This document provides information about polyvinyl chloride (PVC), including its structure, properties, processing, applications, and manufacturing of rigid PVC pipes. PVC is a thermoplastic polymer made from vinyl chloride monomer units. It has good mechanical, thermal, electrical, and chemical resistance properties which make it useful for pipes, furniture, medical devices, wires, and other applications. Rigid PVC pipes are produced through an extrusion process where impact modifiers are added to PVC before melting and extruding through a die to form continuous pipe profiles.
PVC, or polyvinyl chloride, is a versatile thermoplastic material produced through the polymerization of ethylene and salt with vinyl chloride. It is synthesized through suspension polymerization where vinyl chloride monomer droplets are formed and polymerized in a reactor at 400-600°C. This produces PVC particles suspended in water that are then processed into a white powder. PVC has a wide range of applications, including use in construction materials, healthcare products like blood bags, electronic cables, automotive components, and sports equipment, due to its weather resistance, versatility between rigid and flexible forms, fire resistance, longevity, energy recovery potential, and recyclability.
Polyvinyl Chloride (PVC) is one of the most widely used plastics globally. It is produced by polymerizing vinyl chloride monomers and used in construction, consumer goods, packaging, electrical, and transportation industries due to its excellent electrical insulation, chemical resistance, and ease of fabrication. Global demand for PVC was 38.5 million tons in 2013 and is projected to reach 53.81 million tons by 2020. Common applications of PVC include films, building materials, sheets, appliances, medical instruments, and more.
This document discusses polyvinyl chloride (PVC), including its formula, properties, applications, production, and toxicity concerns. It notes that PVC is the second largest commodity plastic after polyethylene. PVC has good chemical stability, compatibility with additives, electrical insulation, impact strength, and weather resistance. It is used widely in pipes, siding, flooring, windows, doors, toys, medical devices, cables, and more. However, the document raises concerns about PVC's toxicity, as its production relies on chlorine and many additives that can be harmful if released into the environment.
Plastics are polymeric materials that are lightweight, durable, and resistant to corrosion. They can be molded into various shapes and are used widely in engineering applications. Plastics are classified as thermoplastics, which soften when heated and harden when cooled, and thermoset plastics, which harden permanently after heating. Common plastics are made from polymers of materials like vinyl, polyester, and urethane. Plastics have properties like low weight and resistance to heat and electricity that make them useful for applications in industries like construction, automotive, and electronics manufacturing.
PVC is the third most widely used plastic. It was accidentally discovered in the 19th century when a white solid formed in flasks of vinyl chloride exposed to sunlight. PVC is produced via suspension or emulsion polymerization of vinyl chloride monomer. It has a linear structure and atactic stereochemistry. PVC has applications in pipes, cables, flooring and more due to its low cost, durability and resistance to chemicals and corrosion. However, it has disadvantages like difficulty recycling and sensitivity to heat and UV degradation.
Polyurethane is a polymer composed of organic units joined by carbamate links. It exists as both thermosetting and thermoplastic polymers. Polyurethane is used in applications such as flexible and rigid foams, fibers, elastomers, adhesives, coatings, and plastics. It is traditionally made by reacting a di- or polyisocyanate with a polyol. Polyurethane has properties including hardness, strength, resistance and is used in applications like furniture, appliances, composites, electronics, boats, and packaging due to its insulating and protective abilities. Some fungi are able to biodegrade polyurethane.
Pvc was discovered in the 19th century and developed commercially in the early 20th century. It is made through the polymerization of vinyl chloride, which is synthesized from ethylene. Pvc has a linear structure and is a hard, rigid white solid. It has applications in building materials like pipes and windows, packaging, wire insulation, and automotive and medical products due to its resistance to chemicals, moisture, and fire.
Thermoplastics and thermosetting plastics are the two main types of plastics. Thermoplastics soften when heated and harden when cooled, allowing them to be reshaped and recycled. They have linear polymer chains and weak van der Waals bonds holding them together. Common thermoplastics include polyethylene, polypropylene, PVC, and nylon. Thermosetting plastics form irreversible chemical bonds when heated and hardened, preventing melting and reshaping. They have highly cross-linked polymer chains. Bakelite and fiberglass are examples. Plastics are processed using different methods depending on their type, such as injection molding, extrusion, and blow molding. Additives are often included
PVC, or polyvinyl chloride, is a versatile thermoplastic material produced through the polymerization of ethylene and salt with vinyl chloride. It is synthesized through suspension polymerization where vinyl chloride monomer droplets are formed and polymerized in a reactor at 400-600°C. This produces PVC particles suspended in water that are then processed into a white powder. PVC has a wide range of applications, including use in construction materials, healthcare products like blood bags, electronic cables, automotive components, and sports equipment, due to its weather resistance, versatility between rigid and flexible forms, fire resistance, longevity, energy recovery potential, and recyclability.
Polyvinyl Chloride (PVC) is one of the most widely used plastics globally. It is produced by polymerizing vinyl chloride monomers and used in construction, consumer goods, packaging, electrical, and transportation industries due to its excellent electrical insulation, chemical resistance, and ease of fabrication. Global demand for PVC was 38.5 million tons in 2013 and is projected to reach 53.81 million tons by 2020. Common applications of PVC include films, building materials, sheets, appliances, medical instruments, and more.
This document discusses polyvinyl chloride (PVC), including its formula, properties, applications, production, and toxicity concerns. It notes that PVC is the second largest commodity plastic after polyethylene. PVC has good chemical stability, compatibility with additives, electrical insulation, impact strength, and weather resistance. It is used widely in pipes, siding, flooring, windows, doors, toys, medical devices, cables, and more. However, the document raises concerns about PVC's toxicity, as its production relies on chlorine and many additives that can be harmful if released into the environment.
Plastics are polymeric materials that are lightweight, durable, and resistant to corrosion. They can be molded into various shapes and are used widely in engineering applications. Plastics are classified as thermoplastics, which soften when heated and harden when cooled, and thermoset plastics, which harden permanently after heating. Common plastics are made from polymers of materials like vinyl, polyester, and urethane. Plastics have properties like low weight and resistance to heat and electricity that make them useful for applications in industries like construction, automotive, and electronics manufacturing.
PVC is the third most widely used plastic. It was accidentally discovered in the 19th century when a white solid formed in flasks of vinyl chloride exposed to sunlight. PVC is produced via suspension or emulsion polymerization of vinyl chloride monomer. It has a linear structure and atactic stereochemistry. PVC has applications in pipes, cables, flooring and more due to its low cost, durability and resistance to chemicals and corrosion. However, it has disadvantages like difficulty recycling and sensitivity to heat and UV degradation.
Polyurethane is a polymer composed of organic units joined by carbamate links. It exists as both thermosetting and thermoplastic polymers. Polyurethane is used in applications such as flexible and rigid foams, fibers, elastomers, adhesives, coatings, and plastics. It is traditionally made by reacting a di- or polyisocyanate with a polyol. Polyurethane has properties including hardness, strength, resistance and is used in applications like furniture, appliances, composites, electronics, boats, and packaging due to its insulating and protective abilities. Some fungi are able to biodegrade polyurethane.
Pvc was discovered in the 19th century and developed commercially in the early 20th century. It is made through the polymerization of vinyl chloride, which is synthesized from ethylene. Pvc has a linear structure and is a hard, rigid white solid. It has applications in building materials like pipes and windows, packaging, wire insulation, and automotive and medical products due to its resistance to chemicals, moisture, and fire.
Thermoplastics and thermosetting plastics are the two main types of plastics. Thermoplastics soften when heated and harden when cooled, allowing them to be reshaped and recycled. They have linear polymer chains and weak van der Waals bonds holding them together. Common thermoplastics include polyethylene, polypropylene, PVC, and nylon. Thermosetting plastics form irreversible chemical bonds when heated and hardened, preventing melting and reshaping. They have highly cross-linked polymer chains. Bakelite and fiberglass are examples. Plastics are processed using different methods depending on their type, such as injection molding, extrusion, and blow molding. Additives are often included
This document discusses aromatic polyimides, including their formation from reactions between pyromellitic dianhydride and diamines, their heat resistant and mechanical properties, and applications. Polyimides have excellent heat resistance due to their high thermoxidative stability and modulus of elasticity. They are used as insulators in electronics and aerospace applications like insulation and space suits due to their flexibility, strength, and stability from -269 to 400°C. The document also summarizes recent research partially carbonizing aromatic polyimide films to increase their electrical conductivity for applications.
High density polyethylene (HDPE) is a thermoplastic polymer produced from ethylene monomer. HDPE geomembranes are made from polyethylene resin, carbon black, and additives. Although HDPE is less flexible than LLDPE, it provides higher strength and can withstand higher temperatures. Common uses of HDPE include waterproof membranes for basements, roofs, tunnels, pools, and pond liners. HDPE has high elongation, puncture resistance, tensile strength, and resistance to chemicals, corrosion, and UV light. Properties are tested through methods like tensile testing, MVTR, and peel adhesion tests.
The document discusses compounding, which is the process of intimately mixing ingredients into a homogeneous mass. There are various criteria and factors that influence compounding, including selecting the appropriate polymer and ingredients based on requirements. Additives can be incorporated at different stages, and various mixing methods are used depending on the material properties and production needs, including dry mixing, batch mixing, continuous mixing, and screw extrusion. Key compounding methods include single and twin screw extruders, which efficiently mix ingredients using heating elements and intermeshing screw motions.
This document discusses various types of additives used in polymer processing and their functions. It describes additives like stabilizers, lubricants, plasticizers, fillers, fibers, coupling agents, antistatic agents, slip agents, anti-block agents, nucleating agents, optical brighteners, colorants, anti-aging additives, impact modifiers, flame retardants, blowing agents, and master batches. It provides examples and explains how each additive type alters polymer properties or facilitates processing to achieve the desired characteristics in final products.
The document discusses polyvinyl chloride (PVC), a versatile thermoplastic material obtained from ethylene and salt. PVC is the third most widely used plastic after polyethylene and polypropylene. It is low cost, chemically and biologically resistant, and has good hardness and mechanical properties. Common uses of PVC include pipes, bottles, doors and windows, and electrical insulation. The document outlines the monomer used, polymerization process, properties, common forms (rigid and flexible), processing techniques like extrusion and injection molding, and applications in construction, packaging, automotive and more.
Polyester can be produced through various polymerization techniques such as self-condensation, condensation of polyhydroxy compounds with polybasic acids, ester exchange, and ring opening of lactones. Polyester has properties including susceptibility to hydrolysis, proton acceptor ester groups, and increased flexibility. Unsaturated polyester resins are produced from glycols and diacids and provide sites for cross-linking. Polyethylene terephthalate is a widely used polyester produced through ester exchange and polycondensation. It has applications as fibers, films, and bottles. Other polyesters include polybutylene terephthalate and aromatic polyesters.
Neoprene is a synthetic rubber produced by polymerizing chloroprene. It exhibits good chemical stability and flexibility over a wide temperature range. It is used in many applications such as laptop sleeves, orthopedic braces, electrical insulation, and automotive fan belts. Neoprene is produced via free radical emulsion polymerization of chloroprene, which is initiated using potassium persulfate and can be produced as either closed cell or open cell forms. It was invented in 1930 by DuPont scientists and is used today due to its resistance to degradation, making it suitable for applications like gaskets, hoses, and corrosion-resistant coatings.
PVC is a versatile polymer that is chemically stable, neutral, and non-toxic. It has excellent electrical insulation and weatherproof properties. PVC production uses salt and oil or gas. Today, PVC is the second largest commodity plastic after polyethylene, with worldwide production of around 23 million tonnes in 1997. PVC has a wide variety of uses, including in medical applications, transportation, building and construction, toys, consumer goods, packaging, and art and design. Soft vinyl is commonly used in children's toys, imitation leather, backpacks, rain gear, cables, wallpaper, flooring, and medical devices. The majority of PVC is used in pipes, siding, flooring, windows, doors
Plastic is a general term for synthetic polymers that can be molded into solid objects. The first plastic, Parkesine, was created in 1862 from cellulose. Plastics are made from polymers formed through addition, condensation, or addition polymerization reactions from raw materials like monomers, plasticizers, and fillers. The two main types are thermoplastics, which soften when heated and harden when cooled, and thermoset plastics, which harden permanently after heating. Common plastics include polyethylene, PVC, PVA, and bakelite. Plastics are used widely due to properties like light weight, corrosion resistance, strength, and insulation.
Polypropylene is a thermoplastic polymer used in a wide variety of applications including packaging, textiles, laboratory equipment, and automotive parts. It was first produced in 1954 by an Italian professor and is commonly used today due to its high heat and chemical resistance. It exists in various grades including homopolymers, block copolymers, and random copolymers. Polypropylene is produced through addition polymerization of the monomer propylene and has a density of 0.946 g/cm3 and melting point of 160°C. It can be processed through techniques like extrusion, blow molding, and injection molding.
Polyurethane is a polymer made from organic compounds called isocyanates and polyols. It has many applications due to its versatile properties including flexibility, durability, impact resistance and insulation. Common uses include rigid and flexible foams for insulation and furniture, coatings, adhesives, elastomers and binders. Additives are used to modify properties and include flame retardants, colorants, and bacteriostats. Major applications sectors include construction, automotive, appliances, footwear and renewable energy like wind turbine blades.
This document summarizes key information about polyvinyl chloride (PVC), including its introduction, physical properties, techniques for polymerization, applications, research, and conclusions. PVC is one of the most widely used polymers due to its low cost and variety of properties. It consists of polar molecules attracted by dipole-dipole interactions between chlorine and hydrogen atoms. PVC can be manufactured through suspension, emulsion, or bulk polymerization. It has good strength, chemical resistance, workability, and is self-extinguishing. Common applications include pipes, fittings, cables, flooring, and medical devices. Research indicates coating PVC with iodine-doped titanium dioxide reduces bacterial adhesion and biofilm formation.
TPU is a high molecular weight polymer that is widely used due to its abrasion resistance and flexibility at low temperatures. It exists in various types including polyester TPU, polyether TPU, and polycaprolactone TPU. TPU can be processed through injection molding, extrusion molding, and blowing/compression molding. It has properties like hardness and chemical resistance that make it suitable for a variety of applications. Research is being conducted to improve its properties, such as increasing its storage modulus and toughness through the addition of silver nanowires or graphene nanoplatelets.
Thermosets are polymers that are cross-linked in a 3D network, giving them strength and hardness that is not affected by temperature changes. They undergo an irreversible polymerization reaction when heated and cured into a permanent shape. Some common thermosets include phenolics, melamines, epoxies, and copolymers. Thermosets have good mechanical and chemical properties as well as dimensional stability, making them useful for a variety of applications like pots, pans, flooring, and coatings. However, their production requires high temperature and pressure and they have limited processability once cured.
This document discusses the polymer polysulfone. It provides an introduction to polysulfone, describing its synthesis via polysulfonylation and polyetherification reactions. It discusses the production of major commercial polysulfones by Union Carbide, ICI, and 3M. The properties of polysulfone are summarized, including its high heat resistance, toughness, and chemical resistance. Applications are in electrical components, medical devices, automotive parts, and more due to these desirable properties. The advantages and few limitations of polysulfone are also outlined.
This document discusses various types of additives used in plastics, including their purposes and applications. It describes additives like fillers, antioxidants, heat stabilizers, UV stabilizers, colorants, antistatics, flame retardants, cross-linking agents, blowing agents, lubricants and impact modifiers. Additives are used to improve processing, increase stability, obtain better properties like impact resistance and hardness, control factors like surface tension, reduce costs, and increase flame resistance of plastics. The document provides classifications and examples of different additive types.
Plastic is a synthetic material made from organic polymers that can be molded into various shapes. There are two main types of plastics: thermoplastics and thermoset plastics. Thermoplastics soften when heated and harden when cooled, allowing them to be remolded and recycled. Thermoset plastics harden permanently once molded. Plastics have a variety of applications due to their properties like corrosion resistance, low cost, and ability to be molded into complex shapes. However, they also have weaknesses like low strength and sensitivity to heat and chemicals.
Polyurethane is a light weight, flexible and thermally insulating material with low density. It is produced through the reaction of polyisocyanate with polyol, forming urethane linkages. Polyurethane exists as both a thermoset polymer and thermoplastic. It has considerable physical properties like low density, flexibility, chemical stability, and acts as a thermal or electrical insulator. Major applications include use in building insulation, automobiles, marine boats, refrigerators, furniture, footwear, and adhesives.
POLYMERS : PLASTICS AND THERMOPLASTICSSahil Nagpal
This document provides an overview of plastics and rubber, including their history, key developments, types, properties, manufacturing processes, and recycling. Some of the main points covered include:
- The first man-made plastic was Parkesine created in 1862; major early developments included celluloid, Bakelite, and nylon.
- Thermoplastics can be remelted and remolded, while thermosets chemically decompose when heated.
- Plastics are lightweight, durable, versatile materials but take a long time to decompose without proper disposal and recycling.
Polybutadiene is a synthetic rubber formed from the polymerization of the monomer 1,3-butadiene. It has high resistance to wear and is primarily used in tire manufacturing, consuming around 70% of total production. Another 25% is used to improve the toughness of plastics. Polybutadiene has good flexibility, low temperature properties, wear resistance, and low rolling resistance, making it well-suited for applications like tires, golf balls, hoses, and bridge pads.
Polyvinyl chloride (PVC) is the third most widely produced synthetic plastic polymer. It exists in both rigid and flexible forms. Rigid PVC is used in construction for pipes and windows/doors, while flexible PVC is used in products like flooring, phonograph records, and medical tubing. PVC is produced by polymerizing vinyl chloride monomer and is a versatile material with many applications due to its low cost, chemical resistance, and flame retardant properties. It is commonly used in pipes, wire insulation, siding, and signs.
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfKoolLeisure
This document discusses PVC compounding and provides details on the various ingredients that can be added to PVC to modify its properties. It describes the key ingredients used which include stabilizers to prevent degradation, lubricants to reduce friction during processing, plasticizers to make PVC flexible, fillers to reduce costs and modify properties, pigments to add color, flame retardants for fire resistance, and blowing agents for foaming. The document provides examples of specific materials used for each ingredient type and discusses their effects and applications in PVC products.
This document discusses aromatic polyimides, including their formation from reactions between pyromellitic dianhydride and diamines, their heat resistant and mechanical properties, and applications. Polyimides have excellent heat resistance due to their high thermoxidative stability and modulus of elasticity. They are used as insulators in electronics and aerospace applications like insulation and space suits due to their flexibility, strength, and stability from -269 to 400°C. The document also summarizes recent research partially carbonizing aromatic polyimide films to increase their electrical conductivity for applications.
High density polyethylene (HDPE) is a thermoplastic polymer produced from ethylene monomer. HDPE geomembranes are made from polyethylene resin, carbon black, and additives. Although HDPE is less flexible than LLDPE, it provides higher strength and can withstand higher temperatures. Common uses of HDPE include waterproof membranes for basements, roofs, tunnels, pools, and pond liners. HDPE has high elongation, puncture resistance, tensile strength, and resistance to chemicals, corrosion, and UV light. Properties are tested through methods like tensile testing, MVTR, and peel adhesion tests.
The document discusses compounding, which is the process of intimately mixing ingredients into a homogeneous mass. There are various criteria and factors that influence compounding, including selecting the appropriate polymer and ingredients based on requirements. Additives can be incorporated at different stages, and various mixing methods are used depending on the material properties and production needs, including dry mixing, batch mixing, continuous mixing, and screw extrusion. Key compounding methods include single and twin screw extruders, which efficiently mix ingredients using heating elements and intermeshing screw motions.
This document discusses various types of additives used in polymer processing and their functions. It describes additives like stabilizers, lubricants, plasticizers, fillers, fibers, coupling agents, antistatic agents, slip agents, anti-block agents, nucleating agents, optical brighteners, colorants, anti-aging additives, impact modifiers, flame retardants, blowing agents, and master batches. It provides examples and explains how each additive type alters polymer properties or facilitates processing to achieve the desired characteristics in final products.
The document discusses polyvinyl chloride (PVC), a versatile thermoplastic material obtained from ethylene and salt. PVC is the third most widely used plastic after polyethylene and polypropylene. It is low cost, chemically and biologically resistant, and has good hardness and mechanical properties. Common uses of PVC include pipes, bottles, doors and windows, and electrical insulation. The document outlines the monomer used, polymerization process, properties, common forms (rigid and flexible), processing techniques like extrusion and injection molding, and applications in construction, packaging, automotive and more.
Polyester can be produced through various polymerization techniques such as self-condensation, condensation of polyhydroxy compounds with polybasic acids, ester exchange, and ring opening of lactones. Polyester has properties including susceptibility to hydrolysis, proton acceptor ester groups, and increased flexibility. Unsaturated polyester resins are produced from glycols and diacids and provide sites for cross-linking. Polyethylene terephthalate is a widely used polyester produced through ester exchange and polycondensation. It has applications as fibers, films, and bottles. Other polyesters include polybutylene terephthalate and aromatic polyesters.
Neoprene is a synthetic rubber produced by polymerizing chloroprene. It exhibits good chemical stability and flexibility over a wide temperature range. It is used in many applications such as laptop sleeves, orthopedic braces, electrical insulation, and automotive fan belts. Neoprene is produced via free radical emulsion polymerization of chloroprene, which is initiated using potassium persulfate and can be produced as either closed cell or open cell forms. It was invented in 1930 by DuPont scientists and is used today due to its resistance to degradation, making it suitable for applications like gaskets, hoses, and corrosion-resistant coatings.
PVC is a versatile polymer that is chemically stable, neutral, and non-toxic. It has excellent electrical insulation and weatherproof properties. PVC production uses salt and oil or gas. Today, PVC is the second largest commodity plastic after polyethylene, with worldwide production of around 23 million tonnes in 1997. PVC has a wide variety of uses, including in medical applications, transportation, building and construction, toys, consumer goods, packaging, and art and design. Soft vinyl is commonly used in children's toys, imitation leather, backpacks, rain gear, cables, wallpaper, flooring, and medical devices. The majority of PVC is used in pipes, siding, flooring, windows, doors
Plastic is a general term for synthetic polymers that can be molded into solid objects. The first plastic, Parkesine, was created in 1862 from cellulose. Plastics are made from polymers formed through addition, condensation, or addition polymerization reactions from raw materials like monomers, plasticizers, and fillers. The two main types are thermoplastics, which soften when heated and harden when cooled, and thermoset plastics, which harden permanently after heating. Common plastics include polyethylene, PVC, PVA, and bakelite. Plastics are used widely due to properties like light weight, corrosion resistance, strength, and insulation.
Polypropylene is a thermoplastic polymer used in a wide variety of applications including packaging, textiles, laboratory equipment, and automotive parts. It was first produced in 1954 by an Italian professor and is commonly used today due to its high heat and chemical resistance. It exists in various grades including homopolymers, block copolymers, and random copolymers. Polypropylene is produced through addition polymerization of the monomer propylene and has a density of 0.946 g/cm3 and melting point of 160°C. It can be processed through techniques like extrusion, blow molding, and injection molding.
Polyurethane is a polymer made from organic compounds called isocyanates and polyols. It has many applications due to its versatile properties including flexibility, durability, impact resistance and insulation. Common uses include rigid and flexible foams for insulation and furniture, coatings, adhesives, elastomers and binders. Additives are used to modify properties and include flame retardants, colorants, and bacteriostats. Major applications sectors include construction, automotive, appliances, footwear and renewable energy like wind turbine blades.
This document summarizes key information about polyvinyl chloride (PVC), including its introduction, physical properties, techniques for polymerization, applications, research, and conclusions. PVC is one of the most widely used polymers due to its low cost and variety of properties. It consists of polar molecules attracted by dipole-dipole interactions between chlorine and hydrogen atoms. PVC can be manufactured through suspension, emulsion, or bulk polymerization. It has good strength, chemical resistance, workability, and is self-extinguishing. Common applications include pipes, fittings, cables, flooring, and medical devices. Research indicates coating PVC with iodine-doped titanium dioxide reduces bacterial adhesion and biofilm formation.
TPU is a high molecular weight polymer that is widely used due to its abrasion resistance and flexibility at low temperatures. It exists in various types including polyester TPU, polyether TPU, and polycaprolactone TPU. TPU can be processed through injection molding, extrusion molding, and blowing/compression molding. It has properties like hardness and chemical resistance that make it suitable for a variety of applications. Research is being conducted to improve its properties, such as increasing its storage modulus and toughness through the addition of silver nanowires or graphene nanoplatelets.
Thermosets are polymers that are cross-linked in a 3D network, giving them strength and hardness that is not affected by temperature changes. They undergo an irreversible polymerization reaction when heated and cured into a permanent shape. Some common thermosets include phenolics, melamines, epoxies, and copolymers. Thermosets have good mechanical and chemical properties as well as dimensional stability, making them useful for a variety of applications like pots, pans, flooring, and coatings. However, their production requires high temperature and pressure and they have limited processability once cured.
This document discusses the polymer polysulfone. It provides an introduction to polysulfone, describing its synthesis via polysulfonylation and polyetherification reactions. It discusses the production of major commercial polysulfones by Union Carbide, ICI, and 3M. The properties of polysulfone are summarized, including its high heat resistance, toughness, and chemical resistance. Applications are in electrical components, medical devices, automotive parts, and more due to these desirable properties. The advantages and few limitations of polysulfone are also outlined.
This document discusses various types of additives used in plastics, including their purposes and applications. It describes additives like fillers, antioxidants, heat stabilizers, UV stabilizers, colorants, antistatics, flame retardants, cross-linking agents, blowing agents, lubricants and impact modifiers. Additives are used to improve processing, increase stability, obtain better properties like impact resistance and hardness, control factors like surface tension, reduce costs, and increase flame resistance of plastics. The document provides classifications and examples of different additive types.
Plastic is a synthetic material made from organic polymers that can be molded into various shapes. There are two main types of plastics: thermoplastics and thermoset plastics. Thermoplastics soften when heated and harden when cooled, allowing them to be remolded and recycled. Thermoset plastics harden permanently once molded. Plastics have a variety of applications due to their properties like corrosion resistance, low cost, and ability to be molded into complex shapes. However, they also have weaknesses like low strength and sensitivity to heat and chemicals.
Polyurethane is a light weight, flexible and thermally insulating material with low density. It is produced through the reaction of polyisocyanate with polyol, forming urethane linkages. Polyurethane exists as both a thermoset polymer and thermoplastic. It has considerable physical properties like low density, flexibility, chemical stability, and acts as a thermal or electrical insulator. Major applications include use in building insulation, automobiles, marine boats, refrigerators, furniture, footwear, and adhesives.
POLYMERS : PLASTICS AND THERMOPLASTICSSahil Nagpal
This document provides an overview of plastics and rubber, including their history, key developments, types, properties, manufacturing processes, and recycling. Some of the main points covered include:
- The first man-made plastic was Parkesine created in 1862; major early developments included celluloid, Bakelite, and nylon.
- Thermoplastics can be remelted and remolded, while thermosets chemically decompose when heated.
- Plastics are lightweight, durable, versatile materials but take a long time to decompose without proper disposal and recycling.
Polybutadiene is a synthetic rubber formed from the polymerization of the monomer 1,3-butadiene. It has high resistance to wear and is primarily used in tire manufacturing, consuming around 70% of total production. Another 25% is used to improve the toughness of plastics. Polybutadiene has good flexibility, low temperature properties, wear resistance, and low rolling resistance, making it well-suited for applications like tires, golf balls, hoses, and bridge pads.
Polyvinyl chloride (PVC) is the third most widely produced synthetic plastic polymer. It exists in both rigid and flexible forms. Rigid PVC is used in construction for pipes and windows/doors, while flexible PVC is used in products like flooring, phonograph records, and medical tubing. PVC is produced by polymerizing vinyl chloride monomer and is a versatile material with many applications due to its low cost, chemical resistance, and flame retardant properties. It is commonly used in pipes, wire insulation, siding, and signs.
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfKoolLeisure
This document discusses PVC compounding and provides details on the various ingredients that can be added to PVC to modify its properties. It describes the key ingredients used which include stabilizers to prevent degradation, lubricants to reduce friction during processing, plasticizers to make PVC flexible, fillers to reduce costs and modify properties, pigments to add color, flame retardants for fire resistance, and blowing agents for foaming. The document provides examples of specific materials used for each ingredient type and discusses their effects and applications in PVC products.
PVC Compounding1-NSA WITH DIAGRAMS & FORMULATIONS-1.pdfKoolLeisure
This document discusses PVC compounding and provides details on the various ingredients that can be added to PVC to modify its properties. It describes the key ingredients used which include stabilizers to prevent degradation, lubricants to reduce friction during processing, plasticizers to make PVC flexible, fillers to reduce costs and modify properties, pigments to add color, flame retardants for fire resistance, and blowing agents for foaming. The document provides examples of specific materials used for each ingredient type and discusses their effects and applications in PVC products.
Pvc Pipe manufacturing its procedure , cost & applicationUmair Raza
PVC, or polyvinyl chloride, is the third most widely produced synthetic plastic polymer. It is used in construction for pipes and windows. PVC comes in rigid and flexible forms, with the rigid form used for pipes and the flexible form used for items like wire insulation. PVC is produced by blending the resin with plasticizers and other additives through extrusion. It is a versatile material that is resistant to chemicals, weathering, and flame. Common applications of PVC include pipes, siding, medical products, wire insulation, and automotive components.
Poly Vinyl Chloride (PVC) is an important thermoplastic material that was first invented in 1872. It exists in both rigid and flexible forms. Rigid PVC is used for pipes, doors, and windows, while flexible PVC is used for insulation, plumbing, and signage. PVC is produced through the polymerization of vinyl chloride monomers. It has various physical properties that depend on whether it is rigid or flexible, such as density, thermal conductivity, strength, and resistivity. The majority of PVC is formed through suspension polymerization, while some is formed through emulsion and bulk polymerization. PVC has many applications and is an important recyclable material.
PVC is formed from chlorine produced through electrolysis of salt water and ethylene from oil. This reaction forms ethylene dichloride which is then polymerized to form polyvinyl chloride (PVC) resin. PVC has a variety of uses including pipes, window frames, wire insulation, vinyl records, and more. Nylon 6,6 is formed through condensation polymerization of hexamethylenediamine and adipic acid under pressure and high heat. Nylon 6 is formed by heating caprolactum with water at high temperature. Both are used in textiles, brushes, tires, and other applications requiring strength and durability.
5 POLYMERS manufacture.pptx (a dynamic overview)AdnanA11
The document discusses different types of polymers including urea formaldehyde, phenol formaldehyde, and polyvinyl chloride. It describes the basic polymerization techniques of condensation and addition polymerization. Condensation polymerization produces thermosetting resins while addition polymerization produces thermoplastic resins. The document then provides details on the manufacturing processes for specific polymers, including the preparation of urea-formaldehyde and phenol-formaldehyde resins as well as the production of polyvinyl chloride through suspension polymerization of vinyl chloride monomer.
Polyvinyl chloride (PVC) is a widely used thermoplastic with applications in construction, packaging, wire insulation, and more. It is produced through suspension polymerization of vinyl chloride monomer. Key properties include resistance to chemicals and moisture, as well as being lightweight and inexpensive. PVC requires additives like plasticizers and stabilizers to achieve desired material properties for different applications. Common processing methods for PVC include injection molding, extrusion, and calendaring.
This document discusses polyvinyl chloride (PVC), a widely used thermoplastic polymer. It provides background on the history and development of PVC. The two main types - rigid PVC and flexible PVC - are described in terms of their preparation methods, properties, applications, and limitations. Rigid PVC is prepared via suspension polymerization while flexible PVC is made using emulsion polymerization. Both types are recyclable and offer properties such as durability, flame retardancy and chemical resistance, making PVC a versatile and cost-effective material for various construction and medical applications.
2011-2014 pass out batch from CIPET Lucknow . project work on portable pipe system ,which included pipe types , compounding , processing method , trouble shooting , and testing , .Thank you for watching.
Everything about PVC Pipes, Types and its Manufacturing Process – Plastic4tra...Plastic4trade
Polyvinyl chloride is referred to as PVC. The most common application is in the production of PVC Pipes. Types of PVC are UPVC, CPVC use to make Windows, Doors, and much more.
PVC Pipe Prices are cost-effective and affordable. The original properties of PVC Material can be recycled up to seven times without losing any of them.
To make a PVC Pipe, PVC Pipe Manufacturers collect raw material or powder feed into the PVC twin screw extruder. Later the raw material is the melted and heated to the extended so that it is ready to be in the shape.
Read more: https://www.plastic4trade.com/polymer-blog/pvc-pipes-everything-about-pvc-pipes-types-and-its-manufacturing-process
The document discusses various machines used in the manufacturing of PVC pipes. It describes in-line socketing machines that socket PVC pipes after cutting. It also mentions off-line PVC cutting machines for external threading, and PVC pipe slotting machines that can slot two pipes at a time. In-line printing machines can imprint company logos on PVC pipes. The benefits of PVC pipe manufacturing machines are also summarized.
The document discusses the production of rigid PVC pipes. It provides details on the raw materials, production process, machinery requirements, costs, and profitability analysis. The key steps in production include compounding PVC resin with additives through extrusion, sizing and cutting the pipes. The total capital requirement is estimated at Tk 45 lakhs, with fixed capital of Tk 39 lakhs. Annual sales are projected to be Tk 110 lakhs with a net profit of Tk 79 lakhs giving a 14% return on investment.
Feasibility study on PVC PIPE Manufacturing Plant.Md Ali
The document discusses setting up a PVC pipe manufacturing plant in Bangladesh. It provides details of the market demand, raw materials, manufacturing process, machinery requirements, utility requirements, suitable locations, and financial analysis. The total capital requirement is estimated to be 45 lakh taka, with fixed capital of 39 lakh taka. The annual production capacity is estimated to be 150 metric tons with expected annual sales of 110 lakh taka. A financial analysis shows the project will be profitable with an internal rate of return of over 20%.
its about the pvc (polyvinyl chloride) doors about its properties, advantages and disadvantages with market survey of pvc doors according to indian rupees and in additional i can provide pvc doors plan, elevation and section sheet on request.
This document discusses different types of plastics and provides details on polyvinyl chloride (PVC), unplasticized polyvinyl chloride (UPVC), and fibre reinforced plastic (FRP). It explains that PVC is the third most widely produced plastic polymer and comes in both rigid and flexible forms. UPVC does not contain plasticizers and is used in building applications like window frames. FRP is a composite material made of a polymer matrix reinforced with fibres like glass, carbon, aramid or basalt to provide strength and stiffness. Common types are carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP).
The document discusses polymers and their uses in everyday life. It provides information on different types of polymers like polyethylene, polypropylene, polystyrene, poly(methyl methacrylate), poly(vinyl chloride) and discusses their structures, properties and applications. The document also discusses the synthesis and uses of important polymers.
1) PVC or polyvinyl chloride plastic is made through a process of polymerization where vinyl chloride monomers combine to form long chains called polymers.
2) Pure PVC resin is modified through formulation, which involves adding additives like heat stabilizers, lubricants, fillers and pigments to offset undesirable properties like poor heat stability and weatherability.
3) The end product of formulation is a recipe customized for the intended use, such as window extrusions. JELD-WEN uses a 7 step process of mixing ingredients according to their recipe to create PVC compound.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...PECB
Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
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Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
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Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
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2. Structure
The strongest non-covalent bond after hydrogen bond is dipole-dipole
interaction as in 𝐶 − 𝐶𝑙 in the polyvinyl chloride. The electronegativity
difference between the atoms involved in the polar bond is large and hence
it is weaker than the hydrogen bond.
Polyvinyl chloride often termed as PVC is made from its monomer unit
vinyl chloride (𝐶𝐻2 = 𝐶𝐻𝐶𝑙) which is toxic gas at normal conditions. The
polymerized vinyl chloride which is obtained by catalytic polymerization
is a homopolymer. The homopolymer obtained is brittle, hard and also
difficult to process as the reaction cannot be controlled. PVC has a linear
structure which forms long chains. But homopolymer PVC is not used for
commercial use. So some additives are added to make it copolymer and
also for the ease of reaction.
PVC is classified as amorphous polymer. Crystallinity varies from 5-15%.
Crystallinity increases rapidly if the reaction is taking place below the room
temperature. Branching depends mostly on the reaction temperature. It is
directly proportional to the reaction temperature.1
Both isotactic and syndiotactic formations occur in the PVC. The head to
tail configuration that is carbon atom having pendant Cl atom attaching
with the non-pendant carbon atom of the other monomer is predominant
than head to head and tail to tail bonding.5
(Fig from Polymer science)
2|Page
3. Properties
Polyvinyl chloride is a thermoplastic made of 57% chlorine (industrial
grade salt) and 43% carbon (from oil / gas). Compared to other plastics
PVC has some unique properties which makes it different from others.
Mechanical properties
It has better tensile strength and tensile modulus than other olefin
polymers.
The elastic modulus of rigid PVC range from 1500-3000MPa
whereas for plasticized or soft PVC it is from 1.5-15MPa.
Flexural strength is about 10,500psi whereas compression strength
is about 9500psi. Specific gravity of PVC is 1.4.
Rigid PVC shows less creep.
Chlorine atom which is larger and almost equal to the size of carbon make
the chain to uncoil, rotate, disentangle and deform by viscous flow. Cl atom
is largely attracted by the hydrogen atom in the adjacent chain forming
hydrogen bonding. Due to this PVC is more rigid than other polymers
Thermal properties
PVC is poor conductor of heat and start to decompose at 140℃.
Melting point of PVC is 160℃, thermal expansion coefficient is
5 × 10−5 /℃ and thermal conductivity is 0.14-0.28 W/m°𝐾.
Due to main chain high flexibility the heat distortion or softening
temperature of PVC is less and ranges from 54~80℃.
It is generally fire retardant. When PVC is burnt HCl gas which is
denser than air is produced there by relieving oxygen from the
vicinity which makes it self –extinguishing.
3|Page
4. The glass transition temperature of PVC is about or more than80℃.
This can be varied up to 100℃ depending upon the use such as hot
water pipes.
Electrical properties
PVC have good dielectric constant and so insulating properties
which makes it use for electrical appliances.
Due to large dielectric constant losses of PVC, makes it possible of
high frequency welding.
Dielectric constant varies from 2.7 to 3.1, dielectric strength14KV/mm and volume resistivity is about 10^16 Ohm-cm.
Optical properties
PVC is generally amorphous and so transparent. Rigid PVC
products have high transparency compared to plasticized PVC.
The polar and amorphous nature of PVC makes it have good
adhesion and printing properties.
Refractive index of PVC is 1.54.
Other properties
It has good chemical resistance towards acids, alkalis, salts,
oxidizing solvents. 2
Effect of plasticizers and other additives
PVC before processing into final products is modified or not depending on
the type of application. The unmodified PVC is known as rigid PVC
whereas the modified PVC is called soft or plasticized PVC. The PVC is
modified by adding plasticizers. The plasticized PVC is also called vinyl.
Other additives include heat stabilizers, lubricants, processing aids,
thermal modifiers, UV stabilizers, fillers and flame retardants, biocides,
4|Page
5. blowing agent, smoke suppressors, impact modifiers and color pigments
depending on the applications.
Plasticizers are more like a copolymer than additives. It inherits plastic
properties to the polymer. Commonly used plasticizers include diisononyl
phthalate (DINP), di-2ethylhexyl phthalate (DEHP) and diisodecyl
phthalate (DIDP). Other than phthalates, adipates and trimellitates are also
used for low temperature resistance and heat resistance respectively.
Stabilizers include metal compounds, lead stabilizers, cadmium stabilizers,
organo tin stabilizers, calcium-zinc stabilizers, Barium-zinc stabilizers and
more. Stabilizers mainly protect from thermal degradation. Metal
compounds prevent chain reaction of decomposition of the chain and also
from daylight and weathering. Pb stabilizers are used for excellent
electrical properties and water resistivity, Ca-Zn stabilizers are used for
blood bags, toys and food packaging.7
Applications
For typical applications PVC can be used after it is extruded or molded by
injection molding process or blow molded or other for its final use. Its
intrinsic properties makes vast use in the regular life.
Mechanical properties applications
PVC is extensively used for making pipes which include household
and industrial purposes. It is used for sewage by the municipality.
Its light weight, strong and durable nature makes its use
construction. It is used to make windows, claddings, fittings, roof
ceiling and flooring.
5|Page
6. It is used in light weight furniture like tables, skiing equipment etc.
PVC is used to make clothing which replace leather, latex etc. it is
used to make water proof clothing like rain coats and jackets.
Other applications include making toys, automotive appliances,
balls, pools (paddling) etc.
Electrical purposes
The electrical properties makes it useful for insulating of electrical
cables.
Biodegradable properties applications
Coming to healthcare it plays a vital role. PVC with DEHP (Di2ethylhexylphthalate) is used or making blood bags. It is also used
in heart and lung equipment, catheters and cannulae, surgical gloves,
Inhalation masks, packing for medicines, tubing for nerve flow like
dialysis and urine continence, syringes etc.
PVC is also used in packaging extensively. Packing equipment for
food products, medicines, toiletries, electronic parts and accessories,
tools, toys and bottle sieving, tapes for adhesion. 2
Processing
Specific application: PVC rigid pipes
Polymerization
First the monomer is obtained by
Direct reaction of acetylene with HCl.
𝐶𝐻 ≡ 𝐶𝐻 + 𝐻𝐶𝑙 → 𝐶𝐻2 = 𝐶𝐻𝐶𝑙
6|Page
7. Reaction of ethylene with chlorine.
𝐶𝐻2 = 𝐶𝐻2 + 𝐶𝑙2 → 𝐶𝐻2 = 𝐶𝐻𝐶𝑙
Oxy-chlorination
1
𝑂 + 𝐶𝑙2 + 2𝐶2 𝐻4 → 2𝐶𝐻2 𝐶𝐻𝐶𝑙 + 𝐻2 𝑂
2 2
The obtained vinyl chloride undergoes free radical polymerization to form
its polymerized product poly vinyl chloride.4
𝐻2 𝐶 = 𝐶𝐻𝐶𝑙 + 𝑅 → 𝑅 − 𝐶𝐻 − 𝐶𝐻𝐶𝑙 ∙
𝑅 − 𝐶𝐻 − 𝐶𝐻𝐶𝑙 ∙ +𝐶𝐻 = 𝐶𝐻𝐶𝑙 → 𝑅 − 𝐶𝐻 − 𝐶𝐻𝐶𝑙 − 𝐶𝐻 − 𝐶𝐻𝐶𝑙 ∙
𝑅 − 𝐶𝐻 − 𝐶𝐻𝐶𝑙 − 𝐶𝐻 − 𝐶𝐻𝐶𝑙 ∙ +𝐶𝐻 = 𝐶𝐻𝐶𝑙 → −(−𝐶𝐻 − 𝐶𝐻𝐶𝑙−)n
Processing of PVC
Commercial preparation of
PVC is done by suspension polymerization
mostly. Other processes include emulsion and bulk polymerization which
are used less frequently.
The vinyl chloride monomer generally called as VCM is prepared by
ethylene processed from crude oil and chlorine from rock salt obtained
from sea water. It is generally followed by oxychlorination technique.
Coming to suspension polymerization VCM which is pressurized and
liquefied is fed into the polymerization reactor. The polymerization reactor
7|Page
8. contains water and suspension agents. The reactor is agitated with high
speed so that small droplets of VCM are obtained. Then the initiator is fed
into the reactor in which the reaction takes place under low pressure
at 40℃ − 60℃. PVC is obtained by suspending in water to get particles of
size 50𝜇𝑚 − 200𝜇𝑚 diameter in slurry form. The slurry is then discharged
from the reactor to stripper which separates slurry from the residual
monomer. The VCM which didn’t react or remained is collected through
stripping process and is purified to use it again in the next process.
The separated slurry is sent into the centrifuge where excess water is
removed. The dehydrated slurry is sent into the drier where the white
powdered PVC is obtained. By sieving the white powdered PVC in the
sieve machine particles of the required size is obtained.3
The PVC thus obtained by suspension polymerization is called S-PVC.
About 80% of the PVC is manufactured by suspension polymerization.
The PVC obtained by emulsion polymerization is called P-PVC to
distinguish from S-PVC obtained by suspension. Emulsion polymerization
is used to get finer grades of PVC. The advantage of bulk polymerization
is PVC obtained is free from impurities but heat removal is main problem.5
Manufacturing of rigid PVC pipes
PVC rigid pipes are manufactured by extrusion process. Extrusion is a
process through which plastic is melted and then extruded into required
profiles. This process is only applicable for continuous profiles only. The
obtained continuous profiles are cut to length. Extrusion is used for profiles
like pellets and rods, solid profiles like rods, pipe and tubing, sheets and
extruded flat film, coating of wire and cable, blown films, synthetic fibers
and so on.
8|Page
9. Extrusion
In extrusion process the raw plastic or polymer is fed into the extruder
cylinder or barrel via hopper. The raw material feed may be granules,
powder, some cases additives are also mixed. The cylinder consists of a
screw called as extrusion screw. It is specially designed for the mixing and
forward movement of plastic in the barrel. The extrusion screw turns inside
the barrel which then conveys the forward movement of the plastic into the
heated region. The plastic which is heated by the external source as well as
by the friction developed inside by moving parts melts the plastic. The
screw forwards the molten plastic into a hole and enters into special screen
which filters the contaminants out. The molten plastic then moves into a
die to get required profile. Then the output is cooled by sealed water bath
so that no stresses or holes or collapsing of the profile occurs. Some other
auxiliary equipment is used to pull the extrudate out at a continuous rate.
The plastic obtained after cooling is a continuous profile is cut to length.
After certain time the friction and pressure would be enough to maintain
the temperature inside the barrel. So the heater would be switched off to
avoid energy losses. Extrusion lines can be very long.1
Extrusion Screw (Fig from www.pvc.org)
9|Page
10. PVC pipe extrusion
The rigid PVC is hard and brittle which makes it break easily. So in order
to be less prone to impact modifiers are added. Some of the modifiers used
are methacrylate butadiene styrene terpolymers (MBS), chlorinated
polyethylene (CPE) resins. These are known as impact modifiers. DuPont
Dow Elastomers using hydrocarbon rubbers and chlorinated polyethylene
as impact modifiers claim the following compositions:
a vinyl chloride polymer,
2 to 20 parts by weight of at least one ethylene/alpha-olefin
copolymer per 100 parts vinyl chloride polymer, said
copolymer having a density of 0.858 to 0.91 g/cc and having
a melt index from an I10 value of 0.1 to an I2 value of 10, and
To less than 1 part by weight of at least one randomly
chlorinated polyolefin per 100 parts of vinyl chloride
polymer.6
Other additives such as UV stabilizers which include benzo-phenones are
also added. These are mixed in the hopper in proper ratio and sent into the
extrusion barrel. The die used for the processing of these pipes is called
spider die. This die consists a mandrel which acts an obstruction and allows
the formation of pipe.1
Spider die (Fig from 1)
10 | P a g e
11. The polymer mixture is heated up to 150℃. The plastic is heated in three
blocks of heaters with temperature varying in each block from low to high.
The molten plastic is sent in the die after passing through the filter screen
and then the profile is obtained. The pipe profile should not be disturbed
so that flaws don’t occur. It is cooled in sealed water bath. There is puller
which keeps the output profile even. The pipe is then cut to length by the
cutter and sent to packing.1
Rigid PVC pipes
The rigid pipes commonly produced is PVC pipe-Schedule 40. The
samples are sent to the lab for testing. The hardness is tested by Rockwell
hardness test and the thermal tests, pressure tests are also done. The below
are the specifications of Schedule 40
Outer diameter as much as 0.405 inch to 24 inch.
Thickness may vary from as much as 0.109inch to 0.500inch.
The typical temperature that a rigid pipe will resist is about 140℉.
Pressure varies in between 120psi to 810psi.8
All PVC Schedule 40 pipe shall be manufactured from a Type I, Grade I
Polyvinyl Chloride (PVC) compound with a Cell Classification of 12454
per ASTM D1784.8
The average degree of polymerization of the PVC resin used in the making
of rigid pipes is usually in between 950-850.
After Polyethylene and Polystyrene Polyvinyl chloride is mostly produced
in the world. As per 2007 the amount of PVC produced in the USA and
Canada is about 6426 thousand metric tons which account to $17.7 billion
market.
11 | P a g e
12. References
1. Strong A. Brent (1996), Plastics Materials and Processing 3rd
edition, New Jersey, Pearson Education.
2. Harold A. Sarvetnick (1977), Polyvinyl Chloride, R. E. Krieger
Publication Company.
3. Burgess, R.H (1982), Manufacturing and processing of PVC, New
York, Ed., MacMillan.
4. Coroyannakis Panayotis E, Polymerization of vinyl chloride (1978),
Open Access Dissertations and Thesis, Paper 347.
5. Leonard I. Nass, Charles A. Heiberger (1986), Encyclopedia of PVC
Volume 1, 2nd edition, Markel Dekker, INC.
6. Gary R. Marchand, Mark T. Berard, US patent 6706815 B2.
7. ASM International, Engineering Materials Handbook Vol2
Engineering Plastics.
8. ASTM, Rigid PVC pipes specifications and properties.
12 | P a g e