Milky fluid from tapped rubber trees called Latex Conversion of latex to solid (Coagulation )
Latex - Colloidal solution containing an aqueous suspension of rubber particles
Coagulation of rubber can be speeded by the addition of acid.
The bacteria present in the latex produces organic acids
The hydrogen ions from the acids produced neutralises the negative charge on the rubber particles.
The bacteria present in the latex produces organic acids
The hydrogen ions from the acids produced neutralises the negative charge on the rubber particles.
The hydroxide from ions from aqueous ammonia neutralise the acids produced by bacteria.
The negative charges at the membranes of rubber particles are maintained
Latex is coagulated by adding a weak acid : methanoic acid and ethanoic acid
When an acid is added to latex, the hydrogen ions from the acid will neutralize the negative charges on the surfaces of the colloidal particles.
The particles become neutral and come closer and collide with one another.
INTRODUCTION
OBJECTIVES
METHOD OF POLYMERIZATION
FLOW DIAGRAM
MODEL OF SUSPENSION POLYMERIZATION
ADVANTAGES
DISADVANTAGES
ADVANCEMENT IN THE FIELD OF SUSPENSION POLYMERIZATION
CONCLUSION
Butyl rubber (IIR), also called isobutylene-isoprene rubber, a synthetic rubber produced by copolymerizing isobutylene with small amounts of isoprene. Valued for its chemical inertness, impermeability to gases, and weather ability, butyl rubber is employed in the inner linings of automobile tires and in other specialty applications.
INTRODUCTION
OBJECTIVES
METHOD OF POLYMERIZATION
FLOW DIAGRAM
MODEL OF SUSPENSION POLYMERIZATION
ADVANTAGES
DISADVANTAGES
ADVANCEMENT IN THE FIELD OF SUSPENSION POLYMERIZATION
CONCLUSION
Butyl rubber (IIR), also called isobutylene-isoprene rubber, a synthetic rubber produced by copolymerizing isobutylene with small amounts of isoprene. Valued for its chemical inertness, impermeability to gases, and weather ability, butyl rubber is employed in the inner linings of automobile tires and in other specialty applications.
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The presentation describes about the butyl rubber about its properties, compounding, categories, applications, new innovations, advantages and disadvantages. The references are added at the end
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Introduction, types, raw material, reaction mechanism, manufacturing process, flow sheet of production process, properties, applications, industries in India, commercial name
This document gives a brief description on defoamer chemicals used in industry. Foaming is a problem in processing industry like, food, paper and pulp, paint and coating, printing, dyeing, oil drilling, boiler steam production, water treatment, waste management, etc.
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2. COAGULATION OF LATEX
Milky fluid from tapped rubber trees called Latex Conversion of latex to
solid (Coagulation )
Latex - Colloidal solution containing an aqueous suspension of rubber
particles
Coagulation of rubber can be speeded by the addition of acid.
3. THE COAGULATION OF LATEX CAN OCCUR WITHOUT THE ADDITION OF ACID IF THE
LATEX IS EXPOSED TO AIR FOR A FEW DAYS .THIS IS BECAUSE :
a) The bacteria present in the latex produces organic acids
b) The hydrogen ions from the acids produced neutralises the negative
charge on the rubber particles.
4. COAGULATION OF LATEX CAN BE
PREVENTED BY THE ADDITION OF
AQUEOUS AMMONIA BECAUSE
a)
The hydroxide from ions from aqueous ammonia neutralise the acids
produced by bacteria.
b)
The negative charges at the membranes of rubber particles are
maintained
5. Coagulation of
latex
Add a weak
acid
•
•
•
Latex is coagulated by
adding a weak acid :
methanoic acid and ethanoic
acid
When an acid is added to
latex, the hydrogen ions
from the acid will neutralize
the negative charges on the
surfaces of the colloidal
particles.
The particles become
neutral and come closer and
collide with one another.
•
The collisions between
the latex particles break
open the protein
membrane and releases
the rubber polymers
•
•
The rubber polymers can
coalesce (combine) and
form lumps of rubber (
coagulation of latex)
The lumps of rubber are
white solids and are quite
elastic
