Polyurethane

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Polyurethane

  1. 1. POLYURETHANEPOLYURETHANEMaterials ScienceMaterials Science
  2. 2. What is Polyurethane?What is Polyurethane? A type of elastomer which is capable ofA type of elastomer which is capable ofexperiencing large and reversible elasticexperiencing large and reversible elasticdeformations.deformations. It’s amorphous, having molecular chainsIt’s amorphous, having molecular chainsthat are naturally coiled and kinked in itsthat are naturally coiled and kinked in itsunstressed state.unstressed state.
  3. 3. Who Invented it?Who Invented it? The underlying chemistry behindThe underlying chemistry behindpolyurethane was first developedpolyurethane was first developedbyby Professor Dr. Otto BayerProfessor Dr. Otto Bayer (1902-(1902-1982).1982). He invented the DiisocyanateHe invented the DiisocyanatePolyaddition Process which is thePolyaddition Process which is thebase patent in the polyurethanebase patent in the polyurethaneindustry.industry.
  4. 4. What is the DiisocyanateWhat is the DiisocyanatePolyaddition Process ?Polyaddition Process ? Polyurethanes are formed by reacting a polyolPolyurethanes are formed by reacting a polyol(an alcohol with more than two reactive hydroxyl(an alcohol with more than two reactive hydroxylgroups per molecule) with a diisocyanate or agroups per molecule) with a diisocyanate or apolymeric isocyanate in the presence of suitablepolymeric isocyanate in the presence of suitablecatalysts and additives.catalysts and additives. Since a multitude of different diisocyanates andSince a multitude of different diisocyanates andpolyols can be used to produce polyurethane, apolyols can be used to produce polyurethane, abroad range of polyurethanesbroad range of polyurethanes can becan bemanufactured to meet the requirements formanufactured to meet the requirements forspecific applications.specific applications.
  5. 5. The Forms of PolyurethaneThe Forms of PolyurethaneFLEXIBLE – Solid &FoamsREBOND - FoamsRIGID – Resins(Table-topcovers, furnitureprotection, etc)
  6. 6. Where is Polyurethane Used?Where is Polyurethane Used?Polyurethane-based binders are used in compositewood products to permanently glue organic materials intooriented strand board, medium-density fiberboard, longstrand lumber, laminated veneer lumber, strawboard andparticleboard.Polyurethane-based sealants are used in joints andopenings to help prevent the passage of gases, liquids,and solids (dust and dirt). Similarly, polyurethane-basedadhesives are used to bond wall and ceiling panels to thestructural frame, and floor joists to the sub-floor decking.Bonded polyurethane carpet cushion which is madewith re-used flexible polyurethane foam (FPF). With theability to be recycled and its high recycle content,bonded carpet cushion creates a valuable use for amaterial that would otherwise require disposal.
  7. 7. Where is Polyurethane Used?Where is Polyurethane Used?Polyurethane-based binders are used in compositewood products to permanently glue organic materials intooriented strand board, medium-density fiberboard, longstrand lumber, laminated veneer lumber, strawboard andparticleboard.Polyurethane-based sealants are used in joints andopenings to help prevent the passage of gases, liquids,and solids (dust and dirt). Similarly, polyurethane-basedadhesives are used to bond wall and ceiling panels to thestructural frame, and floor joists to the sub-floor decking.Bonded polyurethane carpet cushion which is madewith re-used flexible polyurethane foam (FPF). With theability to be recycled and its high recycle content,bonded carpet cushion creates a valuable use for amaterial that would otherwise require disposal.

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