Thermoplastic polyurethane elastomer, referred to as TPU, also known as PU thermoplastic, is a linear block copolymer composed of oligomer glycol soft segments and diisocyanate-chain extender hard segments.
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Polyurethane elastomer is a high-performance elastomer, also known as polyurethane rubber. It is a type of elastic polymer material containing more urethane groups (NHCOO) in the molecular chain.
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In addition to containing a large number of polar urethane groups, polyurethane coatings also contain ester, ether, unsaturated grease double bonds, urea groups, biuret and allophanate groups. Polyurethane raw materials and formulas are diverse. , making polyurethane coatings have excellent performance.
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Development of polyurethane One of the main raw materials of polyurethane resin is isocyanate. Alkyl isocyanate was first prepared by German chemist Wurtz in 1849 by metathesis reaction of alkyl sulfate and potassium cyanate.
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Polyurethane is the reaction product of polyols (including diols) and polyisocyanates (including diisocyanates). The two main raw materials, organic polyisocyanates and oligomer polyols (such as polyether, polyester, etc.), usually account for more than 80% of the weight of polyurethane products (excluding solvents). Although the amount of additives is small, it is also an important raw material for polyurethane materials. The development of main raw materials and additives has promoted the development of new polyurethane materials.
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The most commonly used and consumed raw materials in the polyurethane industry are toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), PAPI (the raw material industry often refers to MDI and PAPI collectively as MDI) and polyether polyols. MDI and TDI are key raw materials for PU products.
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