Synthetic Method Of Thermoplastic TPU Material

Thermoplastic polyurethane elastomer (TPU) is a kind of elastomer that can be plasticized by heating and can be dissolved by solvent. It has excellent comprehensive properties such as high strength, high toughness, wear resistance, and oil resistance. It has good processing performance and is widely used in national defense, medical treatment, Food and other industries.

The outstanding features of polyurethane thermoplastic elastomers are excellent wear resistance, excellent ozone resistance, high hardness, high strength, good elasticity, low temperature resistance, good oil resistance, chemical resistance and environmental resistance. The hydrolytic stability of type ester is much higher than that of polyester type.

The synthesis method of TPU can be divided into two categories according to the presence or absence of solvent: solvent-free bulk polymerization method and solvent-containing solution polymerization method. Bulk polymerization can be divided into one-step method and prepolymer method according to the reaction steps. The one-step method is to simultaneously mix the oligomer diol, diisocyanate and chain extender. The one-step process is simple and easy to operate, but the heat of reaction is difficult to remove and side reactions are likely to occur. Polyester-type thermoplastic polyurethane elastomer was synthesized by one-step method. Firstly, the formula amount of polyester polyol and chain extender, butanediol was weighed in the reactor, and the temperature was raised to 120°C for vacuum dehydration. Quickly add the preheated liquid and stir evenly, pour it into the preheated container, bake it under vacuum at 120°C, then lower the temperature to 100°C to get a light yellow translucent polyurethane product, and then press it on a flat press to form a test piece , the prepared TPU has high mechanical properties and damping properties.

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