TPU Modification Research

Thermoplastic polyurethane elastomer (TPU) is usually a block polymer prepared by polyaddition reaction with polymer polyol, diisocyanate, chain extender, crosslinking agent and a small amount of auxiliary agent as raw materials. From the point of view of molecular structure, the main chain of thermoplastic polyurethane macromolecule is composed of soft segment and hard segment. The soft segment is composed of soft polymer polyol, which determines the elasticity and low temperature resistance of the elastomer. Segments are generally formed by the reaction of diisocyanates and chain extenders (low-molecular diols or diamines, etc.), which affect the strength, crystallinity, hardness, modulus and other properties of the elastomer.

Non-polar resin and TPU generally cannot be simply blended, because the two polarities are different, resulting in poor compatibility, so simple blending cannot play a role in modification. Often the non-polar resin is first grafted with small molecular polar groups, and then blended with thermoplastic polyurethane (TPU); there are also non-polar resins and small molecular graft copolymers as non-polar polymers and TPU Compatibilizer, so that the two can be partially compatible and blended. In addition, non-polar resin and TPU are used to form an interpenetrating network structure during the synthesis reaction.

Thermoplastic polyurethane (TPU) and ABS (acrylonitrile-butadiene-styrene graft copolymer) can be blended in any ratio. When TPU and ABS are blended, they have a synergistic effect and obtain the performance of the corresponding components. Meet the needs of different purposes. In the future, various high-performance TPU materials will continue to emerge. The development of high-performance blended gold, flame retardant, antistatic, high thermal stability, hydrolysis resistance, aging resistance, high damping, and biodegradable TPU will be an important development direction.