Calendering grade high temperature resistant thermoplastic polyurethane elastomer and preparation method thereof

Abstract

The invention discloses a thermoplastic polyurethane elastomer of rolling-level and high temperature resistance as well as a preparation method thereof. The thermoplastic polyurethane elastomer of rolling-level comprises components in percentage by weight as follows: 30wt%-43wt% of isocyanate, 39wt%-63wt% of polymer polyols, 4wt%-12wt% of small molecule glycol, 0.5wt%-5wt% of diepoxysiloxane, 0.001wt%-0.1wt% of a catalyst, 0.5wt%-2wt% of PE wax, 0.3wt%-1wt% of an antioxygen and 0wt%-1wt% of a other additive. According to the elastomer, the heat resistance of the TPU is effectively improved andcan be produced at higher operating temperatures, the phenomenon of decomposition and product sticking is not easy appeared.

Description

technical field [0001] The invention relates to a calendering grade plastic polyurethane elastomer and a preparation method thereof, in particular to an epoxy siloxane modified thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] The molecular chain of thermoplastic polyurethane (TPU) elastomer has a linear structure, in which isocyanate and low molecular weight diol constitute the hard segment structure of the TPU molecular chain, and the macromolecular polymer polyol constitutes the soft segment structure. Due to the thermodynamics of the hard segment and the soft segment The incompatibility of TPU will cause microphase separation. It is this structural feature that makes TPU have excellent properties such as high strength, high elongation, and high resilience. The calendering process is to heat TPU to a state close to viscous flow, and form a film product of a certain width through the extrusion and extension of parallel rol...

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Problems solved by technology

Due to the poor temperature resistance of general TPU materials, and the high adhesion between TPU and the roller in the viscous flow state, the phenomenon of sticking to the roller is prone to occur, which is limited in product application.

[0003] Patent CN105860508A discloses a calendered grade TPU blended and modified, adding a certain amount of dihydroxy silicone oil, polyvinyl chloride and lubricants zinc stearate and barium stearate to the raw materials to prepare a non-stick TPU. The addition of too much powdery lubricant will cause the material to precipitate during subsequent use, which will affect the use of the material and reduce its physical properties to a certain extent

[0004] Patent CN103289360A reports adding whale fat wax and long-chain fatty acid salt additives in the TPU melt, the additives can be precipitated from the TPU during the calendering process, and an isolation layer is formed between the TPU melt and the metal roller of the calender, thereby reducing The adhesion between the TPU melt and the metal roller of the calender enables the TPU melt to be completely peeled off from the surface of the metal roller. However, the additive will still adhere to the surface of the TPU film after cooling. When the operating temperature increases, the additive may decompose and cannot be removed from the TPU film. fundamentally solve the problem

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