A polyester thermoplastic elastomer

An elastomer and polyester-based technology, applied in the field of thermoplastic polyurethane elastomers, can solve the problems of easy precipitation molding speed and transparency, low surface, difficult to balance, etc., to achieve excellent transparency and molding speed, low precipitation performance effect

Active Publication Date: 2022-05-03
ZHEJIANG HUAFENG THERMOPLASTIC POLYURETHANE
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Technical problem: In view of the technical problems that the current thermoplastic polyurethane material is easy to precipitate and the molding speed and transparency are difficult to balance, the purpose of the present invention is to provide a polyester thermoplastic elastomer. The thermoplastic polyurethane obtained by the method of the present invention can be extruded, injection molded and other methods to quickly obtain molded products with high transparency and low precipitation on the surface

Method used

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Embodiment Construction

[0022] Polyester type thermoplastic polyurethane elastomer of the present invention comprises the following raw material components: 20 to 35 wt polyisocyanate, 50 to 75 wt polyester polyol, 2 to 10 wt chain expander;

[0023] Polyester type thermoplastic polyurethane elastomer further comprises 0.01 to 0.5% lubricant, based on the total mass of the obtained thermoplastic polyurethane elastomer to calculate;

[0024] The polyisocyanate is selected from diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), naphthalene diisocyanate (NDI), benzenedimethylene diisocyanate (XDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate (HMDI) and one or more of its isomers;

[0025] In some embodiments of the present invention, polyisocyanate preferably 2,2'-diphenylmethane diisocyanate (2,2'-MDI), 2,4'-diphenylmethane diisocyanate (2,4'-MDI), 4,4'-diphenylmethane diisocyanate (4,4'-MDI);

[0026] By way of example, the polyisocyanate...

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Abstract

The invention relates to a polyester thermoplastic polyurethane elastomer, which comprises the following raw material components: 20-35 parts by weight of polyisocyanate, 50-75 parts by weight of polyester polyol, and 2-10 parts by weight of chain extender. The thermoplastic polyurethane obtained by adopting the method of the invention can be extruded, injected, and the like to quickly obtain a molded product with high transparency and low precipitation on the surface. Two different aliphatic small molecule diols A and diol B are polycondensed with straight-chain aliphatic small molecule diols to obtain polyester polyols, and cooperate with specific carbon atom chain extenders and polyisocyanates , the finally obtained polyester thermoplastic polyurethane elastomer exhibits obvious low precipitation performance. In addition, even if small molecule additives such as lubricants and additives are added to the material, the product of the present invention is still not prone to precipitation. More importantly, the product processed from the product of the present invention has excellent transparency and molding speed.

Description

Technical field [0001] The present invention relates to a thermoplastic polyurethane elastomer, specifically to a low precipitation and taking into account the rapid prototyping and high transparency of thermoplastic polyurethane elastomer. Background [0002] Thermoplastic polyurethane elastomer materials using injection molding, extrusion and other processing methods, its processing temperature usually needs to be higher than the melting temperature of thermoplastic polyurethane (about 200 ° C), in the molding process, due to the nature of the material itself, thermoplastic polyurethane is easy to adhere to the mold is difficult to release from the mold. On the one hand, in order to improve the release of the mold, lubricants, mold release agents and other additives are usually added to the thermoplastic polyurethane, but these additives can easily lead to serious precipitation on the surface of the product; on the other hand, in addition to the additives will cause the surfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/32
CPCC08G18/7671C08G18/664C08G18/4238C08G18/3206
Inventor 马肥陈斌谭华锋杨鹏洲邹勇施龙敏李俊江陈光静
Owner ZHEJIANG HUAFENG THERMOPLASTIC POLYURETHANE
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