Anti-yellowing thermoplastic polyurethane elastomer and preparation method thereof

A thermoplastic polyurethane and polyurethane elastomer technology, which is applied in the field of rapid prototyping and yellowing-resistant thermoplastic polyurethane elastomer and its preparation, can solve problems such as affecting the appearance and service life of products, polluting the environment of production personnel, and accelerating product aging, and achieves excellent results. Anti-yellowing performance, shortening injection cycle, and the effect of reducing viscosity

Inactive Publication Date: 2018-06-15
清远新力化机有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method can make the plastic polyurethane elastic with low hardness while shortening the injection molding cycle and improving production efficiency, but the added plasticizer volatilizes in a large amount during the processing, polluting the environment and causing harm to the health of production personnel
In addition, plasticizers and lubricants will slowly precipitate over time, which will increase the hardness of the product, and there will be an oil layer on the surface, which will accelerate the aging of the product and affect the appearance and service life of the product
How to ensure that the thermoplastic polyurethane elastomer has the shortest possible injection cycle at 60-75A hardness without adding plasticizers to affect the appearance and life of the product has become a technical problem

Method used

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  • Anti-yellowing thermoplastic polyurethane elastomer and preparation method thereof
  • Anti-yellowing thermoplastic polyurethane elastomer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] A preparation method of an anti-yellowing thermoplastic polyurethane elastomer, comprising the following processes:

[0022] (1) Preparation of the pre-mixture: Add 1kg of polyadipate-1,4-butylene glycol ester diol, 36g of 1,4-butanediol, and ultraviolet absorber into a 2000mL three-necked flask with a stirrer and a thermometer 2-(2'-Hydroxy-3',5'-di-t-pentylphenyl)benzotriazole 5g, bis(2,2,6,6-tetramethyl-4-piperidinol) sebacic acid 2.5g of ester, 2g of antioxidant 1010 and 2g of antioxidant 168 were gradually heated up to 90°C for 30 minutes under vacuum dehydration while stirring to obtain a premixture. The molecular weight of the polyadipate-1,4-butylene glycol ester diol is 3500.

[0023] (2) Rapid prototyping process: under the condition of rapid stirring, add 181 g of measured and pre-melted 4,4'-diphenylmethane diisocyanate and 1 drop of catalyst stannous octoate to the pre-mixture obtained above to make Fully stir the reaction, the reaction temperature is 75 ...

Embodiment 2

[0025] A preparation method of an anti-yellowing thermoplastic polyurethane elastomer, comprising the following processes:

[0026] (1) Preparation of the pre-mixture: Add 1 kg of polyethylene adipate-1,4-butanediol ester diol, 36 g of 1,4-butanediol, UV absorber 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole 5g, bis(2,2,6,6-tetramethyl-4-piperidinol) 2.5g of sebacate, 2g of antioxidant 1010 and 2g of antioxidant 168 were gradually heated up to 90°C for 30 minutes under vacuum dehydration while stirring to obtain a premixture. The polyethylene adipate-1,4-butylene glycol ester diol molecular weight is 3500;

[0027] (2) Rapid prototyping process: under the condition of rapid stirring, add 181 g of measured and pre-melted 4,4'-diphenylmethane diisocyanate and 1 drop of catalyst stannous octoate to the pre-mixture obtained above to make Fully stir the reaction, the reaction temperature is 75 ~ 85 ℃, depending on the high viscosity, it can be poured out in about 2 minutes. A...

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Abstract

The invention discloses an anti-yellowing thermoplastic polyurethane elastomer and a preparation method thereof. The polyurethane elastomer has shore hardness of 60 to 75 A. The polyurethane elastomeris prepared from the following raw materials: polyester glycol, 1,4-butanediol, an anti-ultraviolet absorbent, di(2,2,6,6-tetramethyl-4-pipradrol)sebacic acid ester, 4,4'-diphenylmethane diisocyanate, an antioxidant and a catalyst. According to the anti-yellowing thermoplastic polyurethane elastomer and the preparation method thereof, the shore hardness of the thermoplastic polyurethane elastomeris up to 60 to 75 A, and the injection molding period is effectively shortened, so that a phenomenon of sticking of a mold during processing is avoided. Furthermore, due to addition of the anti-ultraviolet absorbent, the polyurethane elastomer disclosed by the invention is excellent in anti-yellowing property. Moreover, the injection molding period and the intensity of the thermoplastic polyurethane elastomer can be balanced by regulating and controlling the use amount of a catalyst. The preparation method of the polyurethane elastomer is environmentally friendly, economical, high in weatherresistance, high in injection molding speed and high in processing efficiency, and can be widely applied to injection molding of products such as a shoe material, a triangular belt and sheet rubber.

Description

technical field [0001] The invention relates to a plastic polyurethane elastomer and a preparation method thereof, in particular to a rapid-molding anti-yellowing thermoplastic polyurethane elastomer with a Shore hardness of 60-75A and a preparation method thereof. Background technique [0002] The fields where plastic polyurethane elastomers are used are often exposed to sunlight, and the ultraviolet rays in sunlight will accelerate the aging and decomposition of plastic polyurethane elastomers, greatly shortening the service life of the product and changing the color of the product. Moreover, due to the poor compatibility of thermoplastic polyurethane elastomers with most other ray absorbers and light stabilizers, especially low-hardness thermoplastic polyurethane elastomers are prone to oily powder due to poor compatibility with additives , affecting product appearance and performance. [0003] When plastic polyurethane elastomers are used in shoe materials, the hardness...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08L75/06
CPCC08G18/3206C08G18/4238C08G18/664C08L75/06
Inventor 李泽雄谭沛芬徐敏静
Owner 清远新力化机有限公司
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