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Formula used for synthesizing NDI-based polyurethane microcellular elastomer

A technology of microporous elastomer and polyurethane, which is applied in the formulation field of synthetic NDI-based polyurethane microporous elastomer, can solve the problems of reducing the product, reducing the hardness of the finished product, and reducing the temperature resistance, so as to expand the application range, improve the reaction speed, Reduces the effect of endogenous heat

Inactive Publication Date: 2015-01-28
SHANGHAI NDI CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the selection of poly(1,4-butylene adipate) or polyethylene adipate as the main polyhydroxy polymer component will result in a long time for post-curing (usually 15 Hours or more), the hardness index of the finished product is unstable, and there may even be defects such as product scrapping due to high hardness
Although a certain amount of external plasticizer can be added to improve the problem of unstable hardness of the finished product, this method will reduce other properties of the product, such as reducing the hardness of the finished product, reducing temperature resistance, etc.; in addition, adding plasticizer during the use of the product The external plasticizer will inevitably migrate and extract, which will affect the performance and service life of the product to a greater extent

Method used

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  • Formula used for synthesizing NDI-based polyurethane microcellular elastomer
  • Formula used for synthesizing NDI-based polyurethane microcellular elastomer
  • Formula used for synthesizing NDI-based polyurethane microcellular elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1000g of poly(butylene adipate) with an average relative molecular weight of 2000 and 286g of NDI were reacted at 130°C for 1h to obtain a prepolymer with -NCO%=5.64%; the chain extender component was 20g of 1,4- A mixture of butanediol and 51g of 4,4'-bis-sec-butylaminodiphenylmethane; 25g of composite catalyst. The composite catalyst consists of 6 parts of dipropylene glycol, 3 parts of 1,4-diazabicyclo[2.2.2]octane, 7 parts of dibutyltin diacetate, 11 parts of polyethylene glycol monomethyl ether-polylactide A mixture of polymer surfactants.

[0022] First, fully mix the chain extender and compound catalyst, put the mixed components into the low-pressure foaming machine, fully mix the mixed components and prepolymer according to the ratio of isocyanate index equal to 1, and then put the reaction liquid Inject it into a mold at 80-110°C, demould after 20-40 minutes, and then put it in an oven at 110°C for post-aging for 9-10 hours.

[0023] The product prepared acco...

Embodiment 2

[0028] 1000g of polyadipate-neopentyl glycol with an average relative molecular mass of 2000 and 234g of NDI were reacted at 130°C for 1h to obtain a prepolymer of -NCO%=4.2%; the chain extender component contained 20g of 1,4 -The mixture of butanediol, 10g dimethylthiotoluenediamine and 9.25g N-N' di-sec-butyl-p-phenylenediamine; 30g of composite catalyst. The composite catalyst consists of 6 parts of dipropylene glycol, 3 parts of 1,4-diazabicyclo[2.2.2]octane, 4 parts of dibutyltin diacetate, 20 parts of polyethylene glycol monomethyl ether-polylactide A mixture of polymer surfactants.

[0029] First, fully mix the chain extender and compound catalyst, put the mixed components into the low-pressure foaming machine, fully mix the mixed components and the prepolymer according to the ratio of isocyanate index equal to 1, and then pour the reaction liquid Pour it into a mold at 80-110°C, demould after 30-45 minutes, and then put it in an oven at 120°C for post-aging for 9-10 h...

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Abstract

The invention discloses a formula used for synthesizing an NDI-based polyurethane microcellular elastomer. The formula comprises, by weight, 100 parts of prepolymer, 3-5.5 parts of chain extender and 1.9-2.4 parts of compound catalysts. Compared with the prior art, the compound catalysts are adopted to increase reaction speed, and time needed for later curing is shortened. By means of reasonable selection of the formula and balancing of the ratios of components, on the premise that dynamic and static performance is not influenced, the advantages that hardness is low, plasticity is high and internally generated heat is little are kept, and the application range of a product is widened.

Description

technical field [0001] The invention relates to a polyurethane microcellular elastomer, in particular to a formula for synthesizing an NDI-based polyurethane microcellular elastomer. Background technique [0002] Polyurethane is a polymer wear-resistant material between rubber and plastic, with excellent wear resistance, oil resistance, low temperature resistance, hydrolysis resistance and corrosion resistance. [0003] Polyurethane microcellular elastomer is a block polymer composed of soft segments and hard segments alternately. Its excellent dynamic and static mechanical properties and cheap and convenient processing methods determine its importance in the field of industrial applications in my country. Especially suitable for the fields of cushioning, shock absorption and damping. Using different types of raw materials or using different ratios of the same raw materials can produce products with great differences in mechanical properties and processing properties. NDI-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/16C08G18/10C08G101/00
CPCC08G18/664C08G18/10C08G18/165C08G18/168C08G18/2063C08G18/242C08G18/3206C08G18/3243C08G18/4238C08G18/6651C08G2101/00C08G18/32
Inventor 顾晓军其他发明人请求不公开姓名
Owner SHANGHAI NDI CHEM TECH
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