High-entropy polyurethane and preparation method thereof

A polyurethane and polyurethane prepolymer technology, applied in the field of polymer materials, can solve the problems of low tear resistance and tensile strength, poor low temperature resistance of ordinary polyurethane, etc.

Inactive Publication Date: 2020-09-01
扬州雷应精密科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some special use environments, high-entropy polyurethane materials need to have special performance requirements, such as low-temperature resistance. It is required that the prepared high-entropy polyurethane has better low-temperature flexibility, that is, it can still exhibit the high-elastic state of high-entropy polyurethane under low-temperature environments, but its minimum tear resistance and tensile strength cannot meet certain requirements. For applications requiring higher mechanical properties, high-entropy polyurethane has high tear resistance and tensile strength, but ordinary polyurethane has poor low temperature resistance, which limits its application in low temperature environments

Method used

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  • High-entropy polyurethane and preparation method thereof
  • High-entropy polyurethane and preparation method thereof
  • High-entropy polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0032] This embodiment provides a high-entropy polyurethane, which is prepared by reacting a polyurethane prepolymer with a chain extender. The raw materials for preparing the polyurethane prepolymer include the following components in weight percentage: polyester polyol 50.0%, diisocyanate 35.0%, plasticizer 15.0%, among which, polyester polyol is polyester diol PE4020 with a number average molecular weight of 3000, prepared from adipic acid and 1,4-butanediol, diisocyanate Including 4,4'-diphenylphenylmethane diisocyanate 30% and carbodiimide modified MDI (liquefied MDI) 5%, plasticizer is butyl benzyl phthalate (BBP), chain extender The agent is 1,4-butanediol.

[0033] The preparation method of this high entropy polyurethane comprises the following steps:

[0034] (1) React polyester polyol, diisocyanate and plasticizer at a temperature of 80° C. for 2 hours, remove air bubbles under vacuum to obtain a polyurethane prepolymer with an isocyanate content of 5.6%; wherein, d...

Embodiment 2

[0037] This embodiment provides a high-entropy polyurethane, which is prepared by reacting a polyurethane prepolymer with a chain extender. The raw materials for preparing the polyurethane prepolymer include the following components in weight percentage: polyester polyol 63.0%, 32.0% diisocyanate, 5.0% plasticizer, wherein the polyester polyol is polyester diol PE2420 with a number average molecular weight of 3200, prepared from adipic acid, ethylene glycol, and 1,4-butanediol into, wherein the mass ratio of ethylene glycol and 1,4-butanediol is 3:1, diisocyanates include 4,4'-diphenylphenylmethane diisocyanate 28% and carbodiimide modified MDI (liquefied MDI) 5%, the plasticizer is dimethoxyethyl phthalate (DMEP), and the chain extender is a mixture of 1,4-butanediol and trimethylolpropane with a mass ratio of 5:1.

[0038] The preparation method of this high entropy polyurethane comprises the following steps:

[0039] (1) React polyester polyol, diisocyanate and plasticizer...

Embodiment 3

[0042] This embodiment provides a high-entropy polyurethane, which is prepared by reacting a polyurethane prepolymer with a chain extender. The raw materials for preparing the polyurethane prepolymer include the following components in weight percentage: polyester polyol 38%, 37% diisocyanate, 25.0% plasticizer, among which, polyester polyol is polyester diol PE 2420 with a number average molecular weight of 3000, prepared from adipic acid, ethylene glycol, and 1,4-butanediol Formed, wherein the mass ratio of ethylene glycol and 1,4-butanediol is 3:1, the diisocyanate includes 4,4'-diphenylphenylmethane diisocyanate 32% and carbodiimide modified MDI ( Liquefied MDI) 5%, the plasticizer is 9-88SG, and the chain extender is a mixture of 1,4-butanediol and trimethylolpropane with a mass ratio of 20:3.

[0043] The preparation method of this high entropy polyurethane comprises the following steps:

[0044] (1) React polyester polyol, diisocyanate and plasticizer at a temperature ...

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Abstract

The invention discloses high-entropy polyurethane and a preparation method thereof. The high-entropy polyurethane is prepared by reacting a polyurethane prepolymer with a chain extender, and the raw materials for preparing the polyurethane prepolymer comprise the following components in percentage by weight: 38.0%-63.0% of a polyester polyol, 32.0%-37.0% of a diisocyanate and 5.0%-25.0% of a plasticizer. The high-entropy polyurethane prepared by the invention not only has higher mechanical property, but also can reach lower glass-transition temperature, is extremely insensitive to temperature,and can be suitable for regions with variable climates.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-entropy polyurethane and a preparation method thereof. Background technique [0002] High entropy polyurethane (High entropyPU) has a unique long-chain and short-chain hybrid long-short chain structure, which makes it have excellent comprehensive mechanical properties, including excellent mechanical properties, wear resistance, oil resistance, and aging resistance. The hardness can be adjusted in a large range, and these excellent comprehensive properties are not available in many other rubbers and plastics. However, in some special use environments, high-entropy polyurethane materials need to have special performance requirements, such as low-temperature resistance. It is required that the prepared high-entropy polyurethane has better low-temperature flexibility, that is, it can still exhibit the high-elastic state of high-entropy polyurethane under low-tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/10C08K5/12
CPCC08G18/10C08G18/3206C08G18/4238C08G18/664C08G18/6644C08K5/12
Inventor 姜郑林俊铭张皓谢蕾姚婷王泰兴杭韫王天天吴嘉慧于飞汪俊豪苟腾龙
Owner 扬州雷应精密科技有限公司
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