A kind of thermally crosslinked thermoplastic polyurethane elastomer and its preparation method and application

A polyurethane elastomer and polyurethane elasticity technology are applied in the field of thermally cross-linked thermoplastic polyurethane elastomer and its preparation to achieve the effects of oil resistance and a wide range of hardness

Active Publication Date: 2021-01-26
GUANGZHOU MECHANICAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing butadiene rubber, butadiene-type TPU, butadiene-type CPU and other types of polyurethane products have no relevant reports on the application of low temperature, high temperature, oil medium and other conditions at the same time.

Method used

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  • A kind of thermally crosslinked thermoplastic polyurethane elastomer and its preparation method and application
  • A kind of thermally crosslinked thermoplastic polyurethane elastomer and its preparation method and application
  • A kind of thermally crosslinked thermoplastic polyurethane elastomer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: heat-crosslinked thermoplastic polyurethane elastomer and preparation method thereof

[0045] (1) Dehydrate 2000.00g (Mn=2000, functionality 2.03) hydroxyl-terminated butadiene rubber in vacuum at 80°C for 2 hours, then cool down to 40°C, add 349.72g of p-phenylene diisocyanate, stir rapidly to make p-phenylene diisocyanate Dissolve in hydroxyl-terminated butadiene rubber, control the temperature at 40°C, react for 6 hours, then add 5.00 g of dicumyl bis-tert-butyl peroxide and mix evenly to obtain component A of the prepolymer;

[0046] (2) Tere-phenylenedimethanol was heated to 122°C, and dehydrated in vacuum for 1 hour to obtain component B;

[0047] (3) Heat component A to 113°C and component B to 122°C, quickly add 151.98g of component B to component A and stir at 200 rpm, mix well, carry out chain extension reaction, and mature for one stage , the curing condition is 100°C for 16 hours, and the curing process uses N 2 Protection to obtain heat-cros...

Embodiment 2

[0049] Embodiment 2: thermally cross-linked thermoplastic polyurethane elastomer and preparation method thereof

[0050] (1) Dehydrate 2000.00g (Mn=2000, functionality 2.03) hydroxyl-terminated butadiene rubber in vacuum at 85°C for 2 hours, then cool down to 50°C, add 499.61g of p-phenylene diisocyanate, stir rapidly to make p-phenylene diisocyanate Dissolve in hydroxyl-terminated butadiene rubber, control the temperature at 40°C, react for 6 hours, then add 4.00g of dicumyl bis-tert-butyl peroxide and mix evenly to obtain component A of the prepolymer;

[0051] (2) Tere-phenylenedimethanol was heated to 125°C, and vacuum dehydrated for 1.5 hours to obtain component B;

[0052] (3) Heat component A to 115°C and component B to 125°C, quickly add 276.32g of component B to component A and stir at 400 rpm, mix well, carry out chain extension reaction, and mature for one stage , the curing condition is 110°C for 20 hours, and the curing process uses N 2 Protection to obtain heat...

Embodiment 3

[0054] Embodiment 3: heat-crosslinked thermoplastic polyurethane elastomer and preparation method thereof

[0055] (1) 1000.00g (Mn=2000, functionality 2.03) and 1500.00g (Mn=3000, functionality 2.02) of hydroxyl-terminated butadiene rubber were vacuum dehydrated at 80-90°C for 3 hours, then cooled to 50°C, and 666.14 g of p-phenylene diisocyanate, stir rapidly to dissolve p-phenylene diisocyanate in hydroxyl-terminated butadiene rubber, control the temperature at 50°C, and react for 7 hours, then add 3.00g of di-tert-butyl peroxide and mix evenly to obtain Prepolymer A component;

[0056] (2) Tere-phenylenedimethanol was heated to 126°C, and vacuum dehydrated for 2 hours to obtain component B;

[0057] (3) Heat component A to 115°C and component B to 126°C, quickly add 414.48g of component B to component A and stir at 600 rpm, mix well, carry out chain extension reaction, and mature for one stage , the curing condition is 100°C for 24 hours, and the curing process uses N 2...

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Abstract

The invention belongs to the technical field of high polymer materials and discloses a thermo-crosslinking type thermoplastic polyurethane elastomer, a preparation method and an application thereof. The thermo-crosslinking type thermoplastic polyurethane elastomer comprises the following components by mole fraction: 1.0 part of hydroxy-terminated butadiene rubber, 2.2-8.8 parts of p-phenylenediisocyanate, 1.1-7.5 parts of terephthalyl alcohol and 0.003-0.025 part of diisopropyl ditert-butyl peroxide. The thermo-crosslinking type thermoplastic polyurethane elastomer provided by the invention isprepared according to the following steps: adopting a prepolymer method for preparing a prepolymer from reaction of hydroxy-terminated butadiene rubber and p-phenylenediisocyanate; adding vulcanizingagent diisopropyl ditert-butyl peroxide; mixing the prepolymer containing vulcanizing agent with terephthalyl alcohol, and then curing, thereby acquiring the thermo-crosslinking type thermoplastic polyurethane elastomer. The thermo-crosslinking type thermoplastic polyurethane elastomer provided by the invention has excellent low temperature resistance, high temperature resistance, mechanical properties and oil resistance, and can be used for preparing oil pipes and hydraulic and pneumatic sealing elements.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a heat-crosslinked thermoplastic polyurethane elastomer and its preparation method and application. Background technique [0002] Polyurethane elastomer is a material between rubber and plastic. It has the advantages of wide hardness range, good elasticity, wear resistance, high mechanical strength and oil resistance. Polyurethane materials are usually divided into polyether type and polyester type. Polyether type has excellent low temperature performance, but poor high temperature resistance and oil resistance; polyester polyurethane elastomer has excellent high temperature resistance and oil resistance, but is not resistant to Low temperature, poor elasticity at low temperature; and both types of polyurethane elastomers have the disadvantage of high compression set rate at high temperature. Although butadiene rubber has good low temperature resistance, it usually has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/69C08G18/32
CPCC08G18/3215C08G18/69
Inventor 吴斌黄乐王培杰
Owner GUANGZHOU MECHANICAL ENG RES INST
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