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Ultralow-hardness polyurethane elastomer and preparation method thereof

A polyurethane elastomer and hardness technology, which is applied in the field of ultra-low hardness polyurethane elastomer and its preparation, can solve problems such as increased hardness of insoles, pollution of footwear, and application restrictions, and achieves easy production, simple formulation, and comfortable hand feeling Effect

Inactive Publication Date: 2011-07-13
CHINA LEATHER & FOOTWEAR IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insoles used for shock absorption are mostly made of low-hardness elastic materials. The usual low-hardness polyurethane elastomers are obtained by adding plasticizers. After a long period of storage, the plasticizers will migrate to the surface of the insole and contaminate the shoes. Socks, the hardness of the insole will also increase, and its application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Component A is diphenylmethane diisocyanate prepolymer; component B is a mixture of 3-functionality molecular weight 7600 polypropylene oxide ether polyol Z-221 and dibutyltin dilaurate, with a mass ratio of 1000:2; Component C is linear monoalcohol D-2000 with a molecular weight of 2000.

[0039] The mass ratio of component A to component B is 1:0.94, 43 grams and 40.3 grams respectively, the mass ratio of component B to component C is 1:0.1, and component C is 4 grams.

[0040] Dehydrate components B and C at 110°C and -0.08MPa for 4 hours, then cool down to 60°C. Heat 43 grams of component A to 60°C, add it to 4 grams of component C, mix well, and react for ten minutes, then add 40.3 grams of component B to the mixture of components A and C, mix quickly, and pour into In the mold cavity, demould for 10 minutes, then aged at 80°C for 4 hours, and then placed at room temperature for 24 hours, the surface is smooth and non-sticky, and the hardness is Shore A 7.

Embodiment 2

[0042] Component A is diphenylmethane diisocyanate MDI-100; component B is 3-functionality molecular weight 7600 polypropylene oxide ether polyol Z-221, 3-functionality molecular weight 10000 polypropylene oxide ether polyol Z-3100 and The mixture of dibutyltin dilaurate and UV-531, the mass ratio is 1000:1000:3:5; C component linear monoalcohol D-2000 with molecular weight of 2000.

[0043] The mass ratio of component A and component B is 1:22.1, 1.81 grams and 40 grams respectively; the mass ratio of component B and component C is 1:0.1, and component C is 4 grams.

[0044] Dehydrate components B and C at 110°C and -0.08MPa for 4 hours, then cool down to 53°C. Heat 1.81 grams of component A to 55°C, add it to 4 grams of component C, mix well, and react for ten minutes, then add 40 grams of component B to the mixture of components A and C, mix quickly, and pour into In the mold cavity at 50°C, demoulding for 20 minutes, then aging at 80°C for 4 hours, and then placed at room...

Embodiment 3

[0046] Component A is diphenylmethane diisocyanate prepolymer; component B is a mixture of 3-functionality molecular weight 7600 polypropylene oxide ether polyol Z-221 and dibutyltin dilaurate and 1010, and its mass ratio is 1000: 2:1.

[0047] The mass ratio of component A to component B is 1:1.9, 31 grams and 60 grams respectively.

[0048] Dehydrate component B at 110°C and -0.08MPa for 4 hours, then cool down to room temperature, take 31 grams of component A, add it to 60 grams of component B, mix quickly and evenly, pour it into a mold at room temperature, cure at room temperature for 2 minutes and demould , the surface is slightly viscous after standing still for 24 hours, and the hardness is Shore A 0, which is equivalent to Shore C 6.

[0049] The ultra-low hardness polyurethane elastomer of the present invention is prepared by reacting diphenylmethane diisocyanate, polyglycidyl ether polyol and monoalcohol. The monoalcohol reacts with isocyanate in the reaction syste...

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Abstract

The invention relates to an ultralow-hardness polyurethane elastomer which comprises three components: a component A is diphenylmethane diisocyanate or a prepolymer thereof, wherein the prepolymer is formed by polymerizing the diphenylmethane diisocyanate and a modifier thereof with polypropylene oxide ether polyol with the functionality of 2-3 and the number-average molecular weight of 1000-8000; a component B consists of polymer polyol, a catalyst and an antiaging agent; and a component C is polymer linear monoalcohol with the number-average molecular weight of 1000-4000. When the component A is the prepolymer, the mass ratio of the component A to the component B is 1:(0.8-1.3). When the component A is the diphenylmethane diisocyanate, the mass ratio of the component A to the component B is 1:(19-27). The mass ratio of the component B to the component C is 1:(0-0.3). The invention also provides a preparation method of the ultralow-hardness polyurethane elastomer material, which is simple to formulate and easy for manufacturing; and the obtained product is environment-friendly and safe, has favorable buffering performance and compression resisting performance, the Shore hardness ranging between 0 and 15, and smooth surface or extremely low viscosity, and is used for manufacturing shoe products for buffering, resisting wearing, and the like.

Description

technical field [0001] The invention relates to a polyurethane elastomer and a preparation method thereof, in particular to an ultra-low hardness polyurethane elastomer and a preparation method thereof. Background technique [0002] Cast polyurethane elastomer is a chemical system that pours liquid reaction mixture into the mold cavity to produce products. It has excellent characteristics such as high mechanical strength, wear resistance, oil resistance, anti-skid, compression resistance, wide hardness range, and good cushioning performance. It is suitable for making shoe parts. . The insoles used for shock absorption are mostly made of low-hardness elastic materials. The usual low-hardness polyurethane elastomers are obtained by adding plasticizers. After a long period of storage, the plasticizers will migrate to the surface of the insole and contaminate the shoes. Socks, the hardness of the insole will also increase, and its application is limited. [0003] Some examples...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08G18/48C08G18/40
Inventor 石飞钟宁庆
Owner CHINA LEATHER & FOOTWEAR IND RES INST
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