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Polyurethane resin used for high-density nubuck and preparation method thereof

A polyurethane resin, high-density technology, used in textiles and papermaking, etc., can solve the problem of no hydrolysis resistance and high peel strength, polyurethane nubuck resin color development and cashmere feeling are not satisfactory, and limit the development of high-end products. and other problems, to achieve the effect of good color development, fast and uniform solidification speed, and high peel strength

Inactive Publication Date: 2017-03-22
ZHEJIANG HUAFON SYNTHETIC RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as people's requirements for product performance are increasing, polyurethane nubuck resins are gradually exposed to performance deficiencies. When the requirements for hydrolysis resistance and mechanical strength are higher, the color development and cashmere feel of polyurethane nubuck resin But it is always unsatisfactory, which also seriously limits its development momentum to high-end products
CN101050265 patent discloses a wet-type soft polyurethane resin for synthetic leather and its preparation method, which only involves the color development and cashmere feeling of ordinary polyurethane nubuck resin, without the characteristics of hydrolysis resistance and high peel strength

Method used

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  • Polyurethane resin used for high-density nubuck and preparation method thereof
  • Polyurethane resin used for high-density nubuck and preparation method thereof
  • Polyurethane resin used for high-density nubuck and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]

[0033] (1) 54.0kg polyadipate-1,6-hexanediol ester diol, 54.0kg polyphthalate propylene glycol ester diol, 64.8kg polycarbonate diol, 7.2kg double-ended hydroxyl polyol Add ether-modified silicone oil, 133.3kg N,N-dimethylformamide and 20.0kg 4,4-diphenylmethane diisocyanate into the reactor for prepolymerization, react at 70°C for 3.0 hours, and measure the viscosity of the reaction liquid to reach 40Pa· s / 70°C, the prepolymerization reaction is over;

[0034] The molar ratio of isocyanate group and hydroxyl group in the reaction liquid is 1:1, and the solid content is 60%.

[0035] (2) Add 23.0kg ethylene glycol and the remaining N,N-dimethylformamide, add the remaining 4,4-diphenylmethane diisocyanate after reacting for 0.5h to carry out the chain growth reaction, and measure the viscosity of the reaction solution to reach 280Pa. s / 25°C, add 1.0kg of methanol for capping, add 5.0kg of polyoxypropylene-oxyethylene diol and 20.0kg of polytetrahydrofuran, stir for...

Embodiment 2

[0037]

[0038]

[0039] (1) 64.0kg polyadipate-1,6-hexanediol ester diol, 40.0kg polyphthalate propylene glycol ester diol, 49.6kg polycarbonate diol, 6.4kg double-ended hydroxyl polyol Add ether-modified silicone oil, 94.4kg N,N-dimethylformamide and 15.3kg 4,4-diphenylmethane diisocyanate into the reactor for prepolymerization, react at 80°C for 2.0 hours, and measure the viscosity of the reaction liquid to reach 30Pa· s / 70°C, the prepolymerization reaction is over;

[0040] The molar ratio of isocyanate group and hydroxyl group in the reaction liquid is 1:1, and the solid content is 65%.

[0041] (2) Add 22.0kg of 1,4-butanediol and the remaining N,N-dimethylformamide, add the remaining 4,4-diphenylmethane diisocyanate after reacting for 1.0h to carry out the chain extension reaction, and measure the viscosity of the reaction solution When it reached 240Pa·s / 25°C, 1.5kg of methanol was added for capping, 7.1kg of polyoxypropylene triol and 16.9kg of polyoxypropylene...

Embodiment 3

[0043]

[0044] (1) 116.0kg polyadipate-1,6-hexanediol ester diol, 40.0kg polyphthalate propylene glycol ester diol, 40.0kg polycarbonate diol, 4.0kg double-ended hydroxyl polyol Add ether-modified silicone oil, 93.1kg N,N-dimethylformamide and 17.2kg 4,4-diphenylmethane diisocyanate into the reactor for prepolymerization, react at 80°C for 2.0 hours, and measure the viscosity of the reaction liquid to reach 20Pa· s / 70°C, the prepolymerization reaction is over;

[0045] The molar ratio of isocyanate group and hydroxyl group in the reaction liquid is 1.09:1, and the solid content is 70%.

[0046] (2) Add 25.0kg of 1,4-butanediol and the remaining N,N-dimethylformamide, add the remaining 4,4-diphenylmethane diisocyanate after reacting for 1.0h for chain extension reaction, and measure the viscosity of the reaction solution When the temperature reached 200 Pa·s / 25°C, 1.8 kg of methanol was added for capping, 19.4 kg of polyoxypropylene triol and 8.6 kg of polyoxypropylene tet...

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Abstract

The invention discloses a polyurethane resin used for high-density nubuck and a preparation method thereof. The polyurethane resin used for high-density nubuck is prepared from, by weight, 5.0%-20.0% of diisocyanate, 10.0%-25.0% of polyester polyol, 1.0%-5.0% of chain extender, 60.0%-75.0% of solvent, 0.1%-0.3% of methyl alcohol and 2.0%-5.0% of accessory ingredient. The polyester polyol is a mixture of poly(1,6-hexanediol adipate) dihydric alcohol, poly dimethyl phthalate-propylene glycol ester dihydric alcohol, poly polycarbonatediol and dihydroxy-terminal polyether modified silicone oil. According to the polyurethane resin used for high-density nubuck and the preparation method thereof, the problems of hydrolysis resistance and peel strength and giving consideration to color contrast property and velvet feel property of high-density nubuck are solved. The prepared synthetic leather is good in hydrolysis resistance performance. The surface of the synthetic leather is not chalked, peel resistance strength attenuates less than 10% after the synthetic leather is soaked in 10% NaOH solution at 25 DEG C for 24 hours, color contrast property is good, and velvet feel is strong. The method has the advantages of being fast and even in solidification rate when used for preparing nubuck, easy for vertical finger-shaped bubble holes to form, good in moisture-penetrability, strong in surface velvet feel after buffed, good in color contrast property, high in hydrolysis resistance and peel strength and the like.

Description

technical field [0001] The invention relates to a wet-process polyurethane resin for synthetic leather and a preparation method, in particular to a polyurethane resin for high-density nubuck leather and a preparation method. Background technique [0002] As the polyurethane synthetic leather market matures and my country's economy develops rapidly, people have higher and higher requirements for the quality and variety of polyurethane synthetic leather products. Nubuck leather, also known as suede or buffed leather, is generally made of soft, hygroscopic polyurethane resin and special non-woven or woven fabrics. High-density nubuck leather must be prepared with a special non-woven fabric. In the wet process, the high-density impregnated resin is used to impregnate the base fabric, and then the nubuck leather is coated with polyurethane in the base fabric by one-sided coating. Form a continuous elastic body containing countless micropores, and then grind off the surface dense...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/42C08G18/44C08G18/61C08G18/12C08G18/32C08G18/48D06N3/14
CPCC08G18/7614C08G18/12C08G18/4009C08G18/4211C08G18/4238C08G18/44C08G18/4804C08G18/4816C08G18/4829C08G18/485C08G18/4854C08G18/61D06N3/147D06N2211/28C08G18/3206C08G18/48
Inventor 杨信实张初银吴晓敏蔡文武彭峰孙凡
Owner ZHEJIANG HUAFON SYNTHETIC RESIN
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