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Polyester high-hydrolysis resistance and high-peeling strength polyurethane resin for wet-method synthetic leather and preparation method thereof

A polyurethane resin, polyester technology, used in textiles and paper, fiber processing and other directions

Active Publication Date: 2010-10-06
ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of the opposition between the hydrolysis resistance and the peel strength of the impregnated polyurethane resin for wet-process synthetic leather

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The polyester type high hydrolysis resistance and high stripping polyurethane resin for wet-process synthetic leather of the present invention is prepared according to the following steps:

[0031] 1. According to the above formula, put polycaprolactone diol, anhydride polyester polyol and antioxidant into the reaction kettle, heat up to 50-80°C to melt; after stirring evenly, heat up to 80-120°C, vacuum remove water 1.5h, cool down to below 50°C;

[0032] 2. Put in N,N-dimethylformamide, stir for 10 minutes, then put in phosphoric acid, stir for 20 minutes; the temperature of the kettle is controlled at 40-60°C;

[0033] 3. Add 4,4′-diphenylmethane diisocyanate in batches, react at 60-100°C for 2 hours, and control the final viscosity of the system at 5000-20000cps / 25°C;

[0034] 4. Add the chain extender 1,4-butanediol, stir evenly, add the remaining 4,4'-diphenylmethane diisocyanate, and react for another 2 hours, control the final viscosity of the system at 50000...

Embodiment 2

[0038] The polyester type high hydrolysis resistance and high stripping polyurethane resin for wet-process synthetic leather of the present invention is prepared according to the following steps:

[0039] 1. Put polycaprolactone diol, polycarbonate polyol, polyphthalic anhydride polyol, and antioxidant into the reaction kettle according to the above formula, heat up to 50-80°C to melt; after stirring evenly, heat up to 80-120°C , remove water under vacuum for 1.5h, and cool down to below 50°C;

[0040] 2. Put in N,N-dimethylformamide, stir for 10 minutes, put in stannous octoate, and stir for 20 minutes;

[0041] 3. Add 4,4′-diphenylmethane diisocyanate in batches, react at 60-100°C for 2 hours, and control the final viscosity of the system at 5000-20000cps / 25°C;

[0042] 4. Add the chain extender 1,4-butanediol, stir evenly, add the remaining 4,4'-diphenylmethane diisocyanate, and react for another 2 hours, control the final viscosity of the system at 50000-200000cps / 25℃; ...

Embodiment 3

[0045] In order to verify the high hydrolysis resistance and high peeling properties of the high hydrolysis resistance and high peeling polyurethane resin of the present invention, the resin prepared in the above-mentioned implementation cases is made into synthetic leather according to the following wet process leather processing formula, and the specific preparation The leather recipe is as follows:

[0046] raw material name

[0047] After testing, the polyurethane synthetic leather made with the above formula has soft hand feeling, high porosity, and excellent hydrolysis resistance. After soaking in 10% sodium hydroxide solution for 24 hours, the tensile strength of the above polyurethane synthetic leather can maintain 70% Above, at the same time, the peel strength is greater than 60N / 3cm, which can meet the product design requirements.

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Abstract

The invention relates to an esterified polyurethane resin for wet-method synthetic leather, in particular to the polyester high-hydrolysis resistance and high-peeling strength polyurethane resin for the single-component wet-method synthetic leather and a preparation method thereof. The polyurethane resin is prepared from the following components in weight percentage: 2%-15% of isocyanate, 20%-30% of polyester polyol compound, 0%-5% of dihydric alcohol chain extender, 0.01%-0.5% of catalyst, 0.01%-0.5% of additive and 50%-80% of water-soluble organic solvent. The high-hydrolysis resistance and high-peeling strength polyurethane resin by a wet method completely solves the defects of the impregnated resin for the wed-method hydrolysis resistance synthetic leather such as poor film-forming properties, slow impregnation speed, low peeling strength and the like, and meanwhile the hydrolysis resistance thereof can also meet the requirements of the hydrolysis resistance synthetic leather.

Description

technical field [0001] The invention relates to an ester-type polyurethane resin for wet-process synthetic leather, in particular to a polyester-type high-hydrolysis-resistant and high-peeling polyurethane resin for one-component wet-process synthetic leather and a preparation method thereof. Background technique [0002] At present, in the fields of shoes, luggage, and clothing, it is the general trend for synthetic leather to replace genuine leather, which is expensive and has limited resources. The high hydrolysis resistance and high peeling characteristics of genuine leather have always been the goals pursued by the synthetic leather industry. The impregnation process in the process of synthetic leather can make the back of the cloth base have the effect of imitation leather, so the impregnation process plays an important role in the synthetic leather industry. The impregnating resin for high hydrolysis-resistant synthetic leather in wet process requires excellent hydrol...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/44D06M15/572D06N3/14
Inventor 陈华郦向宇金朝锋
Owner ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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