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Polyurethane resin for synthetic leather surface layer, and preparation method thereof

A technology of polyurethane resin and synthetic leather, applied in the field of polyurethane resin, can solve the problems of insufficient temperature resistance of synthetic leather, large difference in leather feeling, damage to the surface layer, etc., and achieve the effect of soft hand feeling, good effect and outstanding wear resistance.

Active Publication Date: 2020-06-12
ZHEJIANG HUAFON SYNTHETIC RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are currently many problems in the field of printable synthetic leather, such as: the temperature resistance of conventional synthetic leather is not enough, the surface layer is damaged or deformed after high-temperature embossing or high-temperature vacuum absorption; There is a big difference between the feeling of weight and the feeling of real leather; the precipitation and decomposition of small molecular substances or additives in synthetic leather at high temperature affect the surface effect of the material and the comprehensive physical properties such as wear resistance and scratch resistance

Method used

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  • Polyurethane resin for synthetic leather surface layer, and preparation method thereof
  • Polyurethane resin for synthetic leather surface layer, and preparation method thereof
  • Polyurethane resin for synthetic leather surface layer, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) 17.2kg number-average molecular weight is 1000 neopentyl glycol adipate glycol, 35kg number-average molecular weight is 2000 polytetramethylene ether glycol, 1.9kg number-average molecular weight is 1000 amino-sealed The terminal polysiloxane and 100kg of solvent N,N-dimethylformamide were added to the reactor and stirred at 50°C until completely dissolved, then 5kg of diphenylmethane diisocyanate was added and the temperature was raised to 70°C for prepolymerization for 1 hour;

[0060] (2) Continue to add 6kg of diethylene glycol and 0.1kg of trimethylolpropane, lower the temperature to 50°C and stir for 30 minutes, add the catalyst dibutyltin dilaurate, and add 19.3kg of diphenylmethane diisocyanate to heat up to 70°C Continue to react for 0.5h;

[0061] (3) Add the remaining 200kg of solvent N,N-dimethylformamide until the viscosity reaches 110cps, then lower the temperature to 50°C and continue to stir for 1h, then add 5.2kg of hexamethylene diisocyanate to sel...

Embodiment 2

[0068] (1) 20kg number-average molecular weight is 2000 adipate-1,4-butanediol ester, 26kg number-average molecular weight is the polytetramethylene ether glycol of 3000, 1.5kg number-average molecular weight is the terminal hydroxyl of 2000 Add polysiloxane and 80kg solvent N,N-dimethylformamide to the reactor and stir at 40°C until completely dissolved, then add 3.8kg diphenylmethane diisocyanate and heat to 70°C for prepolymerization for 0.5h ;

[0069] (2) Continue to add 9.7kg 1,4-butanediol and 0.3kg trimethylolpropane, lower the temperature to 50°C and stir for 30 minutes, add the catalyst dibutyltin dilaurate, and add 29kg diphenylmethane diisocyanate to heat up Continue to react at 70°C for 0.5h;

[0070] (3) Add the remaining 100kg of solvent N,N-dimethylformamide until the viscosity reaches 118cps, then lower the temperature to 50°C and continue to stir for 1h, add 3kg of hexamethylene diisocyanate to self-polymerize to obtain a polymerization degree of 3 Compound...

Embodiment 3

[0077] (1) 14.4kg number-average molecular weight is 3000 adipate-ethylene glycol-1,4-butanediol ester glycol, 32.8kg number-average molecular weight is the polytetramethylene ether glycol of 2000, 0.3 Add kg of amino-terminated polysiloxane with a number average molecular weight of 1000, and 100 kg of solvent N,N-dimethylformamide into the reactor, stir at 55°C until completely dissolved, then add 4.3 kg of diphenylmethane diisocyanate and heat up Carry out prepolymerization at 80°C for 1 hour;

[0078] (2) Continue to add 5kg of ethanolamine and 0.2kg of trimethylolpropane, lower the temperature to 50°C and stir for 15 minutes, add the catalyst dibutyltin dilaurate, and add 21.9kg of diphenylmethane diisocyanate and heat up to 80°C to continue the reaction 1h;

[0079] (3) Add the remaining 100kg of solvent N,N-dimethylformamide until the viscosity reaches 120cps, then lower the temperature to 50°C and continue to stir for 1.5h, add 4.1kg of hexamethylene diisocyanate to se...

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Abstract

The invention relates to a polyurethane resin for a synthetic leather surface layer, and a preparation method thereof. The preparation method of the polyurethane resin comprises the following steps: jointly adding polyether polyol, polyester polyol, polysiloxane a and a part of solvent into a reaction kettle, stirring at 40-55 DEG C until the components are completely dissolved, adding a part of isocyanate, heating to 70-80 DEG C, and carrying out a prepolymerization reaction for 0.5-1 h; continuously adding a small molecular chain extender, cooling to 50 DEG C, stirring for 15-30 min, addinga catalyst, supplementing the remaining isocyanate, heating to 70-80 DEG C, and continuously reacting for 0.5-1 h; and supplementing the remaining solvent until the viscosity reaches 100-160 cps, cooling to the temperature of 50 DEG C, continuously stirring for 1-1.5 h, and adding isocyanurate and polysiloxane b to obtain the polyurethane resin for the synthetic leather surface layer. The productprovided by the invention has outstanding wear resistance and heat resistance, does not whiten after high-temperature embossing, has a remarkable antifouling effect after being applied to synthetic leather, and is not prone to being stained with dust.

Description

technical field [0001] The present invention relates to a polyurethane resin. In particular, it relates to a polyurethane resin which can be used as the surface layer material of synthetic leather. Background technique [0002] Synthetic leather is mainly composed of base fabrics such as non-woven fabrics or woven fabrics at the bottom layer, microporous polyurethane foam layer in the middle layer, and polyurethane coating on the surface layer, which is a leather product close to the touch of genuine leather. Among them, the surface layer is the outermost material of synthetic leather, and its main functions include: increasing the appearance and touch of synthetic leather to make it closer to genuine leather, and improving the performance of synthetic leather such as wear resistance, scratch resistance, antifouling, and anti-yellowing. [0003] With the diversification of people's needs, the market of printable synthetic leather has gradually developed. At present, it is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/76C08G18/61C08G18/48C08G18/42C08G18/40C08G18/12C08G18/32D06N3/14
CPCC08G18/12C08G18/4018C08G18/4238C08G18/4854C08G18/61C08G18/7671C08G18/792D06N3/14D06N3/146D06N3/147D06N2209/146D06N2211/28C08G18/3206C08G18/3271
Inventor 韩飞龙张初银方飞孙凡杜飘扬芩小春
Owner ZHEJIANG HUAFON SYNTHETIC RESIN
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