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Weak solvent aliphatic polyurethane resin for synthetic leather and preparation method thereof

A technology of polyurethane resin and weak solvent is applied in the field of weak solvent aliphatic polyurethane resin for synthetic leather and its preparation, which can solve the problems of yellowing and general yellowing resistance, and achieve the effect of maintaining hand feeling and characteristics.

Active Publication Date: 2012-11-07
ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It uses aromatic isocyanate and antioxidants to achieve the purpose of yellowing. The effect of yellowing resistance is average and can only reach level 4.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Heat 53 parts of polybutylene adipate diol (molecular weight: 2000) and 100 parts of polycarbonate diol (molecular weight: 2000) to 100°C, vacuum dehydrate for about 1 hour, and cool down to 50°C; add toluene into the reaction kettle 150 parts, 61 parts of IPDI, 51 parts of HDI, 10 parts of ethylene glycol, 1 part of dibutyltin dilaurate, stir evenly, heat up to 80°C, react for 3h; add 12 parts of 1,4-butanediol, 80°C Continue to react for 3 hours; cool down to 50°C, add 200 parts of toluene, 200 parts of isopropanol, and 150 parts of ethyl acetate and stir evenly, then slowly increase the viscosity with 12 parts of isophordione diamine, when the viscosity rises to 80000cps, Stop adding isophordione diamine; continue to stir for 30 minutes, then cool to 30°C and discharge; obtain a solid content of 30% and a modulus of about 100kgf / cm 2 weak solvent aliphatic polyurethane resin.

Embodiment 2

[0036]Heat 162.7 parts of polytetrahydrofuran diol (molecular weight 2000) to 100°C, vacuum dehydrate for about 1 hour, and cool down to 50°C; add 150 parts of toluene, 32 parts of IPDI, 2 parts of hydroxyorganosilicon additives, dilauric acid 0.3 parts of dibutyltin, stir evenly, heat up to 90°C, react for 2 hours; add 1 part of 1,4-butanediol, 0.5 parts of diethylene glycol continue reaction at 90°C for 2 hours; cool down to 50°C, add toluene 50 parts, 300 parts of isopropanol, 300 parts of propylene glycol monomethyl ether, after stirring evenly, slowly increase the viscosity with 1.5 parts of ethylenediamine, when the viscosity rises to 5000cps, stop adding ethylenediamine; continue stirring for 30 minutes, and then Cool to 30°C and discharge; obtain a solid content of 20% and a modulus of 25kgf / cm 2 weak solvent aliphatic polyurethane resin.

Embodiment 3

[0038] Heat 35 parts of polyethylene adipate-butylene glycol (molecular weight: 3000) and 35 parts of polycaprolactone diol (molecular weight: 1000) to 100°C, vacuum dehydrate for about 1 hour, and cool down to 50°C; Add 150 parts of toluene, 83 parts of IPDI, 19 parts of H12MDI, and 0.2 parts of stannous octoate into the reaction kettle, stir evenly, heat up to 90°C, and react for 3 hours; add 5 parts of 1,4-butanediol, 9 parts of new Continue to react pentylene glycol at 90°C for 3 hours; cool down to 50°C, add 250 parts of toluene, 200 parts of isobutanol, and 200 parts of ethyl acetate, stir well, and slowly increase the viscosity with 13.8 parts of IPDA, when the viscosity rises to At 3000cps, stop adding isophordione diamine; continue to stir for 30 minutes, then cool to 30°C and discharge; obtain a solid content of 20% and a modulus of 180kgf / cm 2 weak solvent aliphatic polyurethane resin.

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Abstract

The invention relates to the technical field of materials for synthetic leather, in particular to weak solvent aliphatic polyurethane resin for synthetic leather and a preparation method thereof. The weak solvent aliphatic polyurethane resin for synthetic leather is prepared from the following components by weight percent: 2-30 percent of aliphatic diisocyanate compound, 5-40 percent of polyesteror polyether polyalcohol compound, 0-10 percent of micromolecule polyol chain extender, 0.1-13 percent of micromolecule polyamine chain extender, 0.01-1.0 percent of catalyst, 0.05-5.0 percent of assistant and 45-85 percent of organic mild solvent. The invention also discloses the preparation method of the weak solvent aliphatic polyurethane resin for synthetic leather. By adopting the technical scheme, the polyurethane resin with different solid contents, different viscosities and different modulus can by synthesized, the requirement of the synthetic leather is satisfied, and the synthetic leather product with high temperature resistance, cold resistance, anti-sticking performance and better external tensility of pigment can be prepared.

Description

technical field [0001] The invention relates to the technical field of synthetic leather materials, in particular to a weak-solvent aliphatic polyurethane resin for synthetic leather and a preparation method thereof. technical background [0002] In terms of polyurethane resin for synthetic leather, aromatic products are mainly used now, and the price of the product is relatively low, and the synthesis process is relatively simple. However, aromatic products generally contain strong solvents such as DMF and MEK, which will corrode the bottom embryo during the production and surface treatment of synthetic leather, affecting the feel and effect of synthetic leather. In addition, since the aromatic polyurethane resin contains benzene rings, the rings will open when exposed to ultraviolet light, resulting in yellowing of the resin, and when used in light-colored synthetic leather products, the product will change color. The aliphatic polyurethane resin does not contain benzene ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/44C08G18/48C08K5/54D06N3/14
Inventor 陈华郦向宇戴文琪
Owner ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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