Aliphatic polyurethane resin preparation method

A technology of aliphatic polyurethane and resin, which is applied in textiles and papermaking, and can solve problems such as yellowing and general yellowing resistance

Active Publication Date: 2014-06-04
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

[0035] Heat 53 parts of polybutylene adipate diol (molecular weight 2000) and 100 parts of polycarbonate diol (molecular weight 2000) to 100°C, vacuum dehydration for about 1h, and cool to 50°C; add toluene to the reactor 150 parts, IPDI 61 parts, HDI 51 parts, ethylene glycol 10 parts, 1 part dibutyltin dilaurate, stir evenly, heat up to 80℃, react for 3h; add 12 parts of 1,4-butanediol, 80℃ Continue the reaction for 3 hours; lower the temperature to 50°C, add 200 parts of toluene, 200 parts of isopropanol, and 150 parts of ethyl acetate. After stirring evenly, slowly increase the viscosity with 12 parts of isophordione diamine. When the viscosity rises to 80,000 cps, Stop adding isophordione diamine; continue stirring for 30 minutes, then cool to 30°C, and discharge; obtain a solid content of 30% and a modulus of about 100kgf / cm 2 The weak solvent aliphatic polyurethane resin.

Embodiment 2

[0037] Raise 162.7 parts of polytetrahydrofuran glycol (molecular weight 2000) to 100°C, vacuum dehydration for about 1h, and cool to 50°C; add 150 parts of toluene, 32 parts of IPDI, 2 parts of hydroxy silicone additives, and dilauric acid to the reactor 0.3 part of dibutyltin, stir evenly, heat up to 90℃, react for 2h; add 1 part of 1,4-butanediol, 0.5 part of diethylene glycol, continue the reaction at 90℃ for 2h; reduce the temperature to 50℃, 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, then Cool to 30℃, discharge; get a solid content of 20%, and a modulus of 25kgf / cm 2 The weak solvent aliphatic polyurethane resin.

Embodiment 3

[0039] Heat 35 parts of polyethylene adipate-butanediol ester diol (molecular weight 3000) and 35 parts of polycaprolactone diol (molecular weight 1000) to 100°C, vacuum dehydration for about 1h, and cool down to 50°C; Add 150 parts of toluene, 83 parts of IPDI, 19 parts of H12MDI, 0.2 parts of stannous octoate to the reaction kettle, stir evenly, heat up to 90°C, and react for 3 hours; add 5 parts of 1,4-butanediol and 9 parts of fresh Pentylene glycol continued to react at 90°C for 3 hours; cooled to 50°C, added 250 parts of toluene, 200 parts of isobutanol, and 200 parts of ethyl acetate. After stirring, slowly increase the viscosity with 13.8 parts of IPDA. When the viscosity rises to When 3000cps, stop adding isophordione diamine; continue stirring for 30 minutes, then cool to 30°C, and discharge; obtain a solid content of 20% and a modulus of 180kgf / cm 2 The 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 an aliphatic polyurethane resin preparation method. The method includes the steps: 1) increasing the temperature of 35 parts of poly adipic acid glycol-butanediol ether glycol and 35 parts of polycaprolactone glycol to 100 DEG C, performing vacuum dehydration for about 1h and cooling to 50 DEG C, wherein the molecular weight of the poly adipic acid glycol-butanediol ether glycol is 3000, and the molecular weight of the polycaprolactone glycol is 1000; 2) adding 150 parts of methylbenzene, 83 parts of IPDI (isophorone diisocyanate), 19 parts of H12MDI (dicyclohexylmethane 4,4- diisocyanate) and 0.2 part of stannous octoate into a reactor with stirring uniformly, increasing the temperature to 90 DEG C and reacting for 3h; 3) adding 5 parts of 1,4-butanediol and 9 parts of neopentyl glycol to continue reaction for 3h at the temperature of 90 DEG C; 4) cooling to 50 DEG C, adding 250 parts of methylbenzene, 200 parts of isobutyl alcohol and 200 parts of ethyl acetate with stirring uniformly, slowly tackifying with 13.8 parts of IPDA (isophorone diamine), and stopping adding the isophorone diamine when the viscosity is increased to 3000cps; and 5) continuing to stir for 30 minutes and cooling to 30 DEG C to discharge, so that weak-solvent aliphatic polyurethane resin with 20% of solid content and 180kgf / cm<2> of modulus is obtained.

Description

[0001] The present invention application is a divisional application of the invention patent application with the patent application number: 2010101524769, the patent name: weak solvent aliphatic polyurethane resin for synthetic leather and its preparation method, and the application date: 2010-4-21. technical field [0002] The invention relates to the technical field of synthetic leather materials, in particular to a preparation method of aliphatic polyurethane resin. technical background [0003] 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. During the production and surface treatment of synthetic leather, they will corrode the bottom layer and affect the feel and effect of synthetic leather. In addition, since the aromatic polyurethane resin contains...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/42C08G18/32D06N3/14
Inventor 陈华郦向宇戴文琪
Owner ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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