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Polyurethane resin preparation method

A technology of polyurethane resin and polyadipic acid, applied in the field of preparation of polyurethane resin, can solve the problems of yellowing and general yellowing resistance effect, etc.

Inactive Publication Date: 2013-01-02
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 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

[0037] 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

[0039] 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 a polyurethane resin preparation method. The method includes the steps: 1) increasing the temperature of 145 parts of polyneopentanediol adipate with the molecular weight of 2000 to 100 DEG C, performing vacuum dehydration for about 1h and cooling to 50 DEG C; 2) adding 150 parts of methylbenzene, 251 parts of IPDI (isophorone diisocyanate) and 5 parts of organic bismuth catalysts into a reactor with stirring uniformly, increasing the temperature to 90 DEG C and reacting for 2h; 3) adding 46 parts of 1,6-hexanediol to continue reaction for 2h at the temperature of 90 DEG C; 4) cooling to 50 DEG C, adding 100 parts of methylbenzene, 100 parts of normal butanol and 100 parts of isopropyl alcohol with stirring uniformly, slowly tackifying with 53 parts of isophorone diamine, and stopping adding the isophorone diamine when the viscosity is increased to 150000cps; and 5) continuing to stir for 30 minutes and cooling to 30 DEG C to discharge so that weak-solvent aliphatic polyurethane resin with 50% of solid content and 220kgf / 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 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 benzene r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/48C08G18/42C08G18/44C08G18/32C08G18/10C08G18/12
Inventor 陈华郦向宇戴文琪
Owner ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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