Low-foam and anti-ageing wet type polyurethane resin for synthetic leather and preparation method thereof

A wet-process polyurethane and polyurethane resin technology, applied in textiles and papermaking, can solve problems such as poor recovery, poor elasticity, and large creases, and achieve good recovery, low cost, and small creases.

Active Publication Date: 2013-03-13
SHANGHAI HUIDE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing wet-process polyurethane resins for synthetic leather have the technical problems of high cost, large and large cells, poor elasticity, large creases after folding, and poor recovery.

Method used

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  • Low-foam and anti-ageing wet type polyurethane resin for synthetic leather and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Formula

[0037] Diphenylmethane-4,4'-diisocyanate 95.79kg;

[0038] Polybutylene adipate diol (number average molecular weight 3000g / mol) 150kg;

[0039] Phthalic anhydride polyester polyol (number average molecular weight 3000g / mol) 40kg;

[0040] Castor oil 10kg;

[0041] Ethylene glycol 12.46kg;

[0042] N, N-dimethylformamide 767kg;

[0043] Polyoxypropylene diol 20.49kg.

[0044] 2. Preparation method

[0045] In the reactor, drop into polybutylene adipate diol (number-average molecular weight 3000) 150kg, phthalic anhydride polyester polyol (number-average molecular weight 3000g / mol) 40kg, ethylene glycol 12.46kg, N, N-dimethyl Diphenylmethane-4,4'-diisocyanate (MDI) 280kg, stirred evenly, and reacted with 87.5kg of diphenylmethane-4,4'-diisocyanate (MDI), the reaction temperature was controlled at 75~85°C, after 2 hours of reaction, the reaction liquid was sampled and tested When the viscosity reaches 120-140Pa·s / 50°C, continue to put 10kg of castor oi...

Embodiment 2

[0047] 1. Formula

[0048] Diphenylmethane-4,4-diisocyanate 98.56kg;

[0049]Polybutylene adipate diol (number average molecular weight 2000g / mol) 60kg;

[0050] Polyethylene adipate-butylene glycol ester diol (number average molecular weight 4000g / mol) 60kg;

[0051] Phthalic anhydride polyester polyol (number average molecular weight 340) 30kg;

[0052] Castor oil 15kg;

[0053] 1,4-butanediol 21.54kg;

[0054] N, N-dimethylformamide 731.4kg;

[0055] Polyoxypropylene diol 28.37kg.

[0056] 2. Preparation method

[0057] In the reactor, drop into polybutylene adipate diol (number average molecular weight 2000) 60kg, polyethylene adipate-butylene glycol ester diol (number average molecular weight 4000g / mol) 60kg, phthalic anhydride polyester 30kg of polyol, 21.54kg of 1,4-butanediol, 210kg of N,N-dimethylformamide (DMF), mix well and add diphenylmethane-4,4-diisocyanate (MDI) 85.7 kg for the reaction, the reaction temperature is controlled at 75~85°C, after 2 hours of...

Embodiment 3

[0059] 1. Formula

[0060] Diphenylmethane-4,4‵-diisocyanate (MDI) 132.75kg;

[0061] Polybutylene adipate diol (number average molecular weight 2000g / mol) 120kg;

[0062] Phthalic anhydride polyester polyol (number average molecular weight 1000g / mol) 40kg;

[0063] Castor oil 8kg;

[0064] Ethylene glycol 6.5kg;

[0065] 1,4-butanediol 28.31kg;

[0066] N, N-dimethylformamide 814.3kg;

[0067] Polyoxypropylene diol 13.42kg.

[0068] 2. Preparation method

[0069] Put 120kg of polybutylene adipate diol (number average molecular weight 2000), 40kg of phthalic anhydride polyester polyol (number average molecular weight 1000g / mol), 6.5kg of ethylene glycol, and 1,4-butanediol into the reaction kettle. Alcohol 28.31kg, N,N-dimethylformamide (DMF) 195kg, mixed and stirred evenly, put into reaction with diphenylmethane-4,4‵-diisocyanate (MDI) 123kg, the reaction temperature is controlled at 75~85 ℃, after 2.5 hours of reaction, when the viscosity of the reaction solution rea...

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Abstract

The invention relates to a flow-foam and anti-ageing wet type polyurethane resin for synthetic leather and a preparation method thereof. The polyurethane resin comprises the following components in percentage by weight: 7 to 15% of diphenylmethane-4, 4'-diisocyanate, 8 to 15% of polyadipate type polyester polyol, 2 to 7% of diethylene glycol phthalic anhydride polymer, 0.5 to 3% of castor oil, 1 to 4% of chain extender, 60 to 80% of N, N-dimethylformamide, and 1 to 4% of assistant. The polyurethane resin is less and small in foam structure (low foam), high in elasticity, small in crease after being creased, and high in restorability.

Description

technical field [0001] The invention relates to the technical field of polyurethane resin preparation, and more specifically relates to a wet-process polyurethane resin for low-foaming and aging-resistant synthetic leather and a preparation method thereof. Background technique [0002] China's light industry leather processing ranks first in the world. The export volume of leather products ranks first in the light industry for many years in a row. China is increasingly becoming a processing and production base for international brand leather products, and the production technology has fully reached the international advanced level. After decades of rapid development, the current leather products are extremely rich. At the same time, China is also a big country in the production of luggage. There are four major bag manufacturing bases in Huadu of Guangdong, Quanzhou of Fujian, Pinghu of Zhejiang and Baigou of Hebei. With the continuous improvement of people's living and con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/32C08G18/12D06N3/14
Inventor 钱建中钱洪祥巩倩邹文革黄凯华
Owner SHANGHAI HUIDE TECH CO LTD
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