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Polyurethane resin for hydrolysis-resistant sofa leather and preparation method thereof

A technology of polyurethane resin and sofa leather, which is applied in the field of ten-year hydrolysis-resistant polyurethane resin for sofa leather and its preparation, which can solve the problems of degradation, cracking and peeling strength of the leather surface, and achieve soft hand feeling, improved softness and increased polarity Effect

Active Publication Date: 2014-11-26
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a 10-year hydrolysis-resistant polyurethane resin for sofa leather and its preparation method, to solve the problem that the existing ordinary soft wet-process polyurethane resin is processed through constant temperature and humidity (70°C*95%RH). After a week, defects such as cracking or a sharp drop in peel strength appear on the leather surface

Method used

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  • Polyurethane resin for hydrolysis-resistant sofa leather and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The raw material composition (unit kg) is as follows:

[0043] Polytetrahydrofuran ether glycol 700

[0044] Polycarbonate diol 220

[0045] Ethylene glycol 68

[0046] 4,4-Diphenylmethanediamine 5

[0047] 4,4-Diphenylmethane diisocyanate 395.5

[0048] Catalyst MB20 0.2

[0049] Antioxidant 1010 2.0

[0050] water repellant 15

[0051] N,N-Dimethylformamide 3615

[0052] Polytetrahydrofuran ether glycol is a polyether polyol with a number average molecular weight of 2000±200g / mol.

[0053] Polycarbonate diol is a polycarbonate polyol with a number average molecular weight of 2000±200g / mol.

[0054] Its preparation method is as follows:

[0055]1. Put 35% of the total weight of polyether and polycarbon polyol mixture and N,N-dimethylformamide into the reaction kettle for mixing, stir for 10 minutes and then put 172.5kg of 4,4-diphenylmethane Diisocyanate (MDI) reaction, so that the molar ratio of the hydroxyl group in the polyether and polycarbonate polyol mi...

Embodiment 2

[0062] The raw material composition (unit kg) is as follows:

[0063] Polytetrahydrofuran ether glycol 620

[0064] Polycarbonate diol 300

[0065] Ethylene glycol 65

[0066] 4,4-Diphenylmethanediamine 10

[0067] 4,4-Diphenylmethane diisocyanate 389.7

[0068] Catalyst MB20 0.2

[0069] Antioxidant 2246 2.0

[0070] water repellant 15

[0071] N,N-Dimethylformamide 3600

[0072] Polytetrahydrofuran ether glycol is a polyether polyol with a number average molecular weight of 2000±200g / mol.

[0073] The polycarbonate diol is a polycarbon polyol with a number average molecular weight of 2000±200 g / mol.

[0074] Its preparation method is as follows:

[0075] 1. Put 35% of the total weight of the polyether and polycarbon polyol mixture and N,N-dimethylformamide into the reaction kettle for mixing, stir for 10 minutes and then put in 172.5 kg of 4,4-diphenylmethane Diisocyanate (MDI) reaction, so that the molar ratio of the hydroxyl group in the polyether and polycarbona...

Embodiment 3

[0081] In order to verify that the ten-year hydrolysis-resistant sofa leather of the present invention is made of polyurethane resin, the synthetic leather not only feels soft, plump, and has good elasticity, but also can meet the requirements of constant temperature and humidity (70°C*95%RH) and the peel strength can still be retained after ten weeks. More than 90%, compare the resin prepared in the above examples 1-2 with the ordinary soft low modulus wet polyurethane resin, and make a sample into wet-process crust leather to test its peeling performance, (wherein the formula for proofing is: DMF: 120 , S-7: 2, S-8I: 1, lignin: 20, resin 100, color paste: 2, the unit is KG) The results are shown in the following table:

[0082]

[0083] After testing, the wet-laid crust made of ordinary soft low-modulus wet-type polyurethane resin has soft hand feeling, good fullness and elasticity; the wet-laid crust made of the polyurethane resin prepared in Examples 1 and 2 of the prese...

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Abstract

The invention discloses a polyurethane resin for hydrolysis-resistant sofa leather and a preparation method thereof. The polyurethane resin is prepared from diisocyanate, a polyether-polycarbon polyalcohol mixture, a chain extender, a catalyst, assistants, a solvent and a terminator. The preparation method comprises the following steps: carrying out prepolymerization reaction on the polyether-polycarbon polyalcohol mixture and part of diisocyanate, and adding a small molecule dibasic alcohol-diamine mixture chain extender to carry out chain extension reaction; and finally, adding the terminator and assistants to finish the reaction, so that the viscosity of the resin is controlled within the standard range. The polyurethane resin has the advantages of soft feeling, plumpness and favorable elasticity, and the peel strength is still higher than 90% after the polyurethane resin is under the conditions of constant temperature and humidity (70 DEG C*95% RH) for ten weeks.

Description

technical field [0001] The invention relates to a wet type polyurethane resin, in particular to a ten-year hydrolysis-resistant polyurethane resin for sofa leather and a preparation method thereof. [0002] Background technique [0003] Due to limited leather resources and high prices, it cannot meet the growing market demand. Polyurethane synthetic leather products have a wide range of raw materials, cheap prices, and good processing performance. They have reached or exceeded the characteristics of natural leather and fully meet people's life pursuits. [0004] The application of polyurethane resin in synthetic leather is mainly reflected in many fields such as clothing, bags, shoes, furniture, and automobiles. The use of polyurethane resin puts forward higher requirements, such as sofa leather, clothing leather, glove leather and high-end furniture leather, which not only require soft, plump, and good elasticity, but also meet the requirements of durability, that is, con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/48C08G18/44C08G18/32C08K5/134C08K5/13
CPCC08G18/12C08G18/4018C08G18/44C08G18/4854C08G18/7671C08K5/13C08K5/1345C08G18/3206C08G18/3243
Inventor 吴兴保惠坚强武春余汪燕飞戴永强
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL
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