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Polyurethane resin for high toluene-resistant superfine fiber synthetic leather and preparation method thereof

A polyurethane resin and ultra-fine fiber technology, used in textiles and papermaking, to achieve the effects of reducing molecular weight distribution, reducing proportion, reducing toluene swelling rate and toluene extraction rate

Active Publication Date: 2020-11-24
江苏华峰超纤材料有限公司
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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 kind of high toluene-resistant polyurethane resin for ultrafine fiber synthetic leather and its preparation method, to solve the technical deficiencies in the existing polyurethane resin for ultrafine fiber synthetic leather

Method used

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  • Polyurethane resin for high toluene-resistant superfine fiber synthetic leather and preparation method thereof
  • Polyurethane resin for high toluene-resistant superfine fiber synthetic leather and preparation method thereof
  • Polyurethane resin for high toluene-resistant superfine fiber synthetic leather and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Raw material used in this embodiment and weight table are as table 1

[0036] Table 1

[0037] Weight (g) moles Polytetrahydrofuran ether glycol (number molecular weight 1000) 100 0.1 Polybutylene adipate diol (number average molecular weight 1000) 200 0.2 Ethylene glycol 65.1 1.05 4,4’-Diphenylmethanediamine 89.1 0.45 Trimethylolpropane 0.402 0.003 diphenylmethane diisocyanate 451.13 1.8045 Methanol 0.58 0.0181 dimethylformamide 2114.73 Total 3021.04

[0038] The preparation method of the polyurethane resin for the high toluene-resistant microfiber synthetic leather of the present embodiment is as follows:

[0039] (1), 100g polytetrahydrofuran ether diol, 200g polybutylene adipate diol, 65.1g ethylene glycol, 0.402 trimethylol propane, 1057.37g dimethyl formamide are dropped into reaction kettle, 60 ℃ Stir evenly;

[0040] (2), put 451.13g of diphenylmethane diisocyanate into the react...

Embodiment 2

[0045] Raw material used in this embodiment and weight table are as table 2

[0046] Table 2

[0047] Weight (g) moles Polytetrahydrofuran ether glycol (number molecular weight 3000) 600 0.2 Polyethylene adipate diol (number average molecular weight 3000) 300 0.1 Butanediol 135 1.5 4,4’-Diphenylmethanediamine 297 1.5 Trihydroxypolyether (number average molecular weight 480) 1.44 0.003 diphenylmethane diisocyanate 826.13 3.3045 ethanol 1.99 0.0432 dimethylformamide 8646.24 Total 10807.8

[0048] The preparation method of the polyurethane resin for the high toluene-resistant microfiber synthetic leather of the present embodiment is as follows:

[0049] (1), put 600g polytetrahydrofuran ether diol, 300g polyethylene adipate diol, 135g butanediol, 1.44g trihydroxy polyether, 4323.12g dimethyl formamide into the reaction kettle, 50 ℃ Stir well;

[0050] (2), put 826.13g of diphenylmethane diisocyana...

Embodiment 3

[0055] Raw material used in this embodiment and weight table are as table 3

[0056] table 3

[0057]

[0058]

[0059] The preparation method of the polyurethane resin for the high toluene-resistant microfiber synthetic leather of the present embodiment is as follows:

[0060] (1), 200g polytetrahydrofuran ether diol, 100g polyhexamethylene glycol-3-methylpentanediol ester diol, 100g polycaprolactone diol, 86.4g butanediol, 0.22g glycerin, 1597.38g diol Methylacetamide was put into the reaction kettle, and stirred evenly at 55°C;

[0061] (2), put 450.9g of diphenylmethane diisocyanate into the reactor at one time, control the reaction temperature at 75°C, react under normal pressure, use di-n-butylamine titration to track and detect the content of isocyanate groups, and keep warm until the isocyanate groups When the content is constant, add the remaining 1597.38g of dimethylacetamide and lower the temperature to 62°C;

[0062] (3) Put 126.72g of 4,4'-diphenylmethane...

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Abstract

The invention discloses polyurethane resin with high toluene resistance for superfine fiber synthetic leather and a preparation method of the polyurethane resin. The polyurethane resin is prepared from raw materials containing components as follows: polyols, a chain extender, trifunctional compounds, diisocyanate, an end capping agent and a solvent. A hard polyurethane section with higher rigidityis obtained by adopting aromatic diamine, and an appropriate quantity of controllable trifunctional compounds are added, so that the polyurethane resin has lower toluene swelling rate and toluene extraction rate. Meanwhile, a heat treatment method is introduced when the polyurethane resin is prepared, molecular weight distribution of the polyurethane resin can be reduced, regularity of the polyurethane resin is improved, therefore, the ratio of small molecular weight in the polyurethane resin is reduced, and the toluene swelling rate and the toluene extraction rate of the polyurethane resin are further reduced.

Description

technical field [0001] The invention relates to a polyurethane resin and a preparation method thereof, in particular to a polyurethane resin for superfine fiber synthetic leather and a preparation method thereof. Background technique [0002] As we all know, microfiber synthetic leather is often divided into alkali weight reduction process and toluene weight reduction process. The toluene reduction process is a process in which the sea-island fiber non-woven fabric is impregnated with polyurethane resin to form a primary base fabric, and then the primary base fabric is subjected to 85°C hot toluene to extract the sea component in the fiber to form a superfine fiber synthetic leather. . Conventional sea components are low-density polyethylene or polystyrene. Since the entire extraction process lasts approximately 4 hours, high requirements are placed on the toluene resistance of the polyurethane. [0003] The toluene resistance of polyurethane resin for microfiber syntheti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32D06N3/14
CPCC08G18/3243C08G18/4018C08G18/4202C08G18/4238C08G18/4277C08G18/4812C08G18/4854C08G18/6607C08G18/6611C08G18/6618D06N3/14
Inventor 杨银龙张其斌孙向浩杜明兵张浩
Owner 江苏华峰超纤材料有限公司