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Preparation method of dry, comfortable and cold-resistant surface-layer polyurethane resin for elastic leather

A polyurethane resin and elastic leather technology, applied in the field of synthetic leather manufacturing, can solve the problems of high resin modulus, poor low temperature flexural performance, stiff hand feeling, etc., and achieve excellent low temperature flexural performance, strong fullness, and dry leather surface. Effect

Inactive Publication Date: 2015-12-16
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing elastic leather with a dry and cold-resistant surface layer polyurethane resin, which solves the problem that the resin prepared by the existing polyurethane preparation method has a high modulus, stiff hand feeling after being made into leather, and low-temperature bending. The problem of poor flexibility

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a dry and cold-resistant surface layer polyurethane resin for elastic leather, characterized in that it specifically includes the following steps:

[0023] (1) Put 270KgPET-1, 890KgPTMG-2, 12Kg antioxidant, 2000KgN,N-dimethylformamide (DMF) solvent into the reactor and stir for 10-20 minutes, then put 188Kg4,4-diphenyl Methane diisocyanate (MDI) is prepolymerized, the reaction time is 1-1.5 hours, and the temperature is 70-80°C;

[0024] (2) After the prepolymerization reaction is completed, continue to add 200Kg of ethylene glycol to the reaction solution in step (1) for reaction, the reaction time is 1-1.5 hours, and the temperature is 70-80°C;

[0025] (3) Continue to add 790KgMDI and 0.2Kg catalyst to the reaction kettle, and react in the presence of the catalyst at a temperature of 70-80°C. As the viscosity of the system continues to increase, gradually add 3257KgDMF solvent, and the final viscosity is controlled at 8 10,000-120,000 cps, add...

Embodiment 2

[0029] A method for preparing a dry and cold-resistant surface layer polyurethane resin for elastic leather, characterized in that it specifically includes the following steps:

[0030] (1) Put 210KgPET-1, 900KgPET-2, 12Kg antioxidant, 2000KgN,N-dimethylformamide (DMF) solvent into the reactor and stir for 10-20 minutes, then put 170Kg4,4-diphenyl Methane diisocyanate (MDI) is prepolymerized, the reaction time is 1-1.5 hours, and the temperature is 70-80°C;

[0031] (2) After the prepolymerization reaction is completed, continue to add 280Kg1,4-butanediol to the reaction solution in step (1) for reaction, the reaction time is 1-1.5 hours, and the temperature is 70-80°C;

[0032] (3) Continue to add 735KgMDI and 0.3Kg catalyst to the reaction kettle, and react in the presence of the catalyst at a temperature of 70-80°C. As the viscosity of the system continues to increase, gradually add 3355KgDMF solvent, and the final viscosity is controlled at 8 10,000-120,000 cps, add an ap...

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PUM

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Abstract

The invention discloses a preparation method of dry, comfortable and cold-resistant surface-layer polyurethane resin for elastic leather. The method comprises the steps that a polyatomic alcohol compound, an antioxidant and solvent are put into a reaction kettle and stirred for 10-20 minutes, then diisocyanate is put into the reaction kettle, and a pre-polymerization reaction is performed for 1-1.5 hours at the temperature of 70 DEG C-80 DEG C, wherein the mole ratio of the diisocyanate to the polyatomic alcohol compound is 1.2-1.5:1; after the pre-polymerization reaction is finished, a micromolecular dihydric alcohol chain extender and diisocyanate are sequentially added, the reaction is continuously performed, and the polyurethane resin is obtained. According to the preparation method, a quantitative pre-polymerization method is adopted, the phase separation degree of soft segments and hard segments is improved, and the characteristics, such as the softness and low-temperature deflection properties, of the soft segments of the resin can be embodied; the leather surface of the finished leather is dry and comfortable, and the leather is soft, high in fullness and excellent in low-temperature deflection property.

Description

technical field [0001] The invention relates to the field of synthetic leather manufacture, in particular to a method for preparing a dry and cold-resistant surface layer polyurethane resin for elastic leather. Background technique [0002] At present, in order to ensure that the surface of shoe leather and bag leather is dry, the common method is to increase the modulus of the finished leather resin, but the disadvantage is that the finished leather feels stiff, not soft enough, and the fullness is not strong, and the flexural properties, especially low-temperature flexural properties Poor, resulting in limited range of application of elastic leather, the grade is not high. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing elastic leather with a dry and cold-resistant surface layer polyurethane resin, which solves the problem that the resin prepared by the existing polyurethane preparation m...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12C08G18/22C08L75/08C08L75/06D06N3/14
CPCC08G18/7671C08G18/12C08G18/227C08G18/4018C08G18/4202C08G18/4238C08G18/4854C08G18/664C08G18/6674C08G2261/93C08L75/06C08L75/08C08L2205/025D06N3/147D06N2211/28C08G18/3206
Inventor 宗军业吴兴保戴永祥刘永福
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL