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Method for producing two-layer transfer coating leather by aqueous polyurethane dry-method transfer coating process

A technology of water-based polyurethane and dry film transfer, which is applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, leather surface treatment, etc., can solve the problems of MDF residues, etc., to solve the residue problems and eliminate environmental pollution problems , Improve the effect of hygienic performance

Inactive Publication Date: 2012-06-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method that can not only eliminate the pollution problem caused by the use of solvents, solve the problem of MDF residue in the finished two-layer transfer film leather, but also improve the water vapor permeability of the coating, and improve the quality of the finished two-layer transfer film leather. Method for producing two-layer transfer film leather by using water-based polyurethane dry method transfer film technology for better hygienic performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Manufacture of back cover foam coating

[0022] By mass parts, 70 parts of soft water-based polyurethane, 5 parts of polyacrylic resin thickener, 3 parts of fluorine-modified hydroxyl-containing acrylic resin leveling agent and the industrialized high-dispersion pigment paste used in 5 parts of natural leather processing Mix evenly, and then 6 parts of blowing agent azobisisobutyronitrile (AIBN) are evenly dispersed in the mixed slurry to obtain a back cover foam coating;

[0023] Using the roller coating production line in the leather production process, the bottom cover foaming coating is rolled on the surface of the split leather, that is, the two-layer crust leather, and the application amount is 180g / m 2 , and then enter the drying tunnel to dry at 80°C, and finally use a roller ironing machine to iron and foam at 120°C to form a back cover foam coating on the surface of the split leather;

[0024] 2) Manufacture of surface coating

[0025] Mix 80 parts of med...

Embodiment 2

[0029] 1) Manufacture of back cover foam coating

[0030] In parts by mass, 50 parts of soft water-based polyurethane, 2 parts of polyacrylic resin thickener, 1 part of fluorine-modified hydroxyl-containing acrylic resin leveling agent and 3 parts of industrialized high-dispersion pigment paste used in natural leather processing Mix evenly, and then 4 parts of blowing agent azobisisobutyronitrile (AIBN) are evenly dispersed in the mixed slurry to obtain a back cover foam coating;

[0031]Using the roller coating production line in the leather production process, the bottom cover foaming coating is rolled on the surface of the split leather, that is, the two-layer crust leather, and the application amount is 240g / m 2 , and then enter the drying tunnel to dry at 65°C, and finally use a roller ironer to iron and foam at 140°C to form a back cover foam coating on the surface of the split leather;

[0032] 2) Manufacture of surface coating

[0033] Mix 60 parts of medium-hard wat...

Embodiment 3

[0037] 1) Manufacture of back cover foam coating

[0038] 80 parts of soft water-based polyurethane, 6 parts of polyacrylic resin thickener, 4 parts of fluorine-modified hydroxyl-containing acrylic resin leveling agent and the industrialized high-dispersion pigment paste used in 7 parts of natural leather processing by mass parts Mix evenly, and then 8 parts of blowing agent azobisisobutyronitrile (AIBN) are evenly dispersed in the mixed slurry to obtain a back cover foam coating;

[0039] Using the roller coating production line in the leather production process, the bottom cover foaming coating is rolled on the surface of the split leather, that is, the two-layer crust leather, and the application amount is 150g / m 2 , and then enter the drying tunnel to dry at 75°C, and finally use a roller ironing machine to iron and foam at 110°C to form a back cover foam coating on the surface of the split leather;

[0040] 2) Manufacture of surface coating

[0041] Mix 70 parts of medi...

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Abstract

The invention discloses a method for producing two-layer transfer coating leather by aqueous polyurethane dry-method transfer coating process. The method comprises the following steps of: firstly coating a bottom-closing foamed coating material on the surface of the split leather by use of a roll coating machine in leather production, and drying and then ironing by use of a drum-type ironing machine to form a bottom-closing foamed coating; then blade coating a top coating material and an adhesive coating material on release paper by use of a dry-method production line in synthetic leather production process; and finally, bonding the split leather with the bottom-closing foamed coating and the release paper with the adhesive coating, drying in a drying channel, cooling, separating, and transferring the coatings on the release paper onto the bottom-closing foamed coating, to obtain the two-layer transfer coating leather. The method produces the two-layer transfer coating leather by aqueous polyurethane dry-method transfer coating process and replaces the solvent-type polyurethane production system by the aqueous polyurethane production system, so as to eliminate pollution caused by solvents and solve the problem of MDF residues in the two-layer transfer coating leather. Besides, the method can enhance water permeability and vapor permeability of the coatings and improve health performance of the two-layer transfer coating leather final product.

Description

technical field [0001] The invention relates to the leather-making technology of the leather industry, in particular to a method for producing two-layer film-transferring leather by using the water-based polyurethane dry-process film-transfer technology. Background technique [0002] The leather industry is a traditional industry with comprehensive advantages in our country. At present, my country's leather output accounts for more than 20% of the world's total output; leather shoes output accounts for more than 50% of the world's total output; the export volume of industrial enterprises above designated size ranks first in the light industry for many years, accounting for 10% of the total export volume of the light industry. About 20%, becoming the pillar industry in the field of light industry. [0003] In the process of leather production, natural leather such as cowhide is relatively thick, and is usually cut into two or more layers. The layer with natural grain (the ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/02B32B9/04B32B27/40B32B27/18B32B37/12B32B38/10B32B38/18C14C11/00C09D175/04C09J175/04
Inventor 马兴元杨西萍蒋坤郭勇生
Owner SHAANXI UNIV OF SCI & TECH
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