Short-flow, water-free and release-paper-saving method for manufacturing water-based synthetic leather

Abstract

The invention discloses a short-flow, water-free and release-paper-saving method for manufacturing water-based synthetic leather. The method is characterized in that a base with the bottom sealed is directly coated with a foaming coating and a surface layer to produce the water-based foamed synthetic leather; the synthetic leather produced by the method is of a porous structure, and accordingly, the breathability and moisture permeability of the water-based polyurethane synthetic leather (as shown in . 1) are improved; the specific peeling strength of the finished leather is greatly improved by a special bottom sealing technique. Compared with a water-based wet solidification process, the method has the advantages that processes of solidification, water washing, and the treatment of saltywastewater are omitted, so that the effects of saving water, reducing emission and simplifying the process are achieved. Compared with a dry coating-transfer method for manufacturing synthetic leather, the method has the advantages that the resource of release paper is saved, the whole process is short, the production technique is a short-flow, water-free, pollution-free and release-paper-saving technique for manufacturing the synthetic leather, and the application prospect is broad.

Description

technical field [0001] The invention belongs to the field of synthetic leather manufacture, and in particular relates to a short process, no water consumption and release paper-saving water-based synthetic leather manufacturing method. Background technique [0002] After decades of development, my country's synthetic leather industry has grown from scratch to today's big production and consumption country. Since the early synthetic leather used solvent-based polyurethane, its solvent pollution has gradually attracted attention from all walks of life. Therefore, in recent years, it is the general trend to gradually adopt water-based polyurethane instead of solvent-based polyurethane to produce synthetic leather. Although water-based polyurethane synthetic leather is more environmentally friendly than solvent-based polyurethane synthetic leather, its hygienic performance is not as good as that of natural leather, and its comfort needs to be improved. Therefore, how to increase...

AI Technical Summary

Problems solved by technology

However, this requires a large amount of water to be consumed during the coagulation process. According to statistics, about 35 tons of coagulation water is required for every 10,000 meters of wet-process synthetic leather; and the post-treatment of salt and acid in wastewater is difficult, which pushes up production costs; at the same time, this High process energy consumption and low production efficiency (production efficiency is 6-10 m / min)

[0004] Another patent document CN107059420A discloses a water-based polyurethane dry foaming process to produce garment leather. The method is to use release paper as a carrier and transfer coating to manufacture water-based foamed garment leather. First, the surface layer of water-based polyurethane surface layer slurry The material is coated on the release paper, and after drying, the foam layer is coated and scraped. Finally, the dried and shaped foam layer is bonded to the base fabric through the water-based adhesive layer and dried, and the release paper is recycled to obtain a fully water-based foam garment. leather, the process steps are as image 3 As shown in a; although this production process replaces traditional solvent-based water-based polyurethane with water-based polyurethane, and eliminates the pollution of organic solvents from the source, the high-temperature drying in the production process causes a large loss of release paper, and the price of release paper is high. The price is as high as 50 yuan / square meter, which seriously pushes up the production cost; and it adopts the production process of release paper transfer coating, the process is complicated and cumbersome, and the production efficiency is not high

[0005] The Chinese invention patent with the application number CN105239417A discloses a formula and process for the production of superfiber synthetic leather by water-based polyurethane foam finishing. Finally, complex finishing steps such as skin grinding, embossing, and lamination of the surface layer and the foamed bass by using release paper as a carrier to obtain water-based polyurethane microfiber synthetic leather. Although this process is completely water-based and meets environmental protection requirements, its follow-up Still use the release paper to transfer the surface layer, the loss of the release paper is large, and it is directly coated with the foam coating, the foam coating has a high viscosity, the slurry is not easy to penetrate into the microfiber base cloth, and the foam coating is bonded to the substrate Not strong, low peel strength, difficult to meet the high peel strength requirements of shoe upper leather, sofa leather, automobile leather, ball leather, etc.

Images