Manufacturing method of ecological environment protection polyurethane superfine fiber synthetic leather

Abstract

The invention relates to a manufacturing method of ecological environment protection polyurethane superfine fiber synthetic leather. The method comprises the following steps: (1) unwinding base fabric, wherein the base fabric is superfine fiber synthetic leather base fabric used for alkali decrement; (2) impregnating the base fabric into aqueous slurry containing dissoluble hole forming filler, wherein the aqueous slurry contains waterborne polyurethane and the dissoluble hole forming filler; (3) drying; (4) impregnating the dried product into an acid treatment solution, squeezing to dryness and then washing; (5) carrying out alkali decrement, and washing; (6) drying to obtain the finished product. The dissoluble hole forming filler can be dissolved by means of an acid treatment solution impregnation process or a direct hot alkali decrement process, so that a foam structure, which is obtained by wet solidification similar to solvent type polyurethane resin, is obtained from polyurethane resin; an organic solvent is not used in a production process, and methylbenzene is not used in the decrement process, so that ecological environment protection is realized in the production process, and the product is free from any dissolution residue; the product is soft, good in elasticity and strong in leather feeling.

Description

technical field [0001] The invention belongs to the field of synthetic leather manufacture, and relates to a method for manufacturing superfine fiber synthetic leather, and a method for manufacturing ecological and environment-friendly polyurethane superfine fiber synthetic leather. Background technique [0002] The production process of traditional solvent-based microfiber synthetic leather is impregnated with solvent-based polyurethane resin. The solidification process includes impregnation of superfine fiber non-woven fabric with solvent-based polyurethane slurry, DMF aqueous solution coagulation bath, water washing, drying, toluene reduction, water washing, Drying and other steps, the production process uses a large amount of organic solvent N,N dimethylformamide (DMF), which will cause a large amount of DMF emissions and DMF residues in the product; in addition, the microfiber opening process requires the use of a large amount of hot toluene. Causes toluene emissions an...

AI Technical Summary

Problems solved by technology

[0002] The production process of traditional solvent-based microfiber synthetic leather is impregnated with solvent-based polyurethane resin. The solidification process includes impregnation of superfine fiber non-woven fabric with solvent-based polyurethane slurry, DMF aqueous solution coagulation bath, water washing, drying, toluene reduction, water washing, Drying and other steps, the production process uses a large amount of organic solvent N,N dimethylformamide (DMF), which will cause a large amount of DMF emissions and DMF residues in the product; in addition, the microfiber opening process requires the use of a large amount of hot toluene. Causes toluene emissions and toluene residues

In recent years, the use of water-based microfiber synthetic leather impregnated with water-based polyurethane resin, the weight reduction process (dissolving or decomposing the sea phase process) uses hot alkali aqueous solution to decompose the easily hydrolyzed polyester component, which can completely eliminate the use of organic solvents; however, due to The impregnation of water-based polyurethane has not gone through the coagulation and foaming process of traditional solvent-based superfine fiber synthetic leather. After drying, the water-based polyurethane is wrapped in sheets on the surface of the microfiber, resulting in difficult and incomplete weight reduction, hard and empty hand feeling, The drape feeling is poor, the grade is relatively low, and it is quite different from the traditional solvent-based toluene-reduced microfiber leather