Formula and production technology of artificial waterborne polyurethane foamed synthetic leather

Abstract

The invention discloses a formula of artificial waterborne polyurethane foamed synthetic leather, which comprises a thick foam coating liquid, a surface processing agent, and a rotary screen printing coating, wherein the surface processing agent includes a highlight surface processing agent or a delustring surface processing agent. Production technology of the artificial waterborne polyurethane foamed synthetic leather includes: preparing the thick foam coating liquid and the surface processing agent, putting leather-based cloth on a frame, performing ironing and drying, making the thick foam coating liquid into coating foam through an intelligent dynamic foam generator, coating the leather-based cloth with the coating foam, performing drying through an oven after the coating is completed to obtain a semi-finished product, performing calendaring, uniformly applying the surface processing agent with a printing roller, performing drying through an oven, performing embossing, then performing printing, and performing trimming, cooling and rolling. The produced waterborne foamed synthetic leather touches like real leather, is good in scratch resistance, and is waterproof and breathable. The synthetic leather allows embossing and printing to be performed, and can replace real leather and oily synthetic leather. The production technology is simple, is free of pollution or discharge, and is good in environmental protection.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of synthetic leather production, in particular to the technical field of the formulation and production process of artificial leather water-based polyurethane foamed synthetic leather. [0003] 【Background technique】 [0004] As a major producer of artificial leather and synthetic leather, my country is facing increasing pressure while the output of enterprises and total industrial output value are growing steadily, especially for exporting to the European market. The European Chemicals Agency officially announced the eighth batch of candidate list of substances of very high concern, including N,N-dimethylformamide (DMF). The promulgation of this regulation has once again put forward a severe test for synthetic leather manufacturers. [0005] my country's production enterprises basically use traditional solvent-based polyurethane resins to manufacture synthetic leather. Most of the solvents used as ...

AI Technical Summary

Problems solved by technology

These solvents cannot be completely recovered at present, not only causing environmental pollution on the product side, but also seriously endangering the health of employees during the production process

[0006] It has become a development trend for water-based synthetic leather to replace traditional oil-based synthetic leather. Now a large number of so-called water-based synthetic leathers have emerged on the market, but generally speaking, these water-based synthetic leathers are not ecological water-based synthetic leathers that can really replace oil-based synthetic leather. ①Many manufacturers Products that use water-based polyurethane dry veneers on oily basses are used as water-based synthetic leathers; Salt (CaCl 2 ) solidified in brine, and then washed repeatedly and dried to make semi-finished products (Beth), and then finished to make water-based synthetic leather. This process produces a large amount of industrial wastewater in the production process, and the direct formula causes environmental pollution. High energy consumption, poor production controllability, high recycling cost, unstable product quality, and immature technology; ③ There are also some dry processes that use release paper transfer, which applies water-based polyurethane slurry to the release liner On the paper, the foam layer, adhesive layer, and surface layer are transferred to the leather base cloth three times, the cell stability and uniformity are poor, the crease resilience of the coating, the pattern retention and shaping of the coating after kneading with water The performance needs to be improved, the release paper is permeable on one side, the drying speed is slow, the production efficiency is low, and the large use of release paper will lead to an increase in production costs

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