Environment-friendly collagen fiber leather substrate and production method thereof

Abstract

At present, researchers do the research of reasonable utilization of chrome-containing leather shavings all the time; however, the leather shavings of leather making enterprises are difficult to treat in batch. The invention provides an environment-friendly collagen fiber leather substrate which is characterized by comprising an intermediate-layer fiber web, a surface-layer fiber web tightly connected on the upper surface of the intermediate-layer fiber web, and a bottom-layer fiber web tightly connected on the lower surface of the intermediate-layer fiber web, wherein the surface-layer fiberweb and the bottom-layer fiber web respectively comprise the components by mass percentage of: 90 to 97 percent of collagen fibers, 3 to 10 percent of polylactic acid bi-component fibers; the intermediate-layer fiber web is made of polylactic acid bi-component fibers; the weight of the surface-layer fiber web and the weight of the bottom-layer fiber web are both 30 to 150 grams per square meter; and the weight of the intermediate-layer fiber web is 10 to 30 grams per square meter. The non-woven synthetic leather substrate prepared by using collagen fiber extracted from leather leftovers has good simulation performance, avoids secondary pollution to the environment, and is beneficial to the follow-up coating of PU (polyurethane).

Description

technical field [0001] The invention relates to a synthetic leather base cloth used in clothing and home textile industries, in particular to an environment-friendly collagen fiber leather base cloth. Background technique [0002] The traditional tanning industry uses animal skin as the basic raw material, and the finished product only accounts for about 50% of the original skin weight, and the rest is a large amount of solid waste. As a big country in tanning, my country produces about 1.4 million tons of leather corner waste (mainly chrome-containing leather waste) every year, accounting for almost one-half of the world's total. Therefore, the proportion of chromium-containing scraps is relatively high, so there is a phenomenon that while the leather industry is developing rapidly, the amount of leather waste is also increasing, which makes my country's leather industry face the severe challenge of sustainable development and increasingly serious environmental pollution pro...

AI Technical Summary

Problems solved by technology

[0007] In a word, because the chemical method is carried out in the laboratory, and the operation is flexible and convenient, it has achieved good results in the treatment of chromium-containing waste in theory, but in practical application, the products supported by the chemical method are often not very good. The main reason is that the processing process is complicated, there is secondary pollution and the utilization rate of leather shavings is low, so researchers have been doing research on the rational use of chromium-containing shavings for many years, but the leather shavings of tanning enterprises are still It is difficult to be processed in batches, so it is very important to extract collagen fibers of appropriate length from leather waste to produce high value-added products to achieve the purpose of mass utilization of chromium-containing leather waste without causing secondary pollution to the environment