Environmentally-friendly and high-grade sofa leather production process

Abstract

The invention relates to the technical field of leather manufacturing processes, and provides an environmentally-friendly and high-grade sofa leather production process. According to the environmentally-friendly and high-grade sofa leather production process, an organic pretanning agent F-90 is adopted to pretreat softened leather, main tanning is carried out on pre-tanned white wet leather by adopting an aldehyde tanning agent, a vegetable tanning agent, an aromatic synthetic tanning agent, an amino resin tanning agent and an acrylic resin tanning agent are adopted for retanning, cross-linking can be formed among the vegetable tanning agent, collagen and the aldehyde tanning agent, and a vegetable-aldehyde synergistic tanning effect is achieved, so that the water-washing resistance, organic solvent resistance and shrinkage temperature of obtained crust leather are improved; moreover, the environmentally-friendly and high-grade sofa leather production process is a technical skill integrating tanning, neutralization, retanning and dyeing, uniform patterns are easy to produce on the grain surface of obtained sofa leather, and the process is suitable for the mill operation; and the shrinkage temperature is higher than 85 DEG C, and physical and mechanical properties and sensory properties meet the standard of chrome-free tanning leather.

Description

technical field [0001] The invention relates to the technical field of tanning chemistry and engineering, in particular to an environment-friendly high-grade sofa leather production process. Background technique [0002] With the development of social economy, people's living standards are improving day by day. As a representative product to improve people's living standards and quality, furniture has attracted more and more attention. Among them, the leather sofa is a seat made of animal skin, such as pigskin, cowhide, sheepskin and other animal skins, processed by a specific process. In the preparation process of sofa leather, tanning and retanning processes are important processes that determine the basic performance and style of natural leather. Because chrome tanned leather has excellent moisture and heat resistance stability and storage resistance, as well as good physical and mechanical properties and sensory properties, chrome tanning has long been the main tanning...

AI Technical Summary

Problems solved by technology

However, when the chrome tanning agent is used for tanning or retanning, it cannot be completely absorbed by the collagen fibers of the skin, and about 20-35% of the chromium is discharged with the wastewater, causing certain pollution to the environment, and the treatment of chromium-containing wastewater is difficult and costly , which increases the cost of wastewater treatment and brings great pressure on environmental protection to tannery enterprises

At the same time, the trivalent chromium in the chrome tanning agent will be transformed into toxic and harmful hexavalent chromium under certain conditions, making it difficult for the hexavalent chromium content in the leather to meet the requirements of the "Genuine Leather Mark Eco-Leather Product Specification". Therefore, environmental protection The development of the latest sofa leather production technology and process is particularly important. The use of non-toxic or low-toxic leather chemical materials, the use of clean production technology, and the production of green and safe leather products are of great significance to the development and progress of the leather industry.