Ecological environment-friendly vegetable tanning yellow cattle upper leather production process

Abstract

The invention relates to the technical field of leather manufacturing, and provides an ecological environment-friendly vegetable tanning yellow cattle upper leather production process. According to the ecological environment-friendly vegetable tanning yellow cattle upper leather production process, an organic pre-tanning agent is used for pretreating softened leather, the tanning agent based on avegetable tanning agent is used for tanning, wherein the vegetable tanning agent is mainly a condensed vegetable tanning agent, and then an aldehyde tanning agent is combined for retanning; the vegetable tanning agent, collagen, the aldehyde tanning agent can form cross-linking to produce a vegetable-aldehyde synergistic tanning effect, the fixation effect of the vegetable tanning agent is improved to improve the absorptivity of the vegetable tanning agent, the washing resistance, organic agent resistance performance and shrinkage temperature of the obtained green leather are improved, and thedistribution of vegetable tanning agent on each layer of green leather is more uniform; and the green leather has fine grain size, good compactness, good softness, good fullness and good elasticity,and accords with the characteristics of upper leather products.

Description

technical field [0001] The invention relates to the technical field of tanning chemistry and engineering, in particular to an ecological and environment-friendly vegetable tanned yellow cattle upper leather production process. Background technique [0002] 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 method and has dominated leather production. An essential process in leather production. However, when the chrome tanning agent is used for tanning or retanning, it cannot be completely absorbed by the collagen fiber of the skin, and 20-35% of the chromium is discharged with the waste water, causing certain pollution to the environment, and the treatment of the waste water cont...

AI Technical Summary

Problems solved by technology

In the vegetable tanning method, since the vegetable tanning agent itself is a natural polyphenol product modified by sulfitation, it has good water solubility, and the combination of the vegetable tanning agent and skin collagen is mainly through the interaction of hydrogen bonds and hydrophobic bonds. The bonding ability is relatively weak, and the washing resistance is not good, especially under the condition of high temperature and mechanical force, the bonding force is easily destroyed. Turning for a certain period of time, the vegetable tanning agent is easy to migrate out of the leather, the tanning effect is low, and the physical properties of the tanned leather are reduced