Amphoteric fatliquoring agent for ecological leather manufacture and preparation method thereof

Abstract

The invention belongs to the technical field of leather fatliquor, and specifically relates to an amphoteric fatliquor for ecological leather manufacture and a preparation method thereof, comprising: (1) dissolving polyethylene polyamine in a solvent, cooling the temperature to 0-5°C, adding Long-chain alkylsulfonyl chloride, stirred and reacted; added ether, raised the temperature to 30°C and stirred for 8-12 hours; after the reaction, poured the reaction solution into ice water, and adjusted the pH of the reaction solution to 6.5-7.5 to obtain system 1; (2) Add long-chain fatty acid in system 1 and mix evenly, add the first catalyst, react at 120-150° C. for 4-10 hours, obtain system 2 after cooling, and obtain cationic intermediate after system 2 is washed and dried; (3 ) dissolving the cationic intermediate in water, adjusting the pH value to 3.5-5.5, adding 2-hydroxyethyl acrylate and a second catalyst, and reacting at 40-60°C for 3-5 hours to obtain an amphoteric fatliquoring agent; The invention realizes the stable and efficient combination of fatliquoring agent and crust leather through reasonable selection of materials and optimized control of the preparation process.

Description

technical field [0001] The invention belongs to the technical field of leather fatliquor, and in particular relates to an amphoteric fatliquor for ecological leather manufacture and a preparation method thereof. Background technique [0002] Manufacture of ecological leather and its products is the most important strategic goal of the leather industry at home and abroad. The chrome tanning method has always been the dominant tanning method in the leather industry because of its excellent leather-forming performance, but it is easy to cause problems such as excessive chromium content in wastewater and chromium-containing solid waste, which has potential environmental risks. Therefore, implementing chrome-free tanning and eliminating chrome pollution from the source is the most important development direction for ecological tanning, and it is also the focus of scientific and technological competition in the international leather field. [0003] The implementation of chrome-fr...

AI Technical Summary

Problems solved by technology

These tanning agents all use formaldehyde as the basic synthetic raw material, so formaldehyde will be continuously released during the tanning process, which will easily lead to excessive free formaldehyde content in leather / fur products

In addition, the molecules of these tanning agents are generally small, the active group is single, and the tanning performance is insufficient

Another problem is that because these tanning agents mainly react with the amino group of skin collagen, the isoelectric point of the leather base will be significantly lowered, resulting in a low binding rate of subsequent dyeing and finishing materials (currently generally anionic materials), so that the finished leather There is a big gap between the quality and chrome tanned leather

In 2010, Clariant launched a formaldehyde-free organic tanning agent F-90, but the shrinkage temperature of the tanned leather was low (Ts=72°C), and the tanning agent’s small molecule and single group had not been improved. Therefore, the quality of finished leather still has a large gap with chrome tanned leather

Because the fatliquoring agent modified by natural oil will produce a large amount of waste liquid, the utilization rate of oil is low, and the fatliquoring waste liquid will pollute the environment

Fatliquor prepared from mineral oil and paraffin still has problems such as insufficient fullness, poor elasticity, and single function after leather is treated