Unlock instant, AI-driven research and patent intelligence for your innovation.

White leather tanning agent and production method thereof

A leather tanning agent and tanning agent technology, applied in the field of chrome-free tanning agent and its synthetic production process, can solve the problems of poor thermal stability of chrome-free main tanning agent, achieve the effects of prolonging the shelf life, realizing industrialized production, and being easy to obtain

Active Publication Date: 2012-06-06
德瑞(常州)特种材料有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an improved solution for the poor thermal stability of chrome-free main tanning agent products caused by the prior art, so as to promote the early realization of industrial production of this type of products

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The first step: Add 61kg of alcohol amine into a reactor equipped with stirring, thermometer, reflux condenser and vacuum distillation device;

[0027] The second step: heating up to 30-40℃;

[0028] The third step: add 30kg paraformaldehyde dropwise;

[0029] The fourth step: add 1kg of sodium borate solution and keep it for 2 hours after the addition;

[0030] Step 5: Perform vacuum distillation at a temperature of 50-90°C and a pressure of -0.3bar-0.95bar for 6 hours to remove water, and obtain a colorless to light yellow finished product, which can be stored at room temperature.

Embodiment 2

[0032] The first step: add 61kg of alcohol amine into the reaction kettle with stirring, thermometer, reflux condenser and vacuum distillation device;

[0033] The second step: heating up to 30-40℃;

[0034] The third step: add 2kg sodium borate solution;

[0035] The fourth step: add 46kg of acetaldehyde dropwise and keep it warm for 4 hours after the addition;

[0036] Step 5: Perform vacuum distillation at a temperature of 50-90°C and a pressure of -0.3bar-0.95bar for 4 hours to remove water, and obtain a colorless to light yellow finished product, which can be stored at room temperature.

Embodiment 3

[0038] The first step: add 61kg of alcohol amine into the reaction kettle with stirring, thermometer, reflux condenser and vacuum distillation device;

[0039] The second step: heating up to 30-40℃;

[0040] The third step: add 1.2kg of boric acid, add 0.8kg of sodium hydroxide (95%) after stirring evenly;

[0041] Step 4: Add 100kg of glutaraldehyde dropwise, and keep it warm for 4 hours after the addition;

[0042] Step 5: Perform vacuum distillation at a temperature of 50-90°C and a pressure of -0.3bar-0.95bar for 4 hours to remove water, and obtain a colorless to light yellow finished product, which can be stored at room temperature.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a chromium-free tanning agent in the tanning industry and a synthetic production process thereof; the formula (weight ratio) comprises: 60-150 parts of amide containing hydroxymethyl, 30-100 parts of aliphatic aldehydes, and 1-5 parts of anti-yellowing agent. The production method comprises the following steps: in the first step, 60-150 parts of amide containing hydroxymethyl are added into a reaction kettle with a stirring function, a thermometer, a reflux condenser and a vacuum distillation unit; in the second step, temperature is raised to 30 to 40 DEG C; in the third step, 30-100 parts of aliphatic aldehydes are dripped; in the fourth step, 1-5 parts of anti-yellowing agent are added with 2-4 hours of heat insulation; and in the fifth step, decompression distillation is carried out for 4-6h at the temperature of 50-90 DEG C and the pressure of -0.3bar-0.95bar for removing the water. The third step and the fourth step can be exchanged. The invention solves the color changing problem in the production and storage processes of the products, adds a small amount of anti-yellowing material alkali metal and the borate solution of alkaline earth metal, greatly improves the storage conditions of the 'oxazolidine' type tanning agent, and prolongs the quality guaranteeing time; as the anti-yellowing material has low price, is easy for acquisition, and has small adding amount, the invention does not affect the application characteristics of the products and can be widely promoted.

Description

Technical field [0001] The invention relates to a chrome-free tanning agent in the leather industry and its synthetic production process, and belongs to the technical field of fine chemicals. Background technique [0002] At present, wet blue leather made by chrome tanning is still the mainstream of the leather industry, and no material can completely replace chrome powder. However, as human beings pay more and more attention to the environment and health, the large amount of unabsorbed trivalent chromium and hexavalent chromium in the chrome tanning process has attracted more and more attention to humans and organisms and gene mutations. Therefore, after the 1970s, The research on the substitutes of various chrome tanning agents has always been a research topic for governments and scientific research units of various countries. At present, the commonly used substitutes for chrome tanning agents are: [0003] 1. Other metal tanning agents (iron tanning, aluminum tanning, zirconium...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
Inventor 刘晓明郑融李靖吴庆波
Owner 德瑞(常州)特种材料有限公司