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Chromium-free leather tanning method

A chrome leather and tanning technology, which is applied in the field of leather preparation, can solve the problems of low leather shrinkage temperature, poor leather tanning effect, and limit the application of chrome-free tanning, and achieve good tanning effect and high shrinkage temperature

Active Publication Date: 2020-05-08
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the chrome tanning method, the chrome-free tanning method has a poorer tanning effect on leather, and the specific performance is that the shrinkage temperature of the leather is still lower, which greatly limits the application of the chrome-free tanning method

Method used

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  • Chromium-free leather tanning method
  • Chromium-free leather tanning method
  • Chromium-free leather tanning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of an organic chlorine tanning agent containing a salicylic acid structure, comprising the following steps:

[0020] Step 1: 60g deionized water and 15.3g 4-aminosalicylic acid are added to the reaction vessel and stirred and mixed, and the first mixed solution is formed after mixing; then the pH of the first mixed solution is adjusted with 20% aqueous sodium bicarbonate solution Adjust to 6.5~7.0;

[0021] Step 2: Under the condition that the temperature is 0° C., 18.4 g of cyanuric chloride is added to the first mixed solution for reaction, and at the same time, the pH of the reaction system is adjusted to 6.0 to 6.5 with 20% aqueous sodium bicarbonate solution, and the reaction The time is 5 hours, and the organic chlorine tanning agent is obtained after the reaction is completed.

[0022] The structural formula of the 4-aminosalicylic acid is

[0023] The structural formula of the cyanuric chloride is

[0024]

[0025] The structural for...

Embodiment 2

[0030] A preparation method of an organic chlorine tanning agent containing a salicylic acid structure, comprising the following steps:

[0031] Step 1: 60g of deionized water and 15.3g of 3-aminosalicylic acid are added to the reaction vessel and stirred and mixed, and the first mixed solution is formed after mixing; then the pH of the first mixed solution is adjusted with 20% sodium carbonate aqueous solution to 6.5~7.0;

[0032] Step 2: Under the condition that the temperature is 0°C, 18.4g of cyanuric chloride is added to the first mixed solution for reaction, and at the same time, the pH of the reaction system is adjusted to 6.0-6.5 with 20% aqueous sodium carbonate solution, and the reaction time is For 5h, the organic chlorine tanning agent is obtained after the reaction.

[0033] The structural formula of 3-aminosalicylic acid is

[0034]

[0035] The structural formula of organic chlorine tanning agent is

[0036]

[0037] Its reaction formula is:

[0038] ...

Embodiment 3

[0040] A preparation method of an organic chlorine tanning agent containing a salicylic acid structure, comprising the following steps:

[0041] Step 1: 60g deionized water and 15.3g 5-aminosalicylic acid are added to the reaction vessel and stirred and mixed, and the first mixed solution is formed after mixing; then the pH of the first mixed solution is adjusted with 20% potassium hydroxide aqueous solution Adjust to 6.5~7.0;

[0042] Step 2: Under the condition that the temperature is 0° C., 18.4 g of cyanuric chloride is added to the first mixed liquid for reaction, and at the same time, the pH of the reaction system is adjusted to 6.0 to 6.5 with 20% potassium hydroxide aqueous solution, and the reaction The time is 5 hours, and the organic chlorine tanning agent is obtained after the reaction is completed.

[0043] The structural formula of 5-aminosalicylic acid is

[0044]

[0045] The structural formula of organic chlorine tanning agent is

[0046]

[0047] Its...

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Abstract

The invention discloses a chrome-free leather tanning method. The chrome-free leather tanning method comprises three steps of deacidification, organic chlorine tanning agent tanning and aluminum tanning. The method comprises the following steps: deacidifying pickled skin; adding an organic chlorine tanning agent to carry out first tanning treatment on leather, wherein the structural formula of theorganic chlorine tanning agent is that the substituent group 4,6-dichloro-1,3,5-triazine-2-amine group is located at the ortho position, meta position or para position of salicylate hydroxyl, and M is H, Na or K; after tanning with the organic chlorine tanning agent, adding an aluminum tanning agent to further tanning leather, wherein aluminum sulfate is selected on the aluminum tanning agent. Inthe tanning process of the invention, no chromium-containing substance is used, chromium pollution is not generated, and the whole tanning process is more green and environment-friendly; at the sametime, the chrome-free leather tanning method has good tanning effect on the leather, and the shrinkage temperature reaches above 95 DEG C or above.

Description

technical field [0001] The invention relates to the field of leather preparation, in particular to a chrome-free leather tanning method. Background technique [0002] Leather has been one of the materials used by humans for warmth and decoration since ancient times, and because different animal skins have different toughness and softness. In order to make the leather more flexible and thus more suitable for decoration and wearing, those skilled in the art often use tanning agents to tan the leather. The so-called tanning is the physical and chemical process of turning raw hide into leather through tanning agents, and it is the process in which hide collagen and tanning agents combine to denature raw hides into non-perishable leather. [0003] The tanning of leather is generally carried out in a drum, and the tanning method varies according to the variety of leather. Among them, the chrome tanning method has the widest application range, is suitable for the production of di...

Claims

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Application Information

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IPC IPC(8): C14C3/28C14C3/26C14C3/04C14C1/00
CPCC14C3/28C14C3/26C14C3/04C14C1/00
Inventor 邹祥龙任便利柴玉叶许晓红沈晓军
Owner WENZHOU UNIVERSITY
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