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Preparation method of formaldehyde-free leather synthetic tanning agent

A technology of formaldehyde and leather, applied in the field of preparation of formaldehyde-free leather syntans, to achieve the effects of good elasticity, good selective filling, good tanning performance and filling effect

Inactive Publication Date: 2010-07-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, green tanning agents with better application performance are relatively rare at present, and green tanning agents with excellent performance that can replace polluting tanning agents such as chrome tanning agents on a large scale are still under research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: 1) Ester-forming reaction: first mix 30 grams of polyethylene glycol 200-800, 5.2 grams of p-hydroxybenzoic acid, 1.0 grams of p-toluenesulfonic acid and 4.8 grams of cyclohexane and heat to 90 ° C, keep warm The esterification reaction obtained polyethylene glycol p-hydroxybenzoate in 2 hours;

[0009] 2) HRP catalyzed copolymerization reaction: 15 grams of polyethylene glycol p-hydroxybenzoate obtained by the ester-forming reaction, 17.2 grams of p-hydroxybenzaldehyde, and 32.6 grams of sodium p-hydroxybenzenesulfonate were added to 100 grams of deionized water and mixed uniformly. Heat to 30°C, then use sodium bicarbonate to neutralize the pH of the system to 7-8, add 10 ml of HRP solution with a concentration of 0.5 g / L, add dropwise 18.6 g of hydrogen peroxide solution with a mass fraction of 30%, and control the dropwise addition The time is 2 hours, and after the feeding is completed, continue the heat preservation reaction for 2.5 hours.

Embodiment 2

[0010] Embodiment 2: 1) Ester-forming reaction: first, mix 33 grams of polyethylene glycol 200-800, 15 grams of p-hydroxybenzoic acid, 1.3 grams of p-toluenesulfonic acid and 6 grams of cyclohexane and heat it to 93° C. Esterification obtained polyethylene glycol p-hydroxybenzoate in 1.8 hours;

[0011] 2) HRP catalyzed copolymerization reaction: 12 grams of polyethylene glycol p-hydroxybenzoate obtained by the ester-forming reaction and 8 grams of p-hydroxybenzaldehyde and 15 grams of sodium p-hydroxybenzenesulfonate were added to 93 grams of deionized water and mixed uniformly and Heat to 30°C, then use sodium bicarbonate to neutralize the pH of the system to 7-8, add 12 ml of HRP solution with a concentration of 0.5 g / L, add dropwise 10 g of hydrogen peroxide solution with a mass fraction of 30%, and control the dropwise addition The time is 1.8 hours, and after the feeding is completed, the heat preservation reaction is continued for 3 hours.

Embodiment 3

[0012] Embodiment 3: 1) Ester forming reaction: first mix 35 polyethylene glycol 200~800, 22.8 grams of p-hydroxybenzoic acid, 1.5 grams of p-toluenesulfonic acid and 7.7 grams of cyclohexane and heat to 100 ° C, keep warm for esterification Chemical reaction 1.5 hours obtains polyethylene glycol p-hydroxybenzoate;

[0013] 2) HRP catalyzed copolymerization reaction: 14 grams of polyethylene glycol p-hydroxybenzoate obtained by the ester-forming reaction and 12 grams of p-hydroxybenzaldehyde and 25 grams of sodium p-hydroxybenzenesulfonate were added to 95 grams of deionized water and mixed uniformly and Heat to 30°C, then use sodium bicarbonate to neutralize the pH of the system to 7-8, add 8 ml of HRP solution with a concentration of 0.5 g / L, add dropwise 15 g of hydrogen peroxide solution with a mass fraction of 30%, and control the dropwise addition The time is 1.9 hours, and the heat preservation reaction can be continued for 2.8 hours after the feeding is completed.

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Abstract

The invention relates to a preparation method of a formaldehyde-free leather synthetic tanning agent by enzymatic synthesis. Firstly, p-hydroxybenzoic acid and poly hexanediol are reacted to produce ester, then p-hydroxybenzoic acid macrogol ester, p-hydroxybenzaldehyde and sodium phenolsulfonate are dissolved in deionized water, the pH value of the system is adjusted with a sodium bicarbonate solution, and finally copolymerization is carried out under the catalytic action of horseradish peroxidase (HRP) to obtain the formaldehyde-free leather synthetic tanning agent. Through ester producing reaction and combined polymerization, aldehyde group, carboxyl and phenolic hydroxyl which have tanning effect on leather collagen fibers and polyethylene glycol branched chains, sulfo group and the like which have the functions of penetration, lubrication and filling are introduced into the product structure, and the obtained product has moderate relative molecular weight, good permeability and high absorption rate, and is a pollution-free polymer tanning agent with green performance.

Description

technical field [0001] The invention relates to a preparation method of a leather syntan, in particular to a preparation method of a formaldehyde-free leather syntan. Background technique [0002] Leather tanning agent is a kind of chemical commonly used in the production of leather industry. Leather tanning agent containing formaldehyde is called syntan. Its use can reduce the amount of chrome tanning agent, but it will also cause environmental and water pollution due to the presence of formaldehyde . Therefore, in recent years, the development of formaldehyde-free leather syntans has become a research focus, and formaldehyde-free leather syntans have great market demand and economic benefits. Formaldehyde-free leather synthetic tanning agent has the characteristics of low energy consumption, mild reaction conditions and unique process in the preparation process. The product has good tanning performance. The leather products tanned with this product feel very soft and plum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/38C08G65/48C14C3/22
Inventor 吕生华马艳芬刘岗
Owner SHAANXI UNIV OF SCI & TECH
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