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Preparation method of half aldehyde type high molecular leather retanning agent

A high-molecular, alkyd-type technology, which is applied in the treatment of small hide/big hide/leather/fur, chemical treatment of small hide/big hide/leather/fur, tanning treatment, etc. It can solve the problem of reducing the amount of chrome tanning agent , poor thickening and other problems

Inactive Publication Date: 2013-08-07
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new preparation method of high-molecular aldehyde acid tanning agent. The prepared leather tanning agent not only overcomes the shortcomings of poor filling and thickening properties of small-molecule aldehyde acid tanning agents in the past, but also can give leather a soft and plump feel. , fine grain, and compared with the polymer aldehyde acid tanning agent announced by CN 1343792A, it has a more significant effect in further reducing the amount of chrome tanning agent and reducing the chromium content in the tanning waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 15.0g itaconic acid and 20.0g distilled water into a 250ml four-necked flask with stirring and condenser, stir and mix evenly, then slowly add 20% sodium hydroxide solution dropwise, adjust the pH to 4, and control during the process The temperature of the reaction liquid was 30°C. Next, 9 g of crotonaldehyde and 6 g of polyoxyethylene ether containing a terminal double bond with a molecular weight of 500 were added to the reaction liquid, and nitrogen was blown to exhaust oxygen and stirred for 20 minutes. Dissolve 0.12g of ammonium persulfate in 10g of distilled water and place it in the feeding tube for later use. The temperature of the reaction solution was raised to 70° C. and ammonium persulfate solution was added dropwise. The dropwise addition was completed within 1.5 hours, and the temperature was kept for 2 hours. Then 0.12 g of ammonium persulfate was dissolved in 40 g of distilled water, and added dropwise to the reaction solution within 15 minutes, and ...

Embodiment 2

[0018] Add 32.0g itaconic acid and 20.0g distilled water into a 250ml four-necked flask with a stirrer and condenser, stir and mix evenly, and then slowly add dropwise sodium hydroxide solution with a concentration of 20%, adjust the pH to 5, and control during the process The temperature of the reaction liquid was 35°C. Then, 4 g of crotonaldehyde and 4 g of polyoxyethylene ether with a molecular weight of 1000 containing terminal double bonds were added to the reaction liquid, and nitrogen was blown through to exhaust oxygen and stirred for 20 minutes. Dissolve 0.4 g of ammonium persulfate in 20 g of distilled water and place it in the feeding tube for later use. The temperature of the reaction solution was raised to 70° C. and ammonium persulfate solution was added dropwise. The dropwise addition was completed within 1.5 hours, and the temperature was kept for 2 hours. Then 0.4g of ammonium persulfate was dissolved in 20g of distilled water, and was added dropwise to the re...

Embodiment 3

[0020] Add 16.0g itaconic acid and 30.0g distilled water into a 250ml four-necked flask with stirring and condenser, stir and mix well, then slowly add 20% sodium hydroxide solution dropwise, adjust the pH to 4.2, and control during the process The temperature of the reaction liquid was 30°C. Then, 2 g of crotonaldehyde and 2 g of polyoxyethylene ether with a molecular weight of 1000 containing terminal double bonds were added to the reaction solution, and nitrogen was blown to exhaust oxygen and stirred for 20 minutes. Dissolve 0.15g of ammonium persulfate in 20g of distilled water and place it in the feeding tube for later use. The temperature of the reaction solution was raised to 70° C. and ammonium persulfate solution was added dropwise. The dropwise addition was completed within 1.5 hours, and the temperature was kept for 2 hours. Then 0.15g of ammonium persulfate was dissolved in 30g of distilled water, and added dropwise to the reaction solution within 15 minutes, and ...

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PUM

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Abstract

The invention relates to a preparation method of a half aldehyde type high molecular leather retanning agent. The half aldehyde type high molecular leather retanning agent is prepared from unsaturated dicarboxylic acid (which accounts for 20 to 90 percent of the weight of monomers), unsaturated aldehyde (which accounts for 3 to 50 percent of the weight of the monomers) and polyethenoxy ether (which accounts for 7 to 30 percent of the weight of the monomers) with terminal double bonds through free radical copolymerization in 1 to 6 times of distilled water. The leather retanning agent gives soft and plumy hand feelings and subtle grain marks to the leather, and in addition, the invention has more obvious effect on further reducing the chromium retanning agent consumption and reducing the chromium content in the leather making waste liquid in the combined retanning preparation with chromium salts.

Description

Technical field [0001] The invention relates to a preparation method of an aldehydic acid tanning agent in the field of leather tanning, in particular to the preparation of a polymer aldehydic acid tanning agent. Background technique [0002] Tanning agent is a chemical material that can play a tanning effect in the leather industry to convert raw hides into leather. Chrome tanning agent is currently the most widely used tanning agent due to its excellent properties, low cost and mature technology. However, in the traditional chrome tanning method, the absorption and utilization rate of chromium by naked skin is relatively low, generally only about 70%. A large amount of unabsorbed chromium compounds are discharged with the tanning wastewater, causing serious pollution to the environment. The aldehydic acid tanning agent is an environmentally friendly tanning agent. It can not only maintain the soft feel of the aldehyde tanning agent, excellent grain, and good sweat resistance, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/22
Inventor 金勇张彪马春彦苗青曹志峰
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI