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Preparing method for aldehyde acid tanning agent

An aldol tanning agent, glyoxylic acid technology, applied in small raw hides/large raw hides/leather/fur treatment, tanning treatment, small raw hides/large raw hides/leather hides/fur chemical treatment, etc., can solve the problem of chromium absorption promotion It can improve the absorption rate and fixation rate, and reduce the chromium content.

Inactive Publication Date: 2006-04-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fan Haojun and others reacted formaldehyde-modified glutaraldehyde with a small amount of amino acid to prepare a condensation product, but since there are only 0.2-0.3 carboxyl groups on average per mole of the condensation product molecule, the promotion effect on chromium absorption is also very small (Fan Haojun , Shi Bi, He Youjie, etc. Development of new aldehyde acid tanning agent. China Leather 1998, 27(2), 11-13)

Method used

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  • Preparing method for aldehyde acid tanning agent
  • Preparing method for aldehyde acid tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: First mix 1 mole of glutaraldehyde with 1 mole of glyoxylic acid aqueous solution, and then add sodium hydroxide catalyst under the protection of nitrogen to make the pH of the system 7.5, heat to 85°C, and keep for 0.5-1.5 hours for reaction. Distill under reduced pressure at 45-65°C or use benzene as a water-carrying agent to reflux for about 1 hour to remove the water produced by the reaction, cool to room temperature, adjust the pH value to 5.5-6.5 with acid, and add water to adjust the solid content of the system to 40%. The structural formula of the condensation product is:

[0007]

Embodiment 2

[0008] Example 2: First, mix 1 mole of glutaraldehyde with 2 moles of glyoxylic acid aqueous solution, and then add sodium hydroxide catalyst under the protection of nitrogen to make the pH of the system 8.5, heat to 45°C, and keep for 0.5-1.5 hours for reaction. Distill under reduced pressure at 45-65°C or use benzene as a water-carrying agent to reflux for about 1 hour to remove the water produced by the reaction, cool to room temperature, adjust the pH to 5.5-6.5 with acid, and add water to adjust the solid content of the system to 40%. The structural formula of the condensation product is:

[0009]

Embodiment 3

[0010] Example 3: First mix 1 mole of glutaraldehyde and 0.5 mole of sodium glyoxylate in an aqueous solution, and then add sodium hydroxide catalyst under the protection of nitrogen to make the pH of the system 8, heat to 55°C, and react at a temperature of 0.5-1.5 Distill under reduced pressure at 45-65°C or reflux under reduced pressure with benzene as a water-carrying agent for about 1 hour to remove the water produced by the reaction, cool to room temperature, adjust the pH value to 5.5-6.5 with acid, and add water to adjust the solid content of the system to 40 %.

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Abstract

A method for preparing aldehydic acid tanning agent is prepared by taking glutaraldehyde, glyoxalic acid and glyoxalic acid metal as raw material, reduced pressure distilling or reverse-flow removing water and synthesizing aldehydic acid tanning agent under protection of nitrogen gas and alkaline catalyst, pre-tanning deliming softening bare skin by the aldehydic acid tanning agent. It achieves good tanning and absorbing performance, and no pollution.

Description

Technical field [0001] The invention relates to a preparation method of an aldehydic acid tanning agent. Background technique [0002] Chrome tanning is the most important tanning method in leather production. During the chrome tanning process, due to the very limited number of active groups on the natural collagen, under the condition of the conventional material ratio, the highest absorption rate of chromium by the bare skin is only 80%, and the fixation rate is only 66%. Residual chromium in the tanning bath (2-3gCr 2 O 3 / l) and after tanning operations, more chromium is washed out of the leather, so that the chromium content in the total tanning sewage is as high as 60-140mgCr / l, which is far higher than the maximum limit (0.05) specified in the national industrial wastewater discharge standards. -10mgCr / l). In addition, the use of sulfuric acid and a large amount of salt for pickling before chrome tanning also makes the neutral salt in the total tanning wastewater seriously...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/16
Inventor 王鸿儒白云翔
Owner SHAANXI UNIV OF SCI & TECH
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