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Chrome free or less chrome main tanning agent for leather and preparation process thereof

A main tanning agent, leather technology, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, paint containing biocide, etc., can solve the problem of chrome-free leather tanning It solves the problems of complex synthesis process, high price, unacceptable and other problems, and achieves the effect of improving damp-heat stability and mechanical properties, low price and many varieties.

Inactive Publication Date: 2004-01-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of chrome-free leather tanning agent has complex synthesis process, single variety and high price (80-90 yuan / kg), which is difficult to accept in the domestic market.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] 1. Put 105Kg of diethanolamine, 58Kg of glyoxal, and 0.5Kg of sodium hydroxide into a reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and react at a temperature of 70-80°C for 6-8 hours. 90°C, 70-100mmHg column, dehydration for 2 hours, add 3.5Kg acetic anhydride, continue dehydration, ring closure reaction for 2 hours, lower the temperature by 40-45°C, and discharge. The obtained product has an effective content of 97-98%, a closed-loop rate of about 96%, and an aldehyde content of 9.2%. Its chemical structural formula is:

[0032] 2. Add 65Kg of alcohol amine, 22.5Kg of paraformaldehyde, and 0.4Kg of potassium hydroxide to the same reaction equipment as in Example 1, react at a temperature of 50-70°C for 2 hours, add 25Kg of glutaraldehyde, and 0.35 kg of potassium hydroxide. Kg, continue the reaction at a temperature of 50-70°C for 3.0 hours, dehydrate at a temperature of 80-90°C, 60-100mmHg column for 2 hours, add 5.5Kg maleic anhydr...

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Abstract

The leather tanning agent having no chrome or having little chrome is made up by using amine material containing carboxymethyl group and aliphatic aldehyde compound through the processes of N-carboxymethylation reaction and ring-closing reaction. In addition to oxazolidine naphthenicbase its molecular structure also contains several functional groups of aldehyde group, carboxyl group, hydroxyl group and quaternary amino-group. Said main tanning agent can be combined with vegetable tannin extract, also can be combined with chrome for tanning leather, and can raise wet and thermal stabilizing of the finished leather and reduce dose of chrome by 30-40%.

Description

1. Technical field [0001] The invention relates to a chrome-free or low-chrome main tanning agent for leather and a preparation method thereof, which belongs to the field of synthesis of low-molecular substances. 2. Background technology [0002] Because of its special electronic layer structure, chrome has the characteristics of good softness, extensibility, heat resistance stability and water vapor permeability after tanning. Since the establishment of the one-bath chrome tanning method in 1893, it has been widely used. For the production of leather, it has developed into the dominant tanning method. However, since the utilization rate of chromium salt in the current chrome tanning method is only 65% ​​to 75%, the direct discharge of a large amount of unabsorbed waste chrome liquid will cause the Cr contained therein to +3 and Cr +6 It has carcinogenic and gene mutation effects on humans and organisms, and has caused serious environmental pollution. The world's chromium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/14C14C3/00C14C3/08C14C3/16
Inventor 范浩军石碧李玲李亚栾世方王利军
Owner SICHUAN UNIV
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