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A method of clean high-absorption chrome tanning

A high-absorption and clean technology, applied in the field of clean tanning, can solve the problems of cumbersome operation, increased production cost, and reduced leather quality, and achieve the effects of improved effect, reduced production cost, and high absorption

Inactive Publication Date: 2007-05-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are either cumbersome to operate, or because the use of auxiliary tanning agents or other materials leads to increased production costs, or reduced leather quality, etc., and cannot be accepted by large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The pig skins finished with routine depilation and liming are washed and delimed according to the routine;

[0029] (2) The bare hide after deliming is treated with 2% sodium chloride and 7% anhydrous sodium sulfate in a drum for 30 minutes without a bath, squeezed, split, and evenly peeled according to conventional methods;

[0030] (3) Weigh the split or peeled skins, wash them in drums for 20-30 minutes, and soften and wash them with conventional methods according to the difference of raw hides and leather varieties;

[0031] (4) pickling, water 50%, salt 4%, formic acid 0.5%, sulfuric acid 0.6%, amino resin tanning agent 0.5%, time 60min, end pH3.2;

[0032] (5) Chrome tanning, carried out in pickling solution, the amount of chrome tanning agent is based on Cr 2 o 3 The calculation is 1.4%, the alkalinity is 33%, the time is 120min, and 1.0% sodium acetate is added for 70min;

[0033] (6) Elevate alkali, add 1.0% baking soda to adjust the pH of the tanning so...

Embodiment 2

[0035] (1) The cow hides finished with conventional depilation and liming are washed and delimed in accordance with conventional methods;

[0036] (2) The bare hide after deliming is treated with 3% sodium chloride and 5% anhydrous sodium sulfate in a drum for 50 minutes without a bath, squeezed, split, and evenly peeled according to conventional methods;

[0037] (3) Weigh the split or peeled skins, wash them in drums for 20-30 minutes, and soften and wash them with conventional methods according to the difference of raw hides and leather varieties;

[0038] (4) pickling, water 80%, salt 5%, acetic acid 1.0%, sulfuric acid 0.4%, amino resin tanning agent 1.5%, time 90min, end pH3.6;

[0039] (5) Chrome tanning, carried out in pickling solution, the amount of chrome tanning agent is based on Cr 2 o 3 The calculation is 1.6%, the basicity is 25%, the time is 150min, and 0.8% sodium formate is added to treat for 90min;

[0040] (6) Add alkali, add 0.4% magnesium oxide to adju...

Embodiment 3

[0042] (1) The sheep skins finished with conventional depilation and liming are washed and delimed in accordance with conventional methods;

[0043](2) The bare hide after deliming is treated with 3% sodium chloride and 6% anhydrous sodium sulfate in a drum for 40 minutes without a bath, squeezed, split, and evenly peeled according to conventional methods;

[0044] (3) Weigh the split or peeled skins, wash them in drums for 20-30 minutes, and soften and wash them with conventional methods according to the difference of raw hides and leather varieties;

[0045] (4) pickling, water 100%, salt 6%, acetic acid 0.8%, sulfuric acid 0.5%, amino resin tanning agent 0.7%, time 70min, finish pH3.3;

[0046] (5) Chrome tanning, carried out in pickling solution, the amount of chrome tanning agent is based on Cr 2 o 3 The calculation is 1.1%, the basicity is 35%, the time is 60min, and 0.5% sodium formate is added for 60min;

[0047] (6) Elevate the base, add 0.7% calcium carbonate to a...

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Abstract

This invention is a method of sanitary high-absorption chrome tanning. Its character is using treated waste water releasing from tannery instead of tap water and well water in the whole process. In the prophase, tanning cutting technique is utilized. In the acid soaking process, it is treated with amino resin tanning agent.

Description

1. Technical field [0001] The invention relates to a clean high-absorption chrome tanning method, which belongs to the field of clean leather-making methods. 2. Background technology [0002] Since the chrome salt tanning method was put into industrial production, its excellent performance has always been in the dominant position in leather tanning. So far, there is no tanning method that can fully achieve the effect of chrome tanning. But existing chrome tanning process still has not enough, one chrome tanning agent utilization rate is low, conventional method only has about 70% chromium to be absorbed, utilize (Li Yanchun, China Leather, 2001,30 (23)); A large amount of by-products containing chromium and waste tanning liquor with high chromium content have caused serious pollution to the environment. Due to the shortage of chromium resources in our country, reducing the use of chromium, improving the absorption and utilization of chromium, and curbing or eliminating the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/06
Inventor 王坤余
Owner SICHUAN UNIV
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