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Method for ash-free and no-sulfurizing alkaline liming treatment for making pigskin leather

A technology of alkali sulfide and pigskin, applied in chemical treatment of small raw hide/large raw hide/leather hide/fur, small raw hide/large raw hide/leather/fur treatment, chemical treatment before tanning, etc., can solve the problem of excessive elongation , loose surface, tube wrinkle and other problems

Inactive Publication Date: 2007-01-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the finished leather is soft and inelastic, with poor hand feeling, excessive elongation, poor strength, thick and long fluff, and even defects such as loose surface and tube wrinkle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: pigskin suede garment leather technology

[0031] (1) Immersion

[0032] The raw hides are weighed and washed with water, and the water is controlled. Take 100 kg of rawhide and put it into the drum, add 150 kg of water at 20°C, 2 kg of ammonium bicarbonate into the drum, rotate for 30 minutes, adjust the pH of the solution to 8.0, then add 0.6 kg of anionic degreasing agent and mixed enzyme 0.5 kg, rotate for 120 minutes, stop soaking for 12 hours, drain, add 3 kg of salt, 0.2 kg of preservative, rotate for 20 minutes, and let out the drum.

[0033] (2) Enzyme hair removal

[0034] Take 100 kg of rawhide, 0.2 kg of mixed enzyme, 0.5 kg of 1398 protease, 7 kg of sawdust, 10 kg of water, mix thoroughly, brush on the back of the buttocks with a brush, stack for 42 hours, keep the pH value at 7.8, and push the hair by machine.

[0035] (3) Expansion

[0036] Take 100 kg of fur and put it into the drum, add 120 kg of water at a temperature of 20 °C, 1.5 kg...

Embodiment 2

[0041] Embodiment 2: pigskin upper leather technology

[0042] (1) Immersion

[0043] The raw hides are weighed and washed with water, and the water is controlled. Take 100 kg of raw hide and put it into the drum, add 150 kg of water at 22 ° C, 2.5 kg of ammonium bicarbonate into the drum, rotate for 25 minutes, adjust the pH of the solution to 7.8, then add 0.4 kg of anionic degreasing agent and mixed enzyme 0.3 dry grams, rotate for 150 minutes, stop soaking for 10 hours, drain, add 5 kg of salt, 0.3 kg of preservatives, rotate for 30 minutes, and let out the drum.

[0044] (2) Enzyme hair removal

[0045] Take 100 kg of raw hide, 0.4 kg of mixed enzyme, 0.3 kg of 1398 protease, 6 kg of sawdust, 12 kg of water, mix thoroughly, brush on the back of the buttocks with a brush, pile up for 36 hours, keep the pH value at 8.5, and push the hair by machine.

[0046] (3) Expansion

[0047] Weigh the push fur, take 100 kg, put it into the drum, add 100 kg of water with a temperat...

Embodiment 3

[0052] Embodiment 3: Pigskin front garment leather technology

[0053] (1) Immersion

[0054] The raw hides are weighed and washed with water, and the water is controlled. Take 100 kg of rawhide and put it into the drum, add 150 kg of water with a temperature of 18 ℃, 3 kg of ammonium bicarbonate into the drum, rotate for 20 minutes, adjust the pH value of the solution to 8.5, then add 0.3 kg of anionic degreasing agent and mixed enzyme 0.4 kg, rotate for 130 minutes, stop soaking for 11 hours, drain, add 4 kg of salt, 0.4 kg of preservative, rotate for 25 minutes, and let the drum out.

[0055] (2) Enzyme hair removal

[0056] Take 100 kg of raw hide, 0.3 kg of mixed enzyme, 0.4 kg of 1398 protease, 5 kg of sawdust, 15 kg of water, mix thoroughly, brush on the back of the buttocks with a brush, pile up for 40 hours, keep the pH value at 8.0, and push the hair by machine.

[0057] (3) Expansion

[0058] Weigh the push fur, take 100 kg, put it into the drum, add 150 kg of w...

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Abstract

The no-ash and no-sodium sulfide liming process for making pigskin leather features its greatly reduced pollution, and no use of pollutant sodium sulfide, sodium hydrosulfide and lime makes it easy to treat exhausted waste water. Compared with conventional technological process, the present invention has the advantages of no deposit, reduced waste water exhaust, short production period, saving in material and lowered comprehensive cost.

Description

technical field [0001] The invention relates to a method for ashless and alkali-sulfurized liming treatment of pigskin leather, which belongs to the field of leather tanning. The method is applicable to the liming treatment before tanning of pigskin garment leather and shoe upper leather currently demanded in the market. Background technique [0002] The importance of liming treatment has long been recognized by the tanning industry, that is, "good leather comes out of the ash tank", and the effect of liming directly affects the subsequent process of tanning and the quality and performance of the finished leather. If raw hides in the traditional tanning and liming process are not fully and uniformly expanded during liming, and the collagen fibers are not separated and loose enough, the finished leather will be flat, thin, stiff and brittle. If the liming is excessive, due to excessive water filling, the thickness and volume will increase too much, and the bare skin will be ...

Claims

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Application Information

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IPC IPC(8): C14C1/06
Inventor 单志华陈慧张松林卓学石碧
Owner SICHUAN UNIV
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