Deashing-softening-pickling integrated clean tanning method and application thereof

A pickling and deliming technology, which is applied in application, chemical treatment before tanning, small hide/big hide/leather/fur treatment, etc. It can solve problems such as pollution, unstable softening effect, ammonia nitrogen pollution, etc., and simplify the process flow , Eliminate pollution and toxicity problems, reduce the effect of water consumption

Active Publication Date: 2022-01-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a deliming-softening-pickling integrated clean tanning method in view of the deficiencies in the prior art, so as to realize efficient softening and pickling without using ammonium salt and neutral salt in the tanning preparation section. Tanning with high absorption of chromium to solve the problems of ammonia nitrogen pollution and unstable softening effect in the deliming and softening process of conventional tanning, as well as chloride ion pollution in the conventional pickling process, and can reduce the emission of chromium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1—Cowhide shoe upper leather deliming-softening-pickling integrated clean tanning method

[0024]Take 100 kg of the top layer of yellow cowhide after soaking in water, dehairing, liming, and peeling according to the conventional method (based on the mass of the top layer of gray hide after peeling) and put it into the drum, add about 30 kg of water, and adjust the temperature to 30 ° C. Add 1.5 kg of ammonia-free dealkalizing agent DLA (compound acid, without ammonium salt and boric acid, Sichuan Dawei Technology Co., Ltd.), 0.5 kg of formic acid, and rotate for 90 minutes, pH 6.5-7.5. Wash once with water, 200% water, 20 minutes. Add about 50 kg of water, adjust the temperature to 25°C, add 3.0 kg of sulfonesulfonic acid (non-expanding acid), rotate for 60 minutes, and the pH is 4.0-5.0. Add acid protease P-LKT-A (Shandong Longket Enzyme Preparation Co., Ltd.) 0.5 kg, carbohydrase G-LKT-A (Shandong Longket Enzyme Preparation Co., Ltd.) 0.2 kg, lipase L-LKT-A (...

Embodiment 2

[0030] Example 2 - Cowhide sofa leather deliming-softening-pickling integrated clean tanning method

[0031] Take 100 kg of the top layer of dairy cowhide after soaking in water, dehairing, liming, and peeling according to the conventional method (based on the mass of the top layer of gray hide after peeling) and put it into the drum, add about 30 kg of water, and adjust the temperature to 33 ° C. Add 1.0 kg of ammonia-free dealkalizing agent DLA, 1.5 kg of naphthalene disulfonic acid (non-expanding acid), rotate for 90 minutes, and the pH is 6-7. Wash once with water, 200% water, 20 minutes. Add about 50 kg of water, adjust the temperature to 30°C, add 4.0 kg of naphthalene disulfonic acid (non-expanding acid), rotate for 60 minutes, and the pH is 3.5-4.5. Add acid protease P-AKT-A (Kunming Aikete Biotechnology Co., Ltd.) 1.5 kg, carbohydrase G-LKT-A 0.5 kg, lipase L-AKT-A (Kunming Aikete Biotechnology Co., Ltd.) 1.0 kg , non-ionic surfactant FG-B 0.3 kg, rotate for 60 minu...

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PUM

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Abstract

The invention provides a deliming-softening-pickling integrated clean tanning method, which is characterized in that deliming, enzyme softening and pickling processes in a conventional tanning process are combined, and salty pickling is replaced by salt-free pickling. The method comprises the following steps: adjusting the pH value of limed bare skin to be acidic by using an ammonium-salt-free dealkalizing agent and non-expansive acid, adding an acidic compound enzyme preparation for softening, and adding the non-expansive acid for salt-free pickling in one bath, so as to achieve the purposes of softening and pickling at the same time. According to the method, conventional pancreatin softening is replaced with acidic compound enzyme softening, ammonium salt, boric acid and neutral salt are completely not added, ammonia nitrogen and chloride ion pollution in the procedures of deliming, softening and pickling can be eliminated from the source, and chromium emission can be reduced; the method can effectively avoid the problem of unstable softening effect caused by poor pH buffering property of the conventional ammonia-free softening bath lotion. The method has wide practicability and is suitable for various leather production processes taking various animal skins as raw materials.

Description

technical field [0001] The invention relates to a tanning technology, in particular to an integrated clean tanning method of deashing-softening-pickling, which belongs to the technical field of leather clean production. Background technique [0002] Enzyme softening is an important process in the tanning process. The delimed bare hide is treated with enzyme preparations to further remove scale, fibrous interstitial and loose structural protein fibers. Because the destruction effect of pancreatic enzyme on the collagen fiber of animal hide is relatively weak, it is relatively safe to use, so it has always been the main enzyme used in leather softening. However, there are also some problems in the use of trypsin. For example, the complex components of trypsin products and large differences between batches make it difficult to control the softening effect stably; The role; the price of pancreatic enzymes is high. Moreover, since the optimum pH value of trypsin is 8-9, ammoniu...

Claims

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Application Information

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IPC IPC(8): C14C1/08C14C3/06
CPCC14C1/08C14C3/06
Inventor 彭必雨张旭高蒙初张春晓
Owner SICHUAN UNIV
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