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A method for protecting the grain surface of animal skin in enzymatic depilation

A technology for protecting hides and animal skins, which is applied in small raw hides/big raw hides/leather/fur treatments, small raw hides/big raw hides/leather skins/fur chemical treatments, animal husbandry, etc., and can solve problems such as grain damage of animal skins , to achieve good reversibility and good process compatibility

Active Publication Date: 2022-03-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a new method aiming at the technical problem that the existing enzymatic hair removal method is easy to cause damage to the grain surface of animal skin. The animal skin to be depilated is pretreated with a calcium-containing alkaline solution to protect the grain surface of the animal skin from excessive hair removal enzymes. function, and then obtain leather products with higher grain integrity, and overcome the problems of loose surface and rotten surface that are easily caused by the existing enzyme depilation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1—Pretreatment of cowhide sofa leather after immersion in water, depilation with alkaline protease

[0025] Add 100kg of cowhide presoaked in water to the drum, add 300kg of water, adjust the temperature to about 25°C, add 0.3kg of penetration aid SWA (Chengdu Ruiqi Chemical Co., Ltd.) after enzyme degreasing, fungicide FMC (Chengdu Ruiqi Chemical Co., Ltd. Company) 0.2kg, degreasing agent DW (Sichuan Desaier Chemical Industry Co., Ltd.) 0.2kg and other immersion aids, rotate for 30 minutes, stop the drum for 30 minutes, add 0.3kg of RCB (Beijing Jinbreike Biotechnology Co., Ltd.) and rotate for 30 minutes Stop the drum for 30 minutes to help loosen hair roots, add 0.25kg of lime to introduce calcium ions and control the pH of the bath solution within the range of 12-13, stop the drum overnight, adjust the pH to 10-10.5 the next day, and use LKT alkaline protease (Shandong Longkete Enzyme Preparation Co., Ltd.) depilates under the condition of 80U / mL dosage, rot...

Embodiment 2

[0027] Example 2—Pretreatment of cowhide shoe upper leather before depilation, depilation with neutral protease

[0028] Add 100kg of dairy cowhide that has been conventionally soaked in water to the drum, add 60kg of water, adjust the temperature to about 30°C, add 0.4kg of RCB (Beijing Golden Brick Biotechnology Co., Ltd.) to assist in loosening hair roots, add 0.3kg of lime to introduce calcium ions and control the bath The pH of the liquid is in the range of 12.5-13, stop for 30 minutes, add pickling aid ASA (Beijing Golden Brick Biotechnology Co., Ltd.) to adjust the pH to the range of 7.5-8, use LKT neutral protease (Shandong Longkete Enzyme company) under the condition of 60U / mL dosage, rotate for 5 hours, until only small hairs are left, add 0.6kg of RCB (Beijing Golden Brick Biotechnology Co., Ltd.), add 0.5kg of lime, 0.5kg of sodium hydrogen sulfide, stop for 30min, hair removal After cleaning, add 1kg of expansion agent RCA (Beijing Jinbreike Biotechnology Co., Ltd...

Embodiment 3

[0030] Example 3—Pretreatment of yellow cowhide sofa leather after immersion in water, depilation with alkaline protease

[0031] Add 100kg of pre-soaked yellow cowhide to the drum, add 30kg of water, adjust the temperature to about 15°C, add 0.3kg of fungicide SWK (Chengdu Ruiqi Chemical Co., Ltd.), and 0.3kg of degreasing agent DGC (Chengdu Ruiqi Chemical Co., Ltd.) Wait for the immersion aid, add 0.05kg of RCB (Beijing Golden Brick Biotechnology Co., Ltd.) and rotate for 30 minutes to stop the drum for 30 minutes to assist in loosening the hair roots. Add 80kg of water, add 0.05kg of calcium chloride to introduce calcium ions and control the pH of the bath solution at 12 In the range of -12.5, stop the drum overnight, adjust the pH to the range of 10-11 the next day, use U enzyme (Lanxess Chemical (China) Co., Ltd.) to depilate at a dosage of 60U / mL, and rotate for 2.5h until only small hairs remain , add 0.5kg of lime, 0.5kg of sodium hydrosulfide, turn for 40min, add expans...

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Abstract

The invention discloses a method for pretreating animal skins with a calcium-containing alkaline solution to protect the grain surface from damage before animal skin depilation by enzyme, and relates to the field of leather production. The present invention is characterized in that the calcium solution is used to pretreat the animal skin, so that the calcium ion is combined with the carboxyl group on the skin collagen to endow the collagen with stronger resistance to enzymatic hydrolysis, and then the conventional enzymatic depilation is carried out. This method can effectively protect the collagen fibers of the grain layer of animal skin from excessive action of protease in the process of enzymatic depilation, avoid the occurrence of damage to the grain surface such as loose noodles and rotten noodles, and does not affect the progress of the subsequent sections, effectively improving the quality of the finished leather. quality. The method has wide applicability and is suitable for the production of various leathers using animal skins as raw materials.

Description

technical field [0001] The invention relates to the field of leather processing using animal skins as raw materials, in particular to a method for pretreating animal skins with a calcium-containing alkaline solution to protect the grain surface of the animal skins before enzymatic depilation of the animal skins. Background technique [0002] Tanning is the process of making animal skin into leather with practical properties, and the processing object is the collagen in animal skin. In the conventional tanning process, in order to remove the hair, grease, dirt and other useless things on the animal skin, it is necessary to use excessive lime, sulfide and other necessary additives to treat the animal skin, which will produce a large amount of sulfide, Organic matter, suspended solids and other pollution. Due to the huge environmental protection pressure faced by the tanning industry and the industry's own characteristics, it is particularly important to apply cleaner producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/00C14C1/04C14C1/06
CPCC14C1/00C14C1/04C14C1/06C14C1/065
Inventor 彭必雨田永鑫高蒙初张旭张春晓钟祥
Owner SICHUAN UNIV
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