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Efficient enzymatic degreasing method of animal skin

An efficient technology for animal skins, applied in leather degreasing, small raw hides/large raw hides/leather/fur treatment, small raw hides/large raw hides/leather hides/fur chemical treatment, etc. problems, to achieve the effect of small environmental impact, reduced processing difficulty, and improved productivity

Inactive Publication Date: 2017-09-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a high-efficiency degreasing method based on the efficient hydrolysis of lipase to animal skin oil in view of the deficiencies of the existing enzyme degreasing technology, so as to solve the problem of large pollution and saponification of traditional surfactant or organic solvent degreasing methods. And the defect of low degreasing efficiency of single lipase or lipase combined with surfactant degreasing method, to realize the clean and efficient degreasing of animal skin without solvent and external surfactant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 - Lipase degreasing of sheep leather after softening process

[0028] Put 100kg of softened sheepskin prepared according to the conventional tanning process into the drum, add 60kg of water, adjust the temperature to 30-35°C, adjust the pH value of the bath liquid to 7.0-7.5, and then add an appropriate amount of neutral lipase (Shandong Longket Enzyme Preparation Co., Ltd., the optimum pH value is 7.0-7.5), the activity concentration of lipase in the bath liquid is 15-20U / mL, after turning for 1 hour, add sodium carbonate 1.2-1.5kg and sodium tripolyphosphate 0.3-0.6 kg, at intervals of 30 minutes each time, maintain the pH of the bath solution at 9.0-10.5, rotate at intervals, rotate for 5 minutes every 30 minutes, for a total of 1-2 hours, and drain. Then add 100kg of 30-35℃ water and 0.2kg of sodium carbonate, rotate for 15 minutes, drain, and repeat once.

[0029] Result shows, adopt method of the present invention, the degreasing rate of sheepskin is 82...

Embodiment 2

[0032] Example 2 - Two-step lipase degreasing of pigskin tanning and softening process

[0033](1) Enzyme degreasing in the water immersion process: wash 100kg of salt-wet pigskin with water, pre-soak in water and remove the meat, add to the drum, add 200kg of water, adjust the temperature to about 22°C, add 0.2kg of sodium carbonate, and rotate for 30 -60 minutes, after adjusting the pH value of the bath solution to 8.0-8.5, add 1.0kg Nowolase DG (a weak alkaline lipase preparation, Sichuan Dawei Technology Co., Ltd., the optimum pH value is 8.0-8.5), and the fat in the bath solution Enzyme activity concentration is 5-10U / mL, rotate for 60 minutes; then add penetrant JFC 0.2kg, fungicide 0.2kg, rotate for 60 minutes; add sodium carbonate 0.4g and sodium metasilicate 0.2kg, rotate for 30 minutes , rotate at intervals, rotate for 5 minutes per hour, the total soaking time is about 22 hours, and maintain the pH of the bath solution at 9.5-10.5 during the soaking process.

[003...

Embodiment 3

[0038] Example 3 - Lipase Degreasing During Collagen Extraction from Animal Skin

[0039] After removing the flesh from the fresh pigskin, weigh 100kg, shaved and minced, put it into a container, add 60kg of 0.05mol / L phosphate buffer solution with a pH value of 7.5, and add weak acid lipase (Yunnan Aikete Biotechnology Co., Ltd. Co., Ltd., the optimum pH value is 6.0-6.5), so that the enzyme concentration in the bath solution is 20U / mL, shake at 32°C for 2 hours, and then add appropriate amount of sodium carbonate and 1.5kg sodium pyrophosphate, so that the pH value of the bath solution is 10 Around, continue to shake for 2h. Discard the remaining bath liquid, and wash the pigskin scraps thoroughly with warm water at 32°C. Then add protease to treat the degreased pigskin debris, centrifuge to remove the residue, and the supernatant is salted out and centrifuged to obtain purified collagen.

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Abstract

The invention provides an efficient degreasing method based on the catalytic hydrolysis function of lipase on animal skin grease and application of the efficient degreasing method. The method is characterized in that the catalytic hydrolysis reaction of the lipase on the animal skin grease is carried out by stages, and in the enzyme action initial stage, grease in the animal skin is catalyzed to be hydrolyzed under the optimum pH value of the lipase; and in the reaction, alkali and a fatty acid dispersing agent are added later, soluble soap is formed by fatty acid in situ to enter a water phase, product fatty acid and grease molecules are separated in time, the product inhibition and surfactant inhibition functions of the lipase catalytic reaction are eliminated, the lipase generates superactivity, the enzymatic catalysis efficiency is improved, no surfactant needs to be added, and solvent and surfactant free efficient degreasing of the animal skin is achieved. The method is suitable for carrying out efficient degreasing on the animal skin in the processes such as tanning, fur coat making, glue making and polypeptide and active substance extracting with any animal skins as raw materials.

Description

technical field [0001] The invention relates to an animal hide processing technology, in particular to a method for efficiently degreasing animal hide in the processes of tanning, fur making, rubber making, polypeptide and active substance extraction using animal hide as a raw material. Background technique [0002] As a by-product of the meat industry, animal skins are widely used in tanning, fur making, rubber making, and raw materials for extracting peptides and various active substances. The oil in animal skins has a significant impact on the production process and quality of these products. negative impact. For example, for leather or fur processing, degreasing and uncleanness will hinder the penetration of post-process chemical materials and their reaction with collagen active groups, affect the brightness and uniformity of dyeing, and may cause peculiar smell, Defects such as oil frost and poor coating adhesion. Fatty acids produced by hydrolysis of fats, calcium io...

Claims

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Application Information

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IPC IPC(8): C14C5/00
CPCC14C5/00
Inventor 彭必雨罗凤香田永鑫张春晓贾欣驹张旭高蒙初
Owner SICHUAN UNIV
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