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Enzyme unhairing recycling technology during tanning

A process, neutral protease technology, applied in the field of enzymatic dehairing and recycling process in tanning, can solve the problems of particle surface damage, skin collagen loss, large particles, etc., to achieve less damage to leather collagen fibers, improve enzyme activity, good gloss effect

Inactive Publication Date: 2016-12-14
安徽银河皮革有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since alkaline and neutral proteases have strong catalytic hydrolysis effects on bare skin, it is easy to cause excessive loss of skin collagen. Strong, easy to cause uneven softening inside and outside, damage to the surface of the particles, making the surface dull and dull

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A process for recycling enzyme hair removal in tanning, comprising the following steps:

[0019] (1) Cleaning: clean the fresh raw hide to remove the dirt attached to the hide surface;

[0020] (2) Enzyme depilation: at a temperature of 40°C, add the compound enzyme for tanning into water, adjust the pH value to 6 with dilute sulfuric acid with a concentration of 35%, and perform depilation treatment for 6 hours;

[0021] The compound enzyme for tanning consists of 50,000 international units / gram of Bacillus subtilis AS1.398 neutral protease, 30,000 international units / gram of Actinomyces 166 neutral protease, 30,000 international units / gram of pepsin, 4 10,000 international units / gram of papain; the dosage of the compound enzyme for leather making is 200 international units / g skin based on the activity of papain;

[0022] (3) Hair removal: mechanically remove the loose hair on the skin and recycle it;

[0023] (4) Alkali soaking and dealkalization: immerse the leathe...

Embodiment 2

[0025] A process for recycling enzyme hair removal in tanning, comprising the following steps:

[0026] (1) Cleaning: clean the fresh raw hide to remove the dirt attached to the hide surface;

[0027] (2) Enzyme depilation: at a temperature of 45°C, add the compound enzyme for tanning into water, adjust the pH value to 6 with dilute sulfuric acid with a concentration of 40%, and perform depilation treatment for 8 hours;

[0028] The compound enzyme for tanning consists of 50,000 international units / gram of Bacillus subtilis AS1.398 neutral protease, 30,000 international units / gram of Actinomyces 166 neutral protease, 30,000 international units / gram of pepsin, 4 10,000 international units / gram of papain; the dosage of the compound enzyme for leather making is 300 international units / g leather based on the activity of papain;

[0029] (3) Hair removal: mechanically remove the loose hair on the skin and recycle it;

[0030] (4) Alkali soaking and dealkalization: immerse the lea...

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PUM

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Abstract

The invention discloses an enzyme unhairing recycling technology during tanning. The technology comprises following steps: fresh raw skin is cleaned, and dirt attached to the surface of the skin is removed; at the temperature ranging from 40 DEG C to 45 DEG C, complex phosphoesterasum for tanning is added into water, acid is used for adjusting the pH value to range from 4 to 6, and unhairing treatment is carried out for 6 h to 8 h; unhairing operation is carried out; loose hair on the skin is mechanically removed and recycled; leather is immersed into aqueous sodium hydroxide, CO2 gas is continuously led for dealkalization at the normal temperature, the end point pH value ranges from 7 to 8, tanning is carried out, and leather is obtained; complex phosphoesterasum for tanning is formed through compounding of bacillus subtilis AS1.398 neutral protease, actinomycetes 166 neutral protease, pepsase and papain, several synergistic effects generated through enzyme compounding are used for achieving the more ideal degreasing effect, and enzyme activity of lipase is effectively improved; the complex phosphoesterasum has small damage to leather collagenous fibers, a manufactured leather surface layer is uniform in particle, and the surface glossiness of the leather is good.

Description

technical field [0001] The invention belongs to the field of leather processing and manufacturing, in particular to an enzyme dehairing recycling process in leather making. Background technique [0002] A process in the preparatory section of the depilatory tanning production process, which refers to the process of removing the hair and epidermis from the dermis through some chemical, physical or biological treatments. In addition, the collagen fibers of the raw hide contain a lot of soluble protein and interfibrils After drying, they stick the fibers together, making the rawhide very hard and not resistant to bending, which greatly limits the use of rawhide. Lime-soda method (lime-sulfide system) is a commonly used method of dehairing in tanneries, this highly polluting operation accounts for more than 50% of the volume of organic waste in tanneries. Toxic S due to use of sulfide rot 2- Pollution, and a large amount of organic waste produced by the dissolution of hair and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/06
CPCC14C1/065
Inventor 姜培育
Owner 安徽银河皮革有限公司
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