Method for shortening leather making soaking time

A time, lipase technology, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, material analysis by observing the effect on chemical indicators, etc. Solve the problems of water infiltration, long immersion time, etc., and achieve the effects of good pH stability, good enzyme activity, and good temperature stability

Inactive Publication Date: 2016-06-01
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The simple method of soaking in water is to soak the raw skin directly with water, but ...

Method used

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  • Method for shortening leather making soaking time
  • Method for shortening leather making soaking time
  • Method for shortening leather making soaking time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Observing the effect of CGMCCNo.11218 enzyme powder on leather immersion

[0033] As shown in Table 1, take the corresponding quality of CGMCCNo.11218 enzyme powder and place it in a Küber dish, add deionized water to keep the liquid level at the scale of 0mL, and then put skin samples into different Küber dishes, Lift the spherical end of the Kuber dish to completely return the liquid to the cylindrical end, so that the skin sample is completely immersed in the liquid, and then use plastic wrap to seal the cylindrical end to prevent moisture from evaporating. Then at 15min, 30min, 60min, 120min and 24h, lift the cylindrical end to make the liquid flow into the spherical end completely, read the scale and calculate the water absorption rate after 1min, the result is as follows figure 1 shown. It can be seen that CGMCC No.11218 enzyme powder significantly improves the water absorption rate of hides during immersion.

[0034] Table 1: The dosage of CGMCCNo.11218 enzyme ...

Embodiment 2

[0037] The relationship between NaCl action and GMCC No.11218 enzyme powder's effect on leather immersion

[0038] The silver nitrate solution is calibrated with the sodium chloride standard solution prepared by burning to constant weight sodium chloride. According to the calculation, the concentration of the silver nitrate standard solution is 0.1012mol / L. Draw 1ml of Example 2 and react for 24h Put it in a 150ml Erlenmeyer flask, then add 40μL of potassium chromate indicator and 10mL of deionized water, and titrate it with silver nitrate standard solution until an obvious and stable orange-red color appears as the end point, each test Two sets of parallel experiments were carried out. The calculation of chloride ion content can be seen in formula ②. The calculated unit of chloride ion content is mg / L. The result can be seen figure 2 . It can be seen that sodium chloride has a relatively obvious effect on the enzyme action on the leather soaking process, and high con...

Embodiment 3

[0046] Observation of the Effect of Lipase on Water Soaking of Leather

[0047] As shown in Table 2, take lipase powder of corresponding quality and place it in a Kuber dish, add deionized water to keep the liquid level at 0mL, then put skin samples into different Kuber dishes, lift The spherical end of the Kuber dish allows the liquid to completely return to the cylindrical end, so that the skin sample is completely immersed in the liquid, and then the cylindrical end is sealed with plastic wrap to prevent moisture from evaporating. Then at 15min, 30min, 60min, 120min and 24h, lift the cylindrical end to make the liquid flow into the spherical end completely, read the scale and calculate the water absorption rate after 1min, the result is as follows image 3 shown. It can be seen that the lipase powder can obviously improve the water absorption rate of the hide during the soaking process, and the low concentration of lipase still has a very obvious improvement on the water a...

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Abstract

The invention relates to a method for shortening leather making soaking time. When Na+ and Ca2+ are used for leather soaking, protease and lipase are added to be used as an auxiliary, the concentration of Na+ and the concentration of Ca2+ in the soaking procedure are adjusted, and the protease is produced by bacillus amyloliquefaciens CGMCC No.11218 and bacillus alcalophilus high-producing strains CGMCC No.6537. The treatment time of a traditional soaking procedure is shortened, and the usage amount of sodium sulphide in the subsequent depilation process is lowered.

Description

technical field [0001] The invention belongs to the production field of tanning industry, and specifically relates to the application of enzyme powder produced by Bacillus amyloliquefaciens CGMCC No.11218 strain and lipase powder produced by Aspergillus oryzae TCCC41649 in the soaking process of leather making, so that the soaking time can be shortened and the The amount of sodium sulfide used in the subsequent depilation process. Background technique [0002] In the leather production process, the first step for purchased raw hide is to soak in water to fully soften it. Dirt, dirt, preservatives and soluble non-fibrous proteins can be removed during soaking. But the longer the hide is kept, the less soluble protein is removed when soaked in water. The simple method of soaking in water is to soak the raw skin directly with water, but it takes a long time for soaking in water, and for dry board skin, water is not easy to penetrate. In the traditional tanning industry, some...

Claims

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Application Information

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IPC IPC(8): C14C1/04G01N33/44G01N21/78
CPCC14C1/04G01N21/78G01N33/447
Inventor 路福平李玉曹珊程宝箴薛斌
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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