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Natural leather degreasing technology based on enzymolysis method

A technology of natural leather and degreasing process, applied in the field of leather processing, can solve the problems of complex sewage composition, large amount of foam, sewage treatment, etc., and achieve the effects of simple wastewater composition, less environmental pollution, and improved degreasing rate.

Inactive Publication Date: 2018-09-28
金继善
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, a single surfactant cannot meet such use requirements, and compound surfactants have the problems of large foam generation and complicated sewage components, which is not conducive to subsequent leather cleaning and sewage treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) One-time high-pressure softening: first add natural leather into the autoclave, start the vacuum pump to evacuate to make the pressure reach -0.08 to -0.1MPa, and then pass in humid air with a temperature of 50-55°C and a relative humidity of 65-75%. After the pressure reaches 3.5MPa, keep the pressure for 20 minutes, and finally return to normal pressure;

[0023] (2) Enzymatic degreasing: soak the pretreated leather in the enzymolysis solution, which is prepared by adding water to alkaline lipase. After the hydrolysis, the leather is rolled to remove excess enzymatic hydrolysis solution, and rinsed with clean water;

[0024] (3) Secondary high-pressure softening: put the leather degreased by enzymatic method into the autoclave again, start the vacuum pump to evacuate to make the pressure reach -0.08 to -0.1MPa, and then pass in dry air at a temperature of 50-55°C, wait for the pressure After reaching 5MPa, keep the pressure for 10 minutes, and finally return to n...

Embodiment 2

[0029] (1) One-time high-pressure softening: first add natural leather into the autoclave, start the vacuum pump to evacuate to make the pressure reach -0.08 to -0.1MPa, and then pass in humid air with a temperature of 50-55°C and a relative humidity of 65-75%. After the pressure reaches 3.5MPa, keep the pressure for 20 minutes, and finally return to normal pressure;

[0030] (2) Enzymatic degreasing: soak the pretreated leather in the enzymolysis solution, which is prepared by adding water to alkaline lipase. After the hydrolysis, the leather is rolled to remove excess enzymatic solution, and rinsed with water in which poloxamer-polyglutamate is dissolved, and 1.5kg of poloxamer-polyglutamate is dissolved in every 50kg of water Esterates;

[0031] (3) Secondary high-pressure softening: put the leather degreased by enzymatic method into the autoclave again, start the vacuum pump to evacuate to make the pressure reach -0.08 to -0.1MPa, and then pass in dry air at a temperature...

Embodiment 3

[0056] Set up comparative example 1 without step (4) cleaning, comparative example 2 without step (1) high-pressure softening, and comparative example 3 without step (3) high-pressure softening.

[0057] Using Examples 1-2 and Comparative Examples 1-4 to degrease the same batch of natural cowhide with the same amount of water used in the corresponding steps, the degreasing rate was measured, as shown in Table 1.

[0058] The degreasing effect of table 1 degreasing process of the present invention

[0059] group

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Abstract

The invention discloses a natural leather degreasing technology based on an enzymolysis method and relates to the technical field of leather machining. The natural leather degreasing technology basedon an enzymolysis method comprises the following operations of (1) primary high-pressure softening, (2) enzymolysis degreasing, (3) conducting secondary high-pressure softening and (4) cleaning. By the adoption of the natural leather degreasing technology based on the enzymolysis method, natural leather is rapidly softened through two-time high-pressure softening treatment, so that the adhesive force on the natural leather of grease is reduced, and then follow-up degreasing treatment is facilitated; in addition, grease on the natural leather is effectively removed through the enzymolysis function of an alkaline lipase, and the grease is hydrolyzed into glycerol and fatty acid; meanwhile, by the adoption of the enzymolysis degreasing method, grease in the leather and free grease in adiposecells can be efficiently removed; and added sodium bicarbonate in clear water is used for removing a trace of residual grease on the leather in the final cleaning process, and the degreasing rate is further improved.

Description

Technical field: [0001] The invention relates to the technical field of leather processing, in particular to a natural leather degreasing process based on an enzymatic hydrolysis method. Background technique: [0002] In the process of leather processing, since there is a certain amount of fat in natural leather, if it is not degreased, it will hinder the penetration of tanning process materials into the leather, and the fatty acids generated by the hydrolysis of oil will react with metal ions to form water-insoluble Metallic soap salts, not conducive to dyeing treatments. Therefore, the degreasing process is a crucial process in the processing of natural leather. [0003] Emulsification degreasing is the most widely used degreasing method in the leather industry, also known as surfactant degreasing, and the use of surfactant degreasing agents can remove more than 90% of the oil from raw hides. However, leather degreasing not only removes the grease on the surface of the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C5/00
CPCC14C5/00
Inventor 金继善
Owner 金继善
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