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Hair-saving and hair removing tanning method by adopting micro enzyme-alkaline process

A technology for hair preservation and depilation and enzyme alkali, which is applied in the field of tanning by the micro-enzyme alkali method for hair preservation and depilation. effect of substance content

Active Publication Date: 2013-09-25
苏州盛泽科技创业园发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organosulfide instead of Na 2 S hair removal can eliminate S 2- pollution, but it has not been put into industrial use because of its high price. Generally, it is only used as a hair removal aid, and it cannot solve the problem of high sulfide content or high CODcr in waste liquid.
[0007] The main feature of Blair (blair) hair removal method is that the hair shaft is treated with appropriate alkali (lime) to produce hair protection, and then sodium hydrogen sulfide is added, the hair root is damaged because it is not protected, and the hair root is loosened, and then the hair is removed by mechanical action. After the hair removal, the hair is filtered and separated, and the waste liquid is recycled. The disadvantage of this method is that the hair removal time is longer, and the sulfide is added in the later stage of the ash, and the control of the time and temperature of the process is relatively strict. Inadvertently prone to excessive hair protection

Method used

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  • Hair-saving and hair removing tanning method by adopting micro enzyme-alkaline process

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Experimental program
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Effect test

Embodiment 1

[0023] Put the cowhide that has been conventionally soaked and de-fleshed into the drum, and add water with a tare weight of 300wt%, adjust the water temperature to 24°C, and then add 0.8wt% of tare-containing enzyme additives and 0.1wt% of soda ash. The above-mentioned enzyme-containing auxiliary agent is an enzyme-containing non-organic amine substance. Adjust the pH value of the bath to about 9.5, turn it on and off, and continue for 60 minutes. Then add lime with a tare weight of 1.0 wt% to the bath to maintain the bath. Liquid temperature is 24 ℃, after rotating again 60min, then, add depilatory agent in bath liquid again, described depilatory agent is the mixture of sodium sulfide and sodium hydrosulfide, and the consumption of sodium sulfide is 1.2wt% of tare weight, The consumption of sodium hydrosulfide is 0.8wt% of tare weight, continue to maintain the temperature of the bath liquid at 24°C, combine rotation and stop, stop for 30 minutes every 30 minutes, and maintain...

Embodiment 2

[0025] Put the cowhide that has been conventionally soaked and de-fleshed into the drum, and add water with a tare weight of 250wt%, adjust the water temperature to 20°C, and then add 1.2wt% of tare-containing enzyme additives and 0.2wt% of soda ash. The above-mentioned enzyme-containing auxiliary agent is an enzyme-containing non-organic amine substance, adjust the pH value of the bath to be about 10, turn on and off, and continue for 90 minutes, then add lime with a tare weight of 2.0wt% in the bath to maintain the bath. Liquid temperature is 20 ℃, after rotating again 80min, then, add depilatory agent in bath liquid again, described depilatory agent is the mixture of sodium sulfide and sodium hydrosulfide, and the consumption of sodium sulfide is 1.1wt% of tare weight, The consumption of sodium hydrosulfide is 0.8wt% of tare weight, continue to maintain the temperature of the bath liquid at 20°C, combine rotation and stop, stop for 30 minutes every 30 minutes, and maintain 1...

Embodiment 3

[0027]Put the cowhide that has been conventionally soaked and de-fleshed into the drum, add water with a tare weight of 280wt%, adjust the water temperature to 25°C, and then add 0.7wt% of tare-containing enzyme additives and 0.2wt% of soda ash. The above-mentioned enzyme-containing auxiliary agent is an enzyme-containing non-organic amine substance, and the enzyme-containing non-organic amine substance is Smur blue 4008-C, and the pH value of the bath is adjusted to be about 9.0. , then add lime with a tare weight of 1.5wt% in the bath, maintain the temperature of the bath at 25°C, and rotate for 50 minutes, then add a depilatory to the bath, the depilatory being sodium sulfide and hydrosulfurized A mixture of sodium, and the amount of sodium sulfide is 1.0wt% of the tare weight, the amount of sodium hydrosulfide is 0.8wt% of the tare weight, continue to maintain the temperature of the bath liquid at 25 ° C, combine rotation and stop, every turn 30min stop 30min, maintain 120...

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Abstract

The invention relates to a hair-saving and hair removing tanning method by adopting a micro enzyme-alkaline process, belongs to the technical field of leather treatment, in order to solve the problems of difficulty in operation and extremely high index of contaminants in wastewater of the prior art. The hair-saving and hair removing tanning method comprises the following steps of: transferring cow leather with flesh removed through soaking in water in a drum, adding in water and an enzyme-containing adjuvant 4008-C, adjusting the pH value to be 9.0-10.0, combing rotating and stopping, adding in tare lime, maintaining the temperature to be 20 DEG C-25 DEG C, rotating for 50-80 minutes, adding a hair removal agent, maintaining the temperature to be 20-25 DEG C, rotating for 30 minutes, then stopping for 30 minutes, maintaining for 120-150 minutes, finally adding in lime and a liming auxiliary, combining rotating and stopping, continuing for 10 hours, taking out of the drum, and splitting. The method has the advantages of simple technology, low cost, and low contents of ammonia nitrogen, sulfide, COD cr and solid waste.

Description

technical field [0001] The invention relates to a tanning method for hair preservation and depilation by microenzyme alkaline method, which belongs to the technical field of leather treatment. Background technique [0002] Depilation is a very important preparatory process in the tanning process. The purpose of depilation is to remove hair and epidermis, expose the natural grain of the hide, and endow the finished leather with a smooth and beautiful surface. Although the traditional ash-alkali depilation method has the advantages of easy-to-obtain raw materials, low cost, simple operation, and stable leather quality, it is also one of the important sources of tanning pollution. , S 2- (divalent sulfur), TN (total nitrogen) and part of the sludge (hydrolyzed fragments of wool) are the main sources. [0003] Judging from the current level of tanning technology, conventional acid, alkali, and salt treatments have almost no potential to improve the quality and performance of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/06C14C1/04
Inventor 阮道光
Owner 苏州盛泽科技创业园发展有限公司
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