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Ashless and alkali sulfide free depilation liming treatment method for preparing leather from raw sheep skin

A treatment method and technology of sheep skin, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, chemical treatment before tanning, etc., to overcome uneven expansion and save The effect of basic material consumption and stable product quality

Inactive Publication Date: 2008-09-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large amounts of lime also increase the difficulty of protein recovery in liming and pelt baths

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Dehairing and liming treatment method of sheepskin garment leather

[0034] (1) Soaking

[0035] Take 100 kg of rawhide, put it into the drum, add 400 kg of water at 30℃ in the drum, add 0.6 kg, 0.5 kg of soda ash, 0.1 kg of MERPIN 8000 fungicide, 0.4 kg of Beim AN-C degreasing agent, turn for 15 minutes , Stop for 15 minutes, a total of 4 times, add 0.5 kg of soda ash, turn for 15 minutes, stop for 15 minutes, a total of 4 times, then turn for 5 minutes every 2 hours, control the pH to 9.5, a total of 24 hours, check the softness of the skin and bones , The incision is all thorough, the drum is out, and the meat is removed.

[0036] (2) Pretreatment

[0037] Add 100 kilograms of water with a temperature of 28°C and 0.8 kilograms of pretreatment agent with a mass ratio of urea: sodium hydroxide of 1.0:1.5:1.5 into the drum, rotate for 20 minutes, stop for 20 minutes, 4 times in total. After that, it will turn for 3 minutes every 2 hours for a total of 18 hours to...

Embodiment 2

[0047] Example 2: Dehairing and liming treatment method of sheepskin glove leather

[0048] (1) Soaking

[0049] Take 100 kg of rawhide, put it into the drum, add 300 kg of water at 28℃ in the drum, add 0.4 kg, 0.4 kg of soda ash, 0.12 kg of MERPIN 8000 fungicide, 0.5 kg of Beim AN-C degreasing agent, turn for 15 minutes , Stop for 15 minutes, a total of 4 times, add 0.4 kg of soda ash, turn for 15 minutes, stop for 15 minutes, a total of 4 times, then turn for 5 minutes every 2 hours, control the pH to 9.2, a total of 20 hours, check the softness of the skin and bones , The incision is all thorough, the drum is out, and the meat is removed.

[0050] (2) Pretreatment

[0051]Add 120 kg of water with a temperature of 30°C to the above drum, add 0.6 kg of pretreatment agent with a mass ratio of urea: sodium hydroxide of 2.0:1.0:1.0, rotate for 20 minutes, stop for 20 minutes, 4 times in total. Then turn for 3 minutes every 2 hours for a total of 16 hours to control the water.

[005...

Embodiment 3

[0061] Example 3: Dehairing and liming treatment method of sheepskin shoe upper leather

[0062] (1) Soaking

[0063] Take 100 kg of rawhide, put it into the drum, add 350 kg of water at 25℃ in the drum, add 0.5 kg, 0.45 kg of soda ash, 0.15 kg of MERPIN 8000 fungicide, 0.6 kg of Beim AN-C degreasing agent, turn for 15 minutes , Stop for 15 minutes, a total of 4 times, add 0.45 kg of soda ash, turn for 15 minutes, stop for 15 minutes, a total of 4 times, then turn for 5 minutes every 2 hours, control the pH to 9.3, a total of 23 hours, check the softness of the skin and bones , All incisions are thorough and water controlled.

[0064] (2) Pretreatment

[0065] Add 150 kg of water with a temperature of 25°C and 0.5 kg of pretreatment agent with a mass ratio of urea: sodium hydroxide of 1.5:1.0:1.5 into the drum, rotate for 20 minutes, stop for 20 minutes, a total of 4 times. Then turn for 3 minutes every 2 hours for a total of 12 hours to control the water.

[0066] Add 70 kilogram...

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PUM

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Abstract

The invention relates to an alkali depilation liming method of currying and processing goatskin without generating dust and vulcanization. The method is characterized in that sodium sulfide, sodium bisulfide and lime are not used; lime precipitate and residua do not appear to ensure the drained waste water to be more easily processed; the pollution to the environment in the currying process is greatly reduced. The dust skin washing which is a highest water cost working procedure is eliminated, and the saved water is about 20 percent to 40 percent of the total draining quantity of waster water. The damage to finished leather quality is reduced because of mechanical effect; the loose surface rate caused by mechanical effect is greatly reduced; the production period is also shortened; various materials are saved and the production combined cost is reduced.

Description

Technical field [0001] The invention relates to a ash-free and alkali-sulfide-free dehairing and liming treatment method for sheep skin tanning, and belongs to the field of tanning preparation sections. The method is suitable for dehairing and liming treatment before tanning of sheepskin garment leather, glove leather and shoe upper leather that are currently required on the market. technical background [0002] For more than 20 years, my country's leather industry has played an important role in earning foreign exchange through exports, enriching urban commodity markets, and developing the economy in rural and pastoral areas. However, the development of the leather industry has been restricted due to pollution problems. At present, the pressure of environmental protection has become a trend of closure or regional transfer of the leather industry. [0003] At present, more than 98% of tanneries use the traditional tanning dehairing and liming process with soda sulfide lime. Its a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/06
Inventor 李书卿单志华王亚娟卓学张松林
Owner SICHUAN UNIV
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