Blue wet cow leather dechroming/softening processing method

A technology of softening and cowhide, which is applied in the field of dechrome softening of wet blue cowhide, can solve the problems of soft and comfortable leather products, hard leather blanks, etc., and achieve obvious economic and social benefits, full leather body, Strong three-dimensional effect of skin texture

Inactive Publication Date: 2014-05-14
HUNAN LEAD LEATHER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. Due to the insufficient pre-tanning treatment of wet blue cowhide, the leather blank is hard, and the performance of the finished leather product cannot meet the requirements of softness and comfort.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) weighing

[0019] Weigh the wet blue cowhide as the basis for the amount of materials used in the following processes (the raw materials used in each process are measured by weight percentage of leather). Put the wet blue cowhide into the drum.

[0020] (2) Back to wet rinse

[0021] Add 150% water at 45°C to the drum, then add 2% oxalic acid, 1% acid protease, and 1% degreasing agent. The speed is 8r / min, and the rotation is 60min. Rinse with room temperature water and drain.

[0022] (3) Alkali

[0023] Add 150% normal temperature water, 2% sodium formate, 1% degreasing agent, rotate for 20min at 6r / min, add 3% soda ash, and rotate for 40min.

[0024] (4) Detanning

[0025] Add 4% sodium hydroxide solution, rotate at 6r / min for 90min; (Note: The sodium hydroxide solution is dissolved by adding 35 parts of 98% sodium hydroxide and 100 parts of water, and use it after cooling, the same below).

[0026] Add 4% sodium hydroxide solution, 1.5% alkaline softening...

Embodiment 2

[0032] (1) weighing

[0033] Weigh the wet blue cowhide as the basis for the amount of materials used in the following processes (the raw materials used in each process are measured by weight percentage of leather). Put the wet blue cowhide into the drum.

[0034] (2) Back to wet rinse

[0035] Add 100% water at 30°C to the drum, then add 1% oxalic acid, 2% acid protease, and 1.5% degreasing agent. The speed is 10r / min, and the rotation is 80min. Rinse with room temperature water and drain.

[0036] (3) Alkali

[0037] Add 100% normal temperature water, 1% sodium formate, 1.5% degreasing agent, rotate for 40min at a speed of 10r / min, add 2% soda ash, and rotate for 60min.

[0038] (4) Detanning

[0039] Add 2% sodium hydroxide solution, rotate at 8r / min for 180min; (Note: The sodium hydroxide solution is dissolved by adding 35 parts of 98% sodium hydroxide and 100 parts of water, and use it after cooling, the same below).

[0040] Add 6% sodium hydroxide solution, 1% al...

Embodiment 3

[0046] (1) weighing

[0047] Weigh the wet blue cowhide as the basis for the amount of materials used in the following processes (the raw materials used in each process are measured by weight percentage of leather). Put the wet blue cowhide into the drum.

[0048] (2) Back to wet rinse

[0049] Add 200% water at 50°C to the drum, then add 3% oxalic acid, 3% acid protease, and 2% degreasing agent. The speed is 6r / min, and the rotation is 120min. Rinse with room temperature water and drain.

[0050] (3) Alkali

[0051] Add 200% normal temperature water, 3% sodium formate, 2% degreasing agent, rotate for 60min at 8r / min, add 4% soda ash, and rotate for 50min.

[0052] (4) Detanning

[0053] Add 6% sodium hydroxide solution, rotate at a speed of 10r / min for 60min; (Note: The sodium hydroxide solution is dissolved by adding 100 parts of water to 35 parts of 98% sodium hydroxide, and used after cooling, the same below).

[0054] Add 4% sodium hydroxide solution, 1.5% alkaline...

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PUM

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Abstract

The invention provides a blue wet cow leather dechroming softening processing method which comprises steps of rewetting, washing, basifying, detanning, dealkalizing, softening and the like. According to the blue wet cow leather dechroming softening processing method provided by the invention, a comprehensive technique that acid, alkali and enzyme are combined is adopted for dechroming and softening, so that damage to human bodies caused by Cr<6+> is avoided; when and after the blue wet cow leather is subjected to dechroming, the leather fibers are loosened under the action of alkali and softening emzyme, and the purpose of softening the leather is achieved. After the blue wet cow leather is subjected to dechroming and softening, normal later processing procedures can be performed according to requirements of products. The leather processed by using the method is particularly applicable to manufacturing of environment-friendly chromium-free instep leather, sofa leather, natural leather and the like.

Description

technical field [0001] The invention relates to the post-treatment technology of cowhide, in particular to a method for dechroming and softening wet blue cowhide. Background technique [0002] At present, China has become a world-recognized leather production and processing power. However, my country's cowhide resources are limited, and leather companies need to import a large amount of cowhide from Africa and other places every year. Due to factors such as transportation costs and sanitation and epidemic prevention, the imported cowhide is not raw leather, but wet blue cowhide after preliminary processing. Wet blue cowhide has the following disadvantages: [0003] 1. Wet blue cowhide contains chromium. Wet blue cowhide is a semi-finished leather product made by chrome tanning, in which trivalent chromium will be converted into hexavalent chromium due to adverse factors such as processing or storage, and Cr 6+ Is a serious carcinogen. In order to protect the life, healt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/08
Inventor 雷明智刘忠卿周博铨
Owner HUNAN LEAD LEATHER
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