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Method for carrying out unhairing and liming treatment without dust and akali sulphide during buffalo hide tanning

Active Publication Date: 2012-08-08
国家皮革质量监督检验中心(浙江) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lime and calcium salts increase the amount of mud and the transportation cost of mud, and at the same time, a large amount of lime also makes it difficult to recover protein from liming and gray skin washing baths

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: production process of buffalo leather upper leather

[0031] (1) Presoaked water

[0032] Take 100 kg of rawhide and put it into the drum, add 200 kg of water at 25°C to the drum, 0.1 kg of soaking agent BH-C, 0.4 kg of soda ash, 0.10 kg of MERPIN 8000 fungicide, 0.1 kg of Baim AN-C degreasing agent, turn 30 minutes, stop for 30 minutes, a total of 4 times, and then go out to remove the meat.

[0033] (2) Soaking in water

[0034] Add 200kg of water at 25°C, 0.2kg of soaking agent BH-C, 0.4kg of soda ash, 0.10kg of MERPIN 8000 fungicide, and 0.2kg of Baim AN-C degreasing agent into the above drum, turn for 15 minutes, stop for 15 minutes, A total of 4 times, add 0.4 kg of soda ash, rotate for 15 minutes, stop for 15 minutes, a total of 4 times, then rotate for 5 minutes every 2 hours, control the pH value to 9.2, for a total of 20 hours, check that the soaked skin and bones are soft, and the incisions are all transparent , control water.

[0035] (3) P...

Embodiment 2

[0047] Embodiment 2: buffalo leather garment leather technology

[0048] (1) Presoaked water

[0049] Take 100 kg of raw hide and put it into the drum, add 250 kg of water at 28 °C, 0.15 kg of soaking agent BH-C, 0.45 kg of soda ash, 0.13 kg of MERPIN 8000 fungicide, 0.15 kg of Baimu AN-C degreasing agent, and turn to the drum. 30 minutes, stop for 30 minutes, a total of 4 times, and then go out to remove the meat.

[0050] (2) Soaking in water

[0051] Add 250 kg of water at 28°C, 0.25 kg of soaking agent BH-C, 0.45 kg of soda ash, 0.13 kg of MERPIN 8000 bactericide, and 0.3 kg of Baimu AN-C degreasing agent into the above drum, turn for 15 minutes, stop for 15 minutes, A total of 4 times, add 0.45 kg of soda ash, rotate for 15 minutes, stop for 15 minutes, a total of 4 times, then rotate for 5 minutes every 2 hours, control the pH value to 9.3, for a total of 22 hours, check that the skin and bones are soft and the incisions are all transparent , control water.

[0052] ...

Embodiment 3

[0064] Embodiment 3: buffalo leather sofa leather technology

[0065] (1) Presoaked water

[0066] Take 100 kg of rawhide and put it into the drum, add 300 kg of water at 30 °C to the drum, 0.2 kg of soaking agent BH-C, 0.5 kg of soda ash, 0.15 kg of MERPIN 8000 fungicide, 0.2 kg of Baim AN-C degreasing agent, turn 30 minutes, stop for 30 minutes, a total of 4 times, and then go out to remove the meat.

[0067] (2) Soaking in water

[0068] Add 300kg of water at 30°C, 0.3kg of soaking agent BH-C, 0.5kg of soda ash, 0.15kg of MERPIN 8000 bactericide, and 0.4kg of Baimu AN-C degreasing agent into the above drum, 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 value to 9.5, for a total of 24 hours, check that the soaked skin and bones are soft, and the incisions are all transparent , control water.

[0069] (3) Pretreatment ...

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PUM

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Abstract

The invention discloses a method for carrying out unhairing and liming treatment without dust and akali sulphide during buffalo hide tanning. The method sequentially comprises steps of pre-soaking, soaking, pretreatment, unhairing, expanding, dealkalizing, softening and pickling. Sodium sulfide, sodium hydrosulfide and lime are not used in the invention so that pollution during the tanning process is greatly reduced, sewage discharged by the process is treated more easily, and a great amount of lime sediment and residual which is produced in a conventional process does not appear. Limed pelt water wash which is a procedure consuming the greatest amount of water is eliminated; as only a small amount of calcium scale is generated during the softening, water wash time and amount of water forwashing are reduced during the softening; hereby, the amount of the saved water is approximately 20-40 percent of the total amount of the discharged sewage. Before the use of a biological enzyme for treatment, peltry undergoes pretreatment by means of using a chemical material, therefore, hair roots are loosened, grain surface of the peltry is protected from being damaged, and leather suffers little loss. Compared with the conventional process, the process of the invention reduces the production period by 20 h, saves water, electricity and the chemical material, and reduces the consumption ofsewage disposal materials and the number of mechanical apparatuses.

Description

【Technical field】 [0001] The invention relates to the field of tanning, in particular to a lime-free and alkali-sulfurized depilation and liming treatment method for buffalo hide leather, in particular to depilation and liming treatment of buffalo leather garment leather, sofa leather, shoe upper leather and the like before tanning. 【technical background】 [0002] Since the reform and opening up, my country's leather industry has played a role that cannot be underestimated in earning foreign exchange through export, enriching the urban commodity market, 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 shutting down or regionally transferring the leather industry. [0003] At present, more than 98% of tanneries use soda sulfide lime traditional leather depilation liming process, which has the advanta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/06
Inventor 黄新霞马贺伟单志华李书卿徐寿春浦国忠丁友新
Owner 国家皮革质量监督检验中心(浙江)
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