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Environment-friendly type crust leather production method

A production method and an environmentally friendly technology, applied in the field of leather manufacturing, can solve the problems of a large amount of chrome-containing leather waste, cannot be effectively treated, and pollute the environment, and achieve improved shrinkage temperature and comprehensive performance, reduced chromium-containing wastewater content, and protection environmental effects

Active Publication Date: 2013-04-24
四川亭江新材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the waste water contains a lot of chromium ions in the crust leather production method based on the conventional chrome tanning method, which cannot be effectively treated, and also produces a lot of chrome-containing leather waste, which seriously pollutes the environment. A kind of production method of environment-friendly type crust leather

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) No pickling tanning

[0032] Put the limed yellow cowhide in the drum for deliming, softening, washing and water control. Then add 50% normal temperature water of gray leather quality in the rotating drum, then add gray leather quality 3% non-pickling chrome-free tanning agent TWS, 3% non-pickling chrome-free tanning agent TWT, and rotate for 4 hours. Then add baking soda with 1.0% gray leather mass in the drum, adjust the pH value to 7.8-8.0, and then rotate for 1 hour. Finally, add hot water with 150% gray skin mass into the drum, keep the temperature in the drum at 38-40°C, rotate for 3 hours, stop the drum overnight, and rise the drum the next day to obtain wet white skin with a shrinkage temperature of 87°C.

[0033] (2) Retanning filling

[0034] Squeeze, smooth, and rewet the wet white hide of yellow cattle that has not been pickled and tanned to obtain a smooth peel. Put the shaved hides into the drum, add hot water with 50% weight of the shaved hides, ke...

Embodiment 2

[0041] (1) No pickling tanning

[0042] Put the limed yellow cowhide in the drum for deliming, softening, washing and water control. Then add normal temperature water with 100% gray hide quality in the rotating drum, then add 5% gray hide quality without pickling and chrome-free tanning agent TWS, and rotate for 6 hours. Then add baking soda with 1.2% gray leather mass in the drum, adjust the pH value to 8.0-8.2, and then rotate for 1.5 hours. Finally, add hot water with 250% gray skin mass into the drum, keep the temperature in the drum at 38-40°C, rotate for 4 hours, stop the drum overnight, and rise the drum the next day to obtain wet white skin with a shrinkage temperature of 85°C.

[0043] (2) Retanning filling

[0044] Squeeze, smooth, and rewet the wet white hide of yellow cattle that has not been pickled and tanned to obtain a smooth peel. Put the shaved hide into the drum, add hot water with 100% shaved hide weight, keep the temperature inside the drum at 45°C, add...

Embodiment 3

[0052] (1) No pickling tanning

[0053] Put the limed sheepskin in the drum for deliming, softening, washing and water control. Then add 80% normal temperature water of gray leather quality in the rotating drum, then add 9% gray leather quality without pickling and chrome-free tanning agent TWT, and rotate for 2 hours. Then add 0.2% baking soda of gray skin mass to the drum, adjust the pH value to 7.2-7.5, and then rotate for 0.5 hour. Finally, add hot water with 200% gray skin mass into the drum, keep the temperature in the drum at 38-40°C, rotate for 2 hours, stop the drum overnight, and rise the drum the next day to obtain wet white skin with a shrinkage temperature of 89°C.

[0054] (2) Retanning filling

[0055] Squeeze, smooth, and rewet the wet white sheep hide that has not been pickled and tanned to obtain a smooth peel. Put the shaved hide into the drum, add hot water with 50% weight of the shaved hide, keep the temperature inside the drum at 40°C, add acrylic reta...

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Abstract

The invention discloses an environment-friendly type crust leather production method, and aims at solving the problems that in a crust leather production method using conventional chrome tanning as basis, plenty of chromium ions are contained in waste water and cannot be effectively processed, plenty of leather wastes with chrome are also generated, and the environment is seriously polluted. The production method comprises the following steps of non-pickling tanning, retanning filling, dyeing fat liquoring and chrome retanning. The method adopts non-pickling non-chrome tanning technology, so solid wastes with the chrome cannot be generated. At the same time, through mutual matching with other procedures, finished leather shrinkage temperature and performance can be effectively improved so as to meet demands of leather production. At the last, the chrome retanning is adopted, only a path of waste water with the chrome is generated, waste water quantity is small, and the waste water is easy to recover and process. Therefore, compared with an existing crust leather production method using a chrome tanning method as basis, cleaning degree is high, the waste water quantity with the chrome can be effectively reduced, and the waste water is convenient to recover and process. At the same time, the leather wastes with the chrome cannot be produced, and the method is environment-friendly.

Description

technical field [0001] The invention relates to the field of leather manufacturing, in particular to an environment-friendly production method for crust leather. Background technique [0002] Chrome tanning has become the dominant tanning method in the leather industry because of its excellent leather-forming properties. However, this method will cause serious pollution to the environment, especially heavy metal pollution. At present, the production method of crust leather based on the chrome tanning method is to pre-treat the raw hides, pickle them, and then carry out chrome tanning. , then neutralized, washed, then dyed and fatliquored, and then retanned and filled. After the retanned and filled crust leather is subjected to standing, stretching, rewetting, shaking, softening, and finishing operations in sequence, the finished leather can be obtained. In the chrome tanning process, the binding rate of chromium is about 65%-70%, the chromium content in the waste liquid is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/08C14C3/28C14C9/00C14C9/02C14C9/04
Inventor 晏岚李滨李靖石碧张净周厚刚
Owner 四川亭江新材料股份有限公司
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