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Totally enclosed less-chrome tanning circulation technique based on zirconium-aluminum-titanium cooperation tanning agent

A fully enclosed technology with tanning agents, applied in chemical treatment before tanning, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., to achieve good matching, The effect of reducing loose surface rate and good industrial production base

Inactive Publication Date: 2013-03-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the waste chromium solution is recycled at home and abroad, there are still various disadvantages: (1) The chromium content in the waste solution is relatively large or the difference is relatively large, and it needs to be tested every time, and the supplementary amount has been determined, and the operation is complicated; (2) With the increase of the number of cycles, the quality of the leather is difficult to guarantee; (3) The amount of chromium salt is reduced compared with the traditional chrome tanning method, but the amount is still large

Method used

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  • Totally enclosed less-chrome tanning circulation technique based on zirconium-aluminum-titanium cooperation tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Pickling: Throw in the softened bare hide, add 50-60 parts of water into the drum, the inner temperature of the drum is normal temperature, add 7 parts of salt and 1 part of alum from the drum door, and continue to rotate for 10 minutes; measure the water in the bath. Salt concentration, the salt concentration is required to be ≥8°Bé; slowly add 0.5 parts of formic acid (1:10 diluted with water) and 0.8~0.9 parts of sulfuric acid (1:10 diluted with water) from the drum shaft during rotation, continuously rotate for 20 minutes, stop 10min, repeat 3~4 times, stop the drum overnight; rotate for 30min the next day; end point pH=2.8~3.0;

[0027] (2) Drain water with horses: Drain water with horses for more than 12 hours;

[0028] (3) Weighing: Accurate weighing is used as the basis for the calculation of the following processes;

[0029] (4) Pretreatment: Put acid bare hides in the drum, increase the weight of the hides to 120%, and the weight of the bare hides after t...

Embodiment 2

[0033] (1) Pickling: Throw in the softened bare hide, add 50-60 parts of water into the drum, the inner temperature of the drum is normal temperature, add 7 parts of salt and 1 part of alum from the drum door, and continue to rotate for 10 minutes; measure the water in the bath. Salt concentration, the salt concentration is required to be ≥8°Bé; slowly add 0.5 parts of formic acid (1:10 diluted with water) and 0.8~0.9 parts of sulfuric acid (1:10 diluted with water) from the drum shaft during rotation, continuously rotate for 20 minutes, stop 10min, repeat 3~4 times, stop the drum overnight; rotate for 30min the next day; end point pH=2.8~3.0;

[0034] (2) Drain water with horses: Drain water with horses for more than 12 hours;

[0035] (3) Weighing: Accurate weighing is used as the basis for the calculation of the following processes;

[0036] (4) Pretreatment: Put the acid bare hide in the drum, the weight of the hide increases to 120%, and the weight of the bare hide after...

Embodiment 3

[0040] (1) Pickling: Throw in the softened bare hide, add 50-60 parts of water into the drum, the inner temperature of the drum is normal temperature, add 7 parts of salt and 1 part of alum from the drum door, and continue to rotate for 10 minutes; measure the water in the bath. Salt concentration, the salt concentration is required to be ≥8°Bé; slowly add 0.5 parts of formic acid (1:10 diluted with water) and 0.8~0.9 parts of sulfuric acid (1:10 diluted with water) from the drum shaft during rotation, continuously rotate for 20 minutes, stop 10min, repeat 3~4 times, stop the drum overnight; rotate for 30min the next day; end point pH=2.8~3.0;

[0041] (2) Drain water with horses: Drain water with horses for more than 12 hours;

[0042] (3) Weighing: Accurate weighing is used as the basis for the calculation of the following processes;

[0043] (4) Pretreatment: put the acid bare hide in the drum, the weight of the hide increases to 120%, and the weight of the bare hide after...

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Abstract

The invention discloses a totally enclosed less-chrome tanning circulation technique based on a zirconium-aluminum-titanium cooperation tanning agent, characterized in that the tanning system is formed into a totally enclosed circulation system so as to realize recycling of waste tanning liquid and thoroughly eliminate pollution caused by heavy metal chrome while greatly reducing the dosage of the chrome tanning agent. The technique has the advantages that no new material is added, the tanning liquid has stable components, no secondary pollution is caused, the investment is low and the operation is simple; the dosage of the zirconium-aluminum-titanium cooperation tanning agent and the dosage of the chrome agent are low, and the total dosage of two tanning agents is lower than 9%; the material cost is low and the utilization rate of the chrome salt is higher than 99%; the industrially produced crust leather has the shrinkage temperature of higher than 90 DEG C, and thus can be stored for a long time without deannage, and is excellent in water washing resistance; the grain side of the crust leather is fine, full and elastic and not easy to become loose; the leather body is light in color and excellent in dyeing property, and can be fabricated into different types of leather; and the solid waste is less in chrome content, thereby being convenient for recycling.

Description

[0001] Technical field: The invention belongs to the field of leather tanning, and is a fully closed circulation technology for tanning leather with less chromium based on zirconium-aluminum-titanium complex tanning agent. Background technique: [0002] Chromium salt has excellent tanning performance and is the first choice material for the production of light leather. It has a history of one and a half centuries. However, it cannot be ignored that the chromium pollution in the leather industry has become an insurmountable obstacle to the sustainable development of the world leather industry, and it is also a worldwide problem faced by the leather industry. In order to completely eliminate chromium pollution, Weihua has long been committed to the research of chromium-free multi-metal complex tanning agents and their tanning methods, prepared zirconium-aluminum-titanium multi-metal complex tanning agents, and optimized the chrome-free tanning of yellow cattle shoe upper leather...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/02C14C3/04C14C1/08C14C1/00
Inventor 但卫华何青但年华王康建
Owner SICHUAN UNIV
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