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Salt-free, pickling-free, short-process and little-chromium tanning method

An acid-free, short-process technology, applied in chemical treatment before tanning, small raw hide/large hide/leather/fur treatment, tanning treatment, etc., to reduce pollution, easy to store, and save resources.

Active Publication Date: 2015-07-22
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no complete leather produced by a complete low-chrome tanning method that meets or approaches the requirements of current chrome-tanned leather

Method used

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  • Salt-free, pickling-free, short-process and little-chromium tanning method
  • Salt-free, pickling-free, short-process and little-chromium tanning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Immersion, depilation, and liming are the same as traditional techniques.

[0045] (2) Ammonia-free deashing and softening

[0046] Take 100 kg of cauliflower skin, use 50 kg of water at 30°C, 0.2 kg of formic acid, 1.5 kg of lactic acid, 1 kg of propionic acid, rotate for 120 minutes, pH is 8, use 1 kg of neutral protease, rotate for 120 minutes, wash with water .

[0047] (3) Non-chrome tanning agent tanning

[0048] Method 1: Use 50 kg of water with a temperature of 18°C, add 4 kg of non-chrome tanning agent I in the drum, rotate for 2 hours, then add 1.0 to 1.6 parts of baking soda (dilute with 10 times of water, add to the drum in 4 times) 60 minutes in total), adjust the pH value of the acid solution to 7.0, then add 50°C hot water to make the temperature inside the drum 35°C, and rotate for 220 minutes.

[0049] Method 2: Use 30 kg of water at a temperature of 32°C, add 8 kg of non-chrome tanning agent II to the drum, rotate for 2 hours, then add 60 kg of ...

Embodiment 2

[0059] (1) Immersion, depilation, and liming are the same as traditional techniques.

[0060] (2) Ammonia-free deashing and softening

[0061] Take 100 kg of cauliflower skin, use 100 kg of water at 33°C, 0.5 kg of formic acid, 3.5 kg of deliming aid, rotate for 150 minutes, adjust the pH to 8.5, use 1.5 kg of neutral protease, rotate for 150 minutes, and wash with water.

[0062] (3) Non-chrome tanning agent tanning

[0063] Method 1: Use 100 kg of water with a temperature of 22°C, add 6 kg of non-chrome tanning agent I in the drum, rotate for 3 hours, then add 1.0 to 1.6 parts of baking soda (dilute with 10 times of water, add to the drum in 4 times) 60 minutes in total), adjust the pH value of the acid solution to 7.5, then add hot water at 60°C to make the temperature inside the drum 45°C, and rotate for 280 minutes.

[0064] Method 2: Use 50kg of water at a temperature of 35°C, add 10kg of non-chrome tanning agent II to the drum, rotate for 2 hours, then add 80 parts of...

Embodiment 3

[0074] (1) Immersion, depilation, and liming are the same as traditional techniques.

[0075] (2) Ammonia-free deashing and softening

[0076] Take 100 kg of cauliflower skin, use 75 kg of water with a temperature of 31.5°C, 0.35 kg of formic acid, and 3 kg of deliming aid, rotate for 135 minutes, adjust the pH to 8.2, use 1.25 kg of neutral protease, rotate for 135 minutes, and wash with water.

[0077] (3) Non-chrome tanning agent tanning

[0078] Method one: use 75 kilograms of water with a temperature of 20 ° C, add 5 kilograms of non-chrome tanning agent I in the drum, rotate for 2.5 hours, then add 1.0 to 1.6 parts of baking soda (dilute with 10 times of water, add to the drum in 4 times) 60 minutes in total), adjust the pH value of the acid solution to 7.2, then add hot water at 55°C to make the temperature inside the drum 40°C, and rotate for 250 minutes.

[0079] Method 2: Use 40kg of water at a temperature of 33.5°C, add 9kg of non-chrome tanning agent II to the dr...

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Abstract

The invention discloses a salt-free, pickling-free, short-process and little-chromium tanning method. At present, finished leather produced by a little-chromium tanning method mostly fails to reach or is not close to the current chromium tanned leather requirement. The method comprises the steps that softened naked leather is directly tanned by a non-chromium tanning agent to form wet white leather; pretreatment is performed on the shaved wet white leather by a polycarboxylic acid assistant; and finally the wet white leather is tanned by little chromium powder to form a salt-free, pickling-free and little-chromium tanned wet blue leather blank. The quality and the performance of tanned wet blue leather can be comparable to wet blue leather obtained by the traditional chromium tanning technique. The method can replace the traditional chromium tanning method; the consumption of a chromium tanning agent is reduced by above 50%; the absorptivity reaches above 90%; the content of Cr2O3 in waste water, the quantity of chromium-containing solid waste and the like are greatly reduced; the chromium tanning time is shortened; and waste of chromium salt and pollution of sodium chloride to a human and an environment in a leather production process are reduced.

Description

technical field [0001] The invention relates to the technical field of leather tanning, in particular to a salt-free, pickling-free, short-process and less-chrome tanning method. Background technique [0002] Chrome tanned leather has good comprehensive properties, so the chrome tanning method has been dominant in the leather industry since its invention. However, due to the low absorption rate of chrome tanning agents and many other factors, the chrome tanning process is also one of the processes that pollute the environment in the tanning process. The annual wastewater produced by my country's leather industry contains 1,300 tons of total chromium, which makes it difficult to control the wastewater to meet the standards. At the same time, there is also pollution caused by chromium-containing solid waste. In addition, the traditional pickling process is required before chrome tanning, and a large amount of industrial salt is added to prevent acid swelling of bare hides, r...

Claims

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Application Information

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IPC IPC(8): C14C3/28C14C3/08C14C3/22C14C3/06C14C1/08
CPCC14C1/08C14C3/06C14C3/08C14C3/22C14C3/28
Inventor 罗建勋冯彦娟
Owner JIAXING UNIV
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