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Novel process for leather retanning

A new process and leather technology, applied in the field of leather making, can solve the problems of occupying land resources, large process water consumption, long process cycle, etc., achieving the effect of good compatibility, high concentration, and overcoming the tightness of the surface.

Active Publication Date: 2008-02-06
鹤山腾泰皮革有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following technical defects in the above-mentioned prior art: 1. produce a large amount of chromium-containing wastes---chrome leather shavings in the smoothing process, and only my country just produces about 280,000 tons of chromium-containing wastes every year, and the most suitable for chrome leather shavings at present The best treatment method is to landfill it, which not only occupies land resources, but also brings environmental pollution; 2. This process produces a large amount of industrial wastewater, the pH of which is 8-10, and the suspended solids are 3000mg / l. Cr 3+ The content is 60~100mg / l, COD Cr 2000~3000mg / l, S 2- (Iodometric method) content of 100 ~ 200mg / l, BOD 5 2200mg / l, Cl - It is 3000mg / l, causing serious pollution to rivers and farmland in my country; 3. The whole process consumes a lot of water, consumes a lot of electric energy, has a long process cycle and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of lignin protein filled retanning agent:

[0034] First, add 0-140 parts by mass of water, 270 parts of chrome leather shavings and 65 parts of sodium hydroxide into the reactor, stir for 5 minutes, add the second part of 270 parts of chrome leather shavings and 60 parts of sodium hydroxide , stirred for 5 minutes, then added 270 parts of chrome leather shavings and 60 parts of sodium hydroxide in the third part, stirred for 20 minutes, and the reactant was a uniform paste. Add 72 parts of ammonium lignosulfonate, and continue stirring for 12 hours. Then 55 parts of formic acid are added dropwise in a trickle, and the control time is 3 hours, and 100 parts of sulfuric acid are added dropwise in a trickle, and the control time is 3 hours. Check the pH value of the 1:10 aqueous solution of the reactants to be 7.5 to 8.0. It should be noted that the specific amount of water depends on the dryness and wetness of the chrome leather shavings. No water is added ...

Embodiment 2

[0045] Preparation of lignin protein filled retanning agent:

[0046] First, add 0-140 parts by mass of water, 250 parts of chrome leather shavings and 65 parts of sodium hydroxide into the reactor, stir for 5 minutes, add the second part of 250 parts of chrome leather shavings and 65 parts of sodium hydroxide , stirred for 5 minutes, then added 250 parts of the 3rd part of chrome leather shavings and 60 parts of sodium hydroxide, stirred for 20 minutes, and the reactant was a uniform paste. Add 75 parts of ammonium lignosulfonate, and continue stirring for 12 hours. Then 60 parts of formic acid are added dropwise in a trickle, and the control time is 3 hours, and then 100 parts of sulfuric acid are added dropwise in a trickle, and the control time is 3 hours. Check the pH value of the 1:10 aqueous solution of the reactants to be 7.5 to 8.0.

[0047] Retanning process:

[0048] Washing water: put the shaved blue skin and 150% water of blue skin weight into the drum, and the...

Embodiment 3

[0055] Preparation of lignin protein filled retanning agent:

[0056] First, add 0-140 parts by mass of water, 280 parts of chrome leather shavings and 60 parts of sodium hydroxide into the reactor, stir for 5 minutes, add the second part of 280 parts of chrome leather shavings and 55 parts of sodium hydroxide , stirred for 5 minutes, then added 280 parts of the third part of chrome leather shavings and 55 parts of sodium hydroxide, stirred for 20 minutes, and the reactant was a uniform paste. Add 70 parts of ammonium lignosulfonate, and continue stirring for 12 hours. Then add 50 parts of formic acid dropwise in a trickle for a control time of 3 hours, then add 80 parts of sulfuric acid dropwise in a trickle for a control time of 3 hours. Check the pH value of the 1:10 aqueous solution of the reactants to be 7.5 to 8.0.

[0057] Retanning process:

[0058] Washing water: put the shaved blue skin and 170% water of blue skin weight into the drum, and then add 0.10% formic ac...

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PUM

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Abstract

The present invention relates to a novel process for leather tanning. The process course includes watering, neutralizing, dyeing, fatting, fastening, and watering. The main improvement is to use the process castoff chrome leathermeal which is produced during smooth paring as the tanning agent, and other tanning agent as the acrylics and the mimosa extract are compounded simultaneously, and a novel tanning dyeing drum is introduced into, so that the recycle of the waste resource is realized, the environment pollution is reduced, the electric consumption and the energy consumption are saved, and the cost is lowered.

Description

technical field [0001] The invention belongs to the field of tanning, in particular to a new leather retanning process. Background technique [0002] The existing basic process of tanning is as follows: pre-tanning raw material hides, then chrome tanning, washing water after wet blue leather, squeezing water, peeling, and then retanning chrome, alkali extraction and neutralization, dyeing, adding Fat, finally fix the color, and finish the finished leather. There are following technical defects in the above-mentioned prior art: 1. produce a large amount of chromium-containing wastes---chrome leather shavings in the smoothing process, and only my country just produces about 280,000 tons of chromium-containing wastes every year, and the most suitable for chrome leather shavings at present The best treatment method is to landfill it, which not only occupies land resources, but also brings environmental pollution; 2. This process produces a large amount of industrial wastewater, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/00
Inventor 宣宏瑜
Owner 鹤山腾泰皮革有限公司
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