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Preparation method of lignin-protein filled retanning agent for leather

A retanning agent and lignin technology, applied in the treatment of small hide/big hide/leather/fur, chemical treatment and application of small hide/big hide/leather/fur, and can solve secondary pollution and complicated process , high production cost and other issues, to achieve the effect of no secondary pollution, simple process and low production cost

Active Publication Date: 2010-05-26
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

These modification methods have complex technological processes, high production costs, and secondary pollution.
At present, the technology of modifying the alkaline hydrolyzate of chrome leather shavings with lignin to obtain retanning agent has not been heard of

Method used

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  • Preparation method of lignin-protein filled retanning agent for leather
  • Preparation method of lignin-protein filled retanning agent for leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 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 to fresh chrome leather shavings that have just been peeled off,...

Embodiment 2

[0018] 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.

Embodiment 3

[0020] First, add 0-140 parts by mass of water, 280 parts of chrome leather shavings and 60 parts of potassium hydroxide into the reactor, stir for 5 minutes, add the second part of 280 parts of chrome leather shavings and 55 parts of potassium hydroxide , stirred for 5 minutes, then added 280 parts of chrome leather shavings and 55 parts of potassium hydroxide in the third part, 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.

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Abstract

The invention relates to a preparation method of lignin-protein filling and retanning agent used for leather. The technique is characterized in that the lignin ammonium sulfonate is used for modifyingalkaline hydrolysate of chrome shavings. The invention takes lignin ammonium sulfonate which is waste from paper making industry, is degradable and renewable and rich in resources and the recycled chrome shaving collagen hydrolysate as raw materials for preparing the retanning agent and not only has simple technology, low production cost, no secondary pollution, but also has remarkable selectivefilling function as the filling and retanning agent in leather because of a comparative large distribution range of molecular weight of polypeptides produced by hydrolyzing, thus effectively improvingthe shortages of leather of location difference and loose grain. The product of the invention has good compatibility for the polypeptide structure being similar to leather fiber tissue and the leather after being filled and retanned with the agent can be felt to be smooth and soft, the staining property of the leather can not be affected and the grain surface thereof is delicate and elastic.

Description

technical field [0001] The invention relates to a preparation method of a leather retanning agent, in particular to a preparation method of a lignin-protein filled retanning agent for leather. Background technique [0002] Chrome shavings are scraps that are scraped off from chrome-tanned leather during shaving during the tanning process. my country produces about 280,000 tons of chromium-containing waste every year. At present, most of the chrome leather shavings have to be landfilled because they cannot find suitable uses. Therefore, recycling waste chromium leather shavings and developing reasonable and effective utilization methods not only make full use of resources, but also prevent environmental pollution. This is an important way for the leather industry to change the traditional production mode and take the road of clean production and green leather. [0003] Studies have shown that more than 90% of the ingredients in chrome leather shavings are collagen. Collage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/24
Inventor 宣宏瑜
Owner 鹤山腾泰皮革有限公司
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