Ecological bating method

A tanning and ecological technology, applied in the field of leather production, can solve the problems of low shrinkage temperature, affecting the dyeing process, etc., and achieve the effect of enhancing bonding performance, good hand feel, and improved hand feel

Active Publication Date: 2007-10-10
XUZHOU XINGNING LEATHER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an ecological tanning method based on organic phosphine tanning method, which can overcome the disadvantages of low shrinkage temperature of single organic phosphine tanning method and affect the subsequent retanning and dyeing process, and can make full use of the leather produced in the leather production process. collagen waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Collagen preparation: Add 100 grams of shaved chrome chips into a 500ml three-necked bottle, add 400 grams of water and 4 grams of magnesium oxide, heat up to 95°C in a water bath, hydrolyze for 3 hours under stirring, then cool down to 50°C, add 2709 0.3 g of enzyme, continue to hydrolyze for 1 hour under stirring, then raise the temperature to 90° C. and keep it for 30 minutes, filter, adjust the pH value of the solution to about 7, and measure the protein content of the obtained collagen solution product.

[0034] Raw materials: Lied hides are obtained after washing, deliming, softening and washing. The following percentages are based on the weight of limed hides.

[0035] Pickling: 80% water, room temperature, 8% salt, turn for 10 minutes

[0036] Formic acid 0.7%, rotate for 30 minutes

[0037] Sulfuric acid 0.8%, rotate for 2 hours, pH is about 2.8;

[0038] Tanning: Add 0.6% aldehyde tanning agent to the above pickling solution and turn it for 30 minutes

[00...

Embodiment 2

[0045] Raw materials: Lied hides are obtained after washing, deliming, softening and washing. The following percentages are based on the weight of limed hides.

[0046] Pickling: 80% water, room temperature, 8% salt, turn for 10 minutes

[0047] Formic acid 0.7%, rotate for 30 minutes

[0048] Sulfuric acid 0.8%, rotate for 2 hours, pH is about 2.8;

[0049] Tanning: Add 1% aldehyde tanning agent to the above pickling solution and turn it for 30 minutes

[0050] Tetrahydroxymethylphosphine chloride 2%, turn 2 hours

[0051] 1.2% baking soda, diluted 20 times with water, added in four times, each interval is 30 minutes, adjust the pH value to 4.0-4.5, rotate for 60 minutes

[0052] Add collagen powder 3% by dry weight and turn for 60 minutes

[0053] Add 80% hot water at 60°C, continue to rotate for 60 minutes, turn and stop to combine overnight, and the total tanning time is 18 hours.

[0054] The operation of the retanning section is the same as the general method.

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Abstract

This invention provides an ecological tanning method. The method comprises: pre-tanning with aldehyde tanning agent, tanning with tetrahydroxymethyl phosphonium salt, and then adding collagen to enhance the bonding of the tanning agents. The method utilizes the reaction among aldehyde tanning agent, tetrahydroxymethyl phosphonium salt and collagen to enhance the bonding of the tanning agents as well as increase the shinkage temperature. Besides, the addition of collagen can improve the comprehensive properties of leather and reduce the aldehyde content in leather. The method can be used to replace chrome tannage, thus can avoid the harm of chrome salt to human body and environment.

Description

technical field [0001] The invention belongs to the clean production technology in the technical field of leather production, and in particular relates to a novel tanning method. Background technique [0002] Tanning is the most critical process in leather production. After the tanning process, the raw hide protein is cross-linked and denatured to obtain properties such as moisture and heat resistance and microbial resistance. The structure of the raw hide undergoes qualitative changes and becomes a valuable product leather. Among the many tanning methods developed, the chrome tanning method has been occupying a dominant position due to its superior tanning performance since its inception, and has become an indispensable tanning material in modern leather production. Although chrome tanned leather has good moisture resistance, stability, softness and plumpness, and good formability, its disadvantage is that chromium salts pollute the environment. The pollution of the enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08
Inventor 吴华春蔡建设胡斌贾继章
Owner XUZHOU XINGNING LEATHER CO LTD
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