Leather tanning method

A leather and tanning technology, which is applied in the field of leather tanning technology, can solve problems such as chromium ion residues, impact on health, and ecological environment hazards, and achieve the effects of less harmfulness, easy control, and reduced dosage

Inactive Publication Date: 2017-05-31
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the above methods, chrome tanning has always been dominant due to its superior tanning properties such as good thermal stability and good formability, but the tanning agent contains hexavalent chromium ions, which are highly toxic, and the wastewater discharged by it causes serious harm to the ecological environment. , and chromium ions are easy to remain in the leather, and long-term exposure will affect health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step a Pre-tanning pretreatment: Soak the dried animal skin in water until softened, and remove the meat and grease attached to the skin with a flat spatula. Then soak the leather in quicklime water for 3 hours, take it out and dry it, depilate it with a spatula, and clean it. Peel the cleaned skin and peel it evenly. After slicing, the leather is soaked in 1% formic acid to soften for 8 hours, and then fully washed with water to obtain the raw hide.

[0031] Step b tanning of tannin: put the pretreated raw hide into the drum, add water, add wattle bark tannin into the drum, the amount of wattle bark tannin is 7% of the weight of the hide, rotate for 150 minutes, and the leather Put it in a water squeezer to squeeze water, and discharge the waste liquid in the drum. After squeezing the water, put the leather back into the drum and rinse with water for 30 minutes, keeping the water temperature in the drum at 35°C. After rinsing, add 0.3% formic acid into the drum, rot...

Embodiment 2

[0035] Step a Pre-tanning pretreatment: Soak the dried animal skin in water until softened, and remove the meat and grease attached to the skin. Then immerse the leather in quicklime water for 4 hours, take it out to dry, depilate with a spatula, and clean it; slice the cleaned leather and peel it evenly. After slicing, the leather is soaked in 2% formic acid to soften for 10 hours, and then fully washed with water to obtain the raw hide.

[0036]Step b tanning of tannin extract: put the raw hide obtained in step a into the drum and add water, add quebra chinensis extract to the drum, the amount of tannin extract is 10% of the weight of the raw hide, rotate the drum for 180 minutes, and the leather Put it in the water squeezer to squeeze the water, and drain the waste liquid in the drum. Put the squeezed leather into the drum and rinse with water for 30 minutes, keep the water temperature in the drum at 40°C, add 0.4% formic acid into the drum after rinsing, and drain the was...

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PUM

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Abstract

The invention provides a leather tanning method. The method comprises the steps of a, pretreatment before tanning, dry animal skin is subject to soaking, meat removal, degreasing, hair removal, splitting and acid maceration, and raw hide is obtained; b, tannin extract tanning, wherein the raw hide is put into a rotary drum, and water and a plant tanning agent are added for plant tanning; c, aluminum tanning, wherein leather is put into the rotary drum, tanning liquid is added, and after tanning, baking soda and sodium acetate are used for neutralizing; d, aftertreatment, wherein through the above steps, finished leather is manufactured. A plant tanning agent and aluminum tanning agent composite tanning method is used for replacing a chromium metal tanning agent for tanning, and on the basis of keeping the tanning effect, the harm of chromium salt to the environment and the human body is removed.

Description

technical field [0001] The invention relates to the technical field of leather production, in particular to a leather tanning process. Background technique [0002] Leather is made of fresh rawhide through dozens of processes such as immersion, degreasing, dehairing, alkali soaking, tanning, trimming, dyeing, and fatliquoring finishing. The most critical process is tanning, which is to convert rawhide into Cooked leather with moisture, that is, semi-finished leather, forms a cross-linked structure between natural protein fibers, thereby improving the chemical and mechanical stability of the leather. The main tanning methods are: 1) Inorganic salt tanning, such as chromium, aluminum and other metal salts form coordination bonds with carboxyl groups on protein fibers; 2) Organic tanning, such as aldehyde compounds, phenolic compounds and protein fibers Amino groups and hydroxyl groups form covalent bonds; 3) Vegetable tanned leather uses high molecular weight substances in pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/02C14C1/04C14C1/08C14C3/10C14C3/28
CPCC14C1/04C14C1/08C14C3/02C14C3/10C14C3/28
Inventor 李军章杨毅华魏云辉齐欢欢
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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