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Fur tanning method based on bio-based epoxy active tanning agent

A bio-based, tanning technology, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, chemical treatment before tanning, etc. It can solve the problems of formaldehyde residue and pollution

Active Publication Date: 2021-08-10
NINGXIA WUZHONG JINGYI FUR PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a kind of fur tanning method based on bio-based epoxy active tanning agent, to solve the problems of chromium, formaldehyde residue and pollution in the existing fur tanning method, and improve the tanning after tanning simultaneously. The quality of the coat and coat of the fur

Method used

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  • Fur tanning method based on bio-based epoxy active tanning agent
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  • Fur tanning method based on bio-based epoxy active tanning agent

Examples

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Effect test

Embodiment 1

[0044] In this embodiment, the method of the present invention is used to tan Tan sheepskin. The raw material skin used is salt-dried Tan sheep second fur. According to the size of the skin and the quality of the wool, the batches are carried out based on the principle that the size of the skin and the quality of the wool are similar. After tanning, because the wool fiber of the raw hide is long and spike-shaped, in order to prevent the wool from knotting during the tanning process, the liquid coefficient in the processing process is relatively large, usually controlled at about 18L / sheet. Specific steps are as follows:

[0045] (1) Soften

[0046] The raw skins are soaked in water, fleshed and degreased according to the conventional process.

[0047] Add water and sodium chloride to the groove, stroke the groove for 10 minutes, add formic acid to adjust the pH value to 3.5 after the sodium chloride is dissolved, add Angellzym HA protease (Tianjin Triumph, enzyme activity 200...

Embodiment 2

[0058] In this embodiment, sheep sheared fur is tanned by the method of the present invention, and the raw material skin used is salted Merino sheep skin, which is dry sheared. Adult Merino sheepskins are relatively large, so they are sheared before processing, so wet processing is not prone to napping problems, and tanning can be carried out in drums or slots, and the liquid coefficient is usually controlled at about 20L / sheet when tanning in slots . Specific steps are as follows:

[0059] (1) Soften

[0060] The raw skins are soaked in water, fleshed and degreased according to the conventional process.

[0061] Add water and sodium chloride to the groove, stroke the groove for 10 minutes, add formic acid to adjust the pH value to 3.5 after the sodium chloride is dissolved, then add 537 acid protease (enzyme activity is 2000~3000U / L), stroke The softening solution was formed in the tank for 30 minutes. In the softening solution, the concentration of sodium chloride was 45g...

Embodiment 3

[0072] In this embodiment, sheep sheared fur is tanned by the method of the present invention, and the raw material skin used is salted Merino sheep skin, which is dry sheared. Adult Merino sheepskins are relatively large, so they are sheared before processing, so wet processing is not prone to napping problems, and tanning can be carried out in drums or slots, and the liquid coefficient is usually controlled at about 20L / sheet when tanning in slots . Specific steps are as follows:

[0073] (1) Soften

[0074] The raw skins are soaked in water, fleshed and degreased according to the conventional process.

[0075] Add water and sodium chloride to the groove, stroke the groove for 10 minutes, add formic acid to adjust the pH value to about 7.0 after the sodium chloride is dissolved, then add DOWELLZYM OS protease (enzyme activity is 1000-1200U / L), stroke The softening solution was formed in the tank for 30 minutes. In the softening solution, the concentration of sodium chlori...

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Abstract

The invention provides a fur tanning method based on a bio-based epoxy active tanning agent, the method comprises the processes of softening, pickling and tanning, or comprises the processes of softening and tanning, and comprises the following steps: (1) putting pretreated fur into softening liquid in a paddle-tumbler for softening; after softening, pickling and then tanning, or directly tanning after softening; (2) pickling: adding organic acid and inorganic acid into the softening liquid in the paddle-tumbler to form pickling liquid for pickling; and (3) adjusting the pH value of the pickled or softened bath liquid to 2.0-5.0, adding a tanning aid and a bio-based epoxy active tanning agent, paddling a paddle for 20-40 minutes, then intermittently paddling for 6-8 hours, standing for 12-15 hours, adding a basifier into the bath liquid to extract alkali, adjusting the temperature of the bath liquid to 35-50 DEG C, intermittently paddling for 2-3 hours, standing for 12-15 hours, and discharging the fur. According to the method, the problems of chromium and formaldehyde residues and pollution existing in an existing fur tanning method can be solved, and the quality of the fur plate and the fur quilt of the tanned fur can be improved.

Description

technical field [0001] The invention belongs to the field of fur tanning processing, and relates to a fur tanning method based on a bio-based epoxy active tanning agent. Background technique [0002] In recent years, my country's fur industry has developed rapidly, but fur tanning technology is still relatively backward. The tanning of bulk fur, such as sheep fur, sheep shearling, beach sheepskin and lamb skin, still mainly uses formaldehyde or formaldehyde-aluminum or formaldehyde- Chrome salt tanning process. Although these tanning processes have the characteristics of low cost, mature process, easy operation and white coat, there are problems affecting the health of operators and environmental pollution. What is more serious is that there are A large amount of free formaldehyde cannot be effectively removed even if a formaldehyde remover is added in the post-finishing process. The product will continuously release formaldehyde during use or storage, which will pose a pote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/08C14C3/08
CPCC14C1/08C14C3/08
Inventor 张宗才马维宁毛博周平秦涛
Owner NINGXIA WUZHONG JINGYI FUR PROD
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