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Method for tanning high-temperature stable chromium-free costume soft leather

A high thermal stability, tanning technology, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, tanning treatment, etc. Response speed is fast, difficult to produce leather blanks and other problems, to achieve high moisture and heat resistance stability, less chemical emissions, soft hand feeling effect

Inactive Publication Date: 2006-07-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two have a synergistic effect, and the shrinkage temperature of the leather after tanning can reach 100°C (He Xianqi, Wang Yuanliang. Research on the mechanism of vegetable-aluminum combined tanning. China Leather, 25(6): 15-18.), but in industrial production There are two problems in the production process. One is that the reaction speed of vegetable tanning agent and aluminum salt tanning agent is extremely fast, and it is impossible to complete uniform and combined tanning according to the theoretical ratio under the one-time feeding and limited drum speed in production, and it is even more difficult to obtain The industrial production of leather with uniform quality is manifested in the uneven color tone of the leather, and the difference in shrinkage temperature between sheets and different parts of a sheet; the current solution is the saturated tanning method, that is, the use of the largest amount of tanning agent. Raw hides are saturated and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) pickling

[0038] Wash the softened hide with water and control the water, put it into the drum, soften 100 kg of bare hide, put it into the drum, add 60 kg of water with a temperature of 18-22 ° C, and 3 kg of salt in the drum, rotate for 20 minutes, and then add the concentration of 0.3 kilogram of formic acid of 85wt% and concentration are 0.8 kilogram of sulfuric acid of 96wt%, rotate 120 minutes, the pH value of regulating acid solution is 3.8~4.2;

[0039] (2) Tanning 1

[0040] Pour off 40wt% of the total amount of acid solution, add 1 kg of synthetic nitrogen phosphine tanning agent to the remaining 60wt% of the acid solution in the drum, rotate for 2 hours, add 1 kg of baking soda, add in two times, each time at an interval of 30 minutes , adjust the pH value of the bath to 4.5, and then rotate for 60 minutes;

[0041] (3) Tanning 2

[0042] Add 1 kg of auxiliary synthetic tanning agent to the above tanning liquid, rotate to infiltrate evenly, then add 1...

Embodiment 2

[0054] (1) pickling

[0055] Wash the softened skin with water and control the water, put it into the drum, soften 100 kg of bare skin, put it into the drum, add 80 kg of water with a temperature of 18-22 ° C, and 5 kg of salt in the drum, rotate for 30 minutes, and then add the concentration of 0.6 kilogram of formic acid of 85wt% and concentration are 1.2 kilograms of sulfuric acid of 96wt%, rotate 150 minutes, the pH value of regulating acid solution is 4.2;

[0056] (2) Tanning 1

[0057] Pour off 40wt% of the total amount of acid solution, add 4 kilograms of synthetic nitrogen phosphine tanning agent in the acid solution of remaining 60wt% in the drum, rotate for 5 hours, add 2 kilograms of baking soda, add in two times, each interval is 30 minutes, Adjust the pH value of the bath to 5.0, and then rotate for 60 minutes;

[0058] (3) Tanning 2

[0059] Add 3 kg of auxiliary synthetic tanning agent to the above tanning liquid, rotate to infiltrate evenly, then add 20 kg ...

Embodiment 3

[0071] (1) pickling

[0072] Wash the softened skin with water and control the water, soften 100 kg of bare skin, put it into the drum, add 70 kg of water with a temperature of 18-22 ° C, 4 kg of salt, and rotate for 25 minutes. 0.45 kilograms of formic acid and concentration are 1.0 kilograms of sulfuric acid of 9wt%, rotate 135 minutes, the pH value of regulating acid solution is 4.0;

[0073] (2) Tanning 1

[0074] Pour off 40wt% of the total amount of acid solution, add 2.5 kilograms of synthetic nitrogen phosphine tanning agent in the acid solution of remaining 60wt% in the drum, rotate for 4 hours, add 1.5 kilograms of baking soda, add in two times, each interval is 30 minutes, Adjust the pH value of the bath to 4.8, and then rotate for 60 minutes;

[0075] (3) Tanning 2

[0076] Add 2 kg of auxiliary synthetic tanning agent to the above tanning solution, rotate to infiltrate evenly, then add 15 kg of Vitex bark vegetable tanning agent, and rotate for 6 hours. After t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The thermal-stable production method for Cr-free vehicle seat cushion comprises: bating the pig, cattle and sheep shin with modified plant agent, non-Cr sulphate agent and synthetic azophosphon agent; then, currying with high-sulfonated animal/plant oil. The product has shrinkage temperature up to 110Deg, shows well hand feeling and resistance to thermal and age. This invention reduces cost and sewage discharge, improves absorption rate, and exploits a new way for Cr-free leather.

Description

technical field [0001] The invention relates to a tanning method of chrome-free garment soft leather with high thermal stability, belonging to the field of leather tanning. It is suitable for the requirements of pigskin, cowhide and sheepskin garment leather which are currently demanded in the market. The shrinkage temperature and physical and mechanical indicators of the finished leather have reached the chrome-tanned leather standard issued by the Ministry of Industry in 1999. Background technique [0002] Currently worldwide, due to the harmfulness of chromium to humans and the environment, especially the hexavalent chromium converted from trivalent chromium is carcinogenic to humans, and at the same time causes waste of resources and pollution of the environment. Therefore, chromium-free manufacturing is required for medium and high-grade automotive leather. But so far, there is no chrome-free clothing soft leather produced by a complete chrome-free tanning method that...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): C14C3/08C14C3/04
Inventor 罗建勋单志华
Owner SICHUAN UNIV
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