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Preparation method of chromium-free leather

A technology of chrome leather and tare weight, which is applied in the field of chrome-free leather preparation, can solve problems such as increased process complexity and environmental pollution, and achieve the effects of shortening the production cycle, reducing environmental pollution, and strong tensile strength

Active Publication Date: 2019-01-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The exchange of solvent system and water system increases the complexity of the process and brings new environmental pollution

Method used

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  • Preparation method of chromium-free leather
  • Preparation method of chromium-free leather
  • Preparation method of chromium-free leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037](1) Solvent dehydration: first place the pickled skin in a drum, wash it with water to remove the salt, and then dehydrate the skin with a step-by-step dehydration method, that is, first use 400% absolute ethanol solution to dehydrate twice, each time 120min; Then use the mixed solution of 400% absolute ethanol and acetone (mass ratio is 1:1) to dehydrate 1 time, 120min; finally use 400% acetone solution to dehydrate 1 time, 120min, get the wet white skin with fiber dispersion at this time, recycle Organic solvents;

[0038] (2) Block the hydrophilic group: add tare 40% acetone, tare 4% IPDI trimer, rotate for 360 minutes, so that the IPDI trimer is well penetrated and reacted in the skin, and then recover the bath liquid;

[0039] (3) Drying: take out the treated leather from the drum, hang it to dry, and obtain the fiber-fixed chrome-free leather.

Embodiment 2

[0041] (1) Solvent dehydration: first place the pickled skin in a drum, wash it with water to remove the salt, and then dehydrate the skin with a step-by-step dehydration method, that is, first use 400% absolute ethanol solution to dehydrate twice, each time 120min; Then use the mixed solution of 400% absolute ethanol and acetone (mass ratio is 1:1) to dehydrate 1 time, 120min; finally use 400% acetone solution to dehydrate 1 time, 120min, get the wet white skin with fiber dispersion at this time, recycle Organic solvents;

[0042] (2) Block the hydrophilic group: add 40% tare acetone and 4% tare IPDI trimer, rotate for 360 min, and recover the bath liquid.

[0043] (3) Filling: Add 40% tare acetone and 10% tare white oil, rotate for 120min, and recover the bath liquid.

[0044] (4) Drying: The treated leather is taken out from the drum and dried in vacuum to obtain fiber-fixed chrome-free leather.

Embodiment 3

[0046] (1) Solvent dehydration: first place the softened skin in a drum, and then dehydrate the skin with a step-by-step dehydration method, that is, dehydrate with 400% absolute ethanol solution twice, each time for 120min; The mixed solution of water ethanol and acetone (mass ratio is 1:1) is dehydrated once for 120 minutes; finally, it is dehydrated once with 400% acetone solution for 120 minutes. At this time, wet white leather with fiber dispersion is obtained, and the organic solvent is recovered in each step;

[0047] (2) Block the hydrophilic group: add tare 100% acetone, tare 1.5% IPDI trimer, rotate for 60 min, then add tare 2.5% IPDI trimer, rotate for 240 min, and recover the bath liquid.

[0048] (3) Drying: The treated leather is taken out from the drum, and stretched to dry to obtain fiber-fixed chrome-free leather.

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Abstract

The invention discloses a preparation method of chromium-free leather. Firstly naked leather is dehydrated by adopting an organic solvent 1 till the water content is lower than 10%, white wet leatheris obtained, and the organic solvent is recycled; an organic solvent 2 with the tare weight being 30-200% and a reactive substance with the tare weight being 2-20% are added and rotated for 120-600 minutes, and bath liquid is recycled; and finally drying is conducted, and dyeing and filling operations can be done before drying. The white wet leather is prepared through dehydration by adopting thesolvent, then the reactive substance is added to react with the hydrophilic group on the collagenous fiber, the hydrophilic group is blocked, the waterproof performance is improved, accordingly the leather with fiber dispersed is sufficiently and durably fixed, and preparation of the chromium-free leather is finally achieved. The preparation method is characterized in that the production period isshort, the procedure is simple and easy to operate, the prepared leather has the good softness, good gas permeability and high tension stress.

Description

technical field [0001] The invention belongs to the field of leather tanning processing, and in particular relates to a preparation method of chrome-free leather. Background technique [0002] Chrome tanning, which has a history of more than 100 years, has been the mainstream technology of leather tanning because it can impart excellent performance to leather, and it is almost unshakable. The tanned leather needs to go through the processes of rewetting, chrome retanning, neutralization, filling, dyeing, fatliquoring, etc. before it can be used. With the development of the global economy and the progress of society, the enhancement of people's awareness of environmental protection and the lack of chromium resources, the pollution of chromium, the safety problems of wearing chrome-tanned leather products and the disposal of waste chrome-tanned leather products are increasingly concerned. Therefore, chrome-free tanned leather is the future development trend. [0003] Convent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/00C14C3/22C14B1/58
CPCC14B1/58C14C1/00C14C3/22
Inventor 周建飞何秀石碧王亚楠曾运航
Owner SICHUAN UNIV
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