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A kind of preparation method of chrome-free leather

A technology for chrome leather and tare weight, applied in the field of chrome-free leather preparation, can solve the problems of environmental pollution and increase the complexity of the process, and achieve the effects of reducing environmental pollution, shortening the production cycle and reducing the process.

Active Publication Date: 2021-06-29
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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  • A kind of preparation method of chrome-free leather
  • A kind of preparation method of chrome-free leather
  • A kind of preparation method of chrome-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 chrome-free leather. Firstly, the bare leather is dehydrated with an organic solvent 1 until the water content is lower than 10%, to obtain wet white leather, and the organic solvent is recovered; 2. Tare 2%-20% reactive substance, rotate for 120-600min, recover the bath liquid; finally dry, dyeing and filling operations can also be performed before drying. The invention prepares wet white leather through solvent dehydration, then adds reactive substances to react with hydrophilic groups on collagen fibers, seals the hydrophilic groups, improves water resistance, thereby fully and permanently fixing the fiber-dispersed leather, and finally achieves chrome-free The preparation of leather is characterized by short production cycle, simple and easy operation, and the prepared leather has good softness, excellent air permeability and strong tensile strength.

Description

technical field [0001] The invention belongs to the field of leather tanning processing, and in particular relates to a preparation method of chromium-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] Conve...

Claims

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Application Information

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Patent Type & Authority Patents(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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