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Method for preparing transparent leather based on solution refractive index

A refractive index, solution technology, applied in leather surface treatment, special leather manufacturing, small raw hide/large raw hide/leather/fur treatment, etc. A wide range of sources, easy to promote and implement, and simple to operate

Inactive Publication Date: 2021-02-05
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the currently disclosed materials, there is one that uses ionic liquid soaking to prepare transparent leather (transparent leather and its preparation method, CN110184398A), this method requires special ionic liquids, and the processing method is complicated
Preparation of transparent leather by soaking in surfactant or fatliquoring agent (a production method of transparent leather, CN111455118A), although the processing method is simple, the choice of materials is relatively limited
Drying the swollen skin and then soaking it in a transparent solution can also prepare transparent leather (a transparent leather and its manufacturing method, CN108998600A), but this method has a long process and many processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put the pig split skin skin with a thickness of 0.6mm after being processed according to the conventional tanning preparation section into the drum, and then add a polyol solution with 60% weight of the skin and rotate for 1 hour. The mass fraction of ethylene glycol in the polyol solution is 30%, and the refractive index of ethylene glycol is 1.43; then add formic acid in 2 times, rotate for 0.5h after each addition, and adjust the pH value of the solution to 3.6; finally take out the bare hide for stretch board drying, the drying temperature is 40 ° C, when The preparation of transparent leather is completed when the dry basis moisture content of bare hide is reduced to below 15%.

Embodiment 2

[0016] Put the bovine split skin bare hide with a thickness of 1.2mm after the conventional tanning preparation section into the drum, then add a polyol solution with 150% weight of the bare hide and rotate for 6 hours. The mannitol in the polyol solution accounts for 10% by mass fraction. %, the refractive index of mannitol is 1.59; then add formic acid in 3 times, rotate for 2 hours after each addition, and adjust the pH value of the solution to 4.5; finally take out the bare skin and dry it on a nail board at a drying temperature of 30°C. The preparation of transparent leather is completed when the base moisture content is reduced to below 15%.

Embodiment 3

[0018] Put the 0.7mm-thick pigshead bare hide into the drum after being treated in the conventional tanning preparation section, then add a polyol solution with 100% weight of the bare hide and rotate for 3 hours. The mass fraction of sorbitol in the polyol solution is 12%. , the refractive index of sorbitol is 1.31; then add formic acid in 3 times, rotate for 1 hour after each addition, and adjust the pH value of the solution to 4.2; finally take out the bare skin and dry it on a nail plate at a drying temperature of 35°C. The preparation of transparent leather is completed when the moisture content drops below 15%.

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Abstract

The invention discloses a method for preparing transparent leather based on solution refractive index. The method is characterized by comprising the following steps: putting bare leather treated in aconventional tanning preparation section into a rotary drum, adding a proper amount of polyol water solution, and conducting rotating for at least 1 hour, wherein the refractive index of the polyol is1.31-1.59; then adding formic acid for 2-3 times, conducting rotating for 0.5-2 h after each time of addition, and adjusting the pH value of the solution to 3.6-4.5; and finally, taking out the bareleather, conducting constrained drying at a drying temperature of not higher than 40 DEG C, and when the moisture content of the bare leather dry basis is reduced to 15% or below, finishing preparation of the transparent leather. Existing equipment and raw materials of a tannery are used, polyol which is widely used in industry, safe and non-toxic is adopted for treating bare leather according toconventional tanning processing operation to prepare the transparent leather, and the method has the advantages of being easy to operate, safe, reliable and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of special leather processing and manufacturing, and in particular relates to a method for preparing transparent leather based on the principle of light refraction. Background technique [0002] With the development of the times, consumers are increasingly pursuing personalization and differentiation, and their requirements for leather are becoming more and more novel and peculiar. People hope that leather products can be as transparent as plastic and glass. However, the leather currently used for processing shoes, bags, belts, clothing and furniture, etc. is opaque, and only some special-purpose leathers have a certain degree of light transmission, such as the raw materials for making shadow puppets in traditional shadow puppets, and used as writing materials. parchment, skins for drums, etc. Although these special leathers are light-transmitting, they are often hard, brittle, and not easy to bend. Some of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C11/00C14C13/00
CPCC14C11/00C14C13/00
Inventor 张金伟何秀
Owner SICHUAN UNIV
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