A kind of production method of transparent leather

A production method and leather technology, applied in leather surface treatment, special leather manufacturing, small raw hide/big raw hide/leather/fur treatment, etc., can solve the problem that transparent leather production methods have not been reported, and the quality of finished products is difficult to be guaranteed and reduced. Physical and mechanical properties of leather and other issues, to achieve the effect of strong practicability, flexible production, and simple operation

Active Publication Date: 2021-10-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, excessive expansion of bare leather, especially acid expansion, will greatly reduce the physical and mechanical properties of leather. In severe cases, even rotten skin accidents will occur during the expansion process. Therefore, there are certain risks in the production process of this method. also difficult to guarantee
In addition, there is no report about the production method of transparent leather

Method used

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  • A kind of production method of transparent leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The deashed and softened pig head skin (thickness 1.0mm) is fully washed in the drum until the total ash content of the bare hide is less than 0.5%, and then it is taken out of the drum for 30 minutes, and weighed as the following operating materials; The polyoxypropylene stearate surfactant (HLB value 8.0) is dissolved in water with 10% of the weight of the bare hide, and then added to the drum, and rotated for 60 minutes after casting the skin; dissolve an appropriate amount of sodium hydroxide with 15% of the weight of the bare hide, Add to the drum in 4 times, rotate the drum for 20 minutes after each addition, and continue to rotate for 45 minutes after the addition. At this time, the pH value of the bath liquid is 11.5; the skins that have completed the above operations are taken out of the drum and then stretched to dry. The drying temperature is 35 ℃, the production of transparent leather is completed after complete drying.

Embodiment 2

[0022] The deashed and softened pig split skin (thickness 0.5mm) is fully washed in the drum until the total ash content of the bare hide is less than 0.2%, and then it is taken out of the drum for 30 minutes, and weighed as the following operating material benchmark; % of sorbitan trioleate surfactant (HLB value 1.8) is dissolved in 20% of the weight of bare hide in water, then added to the drum, and rotated for 30 minutes after casting the skin; dissolve an appropriate amount of sodium carbonate with 5% of the weight of bare hide in water , adding to the drum in 2 times, rotating the drum for 10 minutes after each addition, and continuing to rotate for 15 minutes after adding, at this time, the pH value of the bath solution is 9.5; after the above-mentioned operations are completed, the skin is stretched out of the drum and dried on a stretcher. 35°C, the production of transparent leather is completed after complete drying.

Embodiment 3

[0024] The deashed and softened cow split hide (thickness 2.0mm) is fully washed in the drum until the total ash content of the bare hide is less than 0.5%, and then it is taken out of the drum for 30 minutes, and weighed as the following operation material benchmark; % ethylene glycol fatty acid ester surfactant (HLB value 2.7) is dissolved in 15% water of the weight of bare skin, and then added to the drum, and rotated for 180 minutes after casting the skin; dilute an appropriate amount of formic acid with 10% water of the weight of bare skin, and divide it into 3 Add to the drum one time, and rotate the drum for 60 minutes after each addition, and continue to rotate for 90 minutes after the addition. At this time, the pH value of the bath liquid is 4.3; after the skins that have completed the above operations are taken out of the drum, they are stretched and dried at a drying temperature of 30 ° C. The production of transparent leather is completed after complete drying.

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Abstract

The production process of the transparent leather disclosed by the present invention is divided into four steps: 1. The bare leather after deliming and softening is fully washed with water until the total ash content is less than 0.5%, and then drummed for 30 minutes, and weighed as the following operation material reference; 2. Dissolve multifunctional amphiphilic substances such as surfactant or leather fatliquoring agent with appropriate amount of water and add them to the drum, then cast the skin and rotate for at least 30 minutes; 3. Dissolve or dilute the acid or alkali with appropriate amount of water and add to the drum gradually , rotate the drum for at least 10 minutes after each addition, and continue to rotate for at least 15 minutes after adding all acids or alkalis, and control the pH value of the bath solution to 3.5‑5.5 or 9.5‑11.5; 4. Stretch the plate when it is not higher than 35 °C After drying, the production of transparent leather is completed. The equipment and materials used in the method disclosed by the invention are widely used by tanning enterprises, and the material type, dosage and processing parameters can be adjusted according to product requirements, and the method has strong practicability. At the same time, during the production process, the bare leather no longer undergoes violent expansion, and there will be no production accidents of rotten leather. The operation is simple and the risk is small.

Description

technical field [0001] The invention belongs to the technical field of leather production and processing, and in particular relates to a production method of leather with good softness and light transmission. Background technique [0002] Leather production is the production of natural polymer materials with a certain softness, fullness, chemical and microbial degradation resistance through a series of complex physical, chemical and mechanical processing of various animal skin by-products produced by animal husbandry and meat processing industries. . As we all know, conventional leather, whether it is shoe upper leather, garment leather, sofa leather or luggage leather, is a soft opaque sheet material. Some special-purpose leathers, such as drumheads for traditional drums and parchment for writing, have a certain degree of light transmittance, but these leathers are often hard and brittle, and will produce creases that are difficult to recover after bending. Even breakage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C11/00C14C13/00C14C1/08
CPCC14C11/00C14C11/003C14C13/00
Inventor 张金伟
Owner SICHUAN UNIV
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