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Method for producing transparent leather based on organic tanning agent

A tanning agent and organic technology, applied in the field of leather processing and manufacturing, can solve the problems of poor durability, increase light transmittance, disadvantages, etc., and achieve the effect of wide application, high safety and strong practicability

Active 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

However, in the current production methods of transparent leather, except for a method for preparing transparent leather by soaking chrome-tanned leather in ionic liquid (transparent leather and its preparation method, CN110184398A), although the transparent leather prepared by this method has a high shrinkage temperature, the final The product will inevitably have the blue color of chrome tanned leather, which is not conducive to improving light transmittance and processing transparent leather of other colors
Using the delimed and softened bare leather as raw material, the transparent leather can also be prepared by treating with multifunctional active substance (a production method of transparent leather, CN111455118A) or polyol (a kind of transparent leather and its manufacturing method, CN108998600A). Although the product produced by this method has high light transmittance and is colorless, the transparent leather has not been tanned and has poor durability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put the deashed and softened pigskin with a thickness of 0.5mm into the drum, and use tetrakis hydroxymethyl phosphorus chloride for tanning. The amount of tanning agent is 0.5% of the mass of the deashed and softened hide. 100%, the tanning drum rotates for a total of 4 hours, the temperature in the first 1 hour of tanning is 25°C, and the temperature in the last 3 hours of tanning is 40°C; after the tanning is completed, the tanning waste liquid is drained, and water with a quality of 100% of the weight of the deashed and softened bare hide is added. , 10% ethylene glycol and 5% dipropylene glycol, rotate at 25°C for 2h; then add formic acid in 2 times, rotate for 0.5h after each addition, adjust the pH value of the bath to 3.8; finally, complete The above-mentioned leather stretcher is dried until the moisture content is lower than 20%, that is, the production of transparent leather is completed.

Embodiment 2

[0017] Put the 0.8mm thick deashed and softened pig second-layer bare hide into the drum, and use tetrakis hydroxymethyl phosphorus sulfate for tanning. The amount of tanning agent is 0.8% of the mass of the deashed and softened bare hide. 90%, the tanning drum rotates for a total of 4 hours, the temperature in the first 2 hours of tanning is 25 °C, and the temperature in the last 2 hours of tanning is 40 °C; after the tanning is completed, the tanning waste liquid is drained, and water with 100% of the quality of the deashed and softened bare hide is added. , 15% glycerol and 8% mannitol, rotate at 35°C for 2.5 hours; then add lactic acid in 2 times, rotate for 1 hour after each addition, adjust the pH value of the bath to 4.5; finally, the above operations will be completed The leather stretcher is dried until the moisture content is lower than 20%, that is, the production of transparent leather is completed.

Embodiment 3

[0019] Put the deashed and softened bovine split hide with a thickness of 1.2mm into the drum, and use polyurethane sulfonate tanning agent for tanning. The amount of tanning agent is 3% of the mass of the deashed and softened hide. The ratio of tanning solution is 60%, the drum in tanning is rotated for 8 hours, the temperature in the first 3 hours of tanning is 32°C, and the temperature in the last 4 hours of tanning is 35°C. 100% water, 20% diethylene glycol and 15% sorbitol, rotate at 35°C for 6 hours; then add acetic acid in 2 times, rotate for 2 hours after each addition, adjust the pH value of the bath to 4.0; finally, put The leather stretcher that has completed the above operations is dried until the moisture content is lower than 20%, that is, the production of transparent leather is completed.

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Abstract

A method for producing transparent leather based on an organic tanning agent is characterized by comprising the steps of firstly, using the organic tanning agent in a rotary drum for tanning deashed and softened bare leather, wherein the tanning liquid ratio is 60-100%, the temperature is 25-40 DEG C, and the total rotating time is 4-8 h; after tanning is completed, completely discharging tanningwaste liquid, adding water accounting for 100% of the mass of the deashed and softened bare leather and a proper amount of polyhydric alcohol, and conducting rotating for 2-6 hours at the temperatureof 25-35 DEG C; then adding acid substances in two times, conducting rotating for 0.5-2 h after each time of adding, and adjusting the pH value of the bath lotion to 3.5-4.5; and finally, conducting toggle drying on the leather subjected to the above operation until the moisture content is lower than 20%, thereby completing the production of the transparent leather. According to the transparent leather production method, the organic tanning agent is used in the production process, the shrinkage temperature, chemical resistance and microbial degradation resistance of the leather can be improved, meanwhile, the obtained transparent leather retains the natural color, the operation process in the production process is simple, and the used chemical materials are wide in source, small in toxic and side effect and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of leather processing and manufacturing, and in particular relates to a method for pre-tanning with an organic tanning agent and soaking in an organic solvent to produce transparent leather. Background technique [0002] Transparent leather has a light transmission like glass and some plastics, which is a significant difference from the opaque appearance of traditional leather. At present, transparent leather has been used to process shoes and clothing, etc., and the leather products produced are fashionable and popular among consumers. However, in the current production methods of transparent leather, except for a method for preparing transparent leather by soaking chrome-tanned leather in ionic liquid (transparent leather and its preparation method, CN110184398A), although the transparent leather prepared by this method has a high shrinkage temperature, the final The product will inevitably have the blue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08C14C3/22C14C3/26C14C11/00
CPCC14C3/08C14C3/22C14C3/26C14C11/00
Inventor 张金伟何秀
Owner SICHUAN UNIV
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