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Method for non-chrome combined tanning of leather based on nanoclay

A nano-clay combined with tanning technology, which is applied in the field of clean tanning, can solve the problems that the shrinkage temperature of leather does not increase significantly and is not enough to meet the requirements of tanning, so as to promote synergistic tanning, improve the stability of moisture resistance and fullness , The effect of simplifying the tanning process

Active Publication Date: 2022-04-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoclay tanning leather alone is still not enough to meet the requirements of tanning, and the shrinkage temperature of leather does not increase significantly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Pickling: At room temperature, put water and softened skin with a weight ratio of 0.6:1 into the drum, add 7% NaCl, and rotate for 10 min; then dilute and add formic acid and sulfuric acid to adjust the pH to 2.8 , rotate for 30 min;

[0018] (2) Tanning: add 2.0% aldehyde and derivative tanning agent, rotate for 3 hours; then add 3.0% nanoclay three times until the pH reaches 5.0, continue to rotate for 60 min; stand overnight, rotate for 30 min the next day to drain wash.

Embodiment 2

[0020] (1) Pickling: At room temperature, put water and softened skin with a weight ratio of 0.7:1 into the drum, add 8% NaCl, and rotate for 10 min; then dilute and add formic acid and sulfuric acid to adjust the pH to 3.0 , rotate for 30 min;

[0021] (2) Tanning: add 8.0% aldehyde and derivative tanning agent, rotate for 3 hours; then add 1.5% nanoclay three times until the pH reaches 5.0, continue to rotate for 60 min; stand overnight, rotate for 30 min the next day to drain wash.

Embodiment 3

[0023] (1) Pickling: At room temperature, put water and softened skin with a weight ratio of 0.8:1 into the drum, add 8% NaCl, and rotate for 10 min; then dilute and add formic acid and sulfuric acid to adjust the pH to 2.9 , rotate for 30 min;

[0024] (2) Tanning: add 6.0% aldehyde and derivative tanning agent, rotate for 2 hours; then add 4.5% nanoclay three times until the pH reaches 5.5, continue to rotate for 60 min; stand overnight, rotate for 30 min the next day to drain wash.

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Abstract

The invention discloses a method for tanning leather based on nano-clay without chrome combination. First, deliming, softening and pickling are performed on the limed leather, and the pH is adjusted to 2.8~3.0, then tanning with 2.0%~8.0% aldehydes and derivatives tanning agent for 2~3 hours, and then adding nanoclay in three times to gradually increase the alkalinity, When the pH of the tanning solution reaches 5.0~5.5, continue to rotate for 60 minutes, let it stand overnight, and rotate for 30 minutes the next day to drain and wash with water. The present invention is based on the combination of nano-clay and aldehydes and derivative tanning agents, which can endow leather with good thermal stability, T s reach above 85°C. The nano-clay used in the present invention, its special structure makes it have self-alkalinization ability, can simplify the tanning process, and its source is extensive, environmental protection is nontoxic; Aldehyde-tanned leather has problems of insufficient light fastness and easy generation of free formaldehyde.

Description

technical field [0001] The invention relates to a method for tanning leather based on nano-clay without chromium combination, and specifically belongs to the technical field of clean tanning. Background technique [0002] Tanning refers to the process of converting raw hides into leather that is not subject to microbial degradation through the interaction between tanning agents and hide collagen. Chromium salt has long been the most widely used tanning agent in the world because it can impart high moisture and heat stability, light weight and softness to leather, as well as the advantages of low cost and strong versatility. However, the current chrome tanning method is still facing severe challenges. The low utilization rate of chrome tanning agents in the traditional chrome tanning process has led to the accumulation of a large amount of difficult-to-treat chrome-containing wastewater and solid waste, and the formation of carcinogenic Cr by Cr(Ⅲ) (VI) Generate environmenta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/08C14C3/08C14C3/16C14C3/04B01D53/02C14C15/00
CPCC14C1/08C14C3/08C14C3/16C14C3/04B01D53/02C14C15/00B01D2257/708
Inventor 林炜肖远航王春华吴晓波张龙
Owner SICHUAN UNIV
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