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Method for tanning leather based on nano-clay non-chromium combination

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: 2021-09-17
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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PUM

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Abstract

The invention discloses a method for tanning leather based on nano-clay non-chromium combination. The method comprises the steps that limed leather is subjected to deliming, softening and pickling, the pH is adjusted to 2.8-3.0, then tanning is conducted for 2-3 h through 2.0%-8.0% aldehyde and derivative tanning agents, nanometer clay is added in three times to gradually extract alkali, the pH of tanning liquid is adjusted to 5.0-5.5, rotation continues to be conducted for 60 min, standing is conducted overnight, rotation is conducted for 30 min next day, and liquid discharging and washing are conducted. According to the method for tanning based on the aldehydes and the derivative tanning agents, the leather can be endowed with good thermal stability, and Ts reaches 85 DEG C or above. The special structure of the used nano clay enables the nano clay to have self-alkalization capability, the tanning process can be simplified, and the nano clay is wide in source, environment-friendly and non-toxic; and meanwhile, the nano clay has ultraviolet resistance and formaldehyde adsorption capacity, so that the problems that the aldehyde tanned leather is insufficient in light resistance and easy to generate free formaldehyde can be effectively avoided.

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 Applications(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