Less-chrome tanning technology for tanning sheep skin through nano-composite high absorption chrome tanning assistant

A nano-composite, high-absorbing technology, applied in the field of less chrome tanning process, can solve problems such as few reports and achieve the effect of ensuring stability

Inactive Publication Date: 2014-01-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, according to the leather tanning mechanism and the characteristics of nano-composite materials, chrome-free tann

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: sour skin is weighed, and 80% of weight gain is used as metering basis, and carries out following operation in rotating drum;

[0023] Return water: at room temperature, weigh 200% of the acid skin weight of water, 7% of industrial salt, turn for 10 minutes, then add baking soda diluted 1:20 with water in three times, each interval of 30 minutes, adjust the pH value: 5.5, Check the incision with bromocresol green, it turns blue, turn it for another 30 minutes, and drain;

[0024] Pre-tanning: at room temperature, weigh 80% water and 2% nano-composite high-absorbing chrome tanning auxiliaries by weight of the pickled leather, turn for 2 hours, then add formic acid diluted with water 1:10 in three times, each time at an interval of 30 minutes, and adjust the pH Value: 3.7, turn for another 30 minutes;

[0025] Tanning: at room temperature, weigh 3% chrome powder by weight of the pickle skin, turn it for 1 hour, then weigh 0.5% sodium formate by weight of th...

Embodiment 2

[0027] Embodiment 2: sour peel is weighed, and 80% of weight gain is used as metering basis, and carries out following operation in drum:

[0028] Return water: at room temperature, weigh 200% of the acid skin weight of water, 7% of industrial salt, turn for 10 minutes, then add baking soda diluted with water 1:20 in three times, each interval of 30 minutes, adjust the pH value: 6.5, Check the incision with bromocresol green, it turns blue, turn it for another 30 minutes, and drain;

[0029] Pre-tanning: at room temperature, weigh 80% water and 3.5% nano-composite high-absorbing chrome tanning auxiliaries by weight of the acid hide, turn it on for 2 hours, then add formic acid diluted with water 1:10 in three times, with an interval of 30 minutes between each time, adjust the pH Value: 3.0, turn for another 30 minutes;

[0030] Tanning: at room temperature, weigh the chrome powder with 4% of the weight of the acid skin, turn it for 1 hour, then weigh the sodium formate of 0.5...

Embodiment 3

[0032] Embodiment 3: sour skin is weighed, and 80% of weight gain is used as metering basis, and carries out following operation in drum:

[0033] Return water: at room temperature, weigh 200% of the acid skin weight of water, 7% of industrial salt, turn for 10 minutes, then add baking soda diluted with water 1:20 in three times, each interval of 30 minutes, adjust the pH value: 5.0, Check the incision with bromocresol green, it turns blue, turn it for another 30 minutes, and drain;

[0034] Pre-tanning: at room temperature, weigh 80% water and 4% nano-composite high-absorbing chrome tanning auxiliaries by weight of the pickled leather, turn for 2 hours, then add formic acid diluted with water 1:10 in three times, with an interval of 30 minutes between each time, adjust the pH Value: 2.0, turn for another 30 minutes;

[0035] Tanning: at room temperature, weigh 3% chrome powder by weight of the pickle skin, turn it for 1 hour, then weigh 0.5% sodium formate by weight of the p...

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PUM

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Abstract

The invention belongs to the field of leather tanning technologies, and relates to a less-chrome tanning technology for tanning sheep skin through a nano-composite high absorption chrome tanning assistant. According to the traditional tanning technology, the absorption rate of chrome is not high, so serious waste of chrome resource and pollution are caused and the ecological environment is damaged. According to the tanning theory and the structure characteristics of collagenous fibers and nano-composite high absorption chrome tanning assistant, the nano-composite high absorption chrome tanning assistant and a little of chrome powder are matched and used for tanning goat acid skin, wet blue shrinkage temperature exceeds 100 DEG C, the thickening rate is higher by 50% than that of the leather tanned with conventional 8% of chrome powder, the content of Cr2O3 in the waste liquid is reduced to 50mg/L, and the absorption rate of chrome is improved to be 99%. The mechanical strength of the crust leather is equivalent to normally chrome tanned leather, and SEM (scanning electron microscope) representation results show that the nano-composite high absorption chrome tanning assistant is beneficial to scattering the collagenous fibers, but does not damage the triple helix structure of the collagenous fiber, so that the stability of the collagen structure is guaranteed.

Description

technical field [0001] The invention belongs to the field of leather tanning technology, and in particular relates to a low-chrome tanning technology for tanning sheepskin with a nanocomposite high-absorption chrome tanning auxiliary agent. Background technique [0002] With the strengthening of environmental protection policies and people's awareness of environmental protection in various countries, the tanning industry, which is the second largest polluter in the light industry, is facing a severe test. However, the chrome-free tanning technology that completely abandons chrome tanning and fundamentally eliminates chrome pollution has not yet matured, and there are still shortcomings such as unstable performance of finished leather, complicated process operation, and high cost. The use of high-absorption chrome tanning auxiliaries with simple process and low price can improve the absorption rate of chrome tanning agents, reduce the chromium content in waste liquid, solve e...

Claims

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Application Information

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IPC IPC(8): C14C3/28C14C3/06C14C3/08C14C1/00
Inventor 吕斌刘敏马建中高党鸽
Owner SHAANXI UNIV OF SCI & TECH
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