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Salt-free pickling-free less-chrome combination tanning method for first layer cattle shoe upper leather

A head-layer cowhide, combined with tanning technology, is applied in the field of salt-free pickling-free tanning technology of cowhide softened skin to achieve the effects of reducing dosage, reducing content and reducing pollution

Inactive Publication Date: 2014-01-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on non-pickling tanning mainly focuses on the modification of chrome tanning agent (Chen Zhanguang, Chen Wuyong. Development and performance characterization of non-pickling chrome tanning agent[J]. China Leather, 2001, 30 (23): 6 -10.) and process research (Yang Xiping, Zhang Shufang, Ma Xingyuan. Preliminary research on non-pickling high pH chrome tanning based on chromium formate [J]. West Leather, 2013, 42 (04): 6-10.), related to the combination of two sexes There are few reports on the application of polymer-based nano-composite low-chrome tanning auxiliaries combined with conventional chrome tanning agents in non-pickling tanning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: The softened skin is weighed, and the weight gain is 50% as the basis of measurement, and the following operations are carried out in the drum;

[0022] Backwater: at room temperature, weigh the water that softens 70% of the skin weight after weight gain, and turn it for 15 minutes; then adjust the pH to 5.5 with formic acid diluted with water at 1:10, and turn it for another 30 minutes;

[0023] Tanning: at room temperature, weigh the amphoteric polymer-based nano-composite chrome-less tanning auxiliaries that soften the hide weight by 3.5% after weight gain, and turn it on for 1.0 hour; then weigh the cationic oil that softens the hide weight by 0.5% after weight gain, and turn it on for 0.5 hour ; Then use 1:10 diluted formic acid with water to adjust the pH: 3.7, and then turn for 30 minutes;

[0024] At room temperature, weigh the chrome tanning agent that softens the skin weight by 4% after weight gain, and turn it for 3.0 hours; weigh the sodium forma...

Embodiment 2

[0026] Example 2: The softened skin is weighed, and the weight gain is 50% as the basis of measurement, and the following operations are carried out in the drum;

[0027] Return water: at room temperature, weigh water that softens 70% of the skin weight after weight gain, and turn it for 15 minutes; then use formic acid diluted 1:10 with water, adjust the pH to 6.5, and turn it for another 30 minutes;

[0028] Tanning: at normal temperature, weigh the amphoteric polymer-based nano-composite chrome-less tanning auxiliaries that soften 5% of the skin weight after weight gain; then weigh the cationic oil that softens 0.1% of the skin weight after weight gain, turn for 0.5 hours; turn for 3.0 hours , then adjust the pH to 3.7 with formic acid diluted 1:10 with water, and turn for another 30 minutes;

[0029] At room temperature, weigh the chrome tanning agent that softens the skin weight by 3% after weight gain, and turn it for 1.0 hours; weigh the sodium formate that softens th...

Embodiment 3

[0031] Example 3: The softened skin is weighed, and the weight gain is 50% as the basis of measurement, and the following operations are carried out in the drum;

[0032] Return water: at room temperature, weigh water that softens 70% of the skin weight after weight gain, and turn it for 15 minutes; then use formic acid diluted 1:10 with water, adjust the pH to 6.5, and turn it for another 30 minutes;

[0033] Tanning: at normal temperature, weigh the amphoteric polymer-based nano-composite chrome-less tanning adjuvant that softens 4% of the skin weight after weight gain, and turn it on for 1.0 hour; then weigh the cationic oil that softens the skin weight by 0.5% after weight gain, and turn it for 1.0 hour ; Then use 1:10 diluted formic acid with water to adjust the pH: 3.5, and then turn for 30 minutes;

[0034] At room temperature, weigh the chrome tanning agent that softens the skin weight by 3% after weight gain, and turn it for 2.0 hours; weigh the sodium formate that ...

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Abstract

The invention relates to a salt-free pickling-free less-chrome combination tanning method for first layer cattle shoe upper leather. In a conventional chrome tanning process, the chromic oxide content in liquid waste with 7 percent of tanned chromium powder is 2000-3000 mg / L, harm is caused to the environment and human health, and the tanning cost is increased due to the shortage of chromium resources. According to the method, an amphoteric polymer-based nano composite less-chrome tanning aid is matched with 3-5 percent of chromium powder to be applied to the tanning process of the first layer cattle shoe upper leather, the shrinkage temperature of wet blue is over 95 DEG C, and the chromic oxide content in the tanned liquid waste is 0.21 g / L and is reduced by 80.5 percent compared with the conventional 7 percent of chromium powder tanning. The tensile strength of crust leather is increased by 38.5 percent compared with that of the conventional 7 percent of chromium powder tanning, and the tearing strength is increased by 50.1 percent. The chromic oxide content in the wastewater can be effectively reduced, the amount of chrome tanning agents is reduced, the use of salts and acids in the tanning process is avoided, and the pollution of chrome tanning liquid waste is reduced.

Description

technical field [0001] The invention belongs to the technical field of salt-free and pickling-free tanning of softened cowhide leather, and relates to a salt-free, pickling-free and low-chromium combined tanning method for top-layer cowhide upper leather. technical background [0002] The annual output of leather shoes in my country is about 2.4 billion pairs, accounting for 40% of the total output of leather shoes in the world, among which the top-layer cowhide upper leather accounts for more than 50% of the annual output of leather shoes in my country. At present, the production of top-layer cowhide upper leather in the market is still dominated by the conventional pickling-chrome tanning process. During pickling, a large amount of small molecular acid is required to treat the bare hide, and the direct discharge of pickling waste liquid will lead to acidification of the soil and affect the growth of organisms; at the same time, a large amount of salt will be used during pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22
Inventor 吕斌吕秀娟马建中高党鸽李运聂军凯贾潞
Owner SHAANXI UNIV OF SCI & TECH
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