Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A salt-free, pickling-free, low-chromium combined tanning method for top-layer cowhide shoe upper leather

A top-layer cowhide combined with tanning technology, which is applied in the field of salt-free and pickling-free tanning of softened cowhide leather, to achieve the effects of reducing pollution, avoiding the use of salt, and reducing the content of salt

Inactive Publication Date: 2016-05-18
SHAANXI UNIV OF SCI & TECH
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: soften skin weighing, gain weight 50% as metering basis, carry out following operation in 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 formate that softens the skin weight by 0.3% after ...

Embodiment 2

[0026] Embodiment 2: soften skin weighing, gain weight 50% as metering basis, carry out following operation in 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 the skin weight by 0.5% after weight gain, and tu...

Embodiment 3

[0031] Embodiment 3: soften skin weighing, gain weight 50% as metering basis, carry out following operation in 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 softens the skin weight by 0.7% after weight ga...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to a salt-free, pickling-free, low-chromium combined tanning method for top-layer cowhide upper leather. In the conventional chrome tanning process, the content of chromium trioxide in the waste liquid after tanning with 7% chrome powder is 2000-3000mg / L, which will cause harm to the environment and human health. At the same time, the shortage of chromium resources will also lead to tanning costs. increase. In the present invention, the amphoteric polymer-based nano-composite chrome-less tanning auxiliaries and 3%-5% chrome powder are applied to the tanning process of the top-layer cowhide shoe upper leather. The content of chromium oxide is 0.21g / L, which is 80.5% lower than that tanned with 7% conventional chrome powder; the tensile strength of crust leather is 38.5% higher than that of 7% conventional chrome powder tanned, and the tear strength is increased by 50.1%. The invention can effectively reduce the content of chromium trioxide in waste water, reduce the dosage of chrome tanning agent, avoid the use of salt and acid in the tanning process, and reduce the pollution of chrome tanning waste liquid.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com