Tanning method by using improved-structure chromium-free retanning agent

A chrome-free retanning and structure-improving technology, which can be used in small hide/big hide/leather/fur treatment, small hide/big hide/leather/fur chemical treatment, tanning treatment, etc. It can solve the lack of softness and fullness , little environmental pollution, impact on biochemical treatment and other issues, to achieve the effect of preventing abnormal leather color, strong buffering capacity, and easing effect

Inactive Publication Date: 2015-04-29
海宁瑞星皮革有限公司
View PDF7 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of aldehyde tanning agents mainly uses aldehydes and their modified products, which has little environmental pollution and can be salt-free and non-pickling, but there are shortcomings such as coarse grain, scale, and free formaldehyde; and synthetic tanning Although the shrinkage temperature of the tanning agent is high, it lacks softness and fullness, and the style of the leather is limited. The high content of aldehyde in the wastewater affects the biochemical treatment, and the matching between the two and the chrome tanning process is slightly poor, and the development of supporting materials needs to be strengthened; The shrinkage temperature of leather treated with non-chrome metal compound tanning agent is relatively high, and it has a good match with a complete set of tanning process and materials based on the chrome tanning method. The disadvantage is that the precipitation point of the tanning agent is low

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

[0023] Put the chrome-tanned shaved leather into the drum, and then take the weight of the chrome-tanned shaved leather as the basis for the ingredients of the following ingredients, add 150wt% water of the weight of the chrome-tanned shaved leather, which is equivalent to the weight of the chrome-tanned shaved leather (g) The weight ratio (g) to water is 1:1.5, then adjust the temperature to 25°C, add 1.5% polymerization inhibitor, and rotate for 15 minutes; then add sulfuric acid to adjust the pH of the bath solution to ≤3.5, and rotate for 60 minutes; then add The auxiliary tanning tannin of chrome-tanned shaved leather weight 1.0wt%, then, after rotating 120min, add the non-chromium metal complex tanning of chrome-tanned shaved leather weight 4.0wt%, described non-chromium metal complex tanning agent is Zirconium tanning agent, aluminum tanning agent and titanium tanning agent composite multi-metal complex tanning agent, rotate 180min; Finally, add the composite alkali-rais...

Embodiment 2

[0025]Put the chrome-tanned shaved leather into the drum, and then take the weight of the chrome-tanned shaved leather as the basis for the ingredients of the following ingredients, add 100wt% water of the weight of the chrome-tanned shaved leather, which is equivalent to the weight of the chrome-tanned shaved leather (g) The weight ratio (g) to water is 1:1, then adjust the temperature to 30°C, add 2.0% polymerization inhibitor, and rotate for 10 minutes; then add sulfuric acid to adjust the pH of the bath solution to ≤3.5, and rotate for 90 minutes; then add The auxiliary tanning tannin of chrome shaved leather weight 2.0wt%, then, after rotating for 90min, add the non-chromium metal complex tanning of chrome tanned shaved leather weight 3.5wt%, described non-chromium metal complex tanning agent is Zirconium tanning agent, aluminum tanning agent and titanium tanning agent composite multi-metal complex tanning agent, rotate 210min; Finally, add the compound alkali-raising agen...

Embodiment 3

[0027] Put the chrome-tanned shaved leather into the drum, and then take the weight of the chrome-tanned shaved leather as the basis for the ingredients of the following ingredients, add 120wt% of the water of the chrome-tanned shaved leather, which is equivalent to the weight of the chrome-tanned shaved leather (g) The weight ratio (g) to water is 1:1.2, then adjust the temperature to 28°C, add 1.8% polymerization inhibitor, and rotate for 15 minutes; then add sulfuric acid to adjust the pH of the bath solution to ≤ 3.5, and rotate for 80 minutes; then add The auxiliary tanning tannin of chrome-tanned shaved leather weight 1.5wt%, then, after rotating 100min, add the non-chromium metal complex tanning of chrome-tanned shaved leather weight 3.8wt%, described non-chromium metal compound tanning agent is Zirconium tanning agent, aluminum tanning agent and titanium tanning agent composite multi-metal complex tanning agent, the mass percent of zirconium tanning agent in the describ...

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 relates to a tanning method by using an improved-structure chromium-free retanning agent, belonging to the technical field of leather treatment. In order to overcome the defects of severe chromium pollution, low shrinkage temperature and low setting point in the retanning process, the invention provides a tanning method by using an improved-structure chromium-free retanning agent. The method comprises the following steps: adding shaving leather into a rotating drum, adding 100-150 wt% of water, regulating the temperature to 25-30 DEG C, adding 1.5-2.0 wt% of coordination polymerization inhibitor, and rotating for 10-30 minutes; regulating the pH value of the bath to at most 3.5, and rotating for 60-90 minutes; adding 1.0-2.0 wt% of tanning-assisting tannin, and rotating for 90-120 minutes; adding a non-chromium metal composite tanning agent and 0.2-0.4 wt% of alkali extractor to perform alkali extraction; and heating to 38-40 DEG C to perform treatment, and carrying out after-treatment to obtain the finished leather product. The tanning agent has the advantages of high setting point and high shrinkage temperature; and the method effectively controls the total chromium content in the wastewater and sludge.

Description

technical field [0001] The invention relates to a chrome-free retanning agent leather-making method with an improved structure, belonging to the technical field of leather treatment. Background technique [0002] In the modern leather industry, chrome tanning agent is a kind of metal salt tanning agent with the most outstanding application performance, which is widely used and occupies a dominant position in the leather industry. However, as we all know, chromium is a heavy metal that will cause environmental pollution. It is difficult to degrade by general biochemical methods and usually accumulates in the environment. Long-term uncontrolled discharge will cause water pollution, affect the growth of aquatic organisms and microorganisms, and destroy the ecological balance. , which is not conducive to self-purification of water bodies; moreover, although trivalent chromium is used for leather tanning, there is a potential danger of generating highly toxic hexavalent chromium ...

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 Applications(China)
IPC IPC(8): C14C3/04C14C3/12
CPCC14C3/04C14C3/12
Inventor 阮道光
Owner 海宁瑞星皮革有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap