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Tanning method of nano SiO2 or TiO2 tanning agents

A nano-tanning agent technology, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, tanning treatment, etc., can solve the problem of not meeting the physical performance requirements at the same time, etc. problems, to achieve the effect of shortening the tanning cycle, reducing environmental pollution, soft, plump and elastic

Inactive Publication Date: 2012-07-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Ts of the finished leather obtained by using this kind of tanning agent alone is very low, generally not exceeding 85°C, and cannot meet different physical property requirements at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Water immersion, depilation, liming, softening are carried out according to conventional methods;

[0037] (2) Pre-tanned

[0038] Add 100 kilograms of water in the drum, 100 kilograms of sheepskin softening skin blanks, 2 kilograms of oxazolidine tanning agents, control the temperature in the drum at 30 ° C for 2 hours, then add 2 kilograms of formic acid with a concentration of 85 wt%, and adjust the pH of the solution to 4.0, rotate for 1 hour,;

[0039] (3) Squeeze water, cut evenly, and control the moisture content of the skin to 40wt%;

[0040] (4) Nano SiO 2 main tanning

[0041] Add the above-mentioned pre-tanned, water-squeezed, and shaved hides into the drum, and nano-SiO 2 8 kg of tanning agent, control the temperature in the drum at 30°C, and rotate for 4 hours. After the penetration is complete, dilute 1.5 kg of 85 wt% formic acid and 1.5 kg of 96 wt% sulfuric acid with 150 kg of water and add them to the drum to adjust the tanning agent. The pH va...

Embodiment 2

[0047] (1) Water immersion, depilation, liming, softening are carried out according to conventional methods;

[0048] (2) Pre-tanning

[0049] Add 100 kilograms of water in the drum, 100 kilograms of softened pigskin skin, 5 kilograms of modified glutaraldehyde tanning agent, control the temperature in the drum at 33 ° C for 1 hour, then add 1.5 kilograms of formic acid with a concentration of 85 wt % to adjust the solution The pH value is 4.2, rotate for 2 hours;

[0050] (3) Squeeze water, cut evenly, and control the moisture content of the skin to 45wt%;

[0051] (4) Nano-TiO 2 main tanning

[0052] Add the above-mentioned pre-tanned, water-squeezed, and shaved hides into the drum, and nano-TiO 2 7 kg of tanning agent, control the temperature in the drum at 30°C, and rotate for 5 hours. After the penetration is complete, dilute 2 kg of 85 wt% formic acid and 2 kg of 96 wt% sulfuric acid with 200 kg of water and add them to the drum to adjust the tanning solution When t...

Embodiment 3

[0058] (1) Soaking in water, depilation, liming, softening, and pickling are carried out according to conventional methods;

[0059] (2) Pre-tanning

[0060] Add 150 kg of pickling solution to the drum, 100 kg of rabbit skin pickled skin, add 1 kg of baking soda, 1.5 kg of baking soda, adjust the pH value of the solution to 4.0, rotate for 30 minutes; drain; wash 2 times, drain ; Add 10 kg of white extract, and rotate for 2 hours;

[0061] (3) Squeeze water, cut evenly, and control the moisture content of the skin to 40wt%;

[0062] (4) Nano SiO 2 main tanning

[0063] Add the above-mentioned pre-tanned, water-squeezed, and shaved hides into the drum, and nano-SiO 2 6 kg of tanning agent, control the temperature in the drum at 30°C, and rotate for 4 hours. After the penetration is complete, dilute 1 kg of 85 wt% formic acid and 1 kg of 96 wt% sulfuric acid with 100 kg of water and add to the drum to adjust the tanning solution When the pH value is 3.0, raise the temperatu...

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Abstract

The invention relates to a tanning method of a nanometer SiO2 or TiO2 tanning agent, which has the characteristics that bating leather blank or pickled leather blank is pretanned by a pretanning agent and mainly tanned by the nanometer SiO2 or nanometer TiO2 tanning agent or pretanned by other retanning agents, the leather blank of pig, ox, lamb, etc. is mainly tanned by the nanometer tanning agent or retanned by other tanning agents, the shrinking temperature of the resultant leather is higher than 95 DEG C, the appearance color is subalbous, the grain surface is flat and fine with soft handfeeling, fullness and elasticity, and all the physical mechanical indexes reach the industrial standards of free-chrome tanning leather. The finished leather has good bacteriostasis property, anti-mold property, air permeability, moisture permeability, anti-ultraviolet ageing performance and storage stability. The invention replaces the traditional chrome tanning with nanometer tanning, solves the problems of poor chrome resources and the pollution of trivalent chromium and hexavalent chrome to the human being and the environment, and develops a new path for tanning leather with the free-chrome tanning agents.

Description

technical field [0001] The present invention relates to a kind of nano SiO 2 or TiO 2 A leather tanning method of a tanning agent belongs to the field of leather tanning. technical background [0002] Chrome tanning is the leading tanning method in the leather industry today. Chrome tanned leather has many advantages that other tanned products cannot match, but chromium salt resources are scarce, and the toxicity of heavy metal chromium, especially hexavalent chromium, is carcinogenic to the human body. , causing serious pollution to the environment. Under such circumstances, the traditional chrome tanning method has faced enormous pressure and challenges, and the development of new technologies and processes for chrome-free tanning of leather has become one of the most urgent major problems to be solved in the current leather industry. [0003] The currently developed chrome-free tanning agents include non-chrome metal tanning agents and organic tanning agents. Metal ta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/02C14C3/04
Inventor 范浩军芦燕刘源森罗朝阳周虎陈意石欢欢石碧
Owner SICHUAN UNIV
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