Tanning method of nano SiO2 or TiO2 tanning agents

A tanning agent and nanotechnology, applied in the field of leather tanning, can solve the problems of not meeting the physical performance requirements at the same time, achieve the effects of shortening the tanning cycle, solving the shortage of chromium resources, and reducing environmental pollution

Inactive Publication Date: 2009-02-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for creation of durable materials with improved properties such as flexibility, brush retention on hair shafts, anti bacteria ability, waterproof fasteners, high stretchiness, low breakdown pressure, long lifespan, etc., without harmful chemical substances like trichromate (TCA). These technical features make them ideal for use in industries that require these qualities including clothing manufacturing, medical applications, military uses, defense purposes, transportations, construction, and others where there are concerns about protective coatings containing potentially carcinogenic compounds called Trimethylamine(Tris) which can be released into our body through contact exposure during normal usage over time.

Problems solved by technology

This patents discusses two technical problem areas related to current chrome tanners - environmental concerns due to potential health hazards associated therewith. One area involves developing an improved chemical called tin oxide, while another focuses towards improving durability without causing harmful side reactions like greenhouse gas emissions from chrome tans. Current alternatives involve complex chemistry techniques involving multiple steps, resulting in increased costs and reduced efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Soaking, dehairing, liming, and softening are carried out in accordance with conventional methods;

[0037] (2) Pre-tanning

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

[0039] (3) Squeeze the water, shave it evenly, and control the moisture content of the crust at 40wt%;

[0040] (4) Nano SiO 2 Main tanning

[0041] Add the above-mentioned pre-tanned, squeezed and shaved skin into the drum, and nano-SiO 2 The tanning agent is 8 kg, the temperature in the drum is controlled at 30°C, and the drum is rotated for 4 hours. After the penetration is complete, 1.5 kg of formic acid with a concentration of 85% by weight and 1.5 kg of sulfuric acid with a concentration of 96% by weight are diluted with 150 kg of water and a...

Embodiment 2

[0047] (1) Soaking, dehairing, liming, and softening are carried out in accordance with conventional methods;

[0048] (2) Pre-tanning

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

[0050] (3) Squeeze the water, shave it evenly, and control the moisture content of the crust at 45% by weight;

[0051] (4) Nano TiO 2 Main tanning

[0052] Add the above-mentioned pre-tanned, squeezed and shaved skin 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, 2 kg of 85% by weight formic acid and 2 kg of 96% by weight sulfuric acid are diluted with 200 kg of water and added to the drum to adjust the tanning liquid The pH value is 2....

Embodiment 3

[0058] (1) Water soaking, dehairing, liming, softening and pickling shall be carried out in accordance with conventional methods;

[0059] (2) Pre-tanning

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

[0061] (3) Squeeze the water, shave it evenly, and control the moisture content of the crust at 40wt%;

[0062] (4) Nano SiO 2 Main tanning

[0063] Add the above-mentioned pre-tanned, squeezed and shaved skin 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, 1 kg of formic acid with a concentration of 85% by weight and 1 kg of sulfuric acid with a concentration of 96% by weight are diluted with ...

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PUM

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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 hand feeling, 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

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Claims

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Application Information

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Owner SICHUAN UNIV
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