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Leather tanning agent based on cellulose and nanometer SiO2 hybridization and preparation method

A cellulose, dialdehyde cellulose technology, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, tanning treatment, etc., can solve the shrinkage of vegetable tanned leather Low temperature, unsuitable production of soft leather, environmental pollution and other problems, to improve the washing resistance, avoid surface over-tanning phenomenon, avoid the effect of rough surface phenomenon

Inactive Publication Date: 2017-01-04
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shrinkage temperature of vegetable tanned leather is low, the color is heavy, and it is not suitable for the production of soft leather; the third category is organic tanning agents similar to aldehyde tanning mechanisms, such as glutaraldehyde, oxazolidine, tetrakis phosphonium sulfate, etc. However, this type of tanning agent itself still has certain toxicity, which is easy to cause environmental pollution problems.
Therefore, above-mentioned tanning agent does not obtain large-scale practical application in leather industry

Method used

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  • Leather tanning agent based on cellulose and nanometer SiO2 hybridization and preparation method
  • Leather tanning agent based on cellulose and nanometer SiO2 hybridization and preparation method
  • Leather tanning agent based on cellulose and nanometer SiO2 hybridization and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 5 g of cellulose and dissolve it in 100 mL of hydrochloric acid solution with a concentration of 5 mol / L, stir, hydrolyze for 12 hours, centrifuge and take the precipitate. The precipitated substance is washed and soaked with deionized water, and the precipitate is suspended in deionized water; sodium periodate is added to the solution under stirring until the precipitated substance is evenly dispersed. The reaction was carried out in a light-proof environment, and the pH value of the solution was kept at 4 during the process, and the temperature was 40°C. After the reaction, add tert-butanol to the solution, and centrifuge to obtain dialdehyde cellulose.

[0029] (2) Add 10mL tetraethylsiloxane to 50mL ethanol-water solution, mix well, then add 0.5mL glacial acetic acid, heat up to 75°C, after 15 minutes, add N-aminoethyl-γ-aminopropanol dropwise Trimethoxysilane until a gel appears. The gel was vacuum dried to obtain SiO 2 -NH 2 .

[0030] (3) The diald...

Embodiment 2

[0033] (1) Weigh 5 g of cellulose and dissolve it in 100 mL of hydrochloric acid solution with a concentration of 5 mol / L, stir, hydrolyze for 12 hours, centrifuge and take the precipitate. The precipitated substance is washed and soaked with deionized water, and the precipitate is suspended in deionized water; sodium periodate is added to the solution under stirring until the precipitated substance is evenly dispersed. The reaction was carried out in a dark environment, and the pH value of the solution was kept at 3 during the process, and the temperature was 35°C. After the reaction, add tert-butanol to the solution, and centrifuge to obtain dialdehyde cellulose.

[0034] (2) Add 10mL butyl orthosilicate to 50mL ethanol-water solution, mix well, then add 0.5mL glacial acetic acid, heat up to 70°C, after 20 minutes, add N-aminoethyl-γ-aminopropyl dropwise trimethoxysilane until a gel appears. The gel was vacuum dried to obtain SiO 2 -NH 2 .

[0035] (3) The dialdehyde ce...

Embodiment 3

[0038] (1) Weigh 5 g of cellulose and dissolve it in 100 mL of hydrochloric acid solution with a concentration of 5 mol / L, stir, hydrolyze for 12 hours, centrifuge and take the precipitate. The precipitated substance is washed and soaked with deionized water, and the precipitate is suspended in deionized water; sodium periodate is added to the solution under stirring until the precipitated substance is evenly dispersed. The reaction was carried out in a dark environment, the pH value of the solution was kept at 5, and the temperature was 50°C during the process. After the reaction, add tert-butanol to the solution, and centrifuge to obtain dialdehyde cellulose.

[0039] (2) Add 10mL of butyl orthosilicate to 50mL of ethanol-water solution, mix well, then add 0.5mL of glacial acetic acid, heat up to 80°C, after 10 minutes, add N-aminoethyl-γ-aminopropyl dropwise trimethoxysilane until a gel appears. The gel was vacuum dried to obtain SiO 2 -NH 2 .

[0040] (3) The dialdehy...

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Abstract

The invention relates to a leather tanning agent based on cellulose and nanometer SiO2 hybridization and a preparation method of a compound. The compound is obtained by dialdehyde cellulose and SiO2-NH2 through a Schiff's Base reaction; and the weight ratio of the dialdehyde cellulose to nanometer SiO2 particles is 2.0-4.0. The leather tanning agent is a clean, environment-friendly and ecological leather tanning agent product, and eliminates pollution of a chromium tanning agent. Meanwhile, a synergistic effect of modified cellulose and nanometer SiO2 can enhance the rigidity of a modified cellulose tanning unit and improve the water washing resistance of the nanometer SiO2 to finally raise the shrinkage temperature; and the surface over-tanning phenomenon caused by single use of the modified cellulose can be prevented, and the rough surface phenomenon caused by agglomeration by single use of nanometer SiO2 can be prevented, so that the crust leather grain surface is delicate.

Description

technical field [0001] The invention relates to the technical field of leather chemicals and their preparation, in particular to a leather tanning agent and a preparation method. Background technique [0002] Tanning with chrome tanning agents has long been the mainstream technique for leather tanning in the modern tanning industry. In the traditional tanning process, a large amount of chemical materials such as acids, alkalis, salts, tanning agents, and dyes are used. The use of these materials leads to a relatively high level of chromium and ammonia nitrogen in the tanning waste liquid; and, in Toxic gases such as ammonia and hydrogen sulfide are also emitted during the tanning process. The discharge of waste liquid, waste residue and waste gas all threaten the health of tannery workers and the surrounding environment to varying degrees. At the same time, the utilization rate of chromium salt in the traditional chrome tanning method is only 65%-75%. This low absorption r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08
CPCC14C3/08
Inventor 张敏陈礼辉黄六莲
Owner FUJIAN AGRI & FORESTRY UNIV
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