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Preparation method of chitosan modified graphite oxide functional leather tanning agent

A technology of chitosan modification and oxidized stone, which is applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, tanning treatment, etc. It can solve the problems of poor softness, Aluminum tanning agent can solve problems such as flat and thin leather, water pollution, etc., and achieve good social and economic benefits, excellent strength and flexibility, and good filling effect

Active Publication Date: 2014-07-02
JIANGSU BESCON PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chrome tanning agent is the tanning agent with the best tanning effect at present, but it will produce pollution problems that are difficult to control; aluminum tanning agent has a flat and thin leather with low strength; Restricted; Synthetic tanning agents are mostly aldehyde-containing tanning agents or acrylic resin retanning agents. Although the finished leather with aldehyde-containing tanning agents is soft and fine-grained, the leather is flat and thin, and it is prone to yellowing after prolonged storage, and it will also produce moisture. Pollution and environmental pollution; acrylic resin retanning agent has good selective filling, which can increase the thickness and fullness of leather, but because of its high polymer glass transition temperature, it makes the finished leather body hard and grain rough

Method used

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  • Preparation method of chitosan modified graphite oxide functional leather tanning agent
  • Preparation method of chitosan modified graphite oxide functional leather tanning agent
  • Preparation method of chitosan modified graphite oxide functional leather tanning agent

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Mix and stir 10 parts by weight of graphite powder, 2 parts by weight of sodium nitrate and 80 parts by weight of concentrated sulfuric acid and slowly add 19 parts by weight of potassium permanganate. The temperature of this process is 5°C; then heat up to 45°C for water bath reaction 60min, after gradually adding 360 parts by weight of deionized water, the temperature was raised to 58°C to continue the reaction for 4h; then 24 parts by weight of hydrogen peroxide solution with a mass fraction of 30% was added dropwise, washed 5 times to make 1000 parts by weight of Suspension, after ultrasonic treatment for 30min, set aside;

[0032] Step 2: Preparation of degraded chitosan solution:

[0033] Mix 20 parts by weight of chitosan with 100 parts of deionized water and 0.1 part of high-temperature α-amylase in the reactor and heat it to 80°C for degradation, and measure its viscosity at 80°C with NDJ-5S digital rotational viscometer After about 5.5mpa??s, cool down to roo...

Embodiment 2

[0038] Mix and stir 10 parts by weight of graphite powder, 2 parts by weight of sodium nitrate and 80 parts by weight of concentrated sulfuric acid and slowly add 19 parts by weight of potassium permanganate. The temperature of this process is 15°C; then heat up to 45°C for water bath reaction 60min, after gradually adding 360 parts by weight of deionized water, the temperature was raised to 58°C to continue the reaction for 4h; then 24 parts by weight of hydrogen peroxide solution with a mass fraction of 30% was added dropwise, washed 5 times to make 1000 parts by weight of Suspension, after ultrasonic treatment for 30min, set aside;

[0039] Step 2: Preparation of degraded chitosan solution:

[0040] Mix 25 parts by weight of chitosan, 125 parts of deionized water, and 0.3 parts of high-temperature α-amylase in a reactor and heat it to 90°C for degradation, and measure its viscosity with a NDJ-5S digital rotational viscometer at 80°C After about 5.5mpa??s, cool down to room...

Embodiment 3

[0045]Mix and stir 10 parts by weight of graphite powder, 2 parts by weight of sodium nitrate and 80 parts by weight of concentrated sulfuric acid and slowly add 19 parts by weight of potassium permanganate. The temperature of this process is 25°C; then heat up to 45°C for water bath reaction 60min, after gradually adding 360 parts by weight of deionized water, the temperature was raised to 58°C to continue the reaction for 4h; then 24 parts by weight of hydrogen peroxide solution with a mass fraction of 30% was added dropwise, washed 5 times to make 1000 parts by weight of Suspension, after ultrasonic treatment for 30min, set aside;

[0046] Step 2: Preparation of degraded chitosan solution:

[0047] Mix 30 parts by weight of chitosan with 150 parts of deionized water and 0.3 parts of high-temperature α-amylase in a reactor and heat it to 85°C for degradation, and measure its viscosity at 80°C with an NDJ-5S digital rotational viscometer After about 5.5mpa??s, cool down to r...

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Abstract

The invention relates to a preparation method of a chitosan-modified graphene oxide functional leather tanning agent. At present, commonly used leather tanning agents include chrome tanning agents, aluminum tanning agents, vegetable tanning agents, aldehyde tanning agents and synthetic tanning agents, etc., but they will produce pollution problems that are difficult to control. In the present invention, flake graphite powder, sodium nitrate and concentrated sulfuric acid are mixed and stirred uniformly, potassium permanganate is slowly added for oxidation, and a suspension is prepared after washing, pH adjustment and ultrasonic treatment; Degraded chitosan solution is obtained by degrading; then the graphene oxide is modified with the degraded chitosan under the catalytic system of horseradish peroxidase and hydrogen peroxide to obtain chitosan-modified graphene oxide functional leather tanning agent. The preparation method of the invention has a unique synthetic preparation process, good tanning performance, is suitable for main tanning and retanning, and the leather after main tanning has excellent strength and flexibility.

Description

technical field [0001] The patent of the invention relates to a preparation method of a leather tanning agent, in particular to a preparation method of a chitosan-modified graphene oxide functional leather tanning agent. Background technique [0002] Leather tanning agents are one of the most important chemicals in the leather industry. Commonly used tanning agents include chrome tanning agents, aluminum tanning agents, vegetable tanning agents, aldehyde tanning agents and synthetic tanning agents. Chrome tanning agent is the tanning agent with the best tanning effect at present, but it will produce pollution problems that are difficult to control; aluminum tanning agent has a flat and thin leather with low strength; Restricted; Synthetic tanning agents are mostly aldehyde-containing tanning agents or acrylic resin retanning agents. Although the finished leather with aldehyde-containing tanning agents is soft and fine-grained, the leather is flat and thin, and it is prone t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/22
Inventor 吕生华崔亚亚马宇娟曹强
Owner JIANGSU BESCON PHARMA
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