Preparation method of chitosan modified graphite oxide functional leather tanning agent

Abstract

The invention relates to a preparation method of a chitosan modified graphite oxide functional leather tanning agent. Currently, the common leather tanning agents are chroming tanning agent, aluminum tanning agent, vegetable tanning agent, aldehyde tanning agent and synthetic tanning agent and the like, but the leather tanning agents can generate pollution problems hard to treat. The preparation method provided by the invention has the following steps of: mixing crystalline flake graphite powder, sodium nitrate and concentrated sulfuric acid and stirring uniformly, slowly adding potassium permanganate for oxygenation, and preparing a suspending liquid through washing, pH adjustment and ultrasonic treatment; and degrading chitosan with high-temperature alpha-amylase so as to obtain a degraded chitosan solution, modifying graphite oxide with the degraded chitosan under a horseradish peroxidase-hydrogen peroxide catalysis system, thus obtaining the chitosan modified graphite oxide functional leather tanning agent. The preparation method provided by the invention has the advantages of unique synthetizing preparation process and good tanning property, is suitable for main tanning and retanning; and the leather has excellent intensity and flexibility after main tanning.

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...

Examples

Embodiment 1

[0031] Step 1: Preparation of graphene oxide suspension:

[0032] 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;

[0033] Step 2: Preparation of degraded chitosan solution:

[0034] 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 ro...

Embodiment 2

[0038] Step 1: Preparation of graphene oxide suspension:

[0039] 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;

[0040] Step 2: Preparation of degraded chitosan solution:

[0041] 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 ...

Embodiment 3

[0045] Step 1: Preparation of graphene oxide suspension:

[0046]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 4 hours; 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;

[0047] Step 2: Preparation of degraded chitosan solution:

[0048] Mix 30 parts by weight of chitosan, 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 digita...

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...

Examples

Embodiment 1

[0031] Step 1: Preparation of graphene oxide suspension:

[0032] 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;

[0033] Step 2: Preparation of degraded chitosan solution:

[0034] 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 ro...

Embodiment 2

[0038] Step 1: Preparation of graphene oxide suspension:

[0039] 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;

[0040] Step 2: Preparation of degraded chitosan solution:

[0041] 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 ...

Embodiment 3

[0045] Step 1: Preparation of graphene oxide suspension:

[0046]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 4 hours; 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;

[0047] Step 2: Preparation of degraded chitosan solution:

[0048] Mix 30 parts by weight of chitosan, 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 digita...

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