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Preparation method of oxidized chitosan/polydopamine composite cross-linking agent

A technology for oxidizing chitosan polydopamine and oxidizing chitosan, which is applied in the field of natural polymer chemistry, can solve the problems of low strength of composite cross-linking agent, environmental impact of by-products, and insufficient performance, and achieves easy storage, The effect of less environmental pollution and excellent product performance

Inactive Publication Date: 2021-09-17
SUZHOU DEHEYAXIN TEXTILE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of traditional composite crosslinking agents is relatively cumbersome and costly, the strength of composite crosslinking agents is relatively low, and the performance is not excellent enough, and some by-products will affect the environment

Method used

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  • Preparation method of oxidized chitosan/polydopamine composite cross-linking agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 Shown, a kind of preparation method of oxidized chitosan polydopamine composite cross-linking agent comprises the steps:

[0035] Step 1, obtaining an alkaline solution of oxidized chitosan: putting the powdered oxidized chitosan into a container, adding an alkaline solvent, stirring to accelerate dissolution, and obtaining an alkaline solution of oxidized chitosan;

[0036] Step 2, mixing and stirring: take the oxidized chitosan alkaline solution obtained in step 1 and inject it into the stirring container, the stirring speed changes according to the gradually added amount of dopamine hydrochloride, and dopamine hydrochloride is added synchronously according to the composite ratio with oxidized chitosan ;

[0037] Step 3, defoaming: Use a vacuum pump to pump air inside the closed stirring container, and observe whether there are bubbles coming out through the observation window on the stirring container that is higher than the liquid level;

[0038] ...

Embodiment 2

[0046] Such as figure 1 Shown, a kind of preparation method of oxidized chitosan polydopamine composite cross-linking agent comprises the steps:

[0047] Step 1. Obtaining an alkaline solution of oxidized chitosan: putting the powdered oxidized chitosan into a container, adding an alkaline solvent, stirring to accelerate dissolution, and obtaining an alkaline solution of oxidized chitosan;

[0048] Step 2, mixing and stirring: take the oxidized chitosan alkaline solution obtained in step 1 and inject it into the stirring container, the stirring speed changes according to the gradually added amount of dopamine hydrochloride, and dopamine hydrochloride is added synchronously according to the composite ratio with oxidized chitosan ;

[0049] Step 3, defoaming: Use a vacuum pump to pump air inside the closed stirring container, and observe whether there are bubbles coming out through the observation window on the stirring container that is higher than the liquid level;

[0050] ...

Embodiment 3

[0060] Such as figure 1 Shown, a kind of preparation method of oxidized chitosan polydopamine composite cross-linking agent comprises the steps:

[0061] Step 1. Obtaining an alkaline solution of oxidized chitosan: putting the powdered oxidized chitosan into a container, adding an alkaline solvent, stirring to accelerate dissolution, and obtaining an alkaline solution of oxidized chitosan;

[0062] Step 2, mixing and stirring: take the oxidized chitosan alkaline solution obtained in step 1 and inject it into the stirring container, the stirring speed changes according to the gradually added amount of dopamine hydrochloride, and dopamine hydrochloride is added synchronously according to the composite ratio with oxidized chitosan ;

[0063] Step 3, defoaming: Use a vacuum pump to pump air inside the closed stirring container, and observe whether there are bubbles coming out through the observation window on the stirring container that is higher than the liquid level;

[0064] ...

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Abstract

The invention discloses a preparation method of an oxidized chitosan / polydopamine composite cross-linking agent, which comprises the following steps: obtaining an oxidized chitosan alkaline solution: putting powdery oxidized chitosan into a container, adding an alkaline solvent, stirring to accelerate dissolution to obtain the oxidized chitosan alkaline solution; and mixing and stirring: injecting the oxidized chitosan alkaline solution obtained in the step 1 into a stirring container, wherein the stirring speed is changed according to the gradual addition amount change of dopamine hydrochloride, and the dopamine hydrochloride is synchronously added according to the compounding ratio of the dopamine hydrochloride and the oxidized chitosan. The composite cross-linking agent is reasonable in structure, the composite cross-linking agent with high strength and high concentration can be obtained, bubbles in fluid are discharged through a vacuum pump, deterioration caused by oxidation of the fluid during storage is reduced, powdery oxidized chitosan is added into an alkaline solvent to obtain an oxidized chitosan alkaline solution, and the effect of preparing while using is achieved; and meanwhile, the powdery oxidized chitosan is easier to store, the environmental pollution is small, and the product performance is excellent.

Description

technical field [0001] The application relates to the technical field of natural polymer chemistry, in particular to a preparation method of an oxidized chitosan-polydopamine composite cross-linking agent. Background technique [0002] Cross-linking agent is a substance that can act as a bridge between linear molecules, so that multiple linear molecules can be bonded and cross-linked to form a network structure. Cross-linking agents have different names in different industries, for example: in It is used to be called "vulcanizing agent" in the rubber industry; "curing agent", "curing agent" and "hardener" in the plastic industry; "curing agent" and "hardener" in the adhesive or coating industry, etc. Although the above titles are different, the chemical properties and mechanisms reflected are the same. [0003] The preparation of traditional composite crosslinking agents is relatively cumbersome and costly, the strength of composite crosslinking agents is relatively low, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08L79/04C08J3/24C08L101/00C08L23/08
CPCC08L5/08C08L79/04C08J3/24C08J2323/08C08J2300/00
Inventor 许云辉
Owner SUZHOU DEHEYAXIN TEXTILE NEW MATERIAL TECH CO LTD