Chitosan-quaternary-ammonium-salt antibacterial agent and antibacterial liquid, preparing technology of chitosan-quaternary-ammonium-salt antibacterial agent and preparing technology of chitosan-quaternary-ammonium-salt antibacterial liquid

Abstract

The invention discloses a preparing technology of a chitosan-quaternary-ammonium-salt antibacterial agent. The preparing technology includes the following steps that chitosan and epoxypropyltrimethylammonium chloride are prepared into chitosan quaternary ammonium salt with the substitution degree, then the chitosan quaternary ammonium salt is reacted with isocyanate closed by methyl ethyl ketoxime, and the reactive chitosan-quaternary-ammonium-salt antibacterial agent can be obtained. The invention discloses the chitosan-quaternary-ammonium-salt antibacterial agent, chitosan-quaternary-ammonium-salt antibacterial liquid and the preparing technology of the chitosan-quaternary-ammonium-salt antibacterial agent and a preparing technology of the chitosan-quaternary-ammonium-salt antibacterial liquid. Synthesized quaternary ammonium salt modified chitosan is adopted, and single-closed isocyanate is introduced on the chitosan. The antibacterial performance of the reactive quaternary-ammonium-salt chitosan is good and is far higher than that of the chitosan; the chitosan is introduced into an isocyanate reaction group, and the good reactivity is achieved; the crystallinity of the quaternary-ammonium-salt chitosan is reduced, the isocyanate can be evenly reacted with fabric, the crosslinking effect is good, and the antibacterial performance can be remarkably improved.

Description

technical field [0001] The invention relates to a chitosan antibacterial substance, in particular to a chitosan quaternary ammonium salt antibacterial substance. Background technique [0002] Chitosan is the product of deacetylation of chitin, and it is the most basic and important derivative of chitin. Chitin, also known as chitin and chitin, is chemically named (1,4)-2-acetamide-2-deoxy-β-D-glucan, and is mainly found in the shells of shrimp, crabs, pupae and insects. And in the cell walls of fungi and algae. The dry shell of arthropods contains about 20-50% chitin. There are three structures of chitin in nature: α, β, γ, among which the most common and common is the α type. The annual biosynthesis of chitin on the earth is billions of tons, and it is a natural polymer compound whose output is second only to cellulose. The structures of chitin and chitosan are as follows: [0003] [0004] In the pharmaceutical industry, surgical sutures made of chitosan have good ...

AI Technical Summary

Problems solved by technology

Wang Xiaohua prepared an antibacterial finishing agent by degrading chitosan and reacting with isocyanate, but the author claimed that chitosan and isocyanate could not react homogeneously, and the synthesis failed

[0006] The current research issues are: 1. Chitosan has general antibacterial properties, and its antibacterial properties need to be improved

2. The polarity difference between chitosan and isocyanate is large, and they cannot be uniformly dispersed with each other, resulting in the agglomeration of the crosslinking agent. The crosslinking performance is general. 3. Chitosan has strong crystallinity. On the interface between the dispersed phase of polysaccharide and the dispersed phase of cross-linking agent, it cannot be deeply immobilized

Images