Chitosan quaternary ammonium salt antibacterial fiber, fabric and hygienic product and their preparation processes

Abstract

The invention discloses a preparation process of chitosan quaternary ammonium salt antibacterial fiber, comprising: preparing chitosan and epoxypropyltrimethyl ammonium chloride into a chitosan quaternary ammonium salt with certain degree of substitution, reacting methyl ethyl ketoxime terminated isocyanate with the chitosan quaternary ammonium salt to obtain a reactive chitosan quaternary ammonium salt antibacterial agent or chitosan quaternary ammonium salt antibacterial liquid; dissolving the chitosan quaternary ammonium salt antibacterial agent or chitosan quaternary ammonium salt antibacterial liquid in water, and soaking the obtained fiber. The invention also discloses a chitosan quaternary ammonium salt antibacterial fabric and hygienic product and their preparation processes. Quaternary ammonium salt modified chitosan is synthesized herein, single-terminated isocyanate is introduced to the chitosan, the reactive quaternary ammonium salt chitosan has good antibacterial property far better than that of chitosan; by inoculating chitosan to isocyanate reaction groups, good reactiveness is provided; crystallinity of chitosan is decreased through quaternary ammonium salt salifying, it is possible for the isocyanate to react evenly with the fabric, the crosslinking effect is good, the antibacterial property of the fabric can be significantly improved, and the fabric has a promising application prospect.

Description

technical field [0001] The invention relates to a chitosan antibacterial substance, in particular to the specific application of 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...

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

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