Nanometer silicon dioxide-coated quaternary ammonium salt chitosan composite antibacterial agent and preparation method thereof

A technology of quaternary ammonium salt chitosan and nano-silica, applied in the directions of botanical equipment and methods, biocides, disinfectants, etc., can solve the problems of difficulty in adding, insufficient thermal performance, limitation of antibacterial applications, etc.

Active Publication Date: 2020-10-30
LIMING VOCATIONAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an organic polymer material, quaternary ammonium chitosan itself has insufficient thermal properties and is difficult to add to plastic substrates, and its antibacterial application is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw material ratio (parts by weight) of the nano-silica coated quaternary ammonium chitosan composite antibacterial agent of the present embodiment is as follows: 1 part of quaternary ammonium chitosan aqueous solution, 1 part of liquid paraffin, Span-80 emulsification 0.3 parts of agent, 5 parts of polyvinyl alcohol aqueous solution, and 5 parts of tetraethyl orthosilicate solution. Among them, the degree of substitution of quaternary ammonium chitosan is 50-90%, the relative molecular mass is 100,000-800,000, and the solid content of the quaternary ammonium chitosan solution is 2%; The solid content of the vinyl alcohol aqueous solution is 3%; the ratio by weight of tetraethyl orthosilicate, ethanol and deionized water in the tetraethyl orthosilicate solution is 3:10:10.

[0027] The nano silicon dioxide coated quaternary ammonium chitosan composite antibacterial agent of the present embodiment is prepared according to the following steps:

[0028] Step 1. Disper...

Embodiment 2

[0038] The raw material ratio (parts by weight) of the nano-silica coated quaternary ammonium chitosan composite antibacterial agent of the present embodiment is as follows: 1 part of quaternary ammonium chitosan aqueous solution, 2 parts of liquid paraffin, emulsified by Span-60 0.3 parts of agent, 5 parts of polyvinyl alcohol aqueous solution, and 5 parts of tetraethyl orthosilicate solution. Among them, the degree of substitution of quaternary ammonium chitosan is 50-90%, the relative molecular mass is 100,000-800,000, and the solid content of the quaternary ammonium chitosan solution is 5%; the relative molecular mass of polyvinyl alcohol is 100,000, and the polyvinyl alcohol The solid content of the vinyl alcohol aqueous solution is 5%; the ratio by weight of tetraethyl orthosilicate, ethanol and deionized water in the tetraethyl orthosilicate solution is 3:10:10.

[0039] The nano silicon dioxide coated quaternary ammonium chitosan composite antibacterial agent of the pr...

Embodiment 3

[0050] The raw material ratio (parts by weight) of the nano-silica coated quaternary ammonium chitosan composite antibacterial agent of the present embodiment is as follows: 1 part of quaternary ammonium chitosan aqueous solution, 2 parts of liquid paraffin, Span-80 emulsification 0.6 parts of agent, 10 parts of polyvinyl alcohol aqueous solution, and 8 parts of tetraethyl orthosilicate solution. Among them, the degree of substitution of quaternary ammonium chitosan is 50-90%, the relative molecular mass is 100,000-800,000, and the solid content of the quaternary ammonium chitosan solution is 10%; The solid content of the vinyl alcohol aqueous solution is 6%; the ratio by weight of tetraethyl orthosilicate, ethanol and deionized water in the tetraethyl orthosilicate solution is 3:10:10.

[0051] The nano silicon dioxide coated quaternary ammonium chitosan composite antibacterial agent of the present embodiment is prepared according to the following steps:

[0052] Step 1. Dis...

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PUM

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Abstract

The invention discloses a nanometer silicon dioxide-coated quaternary ammonium salt chitosan composite antibacterial agent and a preparation method thereof. The antibacterial agent comprises the following components in parts by weight: 1-3 parts of an aqueous quaternary ammonium salt chitosan solution, 1-4 parts of liquid paraffin, 0.1-1.0 part of an emulsifier, 5-15 parts of an aqueous polyvinylalcohol solution and 5-15 parts of a tetraethyl orthosilicate solution. The preparation method comprises the following steps: adding the aqueous quaternary ammonium salt chitosan solution into the liquid paraffin dissolved with the emulsifier, and carrying out mixing to form a water-in-oil emulsion; transferring the emulsion into the aqueous polyvinyl alcohol solution and conducting mixing to forma water / oil / water emulsion; then adding the tetraethyl orthosilicate solution, carrying out uniform mixing, dropwise adding a certain amount of an alkaline solution, separating out silicon dioxide toform gel, allowing the gel to be precipitated and attached to quaternary ammonium salt chitosan, and carrying out crushing, washing and drying to obtain the nanometer silicon dioxide-coated quaternary ammonium salt chitosan composite antibacterial agent. The antibacterial agent has good antibacterial performance and thermal performance.

Description

technical field [0001] The invention relates to a composite antibacterial agent, in particular to a nano silicon dioxide-coated quaternary ammonium chitosan composite antibacterial agent and a preparation method thereof. Background technique [0002] Quaternary ammonium chitosan is a derivative of chitosan modified by quaternary ammonium salt. Compared with chitosan, its water solubility is greatly improved. With the increase of substitution degree, it can swell even in neutral water environment. Dissolved, the quaternary ammonium salt group in the molecule can exert antibacterial effect. However, quaternary ammonium chitosan, as an organic polymer material, has insufficient thermal properties and is difficult to add to plastic substrates, and its antibacterial application is limited. Contents of the invention [0003] The invention provides a method for preparing a nano-silica-coated quaternary ammonium chitosan composite antibacterial agent. Through the construction of ...

Claims

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Application Information

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IPC IPC(8): A01N25/08A01N25/22A01N43/16A01P1/00C08L29/04C08L5/08C08L91/06C08K3/36
CPCA01N25/08A01N25/22A01N43/16C08L29/04C08K2201/011C08L2205/03C08L5/08C08L91/06C08K3/36
Inventor曾安蓉林鸿裕汪扬涛曾安然
OwnerLIMING VOCATIONAL UNIV