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A chitosan-loaded nano-titanium dioxide composite and its preparation method

A technology of nano-titanium dioxide and chitosan, which is applied in textiles, papermaking, and fiber treatment, can solve the problems of poor antibacterial durability, low safety, and delayed antibacterial effect, and achieve mild reaction conditions, wide application range, and good sustained release performance effect

Active Publication Date: 2017-01-04
科凯精细化工(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All these antibacterial agents have defects in varying degrees during use: the cost of inorganic antibacterial agents is high, and the antibacterial effect is slow; organic antibacterial agents are often irritating to the skin, have low safety, and poor antibacterial durability; natural antibacterial agents The broad-spectrum of the agent is poor, and it is unstable to light, heat and chemicals, so people urgently need to develop new technologies and new methods to solve these problems
However, electron-hole pairs are easy to recombine, which affects its catalytic activity, and it must be irradiated with ultraviolet light, which limits the application range of titanium dioxide.

Method used

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  • A chitosan-loaded nano-titanium dioxide composite and its preparation method
  • A chitosan-loaded nano-titanium dioxide composite and its preparation method
  • A chitosan-loaded nano-titanium dioxide composite and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: adopt acetic acid solution to fully dissolve chitosan, be mixed with the chitosan solution that mass percentage is 0.5%, get 15mL above-mentioned chitosan solution and 0.0365g nanometer TiO 2 Placed in a beaker, sonicated to make nano-TiO 2 Uniformly disperse in the chitosan solution, then add 0.15mL Tween80 to obtain the pre-emulsified aqueous phase mixture; add 100mL petroleum ether, 50mL liquid paraffin and 7.5mL emulsifier Span80 to the three-necked flask, stir well, it is oil phase mixture. Add the pre-emulsified water phase mixture to the oil phase mixture evenly and slowly by spraying, control the reaction temperature at 30°C, stir for 0.5h, add 0.1mL glutaraldehyde, continue stirring for 4h, let stand, suction filter, wash, Dry to obtain chitosan-loaded nano-TiO 2 Antibacterial microspheres, the electron micrographs of which are shown in figure 1 as shown, figure 1 The scale bar in is 200 μm.

Embodiment 2

[0026] Use acetic acid solution to fully dissolve chitosan, prepare a chitosan solution with a mass percentage of 2%, take 15mL of the above chitosan solution and 0.0365g nanometer TiO 2 Placed in a beaker, sonicated to make nano-TiO 2 Uniformly disperse in the chitosan solution, and then add 0.15mL Tween80 to obtain the pre-emulsified aqueous phase mixture; add 100mL petroleum ether, 50mL liquid paraffin and 7.5mL emulsifier Span80 to the three-necked flask, stir mechanically, and the oil phase mixture. Add the pre-emulsified water phase mixture to the oil phase mixture evenly and slowly by spraying, control the reaction temperature at 30°C, stir for 0.5h, add 0.39mL glutaraldehyde, continue stirring for 4h, let stand, suction filter, wash, Dry to obtain chitosan-loaded nano-TiO 2 Antibacterial microspheres.

Embodiment 3

[0028] Use acetic acid solution to fully dissolve chitosan, prepare a chitosan solution with a mass percentage of 1%, take 15mL of the above chitosan solution and 0.0365g nanometer TiO 2 Placed in a beaker, sonicated to make nano-TiO 2 Uniformly disperse in the chitosan solution, and then add 0.075mL Tween80 to obtain the pre-emulsified aqueous phase mixture; add 100mL petroleum ether, 50mL liquid paraffin and 7.5mL emulsifier Span80 to the three-necked flask, and mechanically stir evenly to obtain the oil phase mixture. Add the pre-emulsified water phase mixture to the oil phase mixture evenly and slowly by spraying, control the reaction temperature at 30°C, stir for 0.5h, add 0.2mL glutaraldehyde, continue stirring for 4h, let stand, filter with suction, wash, Dry to obtain chitosan-loaded nano-TiO 2 Antibacterial microspheres.

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Abstract

The invention discloses a nano-TiO2 loaded chitosan compound and a preparation method thereof. The preparation method comprises the following steps: mixing chitosan and a nano-TiO2 solution into water to obtain an aqueous phase mixture; taking petroleum ether / liquid petrolatum as an oil phase mixture; preparing nano-TiO2 loaded chitosan anti-bacterial micro-spheres according to the suspension-cross-linking technology. As the natural antibacterial agent chitosan is taken as a wall material, a metal ion-type antibacterial agent TiO2 is taken as a core material, and the compound antibacterial agent is prepared according to the suspension-cross-linking technology, the performance and the application range of the antibacterial agent can be greatly improved through the synergistic effect and advantage complementation of chitosan and TiO2. Furthermore, after being compounded, the novel antibacterial agent is high in performance, relatively wide in anti-bacterial range, and high in stability.

Description

technical field [0001] The invention relates to a textile antibacterial microsphere and a preparation method thereof, in particular to a chitosan-loaded nano-TiO 2 Antibacterial microspheres and preparation methods thereof. [0002] technical background [0003] The antibacterial agents currently used in the market mainly include three categories: inorganic antibacterial agents, organic antibacterial agents and natural antibacterial agents. Inorganic antibacterial agents mainly include metal ion type and photocatalytic type. Metal ion type includes silver series, zinc series and copper series. Through physical adsorption, ion exchange and other methods, silver, copper, zinc and other metals (or metal ions) ) is fixed on the surface of porous materials such as fluorspar and silica gel to make antibacterial agents; the photocatalytic type is mainly anatase nano-TiO 2 , its bactericidal ability comes from its photocatalytic activity. Organic antibacterial agents have been res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/03D06M11/46D06M23/12C08J3/24C08B37/08
Inventor 任一波周文张萍武小荣赖喻珍戚文迎俞成丙
Owner 科凯精细化工(上海)有限公司