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Method for preparing nano-titanium dioxide chitosan composite membrane by using double dispersing agents

A technology of nano-titanium dioxide and chitosan, applied in the field of materials science, can solve the problems of complex steps, high operating conditions, and unsatisfactory effect of dispersing nano-titanium dioxide, and achieves simple steps, low price, and improved mechanical properties. Effect

Inactive Publication Date: 2014-04-09
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of the above two methods, the latter method has more complicated steps and higher requirements on operating conditions; while the former, although a variety of surface-activated dispersants have been studied, the effect of dispersing nano-titanium dioxide is not satisfactory and needs to be improved.

Method used

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  • Method for preparing nano-titanium dioxide chitosan composite membrane by using double dispersing agents

Examples

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Effect test

Embodiment 1

[0022] Take 2.0000g of chitosan with an electronic balance and gradually dissolve it in 50mL of 2% (volume ratio) glacial acetic acid solution, ultrasonically dissolve for 20min, stir, stand still, and defoam for 10min, repeat three times, stand still, defoam for 6 hours, spare.

[0023] Separately weigh 0.30000 g of cetyltrimethylammonium bromide and sodium dodecylbenzenesulfonate dispersant, and dissolve each in 10 mL of distilled water. After the dissolution is completed, mix the two dispersant solutions in equal amounts to form a 20mL mixed solution, mix it with the spare 50mL chitosan solution, then add 0.0140g nano-titanium dioxide, ultrasonically disperse and dissolve for 20min, stir, stand still, and defoam. Repeat 4 times to obtain the desired mixed solution of nano-titanium dioxide and chitosan. The uniformly mixed solution was cast on a glass plate to form a film, dried at 50°C, and rinsed with deionized water until neutral. Finally, soak in 0.10% sodium hydroxide...

Embodiment 2

[0025] Take 6.0000g of chitosan with an electronic balance and gradually dissolve it in 200mL of 2% (volume ratio) glacial acetic acid solution, ultrasonically dissolve for 60 minutes, stir, stand still, and degas for 10 minutes. Repeat three times, stand still, and degas for 6 hours. spare.

[0026] Separately weigh 0.6000 g of cetyltrimethylammonium bromide and 0.9000 g of sodium dodecylbenzenesulfonate dispersant, and dissolve them in 20 mL and 30 mL of distilled water respectively. Mix 20mL of dissolved cetyltrimethylammonium bromide with 30mL of dissolved sodium dodecylbenzenesulfonate solution and mix evenly, then mix with 125mL spare chitosan solution, and add 0.0263 g nano-titanium dioxide, then ultrasonically disperse for 60 minutes, stir, stand still, and defoam. Repeat 4 times. That is, the desired mixed solution of nano-titanium dioxide and chitosan is obtained, and the uniformly mixed solution is cast on a glass plate to form a film, dried at 60° C., and rinsed....

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Abstract

The invention discloses a method for preparing a nano-titanium dioxide chitosan composite membrane by using double dispersing agents. The method comprises the following steps of: preparing 3 to 4 percent of chitosan acetic acid aqueous solution, and mixing 3 percent of hexadecyl trimethyl ammonium bromide solution and 3 percent of dodecyl sodium alkyl benzene sulfonate solution which are mixed in a certain ratio; adding certain amount of nano-titanium dioxide, performing ultrasonic dispersion, stirring, standing, defoaming, casting to form the membrane, drying and washing; and immersing by using a sodium hydroxide solution, and uncovering the membrane. According to the method, due to the adoption of ready-made commercial nanometer titanium dioxide finished products and the common dispersing agents which are low in cost and readily available, the cost of the composite membrane is reduced greatly, and the implemented process is simple and easy to operate. The prepared composite membrane is uniform in dispersion of the nano-titanium dioxide, and has the wide practical value in the fields of food refreshment and the like.

Description

technical field [0001] The invention relates to a preparation method of a material, specifically, a method for preparing a nano-titanium dioxide-chitosan composite film by using a bidispersant by using a biological material, and belongs to the field of materials science. Background technique [0002] Nano titanium dioxide (Nano-TiO 2 ) is a new type of inorganic chemical material. It has special properties such as non-toxic, antibacterial and decomposing bacteria, anti-ultraviolet, super-hydrophilic and super-lipophilic, and has broad application prospects. In recent years, some people have used chitosan (Chitosan, CS) has good film-forming properties, combined with nano-titanium dioxide to prepare nano-titanium dioxide chitosan Nano-TiO 2 / CS composite film, the composite film utilizes the antibacterial, non-toxic, anti-ultraviolet and super-hydrophilic properties of nano-titanium dioxide, and also utilizes the antibacterial, non-toxic, film-forming properties of chitosan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J3/03C08L5/08C08K3/22
Inventor 廖晓玲徐文峰
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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