Non-dissolving antibacterial cellulose acetate and preparation method and application thereof

A cellulose acetate, non-dissolving technology, applied in the field of non-dissolving antibacterial cellulose acetate and its preparation, can solve the problems of particle agglomeration or uneven distribution, antibacterial particles falling off and free, reducing the antibacterial performance of the film, etc. Less, more effective antibacterial activity, high antibacterial efficiency

Active Publication Date: 2017-09-19
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods all introduce antibacterial particles into the film body by doping and blending, but this method of introducing antibacterial particles tends to lead to agglomeration or uneven distribution of particles; The force between them is weak, and it is easy to cause the antibacterial particles to fall off and free during use, which will not only reduce the antibacterial performance of the film, but also cause secondary pollution

Method used

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  • Non-dissolving antibacterial cellulose acetate and preparation method and application thereof
  • Non-dissolving antibacterial cellulose acetate and preparation method and application thereof
  • Non-dissolving antibacterial cellulose acetate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) In a reaction vessel, dissolve 20g of cellulose acetate in 250mL of N,N-dimethylformamide with a water content of <0.01wt.%, and prepare a colorless and transparent cellulose acetate with a mass concentration of 80g / L prime solution;

[0049] (2) Under the condition of 1000rpm in an ice-water bath and a stirring speed, 16.8g (the amount of the substance equivalent to the hydroxyl group in the cellulose acetate of 2.0eq) bromoacetyl bromide is added dropwise to the reaction vessel, and in the process of adding, ensure The temperature of the liquid phase in the reaction vessel is maintained at 0-5°C;

[0050] (3) After the dropwise addition, the reaction system of cellulose acetate and bromoacetyl bromide was raised to 25° C., and the reaction was continued for 18 hours at a stirring speed of 1000 rpm to obtain the initial product solution;

[0051] (4) Add 2.5L of deionized water to the reaction vessel, precipitate the cellulose acetate, and then wash it with deionize...

Embodiment 2

[0059] (1) In a reaction vessel, dissolve 20g of cellulose acetate in 250mL of N,N-dimethylformamide with a water content of <0.01wt.%, and prepare a colorless and transparent cellulose acetate with a mass concentration of 80g / L prime solution;

[0060] (2) Under the condition of 1100rpm in an ice-water bath and a stirring speed, 21.0g (the amount of the substance equivalent to the hydroxyl group in the cellulose acetate of 2.5eq) bromoacetyl bromide is added dropwise to the reaction vessel, and in the process of adding, ensure The temperature of the liquid phase in the reaction vessel is maintained at 0-5°C;

[0061] (3) After the dropwise addition, the reaction system of cellulose acetate and bromoacetyl bromide was raised to 25° C., and the reaction was continued for 18 hours at a stirring speed of 1100 rpm to obtain the initial product solution;

[0062] (4) Add 2.5 L of deionized water to the reaction vessel, precipitate the cellulose acetate, and then wash it with deion...

Embodiment 3

[0079] (1) In a reaction vessel, dissolve 20g of cellulose acetate in 250mL of N,N-dimethylformamide with a water content of <0.01wt.%, and prepare a colorless and transparent cellulose acetate with a mass concentration of 80g / L prime solution;

[0080] (2) Under the condition of 1200rpm in an ice-water bath and a stirring speed, 25.1g (the amount of the substance equivalent to the hydroxyl group in the cellulose acetate of 3.0eq) bromoacetyl bromide is added dropwise to the reaction vessel, and in the process of adding, ensure The temperature of the liquid phase in the reaction vessel is maintained at 0-5°C;

[0081] (3) After the dropwise addition, the reaction system of cellulose acetate and bromoacetyl bromide was raised to 25° C., and the reaction was continued for 18 hours at a stirring speed of 1200 rpm to obtain the initial product solution;

[0082] (4) Add 2.5L of deionized water to the reaction vessel, precipitate the cellulose acetate, and then wash it with deioni...

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Abstract

The invention discloses non-dissolving antibacterial cellulose acetate and a preparation method and application thereof; the non-dissolving antibacterial cellulose acetate is prepared by substituting hydrogen on part of hydroxyl groups in cellulose acetate by bromoacetyl groups. The preparation method comprises: 1) dissolving the cellulose acetate; 2) dropwise adding bromoacetyl under quick stirring to ensure the temperature of a reaction system is kept at 0-5 DEG C; 3) allowing reacting at 20-35 DEG C under quick stirring; 4) adding deionized water to precipitate out cellulose acetate, and drying to obtain the non-dissolving antibacterial cellulose acetate. An antibacterial reverse osmosis membrane is prepared by dissolving the non-dissolving antibacterial cellulose acetate in a solvent, adding a non-solvent to obtain a casting liquid, scraping, and solidifying. According to the technical scheme provided by the application, bromo-alkyl antibacterial groups are grafted to cellulose acetate to obtain the non-dissolving antibacterial cellulose acetate having good chemical stability and good antibacterial efficiency, and a reverse osmosis membrane made with the non-dissolving antibacterial cellulose acetate has good antibacterial property.

Description

technical field [0001] The invention belongs to the field of modification and application of cellulose acetate, and in particular relates to a non-elution type antibacterial cellulose acetate and its preparation method and application. Background technique [0002] With the continuous growth of population and the continuous acceleration of industrialization, the global crisis caused by the shortage of fresh water resources has become increasingly prominent. In recent years, membrane separation technologies represented by reverse osmosis membranes have shown unique advantages in seawater desalination, brackish water desalination, and wastewater treatment and recovery. Reverse osmosis is the earliest separation technology researched in the field of osmotic separation membranes. It can intercept almost all material molecules except water, so it has unparalleled technical advantages. Compared with other membrane separation technologies, reverse osmosis membranes also have the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/14B01D71/16B01D67/00
CPCB01D67/0011B01D67/0013B01D71/16C08B3/14
Inventor 程博闻费鹏飞孟建强胡晓宇廖亮宋俊王薇
Owner TIANJIN POLYTECHNIC UNIV
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