Graft modified chitosan microsphere and preparation method and application thereof

A technology of chitosan microspheres and graft modification, applied in the direction of botany equipment and methods, applications, chemical instruments and methods, etc., can solve the problems of residual odor, secondary pollution, inconvenient use, etc., and achieve non-pollution, The effect of resource saving, simple operation process and experimental equipment

Active Publication Date: 2017-08-22
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the former is costly, consumes a lot of energy, and is inconvenient to use; the latter will leave an unpleasant smell and there is a risk of "secondary pollution"

Method used

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  • Graft modified chitosan microsphere and preparation method and application thereof
  • Graft modified chitosan microsphere and preparation method and application thereof
  • Graft modified chitosan microsphere and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) Place 1.0g chitosan (CTS) in 50ml mass fraction of 4% acetic acid solution, stir until dissolved, use nitrogen as protective gas, stir with 250r / min rotation speed for 15min, add 200mL of liquid paraffin, After stirring for another 10 minutes, the temperature was raised to 50°C, and 4 drops of emulsifier Span80 was added dropwise, and emulsified for 10 minutes.

[0068] (2) Add 2 mL of formaldehyde in step (1), react at 50°C for 1.5h, then raise the temperature to 70°C, add 10% NaOH aqueous solution dropwise, and adjust the pH of the solution to 9. Afterwards, 4 mL of epichlorohydrin was slowly added dropwise, and after reacting for 5 hours, it was washed with distilled water, then petroleum ether and absolute ethanol in sequence, and then washed with water repeatedly until the pH value reached neutral. Dry to constant weight in a vacuum desiccator at 50°C.

[0069] (3) The cross-linked chitosan microspheres prepared in step (2) were heated to 60° C. for 9 h with 3...

Embodiment 2

[0107] (1) Put 1.0g chitosan (CTS) in 50ml mass fraction of 4% acetic acid solution, stir until dissolved, use nitrogen as protective gas, stir at 250r / min rotation speed for 15min, then add 200mL of liquid paraffin. After stirring for another 10 minutes, the temperature was raised to 50°C, and 4 drops of emulsifier Span80 was added dropwise, and emulsified for 10 minutes.

[0108] (2) Add 2 mL of formaldehyde in step (1), react at 50°C for 2h, then raise the temperature to 70°C, add 10% NaOH aqueous solution dropwise, and adjust the pH of the solution to 9. Afterwards, 4 mL of epichlorohydrin was slowly added dropwise, and after reacting for 5 hours, it was washed with distilled water, then petroleum ether and absolute ethanol in sequence, and then washed with water repeatedly until the pH value reached neutral. Dry to constant weight in a vacuum desiccator at 50°C.

[0109] (3) Heat the cross-linked chitosan microspheres prepared in step (2) to 60° C. with 30 mL of 1 mol / L ...

Embodiment 3

[0113] (1) Put 1.0g chitosan (CTS) in 50ml mass fraction of 4% acetic acid solution, stir until dissolved, use nitrogen as protective gas, stir at 250r / min rotation speed for 15min, then add 250mL of liquid paraffin. After stirring for another 10 minutes, the temperature was raised to 50°C, 5 drops of emulsifier Span80 was added dropwise, and emulsified for 10 minutes.

[0114] (2) Add 2 mL of formaldehyde in step (1), react at 50°C for 2h, then raise the temperature to 60°C, add 10% NaOH aqueous solution dropwise, and adjust the pH of the solution to 9. Afterwards, 5 mL of epichlorohydrin was slowly added dropwise, and after reacting for 6 hours, it was washed with distilled water, then petroleum ether and absolute ethanol in sequence, and then washed repeatedly with water until the pH value reached neutral. Dry to constant weight in a vacuum desiccator at 50°C.

[0115] (3) Heat the cross-linked chitosan microspheres prepared in step (2) to 60° C. with 30 mL of 1 mol / L hydr...

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Abstract

The invention discloses a graft modified chitosan microsphere and a preparation method thereof. The preparation method comprises the following steps: using crosslinked chitosan microspheres as a parent body, fully swelling, reacting with a ligand 2-aminobenzothiazole under the action of an initiator, carrying out a grafting reaction, washing after the reaction and drying to obtain the graft modified chitosan microsphere. The invention also provides application of the graft modified chitosan microsphere as a sterilizing agent to drinking water. The graft modified chitosan microsphere is a novel modified sterilizing agent. By introducing or generating a functional group with strong sterilization ability, action effect of solid sterilizing agent and bacteria can be enhanced. The graft modified chitosan microsphere provided by the invention can be recycled, can be used for multiple times and can effectively reduce the ''secondary pollution'', and the utilization ratio of resources can be improved. The invention is in line with China's advocacy of resource conservation and sustainable development and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of fungicides, and in particular relates to a graft modified chitosan microsphere and a preparation method and application thereof. Background technique [0002] With the rapid development of society, people's quality of life is getting higher and higher, and their safety awareness is getting stronger and stronger. China's water shortage has sounded the alarm, and more importantly, the current situation of water security is not optimistic. In recent years, the safety of drinking water has always been the focus of attention of the whole society, and there are endless news about drinking unqualified water threatening human health. Especially the safety problem caused by microbial contamination. This is mainly due to the fact that people used to drink boiled cold water, but now they drink bottled water. Bottled water has to go through multiple processes and transportation from production to sale before reaching consum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08A01N43/78A01P1/00C02F1/50
CPCA01N43/78C02F1/50C02F2303/04C08B37/003
Inventor 王彦波勇括赵新珍阎亚利熊春华
Owner ZHEJIANG GONGSHANG UNIVERSITY
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