Quaternary ammonium salt group containing polysiloxane block copolymer and preparation method and application

A technology of polysiloxane block and quaternary ammonium salt group, which is applied in the field of synthetic polymer biomaterials, and can solve the problem of weak ability to prevent and control fungus on the surface of plants

Active Publication Date: 2016-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary polysiloxane grafted quaternary ammonium salts have good water solubility and are difficult to attach to hydrophobic surfaces such as plant leaves, so the ability to prevent and control fungal damage on plant surfaces is weak

Method used

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  • Quaternary ammonium salt group containing polysiloxane block copolymer and preparation method and application
  • Quaternary ammonium salt group containing polysiloxane block copolymer and preparation method and application
  • Quaternary ammonium salt group containing polysiloxane block copolymer and preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0094] The preparation of the polysiloxane block copolymer containing quaternary ammonium salt group: the segment length ratio is PDMS: PDMS-g-BC: PDMS=1: 4: 1, the block containing quaternary ammonium salt group (PDMS -g-BC), the proportion (grafting ratio) of the total number of chain members grafted with quaternary ammonium salt groups is 1 / 5, and the halogenated hydrocarbon is benzyl chloride.

[0095] (1) Protection of aminodisiloxane head (BAPTMDS): in the reaction kettle equipped with mechanical stirring and condenser, feed according to the molar ratio of raw materials BAPTMDS: phthalic anhydride = 1: 2.2, use the total amount of raw materials The raw materials were dissolved in tetrahydrofuran twice the mass, and reacted at 60°C for 4 hours. After the reaction, the solvent THF was distilled off under reduced pressure, the product was dissolved in chloroform, the product was washed 5 times with hot water at 55°C, and the chloroform layer was distilled under reduced pres...

Embodiment 2

[0107] Preparation of polysiloxane block copolymer (PDMS-b-(PDMS-g-BB)-b-PDMS) containing grafted butyldimethylammonium chloride groups: the ratio of segment length is PDMS:PDMS -g-BB: PDMS=1:5:1, in the block (PDMS-g-BB) containing the quaternary ammonium salt group, the proportion of chain members grafted with the quaternary ammonium salt group to the total number of chain members ( Grafting ratio) is 1 / 4, and halogenated hydrocarbon is n-butane bromide.

[0108] (1) Protection of aminodisiloxane head (BAPTMDS): in the reaction kettle equipped with mechanical stirring and condenser, feed according to the raw material molar ratio BAPTMDS: phthalic anhydride = 1: 2.4, use the total raw material The raw material was dissolved in dichloromethane with twice the mass, and reacted at 70°C for 5 hours. After the reaction, the solvent THF was distilled off under reduced pressure, the product was dissolved in chloroform, the product was washed three times with hot water at 60°C, and ...

Embodiment 3

[0118] Preparation of polysiloxane block copolymer (PDMS-b-(PDMS-g-HEB)-b-PDMS) containing grafted hexyldimethylammonium bromide groups: the ratio of segment length is PDMS:PDMS- g-HEB: PDMS = 1:5:1, in the block containing quaternary ammonium salt groups, the proportion of chain members grafted with quaternary ammonium salt groups to the total number of chain members (grafting ratio) is 1 / 3 , The halogenated hydrocarbon is n-hexane bromide.

[0119] (1) Protection of aminodisiloxane head (BAPTMDS): In the reaction kettle equipped with mechanical stirring and condenser, feed according to the raw material molar ratio BAPTMDS: phthalic anhydride = 1: 2.6, and use the total raw material The raw materials were dissolved in tetrahydrofuran twice the mass, and reacted at 80°C for 6 hours. After the reaction, the solvent THF was distilled off under reduced pressure, the product was dissolved in chloroform, the product was washed 4 times with hot water at 65°C, and the chloroform lay...

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Abstract

The invention discloses a quaternary ammonium salt group containing polysiloxane block copolymer and a preparation method and application. The primary amino in BAPTMDS is protected, and the obtained BAPTMDS-PA2 reacts with D4 and D4H to obtain hydrogen containing polysiloxane; the hydrogen containing polysiloxane reacts with DMAA to obtain tertiary amino polysiloxane; the tertiary amino polysiloxane reacts with hydrazine hydrate to obtain tertiary amino polysiloxane with terminated amino; D3 reacts with an n-butyl lithium solution to obtain single-ended hydrogen containing polysiloxane; the single-ended hydrogen containing polysiloxane reacts with tBMA to obtain single-ended ester-based polysiloxane; the single-ended ester-based polysiloxane reacts with sulfuric acid to obtain single-ended carboxyl polysiloxane; the single-ended carboxyl polysiloxane reacts with the tertiary amino polysiloxane with terminated amino and then reacts with halohydrocarbon to obtain the quaternary ammonium salt group containing polysiloxane block copolymer. The copolymer can effectively adhere to the hydrophobic surfaces of plant leaves and the like and plays the role of preventing plant fungi diseases.

Description

technical field [0001] The invention belongs to the technical field of synthetic macromolecular biomaterials, in particular to a polysiloxane block copolymer containing a quaternary ammonium salt group, a preparation method and an application. Background technique [0002] In modern life, microorganisms (bacteria, fungi, mold, yeast, etc.) are almost everywhere. With the improvement of human living standards, people's awareness of their own health and environmental protection is gradually increasing. Antimicrobial agents are a class of chemical substances with antimicrobial properties, which can inhibit the growth, reproduction and survival of bacteria, fungi and other microorganisms within a certain period of time. Antimicrobial agents are increasingly widely used in clothing, hygiene products, daily necessities, food packaging and other fields to prevent the contamination and damage of microorganisms such as bacteria, but there are few studies on antimicrobial agents used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/44C08G77/388A01N55/10A01P3/00
CPCA01N55/00C08G77/388C08G77/44
Inventor 张安强周盛文刘杨润琦雷雨风林雅铃
Owner SOUTH CHINA UNIV OF TECH
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