Method for preparing high-dispersity nanosilicon dioxide particle

A nano-silica, high-dispersion technology, applied in the field of polymer chemistry and organic materials, can solve the problems that affect the dense coating of silica, large specific surface area, difficult to disperse, etc., to overcome the problem of easy agglomeration, grafting The effect of high efficiency and large application advantages

Inactive Publication Date: 2015-04-22
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] Nano-silica is widely used in coatings, chemical industry, composite materials, environmental protection, food, construction and other fields, but the particles of nano-silica are small and the specific surface area Large, strong interaction between particles, easy to agglomerate, not easy to disperse, and the defects exposed during the application process lead to the decline of the entire material performance, which limits its wide application
[0003] In order to improve its dispersibility, a variety of methods have been developed, such as the introduction of patent CN 103922352 A to improve its dispersibility under alkaline conditions by utilizing polyols; patent CN 103097467 A introduces the use of 1,4-butanediol an

Method used

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  • Method for preparing high-dispersity nanosilicon dioxide particle

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Embodiment 1

[0015] Take 0.1g of silane coupling agent KH560 and 3g of nano-silica, disperse them in toluene, stir and react at 80°C for 12h, filter, wash with acetone and dry; redisperse the obtained dry nano-silica modified particles in Add 0.5g of sodium azide to 30mL of DMF, stir and react at 30°C for 24 hours, filter with suction, wash with water and dry to obtain particles with azide groups grafted on the surface; take 10g of methyl methacrylate, 2g of maleic anhydride, Dissolve 0.015g of BPO in 50mL of toluene, bubble nitrogen for 30min, place it in an environment of 80°C for 5h, filter, and vacuum dry; take 5g of the obtained polymer and place it in a reaction flask, add 2.5g of propynyl alcohol and 25ml of tetrahydrofuran , after heating to reflux for 20 hours, add a large amount of water, filter and dry in vacuum to obtain a polymer with multiple alkyne groups on the molecular chain; take 1g of nano-silica particles grafted with azido groups and 0.4g with Polymers of multiple alk...

Embodiment 2

[0017] Other reactions are the same as in Example 1, except that the reaction for preparing the polymer is changed to: take 40g of methyl methacrylate, 2g of maleic anhydride, and 0.04g of AIBN dissolved in 100mL of toluene, and after bubbling nitrogen for 30min, place at 80°C React in the environment for 5h, concentrate, precipitate into ether, filter and dry in vacuo.

Embodiment 3

[0019] Other reactions are the same as in Example 1, except that methyl methacrylate is replaced by hydroxyethyl methacrylate.

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Abstract

The invention relates to a method for preparing high-dispersity nanosilicon dioxide particles. The method comprises the following steps: firstly, modifying nanosilicon dioxide particles to graft an azide group on the surfaces of the nanosilicon dioxide particles, preparing a polymer with a plurality of alkynyl groups on a non-terminal group of the molecular chain in a free radial polymerization mode, and finally the surfaces of the particles with the polymer through click chemistry reaction. The modified nanosilicon dioxide particles prepared by using the method are good in dispersity in organic solvents, overcome the problem of easy conglobation and have great application potential in the fields of coatings, composite materials and the like.

Description

technical field [0001] The invention particularly relates to a preparation method of highly dispersed nano silicon dioxide particles, belonging to the technical fields of polymer chemistry and organic materials. Background technique [0002] Nano-silica is widely used in coatings, chemical industry, composite materials, environmental protection, food, construction and other fields. However, nano-silica has small particles, large specific surface area, strong interaction between particles, and is easy to agglomerate and difficult to disperse. , the defects exposed during the application process lead to the degradation of the overall material performance, limiting its wide application. [0003] In order to improve its dispersibility, many methods have been developed, such as patent CN 103922352 A introducing the use of polyhydric alcohols to improve its dispersibility under alkaline conditions; patent CN 103097467 A introducing the use of 1,4-butanediol and monoethylene glycol...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/12C09C3/10C09C3/06C08G83/00C08K9/10C08K3/36
Inventor 刘志雷周建萍刘光明
Owner NANCHANG HANGKONG UNIVERSITY
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