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A kind of preparation method of highly dispersed nano silicon dioxide particles

A nano-silica, high-dispersity technology, applied in the fields of polymer chemistry and organic materials, can solve the problems that silica particles cannot be well dispersed, large specific surface area, difficult to disperse, etc., to overcome the problem of easy agglomeration, The effect of high grafting efficiency and large application advantages

Inactive Publication Date: 2016-05-25
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, many methods have been developed, such as patent CN103922352A introducing the use of polyols to improve its dispersibility under alkaline conditions; patent CN103097467A introducing the use of 1,4-butanediol and monoethylene glycol as chain extenders Enhance its dispersibility; in the patent CN102816458A, nano-silica or its modified product is dispersed in organosilane to form a dispersion; there are also a large number of documents reporting that the polymer compatible with the substrate is grafted on its surface by chemical reaction , the grafted reactive groups are all at one end of the molecular chain or compound, which will lead to the steric hindrance effect caused by the grafted molecular chain, which will affect the dense coating of other molecular chains on the silica surface, resulting in two Silica particles cannot be dispersed well, or a large amount of polymer must be grafted to achieve the dispersion effect

Method used

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  • A kind of preparation method of highly dispersed nano silicon dioxide particles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 0.1g of silane coupling agent KH5600 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 24h, 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, BPO0 Dissolve .015g in 50mL toluene, bubble nitrogen for 30min, place in 80°C environment 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 then vacuum-dry 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 The polymer of two alkyne groups was dispersed i...

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 preparation method of highly dispersed nano-silica particles. Firstly, the nano-silica particles are modified to graft azide groups on the surface, and then the non-terminal groups of the molecular chains are prepared by free radical polymerization. A polymer of multiple alkyne groups, and finally use the click chemical reaction to coat the polymer on the surface of the particle. The nano silica particles modified by the method are well dispersed in organic solvents, overcome the problem of easy agglomeration, 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 CN103922352A introducing the use of polyols to improve its dispersibility under alkaline conditions; patent CN103097467A introducing the use of 1,4-butanediol and monoethylene glycol as chain extend...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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