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Nano silicon dioxide particle surface modifying method based on charge environment control and application thereof

A nano-silica, particle surface technology, applied in the field of nanomaterials, can solve the problems of difficult dispersion and infiltration, strong particle surface effect, easy agglomeration, etc.

Inactive Publication Date: 2012-07-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-SiO due to the presence of surface hydroxyl groups 2 Particles have strong surface interaction and are easy to agglomerate, usually in the form of secondary aggregates, thus limiting the size of nano-SiO 2 Due to the ultra-fine effect, it is difficult to disperse and infiltrate in the polymer matrix, making it impossible to use normally in some fields

Method used

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  • Nano silicon dioxide particle surface modifying method based on charge environment control and application thereof
  • Nano silicon dioxide particle surface modifying method based on charge environment control and application thereof
  • Nano silicon dioxide particle surface modifying method based on charge environment control and application thereof

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Experimental program
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Effect test

Embodiment 1

[0020] Weigh 5g SiO 2 Put it in a beaker, add it to the xylene solution of 0.75g tetra-n-octylammonium bromide, stir and disperse it with a glass rod, add 1.5ml of silane coupling agent KH-570, and use an ultrasonic pulverizer to prepare the suspension Ultrasonic dispersion. Pour the dispersed suspension into a three-necked flask, stir, heat up, and react at a constant temperature in a boiling state for 8 hours. The treated inorganic particle suspension was suction-filtered with a Buchner funnel, then extracted in a Soxhlet extractor for 48 hours with acetone as a solvent, and then dried in vacuum to obtain nano-SiO modified by KH-570 under the control of the charge environment. 2 , denoted as SiO 2 -KH570(TOAB).

Embodiment 2

[0022] Weigh 5g SiO 2 Put it in a beaker, add it to the xylene solution of 0.73g tetra-n-octylammonium bromide, stir and disperse it fully with a glass rod, add 1.5ml of silane coupling agent KH-570, and use an ultrasonic pulverizer to prepare the suspension Ultrasonic dispersion. Pour the dispersed suspension into a three-necked flask, stir, heat up, and react at a constant temperature in a boiling state for 8 hours. The treated inorganic particle suspension was suction-filtered with a Buchner funnel, then extracted in a Soxhlet extractor for 48 hours with acetone as a solvent, and then dried in vacuum to obtain nano-SiO modified by KH-570 under the control of the charge environment. 2 , denoted as SiO 2 -KH570(TOAB).

Embodiment 3

[0024] Weigh 5g SiO 2 Put it in a beaker, add it to the xylene solution of 0.76g tetra-n-octylammonium bromide, stir and disperse it with a glass rod, add 1.5ml of silane coupling agent KH-570, and use an ultrasonic pulverizer to prepare the suspension Ultrasonic dispersion. Pour the dispersed suspension into a three-necked flask, stir, heat up, and react at a constant temperature in a boiling state for 8 hours. The treated inorganic particle suspension was suction-filtered with a Buchner funnel, then extracted in a Soxhlet extractor for 48 hours with acetone as a solvent, and then dried in vacuum to obtain nano-SiO modified by KH-570 under the control of the charge environment. 2 , denoted as SiO 2 -KH570(TOAB).

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Abstract

The invention discloses a nano silicon dioxide particle surface modifying method based on charge environment control and application thereof. The modifying method comprises the following steps of: weighing and adding 100 parts by weight of nano SiO2 into a dimethylbenzene solution containing 0.1-0.5 part by weight of tetraoctylammonium bromide, fully stirring and dispersing, then adding 0.1-3 parts by weight of silane coupling agent, carrying out constant-temperature reaction on the dispersed suspension under a boiling state after ultrasonic dispersing, carrying out subsequent processing after the reaction is ended to obtain the silane coupling agent modified nano SiO2 under charge environment control. A SiO2 particle modified by using the modifying method carries an organic matter with unsaturated double bonds on the surface, thus the dispersibility of the SiO2 particle in a polymer matrix is improved, and various performances of the polymer matrix can be greatly improved when the SiO2 particle is added in a polymer polymerization system.

Description

technical field [0001] The invention belongs to the field of nanomaterials, more specifically, relates to a nano silicon dioxide (SiO 2 ) particles, using the charge environment to control the nano-SiO 2 Particles undergo surface modification. Background technique [0002] nano-SiO 2 It is one of the extremely important high-tech ultrafine inorganic new materials. Due to its quantum size effect, small size effect, macroscopic quantum tunneling effect and surface interface effect, it is macroscopically reflected in large specific surface area, large surface energy, and strong surface adsorption. High chemical purity, excellent performance in electrical resistance, thermal resistance, etc., with its superior reinforcement, stability, thixotropy and thickening properties, it has unique characteristics in many disciplines and fields, and has an irreplaceable position. nano-SiO 2 Commonly known as white carbon black, it is widely used in various industries as catalyst carrier...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/12C08L33/12C08K9/06C08K3/36
Inventor 郑俊萍王佩佩苏强单佳慧
Owner TIANJIN UNIV
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