Surface modification method of nano silicon dioxide

A nano-silica, surface modification technology, applied in chemical instruments and methods, dyed organosilicon compound treatment, inorganic pigment treatment, etc., can solve the problems of large amount of organic solvent, uneven modification, etc. , the effect of high modification rate and simplified preparation process

Inactive Publication Date: 2021-08-10
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of large amount of organic solvent used in the modification method of nano-silicon dioxide and uneven modification existing in the prior art, the present invention provides a surface modification method of nano-silicon dioxide. The octyltriethoxysilane coupling agent is used to modify the nano-silica particles. The coupling agent replaces the hydroxyl groups on the surface of the nano-silica to improve the dispersibility of the nano-silica in the organic dispersant or matrix. compatibility and stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 50g of nano-silica, 500g of ethanol, and 500g of pure water respectively, pour them into a 3000mL beaker, stir with a glass rod until the powder is completely wetted, carry out ultrasonic dispersion of particles under an ultrasonic vibrator, and ultrasonically treat for 18 minutes. Dip the glass rod into the mixed solution without grain feeling, adjust the PH value with hydrochloric acid until it is acidic, PH=5, and obtain an acidic dispersion;

[0025] (2) Put the acidic dispersion in step (1) in a 5 L oil bath, and heat the oil bath to 90°C and keep stirring; weigh 10g of tridecafluorooctyltriethoxysilane modifier, and use Add the dropper into the acidic dispersion solution drop by drop, and then keep it warm for 24 hours, take out the reacted dispersion solution, and dry it in an oven at a constant temperature of 80°C to obtain modified nano-silica.

Embodiment 2

[0027] (1) Weigh 50g of nano-silica, 500g of ethanol, and 500g of pure water respectively, pour them into a 3000mL beaker, stir with a glass rod until the powder is completely wetted, carry out ultrasonic dispersion of particles under an ultrasonic vibrator, and ultrasonically treat for 18 minutes. Dip the glass rod into the mixed solution without grain feeling, adjust the PH value with hydrochloric acid until it is acidic, PH=6, and obtain an acidic dispersion;

[0028] (2) Put the acidic dispersion in step (1) in a 5 L oil bath, and heat the oil bath to 90°C and keep stirring; weigh 10g of tridecafluorooctyltriethoxysilane modifier, and use Add the dropper into the acidic dispersion solution drop by drop, and then keep it warm for 30 hours, take out the reacted dispersion solution, and dry it in an oven at a constant temperature of 80°C to obtain modified nano-silica.

Embodiment 3

[0030] (1) Weigh 100g of nano-silica, 1000g of ethanol, and 1000g of pure water, pour them into a 3000mL beaker, stir with a glass rod until the powder is completely wetted, and ultrasonically disperse the particles under an ultrasonic vibrator for about 20 minutes. , the glass rod is dipped in the mixed solution without grain feeling, and the pH value is adjusted with hydrochloric acid to be acidic, PH=5, and an acidic dispersion is obtained;

[0031] (2) Put the acidic dispersion in step (1) in a 5 L oil bath, and heat the oil bath to 90°C and keep stirring; weigh 20g of tridecafluorooctyltriethoxysilane modifier, and use Add the dropper into the acidic dispersion solution drop by drop, and then keep it warm for 24 hours, take out the reacted dispersion solution, and dry it in an oven at a constant temperature of 80°C to obtain modified nano-silica.

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Abstract

The invention discloses a surface modification method of nano silicon dioxide, which comprises the steps of adding nano silicon dioxide into a mixed solution of ethanol and water, carrying out ultrasonic treatment at room temperature for 15-25 minutes, regulating the pH value to 4-6 by using hydrochloric acid to obtain an acidic dispersion liquid, heating the acidic dispersion liquid to 90-100 DEG C, adding a fluorine-containing silane coupling agent, carrying out heat-preservation reaction for 20-30 hours, and drying the reaction liquid in a drying oven at the temperature of 70-90 DEG C to obtain the modified nano silicon dioxide. Nano silicon dioxide particles are modified by the tridecafluorooctyltriethoxysilane coupling agent, and hydroxyl groups on the surface of the nano silicon dioxide are replaced by the coupling agent, so that the dispersity, compatibility and stability of the nano silicon dioxide in an organic dispersing agent or a matrix are improved.

Description

technical field [0001] The invention belongs to the technical field of functional nanometer materials, and in particular relates to a surface modification method of nano silicon dioxide. Background technique [0002] With the development of science and technology, composite materials have been widely used in various fields. Among them, as the most important component of composite materials - solid filler is an indispensable part. Among them, the application of nano-silica as a solid filler, on the one hand, the addition of fillers can reduce costs, and on the other hand, can improve the performance of composite materials. [0003] As a nano-scale material, nano-silica has a large specific surface area and high surface energy, and it is easy to agglomerate between particles. The agglomerated particles are not only difficult to exert their own advantages, but may also affect the comprehensive correlation of composite materials. performance. Moreover, during the preparation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/30C09C3/04C09C3/12
CPCC01P2004/64C01P2006/90C09C1/309C09C3/006C09C3/04C09C3/12
Inventor 朱耿增李辛庚姜波李文静姚硕王晓明田双吴亚平宗立君赵洺哲樊志彬郭凯闫风洁张振岳王蝶米春旭高智悦王倩王维娜
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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