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A kind of modified nano silicon dioxide, its preparation method and application

A nano-silica and modification technology, which is applied in the field of modified nano-silica, can solve the problems of poor dispersion stability, restriction, and reduction of cross-linking density, and achieve the effect of easy dispersion, small influence, and increased cross-linking density

Active Publication Date: 2017-08-25
SUZHOU JUFENG ELECTRICAL INSULATION SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nano-silica has high specific surface area and surface energy, is easy to agglomerate, and has poor dispersion stability, and it is added to epoxy-modified polyesterimide impregnated resin to affect its curing cross-linking reaction, reduce cross-linking density, and make nano The use of silica in epoxy-modified polyesterimide impregnating resins is restricted

Method used

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  • A kind of modified nano silicon dioxide, its preparation method and application
  • A kind of modified nano silicon dioxide, its preparation method and application
  • A kind of modified nano silicon dioxide, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0050] This embodiment provides a modified nano-silica with double bonds and epoxy groups grafted on the surface and a preparation method thereof.

[0051] (1) Add 500g of vinyltrimethoxysilane, 249.87g of glycidol, 0.38g of stannous chloride, and 0.75g of hydroquinone into a three-necked reaction flask, match with a distillation device, stir, heat up to 145°C, and react for 3.5 hours , evacuated, methanol was removed, and cooled to obtain Compound A.

[0052](2), add 729.43g hydroxypropyl methacrylate, 0.37g stannous chloride, 0.68g hydroquinone to the compound A obtained in step (1), stir, heat up to 150°C, react for 4 hours, pump Vacuum to remove methanol and cool to obtain surface modified products.

[0053] (3), add 7g BYK2000, 300g nano silicon dioxide to 1500g xylene at a stirring speed of 2800r / min, after adding, continue to stir and disperse for 3 hours, then put the dispersion into the grinder, grind and disperse for 4 hours, grind until the powder D50≤100nm, to ob...

Embodiment 2

[0057] This embodiment provides a modified nano-silica with double bonds and epoxy groups grafted on the surface and a preparation method thereof.

[0058] (1) Add 296g of vinyltrimethoxysilane, 170.12g of glycidol, 0.43g of stannous chloride, and 0.50g of hydroquinone into a three-necked reaction flask, match with a distillation device, stir, heat up to 153°C, and react for 4 hours , evacuated, methanol was removed, and cooled to obtain compound A.

[0059] (2), add 531.73g hydroxypropyl methacrylate, 0.37g stannous chloride, 0.65g hydroquinone to compound A prepared in step (1), stir, heat up to 153°C, and react for 3 hours , vacuumize, remove methanol, and cool to obtain surface modified products.

[0060] (3), add 12g BYK2000, 460g nano silicon dioxide to 1533g xylene at a stirring speed of 3000r / min, after adding, continue to stir and disperse for 2 hours, then put the dispersion into the grinder, grind and disperse for 3.5 Hours, grind to nano powder D50≤100nm, obtain ...

Embodiment 3

[0064] This embodiment provides a modified nano-silica with double bonds and epoxy groups grafted on the surface and a preparation method thereof.

[0065] (1) Add 283g of vinyltrimethoxysilane, 212g of glycidol, 0.25g of stannous chloride, and 0.49g of hydroquinone into a three-necked reaction flask, match with a distillation device, stir, heat up to 156°C, and react for 4 hours. Vacuumize, remove methanol, and cool to obtain compound A.

[0066] (2) Add 412.87g hydroxypropyl methacrylate, 0.2g stannous chloride, and 0.4g hydroquinone to the reaction flask of compound A, stir, heat up to 156°C, react for 4 hours, and vacuumize. Removal of methanol and cooling to obtain surface modified products.

[0067] (3), add 18.5g BYK2000, 530g nano-silica to 1892.8g xylene at a stirring speed of 3500r / min, after adding, continue to stir and disperse for 3.6 hours, then put the dispersion into the grinder, grind Disperse for 5 hours, grind until the nano powder D50≤100nm, and obtain th...

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Abstract

The invention relates to a modified nano-silica, its preparation method and application. In the presence of a catalyst, a nano-silica dispersion liquid with a mass fraction of a surface modification and nano-silica of 15% to 60% is prepared. React at 130°C-160°C to obtain the modified nano-silica, wherein the added amount of the surface modifier is 5%-40% of the mass of the nano-silica, and the structural formula of the surface modifier is: . Compared with ordinary nano-silica, the nano-silica grafted with double bonds and epoxy groups on the surface of the present invention has significantly improved dispersibility and dispersion stability, and has little influence on the viscosity of the system; the double bonds and epoxy groups on the surface have high Reactive, able to participate in the curing crosslinking reaction of the matrix resin, increase the crosslinking density of the system, and meet the requirements of nano-modified epoxy polyesterimide impregnated resins for surface-treated nano-silica particles.

Description

technical field [0001] The invention relates to a modified nano silicon dioxide, its preparation method and application. Background technique [0002] Epoxy-modified polyesterimide impregnated resin is widely used in the insulation treatment of motors, electrical appliances, transformers, etc., but in recent years, with the development of frequency conversion technology and its application in motors, epoxy modified The corona resistance performance of the permanent polyesterimide impregnated resin needs to be improved, and the partial discharge needs to be reduced. [0003] Nano-silica has high specific surface area and surface energy, is easy to agglomerate, and has poor dispersion stability, and it is added to epoxy-modified polyesterimide impregnated resin to affect its curing cross-linking reaction, reduce cross-linking density, and make nano The use of silica in epoxy-modified polyesterimide impregnating resins has been limited. Contents of the invention [0004] Th...

Claims

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Application Information

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IPC IPC(8): C08K9/06C08K3/36C07F7/18C08L79/08
Inventor 徐伟红周成夏宇林保平郭胜智
Owner SUZHOU JUFENG ELECTRICAL INSULATION SYST
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