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
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[0049] Example 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 to a three-necked reaction flask, match with a distillation device, stir, heat up to 145°C, and react for 3.5 hours , Evacuating, removing methanol, and cooling to obtain compound A.
[0052] (2) Add 729.43g of hydroxypropyl methacrylate, 0.37g of stannous chloride, and 0.68 hydroquinone to the compound A obtained in step (1), stir, heat up to 150°C, react for 4 hours, and pump Vacuum, remove methanol, and cool to obtain surface modification.
[0053] (3) Add 7g BYK2000, 300g nano-silica to 1500g xylene at a stirring speed of 2800r / min. After the addition is complete, continue to stir and disperse for 3 hours, then put the dispersion into the grinder, grind and disperse 4 After hours, grind to powde...
Example Embodiment
[0056] Example 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 vinyl trimethoxysilane, 170.12g glycidol, 0.43g stannous chloride, 0.50g hydroquinone into a three-necked reaction flask, match the distillation device, stir, heat up to 153°C, and react for 4 hours , Evacuating, removing methanol, and cooling to obtain compound A.
[0059] (2) Add 531.73 g of hydroxypropyl methacrylate, 0.37 g of stannous chloride, and 0.65 g of hydroquinone to the compound A prepared in step (1), stir, heat up to 153°C, and react for 3 hours , Vacuum, remove methanol, and cool to obtain surface modification.
[0060] (3). Add 12g BYK2000 and 460g nano-silica to 1533g xylene at a stirring speed of 3000r / min. After the addition is complete, continue to stir and disperse for 2 hours, then put the dispersion into the grinder, grind and disperse 3.5 Hours, grind to a nano-powder D50≤1...
Example Embodiment
[0063] Example 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 to a three-necked reaction flask, match with a distillation device, stir, heat up to 156°C, and react for 4 hours. Vacuuming, removing methanol, and cooling to obtain compound A.
[0066] (2) Add 412.87g of hydroxypropyl methacrylate, 0.2g of stannous chloride, and 0.4g of hydroquinone to the reaction flask of compound A, stir, raise the temperature to 156°C, react for 4 hours, and vacuum, Removal of methanol and cooling to obtain surface modification.
[0067] (3). Add 18.5g BYK2000 and 530g nano-silica to 1892.8g xylene at a stirring speed of 3500r / min. After the addition is complete, continue to stir and disperse for 3.6 hours, then put the dispersion into the grinder and grind Disperse for 5 hours,...
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