Preparation method for vinyl polymer coated nano-silica microsphere and modified epoxy resin
A nano-silica, vinyl polymer technology, applied in the preparation and application of nano-composite materials, can solve the problems of difficult to solve nuclear particle agglomeration, multi-core and so on
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[0034] See figure 1 , The preparation method of vinyl polymer coated nano silica microspheres in one embodiment includes the following steps:
[0035] S10. Place the nano-silica microspheres in an organic solvent, add a coupling agent after uniform dispersion, stir the reaction, and centrifuge and wash after the reaction is completed to obtain surface-modified nano-silica microspheres.
[0036] Wherein, the particle size of the nano-silica microspheres may be 70 nm-1000 nm.
[0037] The organic solvent may be toluene or xylene. The mass-volume ratio of nano-silica microspheres to organic solvent is 1:25g / mL-1:10g / mL.
[0038] The coupling agent may be a double bond type silane coupling agent. Specifically, the double bond type silane coupling agent may be γ-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, or the like.
[0039] The mass ratio of nano silica microspheres to coupling agent can be 20:1-20:8.
[0040] The temperature of the stirring reaction ...
Embodiment 1
[0079] Put 5g of nano-silica microspheres (500nm) in 50mL toluene, stir for a few minutes, add γ-methacryloxypropyltrimethoxysilane, and then stir and react at 145°C for 12 hours. The mass ratio of nano-silica microsphere particles to γ-methacryloxypropyltrimethoxysilane is 20:1. After the reaction is completed, it is centrifuged and washed with ethanol for 4 times to obtain surface-modified nano-silica Microspheres.
[0080] Weigh 1g of the dried surface-modified nano-silica microspheres in a mixed solution of 90g ethanol / water=65 / 35, and then sonicate for 30min to make the silica microspheres uniformly dispersed in the solution to form an emulsion A.
[0081] Then 10g of the above emulsion A, 0.25g buffer NaHCO 3 , The mixed solution of emulsifier SDBS with masses of 0.01g, 0.03g, and 0.05g is ultrasonicated for 10min to make it uniformly dispersed. Then it was put together with 2 mL of monomeric styrene into a three-necked flask equipped with a reflux condenser and an electric...
Embodiment 2
[0085] Put 5g of nano-silica microspheres (500nm) in 50mL of xylene, stir for a few minutes, add vinyltrimethoxysilane, and then stir and react at 145°C for 15 hours. Among them, nano-silica microspheres The mass ratio of the particles to the vinyltrimethoxysilane is 20:8, and after the reaction is completed, they are centrifuged and washed with ethanol for 5 times to obtain surface-modified nano-silica microspheres.
[0086] Weigh 1g of the dried surface-modified nano-silica microspheres in a mixed solution of 90g ethanol / water=65 / 35, and then sonicate for 15min to disperse the silica microspheres evenly in the solution to form an emulsion B.
[0087] Then 10g the above emulsion B, 0.03g emulsifier SDBS, 0.25g buffer NaHCO 3 The mixed solution is sonicated for 30min to make it evenly dispersed. Then respectively put 0.5mL, 2mL, 3.5mL of monomeric styrene into a three-necked flask equipped with reflux condenser and electric stirrer, stir at a certain speed, and perform pre-emulsif...
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