Preparation method of vinyl polymer-coated nano-silica microspheres and modified epoxy resin
A technology of nano-silica and vinyl polymers, which is applied in the preparation of modified epoxy resins and vinyl polymer-coated nano-silica microspheres, which can solve the problems of difficult nuclear particle agglomeration and multi-core
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[0034] see figure 1 , the preparation method of the vinyl polymer coating nano-silica microsphere of one embodiment, comprises the steps:
[0035] S10, placing the nano-silica microspheres in an organic solvent, uniformly dispersing, adding a coupling agent, stirring and reacting, and centrifuging and washing after the reaction, to obtain surface-modified nano-silica microspheres.
[0036] Wherein, the particle size of the nano-silica microspheres may be 70nm-1000nm.
[0037] The organic solvent may be toluene or xylene or the like. 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 or vinyltriethoxysilane and the like.
[0039] The mass ratio of the nano-silica microspheres to the coupling agent can be 20:1-20:8.
[0040] The temperat...
Embodiment 1
[0079] 5g of nano-silica microspheres (500nm) were placed in 50mL of toluene, after stirring for a few minutes, γ-methacryloxypropyltrimethoxysilane was added, and the reaction was stirred at 145°C for 12 hours, wherein , the mass ratio of nano-silica microsphere particles to γ-methacryloxypropyltrimethoxysilane is 20:1, and after the reaction is completed, it is centrifuged and washed 4 times with ethanol to obtain surface-modified nano-silica Microspheres.
[0080] Weigh 1g of dried surface-modified nano-silica microspheres and place them in a mixed solution of 90g ethanol / water=65 / 35, and then ultrasonicate for 30min to disperse the silica microspheres evenly in the solution to form an emulsion a.
[0081] Then 10g of the above emulsion A, 0.25g buffer NaHCO 3 , the mass of the emulsifier SDBS is 0.01g, 0.03g, 0.05g mixed solution ultrasonic 10min, so that it is uniformly dispersed. Then put it into a three-neck flask equipped with a reflux condensing device and an elect...
Embodiment 2
[0085] Put 5g of nano-silica microspheres (500nm) in 50mL of xylene, add vinyltrimethoxysilane after stirring for a few minutes, and then stir and react at 145°C for 15 hours, wherein, nano-silica microspheres The mass ratio of the particles to vinyltrimethoxysilane was 20:8, and after the reaction was finished, it was centrifuged and washed 5 times with ethanol to obtain surface-modified nano-silica microspheres.
[0086] Weigh 1g of dried surface-modified nano-silica microspheres and place them in a mixed solution of 90g ethanol / water=65 / 35, and then ultrasonicate for 15min to disperse the silica microspheres evenly in the solution to form an emulsion b.
[0087] Then 10g of the above emulsion B, 0.03g emulsifier SDBS, 0.25g buffer NaHCO 3 The mixed solution was ultrasonicated for 30 minutes to make it evenly dispersed. Then put 0.5mL, 2mL, and 3.5mL of monomeric styrene into a three-necked flask equipped with a reflux condensing device and an electric stirrer, stir at a c...
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