Method for preparing magnetic silicone rubber nanocomposite material from cyclosiloxane through in-situ ring-opening polymerization
A technology of ring-opening polymerization and cyclosiloxane is applied in the field of preparing magnetic silicone rubber nanocomposite materials by vulcanization molding, which can solve the problems of difficulty in realizing uniform dispersion of filling particles and complicated operation, achieve excellent magnetic properties and simple preparation method. , the effect of uniform dispersion
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Embodiment 1
[0045] Under the protection of nitrogen, under the condition of 100°C, 100 parts by mass of octamethylcyclotetrasiloxane (50.0g) and 1 part of tetramethyltetravinylcyclotetrasiloxane (0.5g) were mixed uniformly, and added 5 parts of iron ferric oxide nanoparticles (2.5g), 10 parts of fumed silica (5.0g), 1 part of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane (0.5g ), maintain high-speed stirring, add 0.01 parts by mass of phosphazene base catalyst toluene solution (catalyst concentration 0.05M), the polymerization reaction starts, the viscosity of the reaction system increases rapidly, and the condition of 100 ° C is maintained for 20 minutes to obtain a uniform in-situ doped Polysiloxane premix material mixed with ferric oxide particles.
[0046] The above in-situ doped polysiloxane premixed material was added into a mold, and vulcanized for 10 minutes at a vulcanization temperature of 170° C. to obtain in-situ doped ferric oxide silicon rubber nanocomposites. The silicone rub...
Embodiment 2
[0048] Under the protection of nitrogen, under the condition of 100°C, 100 parts by mass of octamethylcyclotetrasiloxane (50.0g) and 1 part of tetramethyltetravinylcyclotetrasiloxane (0.5g) were mixed uniformly, and added 20 parts of iron ferric oxide nanoparticles (10.0g) modified by silane coupling agent surface, 20 parts of fumed silica (10.0g), 1 part of 2,5-dimethyl-2,5-ditertiary Butyl peroxide hexane (0.5g), maintain high-speed stirring, add 0.01 parts by mass of phosphazene base catalyst toluene solution (catalyst concentration 0.05M), the polymerization reaction starts, the viscosity of the reaction system increases rapidly, and continue to maintain the condition of 100 ° C After 20 minutes, a uniform in-situ doped polysiloxane premixed material with ferric oxide particles was obtained.
[0049] The above in-situ doped polysiloxane premixed material was added into a mold, and vulcanized for 10 minutes at a vulcanization temperature of 170° C. to obtain in-situ doped f...
Embodiment 3
[0051] Under nitrogen protection, at 60°C, 100 parts by mass of octamethylcyclotetrasiloxane (50.0g), 1 part of tetramethylcyclotetrasiloxane (0.5g) and 1 part of tetramethylcyclotetrasiloxane Tetravinyl cyclotetrasiloxane (0.5g) mixes homogeneously, adds 20 parts of ferric oxide nanoparticles (10.0g) and 20 parts of fumed white carbon black (10.0g) through silane coupling agent surface modification, 0.01 part of Karstedt catalyst (platinum-siloxane complex, Pt content 5000ppm) (5.0mg), maintain high-speed stirring, add 0.01 part by mass of phosphazene alkali catalyst toluene solution (catalyst concentration 0.05M), the polymerization reaction starts, The viscosity of the reaction system increases rapidly, and the condition of 60° C. is maintained for 30 minutes to obtain a uniform in-situ doped polysiloxane premixed material of ferric oxide particles.
[0052] The above in-situ doped polysiloxane premixed material was added into a mold, and vulcanized for 1 hour at a vulcaniz...
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