Silicone rubber composition
A silicone rubber composition and silicone rubber technology, applied in the field of silicone rubber compositions, can solve problems such as complex technology, high cost, and not very obvious effects
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preparation example Construction
[0073] Described preparation method specifically comprises the following steps:
[0074] (1) the silane coupling agent, SiO 2 Add particles or volatile solvents into water and stir to form an emulsion;
[0075] (2) heating the emulsion to higher than 60°C, adding persulfate as an initiator to initiate polymerization;
[0076] (3) drying to obtain a powdery product.
[0077] Preferably, the temperature during stirring in the above step (1) is 10-30°C.
[0078] Preferably, the stirring time in the above step (1) is 10-30 hours, preferably 16-24 hours.
[0079] Preferably, the polymerization temperature in the above step (2) is higher than 65°C, preferably 65-80°C.
[0080] Preferably, the polymerization reaction time in the above step (2) is 8-24 hours, preferably 14-20 hours.
[0081] The silicone rubber that the above-mentioned filler of the present invention is applicable is to have one or more polysiloxane polymers of following formula:
[0082] RR 1 2 SiO[(R 2 Si-R ...
preparation Embodiment 1
[0090] Preparation Example 1 (preparation of solid composite particle filler)
[0091] The raw material is 3-methacryloyloxypropyltrimethoxysilane (TPM), silicon dioxide particles (Ludox TM40) with a particle size of 30 nm, and the initiator is potassium persulfate. Add 0.5mL of TPM and 0.65mL of silica particle dispersion (mass fraction: 40%) into 40mL of water, stir at 15°C for 6 hours, pass nitrogen for 30 minutes, then raise the temperature to 70°C, and add 10mg of potassium persulfate to initiate polymerization , the polymerization reaction continued for 12 hours. The obtained emulsion is centrifuged, washed with ethanol for 3 times, dispersed in water, and freeze-dried to obtain the white composite particle filler.
[0092] Disperse the above powder in ethanol to prepare transmission electron microscope samples and scanning electron microscope samples, and observe the morphology of composite particles. like figure 1 As shown, the surface of the composite particle fill...
preparation Embodiment 2
[0093] Preparation Example 2 (Preparation of Hollow Composite Particle Filler)
[0094] The raw materials are 3-methacryloyloxypropyltrimethoxysilane (TPM), silicon dioxide particles (Ludox TM40) with a particle size of 30 nanometers, isoamyl acetate (PEA), and the initiator is potassium persulfate. Add 1mL of TPM, 0.65mL of silica particle dispersion, and 1mL of PEA into 40mL of water, stir at 10°C for 28 hours, pass nitrogen gas and exhaust oxygen for 30 minutes, then raise the temperature to 70°C, add 10mg of potassium persulfate to initiate polymerization, and the polymerization reaction lasts for 18 hours . The resulting emulsion was centrifuged, washed three times with ethanol, dispersed in water, and freeze-dried to obtain a white powdery solid.
[0095] Disperse the above powder in ethanol to prepare transmission electron microscope samples and scanning electron microscope samples, and observe the morphology of composite particles. like Figure 4 As shown, the parti...
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