A kind of release agent and its preparation method and application in epoxy resin potting
A technology of release agent and dispersant, which is applied in the field of release process of epoxy resin encapsulation, can solve the problems of volatilized pollutants, human health hazards, unsuitable for aerospace products, etc., and achieves good heat resistance and easy process. , the effect of good demoulding effect
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[0047] A preparation method of release agent, the steps of the method comprising:
[0048] The first step, surface activation of inorganic nanoparticles:
[0049] Mix inorganic nanoparticles with an average particle size of 10-50nm and hydrogen peroxide aqueous solution under ultrasonic conditions, and then reflux under stirring conditions to obtain a mixture, centrifuge the obtained mixture, take the precipitate, and then The precipitate is ultrasonically cleaned with deionized water, and then centrifuged. Repeat the ultrasonic cleaning with deionized water and centrifugal separation for 3-5 times to obtain nanoparticles activated by surface hydroxyl groups;
[0050] The inorganic nanoparticles are one or a mixture of nano-silica, nano-zirconia, nano-titanium dioxide, nano-alumina, nano-zinc oxide, and nano-tin oxide;
[0051] The mass concentration of the hydrogen peroxide aqueous solution is 30%, the mass ratio of the inorganic nanoparticles to the hydrogen peroxide aqueou...
Embodiment 1
[0071] Weigh 10 g of nano-silica (average particle size is 30 nm), 100 g of 30 wt % aqueous hydrogen peroxide solution, add them to a 250 ml ground-mouth Erlenmeyer flask, ultrasonically treat for 15 min, transfer the dispersion to a 250 ml single-necked round-bottomed flask, and pack Put on the serpentine condenser, stir and reflux at 90°C for 6 hours to obtain mixture A for later use; centrifuge mixture A at 12000r / min for 8 minutes to obtain a precipitate, wash the precipitate with 100ml deionized water under ultrasonic conditions, and then Centrifuge at 12000r / min for 8min to obtain a precipitate, repeat the "washing-centrifugation" operation 4 times for this precipitate, each time for ultrasonic cleaning for 30s, vacuum dry at 70°C for 10h to obtain a mixture B, and set aside;
[0072] Weigh 5g of perfluorodecyltrimethoxysilane, 100g of absolute ethanol, 40g of deionized water, and 1g of glacial acetic acid, add them into a 250ml ground-mouth Erlenmeyer flask, ultrasonicat...
Embodiment 2
[0077] Weigh 10g of nano-alumina (average particle size is 40nm) and 80g of 30wt% aqueous hydrogen peroxide solution, add them into a 250ml ground-mouth Erlenmeyer flask, ultrasonically treat for 20min, transfer the dispersion to a 250ml single-necked round-bottomed flask, load Serpentine condenser, stirred and refluxed at 90°C for 8 hours to obtain mixture A for later use; centrifuged mixture A at 10,000 r / min for 10 minutes to obtain a precipitate, washed the precipitate with 90ml deionized water under ultrasonic conditions, and then in Centrifuge at 10000r / min for 10min to obtain a precipitate, repeat the "washing-centrifugation" operation 3 times for this precipitate, each time for ultrasonic cleaning for 40s, vacuum dry at 70°C for 10h to obtain a mixture B, and set aside;
[0078] Weigh 4g of hexamethyldisilazane, 120g of absolute ethanol, 40g of deionized water, and 1.6g of glacial acetic acid, add them into a 250ml ground-mouth Erlenmeyer flask, ultrasonicate for 10min,...
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