A kind of MQ silicone resin and preparation method thereof, a kind of silica gel primer
A technology of MQ silicone resin and solvent, which is applied in the field of silicone resin, can solve the problem that the adhesion durability of the primer cannot meet the long-term outdoor bonding requirements, and achieve the effect of enhancing the anti-aging performance
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Embodiment 1
[0040] A kind of preparation method of primer is as follows:
[0041] 1. Stir 5g of divinyltetramethyldisiloxane, 60g of hexamethyldisiloxane, 40g of ethanol and 80g of deionized water evenly, add 40g of 10mol / L concentrated hydrochloric acid, and then dissolve 50g of Ethyl orthosilicate and 80g of n-octadecyl beta-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate were slowly added dropwise for 1.5h, and the resulting solution was heated at 1000rpm / min Stir continuously under the rotating speed of , heat up to 80 ℃, react for 3 hours;
[0042] Ⅱ. Add 2 g of sodium bicarbonate to the solution obtained in step Ⅲ, carry out the neutralization reaction for 2 hours, and then let stand to separate layers;
[0043] III. Wash the precipitate obtained in IV with water until the pH is 7, distill under reduced pressure at -0.05MPa for 1h, discard the solvent, and polycondense to obtain 98g of MQ silicone resin (molecular weight: 4500.2g / mol).
[0044] Take 98g of xylene and add it to the ...
Embodiment 2
[0046] A kind of preparation method of primer is as follows:
[0047] 1. Stir 20g of divinyltetramethyldisiloxane, 30g of hexamethyldisiloxane, 80g of ethanol and 40g of deionized water evenly, add 8g of 10mol / L concentrated hydrochloric acid; then mix 250g of Ethyl orthosilicate and 10g of n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate were slowly added dropwise for 3 hours, and the resulting solution was heated at 1000rpm / min Stir continuously at a rotating speed, heat up to 60°C, and react for 2 hours;
[0048] Ⅱ. Add 2g of sodium bicarbonate to the solution obtained in step Ⅲ, carry out the neutralization reaction for 3 hours, and then let stand to separate the layers;
[0049] Ⅲ. Wash the precipitate obtained in Ⅳ with water until the pH is 7, distill under reduced pressure at -0.05MPa for 1h, discard the solvent, and polycondense to obtain 120g of MQ silicone resin (molecular weight: 5608.4g / mol).
[0050] Take 120g of xylene and add it to the above-menti...
Embodiment 3
[0052] A kind of preparation method of primer is as follows:
[0053] 1. Stir 8g of vinyldimethylethoxysilane, 55g of hexamethyldisiloxane, 50g of ethanol and 70g of deionized water evenly, add 15g of 10mol / L concentrated hydrochloric acid, and then add 220g of normal Ethyl silicate and 20g of n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate were slowly added dropwise for 1.5h, and the resulting solution was added at 1000rpm / min Stir continuously at the rotating speed, heat up to 80°C, and react for 3 hours;
[0054] Ⅱ. Add 2 g of sodium bicarbonate to the solution obtained in step Ⅲ, carry out the neutralization reaction for 2 hours, and then let stand to separate layers;
[0055] III. Wash the precipitate obtained in IV with water until the pH is 7, distill under reduced pressure for 1 h under the condition of -0.05 MPa, discard the solvent, and polycondense to obtain 180 g of MQ silicone resin (molecular weight: 5000.3 g / mol).
[0056] Take 180g of xylene and a...
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