Epoxy function group-containing silicone resin preparation method
A technology of epoxy functional groups and silicone resin, which is applied in the field of silicone resin preparation, can solve the problems of low epoxy value, easy color or opacity of the product, and achieve low epoxy value, high controllability of epoxy value, side effects less responsive effect
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[0031] Example 1
[0032] A. Synthetic silicone resin: In a 500ml reaction flask equipped with a constant pressure burette, stirring, refluxing and heating devices, sequentially add 124.8 grams of ethyl orthosilicate, 89.4 grams of hexamethyldisiloxane, and 8.9 grams of vinyl. Double seal head and 28.9 grams of ethanol, stir well. When the system was heated to 25°C, 4.3 g of hydrochloric acid and 32.4 g of deionized water were added dropwise as catalysts, and the dropping was completed in one hour. After dripping, the temperature was raised to 40°C to 45°C for half an hour. The temperature is raised and refluxed for 2-4 hours, and the temperature is lowered. Use toluene as the extractant to separate the acid water layer and wash with water until it is neutral.
[0033] B. Polycondensation reaction: In a 500ml reaction flask equipped with nitrogen inlet and outlet, stirring, water separation and heating devices, take 140 grams of the product of step A adjusted to 50% with toluene...
Example Embodiment
[0035] Example 2
[0036] A. Synthetic silicone resin: In a 500ml reaction flask equipped with a constant pressure burette, stirring, reflux and heating devices, add 250 grams of ethyl orthosilicate, 110 grams of hexamethyldisiloxane, and 6.7 grams of vinyl. Double-head and 42g ethanol, stir well. When the system was heated to 25°C, 4.1 g of hydrochloric acid and 62.8 g of deionized water were added dropwise as catalysts, and the dropping was completed in one hour. After dripping, the temperature was raised to 40°C to 45°C for half an hour. The temperature is raised and refluxed for 2-4 hours, and the temperature is lowered. Use toluene as the extractant to separate the acid water layer and wash with water until it is neutral.
[0037] B. Polycondensation reaction: In a 500ml reaction flask equipped with nitrogen inlet and outlet, stirring, water separation and heating devices, take 200 grams of the product of step A adjusted to 50% with toluene, and add 150 grams of silane coup...
Example Embodiment
[0039] Example 3
[0040] A. Synthetic silicone resin: In a 500ml reaction flask equipped with a constant pressure burette, stirring, refluxing and heating devices, add 198 grams of phenyltrimethoxysilane, 81 grams of hexamethyldisiloxane and 36.2 grams of ethanol. , Stir well. When the system was heated to 25°C, 3.6 grams of hydrochloric acid and 43.2 grams of deionized water were added dropwise as catalysts, and the dripping was completed in one hour. After dripping, the temperature was raised to 40°C to 45°C for half an hour. The temperature is raised and refluxed for 2-4 hours, and the temperature is lowered. Use toluene as the extractant to separate the acid water layer and wash with water until it is neutral.
[0041] B. Polycondensation reaction: In a 500ml reaction flask equipped with nitrogen inlet and outlet, stirring, water separation and heating devices, take 200 grams of the product of step A adjusted to 50% with toluene, and add 245 grams of silane coupling agent γ...
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