Preparation method of vinyl silicone oil with low hydroxyl content
A technology of vinyl silicone oil and low hydroxyl group, which is applied in the field of preparation of vinyl silicone oil with low hydroxyl content, can solve the problems of high silicon hydroxyl content in vinyl silicone oil, and achieve the effects of simplifying production steps, reducing consumption and improving efficiency
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Embodiment 1
[0024]DMC (100 ppm) was added to the reaction kettle with stirring and heated, tetramethyl di silicone is added, and the amount of DMC is 4.1% in the reactor; the NCK-9 cation exchange resin is added, and the amount is added. The DMC is 8%, reacted at 80 ° C for 3 hours; the vinylethoxysilane is added, and the amount of the amount of material in the reactor is 0.05%, the reaction is 1H; the resin catalyst; at 160 ° C, vacuum decentralized 3 hours, cooling Filter and get a finished product. The viscosity is 96 cp, the vinyl content of 0.816%, and the aliquot of the silicon hydroxy group is 1.2.
Embodiment 2
[0026]D4 (water content 60 ppm) was added to the reaction kettle with stirring and heated, and the low viscosity end vinyl silicone oil was added, and the amount of D4 mass in the reaction vessel was added; the potassium hydroxide silachydrate was added such that the base in the reaction system was added. The content was 40 ppm, reacted at 85 ° C for 1 hour; reaction at 105 ° C for 3 hours; the vinylmethoxysilane was added, and the amount of vinylmethoxysilane was added to 0.10% of the mass of the material in the reactor, and the reaction was 0.5 h; in phosphoric acid; at 165; The vacuum at ° C was degraded for 3 hours, and filtered, and the finished product was obtained. The viscosity of 375 cp, a vinyl content of 0.518%, and the silicon hydroxy group relative value 1.15.
Embodiment 3
[0028]DMC (water content 120 ppm) was added to the reaction kettle with stirring and heated, and tetramethyl diethylene siloxane was added, and the amount of DMC mass was 0.42% in the reactor; the tetramethylammonium oxide silicate is added. The alkali content in the reaction system was 25 ppm, reacted at 90 ° C for 1 hour; at 110 ° C for 3 hours; add vinylethoxysilane, 0.5% by weight of the material mass in the reactor, reaction 0.5 h; heating 160 ° C for 30 minutes; vacuum decentralized at 170 ° C for 4 hours, cooling filtration, and obtained product. The viscosity is 9875 cp, the vinyl content of 0.128%, and the silicon hydroxy group is resistant to 1.1.
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