Claw-type polyvinyl silicone oil and preparation method thereof
A technology of polyvinyl silicone oil and hexavinyldisiloxane, which is applied in the field of claw-type polyvinyl silicone oil and its preparation, can solve the problems of difficult removal, scene applications with limited insulation performance requirements, and high residual potassium ions. , to achieve the effect of reducing adhesion, improving material utilization efficiency and good appearance transparency
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Embodiment 1
[0027] 100kg of dimethylsiloxane cyclic body (DMC) is filtered through a first-stage bag filter and a first-stage membrane filter, then enters a glass fiber reinforced plastic dehydration kettle, heats up to 70°C, vacuumizes at a pressure of 100Pa, and dehydrates for 4 hours to obtain a purity of 99.9995%. , DMC-1 with a water content of 15ppm, spare.
[0028] 10kg of hexavinyldisiloxane (HVDS) was filtered by a primary bag filter and a primary membrane filter respectively, and then entered into a packed tower equipped with molecular sieves for 18 hours to obtain HVDS with a purity of 99.92% and a water content of 12 ppm- 1, spare.
[0029] Catalyst: polystyrene cation exchange resin loaded with acid sites, acid site concentration 5.1 mmol / g, effective particle size 0.50-1.00 mm, uniformity coefficient ≤ 0.50, water content ≤ 0.15%.
[0030] Add 1950g of DMC-1 and 50g of HVDS-1 into the FRP stirred tank, raise the temperature to 70±2°C, and stir at a low speed for 1h to obtai...
Embodiment 2
[0032] Except that the residence time in the fluidized bed was controlled for about 4 hours, other processes and steps were the same as in Example 1 to obtain crude polymer C2 and finished product D2 respectively. Crude polymer C2 has a viscosity of 185cP and a conversion rate of 89.1%. Finished product D2, in the molecular formula, m=140-190, n=0, colorless and transparent appearance, 0.80% volatile matter, viscosity 304cP, relative value of silanol 1.028.
Embodiment 3
[0034] Except that the constant temperature in the stirred tank was 40±2°C and the constant temperature in the fluidized bed was 35±2°C, other processes and steps were the same as in Example 1 to obtain crude polymer C3 and finished product D3 respectively. Crude polymer C3 has a viscosity of 125cP and a conversion rate of 84.1%. The finished product D3 has a molecular formula of m=800-135, n=0, colorless and transparent appearance, a volatile content of 0.78%, a viscosity of 190cP, and a relative value of silanol of 1.020.
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