Linear silicone acrylate and its preparation method and application
A technology of acrylate and silicone, which is applied in the field of straight-chain silicone acrylate and its preparation, can solve problems affecting the performance of release agents, molecular chain breakage of intermediates, and low molecular weight of straight-chain silicone acrylate. Good curing effect, the effect of reducing the release force
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[0025] In the first aspect, an embodiment of the present invention provides a method for preparing a linear silicone acrylate, the preparation method comprising:
[0026] After mixing the low-molecular-weight linear silicone acrylate having the structure represented by formula (I), cyclic polydimethylsiloxane and an acid catalyst, the reaction is carried out at a temperature of 60°C to 90°C, and after the reaction is completed, the After the reaction system is separated and purified, a linear silicone acrylate having a structure shown in formula (II) is obtained;
[0027]
[0028] Among them, R 1 is hydrogen or methyl, R 2 It is hydrogen or methyl, a≥1, b≥1, X≤48, Y≥75.
[0029] In the preparation method provided in the examples of the present invention, firstly prepare the low molecular weight straight chain silicone acrylate, then use cyclic polydimethylsiloxane to chain extend the low molecular weight straight chain silicone acrylate, and perform the chain extension re...
Embodiment 1
[0059] This embodiment provides a method for preparing a high molecular weight linear silicone acrylate, which specifically includes the following steps:
[0060] Add 100 parts by weight of a weight-average molecular weight Mw to a 250ml four-necked reaction flask equipped with a mechanical stirrer, a condenser tube and a thermometer, a straight-chain silicone acrylate of 3817, 200 parts by weight of octamethylcyclotetrasiloxane (available from Dow Corning Zhangjiagang Joint Venture Factory, the same below) and 15 parts by weight of Amberlyst 35 type solid acid catalyst (purchased from Rohm and Haas Company, the same below). Put the four-necked reaction bottle into an oil bath, control the temperature of the oil bath at 60°C, and stop the reaction after stirring for 24 hours. Remove the solid acid catalyst by filtration, add the resulting filtrate into a clean reaction flask, distill for 2 hours at a temperature of 90°C and a pressure of 1.3kPa to remove unreacted octamethylcy...
Embodiment 2
[0065] This embodiment provides a method for preparing a high molecular weight linear silicone acrylate, which specifically includes the following steps:
[0066] Add 76 parts by weight of linear silicone acrylate with a weight average molecular weight Mw of 3817, 228 parts by weight of octamethylcyclotetrasiloxane and 15 parts by weight solid acid catalyst. Put the four-necked reaction bottle into an oil bath, control the temperature of the oil bath at 70°C, and stop the reaction after stirring for 25 hours. Remove the solid acid catalyst by filtration, add the resulting filtrate into a clean reaction flask, distill for 2 hours at a temperature of 90°C and a pressure of 1.3kPa to remove unreacted octamethylcyclotetrasiloxane, and then filter to obtain clarification Transparent liquid.
[0067] The structure of the product was characterized by infrared absorption spectroscopy, and it was confirmed to be a straight-chain silicone acrylate; the weight-average molecular weight ...
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