Method for synthesizing epoxy modified organosiloxane
A technology for organosiloxane and epoxy modification, which is applied in the field of synthesizing epoxy-modified organosiloxane, which can solve problems such as loss of activity, reduce inconsistency, improve stability and storage, and facilitate reaction conditions The effect of control
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Embodiment 1
[0031] Add 3g of 1,2-epoxy-4-vinylcyclohexane to a 100ml three-necked flask equipped with a mechanical stirring device and a thermometer, add 15ml of toluene as a solvent, add 3g of ethanol as a stabilizer, add 0.17g of chloroplatinic acid- Divinyltetramethyldisiloxane complex catalyst (also known as Karstedt's catalyzer, the mass content of Pt is 2.6%), at reaction temperature is that this mixture is stirred at 80 ℃, uses dropping funnel to drop 15ml toluene and simultaneously 20g structure is MD 80 D. 6 H M mixed solution of polydimethylsiloxane. After 8 hours of reaction at 80° C., the hydrosilylation reaction can be completed. Examination of the product using infrared spectroscopy revealed complete disappearance of the silicon hydrogen peak. The mixture was vacuum distilled at 50° C. for 1 hour to remove light fractions to obtain 21.4 g of an epoxy-modified organosiloxane product. The epoxy equivalent weight of the product was determined to be 1090.
Embodiment 2
[0033] Add 20g of the structure MD to a 100ml three-neck flask equipped with a mechanical stirring device and a thermometer. 80 D. 6 HM polydimethylhydrogen silicone oil, add 15ml toluene as solvent, do not add any lower alcohol as stabilizer, add 0.17g chloroplatinic acid-divinyltetramethyldisiloxane complex catalyst (also known as Karstedt's catalyst), the mixture was stirred at a reaction temperature of 80° C., and a mixed solution of 15 ml of toluene and 3 g of 1,2-epoxy-4-vinylcyclohexane was added dropwise using a dropping funnel. After reacting for 80 minutes, the system gelled immediately and the reaction could not be continued.
Embodiment 3
[0035] Add 9g of 1,2-epoxy-4-vinylcyclohexane and 15ml of toluene to a 100ml three-necked flask equipped with a mechanical stirring device and a thermometer as a solvent, add 3g of ethanol as a stabilizer, add 0.17g of chloroplatinic acid-di Vinyltetramethyldisiloxane complex catalyst (also known as Karstedt's catalyst), the mixture was stirred at a reaction temperature of 70 ° C, while using a dropping funnel to drop 15ml of toluene and 20g of MD 42 D. 12 H M mixed solution of polydimethylsiloxane. After 8 hours at 70°C, the hydrosilylation reaction can be completed. Examination of the product using infrared spectroscopy revealed complete disappearance of the silicon hydrogen peak. The mixture was vacuum distilled at 50° C. for 1 hour to remove light fractions to obtain 22.1 g of an epoxy-modified organosiloxane product. The epoxy equivalent weight of the product was determined to be 473.
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