SILICONE OIL-TREATED FUMED SILICA, MANUFACTURING METHOD AND APPLICATION THEREOF

摘要

Provided is a silicone oil-treated fumed silica having the following physical properties A) to C) : A) the silicone oil-treated fumed silica has a degree of hydrophobicity of 68 vol% or more; B) the silicone oil-treated fumed silica has a silicone oil fixation rate of from 60 mass% to 95 mass%; and C) a composition obtained by adding 6 parts by mass of the silicone oil-treated fumed silica to 100 parts by mass of an amine composition containing trimethylolpropane polyoxypropylene triamine and 1,3-bis(aminomethyl)cyclohexane at a mass ratio of 95:5 has a viscosity of 4, 000 mPa·s or more after the composition is left to stand at 25°C for 1 hour. The silicone oil-treated fumed silica is preferably obtained by causing a silicone oil to adhere to the surface of fumed silica under an inert gas atmosphere at from 150°C to 300°C, followed by subjecting the fumed silica to high temperature treatment under an oxygen-containing gas atmosphere at from 150°C to 300°C. Also provided are a production method and applications related thereto. When the silicone oil-treated fumed silica of the present invention is mixed with an amine compound, a satisfactory thickening property and satisfactory thickening stability are obtained, and hence the silicone oil-treated fumed silica can also be used for an amine composition for a two-component epoxy-based adhesive. In addition, the silicone oil-treated fumed silica is easily produced at low cost.