Preparation and properties of silicone-modified epoxy acrylate resin. (English)

A silicone-modified epoxy acrylic resin was prepared by core-shell emulsion polymerization with acrylic acid (AA), methyl methacrylate (MMA), and butyl acrylate (BA) as monomers, octamethylcyclotetrasiloxane (D 4 ) and 3-methacryloxypropyltrimethoxysilane (KH-570) as coupling agents, ammonium persulfate (APS) as initiator, as well as sodium dodecyl benzenesulfonate (SLS) and OP-10 as emulsifiers. The effects of the dosage of AA, E-44 epoxy, silicone compounds, emulsifiers, and initiator, as well as the proportions of silicone compounds and emulsifiers on the properties of the emulsion were studied. The emulsion was characterized by infrared spectroscopy and the adhesion, impact resistance, and acid/alkali resistance of its film were tested. The results showed that the emulsion prepared with AA 2% (with respect to the mass of monomers), E-44 epoxy 6%, silicone compounds (D 4 and KH-570 at a mass ratio of 2:1) 7%, emulsifiers (OP-10 and SLS at a mass ratio of 2:1) 4%, and initiator 0.6% had a solid content of 45.28%, a gelation rate of 1.74%, and a conversion rate of 98.33%. Its film featured the following properties: water absorption rate 4.08%, adhesion 0-grade, and drop height at least 50 cm at the end point of 1-kg impact test. [ABSTRACT FROM AUTHOR]

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