FROSTING AGENT FOR WATER-BASED POLYURETHANE AND PRODUCTION THEREOF.

摘要

A frosting agent wherein particulate silica can be suspended with good dispersibility without lowering the castability and moldability of water-based polyurethane used as a binder for mat coating compound. It is produced by compounding 100 parts by weight of particulate silica with 0.5 to 30 parts by weight of gamma -ureidopropylethoxysilane and at least 0.1 part by weight of water, and causing a reaction at 15 to 100 DEG C to modify the surface of the silica. The reaction causes the hydrolysis of the ethoxysilane group to liberate a gamma -ureidopropylsilanol group, which reacts with acidic hydroxyl groups present on the silica surface to enhance the wettability and compatibility of the frosting agent with the polyurethane, thereby improving the dispersibility of the silica and the scuffing resistance of the obtained coating film.