REDISPERSIBLE EPOXY POWDER

摘要

A water redispersible polymer powder is produced by drying an aqueous mixture of a thermosettable epoxy resin having a glass transition temperature (Tg) of at least 50°C, and a colloidal stabilizer capable of dispersing the epoxy resin at a temperature above the Tg of the epoxy resin, preferably a polyvinyl alcohol, in an amount of the colloidal stabilizer of at least 2% by weight, based upon the weight of the thermosettable epoxy resin. The RDP may optionally include a hardener or curing agent, and may be hardened, cured, or crosslinked by cement ingredients when admixed with water. The water redispersible polymer powder exhibits unexpectedly superior redispersibility and good stability in cementitious formulations.