Method of making a pumpable, stable polydiorganosiloxane-silica mixture and room temperature curing sealant

摘要

A process is disclosed of making a pumpable, stable, polydiorganosiloxane-silica universal mixture by mixing and heating a polydiorganosiloxane, a reinforcing silica filler and a diol surface modifying agent at 50 DEG C. to 180 DEG C. using 0.05 to 0.5 part by weight of the diol per one part by weight of the silica. The mixture is used to make RTV silicone sealant compositions which are non-sag.