DEVELOPMENT OF ALTERNATE SILICONE POTTING COMPOUNDS Vol. 4. Development of a Substitute fornDow Coming's Aerospace Sealant DC 93-120 Resin Cured with DC 93-122 Curing Agent

摘要

A substitute for Dow Corning DC 93-120 silicone potting resin cured with DC 93-122 silicone curing agent can be formulated from Dielectric Gel Q3-6527, accelerator QCF3-6559, and DC 1107 fluid. The substitute is much lower in viscosity than the material it replaces, but it is equally fast setting, friable, and weak as measured by butt-tensile strength to aluminum.nWe evaluated two lots of Q3, three lots of DC 1107, and two lots of accelerator. The 1107 and accelerator are minor components whose lot-to-lot variations are not significant. The only significant variable is the reaction rate of the Q3. Because Q3 cannot be activated by the platinum-containing accelerator alone to a gel time of 15min, the active hydrogen concentrate DC 1107 is needed. Using both accelerator and 1107 in proportions to minimize 1107 is preferred because this decreases the likelihood of porosity in the cured potting compound.