A process for the preparation of bubble-free and of foreign - particles - free electrically conductive polyurethanes

摘要

A method of making an electrically conductive polyurethane elastomer that is substantially free of bubbles and foreign particles comprising:PPforming a prepolymer of a polylol and an isocyanate, forming a liquid mixture of an ionic conductive additive, an amount of cross linking agent and chain extenders sufficient to provide a crosslinked elastomer;PPfiltering the liquid mixture of additive, crosslinking agents and chain extenders to remove foreign particles;P Ppreheating the liquid mixture to a temperature above the decomposition temperature of the additive, crosslinking agents and chain extenders in a degassing oven to degass to less than 5 mm of mercury to break any bubbles in the mixture and remove moisture;PPto a vacuum reactor mixer having two input ports add the prepolymer, the preheated degassed liquid mixture and mix under vacuum of less than 5 mm of mercury of a period of time to provide a uniform mixture:PPremoving the mixture from the vacuum reactor mixer and form into the desired shape,PPcure the formed shape to an elastomer substantially free of bubbles and foreign particles.