초록

A method of making a resin-impregnated molded fiber reinforced article including use of a thermosetting resin having a specified low viscosity and fast curing time with a specified fiber content for producing an article with improved strength.

대표청구항 ▼

A process for rapidly fabricating fiber reinforced thermoset resin articles in which the fiber reinforcement comprises one or more fibers with a melting point or a glass transition temperature above about 130°C., which process comprises the steps of: (a) providing one or more of such fibers in the f

A process for rapidly fabricating fiber reinforced thermoset resin articles in which the fiber reinforcement comprises one or more fibers with a melting point or a glass transition temperature above about 130°C., which process comprises the steps of: (a) providing one or more of such fibers in the form of an interlocked mass in a heated matched metal die mold in an amount such that from about 15 to about 80 weight percent of the fabricated fiber reinforced thermoset resin article is comprised of such fibers; (b) providing in an accumulator zone a liquid body of a thermosettable organic material having a viscosity determined at 120°C., in the absence of curing agents therefor, of less than about 50 centipoise, and which is curable within three minutes upon heating to a thermoset resin composition, the viscosity of said liquid body being maintained essentially constant in the accumulator zone by keeping its temperature below that at which curing of said material is substantial; (c) closing the mold containing the interlocked mass of fibers; (d) continously injecting at least a portion of said thermosettable organic material under a substantially constant pressure of from about 2 to about 200 atmospheres from said accumulator zone into the closed mold to thereby fill the cavity in said mold; (e) curing said thermosettable organic material at such a temperature in said mold that said thermosettable organic material cures within about 3 minutes after being injected into the mold; and then (f) opening said mold and removing the cured thermoset molded article therefrom.