Non-flammable polymer composite panels
AssigneeHC Chem Research and Service Corp.
InventorsMing-Ta S. Hsu, Timothy S. Chen
Life of this patent
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Abstract
Non-flammable, fibrous-siloxane cured composites derived from the polymerization of dialkoxysilanes, trialkoxysilanes and tetraalkoxysilanes, in an aqueous medium, to obtain viscous polysiloxane resins. These siloxane resins are used to impregnate or coat various fibrous materials such as carbon fibers or glass cloth which are subsequently subjected to heat and pressure to form cured, non-flammable siloxane-impregnated composites e.g. panels having a density of about 1 to 3 g/cc. and a limited oxygen index above 30. These non-flammable, fibrous-siloxane composites are particularly useful in the manufacture of fire-proof materials for various transportation vehicles and for building materials e.g. panels as a fire barrier.
Claims20
A process of preparing non-flammable high-tensile strength, cured fibrous-siloxane composites having a density ranging from 1 to 3 g/cc. and a limited oxygen index above 30 which comprises:
- (a) polymerizing in an aqueous medium about 50 to 95 parts by weight of at least one trialkoxysilane, about 5.0 to 50 parts by weight of at least one dialkoxysilane, and 0 to 10 parts by weight of at least one tetraalkoxysilane to obtain liquid polyalkylsiloxane resins,
- (b) impregnating fibrous materials with an effective amount of said siloxane resins to obtain fibrous-siloxane prepregs,
- (c) drying said fibrous-siloxane prepregs, and
- (d) subsequently subjecting at least two plies of said fibrous-siloxane prepregs to pressures ranging from 25 psi to 700 psi at temperatures ranging from 50° to 300° C. to obtain said non-flammable cured fibrous-siloxane composites.
A non-flammable, cured fibrous-siloxane composite having a density ranging from 1 to 3 g/cc. and a limited oxygen index above 30 comprising at least two plies of a siloxane resin-impregnated fibrous material;
- said fibrous material being impregnated with an effective amount of said siloxane resin;
- said siloxane resin derived from the polymerization of about 50 to 95 parts by weight of at least one trialkoxysilane, about 5 to 50 parts by weight of at least one dialkoxysilane and 0 to 10 parts by weight of at least one tetraalkoxysilane.
Dependencies are inferred from the claim text.