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High temperature concrete composites containing organosiloxane crosslinked copolymers
| Details |
Inventors: Zeldin, Arkady; Carciello, Neal; Kukacka, Lawrence; Fontana, Jack;
Assignee: The United States of America as represented by the United States (Washington, DC)
Primary Examiner: Jacobs; Lewis T.
Assistant Examiner:
Attorney, Agent or Firm: Besha; Richard G., DBesha; Richard G., Cornish; Cornell D.
This invention relates to high temperature polymer concrete composites comprising about 10-30% by weight of a liquid monomer mixture consisting essentially of an organosiloxane polymer crosslinked with an olefinically unsaturated monomer selected from the group consisting of styrene, methyl methacrylate, trimethylolpropane trimethacrylate, triallyl cyanurate, n-phenylmalimide, divinyl benzene and mixtures theroef; and about 70-90% by weight of an inert inorganic filler system containing silica sand and preferably a member selected from the group consisting of portland cement, Fe.sub.2 O.sub.3, carbon black and mixtures thereof; and optionally a free radical initiator such as di-tert-butyl peroxide, azobisisobutyronitrile, benzoyl peroxide, lauryl peroxide and other organic peroxides to initiate crosspolymerization of the monomer mixture in the presence of the inorganic filler. |
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DETAILED DESCRIPTION What is claimed is: 1.
A thermally stable polymer concrete composition comprising about 10-30% by weight of a liquid monomer mixture consisting essentially of an organosiloxane polymer containing pendant groups selected from the group consisting of CH.
sub.
3, CH.
dbd.
CH.
sub.
2, C.
sub.
2 H.
sub.
5, C.
sub.
6 H.
sub.
5, and mixtures thereof, and capable of being crosslinked, and at least one olefinically unsaturated crosslinking monomer in an amount of about 15% to 50% by weight of said monomer mixture, and about 70-90% by weight of an inorganic filler system containing silica sand and portland cement in ratios ranging from about 9 parts sand to 1 part cement, to, 7 parts sand to 3 parts cement.
2.
The composition in accordance with claim 1, wherein the olefinically unsaturated monomer is selected from the group consisting of styrene, methyl methacrylate, trimethylolpropane trimethacrylate, triallyl cyanurate, n-phenylmalimide and divinyl benzene.
3.
A composition in accordance with claim 2, wherein the filler system additionally contains a member selected from the group consisting of, Fe.
sub.
2 O.
sub.
3, carbon black and mixtures thereof.
4.
A composition in accordance with claim 1, wherein the filler system is sand and portland cement in the ratio of 9:1.
5.
A composition in accordance with claim 4, wherein the organosiloxane polymer is a polydimethyl organosiloxane containing 20% pendant vinyl groups.
6.
A composition in accordance with claim 1, containing about 0.
5-2% by weight of a free radical initiator selected from the group consisting of organic peroxides and azobisisobutyronitrile.
7.
A thermally stable up to at least 260.
degree.
C.
, non-corrosive concrete of high compressive strength prepared by curing the composition of claim 6 at temperatures of about 75.
degree.
C.
to 200.
degree.
C.
8.
A thermally stable up to at least 260.
degree.
C.
, non-corrosive concrete of high compressive strength prepared by curing the composition of claim 1 at a temperature above 110.
degree.
C
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