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Silicone channel sealant
| Details |
Inventors: Wright, John H.;
Assignee: General Electric Company (Waterford, NY)
Primary Examiner: Jacobs; Lewis T.
Assistant Examiner:
Attorney, Agent or Firm: Voss; Donald J., Koltos; E. Philip, Neuhauser; Frank L.
A silicone channel sealant with improved solvent and water resistance comprising a diorganopolysiloxane of 50 to 200,000 centipoise viscosity and blends of diorganopolysiloxanes wherein powdered polytetrafluoroethylene, treated and untreated silica filler, a titanate of the formula (RO).sub.4 Ti, where R is selected from alkyl radicals and haloalkyl radicals, and an organic compound containing at least one hydroxy group are present as a water resistance additive. In addition to the above basic ingredients, there can be present in the composition of the present case a silicate, a boron compound, styrene beads, a polyether, and optionally as a corrosion resistant additive such as, zinc chromium salts or iron oxide. The above channel sealant which is desirable as a channel sealant for fuel tanks of aircraft has the advantageous properties that it is both solvent resistant, water resistant, has good consistency and does not flow at low pressures but is easily injectable. |
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DETAILED DESCRIPTION I claim: 1.
A silicone channel sealant comprising 100 parts by weight of a diorganopolysiloxane of 50 to 200,000 centipoise viscosity at 25.
degree.
C, where the organo groups are selected from monovalent hydrocarbon radicals and cyanoalkyl, 10 to 150 parts by weight of powdered polytetrafluoroethylene, 4 to 25 parts by weight of untreated silica, 4 to 25 parts of a treated silica, 0.
3 to 2.
0 parts by weight of a titanate of the formula, (RO).
sub.
4 Ti where R is selected from alkyl radicals and haloalkyl radicals of 2 to 5 carbon atoms, from 0.
3 to 2.
0 parts by weight of an aliphatic hydrocarbon compound containing at least one hydroxy group and from 10 to 50 parts by weight of styrene beads.
2.
The channel sealant of claim 1 wherein there is present from 0.
5 to 10 parts by weight of a high temperature stabilizing boron additive selected from the class consisting of boric acid, trimethoxy boroxime and trialkyl borates where the alkyl group contains from 1 to 5 carbon atoms.
3.
The channel sealant of claim 2 wherein there is present from 0.
1 to 5 parts by weight of a stabilizing additive which is an alkyl silicate of the formula, R.
sup.
1 Si (OR.
sup.
2).
sub.
3 where R.
sup.
1 is selected from the class consisting of alkyl and alkoxy radicals of 1 to 8 carbon atoms and R.
sup.
2 is selected from the class consisting of alkyl, aryl, haloalkyl and alkenyl radicals of 1 to 8 carbon atoms.
4.
The channel sealant of claim 3 where there is present from 5 to 40 parts by weight of a diorganopolysiloxane having a viscosity of 1,000,000 to 200,000,000 centipoise at 25.
degree.
C, where the organo groups are selected from alkyl of 1 to 5 carbon atoms and cyanoalkyl of 2 to 5 carbon atoms wherein the polymer is dimethylvinyl end-stopped.
5.
The channel sealant of claim 4 wherein there is present from 100 to 10,000 parts per million of a peroxide.
6.
The channel sealant of claim 5 wherein there is present a polyether stabilizer at a concentration of 0.
1 to 2 parts by weight of the formula, R
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Adhesives and Rubbers 
