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US 4,284,592 AGranted
Combustion inhibitors
AssigneeImperial Metal Industries (Kynoch) Limited
InventorsGeoffrey I. Evans, Stuart Gordon
Life of this patent
Estimating the term…
Abstract
A double base propellant charge is primed with a dimethyl siloxane resin before application of a silicone elastomer inhibitor to the primed surface. There may be a barrier coating, preferably of a polyvinyl acetal resin, between the double base material and the primer.
Claims14
A method of priming a body of gas producing material comprising nitrocellulose and an energetic nitric ester plasticiser therefor to facilitate bonding a silicone elastomer combustion inhibitor to a surface thereof which is to be inhibited, said method comprising the steps of:
- (a) coating said surface with a solution of a polyvinyl acetal, said solution containing a cross-linking agent and having dispersed therein a particulate metal, and causing or allowing the coating to cure,
- (b) applying to the coating formed in step (a) a coating of a solution of a siloxane resin, said resin having been formed by hydrolysis of a mixture comprising 92-94% by weight of difunctional chlorosilanes and 6-8% by weight of trifunctional chlorosilanes, said solution containing a cross-linking agent for the resin, and causing or allowing the coating to cure.
Dependencies are inferred from the claim text.