US2019120174A1PendingUtilityA1

Precursor compositions for an insulation, insulated rocket motors, and related methods

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Assignee: NORTHROP GRUMMAN INNOVATION SYSTEMS INCPriority: Oct 25, 2017Filed: Oct 25, 2017Published: Apr 25, 2019
Est. expiryOct 25, 2037(~11.2 yrs left)· nominal 20-yr term from priority
Inventors:Himansu M. GajiwalaSteven B. Hall
F02K 9/34C08K 3/04F02K 9/346C08L 9/00C08L 77/10C08L 23/145C08L 23/083C08L 23/16
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Claims

Abstract

A precursor composition comprising, before curing, ethylene propylene diene monomer (EPDM), an aramid, and a carbon material comprising carbon nanotubes, graphite, or a combination thereof. A rocket motor including a reaction product of the precursor composition and a method of insulating a rocket motor are also disclosed.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A precursor composition, comprising, before curing:
 ethylene propylene diene monomer (EPDM), an aramid, and a carbon material comprising carbon nanotubes, graphite, or a combination thereof.   
     
     
         2 . The precursor composition of  claim 1 , wherein the precursor composition comprises the carbon material at from about 5.0 parts to about 50.0 parts. 
     
     
         3 . The precursor composition of  claim 1 , wherein the precursor composition comprises the carbon material at from about 8.0 parts to about 46.0 parts. 
     
     
         4 . The precursor composition of  claim 1 , wherein the precursor composition comprises the carbon material at from about 20.0 parts to about 46.0 parts. 
     
     
         5 . The precursor composition of  claim 1 , wherein the graphite comprises expandable graphite. 
     
     
         6 . The precursor composition of  claim 5 , wherein the precursor composition comprises the expandable graphite at from about 2.0 parts to about 10.0 parts. 
     
     
         7 . The precursor composition of  claim 1 , wherein the carbon material comprises carbon nanotubes and expandable graphite and the carbon material comprises from about 8.0 parts to about 46.0 parts. 
     
     
         8 . The precursor composition of  claim 1 , wherein the aramid comprises poly-p-phenylene terephthalamide. 
     
     
         9 . The precursor composition of  claim 1 , wherein the aramid comprises fibers of poly-p-phenylene terephthalamide. 
     
     
         10 . The precursor composition of  claim 1 , wherein the aramid comprises from about 5.0 parts to about 25.0 parts of the precursor composition. 
     
     
         11 . The precursor composition of  claim 1 , wherein the aramid comprises poly-p-phenylene terephthalamide fibers in pulp form. 
     
     
         12 . The precursor composition of  claim 11 , wherein the precursor composition comprises the EPDM, the poly-p-phenylene terephthalamide fibers in pulp form, the carbon nanotubes and expandable graphite, magnesium hydroxide, a polymerized 1,2-dihydro-2,2,4-trimethylquinoline, a solid chlorinated paraffin, stearic acid, a five carbon petroleum hydrocarbon, trimethylolpropane trimethacrylate, and 1,1-di-(t-butylperoxy)-3,3,5-trimethylcyclohexane) polymer. 
     
     
         13 . The precursor composition of  claim 11 , wherein the precursor composition comprises the EPDM, the poly-p-phenylene terephthalamide fibers in pulp form, the carbon nanotubes and expandable graphite, magnesium hydroxide, a polymerized 1,2-dihydro-2,2,4-trimethylquinoline, a solid chlorinated paraffin, a polychlorinated polycyclic compound, a chloroprene, stearic acid, a five carbon petroleum hydrocarbon, trimethylolpropane trimethacrylate, and 1,1-di-(t-butylperoxy)-3,3,5-trimethylcyclohexane) polymer. 
     
     
         14 . The precursor composition of  claim 11 , wherein the precursor composition comprises the EPDM, the poly-p-phenylene terephthalamide fibers in pulp form, the carbon nanotubes and expandable graphite, zinc oxide, silica, a polymerized 1,2-dihydro-2,2,4-trimethylquinoline, a solid chlorinated paraffin, stearic acid, a five carbon petroleum hydrocarbon, trimethylolpropane trimethacrylate, and 1,1-di-(t-butylperoxy)-3,3,5-trimethylcyclohexane) polymer. 
     
     
         15 . A precursor composition, comprising, before curing:
 ethylene propylene diene monomer (EPDM);   aramid fibers;   a carbon material;   an antioxidant;   a chlorinated organic compound;   a filler selected from the group consisting of zinc oxide, silica, magnesium hydroxide, and combinations thereof;   stearic acid;   a five carbon petroleum hydrocarbon;   trimethylolpropane trimethacrylate or a poly(butadiene) resin; and   1,1-di-(t-butylperoxy)-3,3,5-trimethylcyclohexane) polymer or dicumyl peroxide.   
     
     
         16 . The precursor composition of  claim 15 , wherein the antioxidant comprises a hydroquinoline compound, an amine compound, a phenol compound, or combinations thereof. 
     
     
         17 . The precursor composition of  claim 15 , wherein the chlorinated organic compound comprises a solid chlorinated paraffin, a polychlorinated polycyclic compound, a chloroprene, or combinations thereof. 
     
     
         18 . The precursor composition of  claim 15 , wherein the EPDM comprises from about from about 60 parts to about 110 parts of the precursor composition, the aramid fibers comprise from about 10.0 parts to about 25.0 parts of the precursor composition, and the carbon material comprises from about 8.0 parts to about 46.0 parts of the precursor composition. 
     
     
         19 . A rocket motor, comprising:
 a case, an insulation on at least a portion of the case, and a propellant in the case, the insulation comprising:
 a reaction product of ethylene propylene diene monomer (EPDM), an aramid, and a carbon material comprising carbon nanotubes, graphite, or a combination thereof. 
   
     
     
         20 . The rocket motor of  claim 19 , wherein the insulation on the case comprises the insulation on an inner surface of the case. 
     
     
         21 . The rocket motor of  claim 19 , wherein the insulation on the case comprises the insulation on an outer surface of the case. 
     
     
         22 . The rocket motor of  claim 19 , wherein the insulation is present on multiple portions of the case. 
     
     
         23 . A method of insulating a rocket motor, comprising:
 applying a precursor composition of an insulation to at least a portion of a rocket motor, the precursor composition comprising ethylene propylene diene monomer (EPDM), an aramid, and a carbon material comprising carbon nanotubes, graphite, or a combination thereof; and   curing the precursor composition to form the insulation.   
     
     
         24 . The method of  claim 23 , wherein applying a precursor composition of an insulation to at least a portion of a rocket motor comprises applying the precursor composition to multiple portions of the rocket motor. 
     
     
         25 . The method of  claim 24 , wherein curing the precursor composition to form the insulation comprises simultaneously curing the precursor composition on the multiple portions of the rocket motor. 
     
     
         26 . The method of  claim 23 , further comprising applying another precursor composition of an insulation to at least another portion of the rocket motor. 
     
     
         27 . The method of  claim 26 , wherein applying another precursor composition of an insulation to at least another portion of the rocket motor comprises applying the another precursor composition comprising a fiber-free EPDM composition. 
     
     
         28 . The method of  claim 26 , wherein curing the precursor composition to form the insulation comprises simultaneously curing the precursor composition and the another precursor composition.

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