Aircraft fluid resistant sealant for use on aircraft parts

Abstract

A number of sealants are provided that are resistant to degradation by aircraft fluids. In some embodiments, the sealants are resistant to degradation by Jet A fluid and at least one of the three types of hydraulic fluids typically used in aircraft. These embodiments are also typically cure in place from a two-part polyurethane or polyurea mix, with cure to a visibly clear coating. In some embodiments, they may be sprayed on an aircraft surface or applied by hand (brush or injectable). In other of these embodiments, the sealants comprise, at least in part, a cured, soft, tacky polyurethane gel that is resistant to at least one of a synthetic hydrocarbon based or mineral oil based hydraulic fluid.

1 . An injector assembly having:
 a body with a first compartment with a first fluid and a second compartment with a second fluid;   a forcing element engaging the first and second compartments;   a mixing straw in fluid communication with first and second compartments and capable of mixing the fluids and emitting the mix from a tip at the removed end thereof when a force is applied to the forcing elements;   wherein the mix, upon cure, is a polymer mix that is resistant to degradation upon exposure to Jet A Fuel.   
     
     
         2 . The injector assembly of  claim 1  wherein the mix, upon cure, is also resistant to degradation upon exposure to a phosphate ester based hydraulic fluid. 
     
     
         3 . The injector assembly of  claim 2  wherein the mix, upon cure, is clear. 
     
     
         4 . The injector assembly of  claim 2  wherein the mix, upon cure, has an elasticity of at least 125%. 
     
     
         5 . The injector assembly of  claim 2  wherein the mix, upon cure, cures to a hardness of 85% or more of final hardness in 24 hours or less. 
     
     
         6 . The injector assembly of  claim 2  wherein the mix, upon cure, is elastomeric. 
     
     
         7 . The injector assembly of  claim 2  wherein the mix, upon cure, has a peel strength of 1-10 piw (90°, bare aluminum) 
     
     
         8 . The injector assembly of  claim 2  wherein the mix, upon cure, has a hardness of between 20-80 Shore A. 
     
     
         9 . The injector assembly of  claim 2  wherein the mix, upon cure, has a tensile strength greater than 100 psi (ASTMD 412). 
     
     
         10 . The injector assembly of  claim 2  wherein the mix, upon cure, passes the 3000 hour salt fog (ASTM B117). 
     
     
         11 . An injector assembly having:
 a body with a first compartment with a first fluid and a second compartment with a second fluid;   a forcing element engaging the first and second compartments;   a mixing straw in fluid communication with first and second compartments and capable of mixing the fluids and emitting the mix from a tip at the removed end thereof when a force is applied to the forcing elements;   wherein the mix, upon cure, is a polymer mix that is resistant to degradation upon exposure to Jet A Fuel;   wherein the mix, upon cure, is also resistant to degradation upon exposure to a phosphate ester based hydraulic fluid;   wherein the mix, upon cure, cures to a hardness of 85% or more of final hardness in 24 hours or less;   wherein the mix, upon cure, is elastomeric.   
     
     
         12 . The injector assembly of  claim 11  wherein the mix, upon cure, has a hardness of between 20-80 Shore A. 
     
     
         13 . The injector assembly of  claim 11  wherein the mix, upon cure, has a tensile strength greater than 100 psi (ASTMD 412). 
     
     
         14 . The injector assembly of  claim 11  wherein the mix, upon cure, passes the 3000 hour salt fog (ASTM B117).