Pourable Centerport Inhibitor for Solid Propellant Rocket Motors
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Solution Overview
Problem
Traditional centerport inhibitors for solid propellant rocket motors, such as pre-formed rubber boots, are difficult to install, prone to de-bonding, and can allow flames or heat to reach the propellant, potentially causing motor failure or explosion.
Innovation Solution
A pourable centerport inhibitor with a polymeric binder that cures into an amorphous solid, chemically bonding to the propellant, using a compatible cure system and plasticizers, applied by pouring into the centerport and rotating to ensure bonding, with optional additional coats for thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pre-formed rubber boot is used as a centerport inhibitor, then the centerport is protected from flames and heat, but the inhibitor is difficult to install and prone to de-bonding
Solution Approach 1:
The invention changes the physical state of the inhibitor from pre-cured solid rubber to a pourable uncured state, allowing it to be easily applied and then transformed into a bonded solid state through curing, resolving both installation difficulty and bonding stability issues
Solution Approach 2:
The inhibitor is applied in an uncured state before final curing, allowing it to be easily poured and distributed, then it cures to form a strong bond, achieving both easy application and reliable bonding
2Reliability
If a pre-cured rubber boot is installed in the centerport, then the centerport is protected, but additional materials and steps are required for installation
Solution Approach 1:
The invention removes the need for separate adhesive and barrier coat materials by using a single pourable inhibitor composition that provides both protection and bonding functionality, simplifying the overall system
Solution Approach 2:
The pourable inhibitor serves multiple functions simultaneously: it provides flame and heat protection, bonds to the propellant surface, and eliminates the need for separate adhesive and barrier layers, reducing installation complexity
3Reliability
If a rubber boot is glued into the centerport, then the centerport is protected, but the glue or adhesive may leach into the propellant
Solution Approach 1:
The invention uses a single-use pourable inhibitor composition that is applied and cured in place, eliminating the need for separate adhesive materials that could leach, and the inhibitor itself becomes the permanent protective barrier
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The pourable centerport inhibitor provides a stable, chemically bonded protection to the centerport, reducing the risk of de-bonding and ensuring even burning, thus enhancing the operational safety and reliability of the rocket motor.
Implementation Method 1
A chemical bond forms between the centerport inhibitor and the solid propellant as the inhibitor cures
Implementation Method 2
a curing system that includes a prepolymer and a curing agent. These ingredients are combined to form a pourable polymeric binder that cures into an amorphous solid
Data Source
AI summary
A pourable opaque centerport for solid propellant rocket motors and method for applying the same are disclosed. The pourable centerport inhibitor for solid propellant rocket motors has a curing system that includes a prepolymer and a curing agent. The prepolymer and the curing agent are combined to form a pourable polymeric binder that cures into an amorphous solid. The pourable centerport inhibitor also includes an opaque agent. The pourable centerport inhibitor may also include a plasticizer. The plasticizer, the prepolymer, and the curing agent are preferably the same type that is in the solid propellant with which it will be used in conjunction.