Method for improving interface adhesive property of HTPB (hydroxyterminated polybutadiene) liner and NEPE (Nitrate Ester Plasticized Polyether) high-energy propellant

Abstract

The invention relates to a method for improving interface adhesive property of an HTPB (hydroxyterminated polybutadiene) liner and an NEPE (Nitrate Ester Plasticized Polyether) high-energy propellant. The method comprises the following step: adding a curing catalyst in the HTPB liner, wherein the curing catalyst is one or a combination of triphenyl bismuth (TPB), iron naphthenate, magnesium naphthenate, zinc naphthenate, zinc isoocatanoate, calcium naphthenate or stannous octoate, wherein the adding amount of the curing catalyst accounts for 0.3-2.5 percent the total weight of the HTPB liner. According to the method, the proper curing catalyst is added in the HTPB liner so that the migration loss of the curing catalyst in the interface propellant is compensated, the curing speed of the interface propellant is kept, the adverse influence of external factors to curing and mechanical property of the interface propellant is reduced, and the interface adhesive property of the liner and the propellant is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of NEPE high-energy propellant and NEPE high-energy propellant lining, and relates to a method for improving the interface bonding performance of HTPB lining and NEPE high-energy propellant. Background technique [0002] The liner is a special adhesive that connects the propellant and the heat insulation layer or shell material in the solid rocket motor. The bonding performance of the heat insulation layer / liner / propellant interface of the solid rocket motor charge is directly related to the structure of the engine. Integrity and operational reliability, the debonding of the charge interface has become one of the main failure modes of solid rocket motors. [0003] The liner / propellant bonding interface is formed during the curing of the propellant, which is a high solids content (typically 70% to 90%), low reactive binder content (typically no higher than 10%) of the energetic material, its curing process i...

AI Technical Summary

Problems solved by technology

[0003] The liner / propellant bonding interface is formed during the curing of the propellant, which is a high solids content (typically 70% to 90%), low reactive binder content (typically no higher than 10%) of the energetic material, its curing process is easily affected by external factors and its mechanical properties are lower than the design value, which directly affects the interfacial bonding performance of the liner / propellant

However, there are few research reports on how to improve the interfacial bonding performance of the liner / propellant, especially the research on improving the interfacial bonding performance of the liner and NEPE propellant has not yet been systematically reported in open literature

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