Content testing method for II-interfacial free curing agent of hydroxyl terminated polybutadiene propellant

Abstract

The invention provides a content testing method for an II-interfacial free curing agent of a hydroxyl terminated polybutadiene propellant. The content testing method includes the steps of S1, subjecting the II-interfacial free curing agent of the hydroxyl terminated polybutadiene propellant to derivatization preprocessing; S2, preparing an internal standard solution; S3, performing an internal standard process separation test by using a high-performance liquid chromatograph. The content testing method for the II-interfacial free curing agent of the hydroxyl terminated polybutadiene propellant has the advantages that a novel testing technology is created, the blank in a testing aspect for free curing agent content of the hydroxyl terminated polybutadiene propellant is filled, instrument conditions can be realized easily, and the content testing method is simple and convenient to implement and high in separation efficiency, selectivity, testing precision and stability.

Description

technical field [0001] The invention relates to the field of content testing methods, in particular to a testing method for free curing agent content at the interface of butyl hydroxyl propellant II. Background technique [0002] The bonding failure of the interface between the propellant grain and the thermal insulation layer is one of the most common failure modes of solid rocket motors. Changes in the interfacial layer can lead to debonding of the propellant / liner, causing the engine to fail. According to statistics, nearly one-third of the failed solid engines in foreign countries are caused by interfacial debonding, and the debonding of the solid propellant / lining bonding interface is the most important failure mode. The quality of the interface is the main factor that determines whether the solid rocket motor can work normally. The failure mechanism research of the bonding interface is one of the keys to evaluate and improve the quality of the bonding interface. [...

AI Technical Summary

Problems solved by technology

[0003] There have always been many opinions on the problem of weak interface bonding. From the dissected samples of the debonded butyl hydroxy propellant, it is a common phenomenon that the propellant close to the liner is not well cured and sticky, so the free curing agent at the propellant interface Migration cannot be ruled out, but due to the lack of mature detection technology, this is only at the conjecture stage

[0010] The method reported above is limited to the test of free curing agent content in polyurethane reaction products with simple components, while the propellant components are relatively complex, and it is difficult to separate the components, especially the butylated hydroxyl propellant with IPDI as the curing agent. IPDI has weak UV absorption, low reactivity, and is difficult to derivatize. At present, there is no relevant literature report on the test method of IPDI content in propellant free curing agent.

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