Combustion catalyst screening device and method based on nitrocotton stability

Abstract

The invention discloses a screening device and method for a combustion catalyst based on nitrocotton stability. The device comprises a sample tank, an airtight needle, a drying oven and a gas chromatograph, wherein the sample tank is composed of a base, a separation net, a tank body and a cap. The test method comprises the following steps: respectively putting nitrocotton and a mixture of nitrocotton and a combustion catalyst into a sample tank, humidifying, heating at 90 DEG C for 3 hours, and cooling; extracting reaction gas from the sample tanks, and injecting into a chromatographic instrument to detect the content of NO2, wherein the combustion catalyst which is more suitable for a nitrocotton-based solid propellant in the aspect of ensuring the chemical stability of nitrocotton can be screened out through detection results. During screening, influence factors of air and moisture are increased, an actual charging storage environment is close, the influence of poor heat conduction of nitrocotton on a detection result is avoided, and a combustion catalyst with small influence on chemical stability of the nitrocotton can be screened out.

Description

technical field [0001] The invention belongs to the technical field of combustion catalyst research, and mainly relates to a screening device and method for combustion catalysts that are more suitable for nitrocellulose-based solid propellants by ensuring the chemical stability of nitrocellulose. Background technique [0002] Solid propellants are mainly used in the engines of rockets, missiles and space shuttles. Solid propellant is a multi-component heterogeneous system, in addition to the main components of oxidizer and fuel binder, there are various other additional components. Nitrocellulose has been widely used in solid propellants as a fuel binder due to its good mechanical properties, solubility properties and combustion properties. Combustion catalysts are used in propellants as additional components to regulate and improve combustion behavior. [0003] When the combustion catalyst is added to the solid propellant, its adjustment effect should be significant, and ...

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Problems solved by technology

Since nitrocellulose is in an environment with a relative humidity of 65% to 70% during production and storage, nitrocellulose contains a small amount of water, which has a certain catalytic effect on the decomposition of nitrocellulose, especially some combustion catalysts in the presence of water and without The degree of influence on the chemical stability of nitrocellulose in the water environment is different, so the above three detection methods only detect the influence of the catalyst on the chemical stability of nitrocellulose in a dry environment, which may not match the real situation and cause misjudgment

[0020] (3) From the principle of reaction, the above three methods are all aimed at the NO with self-catalysis 2 However, the operation of the iodometric method is cumbersome (collecting gas for titration, the operation steps are cumbersome), the test paper method has a large human error (relying on the human eye to observe the discoloration of the test paper that gradually changes color is a semi-quantitative result), and the pressure method test results The specificity is not strong (the detection is the decomposition gas and the amount, not the autocatalytic NO in the decomposition gas 2 content), not suitable for comparative screening of combustion catalysts

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