An adjuvant for reducing the slow burnout response of solid engine

A technology of solid motors and additives, applied in the direction of machines/engines, rocket motor devices, mechanical equipment, etc., which can solve the lack of control measures, unclear reaction mechanism, and the lack of solutions to reduce the slow cook-off response of solid motors and Ways and other issues

Active Publication Date: 2021-03-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Diethyl phthalate is used in both US patents 24102953 and 3808061. By adding 1% diethyl phthalate, the mechanical properties and low-temperature performance can be greatly improved, but neither mentions the improvement of slow cook-off characteristics
Since the domestic research work on slow cook-off of solid engines has just started, the reaction mechanism is unclear, and the control measures are lacking. So far, there are no articles or patents on adding additives to improve slow cook-off performance, resulting in no domestic solution to reduce the slow cook-off of solid engines. The method and approach of the cook-off response degree seriously restrict the application process of solid motors in rockets and missiles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation steps of an additive for reducing the slow cook-off response of solid motors are as follows:

[0017] (1) Add 0.5g polyacrylic acid resin (Lianyungang Iodine Factory), 0.9g hydroxypropyl methylcellulose (Dow Chemical Company) and 0.3g diethyl phthalate (Shanghai Huadong Reagent Company) to 40mL In water ethanol, stir for 5min at a stirring rate of 500r / min to obtain a mixed solution;

[0018] (2) The mixed solution is spray-dried and granulated first, and then passed through 120-mesh and 200-mesh sieves respectively to obtain spherical granule additives with a particle size of 120-200 mesh.

[0019] Mix the additive prepared in this example with the HTPB / AP / Al solid propellant at a mass ratio of 2:100, and after mixing evenly, add it to a solid motor of φ60mm×140mm and solidify to obtain HTPB containing the additive / AP / Al solid motor charge. The HTPB / AP / Al solid motor charge without additives has the same process steps and conditions as the HTPB / AP / Al...

Embodiment 2

[0022] The preparation steps of an additive for reducing the slow cook-off response of solid motors are as follows:

[0023] (1) Add 0.2g polyacrylic acid resin (Lianyungang Iodine Factory), 0.8g hydroxypropyl methylcellulose (Dow Chemical Company) and 0.2g diethyl phthalate (Shanghai Huadong Reagent Company) to 40mL In water ethanol, stir at a stirring rate of 600r / min for 5min to obtain a mixed solution;

[0024] (2) The mixed solution is spray-dried and granulated first, and then passed through 120-mesh and 200-mesh sieves respectively to obtain spherical granule additives with a particle size of 120-200 mesh.

[0025] Mix the additive prepared in this example with the HTPB / AP / Al solid propellant at a mass ratio of 5:100, and after mixing evenly, add it to a solid motor of φ25mm×100mm and solidify to obtain HTPB containing the additive / AP / Al solid motor charge. The HTPB / AP / Al solid motor charge without additives has the same process steps and conditions as the HTPB / AP / Al...

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PUM

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Abstract

The invention relates to an additive for reducing the response degree of slow cook-off of solid motors, and belongs to the technical field of slow cook-off of solid motors. The additives are composed of polyacrylic resin, hydroxypropyl methylcellulose and diethyl phthalate, which are added to the solid motor charge in a specific proportion, and are melted by absorbing heat during the slow cook-off process to cover Form a "protective film" on the surface of the energetic material particles inside the solid motor charge by coating, doping, etc., and reduce the burning rate of the energetic material through the melting and heat absorption of the "protective film" and physical barriers, so as to reduce the solid The purpose of engine slow cook-off response degree. The auxiliary agent of the invention is simple to prepare, easy to obtain raw materials, low in cost, and can greatly reduce the response degree of slow cook-off of solid motors, and has great application prospects.

Description

technical field [0001] The invention relates to an additive for reducing the response degree of slow cook-off of solid motors, and belongs to the technical field of slow cook-off of solid motors. Background technique [0002] Solid motors are the power source of rockets and missiles. Solid motors may encounter external stimuli such as heat, machinery, static electricity, and shock waves during transportation, storage, maintenance, and use. Combustion or explosion accidents may occur under different external stimuli. Thermal stimulation is one of the most common stimulation sources in the life cycle of solid motors. Therefore, the safety of thermal stimulation is also the focus of most attention of scientific research institutions and the military. [0003] Slow cook-off is the main method to characterize the thermal stimulus safety of solid motors under the condition of low heating rate. Diethyl phthalate is used in both US patents 24102953 and 3808061. By adding 1% diethyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02K9/10
CPCF02K9/10
Inventor 李军焦清介任慧
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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