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Low-density ablation-resistant ethylene propylene diene monomer material and preparation method thereof

A technology of EPDM rubber and reinforcing filler is applied in the field of heat-resistant materials, which can solve the problems of affecting the loading coefficient, increasing the negative mass of the rocket engine, and burning through the thermal insulation layer.

Pending Publication Date: 2021-05-18
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the EPDM internal insulation material has general ablation resistance and erosion resistance. When it is applied to parts with serious erosion such as the tail of the engine, it is easy to cause the insulation layer to burn through. Although this problem can be solved by increasing the thickness of the insulation layer, it will increase Negative mass of the rocket motor, which affects the load factor

Method used

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  • Low-density ablation-resistant ethylene propylene diene monomer material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Add 100 parts of EPDM rubber, 25 parts of reinforcing filler, 15 parts of organic fiber, 5 parts of inorganic fiber, 5 parts of ammonium salt flame retardant, 3 parts of lightweight filler, 10 parts of metal hydroxide filler, 20 parts of tackifying resin and 5 parts of petroleum-based softener are added to the internal mixer and mixed evenly, and the highest mixing temperature does not exceed 90°C;

[0048] 2) Add 2 parts of peroxide vulcanizing agent to 1) the internal mixer and mix evenly, and the maximum mixing temperature shall not exceed 60°C;

[0049] 3) The product obtained in 2) is then thinned and passed uniformly in an open mill, and the sheet is produced;

[0050] 4) The product obtained in 3) is vulcanized in a flat vulcanizing machine at 10Mpa and 160°C for 50 minutes.

Embodiment 2

[0052] 1) Add 100 parts of EPDM rubber, 20 parts of reinforcing filler, 10 parts of organic fiber, 10 parts of inorganic fiber, 5 parts of ammonium salt flame retardant, 5 parts of lightweight filler, 10 parts of metal hydroxide filler, 20 parts of tackifying resin and 5 parts of petroleum-based softener are added to the internal mixer and mixed evenly, and the highest mixing temperature does not exceed 90°C;

[0053] 2) Then add 3 parts of peroxide vulcanizing agent to 1) internal mixer and mix evenly, the maximum mixing temperature shall not exceed 60°C;

[0054] 3) The product obtained in 2) is then thinned and passed uniformly in an open mill, and the sheet is produced;

[0055] 4) The product obtained in 3) is vulcanized in a flat vulcanizing machine at 10Mpa and 160°C for 50 minutes.

Embodiment 3

[0057] 1) Add 100 parts of EPDM rubber, 20 parts of reinforcing filler, 10 parts of organic fiber, 10 parts of inorganic fiber, 10 parts of ammonium salt flame retardant, 3 parts of lightweight filler, 5 parts of metal hydroxide filler, 20 parts of tackifying resin and 5 parts of petroleum-based softener are added to the internal mixer and mixed evenly, and the highest mixing temperature does not exceed 90°C;

[0058] 2) Add 2 parts of peroxide vulcanizing agent to 1) the internal mixer and mix evenly, and the maximum mixing temperature shall not exceed 60°C;

[0059] 3) The product obtained in 2) is then thinned and passed uniformly in an open mill, and the sheet is produced;

[0060] 4) The product obtained in 3) is vulcanized in a flat vulcanizing machine at 10Mpa and 160°C for 50 minutes.

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Abstract

The invention discloses a low-density ablation-resistant ethylene propylene diene monomer material and a preparation method thereof. The low-density ablation-resistant ethylene propylene diene monomer material is prepared from 100 parts of ethylene propylene diene monomer, 15-30 parts of a reinforcing filler, 10-20 parts of organic fiber, 5-15 parts of inorganic fiber, 5-15 parts of an ammonium salt flame retardant, 3-5 parts of a light filler, 5-15 parts of a metal hydroxide filler, 10-20 parts of a tackifying resin, 5-10 parts of a petroleum softening agent and 2-4 parts of a peroxide vulcanizing agent, and is formed through mixing, open milling and hot-pressing vulcanization. According to the invention, the material not only has low density, but also can significantly improve the strength of a carbon layer and improve the ablation resistance and scouring resistance of the material by compounding the organic fiber and the inorganic fiber and matching with the ammonium salt flame retardant and the metal hydroxide filler, and is suitable for a high-temperature strong-scouring working environment of a solid rocket engine.

Description

technical field [0001] The invention relates to the technical field of heat-resistant materials, in particular to a low-density ablation-resistant EPDM material and a preparation method thereof. Background technique [0002] When the solid rocket motor is working, a high temperature of 2500-3500°C will be generated in the combustion chamber. The inner insulation material is used as the protective layer of the solid rocket motor combustion chamber. It has the characteristics of high temperature ablation resistance, high temperature particle erosion resistance and good mechanical properties. A key component of a rocket engine's proper functioning. [0003] At present, the internal insulation materials are mainly nitrile rubber and EPDM rubber. Because EPDM rubber has good heat resistance, aging resistance, chemical stability, and excellent mechanical properties, it has the same characteristics as solid rocket propellants. Good compatibility, and it has the lowest density (0.8...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08L79/08C08K13/04C08K7/04C08K3/32C08K7/22C08K7/26
CPCC08L23/16C08L2205/16C08L2205/035C08L2201/08C08L2201/02C08K2003/323C08K2003/2227C08K2003/2224C08L79/08C08K13/04C08K7/04C08K3/32C08K7/22C08K7/26
Inventor 孟思益黄活阳刘永亮罗熙雯马彦周利庄王芳谢为
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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