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Low-smoke ethylene-propylene-diene monomer coating layer

A technology of EPDM and EPDM rubber, applied in the field of solid propellants, can solve problems affecting laser guidance signal transmission, missile off-target, ablation, carbonization, etc., to reduce smoke, increase strength, and improve carbonization effect of ability

Inactive Publication Date: 2017-12-05
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the EPDM coating layer is prone to ablation and carbonization under the high temperature conditions of 2000K to 3000K when the solid rocket motor works, especially when the solid rocket motor finishes working and releases pressure, the carbonization of the EPDM coating layer is carbonized. Particles will be ejected from the nozzle to form black smoke, which will affect the transmission of the laser guidance signal of the solid rocket motor and cause the missile to miss the target in severe cases

Method used

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  • Low-smoke ethylene-propylene-diene monomer coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] This embodiment is implemented according to the following mass percentage composition: 77% EPDM rubber, 1.4% cumene peroxide, 0.7% sulfur, 3.7% zinc borate, 3.7% trichloroethyl phosphate, 6.5% polyimide Pulp, 7% hexa(4-hydroxymethylphenoxy) cyclotriphosphazene.

[0014] The preparation method of the coating is as follows:

[0015] (1) Double-roll mill, with a roll distance of 5mm, mixes EPDM rubber to make the rubber roll;

[0016] (2) Add zinc borate, hexa(4-hydroxymethylphenoxy) cyclotriphosphazene, and trichloroethyl phosphate and mix for 10 minutes;

[0017] (3) Add polyimide pulp and mix for 20 minutes;

[0018] (4) Add sulfur and cumene peroxide, mix for 10 minutes, and produce a 2mm thick green film;

[0019] (5) The raw film is vulcanized in a flat vulcanizer.

[0020] In the performance test of the examples, the smoke performance of the coating layer was tested according to WJ20187-2016; the results are as follows: the laser transmittance is 91.2%, and the visible light t...

Embodiment 2

[0022] This embodiment is implemented according to the following mass percentage composition: 80% EPDM rubber, 1.4% cumene peroxide, 0.6% sulfur, 3.5% zinc borate, 3.5% trichloroethyl phosphate, 5% polyimide Pulp, 6% hexa(4-hydroxymethylphenoxy) cyclotriphosphazene.

[0023] In this embodiment, the laser transmittance of the coating layer is 90.1%, and the visible light transmittance is 80.8%.

Embodiment 3

[0025] This embodiment is implemented according to the following mass percentage composition: 75% EPDM rubber, 1.4% cumene peroxide, 0.6% sulfur, 4% zinc borate, 4% trichloroethyl phosphate, 7% polyimide Pulp, 8% hexa(4-hydroxymethylphenoxy) cyclotriphosphazene.

[0026] In this embodiment, the laser transmittance of the coating layer is 90.8%, and the visible light transmittance is 81.4%.

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Abstract

The invention discloses a low-smoke ethylene-propylene-diene monomer coating layer. The coating layer solves the problem that the prior art has poor smoke performances. The coating layer is composed of an ethylene-propylene-diene monomer, dicumyl peroxide, sulfur, zinc borate, trichloroethyl phosphate, polyimide pulp and hexa(4-hydroxymethylphenoxy)cyclotriphosphazene, has low smoke, excellent performances, laser transmittance of 91.2% and visible light transmittance of 82.9% and is suitable for the field of solid propellants.

Description

Technical field [0001] The invention relates to a coating layer for propellant charging, which is suitable for the field of solid propellants. Background technique [0002] The coating layer is an important part of the free-loading propellant charge. Its main function is to insulate heat and control the combustion surface to ensure that the solid propellant can burn according to the design law. It is not only directly related to the internal ballistic performance of the solid rocket motor , And it is one of the determinants of propellant service life. EPDM rubber has the advantages of large fillability, low density, aging resistance, excellent mechanical properties, good compatibility with solid rocket propellants, and low price. It is an ideal coating material for free-loading engine charges. , Has been applied in many types of charge coating. However, the EPDM coating is prone to ablation and carbonization under the high temperature conditions of 2000K~3000K when the solid ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L79/08C08K13/02C08K5/14C08K3/06C08K3/38C08K5/521C08K5/5399
CPCC08K2003/387C08L23/16C08L79/08C08K13/02C08K5/14C08K3/06C08K3/38C08K5/521C08K5/5399
Inventor 李鹏杨士山刘晨刘剑侠路向辉肖啸王明星任黎张富平姚小斌
Owner XIAN MODERN CHEM RES INST
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