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Study on Epdm Insulation Material and Its Property

Author: ZhangPingWei
Tutor: ZhangZuo
School: National University of Defense Science and Technology
Course: Military chemistry and pyrotechnics
Keywords: EPDM Within the insulation material Thermal Analysis Laser ablation Kinetic equation
CLC: TB34
Type: Master's thesis
Year: 2009
Downloads: 58
Quote: 0
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Abstract


EPDM within the insulation material is EPDM as the matrix, add ablative filler made of a vulcanized the charring anti ablative materials after mixing with other additives, has a low density, good elongation and ablation resistance etc., are widely used in solid rocket motors. Therefore, to make EPDM within the insulation materials and their properties, to explore the EPDM insulation materials in ablation mechanism is of great significance. Vulcanizing agent and paraffin oil EPDM inner insulation materials performance to determine the optimum amount of both; using the orthogonal experiment method to study the contribution of white carbon, aramid and boron phenolic resin internal insulation material properties, and to determine the best combination of three components shared. The flame retardant APP composite fire retardant and eight vinyl POSS the adiabatic material properties of EPDM within, on this basis, the synergistic effect of zinc borate of APP and composite flame retardants. The results show that: three flame retardant when used alone, the optimum amount is 20 parts; 5 parts of zinc borate with APP and composite flame retardant having a good synergistic effect. Considering EPDM insulation material in process, mechanical and ablation resistance, determine the best formula of EPDM inner insulation materials: EPDM100, paraffin oil, 30 parts of white carbon black, 15 parts of aramid, boron phenolic resin 20 parts, eight vinyl POSS20 of parts, 6 parts of a vulcanizing agent. This formula the maximum tensile strength of insulation materials 5.82MPa, the elongation at break of 482.3%, linear ablation rate of 0.0410 mm ยท s-1, charring rate of 0.121 mm s-1. By heat and high pressure differential scanning calorimetry test, heating rate and pressure changes in the thermal decomposition properties of EPDM insulation materials in single-component (EPDM, aramid, boron phenolic resin and decabromodiphenyl ether), On this basis, white carbon, aramid, boron phenolic resin and composite fire retardant EPDM insulation materials in thermal decomposition performance. The results show that: the heating rate becomes larger, EPDM, aramid and boron phenolic resin initial decomposition temperature becomes higher, the char yield also increased; pressure increases, EPDM, aramid and boron phenolic resin decomposition peak temperature increased, the reaction thermal deformation; white carbon, aramid and boron phenolic resin improves the the EPDM insulation materials in the char yield change EPDM insulation material in thermal decomposition process. Coats-Redfern method EPDM within the insulation material under normal pressure and its main component thermal decomposition kinetics equation. Using a laser as a heat source EPDM insulation materials in its carbonized layer thermal ablation test the effects of laser parameters EPDM within the insulation material ablation characteristics and carbonized layer thermochemical ablation characteristics. The results show that a certain power density with increasing irradiation time, the the EPDM insulation materials ablation performance parameters of the first smaller gradually stabilized; certain irradiation time, with the increase in power density, mass ablation rate, ablation rate larger , but the thermal ablation rate becomes small. Based on the kinetic equation, the the EPDM insulation materials in laser ablation response and carbonized layer laser thermal ablation reaction kinetics parameters. Finally, the condensed-phase product by laser ablation analysis, laser ablation EPDM insulation materials in structure and elemental composition.

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