Vol. 34, No. 1, 2020: 136-142
DOI：10.3969/j.issn.1003-9015.2020.01.017
Study on Combustion Characteristics and pyrolysis kinetics of fire-proof silica gel for aircraft designated area
Zhang Xu 1, bu Qingwei 2, Wang Zhi 1
(1) Shenyang University of Aeronautics and Astronautics Liaoning Province Key Laboratory of aircraft fire prevention and reliability airworthiness technology, Shenyang 110136, Liaoning Province;
2. Shenyang Rubber Research and Design Institute Co., Ltd., Shenyang 110021, Liaoning)
Abstract: by blending part a and part B of dapco 2200 aircraft designated fire zone sealant, and through condensation reaction at an ambient temperature higher than 13 ℃, cross-linking and vulcanization, a kind of high temperature resistant silica gel elastomer without primer was formed, and dapco was studied by cone calorimeter, smoke density box and thermogravimetry differential thermal analyzer 2200 burning characteristics of sealant in designated fire area under different fire environments. The cone calorimetric test and analysis show that different heat radiation intensity has great influence on the sealant in the designated fire area of dapco 2200. The greater the heat radiation intensity is, the shorter the ignition time is, the greater the mass loss after combustion is, the earlier the heat release is, and the larger the peak value is, the maximum peak value can reach 160.4 kW × m-2; the total smoke production can reach 38.1 at most The test results of MJ × m-2; smoke density meter show that under the same radiation intensity, the fire area sealant produces more smoke in the flameless combustion environment than in the flamed combustion environment, reaching 443.5, on the contrary, the mass loss of the flameless combustion is smaller than that of the flamed combustion, accounting for only 12.1% of the total mass; the thermogravimetry differential thermal analysis test shows that the heating rate has an effect on dapco 2200 The pyrolysis of sealant in designated fire area has a significant effect, and its decomposition has two obvious stages. With the acceleration of heating rate, the maximum decomposition temperature gradually moves to the high temperature direction. The pyrolysis analysis of dapco 2200 sealant in designated fire area by using coats Redfern method shows that the minimum activation energy is 78.9 kJ × mol-1 when the conversion rate is 20%, and the maximum activation energy is 164.6 when the conversion rate is 50% kJ×mol-1。