Pyrolysis characteristics and kinetics of poplar treated by compound N-P flame retardant
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摘要: 为研究复合NP阻燃剂处理杨木的热解特性与阻燃机理,利用热分析法对蒸馏水、聚硅酸磷酸二氢铝(Al-Si)、NP阻燃剂(N-P)、聚硅酸磷酸二氢铝复合NP阻燃剂(N-P-Al-Si)处理杨木(编号为A、B、C、D)的燃烧性能进行探讨,分别运用Ozawa-Flynn-Wall法和修正Coats-Redfern法计算阻燃杨木活化能。结果表明:A仅有1个热解阶段,此阶段的活化能值为65~70 kJ/mol。阻燃处理材的热解大致分为2个阶段,D的主要热解阶段介于B、C之间,其热释放速率缓慢,失重速率和失重量最小。并且在不同的升温速率下D的失重趋势一致,随着升温速率的增大,失重曲线向高温方向移动。D第1、2阶段的活化能分别为120、240 kJ/mol,均显著大于C(115 kJ/mol),表明Al-Si与N-P复配后的阻燃效率得到提高。Abstract: In order to study the flame retardant mechanism and pyrolysis characteristics of poplar treated by compound N-P flame retardant, we applied thermal analysis method to analyze the combustion performance of poplar treated by distilled water, Al-Si, N-P and N-P-Al-Si, numbered as A, B, C and D, respectively. Ozawa-Flynn-Wall and Coats-Redfern (modified) were used to calculate activation energy of flame retardant poplar. The results showed that A had only one pyrolysis process, with the activation energy value of this phase 65-- 70 kJ/mol. The pyrolysis process of flame retardant treated poplar could be divided into two stages. The main pyrolysis stage of D was between that of B and C. D had the lowest weight loss rate and least weight loss, and heat release rate of this treatment was also slow. There was a similar trend of weight loss of TG curves of D at different heating rates, and weight loss curves shifted to higher temperature section with the increasing heating rate. The activation energies of the first and second phase of D (120 and 240 kJ/mol) were higher than that of C (115 kJ/mol), indicating that the flame retardant efficiency was improved when Al-Si and N-P were blended.
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Keywords:
- poplar /
- flame retardant /
- pyrolysis /
- kinetics
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