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自反应性化学物质热危险性评估的关键在于表征参数的选择和量化,单一的评估参数往往仅表征其热危险性的某一方面。综合考虑自反应性物质发生热分解反应的难易程度及其造成后果的严重程度两个方面,分别选取放热反应初始温度(To)和反应热(-ΔH)作为相应的表征参数,通过半正态分布函数对这两个指标进行标准化处理。在此基础上根据风险的定义提出了一种新的自反应性化学物质的热危险性综合评估指数(THI指数),并建立相应的热危险性分级标准,对自反应性化学物质的热危险性进行综合评估与分级。结果表明,建立的THI指数所确定的热危险性分级结果与基于活化能和最大绝热温度的RHI指数的反应危险性等级基本一致,该指数能够对自反应性化学物质的热危险性进行定量评估。
The key to the thermal risk assessment of self-reactive chemical substances lies in the selection and quantification of the characterization parameters. A single evaluation parameter often only characterizes one aspect of its thermal risk. Considering the degree of difficulty of the thermal decomposition reactions and the severity of the consequences, the initial reaction temperature (To) and the reaction heat (-ΔH) were selected as the corresponding characterization parameters respectively. The normal distribution function normalizes these two indexes. On this basis, according to the definition of risk, a new comprehensive assessment index (THI index) of the thermal risk of self-reactive chemical substances is proposed and a corresponding thermal hazard classification standard is established to assess the thermal risk of self-reactive chemical substances Sexual assessment and grading. The results show that the THI index established by the thermal risk grading results is basically consistent with the reaction risk level based on the RHI index of activation energy and maximum adiabatic temperature, which can quantitatively assess the thermal risk of self-reactive chemicals .