Sodium dichloroisocyanurate (NaDCC) is a novel and effective material for sterilization, disinfection, and bleaching. However, the utilization of NaDCC has caused several thermal runaway incidents worldwide, raising attention to exploring its unknown thermal hazards. This paper simulated the different incident conditions to conduct a comparative study on the thermal stability and decomposition of NaDCC using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and accelerating rate calorimeter (ARC). The gaseous products of the thermal decomposition of NaDCC were analyzed by a thermogravimetry-mass spectrometer (TG-MS). Several kinetic methods were used to calculate $E_a$ of the pyrolysis reaction of NaDCC under different conditions. ${\mathit{TMR}}_{ad}$ and self-accelerating decomposition temperature (SADT) were calculated based on the thermodynamic and kinetic analysis. The results of ${\mathit{TMR}}_{ad}$ showed that the adiabatic induction period decreased significantly, and the risk of losing control enlarged with increasing temperatures. Meanwhile, by comparing the SADT of NaDCC under several common packaging materials, the chemical plastic drums should be used for packaging materials of NaDCC. The result clarifies the reason for incidents and provides the fundamentals and valuable data for safe preparation, production, transportation, and storage of NaDCC.

二氯异氰尿酸钠（NaDCC）是一种新型有效的杀菌、消毒、漂白材料。然而，NaDCC 的使用在全球范围内引发了多起热失控事件，引起了人们对探索其未知热危害的关注。本文模拟了不同的入射条件，利用热重分析（TGA）、差示扫描量热法（DSC）和加速量热仪（ARC）对NaDCC的热稳定性和分解进行了对比研究。通过热重-质谱仪 (TG-MS) 分析 NaDCC 热分解的气态产物。几种动力学方法用于计算${乙}_{\mathrm{一个}}$NaDCC在不同条件下的热解反应。${\mathit{TMR}}_{\mathrm{一个}d}$基于热力学和动力学分析计算了自加速分解温度（SADT）。结果${\mathit{TMR}}_{\mathrm{一个}d}$表明绝热诱导期显着缩短，失控风险随温度升高而增大。同时，通过比较几种常见包装材料下NaDCC的SADT，NaDCC的包装材料应选用化学塑料桶。结果阐明了事故原因，为NaDCC的安全制备、生产、运输和储存提供了基础和有价值的数据。