应用于各类塑料和橡胶的抗氧剂264在生产加工过程中存在粉尘爆炸的风险。为了减少抗氧剂264粉尘爆炸事故的发生，采用粉尘云最低着火温度实验装置与同步热分析仪，分别研究抗氧剂264粉尘云最低着火温度（MITC）的分布特性和粉尘热解过程及动力学分析。结果表明：喷尘压力增大，MITC先减小后缓慢升高，且喷尘压力为50 kPa的时候，MITC为最小值；粉尘云质量浓度增大，MITC先快速减小后缓慢增大，存在敏感浓度且粒径54~75 μm的抗氧剂264的MITC敏感浓度为889 g/m³；粉尘粒径越大，MITC越大，敏感浓度向左偏移变小，正交试验分析出粉尘粒径对MITC的影响最大。应用Coats-Redfern法算出54~75、75~111、111~150 μm粉尘活化能分别是271.085、333.098、385.343 kJ/mol，54~75 μm粉尘活化能最小，最易燃烧。研究结果为抗氧剂264粉尘事故工业预防提供数据支撑。

Antioxidant 264, which is used in various plastics and rubbers, poses a risk of dust explosion during production and processing. In order to reduce the occurrence of antioxidant 264 dust explosion accident, the minimum ignition temperature experiment device and synchronous thermal analyzer were used to study the distribution characteristics of the minimum ignition temperature (MITC) and dynamic analysis respectively. The results show that as the dust dispersion pressure increases, the MITC first decreases and then slowly rises, with the minimum MITC occurring at a dispersion pressure of 50 kPa. As the mass concentration of the dust cloud increases, the MITC first rapidly decreases and then slowly increases, with a sensitive concentration existing. For antioxidant 264 particles with a size of 54~75 μm, the sensitive concentration of MITC is 889 g/m³. The larger the dust particle size, the higher the MITC, and the sensitive concentration shifts to the left and decreases. The orthogonal experiment analysis shows that dust particle size has the greatest impact on MITC. The Coats-Redfern method was used to calculate the activation energy of dust particles with sizes of 54~75, 75~111, 111~150 μm, which were found to be 271.085, 333.098, 385.343 kJ/mol, respectively. The dust with a particle size of 54~75 μm has the lowest activation energy and is the most flammable. The research findings provide data support for the industrial prevention of antioxidant 264 dust explosion accidents.