含能材料2026，Vol.34Issue(8)：896-908,13.DOI:10.11943/CJEM2026144
3,4-二硝基吡唑吸湿性研究
Study on the Hygroscopicity of 3,4-Dinitropyrazole
摘要
Abstract
3,4-Dinitropyrazole(DNP)has a moderate melting point,high density,and excellent detonation performance,and is regarded as a promising carrier explosive for melt-cast formulations.However,DNP exhibits a certain degree of hygroscopicity under high-temperature and high-humidity conditions,which may adversely affect charge-processing operations and the final performance of explosive products.The hygroscopic behavior of DNP powder was investigated using the desiccator equilibrium method.The effects of post-treatment method,temperature,relative humidity,and particle size on moisture sorption were evalu-ated.The influence of moisture uptake on the thermal decomposition behavior of DNP was further examined,and quantum chemical calculations were performed to predict its key moisture-sorption sites.The results showed that the post-treatment meth-od had the most significant effect on the hygroscopicity of DNP,with benzene-recrystallized DNP exhibiting the lowest moisture sorption.Temperature and relative humidity had secondary effects,and the hygroscopicity of DNP increased with increasing tem-perature and relative humidity,whereas particle size had only a minor influence.When the ambient temperature was below 30℃,the critical relative humidity of DNP was higher than 84%,whereas it decreased to 75%at 40℃.Under the correspond-ing critical relative humidity conditions,the equilibrium moisture content of benzene-recrystallized DNP remained below 0.31%,with no obvious agglomeration or caking.Moreover,no significant changes were observed in the melting point or ther-mal decomposition temperature of DNP after moisture sorption.These results indicate that the hygroscopicity of DNP powder can be reduced through appropriate post-treatment and that moisture-related problems can be effectively prevented by control-ling the environmental temperature and relative humidity.Quantum chemical calculations further identified the H atom of the-NH group on the pyrazole ring as the key moisture-sorption site of DNP.关键词
3,4-二硝基吡唑/吸湿性/临界相对湿度/热分解性能/吸湿位点Key words
3,4-dinitropyrazole/hygroscopicity/critical relative humidity/thermal decomposition behavior/hygroscopic site分类
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吴玉琪,庞欣强,潘红霞,李硕,苗雨欣,王明亚,申帆帆,赵林秀,曹端林..3,4-二硝基吡唑吸湿性研究[J].含能材料,2026,34(8):896-908,13.基金项目
山西省基础研究计划资助项目(202303021222092) （202303021222092）
