摘要
将磷杂菲/硼酸酯双基分子复合阻燃剂(ODOPB-Borate)分别与有机改性蒙脱土(OMMT)和二氧化硅(SiO_2)复配制备了阻燃环氧树脂(EP)。并通过热失重、极限氧指数、锥形量热燃烧实验、扫描电子显微镜等研究了含硅无卤阻燃剂OMMT、SiO_2与ODOPB-Borate的协同作用对EP阻燃性能的改善。结果表明,OMMT,SiO_2分别与ODOPB-Borate复配可有效提高EP的阻燃性能,当阻燃剂的添加量为4%(质量分数,下同),且OMMT/ODOPB-Borate和SiO_2/ODOPB-Borate的质量比均为1∶7时,EP的极限氧指数分别提升到38.8%和38.5%,达到UL 94 V-0级;OMMT和SiO_2的添加降低了EP/ODOPB-Borate体系的热释放速率(HRR),提高了其阻燃体系的屏障保护作用,并优化了气相和凝聚相阻燃效应的分配,证实了OMMT和SiO_2与ODOPB-Borate之间存在协同阻燃效应。
The flame retardant epoxy compounds were prepared by mixing phosphoheterophene-borate molecular hybrid (ODOPB-Borate) with organic modified montmorillonite (OMMT) and SiO2,the synergistic effect of silicon-containing halogen-free flame retardants consisting of OMMT, SiO2 and ODOPB-Borate on the flame retardant performance of epoxy resin was investigated by means of thermogravimetric analysis, limiting oxygen index (LOI) and cone calorimetry. The results indicated that a combination of OMMT, SiO2 and ODOPB-Borate could effectively improve the flame retardant effect on epoxy resin. When 4 wt% of binary-combined flame retardant was incorporated at the OMMT/ODOPB-Borate or SiO2/ODOPB-Borate mass ratio of 1/7, the resulting epoxy compound achieved an LOI of 38.5 vol%~38.8 vol% as well as a UL 94 V-0 classification in the vertical burning test. Based on the experimental results in this work, the introduction of OMMT and SiO2could reduce the heat release rate of epoxy/ODOPB-Borate compounding system, improve their barrier protection, and optimize the distribution of flame retardant effect in the gas phase and condensed phase. These results confirmed a synergistic flame retardant effect between OMMT, silicon dioxide and ODOPB-Borate.
作者
汤朔
孟乃奇
刘祯
赵晗
陈柄彤
王明昊
钱立军
TANG Shuo;MENG Naiqi;LIU Zhen;ZHAO Han;CHEN Bingtong;WANG Minghao;QIAN Lijun(School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China;Environment-friendly Fire Retardant Engineering Laboratory, Shandong Brothers Polytron Technologies Inc, Weifang 262714,China;Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing 100048,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2019年第5期25-29,共5页
China Plastics
基金
国家自然科学基金(21374003
51503008)
关键词
硅系阻燃剂
阻燃机理
有机改性蒙脱土
二氧化硅
协同阻燃作用
silicone flame retardant
flame retardant mechanism
organic modified montmorillonite
silicon dioxide
synergistic flame retarding effect
