【作者】 胡建华； 单继业； 赵建青； 童真；

【Author】 HU Jianhua;SHAN Jiye;ZHAO Jianqing;TONG Zhen;Research Institute of Materials Science,South China University of Technology;Department of Polymer Science and Engineering,South China University of Technology;

【机构】 华南理工大学材料科学研究所； 华南理工大学高分子工程系；

【摘要】 <正>环氧树脂(EP)的极限氧指数(LOI)为19%左右,属易燃,因而需对EP进行阻燃改性。随着人们环保意识的提高,EP的无卤阻燃成为了研究热点。磷系阻燃剂被认为是提高EP阻燃性能的有效途径。其中关于9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)的阻燃研究较为系统。本文研究E51和DOPO改性线性酚醛环氧(11DB07)混合后用双氰胺(DICY)和脲类促进剂(U-52)固化,研究固化物阻燃和机械性能,并进行非等温固化动力学分析。更多还原

【Abstract】 A halogen-free flame retardant epoxy resin was prepared consisting of DOPO-based glycidyl ether of cresol formaldehyde novolac and diglycidyl ether of bisphenol A cured by dicyandiamide with accelerator U-52.The optimized epoxy resin system contained 1.5 wt%of phosphorus and achieved UL-94 V-0 grade and LOI of 32%,with high tensile strength and impact strength of 48 MPa and 14.5 kJ/m~2,respectively.The reaction activation energy and reaction order were calculated by Kissinger equation and Ozawa equation.Furthermore,the curing condition of epoxy resin was optimized according to the characteristic temperature at different heating rates.更多还原