摘要
采用非等温差示扫描量热法研究了国产电缆终端用环氧浇注料的固化动力学过程,利用Ozawa-Flynn-Wall法和Friedman-Reich-Levi法2种方法对固化反应活化能进行计算,并且通过Málek判据判断出环氧浇注料在各升温速率下的固化过程均符合自催化模型。从实验和理论计算的角度对环氧材料固化过程进行了深入的分析,通过最小二乘法拟合求得自催化模型剩余固化动力学参数,并且建立了该国产电缆终端用环氧浇注料的固化动力学模型,指前因子为1.11×10^(6) min^(-1),表观活化能为67.32 kJ/mol,固化剂反应阶数n为1.117,自催化反应阶数m为0.315。采用该动力学模型对非等温固化条件下的固化度随温度变化,及等温固化条件下的固化度随时间变化的计算预测值与实验实测值基本一致,证明了建立的固化动力学模型的正确性,可以指导环氧浇注料固化工艺参数的设定。
The curing kinetics of casting epoxy for domestic cable terminals was studied by non-isothermal differential scanning calorimetry.The activation energy of curing reaction was calculated by Ozawa-Flynn-Wall method and Friedman-Reich-Levi method and the curing process of the casting epoxy was judged as autocatalytic model by MáLek criterion.The curing kinetic parameters were obtained by least square fitting,and the curing kinetic model of the domestic casting epoxy for cable terminal was established.The simulated results suggested that the pre-exponential factor,the apparent activation,and the reaction order(m,n)were calculated to be 1.11×10^(6) min^(-1),67.32 kJ/mol,and(0.315,1.117),respectively.The calculated and predicted values of curing degree with temperature under non-isothermal curing conditions and curing degree with time under isothermal curing conditions were basically consistent with the experimental measured values,indicating the correctness of the established curing kinetic model,which could be used to guide the formulation of curing parameters of the domestic casting epoxy materials.
作者
乔健
尹立
张翀
杨威
王琨
乐彦杰
QIAO Jian;YIN Li;ZHANG Chong;YANG Wei;WANG Kun;LE Yanjie(State Key Laboratory of Advanced Power Transmission Technology,Global Energy Interconnection Research Institute Co.,Ltd.,Beijing 102211,China;Zhoushan Power Supply Company of State Grid Zhejiang Electric Power Company,Zhoushan,Zhejiang 316021,China)
出处
《塑料》
CAS
CSCD
北大核心
2022年第4期108-112,119,共6页
Plastics
基金
国家电网有限公司科技项目(5455DW180018)。
关键词
非等温差示扫描量热法
电缆终端
环氧浇注料
固化动力学
自催化模型
non-isothermal differential scanning calorimetry
cable terminals
casting epoxy
curing kinetics
autocatalytic model
