HP-RTM树脂体系固化反应动力学及流变行为研究

Studies on the Kinetics of Curing Reaction and Rheological Behavior of HP-RTM Resin System

HP-RTM(高压树脂传递模塑)工艺是近些年针对汽车行业兴起的碳纤维复合材料快速成型工艺,较传统的成型工艺在保证制品力学性能的前提下,其复合材料部件生产周期可缩短至10 min以内,大幅缩短了复合材料部件制造周期,成为汽车领域复合材料成型的首选工艺之一。针对HP-RTM工艺用快速固化环氧树脂体系(RX-1),采用DSC(差示扫描量热仪)和流变仪研究了其固化反应热行为和流变行为,并根据经典动力学模型Kissinger法研究RX-1树脂体系固化反应动力学,计算了反应活化能Ea。研究结果表明:RX-1树脂体系在120℃、60 s内其黏度已突增到1.76×10^6Pa·s,完全实现凝胶化,该体系在一定的工艺温度下能实现在2 min内完成固化,利用Kissinger法求得RX-1树脂固化过程表观活化能Ea为54.88 kJ/mol。研究成果为HP-RTM成型工艺参数设定与优化提供了技术基础和理论依据。

HP-RTM(High Pressure-Resin Transfer Molding)is the processing of carbon fiber composite material molding technology for the automotive industry in recent years.Compared with the traditional molding process,HP-RTM could reduce the composite parts production cycle to less than 10min under the premise of ensuring the mechanical properties.Significantly shorten the manufacturing cycle of composite parts.Therefore HP-RTM became one of the preferred composite molding technologies in the automotive field.The curing thermal and rheological behaviors of rapid curing resin system of HP-RTM were studied by DSC(Differential Scanning Calorimeter)and rheometer.The curing kinetics of the RX-1 resin system was studied by the classical dynamic model Kissinger method,and the reaction activation energy Ea was calculated.The result shows that the viscosity increased rapidly to 1.76×10^6 Pa·s and geled completely within 60 s at 120℃,the resin system can be cured within 2 min at certain temperature.the reaction activation energy Ea calculated by the classical dynamic model Kissinger method was 54.88 kJ/mol.The research conclusion offer the theory basis and technology foundation for the parameter set and optimization of HP-RTM molding process.