几种聚脲体系的固化反应动力学研究

Studyon Curing Kinetics of Several Polyurea Systems

采用非等温差示扫描量热(DSC)法研究了不同升温速率下F524树脂、F520树脂、W-a树脂、W-b树脂以及W-a/W-b混合树脂与HDI三聚体的固化反应过程,通过模拟n级反应动力学模型,采用Kissinger方程和Crane方程计算出各聚脲体系固化反应的动力学参数,对比研究了各单一树脂体系以及混合树脂体系的固化反应影响规律。研究发现:4种单一树脂体系的固化反应活性及反应速率与树脂体系的分子量有关,树脂体系分子量越小,反应活性越高,将不同分子量树脂混合后的树脂体系,其固化反应活性及反应速率相较于单一树脂更高。

The curing reactions of F524 resin,F520 resin,W-a resin,W-b resin and W-a/W-b hybrid resin with HDI trimer were investigated by non-isothermal Differential Scanning Calorimetry(DSC)method at different heating rates.The kinetic pa-rameters of the curing reaction of each polyurea system were calculated by simulating the n-level reaction kinetic model using Kissinger's equation and Crane's equation,and the influence of the curing reaction of each single resin system and the hybrid resin system was studied comparatively.It was found that the curing reactivity and reaction rate of the four single resin systems were related to the molecular weight of the resin system,the smaller the molecular weight of the resin system,the higher the re-activity,and the curing reactivity and reaction rate of the resin system after mixing different molecular weight resins were higher compared with that of the single resin.