Study on the curing characteristics of medium temperature cured epoxy resin system under different accelerator conditions
Regarding the medium temperature cured epoxy resin system for carbon fiber prepreg,this paper studies the curing characteristics of medium temperature epoxy resin systems under three different accelerator conditions with the flat plate drawing method,differential scanning calorimeter(DSC)and rheometer.The addition of three types of accelerators can significantly improve the reactivity of the dicyandiamide(DICY)epoxy resin system and accelerate the curing speed.U500 accelerator has a good promoting effect either at high temperature of 150℃or at low temperature from 100 to 120℃,and the DSC exothermic peak is sharp,with the characteristic of concentrated heat release.Relatively speaking,accelerator PN23 has the characteristics of low temperature stability and high temperature promotion of activity,and its exothermic peak is short and fat,which helps to reduce concentrated exothermic phenomenon.Its minimum viscosity is high,making it suitable for the preparation of zero absorption resin system.
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