Abstract: In order to solve the problem about the curing speed slow with the extension of gel time in the cure reaction of the unsaturated polyester resin (UPR), the UPR was cured with redox curing system which consisted of methyl ethyl ketone peroxide, cyclohexanone peroxide, cobalt bitter and 2,4-pentanedione at room temperature in this paper, hydroquinone was regarded as an additive at the same time. The amount of each component in the redox curing system on the influence of UPR gel time, peak time and exothermic peak temperature were studied, whereby the most suitable dosage of each component which including methyl ethyl ketone peroxide, cyclohexanone peroxide, cobalt bitter, 2,4-pentanedione and hydroquinone was obtained. And, UPR has long induction period, fasted curing in the late, and cure degree high when applying this technology condition which got through the experiment in the engineering application.

Key words: unsaturated polyester resin, methyl ethyl ketone peroxide, cyclohexanone peroxide, cobalt bitter, gel time