| The unsaturated polyester resins(referred UPR) was cured with redox initiator system, which made UPR have low curing temperature and good curing properties and the products which were made of UPR have a wide range of applications in the automotive,construction, decoration and other industries. But there were still some problems, such as redox initiator system was affected greatly by ambient temperature when UPR curing effects UPR by large, multi-component initiator had action of triggering double bond polymerize but poor storage stability, The current formula didn’t not meet the UPR curing requirements about having a long the construction period and fast curing that had an impact on the performance of UPR, etc.. In this paper, these issues were discussed, which has some reference value on the application of UPR.First of all, the redox initiator system which little affected by temperature when UPR curing was carried out with experimental exploration. Firstly, it was obtained that the appropriate amount of initiators and accelerators which had little influence on the UPR curing parameters(including gel time, peak time, maximum heat evolution peak temperature) under the same curing temperature by selecting a single initiator- accelerator UPR initiator system for curing 25℃. Then, it was determined that single initiator-accelerator initiator system influence on the UPR curing temperature by measuring UPR curing parameters in different temperatures according to amount of each component.Finally, the suitable amount of each component which had little influence on the UPR curing temperature was obtained by selecting the appropriate initiator compounded with other additives, which optimized the sensitivity of the redox initiator system to temperature.Secondly, the storage stability about multicomponent initiator was studied. In this study, the suitable stabilizers were chosen by researching factors about storage stability of initiators, and whose appropriate dosage and conditions of use were determined by combining combination active oxygen content, decomposition rate and trigger activity of the multicomponent initiator.Finally, the construction period and curing properties of UPR were studied at room temperature. UPR was cured with Ketone peroxide / cobalt ethylhexanoate /2,4-pentanedione / hydroquinone initiator system and benzoyl peroxide initiator / N, Ndimethylaniline / N- methyl-N-2- hydroxyethyl p-toluidine initiator systems respectively,and the different amount of each component on the influence of UPR curing, whereby the appropriate amount of it was obtained, which achieved the goal that made UPR have a long construction period, the faster cure speed, and a higher degree of cure during the curing process.The appropriate amount of each component was obtained in this paper by studying different initiators and additives influence on the UPR curing, which optimized the sensitivity of the redox initiator system to temperature, achieved the goal that made UPR have a long construction period, the faster cure speed, and a higher degree of cure during the curing process, and solved the problem of UPR curing parameters affected because of poor storage stability when initiators combination. |
