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Title: Curing studies of unsaturated polyester resin used in FRP products
Authors: Waigaonkar, Sachin
Babu, B J C
Rajput, Amit
Keywords: Curing
Gel time
Peak exothermic temperature
Process optimization
Unsaturated polyester
Issue Date: Feb-2011
Publisher: NISCAIR-CSIR, India
Abstract: Fiber reinforced plastics (FRP) products being strong and light in weight, find extensive applications in automobiles, marine, structural and household components. Unsaturated polyester (UP) resin is a principle binder material used in FRP products. Curing of UP resin is a key for successful FRP processing. Gel time (<i style="">t</i><sub>gel</sub>) and peak exothermic temperature (θ<sub>peak</sub>) are critical measures of curing of resin. <i style="">t</i><sub>gel</sub> indicates commencement of polymer cross-linking (setting) while θ<sub>peak</sub> controls shrinkage and cracking of polymer. This paper aims to predict the <i style="">t</i><sub>gel</sub> and θ<sub>peak</sub> during cure of UP resin. The weight percent of methyl ethyl ketone peroxide (MEKP) as catalyst, cobalt octoate (C<sub>oct</sub>) as an accelerator, calcium carbonate (CaCO<sub>3</sub>) as filler and glass fibers as reinforcements are used as process variables. The variations in <i style="">t</i><sub>gel </sub>and<sub> </sub>θ<sub>peak </sub>are approximated by regression equations. Strong interactions are found between the process variables. The process optimization is made to achieve a desired combination of <i style="">t</i><sub>gel</sub> and θ<sub>peak</sub> within the regime of experimentation. Confirmatory experiments are performed to validate the predicted results.
Description: 31-39
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.18(1) [February 2011]

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