The use of Fly ash as a cheap filler medium in order to cut the production cost of the Unplasticized polyvinyl chloride (rigid) pipes, though maintaining the strength and the finishing quality
Keywords:
PVC industry, fillers, CaCO3 mineral, starch, fly ashAbstract
Polyvinyl chloride (PVC) resin is polymerized to produce different shapes of plastic materials. Unplasticized Polyvinyl chloride (UPVC) polymer is a rigid plastic of a daily use. In Pakistan, UPVC plastics pipes are commonly used as a sewer and clean water carrying pipes. Besides the PVC resins, the pipe making industry uses a known percentage of calcium carbonate (CaCO3) mineral as a filler medium. The weight (or specific gravity) of the pipes increases when the amount of CaCO3 increases from 8 parts per hundred rubber (PHR), and also the formed pipes may not withstand the desired design load. Moreover, the rheology of the polymerized mixture becomes complicated in presence of inorganics. In this study our main objective was to propose an alternative cheap lightweight filler, and to improve the smoothness of produced pipes. We propose that instead of using CaCO3 mineral, a mixer of starch and fly ash fillers will have relatively less weight, and has much better overall strength values. Moreover, polyethylene wax (lubricant) should be an ingredient to recover the overall finishing quality of the pipe. Very importantly, no design changes are needed for the adaptation of the proposed filler compositional change.
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