Development and Properties of Polypropylene/Polyethylene Vinyl Acetate/Micro-Cellulose Composite for Polishing Materials Application in Thailand's Jewelry Industry
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Abstract
This research investigates the development of composite material properties from polypropylene (PP) polyethylene vinyl acetate (EVA) and micro-cellulose to be applied as jewelry polishing materials (Plastic Polishing Media). The composite was mixed by a twin-screw extruder (TSE): PP with 30 parts polyethylene vinyl acetate (EVA) parts per hundred resin (phr) and cellulose ratios of 5, 10, 20, and 30 phr, respectively. Each composite compound formulation was injected into the new mold design (a two-sided triangular pyramid shape) created to increase polishing efficiency. It has been found that this geometry can polish complex workpieces. The corners of this geometry can go into more deep nooks or grooves. Reduces polishing time. The physical, mechanical, chemical and thermal properties were then tested. Results were that micro-cellulose as a reinforcing agent in composite materials had good formulation dispersibility and at the 30 phr ratio of micro-cellulose, it was more dispersed throughout the matrix. This gives the polishing materials a more uniform surface and a perfect shape than other formulations. Adding polyethylene vinyl acetate improved cellulose dispersion, reducing the probability of connective gaps between polypropylene and micro-cellulose. In this way, material properties avoided water or oil absorption and featured strength with a high thermal decomposition temperature, all suitable properties for application as jewelry polishing materials. In addition, they were environmentally friendly. Abrasive material properties were tested by machine polishing jewelry (Mass Finishing). The results of the polishing experiment showed that formulas with micro-cellulose content of 30 phr produced significantly different polishing results from other formulations. The surface of the brass workpiece is finer and brighter, Stains are almost completely removed.
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