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W. Nowaczek


Polyester molding compounds made with thermosetting resin recyclates

Polimery 1999, No 11-12, 758


DOI: dx.doi.org/10.14314/polimery.1999.758


Summary

Three types of recyclates were used, viz., waste polyester molding compound/bulk molding compound articles, glass-reinforced cold-cured polyester laminates scrap, and waste printed-circuit boards made of epoxy-glass copper-coated laminates. Partial replacement of a powdered filler (e.g., chalk) by the recyclates studied, has changed the processing conditions for making polyester molding compounds, their maturation conditions and processing properties, and thus also the final properties of the molds (Table 1). Recyclates raised the viscosity, accelerated the chemical thickening caused by MgO (Fig. 1), and slightly delayed the exothermic peaking of the crosslinking process and lowered the heat of copolymerization. Added in amounts of 10-15 wt.%, the recyclate was found to affect the cured resin so slightly as to allow the properties of engineering materials to be retained.


Keywords: recycling of thermosetting plastics scrap, polyester molds, recyclates as fillers, service properties of cured polyester molds

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