Effect of ammonium polyphosphate and fillers on flame retardant and mechanical properties of recycled PET injection molded

Abstract

Ammonium polyphosphate (APP) and inorganic fillers were applied for improving flame retardancy and mechanical performance of recycled poly(ethylene terephthalate) (RPET). RPET was compounded with 5-10 wt% of talc and glass bead using twin screw extruder then were injection molded with 2 wt% of APP. The effects of fillers contents and APP on properties and flame retardancy of RPET composites were investigated. The incorporation of talc and glass bead as well as the adding of APP significantly improved tensile and flexural modulus of RPET composites. Scanning electron microscope micrographs indicated good distribution of talc, while glass bead was agglomerated on the RPET matrix. Flame-retardant property of neat RPET and the RPET composites revealed V-2 of UL-94 flammability rating. It can be noted that the composites were less dripping because of the synergistic effect of adding talc and glass bead with APP. From thermogravimetric analysis results, larger of residual char contents and lower values of the activation energy were considered for enhancing flame retardancy in the RPET composites.

Development of Flame-Retarded Nanocomposites from Recycled PET Bottles for the Electronics Industry

“…Nevertheless, there is always an opportunity to improve these properties, e.g., by using fiber reinforcement, blending with other polymers or adding some extra additives [7,8,9,10]. Quality improvement could be achieved in other aspects of the polymer as well, such as by increasing its fire retardancy [11,12,13] and thus open the possibility for new applications, such as in electrical and electronic products.…”

Thermal, thermomechanical and structural properties of recycled polyethylene terephthalate (rPET)/waste marble dust composites

“…The authors claimed that within a certain temperature range of 430.26–431.10 ± 0.82 °C, the ash content of the composites showed a rise as the CaCO 3 loadings rose. Thumsorn et al [ 53 , 54 ] and Chowreddy et al [ 55 ] also found comparable outcomes regarding the thermal stability and heightened ash content of rPET composites when reinforced with CaCO 3 particles, hybrid ammonium polyphosphate/talc/glass beads, and carbon nanotubes. Prior studies have shown that the addition of marble particles to other polymeric matrices, such as polypropylene [ 56 ] and epoxy [ 57 ], enhances the thermal stability and ash content of the resultant composites.…”

The Key to Solving Plastic Packaging Wastes: Design for Recycling and Recycling Technology

“…The mechanical properties of recycled PP composites largely depend on the changing length of glass fibers during the injection molding process, and the prepared recycled PP composites were successfully used for producing new automotive components. Thumsorn et al [ 117 ] reported that the addition of ammonium polyphosphate (APP) and inorganic fillers significantly improved the flame retardancy and mechanical performance of recycled PET due to the synergistic effect of talc, glass beads, and APP. Besides, carbon nanotubes (CNTs) provide good reinforcement for recycled PET [ 118 ].…”