Preparation and performance of composites using waste polypropylene and waste non-metallic powder recycled from printed circuit board

The extrusion molding method was used to prepare WPP/WPCBN composites from waste polypropylene (WPP) and non-metallic powder recycled from waste printed circuit boards (WPCBN). The effects of the composites on flame retardant and mechanical properties were investigated. The mechanism of improvement of WPP/WPCBN interface compatibility and mechanical properties by KH550 and MAPP were investigated using infrared spectroscopy and scanning electron microscopy to analyze the structure of WPCBN before and after modification and impact fracture morphology. The composites were self-extinguishing when the content of WPCBN was greater than 10 phr. The interface bonding strength between WPP and WPCBN was improved after modification by 1.5 phr KH550, and tensile strength, flexural strength and impact strength increased by 6.5%, 6.25%, and 17.9% respectively. When mass ratio of WPP to WPCBN, and to MAPP was 100/30/9, the maximum increments of tensile and flexural strengths were 37.5% and 48.8%, respectively. Compared with new polypropylene (NPP)/WPCBN composites, tensile and flexural strengths of WPP/WPCBN were only less by 16.8% and 20.4%. © All Rights Reserved.