Phenolic Molding Compound Filled with Nonmetals of Waste PCBs

Abstract

Nonmetals reclaimed from waste phenolic cellulose paper printed circuit boards (PCBs) are used to replace wood flour in the production of phenolic molding compound (PMC). The results indicate that filling of nonmetals in PMC improves the charpy notched impact strength and heat deflection temperature (HDT) and reduces flexural strength and rasching fluidity. Rasching fluidity decreases dramatically with the increase of the content of nonmetals. To ensure sufficient properties of PMC, the optimal added content of nonmetals is 20 wt %, which results in a flexural strength of 70 MPa, a charpy notched impact strength of 2.4 KJ/m2, a HDT of 168 degrees C, a dielectric strength of 3.9 MV/m, and a rasching fluidity of 103 mm, all of which meet the national standard data. When the added content of nonmetals is 20%, the charpy notched impact strength, HDT, and rasching fluidity of PMC decrease, and the flexural and dielectric strengths decrease at first and then increase with decreasing particle sizes. All the results indicate that making PMC with nonmetals of waste PCBs can resolve environmental pollution, reuse nonmetals in different fields, and provide a new method for resource utilization of nonmetals from waste PCBs.

Waste Printed Circuit Boards recycling: an extensive assessment of current status

“…Hong and Su (1996) used nonmetals as reinforcing fillers in the polyester composite. Non-metals recovered from paper-based waste PCBs can also replace wood-flour in the production of wood plastic (polyethylene) composites (Guo et al, 2007). In an analogy, PCB non-metallic fraction as reinforcing fillers in polypropylene (PP) modified by a silane coupling agent could be successfully added as a substitute for traditional fillers (Yokoyama and Iji, 1995).…”

A Plate Produced by Nonmetallic Materials of Pulverized Waste Printed Circuit Boards

“…Then nonmetallic materials were used to produce phenolic molding compound (8). In order to take full advantage of nonmetallic materials of waste PCBs, a novel technique has been developed to recycle the nonmetallic materials of waste PCBs in this study.…”

PVC-based composite material containing recycled non-metallic printed circuit board (PCB) powders

“…(Li et al, 2005), are paper based. It was reported that paper-based NMPCB was used as a substitute for wood powders as fillers for phenolic resins (Guo et al, 2008a). It is noted that, in this cited study, the bending strength and flowability of the composite material worsened.…”