Preparation of fine fiberglass‐resin powders from waste printed circuit boards by different milling methods for reinforcing polypropylene composites

Abstract

In this study, different milling methods were used to prepare fine fiberglass‐resin powders (FRP) from waste printed circuit boards for the sake of obtaining high‐performance polypropylene (PP)/FRP composite. The processability and appearance of composites can be greatly improved through further milling of FRP; smaller average particle size and narrower particle size distribution can be obtained by pan milling as compared with jet milling and planetary ball milling. Mechanical test results showed that fine FRP prepared by pan milling could be used as reinforcing fillers in the PP composites and possessed better mechanical properties than other two milling methods. The mechanical properties was also confirmed by scanning electron microscopy studies which indicated that the dispersion of FRP and interfacial adhesion between fiberglass and PP matrix was much better by pan milling. Meanwhile, the heterogeneous nucleation effect of FRP by pan milling was more obvious. The above results indicate that solid‐state shear is a new method for producing fine FRP and high‐performance PP composites filled with FRP. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42494.

Separation and purification of metal and fiberglass extracted from waste printed circuit boards using milling and dissolution techniques

“…As illustrated, the weight of recovered metal varied; it was 0.65- 0.93 g (28 wt % of the total WPCB mass), whereas the weight of recovered fiberglass was 1.63-2.15 g (64 wt % of the total WPCB mass). These results agree with results reported in the recent literature [39,40]. Thus, average recovery rate was 92% (based on the mass balance).…”

Structure and performance of Poly(vinyl alcohol)/wood powder composite prepared by thermal processing and solid state shear milling technology

“…S 3 M reactor is a polymer mechanochemical equipment designed by our group, the unique pan milling groove is a core structure, which can provide a strong threedimensional shear force and significantly promote the effects of pulverization, dispersion, mixing, mechanical activation and reaction [18,19]. Yang et al compared the solid-state shear milling with jet milling and planetary ball milling, and the results showed that S 3 M had better effects of dispersion, pulverization and reinforcement [20]. Therefore, S 3 M technology will also be an effective way to improve the dispersion and interaction between wood powder and PVA.…”

Reutilization of waste printed circuit boards nonmetallic powders in elastomer composites: Significant improvements of curing and mechanical properties

“…However, the sustainable reuse of WPCBP remains a daunting challenge, and most of the WPCBP are incinerated or landfilled without any effective high‐valued reutilization, which causes serious resource waste and irreversible environmental pollution . Until now, a more eco‐friendly and profitable method which the WPCBP was used as reinforcing fillers in polymer matrix, such as polyester, phenolic resin, polypropylene, poly (vinyl chloride), and polyethylene, has been proposed previously. These pioneering researches mainly focused on the reinforcement of glass fiber in plastic composites.…”