| Compared to existing physical method for the treatment of waste printed circuit board (WPCB), vacuum pyro lysis has the advantages of separating and recycling of all the components (metal, organic polymer resin, inorganic glass fiber), thus, it is considered to be the most promising treatment method. But current vacuum pyro lysis researches are more about the recycle of metal, but less about glass fiber (GF). This research focus on the recycle of GF from pyro lysis residue.To begin with, pyrolyzing WPCB under vacuum in a self-made batch pilot-scale fixed bed reactor, and separating the GF from the pyrolysis residues. Researches include the effect of pyro lysis conditions on pyrolysis results, the effect of crushing conditions on size crushing product, and the effect of separating conditions on purification. Optimal pyrolysis technology parameters, crushing conditions, calcining conditions and separating conditions were determined. GF was obtained at last.Secondly, fill polypropylene (PP) matrix composites with GF recycled from WPCB, the effect of injection molding process conditions, the content of polypropylene grafted with maleic anhydride, the content of GF and the length of GF were researched in detail. Compared to pure PP, the increment of tensile strength, flexural strength and impact strength is 46%,65% and 82% respectively, and the Vicat Softening Temprature (VST) is increased by 3.2℃under the optimum conditions.Finally, the fracture surface of GF/PP was observed by mean of scanning electron microscope, the melt index was tested by molten index tester to study the meltfluid vary with the content of GF, and the crystallization of GF/PP changes was characterized by differential scanning caborimetry.The results of the study show that it is feasible to fill PP matrix composites with GF recycled from WPCB, and the property of PP will be enhanced markedly by GF. |
