Study On The Application Of Ground Rubber Tyre And PCB Improving Toughness And Strength Of PVC Composites

In this thesis, polyvinyl chloride(PVC) was blended with ground rubber tyre(GRT) or nonmetals recycled from waste printed circuit boards(N-PCB) to prepare PVC/GRT、PVC/N-PCB、PVC/GRT/N-PCB by the twin-screw extrusion method. The toughening efficiency of GRT and the strengthening efficiency of N-PCB were studied.Reactive monomers including glycidyl methacrylate(GMA), acrylic acid(AA) and maleic anhydride(MAH) were grafted onto ground rubber tyre(GRT) to prepare the PVC/GRT composites by directly reactive extrusion, and the mechanical properties of PVC/GRT composites was evaluated. The results showed that notched impact strength was improved by 26% in PVC/GRT-g-GMA composites at GRT loading of 5phr and the GMA/St/DCP ratio of 4/4/0.15.The Contact angle and the scanning electron microscope(SEM) results showed that GMA could improve the compatibility between PVC and GRT.N-PCB was applied in the preparation of PVC/N-PCB composites,by melt blending. The effects of loading of N-PCB, loading of E-44 and N-PCB particle sizes on the mechanical properties of PVC/N-PCB composites were investigated. The results showed that the tensile strength,elongation at break, bending strength were improved by 18%、29% and20%, respectively, at the N-PCB loading of 30 phr and E-44 loading of5 phr, comparing to that of pure PVC. The tensile strength, elongation at break, bending strength are improved by 12% 、 26% and 19%,respectively, comparing to that without E-44.The scanning electron microscope(SEM) results showed that E-44 could improve the interface between PVC and N-PCB.The results indicated that the notched impact strength of PVC/GRTcomposites were improved while the tensile strength, elongation at break,bending strength of PVC/N-PCB composites were improved compared to pure PVC. GRT and N-PCB were applied in the preparation of PVC/GRT/N-PCB composites all at once by reaction extrusion. The results showed that the tensile strength, elongation at break, bending strength, and notched impact strength were improved by 7%、44% 、12%and 19%, respectively, at the GRT-g-GMA loading of 5phr、the N-PCB loading of 30 phr and E-44 loading of 10 phr, comparing to that pure PVC.All the results indicated that the compatibility between GRT or N-PCB and polymers could effectively improve by chemical reaction, It is the new way to use GRT and N-PCB as a composite filler, and it has a certain economic and social value.