Research On The Deep Reclamation Of Nonmetallic Material From Waste Printed Circuit Board

In recent years, the rapid growth of e-waste resulted in huge generation of waste printed circuit board (WPCB), while the complex composition, high pollutants content and disposal difficulty made the nonmetallic material of WPCB the aporia of e-waste disposal. In this thesis, the nonmetallic powder of WPCB were characterized, and it was used as filler to prepare polypropylene (PP) and acrylonitrile-butadiene-styrene copolymer (ABS) resin based composites. Furthermore, the technology process and products quality of recovered rainwater gate were analyzed. In addition, the research explored the feasibility of preparation wood-plastic composite (WPC), unburned brick and cement based foam insulation board with nonmetallic powder.The nonmetallic powder were comprised of thermosetting resin (phenolic or epoxy resins) that accounts for more than60wt%and inorganic component, as well as trace metals. While the recovered products made by coarse particle sized nonmetallic powder had roughness surface, and can only be used in the production of water grate, manhole covers and other product which had less requirement on the appearance. The mass loss of nonmetallic powder at the temperature of250℃was about2.5wt%, and the higher temperature, the rapid heat loss of it.The particle size had less impact on the recovered composite material made of the mechanical properties, while the strength of composite material filled with nonmetallic powder decreased and the stiffness increased. When the quantity of nonmetallic powder filled in the PP/ABS resin based composite material was20wt%, the tensile, bending and impact strength decreased by11.1%and17.3%,5.1%and9.3%,50%and75%, respectively, and the tensile and flexural modulus increased by21.2%and29.5%,39.0%and19.1%, respectively. The leaching toxic of recovered thermoplastic resin based composite material satisfy the environmental safety requirement.The production efficiency and secondary pollution control of rainwater gate which made of nonmetallic powder by pressing molding could be improved by processes optimizing. At the same time, when the material ration of recycled PP (RPP), recycled polyurethane(RPU) and nonmetallic powder was2:1:2, the recovered rainwater gate had smooth appearance, neatly arranged filler inside and the load-carrying capacity of3MPa. The product quality of recovered wood-plastic material were easily effected by the preparation process parameters, and the product was difficult to prepare. Whilst the preparation of unburned brick and cement based foam insulation board were not so complicate. When the WPC was made of nonmetallic powder, polyvinyl chloride (PVC), poplar powder with the material ratio of2:2:1, and unburned brick was made of nonmetallic powder, cement, sand with the material ratio of3:3:4and no additional agents, as well as the cement based insulation board was made of non-metallic powder, RPU, foaming ingredient with the ratio of7.5:4.5:48:2, recovered product quality meet related product standards.In summary, nonmetallic powder of WPCB were successfully used to prepare rainwater grate, wood-plastic material, unburned brick and cement based foam insulation board, which effectively relieved the environmental impact of open burning and landfill, and achieved high valued recycling of nonmetallic materials from WPCB.