scholarly journals Polypropylene Composites Reinforced by Nonmetallic from Waste Printed Circuit Boards Using Spout-Fluid Bed Coating with PP Particles Enhance Fluidization

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3106
Author(s):  
Man Wu ◽  
Jingxia Jiang ◽  
Cuiping Meng ◽  
Xiude Hu ◽  
Henglai Xie ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Polypropylene Composites ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Fluid Bed ◽  
Coating Methods ◽  
Ft Ir ◽  
Fluid Bed Coating

Nonmetallic materials recycled from waste printed circuit boards (N-WPCBs) were modified by coating KH-550 in a spout-fluid bed. To improve the effect of the modification, PP particles were used to enhance the fluidization quality of the N-WPCB particles in the coating modification. Then, the modified N-WPCBs were used as fillers to fabricate PP/N-WPCB composites. The method of coating in a spout-fluid bed with PP particles enhanced fluidization and showed the best modification effect compared to other coating methods. The FT-IR and SEM results demonstrated that interfacial bonding between N-WPCBs and PP could be enhanced by modified N-WPCBs, which improved the mechanical properties of the composites. When the mass ratio of PP to N-WPCBs is 100:75 and the dose of KH-550 is 4 phr, the flexural strength, tensile strength, and impact strength of the composites increase by 16.60%, 23.22%, and 23.64%, respectively. This would realize the high-value utilization of N-WPCBs with coating modification in the spout-fluid bed.

Recycling Of the Epoxy Resin of the Waste Printed Circuit Boards Using Solvent Extraction

2011 ◽  
Vol 383-390 ◽  
pp. 3140-3144 ◽  
Author(s):  
Lin Zhuan Ma ◽  
Hua Wang ◽  
Shan Qing ◽  
Lin Zhuan Ma
Keyword(s):  
Solvent Extraction ◽  
Epoxy Resin ◽  
Flame Retardants ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
The Public ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Land Filling

Currently, the number of the waste printed circuit boards (WPCB) is increasing. The technologies of extracting and reclaiming of the value of the metallic fraction of WPCB have been used widely because of the major economic driving force. But the non-metallic fractions (NMFs), which take up almost 70wt% of waste WPCB, were mainly treated by combustion or land filling in the past. However, combustion of the NMFs will cause the formation of highly toxic polybrominated dibenzodioxins and dibenxofurans (PBDD/Fs). Land filling of the NMFs will lead to secondly pollution that caused by heavy meatals and brominated flame retardants (BFRs) leaching to the groundwater. Therefore, recycling of the NMFs from waste PCBs is drawing more and more attention from the public and the governments. How to recycle the NMFs environmental soundly has become a significant topic in recycling of WPCB. This paper briefly introduced that the damage of WPCB and the recycling methods of epoxy resin. The method was established for recycling of WPCB by using solvent extraction. And the optimal conditions were attained through experiments: the reaction temperature was 80°C、the reaction time was 3h、the concentration of nitrate acid was 8 mol/l, the amount of nitrate acid : the quality of WPCB was 50ml/10g.

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