各类废弃印刷线路板非金属材料回收研究

Study on Recycling of Non-metal Materials of Different Types of Waste Printed Circuit Boards

废弃印刷电路板(Printed Circuit Boards,简称PCBs)非金属粉末中热固性环氧树脂在热的无机酸中能完全分解成环氧树脂和玻璃纤维。选择了七种不同型号的废弃PCBs非金属粉末作为研究对象,研究了这些非金属粉末中金属残留物的含量以及玻璃纤维的含量。结果显示,在非金属粉末中含有一定量的金属残留物。在七种不同型号的废弃PCBs非金属粉末中,玻璃纤维的含量也不一样,在纸基线路板中玻璃纤维含量较小,甚至不含玻璃纤维。还研究了环氧树脂回收量与分解时间的关系,并分别用SEM和FTIR表征回收的玻璃纤维和环氧树脂。

The thermosetting epoxy resin contained in the non-metal powders of waste printed circuit boards could be decomposed in nitric acid.Seven types of non-metal powders of waste printed circuit boards were selected to measure the metal contents and glass fibers contents.The results revealed that the non-metal powders contained a small amount of metal residues and that the contents of glass fibers in seven types of PCBs non-metal powders were also different.Little glass fibers or no glass fibers were found in the paper-based PCBs.The relationship between the yields of recovered epoxy resins and reaction time was discussed.SEM and FT-IR were employed to characterize the recovering epoxy resins and glass fibers.