College of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai 200444, People's Republic of China.
Waste Manag. 2012 Oct;32(10):1914-8. doi: 10.1016/j.wasman.2012.05.025. Epub 2012 Jun 8.
Recycling of waste printed circuit boards (WPCBs) is an important subject not only for the protection of environment but also for the recovery of valuable materials. A feasibility study was conducted to dissolve bromine epoxy resins of WPCBs using ionic liquid (IL) of 1-ethyl-3-methylimizadolium tetrafluoroborate [EMIM(+)][BF(4)(-)] (nonaqueous green solvent) for recovering copper foils and glass fibers. Experimental results indicated that the initial delamination had seen from the cross-section of the WPCBs by mean of metallographic microscope and digital camera when WPCBs were heated in [EMIM(+)][BF(4)(-)] at 240°C for a duration of 30 min. When temperature was increased to 260°C for a duration of 10 min, the bromine epoxy resins of WPCBs were throughout dissolved into [EMIM(+)][BF(4)(-)] and the separations of copper foils and glass fibers from WPCBs were completed. This clean and non-polluting technology offers a new way to recycle valuable materials from WPCBs and prevent the environmental pollution of WPCBs effectively.
废弃印刷电路板 (WPCB) 的回收不仅是环境保护的重要课题，也是有价值材料回收的重要课题。本研究采用离子液体 1-乙基-3-甲基咪唑四氟硼酸盐 ([EMIM(+)][BF(4)(-)])（环保绿色溶剂）对 WPCB 中的溴化环氧树脂进行溶解，以回收铜箔和玻璃纤维，对其进行了可行性研究。实验结果表明，当 WPCB 在 240°C 下加热 30 分钟时，通过金相显微镜和数码相机可以观察到 WPCB 横截面开始分层。当温度升高至 260°C 并持续 10 分钟时，WPCB 中的溴化环氧树脂完全溶解于 [EMIM(+)][BF(4)(-)]中，WPCB 中的铜箔和玻璃纤维完全分离。这种清洁无污染的技术为从 WPCB 中回收有价值的材料提供了一种新方法，有效地防止了 WPCB 的环境污染。
