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

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 3140-3144
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.3140
• Online since: November 2011
• Authors: Lin Zhuan Ma, Hua Wang, Shan Qing, Lin Zhuan Ma
• Keywords: Epoxy Resin (ER), Extracting, Recycling, Solvent, Waste Printed Circuit Board (WPCB)

References

[1] jiuyong Guo, jie Guo, Zhenming Xu. Recycling of non-metallic fractions from waste printed circuit boards: A review. Journal of Hazardous Materials. 168(2009): 567-590.

DOI: 10.1016/j.jhazmat.2009.02.104

[2] Jae-Min Yoo, Jinki Jeong, Jae-chun Lee . Enrichment of the metallic components from waste printed circuit boards by a mechanical separation process using a stamp mill. Waste Management. 29 (2009) 1132–1137.

DOI: 10.1016/j.wasman.2008.06.035

[3] Guan Hua Xing, Janet Kit Yan Chan, Anna Oi Wah Leung, Sheng Chun Wu. Environmental impact and human exposure to PBCs in Guiyu, an electronic waste recycling site in China. Environment International. 35(2009)76-82.

DOI: 10.1016/j.envint.2008.07.025

[4] Cheng Guofeng, Lu Shuyu, Luo Lijuan. Reutilization technology of reclaiming epoxy resin from waste printed circuit boards. Renewalble resources and recycling economy. 2008, 1(9), 30-33.

[5] B.Y. Wu, Y.C. Chan, A. Middendorf, X. Gu, H.W. Zhong. Assessment of toxicity potential of metallic elements in discarded electronics: A case study of mobile phones in China. Journal of Environmental Sciences 20(2008) 1403-1408.

DOI: 10.1016/s1001-0742(08)62240-8

[6] Wu Jiang, Li Jia, Xu Zhen-ming. A new two-roll electrostatic separator for recycling of metals and nonmetals from waste printed circuit board. Journal of Hazardous Materials. 161(2009)257-262.

DOI: 10.1016/j.jhazmat.2008.03.088

[7] Zhou Cuihong, Lu Maixi. Study on major components and liberation characteristics. Techniques and Equipment for Environmental Pollution control. 2005, 4(4), 28-31.

[8] Masatoshi Kubouchi, Weirong Dand, Hideki sembokuya. Studies on Recycling of Bisphenol Epoxy Resin cured with Amine. Fiber Composites. 2002, 1(19), 58-60.

[9] Zhuang Yan, Lu Wenxiong, Li Xiaoliang, Zhou Haiwen. Recovering and Reusing Ways for Abandoned Printed Circuit Boards Nonmetals. Shanghai Chemical Industry. 2008, 6(33), 1-5.