Pyrolysis-Based Material Recovery from Molding Resin for Electronic Parts
Publication: Journal of Environmental Engineering
Volume 124, Issue 9
Abstract
Pyrolysis-based technology for the epoxy resin compounds (molding resin) used for molding electronic components has been studied for the purpose of recovering useful materials and reusing them. The molding resin contains silica filler (70–85% by weight) and flame retardant consisting of bromine compounds and antimony oxides. This study has clarified those pyrolysis conditions best suited to reduction of the impurities (carbon, antimony, and ionic substances) in the recovered silica filler. This has contributed to the development of a practical pyrolysis technology in which a roller kiln-type furnace is used to recover high-purity silica filler. The recovered silica was sufficiently pure to be employed as an inorganic filler in epoxy resin compounds to be used as cast-insulating materials and original molding resins. The combustion exhaust gas generated in the pyrolysis of the molding resin has been successfully treated by a secondary combustion method that decomposed organic bromine compounds in the gas to a safe level, and it converted antimony bromides to antimony oxides, which could then be collected by a dry recovery process at a useful purity.
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References
1.
Bhaia, J., and Rossi, R. A.(1982). “Pyrolysis process converts waste polymers to fuel oil.”Chem. Eng., 89(20), 58–59.
2.
Bouvier, J. M., Tremblay, E. D., and Gelus, M.(1987). “Managing fiberglass-reinforced polyester composite wastes.”Resour. and Conservation, 15, 299–308.
3.
Camino, G., and Costa, L.(1988). “Performance and mechanisms of fire retardants in polymers.”Polymer Degradation and Stability, 20, 271–294.
4.
Creasy, W. R.(1992). “Epoxy resin analysis by Fourier transform mass spectrometry: A comparison of pyrolysis and laser ablation.”Polymer, 33(21), 4486–4493.
5.
Dale, J. R., and Oldfield, R. C.(1977). “Mechanical stress likely to be encountered in manufacture and use of plastically encapsulated devices.”Microelectronics Reliability, 16, 255.
6.
Eighmy, T., and Kosson, S. (1996). “U.S.A. national overview on waste management.”Proc., Seminar on Cycle and Stabilization Technologies of MSW Incineration Residue, Int. Ash Working Group/Japan Waste Res. Found., Kyoto, Japan, 235–249.
7.
Fiedler, H.(1993). “Formation and sources of PCDDs/PCDF.”Organohalogen Compounds, 11, 221–228.
8.
Gale, P. J.(1990). “Mass spectrometric studies of the reactivity of antimony trioxide with halogenated flame retardants in the pyrolysis of plastics.”Int. J. of Mass Spectrometry and Ion Processes, 100, 131–332.
9.
Golunski, S. E., Nevell, T. G., and Pope, M. I.(1981). “Thermal stability and phase transitions of the oxides of antimony.”Thermochemica. Acta., 51, 153–168.
10.
Hastie, J. W.(1973). “Mass spectrometric studies of flame inhibition: Analysis of antimony trihalides in flames.”Combustion and Flame, 21, 49–54.
11.
Iijima, R.(1990). “Current situation of waste plastics recycling technologies and their prospects.”Engrg. Plast., 3(5), 332–350.
12.
Imai, Y., and Kawashima, C. (1960). Heat resistant materials handbook. Asakura Publishing Co., Tokyo, Japan, p. 705.
13.
Liem, D., and van Zorge, J.(1995). “Dioxins and related compounds: Status and regulatory aspects.”Envir. Sci. & Pollut. Res., 2(1), 46–56.
14.
Roaper, R. B., and Bhatia, J. (1981). “Conversion of waste plastics to fuel oil. Final report for the period September 18, 1979 to October 31, 1981.”Rep. No. DOE-CS-40076-T-1, U.S. Dept. of Energy.
15.
Safe, S., and Phil, D.(1990). “Polychlorinated biphenyls, dibenzo-o-dioxins, dibenzofurans, and related compounds: Environmental and mechanistic consideration which support the development of toxic equivalency factors.”Critical Rev. in Toxicology, 21, 51–88.
16.
Satake, Y., Uddin, M. A., Koizumi, K., and Murata, K.(1996). “Catalytic degradation of polypropylene into liquid hydrocarbons using silica-alumina catalyst.”Chem. Lett., 3, 245–246.
17.
Sawell, S., Hetherington, S., and Chandler, J. (1996). “An overview of municipal solid waste in Canada.”Proc., Seminar on Cycle and Stabilization Technologies of MSW Incineration Residue, Int. Ash Working Group/Japan Waste Res. Found., Kyoto, Japan, 250–263.
18.
Teller, V. M.(1994). “Thermal treatment of electronic waste.”Galvanotechnik, 85(2), 550–555.
19.
Vehlow, J., Karlsruhe, F., and Mark, F. E. (1997). Electrical and electronic plastics waste co-combustion with municipal solid waste for energy recovery. Assn. of Plastics Manufactures in Europe, Brussels, Belgium.
20.
Walker, R. N.(1994). “Foundry reclaims silica electrically.”Foundry Mgmt. Technol., 122(3), 30–32.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 124 • Issue 9 • September 1998
Pages: 821 - 828
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Sep 1, 1998
Published in print: Sep 1998
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