Journal of the Korean Wood Science and Technology

  • 제43권5호
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  • Pages.672-681
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  • 2015
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  • 1017-0715(pISSN)
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  • 2233-7180(eISSN)
한국목재공학회 (The Korean Society of Wood Science & Technology)
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Hydrolytic Stability of Cured Urea-Melamine-Formaldehyde Resins Depending on Hydrolysis Conditions and Hardener Types

  • Park, Byung-Dae (Department of Wood and Paper Sciences, Kyungpook National University) ;
  • Lee, Sang-Min (Division of Wood Processing, Korea Forest Research Institute)
  • 투고 : 2015.01.21
  • 심사 : 2015.03.21
  • 발행 : 2015.09.25
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초록

As a part of abating the formaldehyde emission of amino resin-bonded wood-based composite panels, this study was conducted to investigate hydrolytic stability of urea-melamine-formaldehyde (UMF) resin depending on various hydrolysis conditions and hardener types. Commercial UMF resin was cured and ground into a powdered form, and then hydrolyzed with hydrochloric acid. After the acid hydrolysis, the concentration of liberated formaldehyde in the hydrolyzed solution and mass loss of the cured UMF resins were determined to compare their hydrolytic stability. The hydrolysis of cured UMF resin increased with an increase in the acid concentration, time, and temperature and with a decrease in the smaller particle size. An optimum hydrolysis condition for the cured UMF resins was determined as $50^{\circ}C$, 90 minutes, 1.0 M hydrochloric acid and $250{\mu}m$ particle size. Hydrolysis of the UMF resin cured with different hardener types showed different degrees of the hydrolytic stability of cured UMF resins with a descending order of aluminum sulfate, ammonium chloride, and ammonium sulfate. The hydrolytic stability also decreased as the addition level of ammonium chloride increased. These results indicated that hardener types and level also had an impact on the hydrolytic stability of cured UMF resins.

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참고문헌

  1. Clad, W., Schmidt-Hellerau, C. 1977. Particleboards for the building industry: Performance and suitability tests. Proc. of The 11th International Particleboard Symposium, Washington State University, Pullman, WS, pp: 33-61.
  2. Chuang, I.S., Maciel, G.E. 1994. NMR study of the stability of urea-formaldehyde resin components toward hydrolytic treatments. Journal of Applied Polymer Science 52: 1637-1651. https://doi.org/10.1002/app.1994.070521112
  3. Elbert, A.A. 1995. Influence of hardener systems and wood on the formaldehyde emission from urea-formaldehyde resin and particleboard. Holzforschung 49(4): 358-362. https://doi.org/10.1515/hfsg.1995.49.4.358
  4. Gu, J.Y., Higuchi, M., Morita, M., Hse, C.Y. 1995. Synthetic conditions and chemical structures of urea-formaldehyde resins I. Properties of the resins synthesized by three different procedures. Mokkuzai Gakkaishi 41(12): 1115-1121.
  5. Hse, C.Y., Xia, Z.Y., Tomita, B. 1994. Effects of reaction pH on properties and performance of urea-formaldehyde resins. Holzforschung 48: 527-532. https://doi.org/10.1515/hfsg.1994.48.6.527
  6. Kavvouras, P.K., Konniditsiotis, D., Petinarakis, J. 1998. Resistance of cured urea-formaldehyde resins to hydrolysis: A method of evaluation. Holzforschung 52: 105-110. https://doi.org/10.1515/hfsg.1998.52.1.105
  7. Marutzky, R. 1986. Release of formaldehyde by wood products. In: Wood Adhesives: Chemistry and Technology, Vol. 2. Ed. by A. Pizzi. pp: 307-387.
  8. McCaffery, M. 1970. Laboratory Preparations for Macromolecular Chemistry. McGraw Hill, New York, USA. p. 61.
  9. Myers, G.E., Koutsky, K.A. 1987. Procedure for measuring formaldehyde liberation from formaldehyde-based resins. Forest Products Journal 37(9): 55-60.
  10. Myers, G.E. 1986a. Mechanisms of formaldehyde release from bonded wood products. In: Formaldehyde Release from Wood Products, B. Meyer. B. A. K. Andrews, R. M. Reinhardt. Ed., American Chemical Society, pp: 87-106.
  11. Myers, G.E. 1986b. Resin hydrolysis and mechanisms of formaldehyde release from bonded wood products. In: Christiansen AW, Gillespie R, Myers GE, River BH, Eds. Wood Adhesives in 1985: Status and needs. Forest Products Society, Madison, WI. pp: 119-156.
  12. Myers, G.E. 1983. Formaldehyde emission from particleboard and plywood paneling: measurement, mechanism, and products standards. Forest Products Journal 33(5): 27-37.
  13. Myers, G.E., Koutsky, K.A. 1990. Formaldehyde liberation and cure behavior of urea-formaldehyde resins. Holzforschung 44: 117-126. https://doi.org/10.1515/hfsg.1990.44.2.117
  14. Myers, G.E. 1982. Hydrolytic stability of cured urea-formaldehyde resins. Wood Science 15(2): 127-138.
  15. Nessuer, H., Schall, W. 1970. Experiments for the determination of hydrolysis phenomena in particleboards. Holzforschung Holzverwert 22(6): 116-120.
  16. No, B.Y., Kim, M.G. 2004. Syntheses and properties of low-level melamine-modified urea-melamine-formaldehyde resins. Journal of Applied Polymer Science 93: 2559-2569. https://doi.org/10.1002/app.20778
  17. No, B.Y., Kim, M.G. 2005. Curing of low-level melamine-modified urea-melamine-formaldehyde particleboard binder resins studied with dynamic mechanical analysis (DMA). Journal of Applied Polymer Science 97: 377-389. https://doi.org/10.1002/app.21759
  18. No, B.Y., Kim, M.G. 2007. Evaluation of melamine-modified urea-formaldehyde resins as particleboard binders. Journal of Applied Polymer Science 106: 4148-4156. https://doi.org/10.1002/app.26770
  19. Park, B.-D., Kang, E.C., Park, J.Y. 2006. Effects of formaldehyde to urea mole ratio on thermal curing behavior of urea-formaldehyde resin and properties of particleboard. Journal of Applied Polymer Science 101(3): 1787-1792. https://doi.org/10.1002/app.23538
  20. Pizzi, A., Lipschitz, L., Valenzuela, J. 1994. Theory and practices of the preparation of low formaldehyde emission UF adhesives. Holzforschung 48: 254-261. https://doi.org/10.1515/hfsg.1994.48.3.254
  21. Ringena, O., Janzon, R., Pfizenmayer, G., Schulte, M., Lehnen, R. 2006. Estimating the hydrolytic durability of cured wood adhesives by measuring formaldehyde liberation and structural stability. Holz als Roh-und Werkstoff 64: 321-326. https://doi.org/10.1007/s00107-005-0087-3
  22. Robitschek, R., Christensen, R.L. 1976. Degradation phenomena in urea-formaldehyde resin-bonded particleboard. Forest Products Journal 26(12): 43-46.
  23. Tohmura, S.I., Hse, C.Y., Higuchi, M. 2000. Formaldehyde emission and high-temperature stability of cured urea-formaldehyde resins. Journal of Wood Science 46: 303-309. https://doi.org/10.1007/BF00766221
  24. Walker, J.F. 1964. Formaldehyde. 3rd Edition, Robert E. Krieger Publishing Company, Malabar, Florida, USA, pp: 483-510.