International Journal of Safety

The Korean Society of Safety (한국안전학회)
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Thermal Hazard Evaluation on Self-polymerization of MDI

  • Sato, Yoshihiko (Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology (AIST)) ;
  • Okada, Ken (Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology (AIST)) ;
  • Akiyoshi, Miyako (Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology (AIST)) ;
  • Murayama, Satoshi (Central Research Laboratory, Nippon Polyurethane Industry Co., Ltd.) ;
  • Matsunaga, Takehiro (Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology (AIST))
  • Received : 2010.02.03
  • Accepted : 2010.06.10
  • Published : 2010.06.30
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Abstract

Thermal analysis, heating test on gram scale and simulation of exothermic behavior based on kinetic analysis has been conducted in order to evaluate thermal hazards of self-polymerization of MDI. The exothermic reactions of MDI are expected to be the polymerization which forms carbodiimide and carbon dioxide, dimerization and trimerization. When MDI is kept in adiabatic condition during 1 week (10080 hours), the simulated result shows runaway reaction can occur in the case that initial temperature was more than $130^{\circ}C$. The relationship between the initial temperature (T, $^{\circ}C$) and TMR is given in a following equation. TMR=$4.493{\times}10^{-7}$ exp ($9.532{\times}10^3$/(T+273.15)) We propose that the relationship gives important criteria of handling temperature of MDl to prevent a runaway reaction.

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References

  1. P. G Urban (Ed.), Brethericks handbook of reactive chemical hazards, 7th ed. vol. 2, Amsterdam: Elsevier, 2007.
  2. F. P. Lees, Loss prevention in the process industries, 2nd ed. Vol. 3, Oxford: Butterworth-Heinemann, 1996.
  3. H. J. Saunders and K. C. Frisch, High polymers vol. 16 pt. 1, Polyurethanes: Chemistry and technology, New York: Interscience, 1962.
  4. NETZSCH-Geratebau GmbH, NETZSCH Thennokinetics software, Version 2002.1a.
  5. H. L. Freidman, "Kinetics of thermal degradation of char-forming plastics from thennogravimetry application to a phenolic plastic", J. Polym. Sci. C, Vol. 6, p. 183, 1964.
  6. T. Ozawa, "A new method of analyzing thennogravimetric data", Bull. Chem. Soc. Japan, Vol. 38, No. 11, pp. 1881-1886, 1965. https://doi.org/10.1246/bcsj.38.1881
  7. J. Flynn and L. A. Wall, "A quick direct method for the detennination of activation energy from thennogravimetric data", J. Polym. Sci. B Polym. Lett., Vol. 4, p. 323, 1966. https://doi.org/10.1002/pol.1966.110040504
  8. NETZSCH-Geratebau GmbH, NETZSCH Thermal Simulations software, Version 2002.02a.
  9. P. H. Thomas, "On the thermal conduction equation for self-heating materials with surface cooling", Trans. Faraday Soc., Vol. 54, pp. 60-65, 1958. https://doi.org/10.1039/tf9585400060