Comparison of Modifiers for Durability Improvement of UREA-formaldehyde Resin

Authors

  • P. R. Steiner
  • S. Chow

Keywords:

Douglas-fir laminates, melamine, furfuryl alcohol, aluminum powder, resorcinol, softening point, accelerated aging, thermal sensitivity

Abstract

Several common organic modifiers, having varying degrees of reactivity and functionality, were evaluated at different levels of addition for their improvements to the relative durability of urca-formaldehyde (UF) glue-wood bonds. The recently developed thermal-softening technique was used to determine the thermal sensitivity of cured samples of these modified resins. Urea-formaldehyde resin containing modifiers with aromatic character and high potential reactivity, such as melamine, furfuryl alcohol, and resorcinol, showed significant increases in thermal-softening points compared with unmodified resin. Accelerated-aging tests on Douglas-fir laminates bonded with UF resins modified with either melamine, 2-imidazolidinone, or furfuryl alcohol showed that durability ranking correlated closely to the softening points of these adhesives. One inorganic modifier, aluminum powder, gave an improvement in softening point, but exhibited poor durability with wood bonds in aging tests.

References

Berni, R. J., R. R. Benerito, W. M. Ayres, and H. B. Jonassen. 1963. Metal ion complexes of 2-imidazolidinone (ethylene urea). J. Inorg. Nucl. Chem. 25:807-818.nBlomquist, R. F., and W. Z. Olson. 1964. Durability of fortified urea-resin glues exposed to exterior weathering. For. Prod. J. 14:461-466.nBrown, L. H., and E. K. Stigger. 1961. Furfuryl alcohol as a resin modifier. Mod. Plast. 39(4):135.nChow, S. 1973. Softening temperature and durability of wood adhesives. Holzforschung 27:64-68.nChow, S., and K. J. Pickles. 1971. Thermal softening and degradation of wood and bark. Wood Fiber 3:166-178.nGillespie, R. H., W. Z. Olson, and R. F. Blomquist. 1964. Durability of urea-resin glues modified with polyvinyl acetate and blood. For. Prod. J. 14:343-349.nNakarai, Y., T. Watanabe, and M. Ono. 1963. The effect of modification by furfuryl alcohol to urea-formaldehyde resin adhesive. Wood Ind. (Japan) 18(4): 171-176.nPenland, R. B., S. Mizushima, C. Curran, and J. V. Quagliano. 1957. Infrared absorption spectra of inorganic co-ordination complexes. X. Studies of some metal-urea complexes. J. Am. Chem. Soc. 79:1575-1578.nSteiner, P. R. 1973. Durability of urea-formaldehyde resins: Effect of molar ratio, second urea and filler. For. Prod. J. 23:(12)32-38.nTarakhtunov, O. A. 1968. Influence of aprotic acid on properties of urea-formaldehyde resins. Sov. Plast. 37-38.nTroughton, G. E. 1968. Accelerated aging of glue-wood bonds. Wood Sci. 1:172-176.nYanagawa, R., and O. Matsumura. 1962. The study of wood adhesives I. The effect of melamine to fortify urea-formaldehyde resin adhesives. J. Jap. Wood Res. 8:62-67.n

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Published

2007-06-05

Issue

Number 1 / Spring 1974

Section

Research Contributions

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