Artículos de revistas
Wood Adhesives From Eucalyptus Tar And Creosote [alcatrão Ou Creosoto De Eucalipto Na Produção De Adesivos Fenólicos Para Colagem De Madeira]
Registro en:
Quimica Nova. , v. 20, n. 4, p. 365 - 371, 1997.
1004042
2-s2.0-3242753326
Autor
Pimenta A.S.
Vital B.R.
Fujiwara F.Y.
Institución
Resumen
This study has shown that Eucalyptus tar and creosote can be used in phenolic adhesive formulations (resols) for wood products bonding. Some adhesives were prepared substituting 0; 17.7; 35.0 and 67.0% of the phenol by anhydrous tar and 0; 15.0 e 28.5% by creosote. In gluing Brazilian pine veneers, eucalypt tar and creosote based adhesives required longer pressing times for curing than conventional phenol-formaldehyde adhesives. By using 13C NMR, the number of carbons in side chains and hydroxyl, carbonyl, carboxyl and methoxyl groups related to 100 aromatic rings could be estimated in tar and creosote. In creosote, after reaction with excess formaldehyde in alkaline medium, only 0,28 hydroxymethyl groups was detected per phenolic ring. This low amount of hydroxymethylation explains the lack of reactivity in curing observed when creosote was introduced in a standard adhesive formulation. 20 4 365 371 Christiansen, A.W., Gollob, L., (1985) J. Appl. Polymer Sci., 30, p. 2279 Keinert Jr., S., Wolf, F., (1984) Alternativas de Adesivos à Base de Taninos para Madeira, p. 25. , Curitiba, FUPEF, Série Técnica Lewis, N.G., Lantzy, T., (1989) Adhesives from Renewable Resources Washington, pp. 96-109. , American Chemical Society ACS symposium series Dolenko, A.J., Clarke, M.R., (1978) Forest Products Journal, 28, p. 41 Pizzi, A., (1994) Advanced Wood Adhesives Technology, , New York, Marcel Dekker Chum, H., Diebold, J., Scahill, J., Thompson, D., Black, S., Sdhroeder, H., Kreibich, R.E., (1989) Adhesives from Renewable Resources, pp. 135-151. , American Chemical Society. ACS, Washington, ACS symposium series Santos, C.G., Laranjeira, A.D., Carazza, F., (1988) Quím. Nova, 11, p. 284 Pasa, V.M.D., Otani, C., Carazza, F., (1993) Proceedings of the 3re Brazilian Symposium of Lignins and Other Wood Components, 4. , Belo Horizonte Pasa, V.M.D., (1994) Piche Do Alcatrão de Eucalyptus: Obtenção, Caracterização e Desenvolvimento de Aplicações, , Imprensa Universitária - UFMG, Belo Horizonte, Tese de Doutoramento Campbell, A.G., Walsh, A.R., (1985) J. Adhesion, 18, p. 301 Elder, T.J.J., (1979) The Caracterization and Potential Utilization of the Phenolic Compounds Found in a Pyrolitic Oil, 91p. , Texas, A & M University, Tese de Doutoramento Maciel, A.S., (1989) Produção de Adesivos a Partir de Derivados Fenólicos de Alcatrão Vegetal, 89p. , Viçosa, MG, UFV, Dissertação de Mestrado Wenzil, H.F.J., (1970) The Chemical Technology of Wood, , John Wiley e Sons, New York Gillespie, R.H., (1989) Adhesives from Renewable Resources, pp. 135-151. , American Chemical Society. ACS, Washington, ACS symposium series Pimenta, A.S., Vital, B.R., Brazilian Patent. INPI - PI 9502117-5, publicada 19/05/95(1994) Annual Book of Standards, , Washington Maarton, J., Marton, T., Falkehag, S.I., Adler, E., (1966) Adv. Chem. Ser., 59, p. 125