The rheokinetics of a fast-curing polyurethane

• Autorzy: Polushkin E. , Polushkina O. , Malkin A. Y. , Blaurock J. , Kleba I. , Michaeli W.
• Konferencja: Proceedings of the International Conference on Engineering Rheology ICER '99
• Języki publikacji: EN

Abstrakty

EN

A viscosity build-up of various fast curing polyurethane compositions has been investigated under isothermal conditions. A diisocyanate (DI) and a polyol (PO) forming the polyurethane in course of the exothermic reaction were mixed with an original single-screw mixer in the mass ratios from 1:3 to 3:1. The rheokinetic measurements were carried out with a modified cone-plate rheometer in range of shear rates from 0.025 to 6.2 s-1 at temperatures from 22 to 114oC. It has found that the maximal rate of viscosity growth is observed for the polyurethanes with the ratio of DI:PO falling in the narrow range between 1:1 and 1.5:1. It is interesting that these curing systems have shown the Newtonian behaviour up to the viscosity value of 105 Pa*s at the shear range of 0.04 to 0.6 s-1. The obtained curves can be fitted with the equation 'eta'='eta'0*exp(k*t) on the initial stage of the viscosity rise only. For more precise fitting of the entire rheokinetic curve a modified exponential equation with the parameter k depending on the time t is proposed.

Słowa kluczowe

EN

polyurethane; fast curing; viscosity build-up; fitting

PL

hydromechanika

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: Applied Mechanics and Engineering
• Rocznik: 1999
• Tom: Vol. 4, no spec.
• Strony: 85--90
• Opis fizyczny: Bibliogr. 14 poz., wykr.

Twórcy

autor

Polushkin E.

autor

Polushkina O.

autor

Malkin A. Y.

autor

Blaurock J.

autor

Kleba I.

autor

Michaeli W.

• A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Science, Moscow, RUSSIA