Crosslinking Behavior of One Component Polyurethane Coatings based on Malonate Blocked Polyisocyanates: the Effect of the Malonate Structure and Optimization of the NCO:OH Ratio

• Autorzy: Greszta-Franz D. , Itter U.
• Języki publikacji: EN

Abstrakty

EN

The effects of the ratio of the hardener to binder on the onset of the cure, glass transition temperature and the crosslink density of one-component polyurethane coatings based on diethyl malonate blocked polyisocyanates was investigated using dynamical mechanical analysis. The crosslinking density of the cured films attained its maximum at blocked NCO:OH ratio of ca. 0.7, which is below the value commonly used in formulations and indicates that also the second ester group of diethyl malonate must be involved in the crosslinking. Furthermore, the crosslinking behavior of polyisocyanates blocked with different malonates (dimethyl; diethyl; diisopropyl; di-tert-butyl) and with a malonate substituted at the central carbon atom (dimethyl ethylmalonate) was examined as well.

• Wydawca: Sieć Badawcza Łukasiewicz – Instytut Inżynierii Materiałów Polimerowych i Barwników
• Czasopismo: Farby i Lakiery
• Rocznik: 2012
• Tom: nr 6
• Strony: 3--8
• Opis fizyczny: Bibliogr. 4 poz., rys.

Twórcy

autor

Greszta-Franz D.

• Bayer MaterialScience AG Coatings, Adhesives and Specialties Building Q1 51368 Leverkusen, Germany

autor

Itter U.

• Bayer MaterialScience AG Coatings, Adhesives and Specialties Building Q1 51368 Leverkusen, Germany

Bibliografia

• 1. Z.W. Wicks, Jr., B.W. Kostyk; J. Coat. Technol., 49 (634), p. 77 (1977)
• 2. B. W. Kostyk, Z. W. Wicks, Jr.; J. Polym. Sci. Polym. Chem. Ed., 17, p. 2423 (1979)
• 3. V. Mirgel, K. Nachtkamp; Farbe und Lack, 89 (12), p.928 (1983)
• 4. R. Jones, European Coatings Journal; 9, p.267 (2001)