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Pigmented UV-Curable Alkyd

Chittavanich, Pongsith P.
http://rave.ohiolink.edu/etdc/view?acc_num=akron1259614294

Abstract Details

2009, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
A UV-curable tung oil alkyd (UVTA) was prepared from tung oil-based alkyd. The tung oil-based alkyd was synthesized via the monoglyceride process and then reacted with trimethylolpropane trimethacrylate (TMPTMA) via Diels-Alder cycloaddition. The tung oil-based alkyd and UVTA were characterized using 1H NMR, 13C NMR and gel permeation chromatography (GPC). Then the UV-curable alkyd was formulated with pigments to form a UV-curable paint. Pigments, especially yellow pigments, often interfere with the absorption of light of the photoinitiators, and, as a consequence, interfere with the curing of the coating and lead to the poor through-cure. The pigment chosen in this work is a mixture of yellow iron oxide, red iron oxide, titanium dioxide and lampblack with yellow iron oxide as a major component. A series of experiments was performed to optimize the through-cure of the coating. UV-A and UV-C light sources were used to radiate the formulations with six unimolecular initiators. Assessment of through and surface cure by thumb twist, blocking resistance and MEK single rub tests was performed to investigate the effect of the light sources and the photoinitiators used. The effects of reactive diluents were also investigated. Ten different reactive diluents were used. Coating properties of the formulations were determined by pencil hardness test, conical mandrel test, impact resistance test, cross cut adhesion test and gloss measurement. Viscoelastic characterizations of the coatings were determined using dynamic mechanical thermal analysis (DMTA). In an attempt to obtain a uniform dispersion, three pigment dispersion methods were employed 1) dispersion by a homogenizer 2) dispersion by a sonicator, and 3) dispersion by a planetary vacuum centrifugal mixer. Dispersion quality of the coatings was determined using optical microscopy, scanning electron microscopy and rub-out tests. It was observed that all of the methods could uniformly disperse the pigments. No flocculation was observed; however, pigment agglomerates were present. Through cure and surface cure assessment showed that optimum cure could be achieved by use of the UV-A source and the optimum formulation of two photoinitiators: phenylbis(2,4,6-trimethylbenzoyl)-phosphine oxide) at 2 wt% and 1-hydroxy-cyclohexyl-phenyl-ketone at 4 wt%. Preliminary coatings tests showed that the use of long chain linear structure diluents, such as isodecyl methacrylate, provided UV-curable paint films with better coating properties than other diluents. The paint films exhibited good coating properties including impact resistance, flexibility, and adhesion.
Mark D. Soucek, PhD (Advisor)
132 p.
Engineering; Materials Science
Tung Oil; Alkyd; UV Cure

Recommended Citations

Citations

  • Chittavanich, P. P. (2009). Pigmented UV-Curable Alkyd [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1259614294

    APA Style (7th edition)

  • Chittavanich, Pongsith. Pigmented UV-Curable Alkyd. 2009. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1259614294.

    MLA Style (8th edition)

  • Chittavanich, Pongsith. "Pigmented UV-Curable Alkyd." Master's thesis, University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1259614294

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.