PHOTOLYTICALLY INDUCED DEGRADATION--EFFECTS OF PIGMENTS
This article focuses on the use of some pigments to protect coating films against ultraviolet (UV) attack. The role other pigments play in the degradation of coatings by UV is also discussed. Pigment is, in fact, often the primary defense against the UV degradation of coating films. Not all pigments are good UV absorbers. In fact, the extenders as a group are quite transparent to UV. Therefore, they can afford little UV protection in this regard. Pigmentary titanium dioxide (TiO2), especially the rutile form, is an excellent UV absorber; it is also photocatalytic. The oxidative destruction of the binder around the TiO2 particles loosens the particle itself as the binder is reduced to oxidized residues of low molecular weight. Anatase TiO2 is actually a poorer hiding pigment than rutile. Much progress has been made in the design of TiO2 pigments for optimum chalking resistance. Caution is also necessary to avoid other undesirable color changes resulting from combinations of TiO2 and other coating ingredients.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/87551985
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Supplemental Notes:
- Page Range: pp 54, 56-60, 62-64
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Corporate Authors:
Technology Publishing Company
2100 Wharton Street, Suite 310
Pittsburgh, PA United States 15203 -
Authors:
- Hare, C H
- Publication Date: 2000-4
Language
- English
Media Info
- Features: Figures; Photos; References; Tables;
- Pagination: 9 p.
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Serial:
- Journal of Protective Coatings & Linings
- Volume: 17
- Issue Number: 4
- Publisher: Steel Structures Painting Council
- ISSN: 8755-1985
Subject/Index Terms
- TRT Terms: Binders; Chalks; Coatings; Degradation failures; Photolysis; Pigments; Titanium; Ultraviolet light; Ultraviolet radiation
- Subject Areas: Geotechnology; Highways; Materials; I35: Miscellaneous Materials;
Filing Info
- Accession Number: 00792405
- Record Type: Publication
- Files: TRIS
- Created Date: May 22 2000 12:00AM