Ultraviolet-radiation-curable paints
In product finishing lines, ultraviolet radiation curing of paints on prefabricated structures could be more energy efficient than curing by natural gas fired ovens, and could eliminate solvent emission. Diffuse ultraviolet light can cure paints on three dimensional metal parts. In the uv curing process, the spectral output of radiation sources must complement the absorption spectra of pigments and photoactive agents. Photosensitive compounds, such as thioxanthones, can photoinitiate unsaturated resins, such as acrylated polyurethanes, by a free radical mechanism. Newly developed cationic photoinitiators, such as sulfonium or iodonium salts (the so-called onium salts) of complex metal halide anions, can be used in polymerization of epoxy paints by ultraviolet light radiation. One-coat enamels, topcoats, and primers have been developed which can be photoinitiated to produce hard, adherent films. This process has been tested in a laboratory scale unit by spray coating these materials on three-dimensional objects and passing them through a tunnel containing uv lamps.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (USA). Research and Development Center
- DOE Contract Number:
- AC01-79CS40210
- OSTI ID:
- 5342501
- Report Number(s):
- DOE/CS/40210-T2; ON: DE82015717
- Country of Publication:
- United States
- Language:
- English
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ACRYLATES
AMINES
AROMATICS
BENCH-SCALE EXPERIMENTS
CARBOXYLIC ACID SALTS
COATINGS
CURING
DATA
EFFICIENCY
ELECTROMAGNETIC RADIATION
ENERGY EFFICIENCY
EXPERIMENTAL DATA
FILMS
HARDNESS
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PAINTS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYAMIDES
POLYMERS
POLYURETHANES
QUINONES
RADIATIONS
RESINS
SPRAYED COATINGS
SYNTHETIC MATERIALS
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION