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Benefits and Limits of Radiation Cured Coatings
Although the final properties of radiation cured coatings are often superior to other systems, the reason for their popular growth has been primarily due to improvements in productivity, ability to coat heat and solvent or water-sensitive substrates, and environmental emission considerations.
Little or no solvent emissions or VOCs, no fire hazard and no hazardous solvents UV light must "see" the photoinitiators to cure the coating; therefore curing of complex geometries may be difficult Excellent performance properties such as high gloss depth, abrasion resistance, chemical resistance, and hardness UV technology may not cure thick coatings or opaque colors as thoroughly as EB technology Smooth finish (unlike powder and some spray coatings) UV generates some heat (infrared range) during cure. This is a disadvantage to some heat sensitive parts but can be an advantage to coating systems that require additional thermal energy to cure Extended open time during use High capital equipment costs Reduced down time, waste, and cleanup High materials costs Energy savings May not be cost effective for wide applications Reduction of floor space requirements Some formulations have post-cure instability (yellowing) when exposed to direct sunlight Low temperature, solvent free cure process suitable for temperature or chemical sensitive substrates Oxygen inhibition is a problem with certain formulations Very fast production, cures in milliseconds Some components are skin irritants In-line processing capability and minimal manufacturing steps No FDA approval A variety of different chemistries and formulations from which to select
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All rights reserved.
Contact: hualong@nhhualong.com