Abstract
AbstractEffects of CaCO3 content on photocrosslinking and properties of UV‐curable coatings based on epoxy diacrylate resin (EDA), hexanediol diacrylate (HDDA) and photoinitiator I.184 have been studied. It was found that in investigated coatings with the weight ratio EDA/HDDA/I.184 = 50/50/3, CaCO3 content in the range of 10‐40 % provided fine and smooth films in used substrates. The presence of CaCO3 significantly reduced conversion of acrylate groups and quality of the UV‐cured coatings in comparison with the neat one. The increase of CaCO3 content slowed down the photocrosslinking process and inconsiderably affected to properties of investigated coatings in its range of 10‐20 %, but led to obvious decrease of their impact resistance and gloss in its further augment up to 40 %. Coating containing optimal CaCO3 content of 20 % from technical and economical points of view was determined to have gel fraction, relative hardness and gloss of 60o of 90 %; 0.94 %; 92.3 % after 2.4s of UV‐exposure, respectively.
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