불소를 함유한 UV경화 폴리우레탄 아크릴레이트 합성 및 복합체 제조에 따른 특성 연구

Abstract

UV-curable resin refers to a resin with an unsaturated group like C=C in its molecular structure, which is cured by photo-initiator when it exposures light (UV ray). UV curing is conducted quickly at a low temperature, so it saves energy and it has excellent coating performance and curing characteristics. In addition, since it is in a liquid form using reactive acrylic monomers, it has the advantage in VOC problems caused by organic solvent because reactive acrylic monomers acts as a diluent. In this study, polyurethane acrylates containing hydrophobic fluorine group were synthesized in order to introduce a water-repellent property through UV curing. H12MDI with excellent yellowing resistance and water resistance was used as isocyanate. Polycarbonate diol (PCDL) and perfluoropolyether diol (PFPE) were used as polyol. As increasing PFPE content upto 10 % in polyol, the contact angle of polyurethane acrylates increased from 75.9∘ to 107.1∘. However, their mechanical properties were almost unchanged, regardless of PFPE content. This result indicates that the surface hydrophobicity can be achieved by the introduction of PFPE in polyurethane acrylates. Also, the effect of adding lotus leaf powder into the polyurethane acrylates on surface property was investigated. The polyurethane acrylate composite with 2 wt% lotus powder showed that their contact angle improved up to 120.6∘. Therefore, the surface hydrophobicity of UV-curable polyurethane acrylate could be improved by physical and chemical mixing of hydrophobic compounds.