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- 저자 : 조용광 (검색결과 6 건)
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불소를 함유한 UV경화 폴리우레탄 아크릴레이트 합성 및 복합체 제조에 따른 특성 연구
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.
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조용광 건국대학교 경영대학원 2000 국내석사
Considered at the viewpoint of the national economy, importance of small and medium enterprise (hereafter referred to as SME,) is, needless to say, enormous. In the history of fast economic growth of Korea, majority of governmental support had been rendered to large enterprises, consequently resulting in comparative inferiority of SME. Assembly plants and component makers were inevitably requested to look for their works from large industries, thus SME had suffered from increasing financial burden while large enterprises enjoyed growth of their business scales. Toleration with this passing phase lasted as long as the national economy was developing, but it could no longer exist when Korean economy arrived at international competition level, joining OECD and keeping pace with advanced countries in variety of economic activities. Now that overall industrial structure is rapidly changing, one industrial field will not advance without help of other associated fields. Coalition with SME turned up to be one of the essential factors of management for large enterprises, to secure optimal supplies of material and engineering, while SME felt requisition for raising its functional standpoint in the nationwide economic environment at the same time. This study pursued to define present status of SME, focusing at the small and medium manufacturers' roles and functions in the national economy, and comparing with overseas modelings of similar economic backgrounds. The study concludes that the SME will eventually lead total economy in the region it stands, and it suggests schemes to vitalize management of the small and medium enterprise, which includes, 1) growing leadership of the CEO. 2) respecting knowledge and information. 3) pursuing profit and respecting credit. 4) respecting human resources. 5) corresponding with global standard This study also suggests schemes to strengthen competitiveness of SME, which includes, 1) specializing business characters. 2) strategic coalition with relative concerns. 3) applying networks with other specialized enterprises. 4) applying electronic business system.
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