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엄재열,이병학,신판우,김용렬 한국환경보건학회 2002 한국환경보건학회지 Vol.28 No.2
Resource recovery and recycling of materials and products including polyurethanes are viewed as a necessity in today s society. The problems of recycling polyurethane wastes has major technological, economic and ecological significance because polyurethane itself is relatively expensive and its disposal by burning is also costly. In general, the recycling methods for polyurethane could be classified as mechanical, chemical and physical. In the chemical recycling method, there ate hydrolysis, glycolysis, pyrolysis and aminolysis. This study was carried out glycolysis using new method such as sonication and catalyzed reaction. There are kinds of recycled polyols were produced by current method(glycolysis) but, this study were with catalyzed reaction and sonication as decomposers and the chemical properties were analyzed. The reaction results in the formation of polyester urethane diols and then the OH value which is determined by the quantity of diol used for the glycolysis conditions. The glycolysis rates by sonication and catalyzed reaction for the various glycols, increased as: PPG
폴리에스테르/폴리락톤 폴리올과 TDI-Isocyanurate에 의한 폴리우레탄 도료의 제조 및 경화거동
박홍수,최용호,김태옥,신판우 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.6
Polyester/polylactone polyols with of without benzoic acid unit were synthesized by polycondensation of polycaprolactone 0201, trimethylolpropane, adipic acid, and benzoic acid. Then, two-packaged polyurethane coatings with three dimensional network structure were prepared by curing the produced polyols with TDI-isocyanurate at ambient temperature. Various tests on the coating properties of the prepared coatings showed a remarkable improvement in the physical properties. The introduction of polycaprolactone 0201 as diol in the polyurethane coatings improved the cross hatch adhesion, flexibility, impact resistance, and hydrocarbon resistance of coatings. Changes in the drying and curing behavior with the contents of benzoic acid suggest that they have reasonable coating properties, such as drying time of 2 to 4 hours and pot-life time of 18 to 39 hours.
수용성 아크릴 변성 에폭시에스테르 수지의 합성 및 도막물성
김성길 ( Seong Kil Kim ),신판우 ( Pan Woo Shin ),이동찬 ( Dong Chan Lee ) 한국유화학회 2011 한국응용과학기술학회지 Vol.28 No.1
For the synthesis of water soluble acrylic modified epoxyester resin, fatty acid/epoxy ratio of 50/50 was used, and introduced maleic anhydride. Ratio of styrene/acrylic acid of acrylic monomers was fixed 85/15 and ratio of epoxyester/acrylic monomer was controlled 80/20, 75/25, 70/30, 65/35, and degree of neutralization were changed 65%, 80%, to 100%. As a result, 40% solids acrylic modified epoxyester resins were synthesized. Resins were evaluated water soluble stability, drying time, water resistant, storage stability and physical properties. And the white paints were prepared, and were evaluated viscosity, drying time, water resistance, adhesion, sagging, spray workability, gloss, salt spray resistance, skinning, whiteness and flash rust. As a result, the degree of neutralization of 100% and the ratio of epoxyester/acrylic monomer of 75/25 showed the best properties.
민성진(Sung Jin Min),공승대(Seung Dae Kong),윤철훈(Cheol Hun Yoon),강안수(An Soo Kang),엄재열(Jae Yeol Eom),신판우(Pan Woo Shin),이석우(Seok Woo Lee) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.2
N/A Eu(Ⅲ) exhibits one electron-transfer reduction at E_1/2 = -0.564 V(vs. Ag/AgCl) and the hypersensitive peak at 615 ㎚ corresponding to ^5D_0→^7F_2 transition in 0.1 M LiClO_4 aqueous solution. Upon the addition of 2,6-pyridine dicarboxylic acid(PDA) to the Eu(Ⅲ) aqueous soultion, the reduction potential shifts negatively and the PDA, and the Eu(Ⅲ)-PDA complex emits great fluorescence than free-Eu(Ⅲ) ion at 615 ㎚. The results are interpreted in term of the electrochemical and spectrofluorometric studies.