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광투과성 지방족 에폭시 아크릴레이트의 전자선 경화 특성 연구
박상율(Sang Yul Park),손혜미(Hye Mi Son),명동신(Dong Shin Myung),김명화(Myung Hwa Kim),여영수(Young Soo Seo) 한국고분자학회 2013 폴리머 Vol.37 No.3
Glycerol diglycidyl ether와 acrylic acid를 반응하여 지방족 에폭시 아크릴레이트를 합성하였다. 반응 경과는 적외선 분광법, 라만 분광법과 1H NMR로 분석하였다. 합성한 에폭시 아크릴레이트의 전자선 조사에 의한 경화거 동을 조사하기 위해 전자선 조사량에 따른 시료의 분광 분석과 유리전이온도 분석, 인장 특성 등을 분석하였다. 이를 통해 약 30 kGy 정도의 저조사량에서 충분한 경화가 이루어짐을 확인하였다. 또한 합성한 에폭시 아크릴레이트 는 점도가 낮아 용매 사용 없이 코팅용으로 사용하기에 적합하며, 경화 시편이 높은 광학적 투과도를 가지고 있어 광학적 투명도를 요구하는 전자선 경화형 광학필름 코팅용에 적합할 것으로 생각된다. We synthesized aliphatic epoxy acrylate monomer by the reaction of glycerol diglycidyl ether and acrylic acid. The reaction was monitored by FTIR, Raman spectroscopy and 1H NMR. Electron-beam (E-beam) curing behaviors of the synthesized monomer were studied by spectroscopic analysis, glass transition temperature, and tensile properties. We found that curing reaction was complete in a low dosage of ca. 30 kGy. The viscosity of monomer was a low enough for coating without using diluents and the cured sample was highly transparent, indicating that the monomer can be used for an E-beam curable coating material on transparent optical films.
금형 재제조를 위한 공구강 소재 적층 공정 설계 최적화 및 시스템 개발
양성문(Sung-Moon Yang),유재현(Jae-Hyun Yu),박상율(Sang-Yul Park) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.3
The objective of this study is to devise and develop a remanufacturing process system employing metal additive manufacturing technology for mold refurbishment and surface reinforcement. Analyzed using metal powder, AISI H13 tool steel, known for its remarkable wear resistance and impact toughness, underwent examination for dissimilar material bonding characteristics within molds, followed by a comprehensive assessment of its mechanical behavior. An experimental design employing response surface analysis was used to systematically conduct experiments utilizing the central composite design (CCD) and Box-Behnken method, corresponding to response surface methodology (RSM), to optimize overall process variables and determine optimal conditions through variance analysis. Performance evaluation of the remanufacturing process was executed through wear tests, confirming a notable improvement in mechanical properties compared to the original state. The development of a remanufacturing system via a DED process with optimal conditions and a non-adherent support jig device facilitated post-processing by extending the virtual deposition area using a substrate forming a non-adherent film with brazing stop-off. We believe the proposed method is applicable for industrial mold remanufacturing by establishing an optimal process and constructing a remanufacturing system.