열경화형 반응성 대전방지제의 배합

하진욱 순천향대학교 부설 산업기술연구소 2000 순천향 산업기술연구소논문집 Vol.6 No.1

A thermal curable coating composition with anti-static function(Ultramer 5212) was synthesized. It was 4^(th) ammonium salt which has long chain alkyl and hydroxyl(OH) groups. Anti-static coating agent was formulated with Ultramer 5212, polyisocyanate and various polyols. The additive amounts of Ultramer 5212 was varied from 5 to 30 wt% based on the amount of polyol. A thermal curable coating was performed with PET film at the range of temperature, 80-160 ℃. Results showed that the resistance(Ω) of PET film decreased as the amount of Ultramer incresed up to 10 wt%. However, the resistance decreased slightly over 10 wt% addition of Ultramer 5212. Methylethylketone(MEK) was the best solvent to keep the clearance of PET film. Coated PET film has the optimum physical properties when the mole ratio of polyisocyanate and polyol was 1. Life time test results show that Ultramer 5212 has much longer anti-static effect than other additive coating compositions which has been used in the field.

신 개념의 광촉매 응용 공기정화시스템

하진욱,김학수,한철희 한국산학기술학회 2003 한국산학기술학회 학술대회 Vol.- No.-

Photoelectrocatalytic system is based on the idea that the photogenerated electrons in a layer of TiO₂ would move toward a cathode with application of high voltage across the TiO₂ coated aluminum plate. In this system, aluminum plate is used as a substrate for TiO₂ and also serves as a cathode. According to our scheme, moving photogenerated electrons toward a cathode would have the same effect as moving these electrons away from the holes, which would have the effect of retarding recombination of photogenerated electrons with holes. Recent experiments on benzene and toluene showed higher rates of removal with high voltage on compared to high voltage off, which supported our scheme partially.

지글러-나타, 메탈로센 및 지글러-나타-메탈로센 혼합 촉매계에서 메틸 알루미녹센(MAO)의 첨가가 폴리에틸렌(PE) 물성치에 미치는 영향

하진욱 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.3 No.3

본 연구에서는 지글러-나타(TiCl₃1/3AlCl₃), 메탈로센(Cp₂ZrCl₂), 및 지글러-나타-메탈로센 혼합 촉매(hybrid catalyst)를 제조하여 에틸렌 중합에 대한 kinetic을 고찰하였다. 연구 결과 메틸 알루미녹센(MAO)의 조촉매(cocatalyst)로서의 역할을 제안하였다. 메틸 알루미녹센(MAO)은 촉매계에서 O₂, Lewis acid sites와 같이 electron donor의 역할을 하는 것으로 보인다. 에틸렌 중합에 의하여 제조된 폴리에틸렌(PE)의 열적 물성치들(thermal properties)-bulk density, heat of fusion, and melting temperature-은 중합에 사용된 촉매계(TiCl₃1/3AlCl₃, Cp₂ZrCl₂, 및 hybrid catalyst)와 조촉매(Ai(C₂H )₃, MAO)의 배합에 의존함을 알 수 있었다.

실리카에 담지된 몰리브드늄 촉매에서 몰리브드늄의 분산이 디벤조티오펜 탈황반응 활성도에 미치는 영향

하진욱 순천향대학교 부설 산업기술연구소 1997 순천향 산업기술연구소논문집 Vol.3 No.1

Several series of morphologically controlled MoO₃/Si0₂catalysts were prepared, characterized, and tested for hydrodesulfurization(HDS) of dibenzothiophene(DBT), activity. Molybdenum surface loading of 4.0 atoms Mo/nm²was prepared as sintered hexagonal and sintered orthorhombic, as well as a novel "well dispersed hexagonal" phase. Characterization by XRD and Raman reveals that the dispersion of MoO₃over silica depends on the final MoO₃phase in the order of; sintered hexagonal < sintered orthorhombic < dispersed hexagonal phase. Temperature programmed reduction(TPR) results show that both bulk and dispersed microcrystalline of MoO₃reduce to MoO₂at 650℃ and to Mo metal at 1000℃. HDS of DBT was performed in a differential reactor at 30 atom over the temperature range 350-500℃. Activity of MoO₃/SiO₂toward HDS of DBT is proportional to dispersion.

Drug release characteristics from nanoclay hybrids and their dispersions in organic polymers

하진욱 한국고분자학회 2013 한국고분자학회 학술대회 연구논문 초록집 Vol.2013 No.4

다이렉트 사출공법을 통하여 제조된 XLPP가 적용된 크래쉬패드 스킨의 감성 연구

하진욱,이평찬,황예진,곽성복,김범호 한국고분자학회 2015 한국고분자학회 학술대회 연구논문 초록집 Vol.2015 No.4

환경친화적 · 반영구적 수용성 대전방지 코팅액 배합

하진욱 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0

현대사회의 고속성장에 따라 고기능성을 갖는 전기·전자, 정보통신, 건축, 광학, 자동차 부품 등의 신재료를 창출하기 위한 기술 중 코팅기술은 경제성, 응용성 및 기능성을 다양하게 충족시킬 수 있는 기술로서 사용범위가 급속도로 확대되고 있다. 본 연구에서는 영구적 대전방지 효과를 나타낼 수 있는 열경화형 반응성 대전방지제와 환경친화적인 수용성 대전방지제를 합성하여 그 응용성을 고찰하였다. 연구결과 코팅 도막의 대전방지성을 영구히 유지하기 위한 단 분자형 대전방지제(YJ-AS 2000)를 합성하고 이 단량체를 여러 가지(urethane acrylate, diisocyanate, acrylic polyol)와 배합하여 영구적 대전방지 효과를 나타낼 수 있는 열경화형 반응성 대전방지제를 합성하였다. 또한 기존 대전방지제의 합성·배합공정에서 다량의 용매 사용에 따른 휘발성 유기화합물(VOC)배출에 의한 환경오염 문제를 해결하기 위하여 용매의 사용량을 최소화한 수용성 대전방지제(YJ-AS 2001)를 합성, 수용제형 수지(Ureathane)와 배합하여 환경친화적인 수용성 대전방지 코팅액을 개발하였다. 개발된 대전방지제를 플라스틱(PET 필림, PVC 바닥재 등)에 코팅하여 코팅층 물성[표면경도(Hardness), 접착력(Adhesion), 대전방지성(Surface Resistance), 내후성 등]을 고찰한 결과 기존의 첨가형 대전방지제보다 대전효과의 지속성이 우수하였으며, 특히 YJ-AS 2001의 경우 내수성 또한 월등히 우수한 것으로 나타났다.

광시증(Photophobia)환자를 위한 자외선 차단율이 우수한 광변색(Photochromic)렌즈 개발

하진욱 순천향대학교 부설 산업기술연구소 2004 순천향 산업기술연구소논문집 Vol.10 No.2

Photochromic lens is the color changing lens from light to dark with UV light. It can protect eyes from UV-B light which cause cataract and be used as sunglass in the summer since it can cut off 79~80% of sun light. Surface coating technique was used to develope lens which has 70% light transmittance and fading time of color change is within 10min. Various color lens were developed such as blue, green, brown, violet, yellow and red etc. Lens has an excellent physical properties, 100% adhesion and 4~5H hardness. Anti-chemical and scratch of lens are also excellent and it has a good thermal stability. Clinical trial of developed lens performed to 60 patients who had Photophobia by various reasons at ophthalmology of Soonchunhyang University Hospital. Results showed that glaring was reduced and improved amblyopia remarkably. Especially, anti-glaring effect in the night was great for the patient who had the LASIK operation. Protection of UV-B and blue light also can prevent the patient from cataract and yellowish of the crystalline lens for old ages. Though the result of clinical trial, photochromic lens could be a new technique for both cure and precaution of photophobia. Now, field test of developed lens is carrying out at manufacturing company for industrial uses and user will get the final product in the early of 2004.

무용제 타입 열경화형 대전방지제를 이용한 유/무광 코팅액 배합

하진욱,이도현 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.1

A thermally curable coating composition with anti-static function(Ultramer 5530) was synthesized. It was 4th ammonium salt which has long chain alkyl group. Anti-static coating agent was formulated with Ultramer 5530 and glare/or non-glare water soluble resins. The additive amounts of Ultramer 5530 was varied from 5 to 20 wt% based on the amount of resin. A thermally curable coating was performed with PVC floor at temperature ranges 80∼150℃. Results showed that electric resistance(Ω) of PVC floor decreased as the amount of Ultramer 5530 increased. However, physical properties of coating layer, especially hardness and adhesion, was getting worse over 8 wt% addition of Ultramer 5530, due to the surface migration of coating agent. The surface migration was removed when the curing temperature was over 100℃.

Calorizing(Aluminizing) 코팅 층의 표면특성 고찰

하진욱 한국산학기술학회 2000 한국산학기술학회논문지 Vol.1 No.1

Calorizing(또는 Aluminizing)에서 코팅분말의 입자크기 및 코팅온도가 금속표면에 형성된 코팅 층의 특성에 미치는 영향을 SEM과 EDXS를 사용하여 자세히 고찰하였다. 코팅분말은 입자크기별로 3단계로 분리하여 사용하였으며 코팅온도는 950 ℃와 980 ℃로 변화하였다. Calorizing 처리는 팩 세멘테이션 방법을 사용하여 아르곤 분위기에서 5시간 동안 행하였다. Calorizing 처리 결과 코팅분말의 입자크기가 감소하는 코팅온도가 증가할수록 코팅 층의 두깨와 코팅 층에서의 알루미늄의 함량이 증가하였다 또한 코팅분말의 크기가 작은경우(150-200 mesh) 코팅 층 표면에 형성된 기공이 현저히 감소하였고 표면의 균일성도 우수함을 알 수 있었다. The effect of particle size of coating powder and coating temperature on the properties of coating layer was studied by calorlzing(or aluminizing). The surface oroocrtics of coating layer were fully characterized. using SEM and EDXS. Coating powders were separated according to the particle size by 3 steps. and the coating temperature was varied from 950 ℃ to 980 ℃. Calorizing witn pack cementation method carried under Ar atmosphere for 5 hrs. Results show that the thickness and Al content of coating laver increased as the size of coating powder decreased and coaling temperature increased. And pores formed on the coating layer reduced and homogeneity of coating layer increased with smaller particle size of coating powder.