In this study, we experimented that how to synthesis waterborne urethane-epoxy hybrid resin for leather garment coatings. First of all, We had analyzed datas by FT-IR, SEM and TGA for the machanical properties. By instruments analysis measurement we confirmed that synthesis of urethane and epoxy. In this experiment we knew that polyurethane and urethane-epoxy hybrid resin have 4~5 grades of solvent resistance. Tensile strength measured in the urethane-epoxy resin(epoxy 12%, 2.033kgf/mm2) had the most strong strength than polyurethane(1.833 kgf/mm2) emulsion samples. Also urethane-epoxy hybrid resin had better result than polyurethane in acid resistance and abrasion test. As hight proportion of epoxy in hybid resin, we obtained low elongation and low flexibility. In this result, the mechanical properties of waterborne polyurethane-epoxy hybrid resin showed that how effect in leather coating by ratio of epoxy emulsion.

To increase pot life in the formulation mixed with bisphenol F epoxy resin, anhydride-based curing agent, and imidazole-based curing accelerator powders as a paste material for high-speed RFID chip bonding, size variation of the imidazole-based powders and a coating method of the powders were adopted in this study. In experiment with regard to the size variation, the pot life was not outstandingly increased. Through the idea using the coating method, however, the pot life was increased up to 4.25 times in comparison with the addition of initial imidazole-based powders. Consequently, successive bonding of RFID chip could be performed with very short time of 5sec using the suggested formulation having improved pot life.

We investigated heat stability of epoxy resin products and epoxy resin according to the influence hardener. The heat flow which shows the degree of thermal decomposition of the epoxy resin product and epoxy resin measured by using the differential scanning calorimeter (DSC). As a result, we found that in the case of heat stability for epoxy resin as hardener was added, the ratio of one to one (epoxy resin : hardener) was the most suitable in air condition and nitrogen atmosphere.

The epoxy resin materials used in outdoor high voltage equipments are required to have the high electric performance because of the miniaturization. The frequence dependence of the permittivity and the loss tangent have important information. In this paper we describe the frequency dependence of the permittivity and the loss tangent for epoxy resin filled with silica and the influence of filler shapes on the dielectric properties. The increment of tan δ in the low frequency region is caused by the increment of both the electrical conductivity and the polarization due to the shape of filler and the water absorbed in and near the interface between fillers and resins. The result of charge current and discharge measure, electric conduction is increased according to voltage.

방사선물질의 수송 및 저장용기 등에 사용되는 에폭시수지계 중섣자 차폐재, KNS-201, KNS-301 및 KNS-601을 제조하였다. 기본물질은 개질 및 수소 첨가된 비스페놀 A형 그리고 노블락형 에폭시수지이며, 첨가제로는 수산화알루미늄 및 탄화붕소이다. 이들 중성자 차폐재들의 열적 및 역학적 성질 및 재방사선성 등을 평가하기 위해 여러 특성시험을 행하였다. 조사된 제반 특성들은 열분해온도;257~280˚C, 열전도도;0.95~1.14W/m.K, 열팽창계수 ;0.77~1.26x10-6˚C-1, 연소특성;800˚C이하, 평균연소시간;5초 이하, 평균연소길이 ;5mm 이하, 인장강도;2.5~3.2Kg/mm2,압축강도:13.2~15.2kg/mm2 굴곡강도:5.2~604Kg/mm2 등을 나타냈다. 전반적으로 개발된 중성자 차폐재들의 관련 특성들이 외국에서 사용되는 중성자 차폐재, NS-4-RF보다 우수한 것으로 나타났다. 또한 KNS-601의 내방사선성이 KNS-201과 KNS-301보다 우수한 것으로 나타났다. 또한 KNS-601의 내방사선이 KNS-201과 KNS-301보다 우수한 것으로 나타났다.

In this study, solid-liquid separation conditions for coagulation and sedimentation experiments using inorganic coagulant (aluminum sulfate and Poly-Aluminum Chloride (PAC)) were optimized with brine wastewater discharged by the epoxy-resin process. When the turbidity and suspended solid (SS) concentration in raw wastewater were 74 NTU and 4.1 mg/L, respectively, their values decreased the lowest in a coagulant dosage of 135.0 - 270.0 mg Al3+/L. The epoxy resin was re-dispersed in the upper part of wastewater treated above 405.0 mg Al3+/L. The removal efficiencies of turbidity and SS via dosing with aluminum sulfate and PAC were evaluated at initial turbidity and SS of 74 - 630 NTU and 4.1 - 38.5 mg/L, respectively. They increased most in the range from 135.0 - 270.0 mg Al3+/L. The solid-liquid separation condition was quantitatively compared to the correlation of SS removal efficiency between the coagulant dosage and SS concentration based on the concentration of aluminum ions. The empirical formula,   , shows the relationship between SS removal efficiency (R) and coagulant dosage (D) at 38.5 mg/L; it produced high correlation coefficients (r2) of 0.9871 for aluminum sulfate and 0.9751 for PAC.

In this study, tensile properties of carbon fiber reinforced polymers(CFRP) with and without epoxy resin were compared by direct tension test. Although the strength contribution of resin is generally neglected because it is relatively infinitesimal and hard to be evaluated on-site application, resin enables CFRP itself to have higher strength and stiffness by arranging the layout of carbon fiber bundle, by decreasing the stressed effective length and by stress redistribution between fibers.

교통사고는 다양한 원인에 의해 발생한다. 도로 포장의 목적이 안전하고 쾌적한 이동이며, 차량의 주행속도가 높을수록 안전한 도로포장의 중요성이 커진다. 아스팔트 포장의 내구성을 향상하기 위한 기술 중 기존 화학 첨가제의 단순 혼합에 의한 개질 아스팔트의 한계를 극복하고자 반응형 아스팔트에 대한 관심이 높아지고 있으며 이중 대표적인 것인 에폭시 아스팔트 포장이다. 에폭시 아스팔트 혼합물은 아스팔트 바인더에 혼합된 에폭시 수지의 반응이 진행됨에 따라 경화가 진행된다. 따라서 이에 대한 정확한 예측을 통해 공사계획의 수립과 교통개방 가능시점의 결정이 가능하다. 에폭시 아스팔트 포장은 매우 뛰어난 내구성을 나타내기 때문에 이를 활용한 다양한 포장이 가능하며 특히 고가의 에폭시 아스팔트 포장의 적용을 확대하기 위해서는 에폭시 함량의 조절을 통해 필요한 성능의 확보와 경제성의 개선이 필요하다. 본 연구는 에폭시 수지 농도 변화에 따른 에폭시 아스팔트 혼합물의 경화속도 예측식을 제시하였다. 실외 양생 실험과 예측식과의 비교 결과 상관계수가 0.971 이상으로 나타나 예측식이 에폭시 함량 변화에도 에폭시 아스팔트 혼합물의 경화 정도를 예측 할 수 있는 것으로 나타났다.