붕소를 함유하지 않는 E-glass fiber의 제조 및 특성에 대한 연구

이지선,임태영,이요셉,이미재,황종희,김진호,현승균,Lee, Ji-Sun,Lim, Tae-Young,Lee, Yo-Sep,Lee, Mi-Jai,Hwang, Jonghee,Kim, Jin-Ho,Hyun, Soong-Keun 한국결정성장학회 2013 韓國結晶成長學會誌 Vol.23 No.1

E-glass 섬유는 항공기, 자동차, 레져기구의 복합재료 보강용으로 가장 널리 사용되는 유리섬유이다. 그러나 최근 E-glass 섬유의 원재료비 상승, 환경문제 및 화학적 저항성과 기계적 특성을 향상시키기 위해 산화붕소 함량을 8 %에서 0(제로)까지 감소시키는(소위 'Boron free E-glass'라고 불리는) 연구가 진행되고 있다. 본 연구에서는 'BF(Boron free E-glass)' 조성의 벌크유리와 섬유유리를 제조하고, 열적특성 및 광학적특성을 평가하였다. 5~10 %의 서로 다른 알루미나 함량을 갖는 배치를 $1550^{\circ}C$에서 2시간 용융하여 'BF(Boron free E-glass)'가 얻어졌고, 81~86 %의 높은 가시광투과율, $4.2{\sim}4.9{\times}10^{-6}/^{\circ}C$의 낮은 열팽창계수, $907{\sim}928^{\circ}C$의 연화점을 갖는 투명하고 맑은 유리가 얻어졌다. 'BF' 섬유 시편에 대한 화학적내구성 시험에 있어서는 알루미나 함량이 높아질수록 더 좋은 침식저항성을 나타냄을 확인할 수 있었다. E-glass fiber is the most widely used glass fiber for reinforced composite materials of aircrafts, automobiles and leisure equipments. But recently researches are being progressed to reduce boric oxide from 8 % to 0 (zero), as is called 'Boron free E-glass', because of increasing material cost, environmental problem, and improving chemical resistance and mechanical properties of E-glass fiber. In this study, we fabricated the bulk glass and fiber glass of 'Boron free E-glass (BF) compositions', and characterized thermal properties and optical properties. 'Boron free E-glass (BF)' was obtained by the melting of mixed batch materials at $1550^{\circ}C$ for 2 hrs with different $Al_2O_3$ compositions 5~10 %. We obtained transparent clear glass with high visible light transmittance value of 81~86 %, and low thermal expansion coefficient of $4.2{\sim}4.9{\times}10^{-6}/^{\circ}C$ and softening point of $907{\sim}928^{\circ}C$. For the chemical resistance test of 'BF' fiber samples, we identified that the higher alumina contents gives the better corrosion resistance of glass fiber.

사암계 석탄폐석을 활용한 E-glass fiber 조성의 유리 제조 및 특성

이지선,임태영,이미재,황종희,김진호,현승균,Lee, Ji-Sun,Lim, Tae-Young,Lee, Mi-Jai,Hwang, Jonghee,Kim, Jin-Ho,Hyun, Soong-Keun 한국결정성장학회 2013 韓國結晶成長學會誌 Vol.23 No.4

삼척도계지역의 탄광에서 석탄채굴시에 부산물로 발생되는 사암계 석탄폐석을 원료로 사용하여 E-glass fiber 조성의 유리를 제조하였다. 본 연구에서는 카본함량이 비교적 적은 실리카-알루미나질의 사암계 석탄폐석을 사용하였으며, 폐석의 투입량을 0~35 %까지 변화시켰다. 서로 다른 석탄폐석 투입량을 갖는 배치원료를 $1550^{\circ}C$에서 2시간 용융하여 E-glass조성을 갖는 투명하고 맑은 유리가 얻어졌고, 81~84 %의 높은 가시광투과율, $5.39{\sim}5.61{\times}10^{-6}/^{\circ}C$의 열팽창계수, 851~$860^{\circ}C$의 연화점을 나타내었다. 유리섬유 시편은 $1150^{\circ}C$에서 섬유인상장치를 통해 얻어졌고, 복합재료의 보강용 유리섬유로서 내화학성 시험과 기계적 특성평가를 위한 인장강도를 측정하였다. 그 결과 석탄폐석을 사용한 E-glass fiber의 특성이 석탄폐석을 사용하지 않은 보통 E-glass 섬유에 비해 충분히 양호한 특성을 나타내어 E-glass 섬유용 원료로서 석탄폐석의 활용가능성을 확인할 수 있었다. The glass of E-glass fiber composition was fabricated by using refused coal ore which is obtained as by-product from Dogye coal mine in Samcheok. We used silica-alumina refused coal ore which has low carbon content relatively, and the amount of refused coal ore has been changed from 0 to 35 % in batch composition. E-glass was fabricated by the melting of mixed batch materials at $1550^{\circ}C$ for 2 hrs with different refused coal ore composition of 0~35 %. We obtained a transparent and clear glass with high visible light transmittance value of 81~84%, thermal expansion coefficient of $5.39{\sim}5.61{\times}10^{-6}/^{\circ}C$ and softening point of $851{\sim}860^{\circ}C$. The glass fiber samples were also obtained through fiberizing equipment at $1150^{\circ}C$, and tested chemical resistance and tensile strength to evaluate the mechanical property as a reinforced glass fiber of composite material. As the result, we identified the properties of E-glass fiber by using refused coal ore are plenty good enough compare to that of normal E-glass without refused coal ore, and confirmed the possibility of refused coal ore as for the raw material of E-glass fiber.

섬유화 온도 변화에 따른 E-glass fiber의 물리적 특성

이지선,이미재,임태영,이영진,전대우,현승균,김진호,Lee, Ji-Sun,Lee, MiJai,Lim, Tae-Young,Lee, Youngjin,Jeon, Dae-Woo,Hyun, Soong-Keun,Kim, Jin-Ho 한국재료학회 2017 한국재료학회지 Vol.27 No.1

E (Electric) -glass fibers are the most widely used glass fibers, taking up 90 % of the long glass fiber market. However, very few papers have appeared on the physical characteristics of E-glass fibers and how they depend on the fiberizing temperature of fiber spinning. Glass fiber was fabricated via continuous spinning process using bulk E-glass. In order to fabricate the E-glass specimen, raw materials were put into a Pt crucible and melted at $1550^{\circ}C$ for 2hrs; mixture was then annealed at $621{\pm}10^{\circ}C$ for 2hrs. The transmittance and adaptable temperature for spinning of the bulk marble glass were characterized using a UV-visible spectrometer and a viscometer. Continuous spinning was carried out using direct melting spinning equipment as a function of the fiberizing temperature in the range of $1175{\sim}1250^{\circ}C$, while the winder speed was fixed at 500 rpm. Subsequently we investigated the physical properties of the E-glass fiber. The average diameter of the synthesized glass fiber was measured by optical microscope. The mechanical properties of the fiber were confirmed using a UTM (universal materials testing machine); the maximum tensile strength was measured and found to be $1843{\pm}449MPa$ at $1225^{\circ}C$.

Valuable Recycling of waste glass generated from the liquid crystal display panel industry

Kim, Kicheol,Kim, Kidong Elsevier 2018 Journal of cleaner production Vol.174 No.-

<P><B>Abstract</B></P> <P>Due to the drastic growth of the liquid crystal display (hereafter LCD) industry in the last decade, lots of waste glass is being produced. There are three types of waste glass derived from LCD glass manufacturers, LCD panel manufacturers and end-of-life LCD devices. Among them cullet from Lber glass (hereafter E-glass). However, the recycling of waste glass from LCD panel (LPWGCD glass is being recycled into a raw material for commercial electric continuous fi) and end waste glass is limited due to various reasons such as contaminants, toxic components and inhomogeneous glass compositions etc. Despite use of LPWG in the cement industry, it is not an effective form of recycling, considering the characteristics of LCD glass. In this work, to examine the possibility of recycling LPWG in the E-glass industry, several glass batches containing LPWG were prepared. First, some optical properties of the prepared and commercial E-glass were examined. Then, the viscosity and liquidus temperature (T<SUB>L</SUB>) were determined. The effect of LPWG was negligible in the transmission and color of the resultant glasses, considering that commercial bulk E-glass has an emerald-green color due to refractory corrosion. With an increase in the LPWG content, the isoviscosity and liquidus temperatures showed opposite behaviors; the temperature (T<SUB>W</SUB>) corresponding to the fiber forming viscosity (10<SUP>3</SUP> dPas) decreased, whereas the T<SUB>L</SUB> increased. Based on T<SUB>W</SUB>-T<SUB>L</SUB>, the replacement of 50 wt% of the original E-glass with LPWG was recommended. Additionally, economic and environmental effects were discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recycling of LCD process waste glasses (LPWG) in E-glass was examined. </LI> <LI> Source of B<SUB>2</SUB>O<SUB>3</SUB> such as colemanite was replaced by LPWG. </LI> <LI> Effect of contaminants coated to the surface of LPWG was negligible. </LI> <LI> Two important melt properties for LPWG content showed an opposite behavior. </LI> <LI> Replacement of E-glass with LPWG up to 50% in glass batch was suggested. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Osteoblast behaviours on nanorod hydroxyapatite-grafted glass surfaces

So Jung Park,Kailash Chandra Gupta,김훈,Sukyoung Kim,Inn-Kyu Kang 한국생체재료학회 2020 생체재료학회지 Vol.24 No.1

Background: The goal of this study is to obtain basic information to improve the bone adhesion of silica components, which are used as the main ingredient in glass ionomer cement (GIC). To achieve this, nanorod hydroxyapatite (nHA) was grafted to the surface of silica cover glass. Surface analysis confirmed nHA was joined to the glass surface and biocompatibility with osteoblasts was investigated. Results: The grafting of nHA on the surface of slide cover glass (Glass) was confirmed by X-ray photoelectron spectroscopy (XPS) and contact angle (θ) measurement. MC3T3-E1 cells were more stretched out on the nHA-grafted cover glass (Glass-nHA) in comparison to the Glass. In addition, the Glass-nHA was more bioactive in supporting the proliferation of MC3T3-E1 cells in comparison to cells seeded on the Glass. Conclusion: The Glass-nHA was to be highly bioactive and this might be useful information for property modification of GIC.

부산지역 사무소 건물의 Low-E 유리 최적 코팅위치 선정에 관한 연구

박종언(Park, Jong-Eon),박헌준(Park, Heon-jun),이정재(Yee, Jurng-Jae) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.4

The study of this paper is to analysis of property which irradiated internal heat gain of office in Busan. Base on this, It was selected Low-E glass optimal coating position for office in Busan. Internal heat gain property which surveyed for office in Busan was occupancy density 8.63W/㎡, lighting density 10.67W/㎡, computer density 6.04W/㎡, monitor 3.01W/㎡, copier & printer 1.68W/㎡, fax machine 0.08W/㎡. Analysis results were as follows of annual cooling & heating load of effective. 2# coating Low-E glass was result value of 614,753.05kWh/yr from building position of west. 3# coating Low-E glass was result value of 686,046.87kWh/yr from building position of north. The office in Busan was effective of 2# coating Low-E glass.

유리섬유 강화 복합재료를 이용한 마찰재 개발에 관한 연구

김영운(YOUNG-UN KIM),최문호(MOON-HO CHOI),서상하(SANG-HA SEO),김부안(BU-AHN KIM),문창권(CHANG-KWON MOON) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.4

This study has been investigated to apply fiber reinforced composites instead of asbestos as a friction material. The reinforcement used was E-glass fiber and binder resin was phenol having good mechanical properties and heat resistance. And it has been also investigated the effect of molding conditions and some additives such as carbon black, alumina and rubber powder in E-glass fiber/phenol resin composites on the friction and wear characteristics. As a result, it was found that the molding conditions of E-glass fiber/phenol resin composites for friction materials had to be different from those of phenol resin and was found that the wear rate of E-glass fiber/phenol resin composites added alumina powder was higher than that of composites added carbon black in the same wear distance. And it was also found that friction coefficient of E-glass/phenol resin composites added carbon black was decreased and that of the composites added the powder of natural rubber and ABS rubber were increased compared to the composites.

공동주택 발코니 확장에 따른 창호종류별 에너지 성능 평가연구

안영섭(An Young-Sub),박재성(Park Jae-Sung),김병수(Kim Byoung-Soo),윤종호(Yoon Jong-Ho),황상근(Hwang Sang-Geun) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-

Apartment balcony has been indiscreetly remodelled since the government permitted remodeling on January 2006. But remodeled balcony has a few problems such as increase of heating energy, surface condensation and cold draft. The reason of thermal problem is mainly caused by the window system of a extended balcony. The purpose of this study is to analyze the thermal characteristics and propose the efficient window types for the extended balcony area of a apartment building. 4 types of window system which have fairly high U value in Korea are investigated as follows ; double clear glass, double low-e glass, triple clear glass and triple low-e glass. Comparing double clear glass with double low-e glass, triple clear glass and triple low-e glass, simulation results shows that 7%, 8% and 13% saving of total primary energy can be exptected.

섬유 강화 페놀수지 복합재료의 마찰 및 마모특성 개선에 관한 연구

이덕보,박상대,문창권 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.4

This study is focused on friction and wear properties of E-glass fiber/phenolic resin composites with various additive contents. The carbon black, TiO$_2$, natural rubber, and carbon fiber are employed as additives which improve friction and wear properties in reinforced composites. Friction and wear characteristics for individual and combinative additives are measured using circle specimens for the wear test. Optimum molding conditions of E-glass fiber/phenolic resin composites as a friction material are 15 MPa molding press, 30 minute molding time, 15$0^{\circ}C$ molding temperature and 30 wt% glass fiber content. Wear characteristics of combinative additives are superior than those of individual additives. The combinative additives added in 3 wt% carbon fiber are expected to improve friction and wear properties in E-glass fiber/phenolic resin composites.

수분환경에서 열화시 간헐적 건초가 유리섬유 강화 복합재료의 기계적 성질에 미치는 영향

이덕보,박상대,김영운,문창권 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.3

The moisture absorption has influence on the mechanical properties of fiber reinforced composites. In this study, we investigate th effect of degradation in various aqueous environment and intermittent drying on the mechanical properties of E-glass fiber reinforced composites. The tensile strength is measured using strand specimen with 40~50wt. % E-glass fiber content and the fracture surfaces are also observed by scanning electron microscope(SEM). The results show that the decreasing tendency of tensile strength as a function of immersion and drying time are similar to the behavior of samples immersed in aqueous environment.