방화용 실란트의 내화성 향상을 위한 첨가제로서 팽창흑연의 개질

홍인권 ( In Kwon Hong ),이원재 ( Won Jae Lee ),임현석 ( Hyun Seok Lim ),이승범 ( Seung Bum Lee ) 한국공업화학회 2017 공업화학 Vol.28 No.4

본 연구에서는 방화용 실란트의 첨가제로 사용되는 팽창흑연의 부피팽창률과 경도특성을 개선하기 위해 팽창흑연에 다양한 수지를 코팅한 후 그 특성을 고찰하였다. 수지의 코팅률을 나타내는 평균코팅두께는 수지의 건조속도와 점도의 영향으로 초산비닐계수지 > 아크릴수지 > 우레탄수지 > 수용성라텍스의 순으로 크게 나타났다. 또한 수지의 종류에 따라 코팅된 팽창흑연의 부피팽창률은 우레탄수지 > 수용성라텍스 > 아크릴수지 > 초산비닐계수지의 순으로 컸으며, 경도는 초산비닐계수지 > 아크릴수지 > 수용성라텍스 > 우레탄수지의 순으로 증가함을 알 수 있었다. 이는 코팅처리를 하지 않은 팽창흑연에 비해 부피팽창률은 감소하나 경도가 현저하게 증가되어 방화첨가제로 사용이 가능함을 알 수 있었다. 반응표면분석법에 의한 최적화실험 결과 아크릴수지의 최적코팅 조건은 수지의 첨가량 37.6 wt%과 코팅 교반속도 441.4 rpm이었다. This study was carried out to investigate the volumetric expansion ratio and hardness of expanded graphite after coating with various resins which were used as an additive of fireproof sealant. The coating thickness of the resin, which represents the coating rate, was dependent of the drying speed of the resin and the viscosity of the resin. Therefore the coating thickness was shown as follows: polyvinyl acetate > acrylic resin > urethane resin > water soluble latex. Furthermore, the volumetric expansion ratio was as follows: urethane resin > water soluble latex > acrylic resin > polyinyl acetate and the hardness was as follows: polyvinyl acetate resin > acrylic resin > water soluble latex > urethane resin. This showed that the volume of expansion was reduced by expansion, which was not covered by coating, but significantly increased by increasing hardness and allowed it to be used as a refractory addition. According to the response surface methodology, the optimized addition amount and stirring speed of acrylic resin were 37.6 wt% and 441.4 rpm, respectively.

연구발표논문초록 ( 분리기술 (3) ) : 이산화 탄소 초임계 용매에 의한 콩기름 추출

홍인권(I . K . Hong),노승욱(S . W . Rho),이광순(K . S . Lee),이원홍(W . H . Lee),유기풍(K . P . Yoo) 한국화학공학회 1988 추계학술발표회 Vol.- No.-

비이온성 혼합유화제를 이용한 화장용 크림 유화액의 유화안정성 평가

홍인권 ( In Kwon Hong ),김수인 ( Su In Kim ),박보라 ( Bo Ra Park ),최준호 ( Junho Choi ),이승범 ( Seung Bum Lee ) 한국공업화학회 2016 공업화학 Vol.27 No.5

화장품 제조의 기본원리인 유화과정은 섞이지 않는 두 액체성분에 유화제를 첨가하여 한 쪽의 액체를 다른 쪽의 액체에 분산하여 안정화된 유제를 제조하는 것이다. 이때 사용되는 유화제의 종류에 따라 다양한 화장품을 제조할 수 있다. 본 연구에서는 서로 다른 비이온성 혼합유화제를 이용하여 화장용 크림 유화액을 제조한 후 유화액의 점도변화, 입자 크기 변화, 입자 크기 분포변화 등을 측정하여 안정성을 평가하였다. 실험에 사용된 비이온성 유화제의 HLB 값은 EMU-01 (HLB = 12.9), EMU-02 (HLB = 12.9), EMU-03 (HLB = 12.4), EMU-04 (HLB = 12.5)이다. 4종류의 혼합유 화제 모두 시간이 증가함에 따라 입자 크기가 증가하고 점도가 감소하는 경향을 나타내었으며, 화장품 제조 시 교반 속도가 증가함에 따라 입자 크기는 감소하고 점도는 증가하는 경향을 나타내었다. 그러나 4종류의 혼합유화제를 사용한 유화액 모두 층분리는 일어나지 않아 56일까지의 유화액의 안정성은 확보할 수 있었다. 또한 유화액의 점도는 EMU-01 > EMU-02 > EMU-03 > EMU-04로 크게 측정되었으며, 입자 크기는 EMU-01 ~ EMU-02 > EMU-03 ~ EMU-04로 측정되어 화장용 크림 유화액을 제조할 경우 맞춤형으로 사용이 가능할 것으로 사료된다. Emulsification is a fundamental process of cosmetics manufacture which produces stabilized emulsion by dispersing the liquid from the one side to the other by adding an emulsifier in an immiscible liquid. Various types of emulsifiers can produce various cosmetics. In this study, we evaluated the stability of emulsifier by measuring variations in the viscosity, particle size and particle size distribution. HLB values of nonionic emulsifiers which are used in this paper are 12.9, 12.9, 12.6 and 12.5 for EMU-01, EMU-02, EMU-03 and EMU-04, respectively. All types of emulsions showed an increase in the particle size and a decrease in the viscosity with the time. Also they showed a decrease in the particle size and an increase in the viscosity with respect to increasing the stirring speed. However, the stability of emulsions up to 56 days was secured by observing the non-separation of emulsions. In addition, the viscosity of the emulsions was measured in the order of EMU-01 > EMU-02 > EMU-03 > EMU-04 while the size of particles was measured in the order of EMU-01 ~ EMU-02 > EMU-03 ~ EMU-04. This indicates that our emulsion can be potentially used for preparing a cosmetic facial cream.

증량제 혼합비율에 따른 네온변압기의 열내구성 평가

홍인권 ( In Kwon Hong ),전길송 ( Gil Song Jeon ),이승범 ( Seung Bum Lee ) 한국공업화학회 2015 공업화학 Vol.26 No.4

The physical properties, such as the heat resistance and thermal durability of the temperature difference fatigue resistance should be excellent when preparing an epoxy type resin for a neon transformer housing. In this study, 50 wt% of SiO2 and silica were selected as a reinforcement and diluent filler for epoxy type resins, respectively. Thermal conductivity and thermal stability were measured as the mixing ratio varied upon the particle sizes. The optimal amount of the mixed silica was 50 wt%. Thermal stability was improved with increasing the amount of larger silica particles. The optimal mixing ratio of differently sized silica particles was 28/3 : 14/18 : 8/10 mesh = 1 : 1 : 1. From these results, it is thought that neon transformer is producible which has excellent thermal durability.

재활용 상온아스콘 혼합물의 최적 결합재 개발

홍인권 ( In Kwon Hong ),전길송 ( Gil Song Jeon ),양창배 ( Chang Bae Yang ),이승범 ( Seung Bun Lee ) 한국공업화학회 2014 공업화학 Vol.25 No.4

This study was carried out to design the optimum mixing ratio of aggregate, cyclic aggregate, and binder (moisture, emulsifiedasphalt, and emulsion type additives) and produce recycling cold asphalt paving mixture satisfying site work standard. Thecyclic aggregate satisfying KS F 2572 was collected from waste asphalt by adequate processing. As the moisture content increased,the shearing strength was decreased. The maximum marshall stability was shown at the 3.0 wt% moisture content. So the optimum moisture content was 3.0 wt%. The marshall stability and flow value with the amount of emulsified asphaltwas satisfied in the range of 0.5∼2.5 wt%, and the porosity was satisfied in the range of 0.7∼2.5 wt%. So the optimumamount of emulsified asphalt was 1.6 wt%. The optimum amount of emulsion type additive was 0.1 wt% in the light of marshallstability and degree of saturation of recycling cold asphalt mixture.

열가소성 차선도장에서 반사유리알의 함침특성

홍인권 ( In Kwon Hong ),이창근 ( Chang Geun Lee ),이승범 ( Seung Bum Lee ) 한국공업화학회 2015 공업화학 Vol.26 No.2

Thermoplastic road markings are one of the most widely used road markings in the world. However, the durability of domestic road markings is relatively shorter than that of the global average of, approximately, three years. To overcome it, the conventional thermoplastic road markings were prepared by adding polyolefin and oxidized PE wax to conventional petroleum resin. In addition, the melting viscosity was designed below 500 cP at 220 ℃ as well as the optimum viscosity for spray painting, and embedding ratio of glass beads were controlled about 50∼60% by spraying in an interval of 1 second. Also the glass bead adhesive ratio was improved by reducing the amount of CaCO3 below 40 wt%. The retroreflectivity was tested under four different conditions to evaluate the abrasion resistance of thermoplastic road markings. The retroreflectivity coefficient satisfied the international standard (150 mcd?m-2?lux-1) in this study, and TPRM-7 was determined as an optimal ratio.

감잎, 엉겅퀴, 뉴그린으로부터 플라보노이드성분의 추출

홍인권 ( In Kwon Hong ),박보라 ( Bo Ra Park ),전길송 ( Gil Song Jeon ),이승범 ( Seung Bum Lee ) 한국공업화학회 2016 공업화학 Vol.27 No.3

본 연구에서는 항산화성분 함량이 높다고 알려진 천연물인 감잎, 엉겅퀴, 뉴그린을 이용하여 유효성분을 추출하고 DPPH radical scavening activity와 플라보노이드성분 함량분석을 수행하였다. 추출에 사용된 추출용매로는 초순수와 주정을 이용하였고, 초순수-주정의 비율, 시료의 양, 추출시간, 추출온도 등을 변수로 설정하였다. 각 천연물의 최적추출조건은 추출시간(2.5~3.5 h), 시료의 양은 50 g/L이었고, 주정/초순수의 부피비와 추출온도의 경우 각각 감잎(55~65 vol%, 50~60 ℃), 엉겅퀴(40~50 vol%, 55~65 ℃), 뉴그린(55~65 vol%, 50~60 ℃)으로 나타났다. 또한 추출된 유효성분의 항산화능과 플라보노이드성분 함량분석 결과 감잎 > 엉겅퀴 > 뉴그린 순으로 크게 나타났다. In this study, we extracted active components from thistle, persimmon leaf, and new green which are known to have a high content of antioxidants and also analyzed the 1,1-Diphenyl-2-picrylhydrazyl (DPPH) radical scavening activity and flavonoid content. Both ultrapure water and alcohol were used as extraction solvents and the ratio of both solvents, sample, amunts extraction time, and extraction temperature were varied. The optimal extraction condition of each natural compounds were 2.5~3.5 h of the extraction time and 50 g/L of the sample amount. The optimal ratio of ultrapure water and alcohol and extraction temperature were as follows; persimmon leaf (55~65 vol%, 50~60 ℃), thistle (40~50 vol%, 55~65 ℃) and new green (55~65 vol%, 50~60 ℃). In addition, the antioxidant capacity and flavonoid content of the extract increased in the order of persimmon leaf, thistle, and new green.

초음파가 도입된 용매추출공정에서 에너지 밀도 분석

이승범 ( Lee Seung Beom ),이승문 ( Lee Seung Mun ),홍인권 ( Hong In Gwon ) 한국공업화학회 2003 공업화학 Vol.14 No.7

유지종의 추출공정에는 여러 가지 용매추출법이 사용되고 있다. 본 연구에서는 초음파 에너지가 도입된 추출공정과 증류나 용매추출을 이용한 공정의 최적 추출조건에서 추출특성과 초음파 에너지 밀도 영향에 따른 추출특성을 분석하였다. 초음파의 조사시간은 1, 3, 5, 10, 20, 30 min이고, 추출공정에서 온도변수로 293.15, 303.15, 313.15 K가 적용되었으며, 초음파의 세기는 390 W부터 520 W로 65 W의 간격으로 변화를 주었다. 또, 초음파 세기에 따른 초음파 에너지 밀도는 측정하였으며, 온도와 시간에 따른 초음파 에너지 영향에 대해서도 해석하였다. 초음파의 조사시간과 초음파 세기 증가에 따라 유지의 추출량도 증가하는 경향을 보였으며, 유지 추출공정을 도입하므로써 단순 용매추출공정에 비해 추출조작시간이 크게 단축 되었다. 초음파의 세기가 증가됨에 따라 초음파 에너지 밀도는 증가하는 경향을 나타내었으며, 온도증가에 따라 초음파 에너지 밀도는 감소하는 경향을 보였다. Most of the oils were extracted through distillation and solvent extraction processes. In this study, the characteristics of oil extraction process from rice bran were evaluated in an optimum operating condition by comparing the ultrasound assisted solvent extraction(UASE) process to the distillation and the solvent extraction processes. And UASE process was studied in terms of the ultrasonic energy density effects and the extraction yield. Then, the ultrasonic irradiation time was varied as 1,3,5,10,20 and 30 min and the extraction temperature was set at 293.15, 303.15, and 313.15 K. The ultrasonic power was varied in the range of 390 to 520 W. The energy density was evaluated in terms of the ultrasonic intensity, the ultrasonic irradation effects with the temperature and irradiation time were analyzed. The extraction amount of rice bran oil was increased with ultrasonic irradiation time and ultrasonic power. The irradiation time ultrasonic extraction process was very shorter than the previous extraction processes. The ultrasonic energy density was proportional to the irradiation power, but the energy density was inversely proportional to the operating temperature.

마이크로웨이브 에너지를 이용한 현미유 추출공정 평가

이승범(Lee Seung Bum),이경모(Lee Kyung Mo),박경애(Park Kyung Ai),홍인권(Hong In Kwon) 한국공업화학회 2000 공업화학 Vol.11 No.1

N/A

황산구리 용액으로부터의 구리회수공정에서 초음파에 의한 전착반응의 증대효과

윤용수,홍인권,이재동,정일현 ( Yoon Yong Soo,Hong In Kwon,Jae Dong Lee,Jeong Il Hyun ) 한국공업화학회 1994 공업화학 Vol.5 No.2

본 연구에서는 초음파의 Cavitation에 의한 혼합효과와 표면세정 효과 그리고 유효 충돌빈도의 중가효과를 이용하여 구리이온을 함유한 용액으로부터 전착반응에 의한 구리의 회수공정에서 전착반응속도를 증가시키고자 초음파 진동자를 직접 반응기 벽면에 부착시킨 반응기를 제작하였다. 초음파 반응저에서 과전압과 황산구리의 농도를 변수로 하여 반응시간에 대한 전류밀도를 측정하고, 음극에 석출된 구리의 양에 의하여 초음파에 의한 반응속도 증가효과에 대하여 연구한 결과 초음파에 의한 효과는 과전압이 2.1V, 황산구리의 농도가 0.1M일 때 석출된 구리의 양이 초음파를 가하지 않은 반응기에 비하여 최고 582.2%까지 증가하였으며, 전류밀도는 최고 277.8% 증가하였다. 또한 전류밀도와 구리 석출량의 증가를 확산충의 두께 감소에 의한 증가효과와 표면세정과 유효충돌빈도의 증가에 의한 효과로 나누어 해석한 결과 초음파에 의한 확산충의 두께 감소로 인한 총괄 반응속도 증가율은 과전압이 2.2V, 황산구리의 농도가 0.1M일 때 최고 277.8%로 나타났으며, 표면세정과 유효 충돌빈도의 증가로 인한 총괄 반응속도 증가율은 과전압이 2.1V, 황산구리의 농도가 0.1M일 때 최고 253.6%로 나타났다. In this study, the ultrasound which provides the properties of mixing, and surface cleaning effect, the increase of the effective reaction surface area and the enhancement of the effective collision frequency, was used to enhance the recovering efficiency of Cu from the Cu-ion containning waste water. The ultrasonic reactor used in this study was designed and constructed for improving the disadvantage of the existing ultrasonic reactor. From the experimental result and its analysis, we obtained following conclusions. 1. The ultrasound increased the rate of electrochemical deposition to 582.2% in maximum at the condition of 0.1M-CuSO_4 and 2.1 V-overpotential. 2. The enhancement effect of ultrasound induced by the reduction of diffusion layer thickness was 277.8% in maximum and induced by the other effect except for the reduction effect of the diffusion layer thickness was 253.6% in maximum at 0.1M-CuSO_4 and 2.1V overpotential. 3. This study gave the possibility of the scale-up of ultrasonic reactor and in particular, ultrasonic reactor would be effective in the treatment of waste water containing a low concentration of Cu ion.