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표면처리에 의한 Carbon Black 의 표면물성변화
이창우,이창일,홍영호,홍인권,장윤호,함영민 ( Chang Woo Lee,Chang Il Lee,Young Ho Hong,In Kwon Hong,Yun Ho Jang,Yeong Min Hahm ) 한국공업화학회 1996 공업화학 Vol.7 No.4
카본블랙은 일반적으로 보강성, 착색성, 내후성, 내화학성 및 전기적 전도성 등의 다양한 특성을 가지고 있으나 매질과의 친화력이 낮아 이용하는데 어려움을 내포하고 있다. 따라서 본 연구에서는 카본블랙의 표면특성을 변화시켜 매질과의 친화력을 향상시키기 위하여 표면에 비교적 많은 기능기를 가지고 있는 channel black은 표면 카르복실기의 수소를 알칼리 금속과 치환하였고, 표면 기능기가 거의 존재하지 않는 furnace black은 질산으로 처리하였다. 이와 같이 표면의 특성을 변화시켜 카본블랙의 물성변화를 측정하고, 수용액 속에서의 분산특성을 연구하여 다음과 같은 결론을 얻을 수 있었다. 표면처리된 channel black의 경우 치환된 금속(Li, Na, K)의 이온반경이 증가함에 따라 입자 표면의 수화도 증가로 인하여 분산성이 향상되었고, 질산처리한 furnace black의 경우 산의 농도 및 반응온도에 비례하여 표면 기능기의 증대를 가져왔으며 반응시간에는 크게 영향을 받지 않음을 알 수 있었다. 또한 전해질 용액에서 pH 변화에 따른 제타전위를 측정한 결과 카본블랙 입자의 표면 전하밀도가 증가하고, 이에 따른 전기적 반발력 증가로 인한 분산성의 향상과 비교적 안정한 계를 이루고 있음을 확인하였다. Carbon Black has various advantageous properties such as reinforcement, tinting, weathering, chemical resistance, electrical resistance, etc., but it has poor affinity in the solution. The purpose of this study is to enhance dispersion in the aqueous solution by altering the surface characteristics. Two different treatments were applied for both channel black and furnace black respectively. Channel black was treated in alkaline solution to replace hydrogen of the carboxyl group with alkaline metal, Li, Na, K. Furnace black has few functional groups, and it was treated with HNO₃to increase the number of functional group on carbon black. It was seen that the substitution of alkaline metal on the surface of channel black enhances the degree of dispersion. Also the higher the acid concentration and reaction temperature, the more the number of some functional groups on the furnace black. Reaction time was not seen to be effective.
초임계 Tetrahydrofuran 상에서 폐타이어의 분해
장석남,이승범,김형진,홍인권 ( S . N . Jang,S . B . Lee,H . J . Kim,I . K . Hong ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1997 No.0
N/A Waste tire was decomposed in supercritical tetrahydrofuran in a 300 ㎖ batch autoclave reactor. The reaction products were examined by GPC and TG/DTA. TG/DTA thermograms of the waste tire and decomposition product were divided into two regions: First region was due to weight loss by decomposition of SBR, and second region by decomposition of low molecular weight. As the pyrolysis temperature increased from 270 to 320℃, and the reaction pressure increased from 3000 to 4000 psi, the molecular weight of extract was decreased. In this study, the optimum temperature and pressure were 300℃ and 3000 psi, respectively.
포스터 발표 - 에너지환경분과 / 화학공정분과 : 초임계 Tetrahydrofuran 상에서 폐타이어의 분해
장석남,이승범,김형진,홍인권 ( S . N . Jang,S . B . Lee,H . J . Kim,I . K . Hong ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3
N/A Waste tire was decomposed in supercritical tetrahydrofuran in a 300 ㎖ batch autoclave reactor. The reaction products were examined by GPC and TG/DTA. TG/DTA thermograms of the waste tire and decomposition product were divided into two regions: First region was due to weight loss by decomposition of SBR, and second region by decomposition of low molecular weight. As the pyrolysis temperature increased from 270 to 320℃, and the reaction pressure increased from 3000 to 4000 psi, the molecular weight of extract was decreased. In this study, the optimum temperature and pressure were 300℃ and 3000 psi, respectively.
반응표면분석법을 이용한 감잎과 엉겅퀴로부터 항산화성분의 추출공정 최적화
이승범 ( Seung Bum Lee ),장현식 ( Hyun Sick Jang ),홍인권 ( In Kwon Hong ) 한국공업화학회 2017 공업화학 Vol.28 No.4
본 연구에서는 항산화성분을 다량 함유하고 있는 천연물로부터 유효성분을 추출하고, 이를 반응표면분석법을 이용하여 추출공정을 최적화하였다. 또한 감잎과 엉겅퀴로부터 추출된 유효성분의 플라보노이드 함량과 폴리페놀 함량을 측정함으로써 유효성분의 기능성을 평가하였다. 추출공정의 독립변수로는 추출시간, 추출온도, 용매의 비율을 설정하였고, 반응치는 수율, 폴리페놀 함량, 플라보노이드 함량을 확인하였다. 감잎의 경우 추출시간(3.1 h), 주정/초순수 부피비(63.4 vol%), 추출온도(54.6 ℃)에서 수율(27.7%), 폴리페놀 함량(33.2 mg GAE/g), 플라보노이드 함량(47.8 mg QE/mg dw)의 최적 결과를 얻었으며, 엉겅퀴의 경우에는 추출시간(2.9 h), 주정/초순수 부피비(40.7 vol%), 추출온도(68.4 ℃)에서 수율(27.0%), 폴리페놀 함량(17.9 mg GAE/g), 플라보노이드 함량(28.8 mg QE/mg dw)으로 예측되었으며, 종합만족도는 71.7%이다. In this study, we extracted an antioxidant from natural products which are known to have a high antioxidant content and also optimized the extraction process by applying a response surface methodology (RSM). In addition, by measuring the total flavonoids and total polyphenols of the active ingredient extracted persimmon leaf and thistle, the functionality of the active ingredient was evaluated. Both ultrapure water and alcohol were used as extraction solvents and the ratio of ultrapure and alcohol, amount of sample, extraction time, extraction temperature were set as independence variables. Also, the yield, total polyphenols, and flavonoids was set as the response. Optimal extraction conditions were as follows; for persimmon leaf, the extraction time = 3.1 h, ratio of alcohol/ultrapure = 63.4 vol%, and temperature = 54.6 ℃ while for thistle the extraction time = 2.9 h, ratio of alcohol/ultrapure = 40.7 vol%, and temperature = 68.4 ℃. Also, the response were as follows; for persimmon leaf, the yield = 27.7%, total polyphenols = 33.2 mg GAE/g, and total flavonoids = 47.8 mg QE/mg dw, whereas for thistle the yield = 27.0%, total polyphenols = 17.9 mg GAE/g, and total flavonoids = 28.8 mg QE/mg dw at the optimal conditions. The overall satisfaction level was 71.7%.