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이애리 ( Lee Ae Li ),김성래 ( Kim Seong Lae ),함현식 ( Ham Hyeon Sig ),박홍수 ( Park Hong Su ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.4
N/A Organic acid salt of fatty polyamide (DDDT) and acrylate of fatty carbamide (DDTCA) were synthesized as a main component for the softener. O/W type non-ionic softener (NSC) was prepared by blending DDDT and DDTCA with beef tallow, lanolin anhydride, polyoxyethylene(7) stearyl ether, and polyoxyethylene(50) oleyl ether. After treatment of NSC to all cotton fabrics, the physical properties such as tear strength, crease recovery, and flexing abrasion resistance were measured. As a result of the measurement, NSC was proved to be durable non-ionic softener with good softness.
인 함유 벤조산 변성폴리에스테르와 HDI-Trimer에 의한 PU 난연도료의 제조 및 도막물성
이애리 ( Lee Ae Li ),유혁재 ( Yu Hyeog Jae ),정동진 ( Jeong Dong Jin ),함현식 ( Ham Hyeon Sig ),박홍수 ( Park Hong Su ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.1
N/A PU flame-retardant coatings (APHD) containing phosphorous were prepared by blending of hexamethylene diisocyanate-trimer, white pihment, dispersing agent, flowing agent , and previously prepared benzoic acid modified polyester (APTB) that contains phosphorous. Physical properties of the prepared APHD were examined. With the introduction of BZA (contained in APTB) the film viscosity and film hardness of APHD decreased. With the introduction of caprolactone group, the flexibility, impact resistance, accelerated weathering resistance of APTBs increased. Flame retardancy of the coatings was tested. In a vertical burning method, APHD shows 210~313 seconds, and in a 45?Meckel burner method, shows 1.3~4.0㎠ of char length, which indicates that the coatings are good flame-retardant coatings. Moreover, the amount of afterglow and flame retardancy of the coatings are decreased with increasing BZA content.
도전성 카본블랙/PVdF 복합재의 제조 및 전기적 특성
김명찬 ( Kim Myeong Chan ),문승환 ( Mun Seung Hwan ),임재석 ( Im Jae Seog ),함현식 ( Ham Hyeon Sig ),박홍수 ( Park Hong Su ),김명수 ( Kim Myeong Su ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.3
N/A Electrical properties of carbon filler/PVdF {poly(vinylidene fluoride)}composite were investigated as a funtion of carbon filler/PVdF ratio in the range of 0.2~0.5. Three kinds of comercialzied conductive carbon blacks such as Hiblack 41Y, KE300J, and KE600J, and carbon nanofibers prepared by the catalytic chemical vapor deposition of C_(2)H_(4) over Ni-Cu catalysts were in the range of 0.65 to 13.5 S/cm depending the fillers` electrical conductivity ranging from 5.6 to 23.1 S/cm. Among the carbon fillers used, the KE600J carbon black showed the highest conductivity both in the composite and filler itself because of its high degree of graphitization due to the high-temperature thermal treatment and its high surface area due to the activation treatment.
Acetoacetoxy기 함유 하이솔리드 도료용 아크릴 수지의 합성
유혁재 ( Yu Hyeog Jae ),정동진 ( Jeong Dong Jin ),정충호 ( Jeong Chung Ho ),함현식 ( Ham Hyeon Sig ),박홍수 ( Park Hong Su ),김태옥 ( Kim Tae Og ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.3
N/A A copolymer (HSAs: EA/EMA/2-HEMA/AAEM) which is an acrylic resin containing 70% solid content was synthesized by the reaction of monomers, including ethyl acrylate, ethyl methacrylate, and 2-hydroxyethyl methacrylate with a functional monomer, such as acetoacetoxyethyl methacrylate, which may give improvements in cross-linking density and physical properties of films. The physical properties of prepared acrylic resins, HSA containing AAEM, are as follows : viscosity, 203~550cps ; M_(n), 2590~2850 ; and conversion, 82~89%, respectively. It was found from the plotting of T_(g) versus viscosity and T_(g) versus molecular weight that viscosity increased with T_(g), while number averaged molecular weight decreased with increasing T_(g).
Acetoacetoxy기 함유 아크릴수지와 HDI-Trimer에 의한 하이솔리드 도료의 도막물성
유혁재 ( Yu Hyeog Jae ),정동진 ( Jeong Dong Jin ),함현식 ( Ham Hyeon Sig ),박홍수 ( Park Hong Su ),김성길 ( Kim Seong Gil ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.3
N/A The high-solid coatings were prepared by blending the synthesized acrylic resin in the previous paper and hexamethylene diisocyanate-trimer and curing it at room temperature. The characterization of the films of the prepared coatings was performed. The impact resistance, 60˚ specular gloss, cross-hatch adhension, and heat resistance of the films proved to be good, and the pencil hardness and drying time proved to be slightly poor. Especially, there was a remarkable improvement in the heat resistance. This improvement may stem from the regular arrangement of ethyl groups introduced into the acrylic resin. From a viscoelastic measurement using a rigid-body pendulum, curing was accelerated with the T_(g) value. With the increase in T_(g), log damp value was lowered and dynamic viscoelasic T_(g) of a cured film was increased.
고정층 반응기에서 합성가스 생성에 미치는 반응온도와 반응물 유속의 영향
김상범 ( Kim Sang Beom ),김영국 ( Kim Yeong Gug ),황재영 ( Hwang Jae Yeong ),김명수 ( Kim Myeong Su ),함현식 ( Ham Hyeon Sig ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.1
N/A The effects of reaction temperature and flow rate of reactants on the methane conversion, product selectivity, product ratio, and carbon deposition were investigated with 13wt% Ni/MgO catalyst. Reaction temperatures were changed from 600 to 850℃, and reactants flow rates were changed from 100 to 200 mL/mim. There were no significant changes in the methane conversion observed in the range of temperatures used. It is possibly stemmed from the nearly total exhaustion of oxygen introduced. The selectivities of hydrogen and carbon monoxide did not largely depend on the reaction temperature. The selectivities of hydrogen and carbon monoxide were 96 and 90% respectively. Carbon deposition observed was the smallest at 750℃ and the largest at 850℃. It is found that the proper reaction temperature is 750℃. the best reactant flow rate was 150 ml/min.
총설 : 니켈담지촉매에서 합성가스 제조시 La 조촉매의 영향
황재영 ( Hwang Jae Yeong ),김영국 ( Kim Yeong Gug ),임연수 ( Im Yeon Su ),박홍수 ( Park Hong Su ),함현식 ( Ham Hyeon Sig ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.1
N/A The effect of La promoter on the carbon deposition and catalytic activity in the synthesis gas production with supported Ni catalysts was investigated. Active component was Ni and support was CeO_(2) and the promoter used was La. The reaction was carried out in a fixed reactor at 1 atm and 650~800℃. The catalysts were prepared by two methods, the impregnation method and urea method. The catalysts prepared by the urea method showed 10 times higher surface area than those of prepared by the impregnation method. By the introduction of La promoter in the catalyst system, carbon deposition was remarkably reduced from 16% to 2%. It appears that the promoter facilitates the formation of a stable fluoride-type phase, which reduces the carbon deposition. The best atalytic activity and CO and H_(2) selectivities were obtained with 2.5wt% Ni/Ce(La)Ox catalyst at 750℃, giving 90% methane conversion, 93 and 80% of CO and H_(2) selectivities, respectively.
김상범 ( Kim Sang Beom ),박은석 ( Park Eun Seog ),천한진 ( Cheon Han Jin ),김영국 ( Kim Yeong Gug ),김명수 ( Kim Myeong Su ),박홍수 ( Park Hong Su ),함현식 ( Ham Hyeon Sig ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.3
N/A Syntheses gas is commercially produced by a steam reforming process. However, the process is highly endothermic and energy-consuming. Thus, this study was conducted to produce syntheses gas by the partial oxidation of methane to decrease the energy cost. Supported Ni catalysts were prepared by the impregnation method. To examine the activity of the catalysts, a differential fixed bed reactor was used, and the reaction was carried out at 750~850℃ and 1 atm. The fresh and used catalysts were characterized by XRD, XPS, TGA and AAS. The highest catalytic activity was obtained with the 13wt% Ni/MgO catalyst, with which methane conversion was 81%, and H_(2) and CO selectivities were 94% and 93%, respectively. 13wt% Ni/MgO catalyst showed the best MgNiO_(2) solid solution state, which can explain the highest catalytic activity of the 13wt% Ni/MgO catalyst.
김상범 ( Kim Sangbeom ),박은석 ( Park Eun Seog ),천한진 ( Cheon Han Jin ),김영국 ( Kim Yeong Gug ),임연수 ( Im Yeon Su ),박홍수 ( Park Hong Su ),함현식 ( Ham Hyeon Sig ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.4
N/A Synthesis gas is produced commercially by a steam reforming process. However, the process is highly endothermic and energy intensive. Thus, this study was conducted to produce synthesis gas by the partial oxidation of methane to cut down the energy cost. Supported Ni catalysts were prepared by the impregnation method. To examine the activity of the catalysts, a differential fixed bed reactor was used, and the reaction was carried out at 750~850℃ and 1 atm. The fresh and used catalysts were characterized by XRD, XPS, TGA and AAS. The highest catalytic activity was obtained with the 13wt% Ni/MgO catalyst, with which methane conversion was 81%, and H_(2) and CO selectivities were 94% and 93%, respectively. 13wt% Ni/MgO catalyst showed the best MgNiO_(2) solid solution state, which can explain the highest catalytic activity of the 13wt% Ni/MgO catalyst.