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지방족 및 방향족 이소시아네이트를 함유하는 PU 난연도료의 도막물성과 난연성 비교
황용현(Yong Hyun Hwang),박홍수(Hong Soo Park),김성래(Sung Rae Kim),박형진(Hyong Jin Park),함현식(Hyun Sik Hahm) 한국유화학회 2002 한국응용과학기술학회지 Vol.19 No.1
N/A Two PU flame-retardant coatings, 2,3-DBPO/N-100 (DBPON) and 2,3-DBPO/IL (DBPOI), were prepared by curing 2,3-dibromo modified polyester (2,3-DBPO) with isocyanate curing agent Desmodur N-100 (or Desmodur IL) at room temperature. The physical properties and flame-retardancy of the two coatings were tested and compared. As a result, the pot-life, yellowness index, lightness index difference, 60˚ specular gloss, cross-hatch adhesion, viscosity, and accelerated weathering resistance of DBPON were better than those of DBPOI; the fineness of grind of the two coatings were the same; and the drying time, hardness, and abrasion resistance of DBPOI were better than those of DBPON. The flame retardancy of the flame-retardant coatings increased with the content of the flame retarding component, 2,3-dibromopropanoic acid (2,3-DBP); and the LOI values of the two coatings were in a range of 27∼29% when the content of 2,3-DBP was 30wt%.
벤조산 유도체 Ⅱ . Furyl Chalcone 유도체의 가수분해 반응메카니즘과 그 반응속도론적 연구
이기창,황용현,류완호,양천회,이석우 ( Ki Chang Lee,Yong Hyun Hwang,Wan Ho Ryu,Cheon Hoi Yang,Seok Woo Lee ) 한국유화학회 1993 한국응용과학기술학회지 Vol.10 No.1
The hydrolysis kinetics of 2-furyl chalcone derivatives [Ⅰ]~[Ⅴ] was investigated by ultraviolet spectrophotometery in 30% dioxane-H_2O at 25℃ and the structure of these compounds were ascertained by means of ultraviolet, infrared and NMR spectra. The rate equations which were applied over a wide pH range(pH 1.0~12.0) were obtained. The substituent effects on 2-furyl chalcone derivatives [Ⅰ]~[Ⅴ] were studied, and the hydrolysis were facilitated by the electron attrecting groups. On the basis of the rate equation, substituent effect, general base effect and final product, the plausible hydrolysis mechanism was proposed: Below pH 4.0, it was only proportional to concentration of hydronium ion, at pH 4.0~9.0, neutral H_2O molecule competitively attacked on the double bond. By contrast, above pH 9.0, it was proportional to concentration of hydroxide ion.
아세트화 아크릴 공중합체 - 올레인산 혼합 에멀젼계 방수제 제조연구
김영근,황용현 ( Young Geun Kim,Yong Hyun Hwang ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.3
EMA-co-DAMA were synthesized form 2-diethylaminoethyl metacrylate and ethylhexyl metacrylate in acrylmonomer. To facilitate water emulsification, acrylic copolymer was cationized by acetic acid to produce acetated acrylic copolymer. The structures of the synthesized copolymer and acetated copolymers were confirmed by IR, NMR, and molecular weight was measure by GPC, and C.H.N elemental analysis. Acetated acrylic copolymers were perfectly emulsified in water and showed increased emulsion stability. Polymer dispersion for cement modifier[(PDCM-PEM) water proof agent of cement for concrete in building construction] was prepared by blending of the guaternized acrylic copolymer syndisized above, sodium silicate, sodium gluconate and oleic acid emulsion. The result with prepared polymer dispersion of cement modifier was examined, and it was found that excellent waterprooffing effect ; Water permeability ratio is 0.50 under the water pressure of 100g/cm^2 and 0.60 under 3kg/cm^2, and water absorption ratio is 0.42∼0.50 and 1.0∼1.02 compressive strength ratio at mixed of water/PDCM-PEM is 50 times.
2-Fluorenylidene chalcone 유도체에 대한 Thioglycolic acid 의 친핵성 첨가 반응에 관한 연구
이기창,이광일,황용현,류정욱,윤철훈 ( Ki Chang Lee,Kwang Il Lee,Yong Hyun Hwang,Jung Wook Ryu,Cheol Hun Yoon ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.1
Fluorenylidene chalcone derivatives were synthesized by condensation. The structure of these compounds were ascertained by means of UV melting point IR and ^1H-NMR spectra. The nucleophilic addition reaction kinetics of Thioglycolic acid to fluorenylidene chalcone was investigate by UV in 20% dioxane-H_2O at 25℃. The rate equation which were applied over a wide pH1.0~13.0 range. On the basis of general base catalysis and sonfirmation of addition reaction product, the nucleophilic addition reaction kinetics of thioglycolic acid to fluorenylidene chalcone were measured by the pH change. From the result of the above caption, a plausible nucleophilic addition reaction mechanism of thioglycolic acid to fluorenylidene chalcone was proposed. These compounds may be used as the starting materials for the preparation of the engineering plastics or the germicide.