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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.
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.
정동진 ( Jeong Dong Jin ),이애리 ( Lee Ae Li ),유혁재 ( Yu Hyeog Jae ),정충호 ( Jeong Chung Ho ),박홍수 ( Park Hong Su ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.1
N/A Reaction intermediates PCP/BZA (PBI) and tetramethylene bis(orthophosphate) (TBOP) were synthesized from polycaprolactone (PCP) and benzoic acid (BZA) and from pyrophosphoric acid and 1,4-butanediol, respectively. Benzoic acid modified polyesters containing phosphorus (APTB-5, -10, -15) were synthesized by polycondensation of the prepared PBI (containing 5, 10, 15wt% of benzoic acid), TBOP, adipic acid, and 1,4-butanediol. The structure and characteristics of APTBs were examined using FT-IR, NMR, GPC, and TGA analysis. The increase of the amount of BZA in the synthesis of APTBs resulted in decrease in average molecular weight and kinematic viscosity. From the TGA analysis of APTBs, it was found that the afterglow decreased with the amount of BZA content at the high temperatures.