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인스트루먼트 패널용 복합 PP수지에 대한 수성 도료의 물성
오우정(Woojeong OH),김억(Ok Kim),전용(Yong Chun) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Physical & chemical properties of waterborne paint for automotive instrument panel were investigated. Two different types of 2K waterborne painting were compared. One is pretreated with flame plasma, the other is blended with chlorinated polypropylene emulsion without any pretreatment. In order for food adhesion of waterborne paint on composite polypropylene (PP) substrate, at least 45mN/m of surface energy was required. Not only flame plasma pretreatment but blending with chlorinated polypropylene emulsion also gave good adhesion properties to composite PP substrate. In all reliability tests, two different waterborne painting satisfied the specification requirement like chemical resistance, weathering, scratch, and heat aging. In odor test of waterborne paint, odor grade was less than that of solventborne paint and degree of odor increased as the contents of volatile organic compounds increased.
인스트루먼트 패널 복합 PP수지용 Primerless 수성도료의 물성
오우정(Woojeong Oh),김억(Ok Kim),전용(Yong Chun),임명혁(Myunghyuk Lim),우지영(Jiyoung Woo) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Physical and chemical properties of primerless waterborne paint for composite polypropylene instrument panel were investigated. Primerless waterborne paint with 30% of polyolefin modified acryl emulsion, 15% of alkyl methacrylate emulsion, 3% of crosslinked polymethacrylate bead, 2% of amide modified polyethylene wax had good adhesion properties onto PP substrate without adhesion promoter and showed better properties on long tenn reliability test. In production line test, IR curing condition was insufficient for waterborne paint due to high latent heat of evaporation and complicated feature of instrument panel. Waterborne primerless paint was sensitive to painting environment compared with solventborne paint.
Physical Properties of In-Mold Coating for Powder Slush Molded Skin
Woojeong Oh(오우정),Ok Kim(김억),Junghwan Lee(이정환),Hyeondon Kim(김현돈),Daeup Kim(김대업),Chulki Min(민철기) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Physical properties of in-mold coating (IMC) for powder slush molded (PSM) instrument panel skin were investigated. To get excellent appearance of skin, optimized IMC and release agent spray conditions were determined, which were 15 ㎝ of distance, at 30 sec of flash off time, and 15-20 microns of IMC thickness. For effective melting of powder, powder slush molding conditions were determined as 240℃ of mold temperature, 4 times of rotation time for slush molding, and 50℃ of initial mold temperature. The reliability test result of IMC satisfied all specification requirements.
인스트루먼트 패널 스킨용 분사성형 폴리우레탄의 물리적 성질
김억(Ok Kim),오우정(Woojeong Oh),전용(Tong Chun) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Physical properties of sprayed polyurethane skin fur instrument panel were investigated. Optimized sprayed PU (poly urethane) composition for instrument panel was determined by reaction speed measurement, which were polyol of 6000 molecular weight and modified MDI (NCO=25%). For making sprayed PU skin, raw material was sprayed from 15cm of distance, at 15 g/min of spraying rate, on 70℃ of mold, with 75℃ of raw material. Sprayed PU skin had lower density· than PVC skin when investigating cross sections of skins using scanning electron microscope (SEM). But the reliability test results satisfied all the specification requirements like scratch, chemical resistance, contamination resistance and fogging. Tensile strength, hardness and elongation of sprayed PU skin were slightly changed during heat aging, but the changing rate was much smaller than those of PVC skin.