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1액형 폴리우레탄 상도용 자동차 도료 물성 변화에 관한 연구
김재익,남준현,이재우 한국공업화학회 2003 응용화학 Vol.7 No.1
The isocyanate functional group can be blocked through one of the several methods. Commonly, one thinks of a blocked isocyanate as one in which the isocyanate group is reacted with an active hydrogen compound. Oxime blocked isocyanate, particularly using butanone oxime are widely used for cross linking hydroxy-functional resins. For example, Oxime blocked 1,6-diisocyanatohexane and 1-isocyanato-3-aminomethyl-3,5,5-trimethylcyclohexane with a combination of hydroxy-functional acrylic and polylic and polyester resins give etch resistant and mar resistance clear top coats that can be cured at 130℃∼150℃. However, Oxime blocking agent cured catings tend to yellow during curing and exposure. So this paper attempts to reduce yellowing and improve environmental etch resistance (acid rain spotting), scratch trsistance, long term durability etc.
열경화성 아크릴 공중합체 크리어 코트의 내산성 및 내스크래치성
김용호,남준현,이상진,이진국 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.52 No.-
본 연구의 목적은 내산성과 내 scratch성이 강화된 열경화성 acrylic 수지도료의 개발을 목적으로 한 것이다. 열경화성 acrylic 수지는 hydroxylated resin과 urea modified resin의 비율을 60:40, 70:30, 80:20으로 각각 혼합하여 제조하였다. 제조에 사용된 두가지 acrylic 수지의 분자량과 분자량분포는 GPC를 통하여 확인하였다. 경화반응은 melamine 수지의 함량을 40, 35, 30wt% 으로 변화시키면서 진행하였다. 경화 후의 가교도는 soxhlet 추출법으로 gel fraction을 계산하여 결정하였으며 본 연구에서 제조한 9종류의 수지의 gel fraction은 94.0 - 96.0%이었다. 내산성 측정은 GM 과 PPG-Etch 방법을 사용하여 측정하였다. Mar (scratch) resistance 측정은 PPG standard 방법을 사용하여 측정하였으며 melamine 함량이 30wt%인 70:30비율의 수지가 가장 우수하였다. The purpose of this study was to develope the excellent thermosetting acrylic resin paint that had good acid-resistance and scratch-resistance. The thermosetting acrylic resin was prepared with hydroxylated acrylic resin and urea modified acrylic resin at the ratios of 70:30, 65:35 and 60:40 with changing composition. Molecular weight and molecular weight distribution of two kinds of acrylic resins were measured with using gel permeation chromatography (GPC). Crosslinking reaction was operated with changing composition as 40, 35 and 30wt% of melamine resin. The degree of crosslinking after crosslinking reaction was decided with calculating the gel fraction with soxhlet extraction method. Gel fraction of this study was 94.0 - 96.0% in nine kinds of acrylic resins. Acid etch resistance was measured with PPG and GM methods. Mar (scratch) resistance was measured with PPG standard method and the thermosetting acrylic resin was excellent with 30wt% melamine resin in the composition of 70:30 resin.