유리 중공체 마이크로스피어의 高固形分 에폭시 도료 적용 및 특성에 관한 연구

Abstract

Recently paint formulators are facing the challenges of a tougher regulatory environment and standards such as volatile organic compounds(VOC) emission and performance standards of protective coatings(PSPC) that are aggressive and greater market demands. So, innovative raw materials and creative processes can help the paint chemist address these issues and improve related technologies. One of examples in the fields of heavy duty epoxy coatings, high solid and solvent free types of epoxy coatings are alternatives to cut down VOC. To achieve the high solid and solvent free epoxy coatings, which have the same and/or better physical and chemical properties in comparison with general solvent-type coatings, it is recommended to use epoxy resin and amine curing agent with low molecular weight and low viscosity properties. However, it is not easy to meet the targeted properties of the requirement and demand coatings through managing the resin and curing agent only. There should be some kinds of additives, solvents and pigments, which can help to optimize the properties of the coatings. The main purpose of this study is to apply glass hollow microsphere as a special pigment and prove their performances in high solid epoxy coatings, which can help to optimize the properties of the high solid and solvent free coatings. In this study, a high solid epoxy coating, 80% SVR(Solid Volume Content), was formulated based on commercial epoxy resin system, DGEBA - Bisphenol A Type epoxy and DEAPA - Diethylaminopropylamine, and 2 kinds of glass hollow microsphere, which have different particle sizes and densities, were added by 1%wt and 3%wt to evaluate their application and performance in the coatings. The specimens were produced by applying 4 kinds of the 80% solid epoxy coatings. EIS technique was carried out as an assessment accelerated ageing test to evaluate anti-corrosion properties of the specimens. The creepage analysis was conducted to verify the corrosion as a result of accelerated aging tests(Artificial seawater immersion test, NORSOK M501 test and Prohesion test) were also carried out for 10 weeks with a control group. Then, the electrochemical properties were measured by means of Electrochemical Impedance Spectroscopy(EIS). In the results of test, I found the glass hollow microsphere applied high solid epoxy coating had good performances in the accelerated aging tests and improve physical properties in comparison with a control group.