The oleic acid polyester macromer was synthesized from 40 parts of oleic acid, 34 parts of phthalic anhydride and 26 parts of glycerol. It might be copolymerized with MMA in toluene solution using a free radical initiator. The ratio between the macromer and MMA monomer was varied and the effect on the copolymers properties such as the glass transition temperature, molecular weight, thermal stability and film properties were studied. H-NMR spectroscopy was used to provide evidence of the reaction between the macromer and MMA during the copolymerization. Increasing the amount of macromer led to a decrease in the polymerization rate. On the other hand, increasing the amount of MMA leads to increasing molecular weight and higher Tg value. The coating obtained with the highest ratio of MMA exhibited the best overall physico-chemical properties. Results further reveal that the alkali and water resistance improved significantly with the increase in MMA content in the copolymer.
Recently, raw materials such as pigments and the dispersing agents are developed, and a dispersion machine that can crush minutely appears and the dispersion technology provides rapid advancement. It is a basic technology in a variety of industrial fields though this dispersion technology is a sober technical field. In addition, it is an important elemental technology in the science and technology that guides nanotechnology, the environment, and the age of energy etc. of the future. This paper was concisely by aiming to be the introduction of pigment dispersion and had the image of the idea of the pigment dispersion using a conceptual model.
In recent years, the consumption percentage of waterborne paint compared to total paint consumption in Japan has been unchanged. While the shift to waterborne paint is seen more in base and mid coats for car bodies, it is not so progressive in general industrial coating fields. Because of their improved transfer efficiency, electrostatic coatings contribute to savings in paint consumption, which in turn results in cost reduction which has recently become the most important requirement from industry, as well as decreasing VOC and industrial waste. The problem is, however, that waterborne paint, solved by water, has such low electric resistance that electrostatic charge leaks out. To resolve this problem, spray guns specifically designed only for waterborne paint, and other coating equipment with voltage block to shut-off electric charge are now under development. In this paper, coating equipment used in electrostatic systems for waterborne paint for car body coating and general industrial coating are introduced.