| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 96 === Organic pigments are used as colourants in paints, plastics, printing inks, and electronics industries. Organic pigments are insoluble in solvent, whereas dyes can easily be dissolved in solvent as uniform coloring agents. The technology of “latent pigments” can crucially improve dispersion process. This technique enables to make the convention pigment into latent pigments with properties similar to dyes which are soluble in organic solvents. The latent pigments can be transformed to the parent pigment by thermal treatment.
The purpose of this study is to improve the recovery yield of making latent pigments. Because the the dispersive stability and chemical modification is an important factor, this study emphasize on the issues of latent pigment recovery yield, product polarity, molecular volume, and dispersive stability in solvents. Three solvents, chloroform, tetrahydrofuran (THF); and Propylene glycol monomethyl ether acetate (PGMEA) have been studied. The relative polarity of three solvents is chloroform＞THF＞PGMEA; the magnitude of molecular volume is PGMEA＞THF＞chloroform; and the degree of dispersive stability is chloroform＞THF＞PGMEA. The results show the recovery yield of Boc-DPP latent pigment increases with fine dispersive stability, high polarity, and low molecular volume of solvent. In addition, the Boc-DPP can be converted back to DPP by thermal process in acrylate resin. After the dispersion procedures, the DPP pigment are found to be well-dispersed in the membrane, and the particle size is about 30~50 nm by FESEM.
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