Abstract
It was tried to prepare the biodegradable composite particles by the phase separation method followed by the drying-in-liquid method. The composite particles were made of poly-e-caprolac-tone, quaternary ammonium, carbon black and wax. In the experiment, acetone and water were selected as a good solvent and a poor solvent for poly-e-caprolactone, quaternary ammonium and wax, respectively. The composite particles were prepared by changing the surfactant species and their concentration, the feeding velocity of water and the weight ratio of poly-e-caprolactone with larger molecular weight to one with smaller molecular weight. The composite particles with the inner structure in which carbon black, quaternary ammonium and wax were coated well with poly-e-caprolactone could be prepared by the preparation method presented in this study. The structure and the mean diameter of composite particles were strongly affected by the feeding velocity of water. The higher the feeding velocity of water, the larger the mean diameter of composite particles. The mean diameter was drastically decreased with the surfactant concentration and increased with the added amount of poly-e-caprolactant with larger molecular weight.
Highlights
Many kinds of composite particles have been prepared by various preparation methods and applied in many fields such as information recording materials, paintings, writing materials, adhesive, cosmetics, food industry, medicine and so on [1] [2]
We have adopted the phase separation method followed by the drying-inliquid method to prepare the biodegradable composite particles, in which poly-ε-caprolactone was used as the biodegradable polymer, because poly-ε-caprolactone with lower melting point is pliable and dissolved in acetone of an innoxious solvent
We have tried to prepare the composite particles made of biodegradable polymer, carbon black, quaternary ammonium and wax by the phase separation method followed by the drying-in-liquid operation
Summary
Many kinds of composite particles have been prepared by various preparation methods and applied in many fields such as information recording materials, paintings, writing materials, adhesive, cosmetics, food industry, medicine and so on [1] [2]. It has been tried to develop the preparation method of toner used on the copying press with the green preparing process by using biodegradable materials [13]-[15] In these works stated above, the most important purpose is to develop the simple preparing methods without much energy and noxious volatile solvents. In this study, taking these into consideration, we have tried to develop the simple preparation method without any noxious solvents For this purpose, we have adopted the phase separation method followed by the drying-inliquid method to prepare the biodegradable composite particles, in which poly-ε-caprolactone was used as the biodegradable polymer, because poly-ε-caprolactone with lower melting point The purposes of this study are to investigate whether the biodegradable composite particles could be prepared by the phase separation method [16]-[18] followed by the drying-in-liquid method [1] [19] or not, to establish the optimum operational conditions for preparing the biodegradable composite particles, to characterize the composite particles prepared and to get the fundamental information for application to toner particles
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