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• Main Authors: Rou-Hua Chen, 陳柔樺
• Other Authors: Hui Chen
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/13842795020312653108

碩士 === 國立中央大學 === 化學工程與材料工程學系 === 104 === In this study, the feasibility of antifouling microcapsules preparation via internal phase separation and soap-free emulsion polymerization was investigated. The biocide, 4,5-dichloro-2n-octyl-3-isothiazolone (DCOIT), with multiple anti-organism characteristic was chosen to be the encapsulation biocide. The microcapsules must have high biocide content, solvent resistance and a particle size less than 5 μ m in order to apply in ship hull coating. Thermogravimetric analysis (TGA), scanning electron microscope (SEM), Fourier-transform infrared spectrometer (FTIR), optical microscope (OM) and dynamic light scattering (DLS)were used to determine the characterization of microcapsules. Cellulose acetate was used as encapsulation matrix in internal phase separation method. The effects of homogeneous time, organic phase concentration and organic phase ratio to morphology and particle size were discussed. The results showed microcapsules with irregular spherical shape and wide distribution particle size in micrometer scale. In soap-free emulsion polymerization method, MMA and St used as monomer and DVB as cross-linking agent. DCOIT was dissolved in monomer and encapsulated by polymerization. One-stage and two stage monomer adding methods were used to prepare microcapsule. In onestage method, the effects of monomer and DCOIT amount were discussed. In two stage method, the effect of monomer ratio, first stage conversion, stop heat time and crosslink density to microcapsule morphology, solvent resistance, biocide content, and release profile were discussed. The microcapsule had uniform spherical shape and particle size 170-417nm. The microcapsule with highest biocide content 29.1% and solvent resistance was prepared by using PS as the core material. The microcapsules release profile showed a steady biocide release in a zero order tendency.