| 摘要: |
| 采用溶剂蒸发法制备乙基纤维素包覆环氧树脂的自修复用缓释型微胶囊，探讨芯壁比与温度对微胶囊表面形貌的影响，以及转速与乳化剂质量分数对微胶囊粒径分布的影响，采用环境扫描电子显微镜（ESEM）和傅里叶变换红外光谱仪（FTIR）表征微胶囊表观形貌和化学结构，采用紫外可见分光光度计（UV VIS）表征微胶囊缓释性能．结果表明：当环氧树脂/乙基纤维素的质量比为1∶1、制备温度30℃、乳化剂（明胶）质量分数为5%以及转速为800r/min时，制备的环氧树脂/乙基纤维素微胶囊形貌圆整、表面孔洞较多、粒径分布较窄且主要分布在75～150μm；环氧树脂/乙基纤维素微胶囊具有良好的缓释性能，在0～1h、1～2h和2～3h时段吸光度增加量随着时间的增加而增加，3～4h时段吸光度增加量出现减少，这主要是随着溶解量的增加，乙醇水溶液对芯材溶解速率放缓所致. |
| 关键词: 微胶囊 乙基纤维素 自修复 缓释 |
| DOI：103969/j.issn1007 9629202002023 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51972158,51562024)；江西省杰出青年人才资助计划(20162BCB23014) |
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| Particle Characteristics and Sustained Release Properties of Epoxy Resin/Ethyl Cellulose Microcapsule |
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WANG Xingang, XIA Long, FU Xingguo, XU Wei, WANG Xingjing
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School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
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| Abstract: |
| Self healing sustained release microcapsule of ethyl cellulose containing epoxy resin had been prepared by solvent evaporation method. The effect of core wall ratio and temperature on surface morphology of microcapsule and the effect of rotation speed and emulsifier mass fraction on particle size distribution of microcapsule were investigated. Surface property and chemical structure of microcapsule were characterized by environmental scanning electron microscope(ESEM) and Fourier transform infrared spectrometer spectrometer(FTIR), and sustained release property was tested by ultraviolet and visible spectrophotometry（UV VIS）. The results show that when the core wall ratio is 1∶1, temperature is 30℃, mass fraction of emulsifier gelatin solution is 5% and rotation speed is 800r/min, the prepared epoxy resin/ethyl cellulose microcapsule has a round shape and a large number of pores on the surface. Meanwhile, there is a narrow particle size distribution which is mainly about 75150μm. The epoxy resin/ethyl cellulose microcapsule has good sustained release property. The added value of absorbance increases with increasing time in 01h, 12h and 23h period, but decreases in 34h period. The reason is that the increasing dose of core material dissolved slows the dissolution rate. |
| Key words: microcapsule ethyl cellulose self healing sustained release |
