腰果酚生物基自愈合微胶囊的高效制备工艺研究

The efficient preparation of bio-based microcapsules is of great significance for the development of bio-based self-healing coatings. To solve the issue that traditional petroleum-based surfactants cannot effectively encapsulate biological healing agents such as cardanol-based epoxy resins and curing agents, it is reported that cardanol-based surfactants can be used as an emulsifier in the preparation of microcapsules. Using the solvent evaporation method, bio-based microcapsules with polymethyl methacrylate as the shell have been efficiently prepared. Based on the solvent volatilization mechanism, a hypothesis has been proposed to explain the efficient packaging of cardanol-based emulsifiers. The morphology of the microcapsules was analyzed by scanning electron microscopy, and the stability and size distribution of the microcapsules were analyzed by thermogravimetry and laser particle size analyzer. By systematic optimization of process parameters such as emulsifier concentration, the ratio of core to the wall, stirring speed, and temperature, bio-based microcapsules with controllable particle size, mono dispersibility, and spherical structure were prepared. The results show that the microcapsules prepared at evaporation temperature of 40℃ and core-wall ratio of 1∶1 have better surface morphology, and there are regular effects between emulsifier concentration, stirring speed and average particle size. Moreover, the healing efficiency of the self-healing coating embedded with 20%(mass) bio-based microcapsules reaches 61.25%. The application of bio-based surfactants in the high-efficient preparation of bio-based microcapsules may guide the development of bio-based self-healing coatings and contribute to the replacement of petroleum-based materials with bio-based materials in the coating field.