多功能微胶囊的制备及性能的研究
[Abstract]:A microcapsule is a spherical or other shape microparticle with a core-shell structure, ranging in size from tens of nanometers to several hundred microns, with semi-permeable or hermetic properties, with controlled release, increased material stability, and changes in material volume. Functions such as quality and quality. At present, microcapsules usually have only one kind of special properties. This experiment hopes that by selecting different core and wall materials, we can obtain self-repairing, self-cleaning, heat storage, conductive, self-repairing, self-cleaning, heat storage and conducting, while inheriting the properties of core and wall materials. A microcapsule of two or more properties, such as absorbing, antimicrobial, etc. In this paper, octadecane with phase transition temperature of 28.18 掳C and close to room temperature is chosen as core material, with weak alkali resistance, weak acid resistance, excellent insulation, strong wear resistance and cheap UF resin as wall material. By in-situ polymerization, microcapsules with multistage microstructures, superhydrophobicity, self-cleaning and heat storage and heat release properties were prepared. The temperature and pH value of the prepolymer of urea-formaldehyde resin, the temperature of (Phase Change Material) emulsion, the type of surfactant, the concentration of surfactant and resorcinol were discussed. Effects of stirring speed and stirring time on microcapsules. The optimum conditions for the preparation of microcapsules were as follows: the molar ratio of formaldehyde to urea was 1.9: 1; the reaction temperature was 70 掳C ~ (-1); the pH value was 8.00; and the aqueous solution of polyvinyl maleic anhydride copolymer (EMA) with concentration of 6.6 g / L was used as surfactant. In addition, 4.2 g / L resorcinol (accelerated curing of urea-formaldehyde resin) was added in the formation of microcapsules, The reaction temperature was maintained at 35 掳C, the stirring rate of the dispersed droplet was 600ml / min, and the polymerization speed of 10 min, prepolymer was 300,600 r/min / min, and the curing temperature of urea-formaldehyde resin was 55 掳C and the time was 1 h. By means of optical microscope, scanning electron microscope, X-ray energy spectrometer, Fourier transform infrared spectrometer, thermogravimetric analyzer, contact angle measuring instrument, differential scanning calorimeter and thermal imager, the morphology and thermal stability of microcapsules were studied. Thermal properties, hydrophobicity, self-cleaning properties and heat storage and heat release properties were tested. The results showed that the microcapsules were spherical and had core-shell structure. The average size of microcapsules was 80 渭 m. The surface of the microcapsules was rough with a wall thickness of 150,400 nm;. There were 200 nm nanocrystalline urea-formaldehyde resin particles distributed in the microcapsules to form a multi-stage micro-nano structure. There was no chemical reaction between octadecane and urea-formaldehyde resin in the microcapsule core and there was no free formaldehyde in the microcapsule wall. The octadecane microencapsulation hinders the volatilization of octadecane. The temperature at which octadecane begins to volatilize is raised from 130 掳C to 210 掳C, which enhances the thermal properties of octadecane phase change microcapsules. After 100 cycles, the thermal properties of octadecane microcapsules decrease slightly. The microcapsules have super hydrophobicity, hydrophobic angle more than 160 掳and rolling angle less than 12 掳. After being placed in air for a long time, the hydrophobic angle is still more than 160 掳, the rolling angle is still less than 12 掳, and the microcapsule has good stability at room temperature and atmospheric pressure. In the self-cleaning test, the microcapsules have good self-cleaning performance and can be maintained for a long time by using carbon black and sand. The coating containing octadecane microcapsule can eliminate the influence of temperature change on the coating to a certain extent and keep the temperature at 28.2 掳C. it has good heat storage and heat release properties.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TB34
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