Fabrication And Application Research Of Microcapsules Of Phase Change Materials

Microcapsules phase change material is new type chemical materials which take the use of latent heat of phase change materials. It can absorb and release the energy automatically by their structural or phase changed, which can get the target of regulating the temperature. By using this function, the microcapsules phase change material could applied in the field of building energy conservation, chemical energy saving and military field. Microcapsule phase change material which used in the chemical engineering was developed rapidly.Microencapsulated phase change materials were synthesized using melamine-urea resin as shell and lauryl alcohol,butyl stearate as mixed core by in situ polymerization. The shape, structure and phase transition performance were discussed; By using the method of the industrial coatings, antistatic and thermal control coating for oil tanks was prepared. And the thermal control effect was discussed intensively. The main research content and the results are as follows.1. The emulsification process of mixed-core material was discussed. The particle size distribution of microcapsule was more uniform when the amount of emulsifier is5%of the core material. Different microcapsules were prepared with different emulsifiers. Surface morphology of different phase change microcapsules were observed by Scanning Electron Microsco-pe(SEM). When the emulsifier is OP-10and xanthan gum, the surface morp-hology of microcapsule was neat, density and dispersivity was good. Through the DSC analysis, the latent heat of phase change microcapsules can reach the value of202.3J/g.2. Microcapsulated phase change materials were synthesized using melamine-urea resin as shell and butyl stearate,lauryl alcohol as core, the emulsifier is OP-10and xanthan gum.The microcapsule phase change material were characterized with different means. The optimum process conditions of preparing microcapsule were when core wall ratio is1:1.3, reaction pH is2.5, reaction temperature and time are70℃and2.5h respectively. When the dropping speed is0.5ml/min, the particle size distribution is narrow and more uniform. With SEM and AFM analysis, the results showed that the average particle size distribution of microcapsule is well-distributed, but small amounts of wall material were still exist. The average particle size of microcapsule was about5μm to10μm. 3. The antistatic and thermal control coating was successfully prepared, the thermal control performance was analyzed by using self-designed model equipment. The insulation performance of ordinary epoxy coating is compared, the result shows that antistatic and thermal control coating had obvious insulation performance. The surface resistivity of the coating was measured by adding different amount of antistatic agent. When the dosage of antistatic agent was6%, surface resistivity of the coating was2.2×105Ω, the antistatic effect was optimal. When the dosage of microcapsule phase change materials was4%, the mechanical properties of the coatings are best. In conclusion, the coating is applicable for the inside of oil tanks, which had the thermal control and antistatic effect.