Study On The Structure Regulation And Heat Storage Performance Of Phase Change Microcapsule Of Inorganic Shell

Inorganic shell phase change heat storage microcapsule can not only solve the problem of intermittent energy supply and mismatch between supply and demand,but also solve the problem of easy leakage and poor thermal conductivity of phase change heat storage materials.This research mainly paraffin as core material for storing heat,through the different methods for preparation of one and double shell inorganic phase change thermal storage microcapsule,and through the field emission scanning electron microscope（FE-SEM）,Fourier transform infrared spectrometer（FTIR）,differential scanning calorimeter（DSC）,synchronous thermal analyzer（STA）and the coefficient of thermal conductivity tester and other methods on the structure and thermal energy storages were tested and analyzed.Phase change microcapsule with one shell for thermal energy storage（PCMOS-TES） with good impermeability was prepared by sol-gel method with silica generated by tetraethoxysilane（TEOS） hydrolysis as shell.The results showed that PCMOS-TES had a good shell-core structure,the shell thickness was between 230 and 300 nm,and when the stirring rate was 400 r/min and the TEOS dose was 20 ml,the latent heat value was 240.2J·g^-1,the heat loss was 0.2 J·g^-1,and the weight loss temperature was increased by 35 ℃.Phase change microcapsule with double shell for thermal energy storage（PCMDS-TES）was prepared based on PCMOS-TES,modified silica spheres were used as the second shell.The results show that PCMDS-TES can maintain a complete spherical structure,and when the weak acid pH=2 and the core shell mass ratio is 2:1,the weight loss temperature increases by 47 ℃ and the thermal conductivity increases by 129.20%.