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在超声波的促进作用下,以正硅酸乙酯为溶胶前驱体、硬脂酸为相变组分,经溶胶-凝胶过程制备了硬脂酸/SiO2复合定形相变储能材料。为了研究硬脂酸/SiO2复合定形相变储能材料的制备工艺,考察了不同超声功率对材料制备过程中加强两相传质作用的辅助效果的影响以及不同种类催化剂对材料制备过程中溶胶-凝胶过程的影响,最后确定出具有良好定形效果下材料的最大硬脂酸质量分数为60%。超声辅助酸碱复合催化法制备硬脂酸/SiO2材料具有无需添加助溶剂和表面活性剂、凝胶速度快、方法简便的优点。对硬脂酸/SiO2复合定形相变储能材料进行了FTIR结构表征和DSC、TG热性能及热稳定性测试,产品的相变焓值达91.46J/g,在低于175℃具有良好的热稳定性。
Under the action of ultrasonic wave, stearic acid / SiO2 composite phase change energy storage material was prepared by sol-gel process using tetraethoxysilane as precursor and stearic acid as phase change components. In order to study the preparation process of stearic acid / SiO2 composite shaped phase change energy storage materials, the effect of different ultrasonic powers on the secondary effect of enhancing the two-phase mass transfer in the preparation of materials was investigated and the influence of different kinds of catalysts on the sol- Plastic process, the final determination of a good shape effect of the material under the maximum stearic acid content of 60%. The ultrasonic assisted synthesis of stearic acid / alkali catalyzed synthesis of stearic acid / SiO2 material without the need to add cosolvents and surfactants, gel speed, the advantages of simple methods. FTIR structural characterization, DSC thermal properties and thermal stability of stearic acid / SiO2 composite phase change energy storage materials were carried out. The enthalpy of phase transformation reached 91.46 J / g, Thermal stability.