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以SiO2为载体材料、以脂肪酸为相变材料、以无水酒精和去离子水为溶剂,用溶胶-凝胶法制备脂肪酸/SiO2复合相变材料,用SEM、LPSA、FT-IR、DSC等手段对其表征,研究了芯材种类、相变材料用量、无水酒精用量、去离子水用量、溶液pH值、超声波功率等因素对脂肪酸/SiO2复合相变材料织构的影响。结果表明,脂肪酸/SiO2复合相变材料织构受到芯材种类、相变材料用量、无水酒精用量和去离子水用量的影响较大,也与溶液pH值和超声波功率有关。其最佳工艺参数为:癸酸-棕榈酸为芯材、癸酸-棕榈酸与正硅酸乙酯的物质的量比为0.4、无水酒精与正硅酸乙酯的物质的量比为5、去离子水与正硅酸乙酯的物质的量比为9、溶液pH值4和超声波功率为200W。
SiO2 / SiO2 composite phase change material was prepared by sol-gel method using SiO2 as carrier, fatty acid as phase change material, anhydrous alcohol and deionized water as solvent, and SEM, LPSA, FT-IR and DSC The effects of the type of core material, the amount of phase change material, the amount of anhydrous alcohol, the amount of deionized water, the pH value of the solution and the ultrasonic power on the textures of the fatty acid / SiO2 composite phase change material were studied. The results show that the texture of the fatty acid / SiO2 composite phase change material is greatly influenced by the type of core material, the amount of phase change material, the amount of anhydrous alcohol and the amount of deionized water, and is also related to the solution pH and ultrasonic power. The optimum technological parameters are as follows: capric acid-palmitic acid as the core material, the ratio of the amount of capric-palmitic acid to tetraethyl orthosilicate is 0.4, the amount ratio of anhydrous alcohol to tetraethoxysilane is 5, deionized water and tetraethyl orthosilicate material ratio of 9, the solution pH 4 and ultrasonic power of 200W.