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采用硅烷偶联剂,通过溶胶-凝胶法制备以SiO_2为壁材、棕榈醇-棕榈酸-月桂酸为芯材的细粒径SiO_2基棕榈醇-棕榈酸-月桂酸微胶囊相变调湿材料。采用等温吸放湿法、步冷曲线法、激光粒度分析仪(LPSA)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)和差示扫描量热(DSC)分析表征了SiO_2基棕榈醇-棕榈酸-月桂酸微胶囊相变调湿材料的调湿性能、调温性能、粒度分布、组成结构、表面形貌和热性能。结果表明,去离子水用量、无水乙醇用量、硅烷偶联剂用量和棕榈醇-棕榈酸-月桂酸用量对SiO_2基棕榈醇-棕榈酸-月桂酸微胶囊相变调湿材料有重要的影响。当去离子水与正硅酸乙酯的物质的量比为9、无水乙醇与正硅酸乙酯的物质的量比为5、棕榈醇-棕榈酸-月桂酸与正硅酸乙酯的物质的量比为0.5和硅烷偶联剂与正硅酸乙酯的物质的量比为0.1时,SiO_2基棕榈醇-棕榈酸-月桂酸微胶囊相变调湿材料呈球形且表面光滑紧凑,尺寸仅为1680.60~1735.35 nm,粒径分布均匀,分散性较好,具有良好的相变储湿性能。
The phase-change humidity control of fine-grained SiO_2-based palmityl-palmitate-lauric acid microcapsules with SiO_2 as the wall material and with palmityl-palmitate-lauric acid as the core material was prepared by sol-gel method using silane coupling agent material. Isothermal absorption and desorption wet method, step-cooling curve method, laser particle size analyzer (LPSA), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC) The humidity-controlling property, temperature regulating property, particle size distribution, compositional structure, surface topography and thermal property of SiO_2-based palmityl-palmitate-lauric acid microcapsule phase change humidity-controlling material. The results showed that the amount of deionized water, the amount of anhydrous ethanol, the amount of silane coupling agent and the content of palmitol-palmitic acid-lauric acid had an important effect on the phase change humidity-controlling materials of SiO 2 -cyl alcohol-palmitic acid-lauric acid microcapsules . When the ratio of deionized water to tetraethyl orthosilicate is 9, the ratio of anhydrous ethanol to tetraethyl orthosilicate is 5, and the ratio of the content of the substance of the palmitol-palmitate-lauric acid to tetraethyl orthosilicate SiO_2-based palmitic-palmitic acid-lauric acid microcapsule phase-change humidity-controlling material is spherical and has a smooth and compact surface, and the ratio of the amount of substance to 0.5 and the amount ratio of the silane coupling agent to tetraethoxysilane are 0.1, The size is only 1680.60 ~ 1735.35 nm, particle size distribution is uniform, better dispersion, with good phase change moisture storage performance.