细粒径SiO_2基棕榈醇-棕榈酸-月桂酸微胶囊相变调湿材料的制备与性能

Preparation and Properties of SiO_2 Based HexadecanolPalmitic Acid-Lauric Acid Microencapsulated Phase Change and Humidity Controlling Materials with Fine Particle Size

采用硅烷偶联剂,通过溶胶-凝胶法制备以SiO2为壁材、棕榈醇-棕榈酸-月桂酸为芯材的细粒径SiO2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SiO2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SiO2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,SiO2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。

Microcapsules of phase change-and humidity-controlling material were synthesized by sol-gel method with hexadecanol-palmitic acid-lauric acid as core,SiO2 as shell and silaneas coupling agent.Then their performance of humidity controlling and temperature controlling,particle size distribution,composition and structure,surface morphology and thermal properties were characterized by isothermal sorption method,cooling curve measurement,laser particle analyzer（LPSA）,scanning electron microscopy（SEM）,Fourier transform infrared spectroscopy（FT-IR） and differential scanning calorimetry（DSC） respectively.The results show that the amount of deionizedwater,absolute alcohol,hexadecanolpalmitic acid-lauric acid and silane coupling agent had great effect on the properties of the prepared phase change-and humidity-controlling materials.The phase change-and humidity-controlling material of good performance as spherical particles with smooth surface,homogeneous size distribution in a range of 1680.60~1735.35 nm and excellent dispersibility may be synthesized by the following optimal processing parameters：the mole ratio of deionized water totetraethyl orthosilicateis 9,the mole ratio of absolute alcohol totetraethyl orthosilicate 5,the mole ratio of hexadecanol-palmitic acid-lauric acid to tetraethyl orthosilicate 0.5,and the mole ratio of silane coupling agent totetraethyl orthosilicate 0.1.