Na2SO4·10H2O@SiO2微胶囊的制备及相变过程研究  

Preparation and phase change process of NaSO·10HO@SiO microcapsules

作　　者：李开红 何垒垒 王雪莹[1] 罗清龙 黄雪莉[1,2] LI Kai-hong;HE Lei-lei;WANG Xue-ying;LUO Qing-long;HUANG Xue-li(College of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 830046,China;Key Laboratory of Coal Clean Conversion&Chemical Engineering Process of Xinjiang Uyghur Autonomous Region,Urumqi 830046,China)

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046 [2]新疆煤炭洁净转化与化工过程重点实验室,新疆乌鲁木齐830046

出　　处：《现代化工》2020年第11期98-103,共6页Modern Chemical Industry

基　　金：国家自然科学基金(21766033,21166022)。

摘　　要：以水玻璃为硅源,采用化学沉淀-微波加热法制备了Na2SO4·10H2O@SiO2相变微胶囊。利用FT-IR、XRD、SEM、TEM、DSC对Na2SO4·10H2O@SiO2相变微胶囊进行了分析与表征,同时考察了乳化剂配比、芯壁比、微波加热功率、酸浓度对相变微胶囊形貌和热性能的影响。结果表明,十水合硫酸钠与二氧化硅之间仅存在物理相互作用,制备的微胶囊具有球状核壳结构;当微胶囊的芯壁比为1∶0.5、微波加热功率为260 W、酸浓度为4 mol/L时,制得的相变微胶囊潜热值最大。因芯材和壁材廉价易得、无毒害,该相变微胶囊有望应用于建筑节能领域。Na2SO4·10H2O@SiO2,a microencapsulated phase change material,is successfully fabricated via chemical precipitation combined with microwave heating method by using sodium sulfafe decahydrate as core and sodium silicate as a precursor silica shell.FT-IR and XRD results show that there is only a physical interaction between sodium decahydrate and silica.SEM and TEM results show that the microcapsules have a spherical core-shell structure.DSC analysis shows that the microencapsulated phase change material has the maximum latent heat as the core-shell ratio is 1∶0.5,the microwave heating power is 260 W and the acid concentration of 4 mol·L^-1.The effects of emulsifier ratio on the morphology of microencapsulated phase change material,the effects of core-wall ratio,microwave heating power and acid concentration on the latent heat of that are studied.Due to the availability of core materials and wall materials,which are inexpensive and non-toxic,the microencapsulated phase change material is expected to be applied in the field of energy conservation for buildings.

关 键 词：水玻璃 微波法 相变微胶囊 过冷度 

分 类 号：TK02[动力工程及工程热物理] TQ115[化学工程—无机化工]