摘要
以工业水玻璃为纳米SiO2前驱物,以癸酸(CA)和月桂酸(LA)二元低共熔酸为相变芯材,在表面活性剂的参与下,采用溶胶-凝胶法一步制备出纳米级复合定形相变蓄热材料.利用透射电子显微镜,扫描电子显微镜,傅里叶红外光谱仪,方差扫描量热法和热重分析等测试技术对此定形相变蓄热材料的结构和性能进行分析,并采用瞬态热线法测量了其导热系数.结果表明:相变芯材在吸热熔化后不会产生流动和渗漏;复合相变材料中脂肪酸含量(质量分数)为46%,具有良好的相变蓄热性能(相变温度19.57℃,相变潜热71.28J/g)和热稳定性;复合相变材料导热系数为0.178W/(m.K),可作为一种良好的隔热、保温建筑材料.
A kind of form-stable phase change material（PCM） based on capric-lauric acid eutectic acting as the heat-absorbing material and nano silicon dioxide serving as the supportive material was prepared by sol- gel method. The morphology, chemical characteristics and thermal properties of the composite PCM were investigated by transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, and Fou- rier-transform infrared （FT-IR）, differential scanning calorimetry（DSC） and thermogravimetric analysis （TGA）. The results indicate that fatty acid eutectic can be immobilized in the three-dimensional network structure when the composite PCM is heated to above the CA-LA eutectic in the composite PCM is 46%（by mass）. the composite PCM were determined as 19.57 ℃ and 71. phase change temperature. The proportion of the The phase change temperature and latent heat of 28 J/g, respectively. Mean-while, thermal con- ductivity of the composite was measured to be 0. 178 W/（m K） by using the transient hot-wire method. Thus it can be applied for energy conservation as the thermal insulation material.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2013年第1期91-96,共6页
Journal of Building Materials
基金
"十一五"国家科技支撑计划项目(2006BAJ04A004)
辽宁省教育厅科学研究项目(L2012225)
关键词
水玻璃
脂肪酸低共熔物
溶胶-凝胶法
定形相变材料
保温材料
water glass
fatty acid binary eutectic
sol-gel method
form-stable phase change material （PCM）
thermal insulation material
