基于多尺度孔结构的保温隔热涂层的导热系数与导热模型  

Thermal Conductivity and Thermal Conductivity Modeling of Insulating Coatings Based on Multi-scale Pore Structures

作　　者：成保拓 吴仲岿[1,2] 潘伟斌 孙其勋 陈嘉琪 Cheng Baotuo;Wu Zhongkui;Pan Weibin;Sun Qixun;Chen Jiaqi(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Hainan Institute of Wuhan University of Technology,Sanya,Hainan 572025,China)

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]武汉理工大学海南研究院,海南三亚572025

出　　处：《涂料工业》2022年第12期9-13,18,共6页Paint & Coatings Industry

基　　金：面向海洋建筑保温应用的隔热保温涂料结构设计与研制(2020KF0027)。

摘　　要：以水性丙烯酸酯乳液为成膜物质,以二氧化硅气凝胶(SA)与空心玻璃微珠(HGB)为隔热填料,同时引入纳米孔和微米孔,制备了具有多尺度孔结构的保温隔热涂料。通过热常数分析仪测量不同SA、HGB体积比的涂层的导热系数。结果表明:涂层的导热系数与SA、HGB的体积比密切相关。涂层的导热系数随填料体积分数的增加而减小,当填料体积分数为70%,SA与HGM体积比为8∶2时,涂层导热系数最低为0.053 W(/m·K)。使用并联模型、串联模型、Maxwell模型、H-C模型对SA/HGM保温隔热涂层的导热实验数据进行拟合,发现当填料体积分数为30%时,涂层导热系数可以用Maxwell模型进行预测;当填料体积分数为50%和70%时,需要考虑涂层中开放孔隙的影响,涂层导热系数可以用基于Maxwell模型的修正模型进行预测。A water-based acrylate emulsion was used as the film-forming substance and silica aerogel(SA)and hollow glass beads(HGB)were used as thermal insulation fillers(while introducing nanopores and micropores)to prepare a thermal insulation coating with multiscale pore structure.The thermal conductivity of the coatings with different volume ratios of SA and HGB was measured by the thermal constant analyser.The results showed that the thermal conductivity of the coatings was closely related to the volume ratio of SA and HGB.The thermal conductivity of the coatings decreased with the increase of the total volume fraction of fillers,and when the total volume fraction of filles was 70%and the volume ratio of SA to HGM was 8∶2,the lowest thermal conductivity of the coatings was 0.053 W(/m·K).Experimental data on the thermal conductivity of SA/HGM insulation coatings were fitted using parallel,series,Maxwell and H-C models.It was found that when the total volume fraction of fillers was 30%,the thermal conductivity of the coating could be predicted using the Maxwell model;when the total volume fraction of filler was 50%and 70%,the effect of open pores in the coating needed to be considered and the thermal conductivity of the coating could be predicted using a modified model based on the Maxwell model.

关 键 词：保温隔热涂料 二氧化硅气凝胶 空心玻璃微珠 多尺度孔结构 导热系数 模型 

分 类 号：TQ637.6[化学工程—精细化工]