相变温度可调的导热复合共晶相变材料的制备及性能  

Preparation and properties of thermally conductive composite eutectic phase change materials with adjustable phase change temperature

作　　者：张鑫炎 杨洁 魏忠[1] 杨伟[2] ZHANG Xinyan;YANG Jie;WEI Zhong;YANG Wei(School of Chemistry and Chemical Engineering,Shihezi University,Shihezi 832003,Xinjiang,China;College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]石河子大学化学化工学院,新疆石河子832003 [2]四川大学高分子科学与工程学院,四川成都610065

出　　处：《精细化工》2025年第3期684-691,共8页Fine Chemicals

基　　金：国家重点研发计划项目(2022YFB3806500)。

摘　　要：首先,以十水合硫酸钠(SSD)和十二水合磷酸氢二钠(DHPD)为二元共晶组分,通过物理共混并加入细菌纤维素(BC)、成核剂(硼砂和五水硫代硫酸钠)制备了相变基体材料(SD),考察了m(SSD)∶m(DHPD)对SD相变温度和相变潜热的影响。然后,向由m(SSD)∶m(DHPD)=6∶4制备的SD(记为SD64)中引入不同含量(x,以SD64的质量计,下同)六方氮化硼(h-BN),制备了导热复合共晶相变材料(xBN-SD64)。通过FTIR、XRD和SEM对样品进行了表征,测试了样品的过冷、相分离、热导率和热循环性能,评价了其热管理能力。结果表明,分别加入SSD和DHPD质量3%的硼砂和五水硫代硫酸钠,SD64的过冷度仅为3.4℃;BC的加入消除了SD的相分离;SD可实现相变温度在31.8~35.7℃之间的有效调控。5BN-SD64的热导率从SD64的0.81 W/(m·K)增至1.20 W/(m·K),相变潜热仅从SD64的(205.3±3.3)J/g降至(199.6±4.2)J/g,相变温度维持在(31.2±0.4)℃;经过50次的热循环,其相变潜热保留率为93%。5BN-SD64应用于建筑的热管理能减少模型建筑室内5.6℃的温度波动。Phase change matrix materials(SD)were prepared from physical blending of sodium sulfate decahydrate(SSD),disodium hydrogen phosphate(DHPD),bacterial cellulose(BC)and nucleating agents borax and sodium thiosulfate pentahydrate,with the effect of m(SSD)∶m(DHPD)on phase transition temperature and latent heat of SD analyzed.Thermally conductive composite eutectic phase change materials[xBN-SD64,x is hexagonal boron nitride(h-BN)content,based on the mass of SD64,the same below]were synthesized by introducing h-BN into SD(SD64)prepared with m(SSD)∶m(DHPD)=6∶4,characterized by FTIR,XRD and SEM,analyzed for their properties of supercooling,phase separation,thermal conductivity and thermal cycling,and evaluated for their thermal management capability.The SD64,which were obtained by addition of borax and sodium thiosulfate pentahydrate equivalent to 3%of SSD and DHPD mass,respectively,displayed a subcooling degree of only 3.4℃.The addition of BC eliminated the phase separation of SD,which could effectively control the phase transition temperature between 31.8 and 35.7℃.The thermal conductivity of 5BN-SD64 increased from 0.81 W/(m·K)of SD64 to 1.20 W/(m·K),and the latent heat of transformation only decreased from(205.3±3.3)J/g of SD64 to(199.6±4.2)J/g,while the transformation temperature maintained at(31.2±0.4)℃.After 50 thermal cycles,the latent heat retention rate was 93%.5BN-SD64 could reduce the indoor temperature fluctuation of 5.6℃in a model building.

关 键 词：共晶水合盐 复合共晶相变材料 热管理 氮化硼 热导率 相变温度 建筑化学品 

分 类 号：TB34[一般工业技术—材料科学与工程]