基于微孔漂珠的相变微胶囊制备及其对砂浆力学和热性能影响  

Preparation of phase change microcapsules based on microporous fly-ash cenosphere and its effect on the mechanical and thermal properties of mortar

作　　者：张家玮[1] 黄玮 黄大建 李旭辉 马建虎 郑永 ZHANG Jiawei;HUANG Wei;HUANG Dajian;LI Xuhui;MA Jianhu;ZHENG Yong(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Materials Science and Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Third Construction Group CO.,LTD.,Lanzhou 730030,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]兰州交通大学材料科学与工程学院,兰州730070 [3]甘肃第三建设集团有限公司,兰州730030

出　　处：《复合材料学报》2023年第8期4703-4719,共17页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52068043);甘肃省建设科技攻关项目(JKR2021-07);甘肃省教育厅:优秀研究生“创新之星”项目(2022 CXZX-602);兰州市人才创新创业项目(2018-RC-57,2019-RC-78)。

摘　　要：为研究基于微孔漂珠的相变微胶囊对砂浆性能的影响,采用真空吸附法,以石蜡为芯材,粉煤灰微孔漂珠为壁材制备复合相变微胶囊,通过等体积代砂法将其加入砂浆中制成相变微胶囊储能砂浆。采用SEM分析复合相变微胶囊的微观形貌,通过DSC和TG表征复合相变微胶囊的热性能,并在此基础上研究复合相变微胶囊的引入对砂浆力学强度及温控性能的影响。结果表明:制备的复合相变微胶囊具有良好的分散性、致密的表面及优异的循环稳定性;复合相变微胶囊的引入使砂浆具备一定的温控性能,当相变微胶囊掺量为30%时,储能砂浆相比基准砂浆峰值温度最高下降2.58℃,峰值温度出现时间延迟90 min;由于漂珠具有良好的力学性能,储能砂浆的强度随微胶囊掺量增加虽有所下降,但仍满足规范要求。微胶囊储能砂浆具有良好的力学性能和优异的温控能力,可应用在建筑中实现控温节能的目的。To investigate the effect of phase change microcapsules on the properties of mortar,we reported the highperformance composite phase change microcapsules using the vacuum adsorption method,where fly-ash cenosphere microporous served as a supporting skeleton and paraffin as a latent heat storage unit.The preparation phase change microcapsules were added to the mortar in equal volume sand substitution method to prepare energy storage mortars.The micro-morphology of the composite phase change microcapsules was analyzed by SEM image,and the thermal properties of the composite phase change microcapsules were characterized by DSC and TG.The influence of the introduction of the composite phase change microcapsules on the mechanical strength and temperature control performance of the mortar was studied.The test results show that the prepared composite phase change microcapsules have good dispersion ability,dense surface,and excellent cycle stability.In addition,introducing composite phase change microcapsules gives the mortar a certain temperature control performance.Compared with the blank mortar,the peak temperature of the energy storage mortar with the phase change microcapsules content of 30%decreased by 2.58℃,and the appearance time of the peak temperature was also delayed by90 min.The mechanical strength of the energy storage mortar decreases slightly with the increase of the microcapsules content,but still meets the standard requirements.The energy storage mortar developed in this study has better mechanical properties and excellent temperature-regulating ability,and it is equally amenable to temperature regulation and building energy conservation.

关 键 词：相变材料 相变储能砂浆 微胶囊 粉煤灰漂珠 微观结构 力学性能 热性能 温控性能 

分 类 号：TU528[建筑科学—建筑技术科学] TB333[一般工业技术—材料科学与工程]