石蜡相变胶囊的制备及其对砂浆储热性能的影响研究

发布时间：2018-05-22 18:09

本文选题：相变材料 + 多孔材料　；参考：《安徽理工大学》2017年硕士论文

【摘要】：随着世界经济的迅猛发展,能源危机的日益加剧,能源短缺问题也逐渐变得突出。为响应我国节能减排和可持续发展战略的要求,降低能源消耗,特别是建筑能源消耗,具有重要的社会意义。相变材料作为一种储能材料,掺入砂浆中可具有一定的吸热储能能力,从而可降低建筑对能量的需求。因此,相变储能材料的研究成为建筑材料领域的一个热点。本文选用石蜡作为研究的相变材料,分析了石蜡的物理、化学和热性能,筛选了两种多孔材料(陶粒和漂珠),并分析了漂珠和陶粒的性能。基于氢氟酸腐蚀的方法,制备了多孔漂珠,分别研究了使用多孔漂珠和陶粒装载石蜡制备石蜡胶囊,以及掺入石蜡胶囊对砂浆性能的影响。使用SEM、DSC和导热系数测定仪等分析方法研究了材料的微观结构和石蜡胶囊的相变特性以及砂浆的储热能力。研究结果表明:1)使用水泥封装后,石蜡陶粒胶囊的密封性好,高温下不会发生泄露;2)石蜡漂珠胶囊掺入砂浆中,对砂浆力学性能影响较小,且可降低砂浆的导热系数和水泥水化温度,并推迟水化温度峰值的出现;3)石蜡漂珠胶囊掺入到砂浆中,能降低砂浆的导热系数,且对砂浆的力学性能影响较小,且研究得到一种制备多孔漂珠的腐蚀工艺。为避免装载在多孔漂珠内石蜡的液化泄露问题,本文还研究了通过溶胶-凝胶法制备SiO2涂层,封堵多孔漂珠孔隙。研究表明:通过溶胶-凝胶法制备SiO2涂层,反应条件温和,漂珠表面的SiO2涂层微观形貌好,表面膜致密。
[Abstract]:With the rapid development of the world economy and the worsening of the energy crisis, the problem of energy shortage is becoming more and more serious. It is of great social significance to reduce energy consumption, especially building energy consumption, in response to the requirements of energy saving and emission reduction and sustainable development strategy in China. As a kind of energy storage material, phase change material can absorb heat and store energy in mortar, which can reduce the energy requirement of buildings. Therefore, the research of phase change energy storage materials has become a hot spot in the field of building materials. The physical, chemical and thermal properties of paraffin were analyzed. Two kinds of porous materials (ceramsite and bleach) were selected, and the properties of adobe and ceramsite were analyzed. Based on the method of hydrofluoric acid corrosion, porous beads were prepared. Paraffin capsules were prepared with porous beads and ceramsite loaded paraffin, and the effects of paraffin on mortar properties were studied. The microstructure of the material, the phase transition characteristics of paraffin capsules and the heat storage capacity of mortar were studied by means of SEM DSC and thermal conductivity analyzer. The results show that after cement encapsulation, paraffin ceramsite capsules have good sealing performance, and no leakage will occur at high temperature. 2) paraffin drifter capsules have little effect on the mechanical properties of mortar. The thermal conductivity of mortar and the hydration temperature of cement can be reduced, and the peak value of hydration temperature is delayed. When the paraffin drifter capsule is added into the mortar, the thermal conductivity of mortar can be reduced, and the influence on the mechanical properties of mortar is little. A corrosion process for preparing porous beads was also studied. In order to avoid the liquefaction and leakage of paraffin embedded in porous beads, the preparation of SiO2 coating by sol-gel method was also studied in this paper. The results showed that the SiO2 coating was prepared by sol-gel method. The reaction conditions were mild, and the SiO2 coating on the bead surface had good microstructure and compact surface film.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB34

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