相变储能复合胶囊的自组装与调控研究

发布时间：2018-04-24 19:54

  本文选题：相变材料 + 十八烷　； 参考：《天津工业大学》2017年硕士论文

【摘要】：相变材料指在特定温度范围内发生相变化过程,能吸收、储存和释放大量的潜热且温度几乎保持不变的材料,相变储能是一种环保、绿色和高效的储能方式。胶囊化是将功能材料通过成膜材料包覆起来制备成微小颗粒,有效解决了相变材料的使用、储存和运输等问题,提高了相变材料的使用效率,拓宽了相变材料的应用领域。相变材料微胶囊具有相变潜热大、储热密度高、性能稳定以及使用寿命长等优点,并且具有双向控温功能,是目前储能领域研究的热点。本论文研究了粒径在0.5 mm～2.0 mm均一可控的相变储能大胶囊。十八烷/海藻酸钙-PAMA相变储能复合大胶囊;采用悬浮聚合工艺制备以聚甲基丙烯酸烯丙酯(PAMA)为囊壁,十八烷为芯材的微胶囊,后采用溶液喷射法分别以海藻酸钙和混合羧基化碳纳米管(CCNTs)为基材包覆微胶囊制备复合相变大胶囊,对胶囊进行测试分析,研究了芯壁比、海藻酸盐和混合CCNTs的海藻酸盐对MicroPCMs和MacroPCMs表面形貌、微观结构和热性能的影响,金属离子络合和加入CCNTs制备的相变复合大胶囊表现出良好的储能和热性能,在储热和调温服装领域的有广阔的前景。十八烷/海藻酸钙-SiO2相变储能复合大胶囊;实验以十八烷作为芯材,海藻酸钠为基材,SiO2用于改性基体并作为微胶囊壁材。研究凝胶-溶胶法正硅酸乙酯水解聚合形成SiO2壁材的条件、原理和过程,无机囊壁增强了有机囊壁材料的热稳定性、致密性和强度。对复合相变大胶囊FTIR、XRD和热分析等测试表明复合过程只存在物理吸附,十八烷和基体及Si02之间没有发生化学反应,形成微胶囊后十八烷和SiO2的晶体结构均未发生改变,形成了粒径均一潜热为140.6 J/g的大胶囊,且随着Si02在壁材中含量的增加,有效的抑制过冷,且具有良好的热稳定性和较大的比表面积,可在微胶囊功能热流体和其他储能领域得到应用。醋酸纤维素相变储能复合微胶囊。本实验是通过溶液喷射法将乳液喷到在170℃的环境中制备以醋酸纤维素为壁材,十八烷为芯材的相变储能微胶囊,并通过戊二醛对微胶囊进行交联处理,制备密封性更好的相变储能微胶囊。醋酸纤维素具有交联网状结构,增加了相变材料的接触面积,对于相变材料的传热和能量的释放起到很好的作用。
[Abstract]:Phase change materials can absorb, store and release a large amount of latent heat and the temperature is almost unchanged. Phase change energy storage is an environmentally friendly, green and efficient energy storage method. Encapsulation is the preparation of micro particles by coating functional materials through film-forming materials, which effectively solves the problems of the use, storage and transportation of phase change materials, improves the use efficiency of phase change materials, and widens the application fields of phase change materials. Phase change materials microcapsules have the advantages of large latent heat storage, high thermal storage density, stable performance and long service life, and have the function of bidirectional temperature control, which is a hot spot in the field of energy storage. In this paper, phase change energy storage capsules with a uniform and controllable particle size of 0. 5 mm~2.0 mm were studied. Octadecane / calcium alginate PAMA phase change energy storage composite large capsules were prepared by suspension polymerization process, using polyallyl methacrylate (PAMA) as capsule wall and octadecane as core material. The microcapsules were coated with calcium alginate and mixed carboxylated carbon nanotubes (CCNTs), respectively. The effects of alginate and alginate mixed with CCNTs on the surface morphology, microstructure and thermal properties of MicroPCMs and MacroPCMs were studied. In the field of heat storage and temperature adjustment clothing has broad prospects. Octadecane / calcium alginate-Sio _ 2 phase change energy storage composite large capsules were used as core materials and sodium alginate as base materials in the experiment. The conditions, principles and processes of hydrolytic polymerization of ethyl orthosilicate to form SiO2 wall by gel sol method were studied. The inorganic wall enhanced the thermal stability, densification and strength of the organic cystic wall material. The results of FTIR XRD and thermal analysis showed that there was no chemical reaction between octadecane and matrix or Si02. The crystal structure of octadecane and SiO2 had not changed after the formation of microcapsule. A large capsule with homogeneous latent heat of 140.6 J / g was formed. With the increase of Si02 content in the wall material, the supercooling was effectively inhibited, and the capsule had good thermal stability and large specific surface area. It can be used in microencapsulation thermal fluid and other energy storage fields. Cellulose acetate phase change energy storage composite microcapsules. In this experiment, phase change energy storage microcapsules with cellulose acetate as wall material and octadecane as core material were prepared by spray emulsion at 170 鈩，

本文编号：1797998