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复合有机相变微胶囊的制备与表征

时间:2019-01-25 14:29来源:毕业论文
采用乳液聚合法以MMA(甲醛丙烯酸甲酯)为壁材,以切片石蜡和硬脂酸正丁酯为芯材制备复合相变储能微胶囊。采用生物显微镜、红外光谱、热重分析等测试技术对所制备的相变微胶囊的

摘要:随着科技的进步和人类生活水平的不断提高,人类对能源的需求也越来越大,然而高排放,高污染,高耗能的能源消费方式不只对环境带来了极大的破坏,还导致不可再生能源越来越少以至于面临枯竭。因此节能减排是现在最热点问题,而相变储能技术是利用材料的相变潜热来实现能量的吸收,存储和释放,有效地解决能源供求在时间和空间上的不匹配矛盾,达到有效利用能源和节约能源的效果。相变储能材料中固液相变材料较为广泛研究,用微胶囊技术将相变储能材料使之储热可靠性和稳定性更高;33032
本课题采用乳液聚合法以MMA(甲醛丙烯酸甲酯)为壁材,以切片石蜡和硬脂酸正丁酯为芯材制备复合相变储能微胶囊。采用生物显微镜、红外光谱、热重分析等测试技术对所制备的相变微胶囊的形貌特征、粒径大小、结构组成及热性能进行了分析与表征。讨论了芯壁比,乳化剂的量,HLB值,预聚温度,转速,反应时间等因素对微胶囊包埋率的影响。结果表明:对比BPO和AIBN两种引发剂,AIBN引发剂制备的复合相变微胶囊颗粒比较均匀,粒径相对较小。芯壁比2:1,乳化剂质量在达到油相质量5%、HLB值为10,预聚温度为70℃,反应5个小时的时候得到的微胶囊的包埋率最高,达到60.02%。
毕业论文关键词:相变储能材料,微胶囊,乳液聚合法,复合芯材
Abstract:With the advancement of technology and the continuous improvement of the human condition, the human demand for energy is growing, but high emission, high pollution, high energy consumption of energy on the environment is not only a great deal of damage, but also resulting in fewer and fewer non-renewable energy that is facing depletion. So energy conservation is now the hottest issues, and phase change energy storage technology is the use of phase change material latent heat energy to achieve the absorption, storage and release, effective solution to the energy supply and demand does not match the contradiction in time and space, to achieve effective use of energy and energy saving effect. The solid phase change material phase change material is more extensive research, using microencapsulation technology higher energy storage phase change material heat storage so that the reliability and stability;

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This paper by emulsion polymerization in MMA (formaldehyde methacrylate) as wall material to slice paraffin and stearic acid, n-butyl To prepare composite core material phase change energy storage microcapsules. The use of biological microscopes, infrared spectroscopy, thermal analysis and other testing techniques for morphology of the prepared phase change microcapsules, particle size, composition and thermal properties were analyzed and characterized. Discussed the core wall ratio, the amount of emulsifier, HLB value, the temperature of the prepolymer, the prepolymer affect the time on microencapsulation rate. The results showed that:Core wall ratio 2: highest encapsulation efficiency microcapsules 1, the emulsifier in the oil phase mass reaches 5%, HLB value of 10, the pre-polymerization temperature is 70 ℃, reaction time getting five hours, reaching 60.02%. Compare two BPO and AIBN initiator, AIBN initiator compound prepared by a phase change agent microcapsule particle more uniform, smaller particle size, the average particle size of 1 ~ 2μm.
Keywords: phase change material, microcapsules, emulsion polymerization, composite core material
目录
一、 绪论    1
1.1引言    1
1.2相变材料概述    1
1.2.1相变材料的调温机理    2
1.2.2相变材料的分类    2
1.2.3相变材料的选择    3
1.2.4相变材料的应用    3
1.3相变微胶囊技术简介    4
1.3.1微胶囊技术及相变微胶囊    4 复合有机相变微胶囊的制备与表征:http://www.lwfree.cn/huaxue/20190125/29882.html
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