乳化剂用量对微胶囊相变材料的影响

摘要：乳化剂是能够改善乳浊液中各种构成相之间的表面张力，使之形成均匀稳定的分散体系或乳浊液的物质。乳化剂是表面活性物质，分子中同时具有亲水基和亲油基，它聚集在油/水界面上，可以降低界面张力和减少形成乳状液所需要的能量，从而提高乳状液的能量。微胶囊相变材料的研究是将微胶囊技术应用到相变材料中而形成的新的研究领域。从技术上克服了相变物质的应用局限性,提高了相变材料的使用效率,拓宽了相变材料的应用领域,具有广阔的应用前景。通过乳化剂浓度的不同来进行实验，利用数显恒温水浴锅、三嘴烧瓶、恒温磁力搅拌器等进行一系列实验，最终在不同乳化剂浓度作用下48720

得到的样品，最后通过观察高倍放大镜和微胶囊红外光谱图分析可以发现，当乳化剂浓度为5%时微胶囊形态和性能均处于最佳状态。

毕业论文关键词：乳化剂微胶囊相变材料

Effect of the Amount of Emulsifier on the Phase Change Materials of Micro Capsules

Abstract: All of emulsifier molecules containing hydrophilic and lipophilic two functional groups, hydrophilic group to attract water and lipophilic group can surrounded by oil. Therefore, the addition of emulsifier in oil water system, water and oil can be mixed with each other, forming a completely dispersed emulsion. However, emulsifier hydrophilic and oleophilic properties are generally not balanced and their applicable occasions are also different, the general, emulsifier and strong hydrophilic applicable to O / W emulsion, oily strong Pro emulsifier used in W/O emulsion.

Microcapsule phase change material is a new type of composite phase change material with core-shell structure, which is formed by the micro encapsulation technology in the solid liquid phase change material particle surface coating layer with stable performance. Micro encapsulated phase change materials in the transformation process, phase change material as the kernel of the solid-liquid phase transition, and the outer layer of the polymer film always keep to a solid state, so the kind of phase change materials will be at the macro has been solid particles. The micro encapsulated phase change material has the following properties: (1) the stability of the traditional PCM is improved. Such as the traditional PCM stability is poor, easy to occur the phenomenon of cold and phase separation. After the formation of micro capsules, these deficiencies will be improved as the capsule particles become smaller and smaller. (2) enhanced the heat transfer performance of traditional PCM. Micro PCMS tiny particles and thin wall (0.2 ~ 10 ^ m ^ m), improve the heat transfer efficiency and the use of PCM. (3) improve the processing performance of traditional PCM. Micro encapsulated phase change material particles are tiny, uniform particle size, easy to mix with a variety of polymer materials to form a more superior performance of composite phase change materials.

Keywords: Emulsifier；Micro capsule；Phase change material

摘要 i

Abstract i

目录 iv

1 绪论 1

1.1 课题研究背景 1

1.1.1 乳化剂国内发展现状 1

1.1.2 乳化剂国外发展现状 1

1.1.3 微胶囊相变材料现状 2

1.2 乳化剂 2

1.2.1 乳化剂的应用 2

1.2.2 乳化剂的应用领域乳化剂用量对微胶囊相变材料的影响:http://www.751com.cn/cailiao/lunwen_51403.html