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以三聚氰胺-甲醛为囊壁,混合石蜡为芯材,通过原位聚合法合成相变储能微胶囊材料,采用单因素比较法和TEM、FT-IR分析手段研究了乳化剂、pH值和NaCl对相变微胶囊制备的影响。研究表明,乳化剂的种类对微胶囊的合成有着重要的影响;当体系pH值太大时,形成的微胶囊不够坚固,易被渗透,微胶囊化产率较低,而当溶液的pH值太小,酸性太强时,囊壁形成过快,质量不易控制,容易发生团聚和结块现象;在酸催化预聚体缩聚过程中,向体系中加入一定质量比的NaCl,可以得到更坚固的微胶囊材料。研究发现,当乳化剂为OP-10,pH为3.5,并加入NaCl时,密胺树脂成功的包覆上了石蜡芯材,其包裹率为80.4%,所合成的相变微胶囊,呈均匀分散的球形,外形完整,平均粒径为2.5μm,粒度分布比较窄,且具有很好的分散性。
Phase change energy storage microcapsule materials were synthesized by in-situ polymerization using melamine-formaldehyde as the wall and mixed paraffin as core material. The effects of emulsifier, pH and NaCl were studied by single factor comparison and TEM and FT-IR analysis. Effect of Phase Change Microcapsule Preparation. The results show that the type of emulsifier has an important influence on the synthesis of microcapsules. When the pH of the system is too large, the formed microcapsules are not strong enough and easily permeable, and the yield of microcapsulation is low. When the pH of the solution Too small, acidic too strong, the formation of wall too fast, the quality is not easy to control, prone to agglomeration and agglomeration; in the acid-catalyzed prepolymer polycondensation process, to the system by adding a certain mass ratio of NaCl, you can get more solid Microcapsule material. The results showed that when the emulsifier is OP-10, the pH is 3.5 and NaCl is added, the melamine resin is successfully coated with the paraffin core material and the encapsulation ratio is 80.4%. The phase-change microcapsules synthesized are uniform Dispersed spherical shape, complete shape, the average particle size of 2.5μm, the particle size distribution is relatively narrow, and has good dispersion.