Abstract： Composite paraffin was prepared by evenly mixed solid paraffin and liquid paraffin with mass ratio of 3∶7. The paraffin-polyurea phase change microencapsules were formed by the method of interfacial polymerization using 2, 4-toluene diisocyanate (TDI) and ethylenediamine (EDA) as monomers, octyl phenol ethoxylates (OP-10) as an emulsifier. DSC curve and heating-cooling curves characterizing energy-storage performance of the composite paraffin were compared. The effect of EDA and TDI mass ratio on the polyurea shell yield was explored. The effect of core-shell mass ratio on particle size, coating efficiency and energy-storage performance of the parraffin-polyurea phase change microencapsules was investigated. The results show that the melting point measured by heating-cooling curves is close to that of DSC curve. The polyurea shell yield approximately linearly increases with the increase of mass ratio of hydrated EDA and TDI. The yield keeps constant until the mass ratio reaches 0.5 ∶1.0. When the core -shell mass ratio is 2.0 ∶1.0, the melting point of the paraffin-polyurea phase change microencapsules is 28.1 ℃, the enthalpy is 58.4 kJ/kg, the coating efficiency is 87.5% , the average particle size is about 4.32 μm, and the particle size distribution is uniform.

Keywords: core -shell structure; paraffin; microcapsule; polyurea; phase change; energy-storage performance

中图分类号：TB34，TQ316        文献标志码：A

文章编号：1008-5548(2015)03-0055-05

DOI:10.13732/j.issn.1008-5548.2015.03.013

收稿日期：2014-03-17， 修回日期：2014-02-25，在线出版时间：2015-06-24。

第一作者简介：罗武生(1972—)，男，博士，高级工程师，研究方向为能源材料的制备、利用以及精密加工。 E-mail ：luowusheng503@163.com。