石蜡微胶囊的制备及其在隔热腻子中的应用与表征

Preparation of paraffin microcapsule and its application and characterization in thermal insulation putty

采用直接原位聚合法制备了以石蜡为内相的脲醛树脂微胶囊，考察了芯壁比和间苯二酚对石蜡微胶囊相变潜热和平均粒径的影响，制备了基于相变机理的隔热腻子，并表征了其隔热性能．结果表明，随着芯壁比的增加，微胶囊相变潜热增大，达到最大值后降低，而粒径一直增大。间苯二酚的作用是加速囊壁固化，其加入时间需在反应进行到一定程度后，用量应该控制在合适的范围内。石蜡微胶囊能用于制备不饱和聚酯隔热腻子，制出的腻子符合Z0721原子灰标准Q／CYQ310-2006。石蜡微胶囊在腻子中起到了隔热作用，微胶囊含量的降低将会大大降低涂膜的隔热性能。

Microcapsule containing paraffin as an internal phase was prepared by the in situ polymerization of urea-formaldehyde without prepolymerization in this paper. Effects of the core/wall ratio and resorcinol on the enthalpies and average diameters of the paraffin microcapsule were studied, then thermal insulation putties were prepared and their performances were characterized. It showed that the enthalpies of the microcapsules would increase along with the increase of the core/wall ratio firstly and then they would decrease after reaching the maximum, however the average diameters would increase all the time. The function of the resorcinol was to accelerate the solidification of the shells. It should be added after the reaction had being carded out for some time and its dosage must be in a proper range. The thermal insulation putty which accorded with the Z0721 standard of unsaturated polyester putty （Q/CYQ310-2006） could be made by adding paraffin microcapsules which could perform the function of thermal insulation. If the content of the paraffin microcapsules decreased, the thermal insulation capacities would be decreased rapidly.