Abstract: Sodium alginate-paraffin phase change microencapsules were prepared by emulsification method. The effects of emulsifier type, proportion and dosage on morphology of the microcapsules were investigated. The surface morphology, chemical composition and thermal properties of microcapsules were characterized by optical microscope, SEM, FT-IR and DSC, respectively. The results show that emulsion system has greater impact on the formation of microcapsules. When the mixture of Tween-80 and Span-80 with volume ration 6:4 is taken as emulsifier, and the dosage of emulsifier is 0.12 mL/mL, the good spherical shape, small particle size, uniform distribution and good dispersion of microcapsules are obtained, and the loading efficiency is 79.14%. FT-IR spectra show that the microcapsules contain both sodium alginate and paraffin. DSC analysis reveals that the phase transition temperature of microencapsules is 52.69℃ and the latent heat 45.42 J/g.

Key words: emulsifier, phase change microcapsules, sodium alginate, paraffin

摘要： 采用乳化法制备了海藻酸钠-石蜡相变微囊，研究了乳化剂种类、配比和用量对海藻酸钠-石蜡相变微囊形貌的影响，并对微囊表面形态、化学组成和热性能进行了表征. 结果表明，乳化体系对微囊的形成有较大影响，当Tween-80和Span-80以体积比6:4复合作为乳化剂，用量为0.12 mL/mL时获得的微囊球形规整，粒径较小，分布均一，分散性好，且包埋率为79.14%. FT-IR图谱表明微囊中含有海藻酸钠和石蜡，DSC分析结果显示微囊的相变温度为52.69℃，潜热能为45.42 J/g.

关键词: 乳化剂, 相变微囊, 海藻酸钠, 石蜡