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以固体石蜡为相变芯材,三聚氰胺-尿素-甲醛共缩聚树脂为囊壁,采用原位聚合法制备了微胶囊型相变储热材料;并针对该相变材料热导率低及亲水性差缺点,用石墨和纳米SiO2对芯材和微胶囊进行了导热性和表面性能的改性研究。采用光学显微镜(OM)、红外光谱仪(FTIR)、差示扫描量热仪(DSC)、热重分析仪(TGA)等对产品的表面形态、化学结构、热性能等进行了测试和表征。结果表明:石蜡微胶囊化后能保持原有的储热特性,相变焓为47.5J/g;球状微胶囊平均粒径为45μm,表面粗糙,石蜡包封率达80%;纳米SiO2改性后微胶囊亲水性、耐热性能、机械强度均增强;石墨改性后导热性提高。
The microcapsule phase change material was prepared by in-situ polymerization using solid paraffin as phase change core material and melamine-urea-formaldehyde co-condensation resin as the wall. The phase change material with low thermal conductivity and hydrophilic property The disadvantage of sexual difference, using graphite and nano-SiO2 core and microcapsules for thermal conductivity and surface properties of the modified study. The surface morphology, chemical structure and thermal properties of the product were tested and characterized by optical microscope (OM), infrared spectroscopy (FTIR), differential scanning calorimeter (DSC) and thermal gravimetric analyzer (TGA) The results showed that the enthalpy of phase transition was 47.5 J / g, the average particle size of spherical microcapsule was 45 μm, the surface was rough and the entrapment efficiency of paraffin wax was up to 80% After the microcapsules hydrophilic, heat resistance, mechanical strength are enhanced; thermal conductivity of graphite modified to improve.