正交试验法研究定形复合相变材料的制备工艺

Study on the preparation technology of composite phase change material by using orthogonal tests

为制备适用于调温纺织品领域的定形相变材料,用溶胶-凝胶法制备了复合相变材料,其中定形材料为以正硅酸乙酯为前驱体通过溶胶-凝胶法制得的二氧化硅凝胶,以月桂酸/十六醇二元低共熔物为相变材料。采用正交试验法研究了溶胶-凝胶法制备复合相变材料的工艺条件。各因素影响复合相变材料的控温能力次序为:酯PCM比>酯水比>pH>反应温度>陈化温度。最佳工艺为:酯水比为1∶8,酯PCM比为1∶2.3,pH为3,陈化温度为85℃,反应温度为60℃。在最佳工艺下制备复合相变材料并用DSC方法对其热性能进行了研究,结果表明,二氧化硅复合相变材料相变温度为34℃,符合服用要求;当相变材料的质量分数为64%时,相变焓可达122.4 J/g。

In order to prepare shape-stabilized phase change material,composite phase change material was prepared by sol-gel.Shape material was obtained by sol-gel with TEOS,in which phase change material was auric acid/cetyl alcohol binary eutectic phase change materials.The results showed that the descending order of the influencing factors： ester-PCM ratio,ester-water ratio,pH,the reaction temperature,aging temperature.The best technology is： the ester-water ratio 1∶8,ester-PCM ratio 1∶2.3,pH 3,aging temperature 85 ℃,the reaction temperature 60 ℃.When composite phase change material was prepared with the best technology,phase transition temperature of composite phase change material is 34 ℃,phase change enthalpy can reach 122.4 J/g when the mass fraction of phase change material is 64%.