以石蜡(PW)和月桂酸(LA)为原料,采用熔融共混法制备了二元复合相变材料。利用步冷法探究了不同配比对PW/LA二元复合相变材料性能的影响,确定了PW/LA共晶体系中PW和LA的质量比为2.8∶7.2时为复合相变材料的共晶点,低共晶温度为34.2℃。以膨胀蛭石(EVM)为定形材料,PW/LA为相变材料制备定形复合相变材料。结果表明:制备定形复合相变材料的最佳条件为搅拌时间66℃,搅拌温度80min,相变材料含量55%;熔化温度和凝固温度分别为34.75℃和30.22℃,相变潜热为120.6J/g;傅里叶红外光谱测试表明EVM-PW/LA没有化学反应发生;热重测试表明EVM-PW/LA的失重区间在210.1～280.2℃,有良好的热稳定性。此定形相变材料在服装等低温领域有广泛的利用价值。
Binary composite phase change materials were prepared by melt blending method using paraffin wax (PW) and lauric acid (LA) as raw materials.The effects of different ratios on the properties of the PW/LA binary composite phase change materials were investigated using the step-cooling method,and the eutectic point of the composite phase change materials was determined to be the low eutectic temperature of 34.2℃ when the mass ratio of PW and LA in the PW/LA eutectic system was 2.8∶7.2.Expanded vermiculite (EVM) was used as the shaped material,and PW/LA was used as the phase change material to prepare the shaped composite phase change material.The results showed that the optimum conditions for the preparation of the shaped composite phase change material were stirring temperature of 66℃,stirring time of 80min,and phase change material content of 55%.The melting temperature and solidification temperature were 34.75℃ and 30.22℃,respectively,and the latent heat of phase change was 120.6J/g.FT-IR spectroscopy test confirmed that no chemical reaction occurred in EVM-PW/LA.Thermogravimetric test indicated that the weight loss range of EVM-PW/LA was between 210.1℃ and 280.2℃,with good thermal stability.This shaped phase change material has a wide range of utilization value in low-temperature fields such as garments.
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基金资助
内蒙古自然科学基金面上项目(2024MS05044);内蒙古自治区科技计划项目(2021GG0253);内蒙古自治区直属高校基本科研业务项目(JY20220110);内蒙古自治区高等学校青年科技英才项目(NJYT24012)
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