采用溶胶-凝胶法制备棕榈醇棕榈酸月桂酸/SiO2复合材料。利用响应面法研究了无水乙醇用量、去离子水用量以及棕榈醇棕榈酸月桂酸用量对棕榈醇棕榈酸月桂酸/SiO2复合材料热湿综合性能的影响,并对棕榈醇棕榈酸月桂酸/SiO2复合材料的制备工艺参数进行了优化。结果表明,各因素对性能影响的主次顺序为：无水乙醇用量>棕榈醇棕榈酸月桂酸用量>去离子水用量；在本研究的各参数范围内,优化方案是无水乙醇用量(与正硅酸乙酯的物质的量比)为9.11、去离子水用量为5.21、棕榈醇棕榈酸月桂酸用量为0.52。优化棕榈醇棕榈酸月桂酸/SiO2复合材料具有良好的热湿综合性能,即相对湿度50%时,平均平衡含湿量为0.1020 g/g,相变温度为26.81~28.52℃,相变焓为95.69 J/g,属于微米级有机相变芯材/无机基体复合材料。
Hexadecanol-palmitic acid-lauric acid/SiO2 composite materials can be prepared by sol-gel method.The effect of absolute alcohol amount,deionized water amount and hexadecanol-palmitic acid-lauric acid amount on heat&moisture comprehensive property of hexadecanol-palmitic acid-lauric acid/SiO2 composites,and the preparation technology parameters for hexadecanol-palmitic acid-lauric acid/SiO2 composite materials was optimized.The results show that primary and secondary sequence of factors is the effect of absolute alcohol amount is obviously more sig-nificant than that of hexadecanol-palmitic acid-lauric acid amount,and the effect of hexadecanol-palmitic acid-lauric acid amount more significant than that of deionized water amount.Within the ranges of parameters in this study, absolute alcohol amount (mole ratio to tetraethyl orthosilicate)is 9.1 1 ,deionized water amount is 5.2 1 and hexade-canol-palmitic acid-lauric acid amount is 0.52.Hexadecanol-palmitic acid-lauric acid/SiO2 composite materials have the best heat-moisture comprehensive performance in the range of human comfort,i.e.average equilibrium moisture content is 0.102 0 g/g in relative humidity 50%,phase change temperature is 26.81 28.52 ℃,phase change enthalpy is 9 5.6 9 J/g,and belong to micron organic phase change core materials/inorganic substrate composite materials.
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