Abstract： With binary fatty acid as phase change material, SiO2 as carrier material, according to different core-shell ratio, made binary fatty acid/SiO2 composite materials by sol-gel method. Humidity performance of binary fatty acid/SiO2 composite materials were tested, composition structure, microstructure and particle size distribution were characterized. The results showed that under the action of surface tension and capillary, binary fatty acid wrapped in SiO2 network space structure. While binary fatty acid content was 0.06 mol, binary fatty acid/SiO2 composite materials had the best humidity performance, such as equilibrium moisture content was 0.1297~0.1775 g/g and equilibration time is 31~46 min in the relative humidity of 40%~60%. SiO2 has rich "cage" structure, not only package and bound binary fatty acids, but also adsorption in the environment of water molecules. Binary fatty acid/SiO2 composite materials d10 was 148.54 nm, d50 was 254.73 nm and d90 was 452.73 nm.
2017, Vol. 17 
