【摘要】 考察了纳米SiO2基复合隔热材料各组分添加量对吸水率的影响,同时针对复合材料吸水率高的问题,通过热处理和添加疏水纳米SiO2的方式来降低吸水率。结果表明:纳米Al2O3和无碱超细玻璃纤维对复合材料吸水率影响不大,添加锆英石会使材料吸水率升高。高温热处理会在一定程度上降低吸水率,但温度应控制在800℃以下。添加疏水纳米SiO2可显著降低材料吸水率,缩短吸水平衡时间,且添加量愈高,复合材料疏水效果愈明显。更多还原

【Abstract】 High water absorption for thermal insulations will decrease thermal insulating and mechanical properties.In this paper,the effects of components on water absorption were investigated.Moreover,regarding to the problem of high water absorption,thermal treatment and hydrophobic nano-silica were adopted to solve the problem.The results indicates that nano-alumina and E-glass has little effect on water absorption of the composites,and water absorption will increase with the addition of zirconite.Heat treatment can decrease the water absorption to some extent,but should be tightly controlled below 800℃.The introduction of hydrophobic nano-silica can significantly decrease water absorption and shorten absorption balance time.Furthermore,better results can be achieved with the increase of additive amount of hydrophobic nano-silica.更多还原