EVA/Nano-SiO_2隔热复合材料的制备及性能研究  

Study on the Preparation and Properties of Heat-insulating EVA/Nano-SiO_2 Composites

作　　者：张祯华[1] 李光吉[1] 冯晖[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《塑料工业》2011年第12期98-103,共6页China Plastics Industry

基　　金：中国科学院可再生能源与天然气水合物重点实验室开放基金项目资助(No.0907K7)

摘　　要：通过挤出共混法将低导热系数的纳米二氧化硅(nano-SiO2)添加到乙烯-乙酸乙烯酯共聚物(EVA)中,制备了用于透明隔热型夹层玻璃中间膜的EVA/nano-SiO2隔热复合材料。系统地研究了nano-SiO2的含量和比表面积对EVA/nano-SiO2复合材料的隔热性能、拉伸性能、可见光透过率以及热稳定性的影响,并考察了复合材料与玻璃之间的黏合强度。结果表明,nano-SiO2作为隔热添加剂,其含量和比表面积的增加均会使EVA/nano-SiO2复合材料的导热系数下降,隔热性能得到改善。与未改性EVA相比,含9.0%nano-SiO2(比表面积为300 m2/g)的EVA/nano-SiO2复合材料的导热系数最低,为0.219 9 W/(m.K);用其胶膜夹在两块玻璃中间制作的盖板能使隔热箱内的温度降低4.1℃。nano-SiO2的质量分数在3.8%～9.0%范围内,EVA/nano-SiO2复合材料与玻璃的黏合强度均大于30 N/cm;nano-SiO2质量分数为5.6%左右,复合材料的黏合强度、拉伸强度和断裂伸长率均出现最大值,可见光透过率约为80%。Nano-SiO 2 with low thermal conductivity was added to EVA through extrusion blending to prepare the heat-insulating EVA/nano-SiO2 composites that can be used for the inter layers of transparent and heat-insulating laminated glass. The effects of the nano-SiO 2 content and specific surface area were systematically studied on the heat-insulating property, the tensile properties, the transmittance and the thermal stability of the EVA/Nano-SiO2 composites; and the adhesive strength to glass of the composites was also investigated. The experimental results indicated that an increase in the content and the specific surface area of nano- SiO2 used as a heat-insulating additive can make the thermal conductivity of the EVA/nano-SiO2 composites decrease, thus improving their heat-insulating property. Compared with the unmodified EVA, the EVA/ nano-SiO 2 composite containing 9.0 wt% nano-SiO 2 with the specific surface area of 300 m 2/g possessed the lowest thermal conductivity among the prepared composites, i.e. 0. 219 9 W/（m · K） ; and the cover plate made by sandwiching the composite film between two pieces of glass can make the temperature inside the heat- insulating box decrease by 4. 1 ℃. Within the range of nano-SiO 2 content （3.8 - 9.0 wt% ） investigated, the adhesive strength of the EVA/nano-SiO 2 composites to glass was all beyond 30 N/cm. While the nano- SiO 2 content as in the vicinity of 5.6 wt%, the adhesive strength to glass, gation at break of the composites can reach their maximum values, and the 80%. The tensile strength and the elontransmittance of them will be about

关 键 词：乙烯-乙酸乙烯酯共聚物胶膜 纳米二氧化硅 导热系数 隔热性能 

分 类 号：TB332[一般工业技术—材料科学与工程]