耐电晕纳米有机硅氧化物杂化聚酰胺酰亚胺复合薄膜的制备及其介电性能  

Preparation and Dielectric Properties of Corona-resistant Nano organosilicone Oxide Hybrid Polyamide-imide Composite Film

作　　者：刘莉 王克强 陈昊[1] 赵伟[1] 范勇[1] LIU Li;WANG Keqiang;CHEN Hao;ZHAO Wei;FAN Yong(School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《绝缘材料》2021年第9期30-35,共6页Insulating Materials

基　　金：哈尔滨理工大学“理工英才”计划科学研究项目(LGYC2018JC033)。

摘　　要：采用甲基三乙氧基硅烷、正硅酸乙酯进行水解、聚合,得到纳米有机硅氧化物溶胶,将其折算成SiO2当量,通过高速剪切与聚酰胺酰亚胺(PAI)树脂混合,经铺膜和热固化后制备得到有机硅氧化物杂化PAI复合薄膜。采用红外光谱、X射线衍射和SEM对复合薄膜进行表征,并对复合薄膜的介电谱、电气强度和高温(155℃)耐电晕寿命进行测试。结果表明:纳米有机硅氧化物在树脂基体中以无定形态均匀分散;随着纳米有机硅氧化物含量的增加,杂化PAI复合薄膜的介电常数、介质损耗因数都逐渐增大,电气强度逐渐降低,耐电晕寿命先升高后降低,当纳米有机硅氧化物质量分数为15%的SiO2当量时,其高温耐电晕寿命是纯PAI薄膜的4.1倍。A nano organic silicone oxide sol was prepared by the hydrolysis and polymerization of methyl triethoxysilane and tetraethyl orthosilicate,which was converted into SiO2 equivalent to mixed with polyamide imide(PAI)resin through high-speed shearing,and then organic silicone oxide hybrid PAI composite films were prepared through film spreading and thermal curing.The composite films were characterized by infrared spectroscopy,X-ray diffraction,and SEM,and their dielectric spectra,electric strength,and corona resistance lifetime at high temperature(155℃)were tested.The results show that the nano organic silicone oxides disperse uniformly in an amorphous state in the resin matrix.With the increase of the nano organic silicone oxide content,the dielectric constant and dielectric loss factor of the hybrid PAI composite films increase gradually,the electric strength decreases gradually,and the corona resistance life increases at first and then decreases.When the mass fraction of the nano organic silicon oxide is 15%of SiO2 equivalent,the corona resistance life of the hybrid PAI composite film at high temperature is 3.1 times longer than that of pure PAI film.

关 键 词：聚酰胺-酰亚胺 纳米有机硅氧化物 介电性能 耐电晕 

分 类 号：TM215.1[一般工业技术—材料科学与工程]