以正硅酸乙酯和有机硅氧烷为原料,采用溶胶-凝胶法合成透明的SiO2/有机硅树脂,然后与聚酯进行缩合反应,在聚碳酸酯（PC）表面上制备硬质的聚酯/SiO2/有机硅复合薄膜.探讨聚酯和SiO2/有机硅树脂配比对复合涂料性能的影响,并采用红外光谱、热重分析、原子力显微镜、扫描电镜、紫外光谱和X射线衍射等方法对复合材料进行表征.结果表明：SiO2/有机硅树脂上的乙氧基与聚酯上的羟基发生了缩合反应,形成SiOC结构.当SiO2/有机硅树脂的质量分数控制在75%～83%时,复合涂料具有良好的稳定性,贮存期超过10个月;热固化后复合膜表面平整,呈非晶结构,对PC有一定的增透作用,对PC的附着力为0级,铅笔硬度为2H;随着SiO2/有机硅树脂含量的增加,复合膜的热稳定性逐渐提高.

First,transparent SiO2/silicone resin was prepared by means of the sol-gel method,with tetraethoxysilane and organosiloxane as the raw materials.Then,polyester/SiO2/silicone hardcoat composite films were synthesized on polycarbonate（PC） via the condensation between SiO2/silicone resin and polyester.Finally,the effect of SiO2/silicone resin-to-polyester ratio on the properties of the composite coating was discussed,and the structure and properties of the composite coating were characterized by means of FT-IR,TGA,AFM,SEM,UV spectroscopy and XRD,etc.The results show that the composite with structure is obtained due to the co-condensation between the ethoxy groups in SiO2/silicone resin and the hydroxyl groups in polyester,that the composite coating which is an SiO2/silicone resin mass fraction ranging from 75% to 83% and a storage period of more than ten months,possesses good stability,and that the composite film after the thermal curing,which is smooth and amorphous,improves the transparency of PC sheet,with an adhesion strength to PC sheet of 0 grade and a pencil hardness of 2H.Moreover,it is indicated that the composite film is of excellent thermal stability gradually increasing with the SiO2/silicone resin dosage.