采用硅烷偶联剂（KH560）对纳米SiO2溶胶进行表面改性，然后将其与水性聚氨酯乳液（WPU）共混制备了WPU/SiO2复合乳液。通过纳米粒度仪测定了不同偶联剂含量改性SiO2溶胶的粒径及其分布；采用TEM、FT-IR、TGA等对复合乳液及其涂膜进行表征，探讨了改性纳米溶胶含量对复合乳液及其涂膜性能的影响。结果表明：当纳米SiO2溶胶与KH560摩尔比为6∶1时，该改性纳米SiO2溶胶的粒径最小且分布较为均一；KH560的加入使纳米SiO2粒子更均匀的分散在聚氨酯乳液中，且SiO2粒子与聚氨酯乳液之间存在一定键合作用，使涂层的耐热性得到显著增强；当改性SiO2溶胶添加量为5%～10%时，涂膜的硬度、耐磨性、耐划伤性、耐水性等性能明显提高。
Using γ-glycidoxypropyltrimethoxysilane(KH560) to modify nano SiO2 sol, a WPU/SiO2 hybrid emulsion was prepared by blending waterborne polyurethane(WPU) emulsion with the modified silica. The size and its distribution of the colloidal silica with different content of KH560 were tested by laser parti-cle analyzer. The hybrid emulsion and its coating were characterized by FT-IR, TEM and TGA, and the effects of modified colloidal silica content on the properties of the coating were investigated. The results indicate that when the molar ratio of SiO2 and KH560 is 6∶1, the size of the colloidal silica is the small-est and its distribution is more uniform. The colloidal silica modified by KH560 can well disperse in the polyurethane emulsion. It exists certain bonding action between SiO2 particles and polyurethane emulsion, making the heat-resistance of the coating improve significantly. When the modified SiO2 sol dosage is 5%~10%, the hardness, wear resistance, scratch resistance and water resistance of the coating is improved ob-viously.
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