氨基树脂对SiO2/有机硅杂化硬质涂料性能的影响

Effect of Amine Resin on the Property of SiO2/Silicone hybrid Hard Coatings

摘要:

以正硅酸乙酯(TEOS)和有机硅氧烷为主要原料，采用溶胶-凝胶(Sol-gel)技术合成透明的SiO2/有机硅溶液，引进氨基树脂在聚碳酸酯(PC)表面上制备硬质的硅/氨杂化薄膜。考察了氨基树脂用量对SiO2/有机硅涂料性能的影响，并采用红外光谱(IR)、紫外光谱(UV)、热重分析(TG)、粒径分析仪和扫描电镜(SEM)等方法对硅/氨杂化涂料进行表征。结果发现，硅/氨杂化树脂胶粒的粒径为162.5nm。添加少量的氨基树脂能够明显改善涂膜的耐碱性能，在碱液中浸泡24h后，薄膜的透光率为90.7％，对PC基材仍具有一定的增透作用。杂化固化膜呈均相致密结构。当氨基树脂的用量为2％时，薄膜对PC基材的附着力为1级，铅笔硬度为2H。氨基树脂的添加使得硬质薄膜的热稳定性有所降低。

Abstract:

The transparent SiO2/silicone resin was prepared with tetraethoxysilane(TEOS) and organosiloxane as the main materials by the sol-gel method, then the silicone/amine hybrid hard film was prepared on polycarbonate (PC) by adding amine resin. The effects of the proportion of amine resin on the properties of hybrid hard film were discussed. The structure, morphology and transmittance of the hybrid coating were characterized by FTIR, UV, TG, SEM and particle size analyzer etc. The results show that the distribution of the hybrid resin particle size is about 162.5 nm. The alkali resistance of the hybrid film can be significantly improved by adding a small amount of amine resin. After the hybrid film is dipped in the alkali solution for 24h, its light transmittance is still up to 90.7%, and can improve the transparency of PC. When mass percent of amine resin to silicone resin is 2%, the adhesion strength of hybrid film to PC sheet is 1 grade, and pencil hardness is 2H; After heat-treated at 120℃, the hybrid film is smooth, homogenous and densification; However, the thermal stability of the hybrid film is lower slightly than that of the SiO2/silicone hard film.