A refinish coating system comprising (I) an intermediate coating composition and (II) a topcoat coating composition is useful for repairing a damage area of a silicone hard coat layer on an automotive resin glazing substrate. The intermediate coating composition (I) comprises (A) a reactive siloxane compound and (B) silica. The topcoat coating composition (II) comprises (C) an alkoxysilane having a UV-absorbing functional group, (D) a multifunctional alkoxysilane, (E) a reactive siloxane compound, (F) colloidal silica, and (G) phosphoric acid. The system forms a coating having the same appearance and physical properties as the underlying silicone hard coat layer.
由 (I) 中间涂层组合物和 (II) 面涂层组合物组成的修补涂层体系可用于修补汽车
树脂上釉基材上
硅树脂硬涂层的损坏区域。中间涂层组合物(I)包括(A)活性
硅氧烷化合物和(B)
二氧化硅。面层涂料组合物(II)包括(C)具有紫外线吸收官能团的烷氧基
硅烷、(D)多功能烷氧基
硅烷、(E)活性
硅氧烷化合物、(F)胶体
二氧化硅和(G)
磷酸。该体系形成的涂层具有与底层有机
硅硬涂层相同的外观和物理性质。