| 摘要 |
PURPOSE:To obtain the composition of high performance in coatability on metals, plastics, woods, cements, etc., and resistance to water, weather, corrosion and heat, with high surface hardness of the resulting film, by blending ethyl silicate, zirconium compound and isopropyl alcohol in specified proportion. CONSTITUTION:The objective composition can be obtained by blending (A) 100pts.wt. of an ethyl silicate, i.e., one of silicic acid compounds, of formula Si(C2H5O)4, (B) 20-100pts.wt. of a zirconium compound of formula Zr(C4H9O)4 and (C) 60-700pts.wt. of isopropyl alcohol. When coated on a base, this composition is instantaneously hydrolyzed at ambient temperatures 60 deg.C; at the same time, a polycondensation being induced, resulting in sol formation; the reaction advances further, converting to a gel. On heating the gel at 100-300 deg.C for 10-60min, is formed a clear glass film with a small amount of OH group constituted by silicic acid zirconia SiO2ZrO2. On further heating this film to 550-650 deg.C, a SiO2ZrO2 film will result.
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