Preparation of room temperature solid modified cycloaliphatic fluorine containing epoxide resins, useful as binders in preparation of coatings, at room temperature or at greater than 60 degreesC in presence of catalyst

摘要

Preparation of modified fluorine containing epoxy resins, containing (A) polyepoxy compounds, (B) polycarboxylic anhydride and (C) urea or a urea derivative, benzoguanamine and/or melamine, at room temperature or greater than 60 deg C in the presence of a catalyst is new. Preparation of storage stable, meltable and/or soluble and/or dispersible at room temperature modified epoxy resins with more than one epoxy group per mean molecular weight, optionally of fluorine content 0.01-2 wt.%, comprises reaction at room temperature of liquid cycloaliphatic polyepoxy compounds and cyclic monocarboxylic acids and/or cyclic hydroxymonocarboxylic acids, and/or dicarboxylic acids or their anhydrides and monohydric alcohols, glycolmonoalkyl ethers, polyglycolmonoalkyl ethers or fatty alcohols, where the half-ester has at least one cyclic ring structure. The reaction is carried out optionally with the use of unspecified amounts, relative to the fluorine-free carboxyl group containing compounds, of fluorine containing carboxylic acids or their anhydrides and/or perfluorocarboxylic acids of formula (I), at more than 60 deg C. The reaction is also optionally in the presence of organic solvents and/or catalysts for the epoxy-/carboxy reaction, using 0.1-0.49 mole carboxyl group containing compounds per epoxide group, and the amount of optional carboxyl group containing fluorine compounds is less than 0.1 mole per epoxide group, in accordance with patent application 199 01 118.4. The above carboxyl group containing compounds (modifying agents) can be completely or partially replaced by a polycarboxylic anhydride (component (B)), and urea and/or a urea derivative with at least one NH2 group and/or at least 2 NH- groups, of molecular weight below 200 and/or benzoguanamine and/or dimethylhydantoin and/or melamine (component (C)), where the ratio of polyepoxy compounds (component A) and component (C), according to the W.A. Reise equation, is so selected that 1-25 wt.% of the amount of (B) required for complete crosslinking of (A) is used, and 1-4 H-active equivalents of (C) are used per anhydride group of (B). F-(CF2)n-COOH (I) n = 5-21.