US 4,246,148 AGranted

Two component aqueous coating composition based on an epoxy-polyamine adduct and a polyepoxide

AssigneeCelanese Corporation

InventorsDavid A. Shimp, Darrell D. Hicks, Richard B. Graver

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Abstract

The present invention is directed to a two component industrial maintenance coating. The first component is a polyamine terminated epoxy resin which is end capped with a monoepoxide. The second component is a low molecular weight polyepoxide crosslinker. When salted with an acid, the adduct can be dissolved or dispersed in water. The polyepoxide crosslinker can then be microemulsified in the system. When coated on a substrate, the two component mixture cures at room temperature producing coatings having excellent balance of chemical and physical properties.

Claims13

Dependent claims

A two component resin coating system wherein when the components are mixed forms a curable coating composition which comprises:

(I) a first component comprising
(A) an end capped polyamine terminated polyepoxide resin adduct which is the reaction product of
(1) a polyepoxide resin represented by the structural formula:
##STR4## wherein R is a divalent hydrocarbon radical of a dihydric phenol and the average value of n is not greater than 5;
and
(2) a polyamine having at least two amine nitrogen atoms per molecule, at least three reactive amine hydrogen atoms per molecule and no other groups reactive with epoxide groups to form a polyamine terminated epoxy adduct;
and
(3) an end capping agent which is a monoepoxide having between about 9 and about 16 carbon atoms, one 1,2-epoxide group per molecule and no other groups reactive with amine groups;
and wherein
(a) at least 25 mole percent of the monoepoxide constituting the end capping agent is an aliphatic monoepoxide;
(b) at least a portion of the end capping agent additionally is a crosslinker-compatibilizing-amount of an aromatic monoepoxide when the average value of n of the polyepoxide resin of I-A-I is not greater than about 2;
(c) about 1 mole of the polyamine of I-A-2 is reacted per epoxide equivalent of the polyepoxide resin of I-A-1;
and
(d) said end capping agent is reacted with said polyamine terminated polyepoxide resin adduct in an amount sufficient to eliminate the presence of primary amines on said adduct and to achieve at least a molar ratio of 2:1 respectively of end capping agent to adduct and not greater than the amount which would theoretically eventually lead to a reduction in the amine hydrogen functionality per mole of said end capped polyamine terminated epoxy adduct to below about 3 by reaction with monoepoxide;
and
(II) a second component comprising
(A) a polyepoxide resin crosslinker which is a glycidyl polyether of a polyhydric phenol having an epoxide equivalent weight of not greater than about 600, the amount of said crosslinker in the second component being sufficient to achieve an epoxy to reactive end capped adduct amine hydrogen equivalent weight ratio of from about 0.5:1 to about 1.5:1;
and wherein said first and second components are suitable for mixing when the amine groups of the end capped polyamine terminated epoxy adduct are salted to a degree of from about 15 to about 85% by reaction with a volatile acid and the first component is diluted with water in an amount sufficient to achieve a solids content in the first component of from about 15 to about 45%, by weight, based on the weight of the end capped polyamine terminated epoxy adduct and water.

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Dependencies are inferred from the claim text.

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Abstract

A two component resin coating system wherein when the components are mixed forms a curable coating composition which comprises:

(I) a first component comprising
(A) an end capped polyamine terminated polyepoxide resin adduct which is the reaction product of
(1) a polyepoxide resin represented by the structural formula:
##STR4## wherein R is a divalent hydrocarbon radical of a dihydric phenol and the average value of n is not greater than 5;
and
(2) a polyamine having at least two amine nitrogen atoms per molecule, at least three reactive amine hydrogen atoms per molecule and no other groups reactive with epoxide groups to form a polyamine terminated epoxy adduct;
and
(3) an end capping agent which is a monoepoxide having between about 9 and about 16 carbon atoms, one 1,2-epoxide group per molecule and no other groups reactive with amine groups;
and wherein
(a) at least 25 mole percent of the monoepoxide constituting the end capping agent is an aliphatic monoepoxide;
(b) at least a portion of the end capping agent additionally is a crosslinker-compatibilizing-amount of an aromatic monoepoxide when the average value of n of the polyepoxide resin of I-A-I is not greater than about 2;
(c) about 1 mole of the polyamine of I-A-2 is reacted per epoxide equivalent of the polyepoxide resin of I-A-1;
and
(d) said end capping agent is reacted with said polyamine terminated polyepoxide resin adduct in an amount sufficient to eliminate the presence of primary amines on said adduct and to achieve at least a molar ratio of 2:1 respectively of end capping agent to adduct and not greater than the amount which would theoretically eventually lead to a reduction in the amine hydrogen functionality per mole of said end capped polyamine terminated epoxy adduct to below about 3 by reaction with monoepoxide;
and
(II) a second component comprising
(A) a polyepoxide resin crosslinker which is a glycidyl polyether of a polyhydric phenol having an epoxide equivalent weight of not greater than about 600, the amount of said crosslinker in the second component being sufficient to achieve an epoxy to reactive end capped adduct amine hydrogen equivalent weight ratio of from about 0.5:1 to about 1.5:1;
and wherein said first and second components are suitable for mixing when the amine groups of the end capped polyamine terminated epoxy adduct are salted to a degree of from about 15 to about 85% by reaction with a volatile acid and the first component is diluted with water in an amount sufficient to achieve a solids content in the first component of from about 15 to about 45%, by weight, based on the weight of the end capped polyamine terminated epoxy adduct and water.

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