Curing agent composition and curing agent coating formula thereof

1. A curing agent composition, comprising:

5 to 25 wt % of an ester group-containing amine end group adduct;

2 to 25 wt % of a C8-C22 hydrophobic saturated or unsaturated fatty amine;

2 to 25 wt % of a polyamine compound;

2 to 20 wt % of a silane compound; and

10 to 60 wt % of an ether solvent;

wherein the ester group-containing amine end group adduct has a chemical formula of:

wherein m=1-100, n=1-15, X and Y are each independently selected from H, methyl, ethyl, and hydroxymethyl; R 1 is a C2-C18 aliphatic, cycloaliphatic, or aromatic group unsubstituted or substituted with non-reactive oxygen, or up to an average of 4 secondary or tertiary nitrogen atoms; R 2 and R 3 are each independently selected from H, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, or R 2 and R 3 are bonded to each other to form a substituted or unsubstituted ring; R 0 is a C6-C30 hydrocarbon group having at least one aromatic ring, and substituted or unsubstituted with oxygen atom, nitrogen atom, sulfur atom, or a C6-C17 aliphatic hydrocarbon group;

wherein the ester group-containing amine end group adduct is obtained by the following steps in a recited order:

(a) an esterification step, wherein the esterification step is mixing a polyol and a polyanhydride at a ratio of 1.1:1 and reacting the polyol and the polyanhydride at a temperature between 110 and 130° C., thereby producing an ester-based emulsifier;

(b) a chain extension step, wherein the chain extension step is reacting the ester-based emulsifier with a bifunctional epoxy resin in an equivalent ratio of 0.05:1 under a reaction conditions of the chain extension step are firstly reacting at a temperature of 110 to 130° C. for 1 hour, then reacting at a temperature of 130 to 150° C. for 2 hours, thereby producing a polymer intermediate; and

(c) reacting the polymer intermediate and a polyamine compound with an equivalent ratio of 0.2:1 at a temperature of 70° C. for 4 hours, thereby producing the ester group-containing amine end group adduct.

2. The curing agent composition according to claim 1 , wherein the C8-C22 hydrophobic saturated or unsaturated fatty amine is 9-octadecenylamine.

3. The curing agent composition according to claim 1 , wherein the polyamine compound is a polyetheramine compound or a polyethoxytallowamine compound.

4. The curing agent composition according to claim 1 , wherein the silane compound is an amine silane compound or an epoxy silane compound.

5. The curing agent composition according to claim 1 , wherein the ether solvent is selected from a group consisting of propylene glycol methyl ether, dipropylene glycol dimethyl ether, and dipropylene glycol methyl ether.

6. The curing agent composition according to claim 1 , wherein the ester group-containing amine end group adduct is further end-capped, wherein the end-capped ester group-containing amine end group adduct is obtained by an end-capping reaction between the ester group-containing amine end group adduct and a monofunctional epoxy compound, thereby producing an end-capped hardening agent, wherein the end-capped hardening agent has a chemical formula of:

7. The curing agent composition according to claim 6 , wherein the monofunctional epoxy compound is selected from a group consisting of 1,2-hexene oxide, 1,2-heptene oxide, iso-heptene oxide, 1,2-octene oxide, 1, 2-dodecene monoxide, 1,2-pentadecenylene oxide, butadiene monoxide, isoprene monoxide, styrenated oxide, methyl glycidyl ether, ethyl glycidyl ether, phenyl glycidyl ether, n-butyl glycidyl ether, tolyl glycidyl ether, isopropyl glycidyl ether, benzyl glycidyl ether, glycidyloxypropyl trimethoxysilyl, octyl glycidyl ether, nonyl glycidyl ether, decyl glycidyl ether, dodecyl glycidyl ether, tetradecyl glycidyl ether, p-tert-butylphenyl glycidyl ether, and o-tolyl glycidyl ether.

8. A curing agent coating formula, including:

10 to 30 wt % of aqueous epoxy resin;

1 to 10 wt % of the curing agent composition according to claim 1 ;

0.1 to 5 wt % of dispersant;

1 to 5 wt % of rheological agent;

1 to 10 wt % of film forming agent;

5 to 30 wt % of solvent; and

10 to 70 wt % of metal powder.

9. The curing agent coating formula according to claim 8 , wherein the metal powder is selected from a group consisting of zinc powder, aluminum powder, and magnesium powder.

10. The curing agent coating formula according to claim 8 , wherein the film-forming agent is selected from a group consisting of propylene glycol monomethyl ether or dipropylene glycol butyl ether.