Patent Application

App. No. 14/875,914

Abstract

Claims (32)

1 . A coating composition, comprising:

at least one epoxy-functional polymer;

at least one metal-containing compound present in an amount sufficient to react with H 2 S to produce a metal sulfide having low solubility; and

at least one curing agent,

wherein the composition reduces H 2 S permeation when applied to a steel pipe or vessel.

2 . The coating composition of claim 1 , comprising

about 30 to 85 wt % of an epoxy functional polymer having a Tg of above 45° C.;

about 10 to 50 wt % of a metal-containing compound capable of reacting with H 2 S to produce a metal sulfide having low solubility; and

about 0.5 to 35 wt % of a curing agent capable of reacting with the epoxy-functional polymer, wherein the composition forms a coating resistant to H 2 S permeation when applied to a steel pipe or vessel.

3 . A method of protecting a steel substrate from H 2 S permeation, the method comprising:

providing a steel substrate;

applying on the steel substrate the coating composition of claim 1 and

curing the composition to form a coating resistant to H 2 S permeation.

4 . The composition of claim 1 , wherein the epoxy-functional polymer is glycidylated.

5 . The composition of claim 1 , wherein the epoxy-functional polymer is selected from glycidylated novolac resins, glycidylated cresol novolac resins, glycidylated polyamines, or mixtures or combinations thereof.

6 . The composition of claim 1 , wherein the metal-containing compound is selected from metal oxide, metal carbonate, metal sulfate, metal phosphate, metal carboxylate, or mixtures or combinations thereof.

7 . The composition of claim 1 , wherein the metal-containing compound comprises one or more oxides or salts of Fe(II).

8 . The composition of claim 1 , wherein the metal-containing compound comprises one or more oxides or salts of Fe(III).

9 . The composition of claim 1 , wherein the metal-containing compound comprises one or more oxides or salts of Zn(II).

10 . The composition of claim 1 , wherein the metal-containing compound is selected from FeO, Fe 2 O 3 , Fe 2 O 3 .nH 2 O, FeCO 3 , Fe 2 (CO 3 ) 2 , FeSO4, Fe 2 (SO 4 ) 3 , Fe 3 (PO 4 ) 2 , FePO 4 , Fe(OCOR) 2 , Fe(OCOR) 3 , wherein R is C1-C20 alkyl or C6-C20 aryl, or mixtures or combinations thereof.

11 . The composition of claim 1 , wherein the metal-containing compound is selected from ZnO, ZnCO 3 , ZnSO 4 , Zn 3 (PO4) 2 , Zn(OCOR) 2 , wherein R is C1-C20 alkyl or C6-C20 aryl, or mixtures or combinations thereof.

12 . The composition of claim 1 , wherein the metal-containing compound is Fe 2 O 3 .

13 . The composition of claim 1 , wherein the metal-containing compound is selected from Fe 2 O 3 , Fe 2 O 3 .nH 2 O, ZnO or combinations thereof.

14 . The composition of claim 1 , wherein the metal-containing compound is present in an amount of at least 5 wt %, based on the total weight of the composition.

15 . The composition of claim 1 , wherein the curing agent is selected from amine-functional compounds, phenol-functional compounds, cresol novolac-based compounds, bisphenol A-based compounds, catalytic curing agents, or combinations thereof.

16 . The composition of claim 1 , wherein the curing agent is a catalytic curing agent selected from alkyl-substituted imidazole, aryl-substituted imidazole, aminopyridine compounds, adducts of imidazole and BPA-derived compounds, or combinations thereof.

17 . The composition of claim 1 , wherein the curing agent comprises an adduct of 2-methylimidazole and a diglycidyl ether of bisphenol A.

18 . The composition of claim 1 , further comprising one or more additional epoxy resins.

19 . The composition of claim 1 , further comprising fillers, flow aids, pigments, degassing agents, dry-flow additives, or combination thereof.

20 . A coated article, comprising:

a steel substrate; and

a coating resistant to H 2 S permeation formed from the composition of claim 1 .

Assignments (8)