Coating systems and formulations for cementitious articles

Patent metadata

Field	Value
Publication number	US-11279660-B1
Application number	US-202016791924-A
Country	US
Kind code	B1
Filing date	Feb 14, 2020
Priority date	Oct 31, 2016
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

Coating compositions suitable for machined cementitious substrates are provided. The coating compositions provide adhesion to the machined cementitious substrate while maintaining high mechanical film strength. The coating compositions are also compatible with industrial implementation, and exhibit good pot life.

First claim

What is claimed is:

1. A fiber cement article having a surface in contact with a coating, wherein the coating comprises:
an epoxy resin comprising a monomer including a cycloalkyl group, wherein the epoxy resin further comprises epoxide functional groups;
a first curing agent and a second curing agent, wherein each of the first curing agent and the second curing agent comprise amine hydrogen functional groups;
wherein the first curing agent comprises an oxyalkylene; and
wherein the second curing agent comprises a polyamine; and
wherein the second curing agent has a higher viscosity than the first curing agent; and
wherein the first curing agent has amine hydrogen functional groups in about 0.25 to about 2 equivalents, and the second curing agent has amine hydrogen functional groups in about 0.05 to about 0.5 equivalents, relative to one equivalent of epoxide functional groups in the epoxy resin.

2. The fiber cement building article of claim 1 , wherein the monomer of the epoxy resin includes a quaternary carbon center.

3. The fiber cement building article of claim 1 , wherein the monomer is

4. The fiber cement building article of claim 1 , wherein the first curing agent comprises primary amines.

5. The fiber cement building article of claim 1 , wherein the first curing agent comprises compounds having the formula

6. The fiber cement building article of claim 1 , wherein the second curing agent comprises a polyamine of ammoniated oxirane.

7. The fiber cement building article of claim 1 , wherein the first curing agent has amine hydrogen functional groups in about 1 to about 1.5 equivalents relative to one equivalent of epoxide functional groups in the epoxy resin.

8. The fiber cement building article of claim 1 , wherein the second curing agent has amine hydrogen functional groups in about 0.1 to about 0.3 equivalents, relative to one equivalent of epoxide functional groups in the epoxy resin.

9. The fiber cement building article of claim 1 , having a wet adhesion picking on a machined surface of less than about 30% following submersion for 24 hours.

10. The fiber cement building article of claim 1 , having a coating thickness of 0.2 to 2 mil.

Assignees

• Hardie James Technology Ltd

Inventors

• Peng Weiling
• Luo Caidian

Classifications

• C04B41/4853 Primary

  Epoxides · CPC title

• C08G59/504

  containing an atom other than nitrogen belonging to the amine group, carbon and hydrogen · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C04B41/009

  characterised by the material treated · CPC title

• C08G59/24

  carbocyclic · CPC title