Corrosion resistant hybrid silanized epoxy ester resins, coatings and surface pre-treatment formulations

Patent metadata

Field	Value
Publication number	US-2016376447-A1
Application number	US-201514734089-A
Country	US
Kind code	A1
Filing date	Jun 9, 2015
Priority date	Jul 23, 2014
Publication date	Dec 29, 2016
Grant date	—

Abstract

A self-healing coating composition for use on metals includes a polyurea, an epoxy ester unsaturated resin, a combination of amine terminated siloxane and epoxy terminated siloxane and an organoclay. The polyurea is a water-soluble, aromatic polyurea and likewise, the epoxy ester is a water-soluble, aromatic epoxy ester. The coating composition is formed in a non-volatile solvent, such as N-Methylpyrrolidone. It can be applied to a metal surface and cured at room temperature to form a coating that is resistant to corrosion. Further the coating self-heals in a manner similar to a chromate coating.

First claim

What is claimed is:

1 . A coating formed from:
a water-soluble epoxy ester unsaturated resin; a water-soluble polyurea; an amine terminated siloxane and an epoxy terminated siloxane; and a clay.

2 . The coating composition claimed in claim 1 wherein said epoxy ester unsaturated resin is a water-soluble, aromatic epoxy ester.

3 . The coating composition claimed in claim 2 wherein said epoxy ester unsaturated resin is formed from an aromatic epoxy and an unsaturated fatty acid.

4 . The coating composition claimed in claim 3 wherein said fatty acid is a C15 to C18 fatty acid.

5 . The coating composition claimed in claim 3 wherein said formulation includes from about 20% to about 50% by weight epoxy ester.

6 . The coating composition claimed in claim 5 wherein said coating composition includes from 30-45% by weight epoxy ester.

7 . The coating composition claimed in claim 1 wherein said polyurea is a water-soluble, aromatic polyurea.

8 . The coating composition claimed in claim 7 wherein said polyurea has a molecular weight of 5,000 to about 20,000 weight avg MW.

9 . The coating composition claimed in claim 7 wherein said polyurea has an intrinsic viscosity of .05 to about .21

10 . The coating composition claimed in claim 1 wherein said coating composition has a ratio by weight of polyester to polyurethane of 30 to 70, to 70 to 30.

11 . The coating composition claimed in claim 1 wherein said clay is montmorillonite clay.

12 . The coating composition claimed in claim 11 wherein said clay is treated with a quaternary ammonium compound.

13 . The coating composition claimed in claim 12 wherein said clay is 15A cloisite.

14 . The coating composition claimed in claim 11 wherein the coating compound comprises .1% to 5% clay.

15 . The coating composition claimed in claim 14 comprising .5 to 2.5% clay by weight.

16 . The coating composition claimed in claim 1 further comprising a non-volatile organic solvent.

17 . The coating composition claimed in claim 16 wherein said non-volatile organic solvent comprises N-Methylpyrrolidone.

18 . The coating composition claimed in claim 1 applied to a metal surface selected from the group consisting of aluminum, aluminum alloys, iron and steel.

19 . The coating composition claimed in claim 1 wherein said amine silane is amine terminated trimethoxysilane.

20 . A method of forming a corrosion resistant coating comprising:
combining clay with a polyurea dispersed in a non-volatile organic solvent; combining an epoxy silane to said polyurea and subsequently adding an amine silane to said polyurea; and subsequently adding an epoxy ester unsaturated resin to said polyurea, wherein said coating composition can be applied to a metal surface and cured by heating said coating to a temperature of at least about 100° C.

Assignees

• Univ Cincinnati

Inventors

• Lroh Jude
• Beemat Jaspreet S

Classifications

• C09D175/04

  Polyurethanes · CPC title

• C23F11/10

  using organic inhibitors · CPC title

• C09D5/08 Primary

  Anti-corrosive paints · CPC title

• C09D167/025

  containing polyether sequences · CPC title

• C09D163/10

  Epoxy resins modified by unsaturated compounds · CPC title