Coating composition

Patent metadata

Field	Value
Publication number	US-2023279258-A1
Application number	US-202318116710-A
Country	US
Kind code	A1
Filing date	Mar 2, 2023
Priority date	Mar 3, 2022
Publication date	Sep 7, 2023
Grant date	—

Abstract

A coating composition includes an epoxy resin including an epoxy monomer, a toughener and one or more self-lubricating fillers. The coating composition can be employed in a bearing that has an outer member that has a radially inwardly facing surface that defines an interior area. An inner member is disposed in the interior area. The inner member has a radially outward facing bearing surface. The coating composition is disposed between the radially inwardly facing surface and the radially outward facing bearing surface.

First claim

What is claimed is:

1 . A coating composition comprising:
an epoxy resin comprising an epoxy monomer; a toughener; and at least one self-lubricating filler.

2 . The coating composition of claim 1 , wherein the epoxy monomer comprises diglycidyl ether of bisphenol F.

3 . The coating composition of claim 1 , further comprising an epoxy curative.

4 . The coating composition of claim 3 , wherein the epoxy curative is a latent curing agent.

5 . The coating composition of claim 4 , wherein the latent curing agent comprises a diamine epoxy curative.

6 . The coating composition of claim 5 , wherein the diamine epoxy curative comprises 4,4′-Diaminodiphenyl sulphone (44DDS).

7 . The coating composition of claim 1 , wherein the epoxy resin comprises at least one oxirane group.

8 . The coating composition of claim 7 , wherein the oxirane group is ethylene oxide.

9 . The coating composition of claim 1 , wherein the toughener comprises a thermoplastic polyhydroxyether.

10 . The coating composition of claim 9 , wherein the thermoplastic polyhydroxyether comprises at least one sidechain hydroxyl group.

11 . The coating composition of claim 10 , wherein the sidechain hydroxyl group forms ether bonds with at least one oxirane group of the epoxy resin;
the thermoplastic polyhydroxyether has a first glass transition temperature; wherein when the thermoplastic polyhydroxyether is added to the epoxy resin and cured, the coating composition has a second glass transition temperature than is greater that the first glass transition temperature.

12 . The coating composition of claim 1 , further comprising a reinforcing fillers selected from the group consisting of glass fibers, glass particles, aramid fibers, carbon fiber, carbon particles, ceramic fiber, ceramic particles, polyester fibers, polyhydroxyether fibers, and nylon fibers.

13 . The coating composition of claim 1 , wherein the at least one self-lubricating filler comprises polytetrafluoroethylene.

14 . The coating composition of claim 13 , wherein the polytetrafluoroethylene is in at least one of a fiber form and a powder form.

15 . The coating composition of claim 14 , wherein the polytetrafluoroethylene is in a fiber form treated with a sodium napthalene etch.

16 . The coating composition of claim 1 , wherein the at least one self-lubricating filler comprises at least one of graphite, graphite fluoride, hexagonal boron nitride, zinc oxide, molybdenum disulfide, and tungsten disulfide.

17 . The coating composition of claim 1 , wherein the coating composition is at least one of moldable and machinable.

18 . A bearing comprising:
an outer member having a radially inwardly facing surface that defines an interior area; an inner member disposed at least partially in the interior area, the inner member having a radially outward facing bearing surface; and the coating composition of claim 1 being one of:
(i) adhered to the radially inwardly facing surface and in sliding engagement with the radially outward facing bearing surface; and
(ii) adhered to the radially outward facing bearing surface and in sliding engagement with the radially inwardly facing surface.

Assignees

• Roller Bearing Co America Inc

Inventors

• Richard Nolan

Classifications

• C09D163/00 Primary

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• C09D171/08

  Polyethers derived from hydroxy compounds or from their metallic derivatives (C09D171/02 takes precedence) · CPC title

• C09D127/18

  Homopolymers or copolymers of tetrafluoroethene · CPC title

• C09D163/04

  Epoxynovolacs · CPC title

• C08G59/1438

  containing oxygen · CPC title