Coated sheave

Patent metadata

Field	Value
Publication number	US-9815667-B2
Application number	US-201214401378-A
Country	US
Kind code	B2
Filing date	May 16, 2012
Priority date	May 16, 2012
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A method for applying a coating to a substrate includes obtaining a fluorinated polymer compound, where the fluorine is chemically or covalently bonded to the polymer molecule; and coating the surface of the substrate with the fluorinated polymer compound.

First claim

The invention claimed is:

1. A method for making a coated sheave, comprising:
obtaining a sheave comprising a contact surface;
obtaining a fluorinated polymer compound selected from polyurethanes, epoxy polymers, polyesters, polyureas, polyamides, polyimides, or silicones, where fluorine is chemically or covalently bonded to the polymer; and
coating the sheave contact surface with the fluorinated polymer compound.

2. The method of claim 1 , further comprising subjecting the sheave contact surface to a post-treatment process after coating the surface.

3. The method of claim 2 , wherein the post-treatment process comprises drying the sheave in an environment including controlled temperature and relative humidity.

4. The method of claim 3 , wherein the temperature of the environment is in the range of about 10 degree Celsius to about 32 degree Celsius.

5. The method of claim 3 , wherein the relative humidity of the environment is less than 85 percent.

6. The method of claim 1 , further comprising subjecting the sheave contact surface to a surface pre-treatment process to provide a pre-treated surface prior to coating.

7. The method of claim 6 , wherein the pre-treatment process comprises roughening of the surface with an abrasive.

8. The method of claim 7 , wherein the roughening further comprises a commercial blast cleaning using SSPC-SP 6 or SSPC-SP 10 standards.

9. The method of claim 6 , wherein the pre-treatment process further comprises etching the surface with a phosphoric acid based solution.

10. The method of claim 6 , further comprising chemically cleaning the pre-treated surface with a solution of acid catalyzed vinyl wash primer.

11. The method of claim 10 , further comprising applying a primer to the pre-treated surface.

12. A sheave comprising:
a substrate including a surface; and
a fluorinated polymer compound selected from polyurethanes, epoxy polymers, polyesters, polyureas, polyamides, polyimides, or silicones, the fluorinated polymer compound including fluorine chemically or covalently bonded to the polymer;

wherein the surface is coated with the fluorinated polymer compound.

13. The sheave of claim 12 , wherein the surface has an average roughness value (Ra) in a range of between about 25 microns and about 50 microns before the fluorinated polymer compound is applied.

14. The sheave of claim 12 , wherein the surface has a surface tension contact angle δ of less than about 45 degrees.

15. The sheave of claim 12 , wherein the fluorinated polymer compound has a thickness in a range of between about 30 microns to about 100 microns.

16. The sheave of claim 12 , wherein the sheave is an idler sheave.

17. The sheave of claim 12 , wherein the sheave is a traction sheave.

18. The sheave of claim 12 , wherein the sheave is a deflector sheave.

19. The sheave of claim 12 , wherein the substrate is one of a metal alloy, a ceramic, a polymer, a polymer composite, or a metallic core coated with a ceramic or base polymer.

20. The sheave of claim 12 , wherein the fluorinated compound comprises a polyurethane.

Assignees

• Yu Xiaomei
• Chen Yan
• Polak David R
• Viens Daniel V
• Wesson John P
• Otis Elevator Co

Inventors

• Yu Xiaomei
• Chen Yan
• Polak David R
• Viens Daniel V
• Wesson John P

Classifications

• B05D5/083

  involving the use of fluoropolymers · CPC title

• B05D3/12

  by mechanical means · CPC title

• B66B15/02 Primary

  Rope or cable carriers · CPC title

• B05D3/10

  by other chemical means · CPC title

• B05D3/002

  Pretreatement · CPC title