Method of applying PTFE coating solution and vehicle part coated with PTFE coating solution

Patent metadata

Field	Value
Publication number	US-10301499-B2
Application number	US-201615179608-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Dec 10, 2015
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

A method of applying a PTFE (polytetrafluoroethylene) solution includes a dispersion step of dispersing a diamond powder in an organic solvent using bead milling to manufacture a dispersion solution, a mixing step of mixing a silane solution with the dispersion solution to manufacture a mixture solution, an addition step of adding the PTFE solution including PTFE particles having a size of 0.1 to 6 μm to the mixture solution to manufacture a coating solution, a coating step of applying the manufactured coating solution on a surface of a piston skirt to form a coated layer including a plurality of dimples distributed thereon, and a curing step of drying and heat-treating the coated layer.

First claim

What is claimed is:

1. A method of applying a PTFE (polytetrafluoroethylene) solution, comprising:
a dispersion step of dispersing a diamond powder in an organic solvent using bead milling to manufacture a dispersion solution;
a mixing step of mixing a silane solution with the dispersion solution to manufacture a mixture solution;
an addition step of adding the PTFE solution including PTFE particles having a size of 0.1 to 6 μm to the mixture solution to manufacture a coating solution;
a coating step of applying the manufactured coating solution on a surface of a piston skirt to form a coated layer including a plurality of dimples distributed thereon; and
a curing step of drying and heat-treating the coated layer,
wherein the plurality of dimples each has a diameter of 50 to 350 μm, and
wherein a density of the plurality of dimples is 0.5 dimples/mm 2 to 10 dimples/mm 2 .

2. The method of claim 1 , wherein a particle size of the diamond powder dispersed in the organic solvent during the dispersion step is 100 to 400 nm.

3. The method of claim 1 , wherein 100 parts by weight of the organic solvent and 5 to 10 parts by weight of the diamond powder are mixed to manufacture the dispersion solution during the dispersion step.

4. The method of claim 1 , wherein the silane solution has an amino functional group.

5. The method of claim 1 , wherein 100 parts by weight of the diamond powder and 2 to 6 parts by weight of the silane solution are mixed to manufacture the mixture solution during the mixing step.

6. The method of claim 1 , wherein the coating solution manufactured during the addition step has a viscosity of 20000 to 26000 cps.

7. The method of claim 1 , wherein the heat-treating is performed at 200 to 220 C for 10 to 20 min during the curing step.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Yool Koo

Classifications

• C09D127/18 Primary

  Homopolymers or copolymers of tetrafluoroethene · CPC title

• C08K3/04

  Carbon · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08K2201/009

  Additives being defined by their hardness · CPC title

• F02F3/10 Primary

  having surface coverings (F02F3/02 takes precedence) · CPC title