Clear coating method, coating method, and coating film structure

Patent metadata

Field	Value
Publication number	US-9815084-B2
Application number	US-201414890571-A
Country	US
Kind code	B2
Filing date	Apr 23, 2014
Priority date	May 13, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A clear coating method comprising: applying a clear paint on a topcoat base coating film ( 21 ) under a first coating condition, and thereby forming a first wet clear coating film in a first stage ( 14 A); successively applying a clear paint on the first wet clear coating film under a second coating condition different from the first coating condition without baking the first wet clear coating film, and thereby forming a second wet clear coating film in a second stage ( 14 B); and baking the first wet clear coating film and the second wet clear coating film and thereby forming a clear coating film, wherein a painted non-volatility value of the clear paint in the second stage is larger than a painted non-volatility value of the clear paint in the first stage, an average atomized paint particle size of the clear paint in the second stage is smaller than an average atomized paint particle size of the clear paint in the first stage, and a thickness of the second wet clear coating film is thinner than a thickness of the first wet clear coating film.

First claim

The invention claimed is:

1. A clear coating method comprising:
spraying a first clear paint on a topcoat base coating film under a coating condition in which the first clear paint has a NV 2m of 60% to 70%, the NV 2m being a painted non-volatility value after two minutes from applying, and an average atomized paint particle size of the first clear paint is 60 μm to 100 μm, thereby forming a first wet clear coating film having a thickness of 80% to 91% with respect to a total clear coating film thickness in a first stage; and
successively spraying a second clear paint on the first wet clear coating film under a coating condition in which the second clear paint has a NV 2m of 80% to 90% and an average atomized paint particle size of the second clear paint is 30 μm or less without baking the first wet clear coating film, thereby forming a second wet clear coating film having a thickness of 9% to 20% with respect to the total clear coating film thickness in a second stage.

2. The method as set forth in claim 1 , wherein a wet clear coating film, including the first wet clear coating film and the second wet clear coating film after the second stage, has a NV 2m of 60% to 75%.

Assignees

• Nissan Motor

Inventors

• Hwang Inhye

Classifications

• B05D7/53

  Base coat plus clear coat type · CPC title

• B05D7/532 Primary

  the two layers being cured or baked together, i.e. wet on wet · CPC title

• B05D7/572

  all layers being cured or baked together · CPC title

• B05D7/577

  some layers being coated "wet-on-wet", the others not · CPC title

• B05D1/36 Primary

  Successively applying liquids or other fluent materials, e.g. without intermediate treatment · CPC title