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Coating method of automobile body

A coating method and a vehicle body technology, which are applied to the device for coating liquid on the surface, the coating, and the pretreatment surface, etc., which can solve the problems of not being able to obtain the appearance of the coating film, turbulent flow at the interface of the coating film, and cumbersome working procedures.

Inactive Publication Date: 2010-03-17
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, in such a case, in either the workplace 5 or the workplace 6, there will be a problem that the inner panel portion and the boundary portion of the automobile body must be painted twice.
Due to the limited space of the workplaces 5 and 6, once two types of coating are applied, there will be a problem of cumbersome work procedures
In addition, since the second coating needs to be carried out immediately after the first coating, turbulent flow at the coating film interface is likely to occur, and a good coating appearance cannot be obtained.
[0017] In Japanese Patent Application Laid-Open No. 10-272415, a method of coating the inner panel portion and the boundary portion of the automobile body is disclosed when the outer panel portion of the automobile body is coated with 3 coatings and 1 baking method, but There is no description of the coating method of 4 coatings and 1 baking method

Method used

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  • Coating method of automobile body
  • Coating method of automobile body
  • Coating method of automobile body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0094] From the above, according to the first embodiment of the present invention, the automobile body with the laminated coating film formed on the outer plate portion, the inner plate portion and the boundary portion is sent into a sintering furnace to sinter the laminated coating film.

[0095] In the second embodiment of the present invention, no painting is carried out at the workplace 4, and the outer panel portion of the automobile body after the electrophoretic coating layer is formed is painted with a white-based coating by the first-stage coating machine 1. coating paint (1).

[0096] Next, in the workplace 5, a white base paint (2) is applied to the inner panel portion and the boundary portion of the automobile body after the electrophoretic coating layer is formed.

[0097] Then, the white base paint (2) is coated on the outer panel portion of the automobile body by the front-stage coating machine 2a in the second-stage coating machine 2.

[0098] Afterwards, the ...

Embodiment 1～3 and comparative example 1～4

[0124] Next, a laminated coating film to be formed on the inner panel portion and the boundary portion of the automobile body was formed on the base material using each of the paints produced as described above, and a painted panel was produced.

Embodiment 1

[0126] Such as figure 1 In the lamination sequence shown, the following steps are performed assuming the inner panel of the automobile body.

[0127] After zinc phosphate treatment was carried out on raw steel plate of 30cm×40cm and thickness of 0.8mm, an electrophoretic coating layer was formed using cationic electrophoretic paint “Power Top V-6” (manufactured by Nippon Paint Co., Ltd.) to form a base material.

[0128] On the base material on which the electrophoretic coating layer was formed, the above-mentioned water-based white-based intermediate coating was sprayed to make the dry film thickness 20 μm. After adjusting for 1 minute, preheating was performed at 80° C. for 3 minutes.

[0129] Next, the above-mentioned water-based white-based color primer was spray-coated on the white-based intermediate coating film, so that the dry film thickness was 8 μm. After spraying, after adjusting for 1 minute, preheating was performed at 80° C. for 3 minutes.

[0130] Then, the a...

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Abstract

The inventin provides a coating method fo automobile body. The coating method of an automobile body for forming a multilayer coating film on an electrodeposition coating film layer of an outer plate part, an inner plate part and a boundary part between the inner plate part and the outer plate part of an automobile body is disclosed, which comprises coating an outer plate part of an automobile bodyby a 4-coat 1-bake system including coating a white based intermediate paint with from N7 to N9.5 on an electrodeposition coating film layer, coating a white based color base paint with from N7 to N9.5 thereon by a wet-on-wet technique, coating a luster material-containing base paint containing a luster pigment thereon by a wet-on-wet technique, further coating a clear paint thereon by a wet-on-wet technique, and then baking for hardening a first multilayer coating film in the outer plate part of the automobile body; and carrying out at least one step of steps (A) and (B) and thereafter carrying out a step (C) with respect to an inner plate part and a boundary part of the automobile body, the step (A) including coating the white based intermediate paint in the inner plate part and the boundary part of the automobile body, prior to coating the white based intermediate paint in the outer plate part of the automobile body, the step (B) including coating the white based color base paint in the inner plate part and the boundary part of the automobile body, prior to coating the white based color base paint in the outer plate part of the automobile body, and the step (C) including coating a luster material-containing clear paint corresponding to a paint containing the luster pigment dispersed in the clear paint in the inner plate part and the boundary part of the automobile body, prior to coating the clear paint in the outer plate part of the automobile body.

Description

technical field [0001] The present invention relates to a coating method for an automobile body in which a laminated coating film is formed on an electrophoretic coating film layer on an outer panel part, an inner panel part, and a boundary part between the inner panel part and the outer panel part. Background technique [0002] Usually, the coating of the automobile body is to implement the middle coat coating on it after forming the electrophoretic coating film layer by electrophoretic coating, and then implement the top coat coating after the middle coat coating film is sintered and cured. [0003] When coating the topcoat with bright pigments such as aluminum flakes or mica powder, there are many cases where the base paint is applied to the middle coat film, and the base paint containing bright materials containing bright pigments is coated on it. , After coating the clear paint on it, the case where the coating is performed by the 3-coating-1-baking method of sintering ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/36B05D1/38B05D3/02C09D7/12C09D5/00C09D7/61
CPCC08K3/36B05D7/54C08K3/22C08K3/34C09D5/36C08K3/0033C09D7/1216B05D7/16C09D7/61C08K3/013
Inventor 大熊浩二
Owner NIPPON PAINT CO LTD