Method for forming plural-layered coated film

A multi-layer coating film and coating film technology, which is applied to the surface coating liquid device, coating, polyurea/polyurethane coating, etc., can solve the problem that the surface smoothness of the multi-layer coating film is not fully improved.

Active Publication Date: 2004-12-01
นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even in this method, the surface smoothness of the multilayer coating film is not sufficiently improved, and therefore, it is still desired to improve the appearance of the multilayer coating film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] (A) Preparation of water-based surfacer

[0123] (preparation of pigment dispersion paste)

[0124] 4.5 parts of commercially available dispersant "Disperbyk 190" (nonionic anionic dispersant produced by Byk-Chemie, trade name), 0.5 parts of antifoaming agent "BYK-011" (antifoaming agent produced by Byk-Chemie agent), 22.9 parts of ion-exchanged water and 72.1 parts of rutile titanium dioxide are premixed, and the glass bead medium is added to the paint seasoning tank. The above-mentioned materials in the paint seasoning tank are mixed at room temperature and dispersed to form particles with a particle size of 5 microns or less A pigment dispersion paste was obtained.

[0125] (preparation of acrylic resin emulsion)

[0126] 445 parts of water and 5 parts of Neucol293 (manufactured by Nippon Nyukazai Co., Ltd.) were added to a reaction vessel equipped with a stirrer, thermometer, dropping funnel, reflux condenser to prepare a common acrylic-based resin emulsion and n...

preparation example

[0150] Synthetic Acrylic Emulsion

[0151] An acrylic resin emulsion (resin 2) having 40.6% of nonvolatile matter was polymerized in the same manner as in "Preparation of Resin 1" except that the following monomer mixture was used.

[0152] Methyl methacrylate

Embodiment 2-9 and comparative Embodiment 1-2

[0154] Except for the acrylic resin emulsion and polyurethane resin emulsion shown in Table 5 below, in the same manner as in Example 1, and using Tables 6 to 8, surfacers and multilayer coating films were formed and evaluated. The results are shown in Table 5.

[0155] acrylic

[0156] *The values ​​used as the basis for the calculation are shown in Table 10 and Table 11

[0157] Table 6

[0158] Resin 1

[0159] Table 7

[0160] resin type

[0161] Table 8

[0162] Melamine A

[0163] Table 9

[0164] ○

[0165] Example 1

[0166] Example 6

[0167] According to the method for forming a coating film of the present invention, a multilayer coating film having excellent surface smoothness can be formed while effectively avoiding phase mixing between the surfacer film and the primer film.

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Abstract

The present invention is to provide a method for forming a plural-layered coated film which is excellent in surface smoothness while phase mixing between an intermediate coating film and a base coating film is effectively prevented. The method comprises coating successively an aqueous intermediate coating paint, an aqueous base paint and a clear paint on an electrodeposition coated film in a wet-on-wet manner, and baking and curing them at the same time, wherein an intermediate coating film formed of the aqueous intermediate coating paint has a water absorption rate of coating film of 10% or less and a water dissolving rate of coating film of 5%, and the aqueous intermediate coating paint contains an acrylic resin emulsion, a urethane resin emulsion, and a curing agent.

Description

technical field [0001] The present invention relates to a kind of method for forming multi-layer coating film, and more specifically relate to a kind of utilizing three-coat one-bake (three-coat one-bake) method to form water-based surfacer film and outer coating film on automobile body Methods. Background technique [0002] The painting of the automobile body is mainly done by sequentially coating the electrodeposition coating film, the surfacer paint film and the outer coating film composed of the primer film and the clear paint film on the steel plate that needs to be coated. Hitherto, these coating films have been produced by applying a paint composition having a composition adjusted according to the functional variation of the coating film and baking and curing each coating film. When multiple paints are applied overlappingly, unless the bottom layer is completely film-formed and flat, the adjacent coating layers will affect each other, and the irregular bottom layer w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/04B05D7/00C09D175/04
CPCC09D175/04B05D7/572B05D2202/25C08L2666/16B05D7/04
Inventor 竹迫祥一濑川大介东井辉三山内正弘
Owner นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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