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Method for forming multi-layered coating film

A multi-layer coating, coating technology, applied in the direction of coating, device for coating liquid on the surface, special surface, etc., can solve problems such as reflection or interference light affecting the coating light

Pending Publication Date: 2020-11-13
นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is that the orientation state of the scaly pigment greatly affects the reflection of light in the coating film or the appearance of interference light

Method used

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  • Method for forming multi-layered coating film
  • Method for forming multi-layered coating film

Examples

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preparation example Construction

[0054] In the preparation of an acrylic resin emulsion, emulsion polymerization can be performed by heating the above monomer mixture under stirring in an aqueous medium in the presence of a radical polymerization initiator and an emulsifier. The reaction temperature may be, for example, about 30 to 100°C. The reaction time can be appropriately selected according to the reaction scale and reaction temperature, and may be, for example, about 1 to 10 hours. In emulsion polymerization, for example, the monomer mixture or monomer pre-emulsion can be added at one time or dropwise for a short time to a reaction vessel containing water and an emulsifier. By appropriate choice of such a program, the reaction temperature can be adjusted.

[0055] As said radical polymerization initiator, the well-known initiator which can be used for the emulsion polymerization of an acrylic resin can be used. Radical polymerization initiator Specifically, as a water-soluble radical polymerization in...

preparation example 1

[0182] Preparation Example 1 Preparation of Acrylic Resin Emulsion

[0183] 330 g of deionized water was added to the reaction vessel, and the temperature was raised to 80° C. while mixing and stirring in a nitrogen stream. Next, 11.25 parts of acrylic acid, 139 parts of n-butyl acrylate, 75 parts of methyl methacrylate, 187 parts of n-butyl methacrylate, 75 parts of 2-ethylhexyl methacrylate, 150 parts 2-hydroxyethyl methacrylate, 112 parts of styrene, 11.2 parts of チオカルルコール 20 (n-dodecyl mercaptan, manufactured by Kao Corporation, the active ingredient is 100%) and 74.3 parts of LATEMUL PD-104 (emulsifier , manufactured by Kao Corporation, the active ingredient is 20%) and 3% in the monomer emulsion composed of 300 parts of deionized water, and an initiator solution composed of 2.63 parts of ammonium persulfate and 90 parts of deionized water 30% of the amount was added dropwise to the reaction vessel in parallel over 15 minutes. After completion of the dropwise addition, ...

preparation example 2

[0186] Preparation Example 2 Preparation of Polyester Aqueous Dispersion

[0187] Add 250 parts of trimethylolpropane, 824 parts of adipic acid, and 635 parts of cyclohexanedicarboxylic acid into a reaction vessel equipped with a stirrer, nitrogen introduction pipe, temperature control device, condenser, and decanter, and heat up To 180 ° C, the polycondensation reaction was carried out until no water distilled out. After cooling to 60° C., 120 parts of phthalic anhydride was added, the temperature was raised to 140° C., and the temperature was maintained for 60 minutes to obtain a polyester resin having a number average molecular weight of 2,000 measured by GPC. Add 59 parts of dimethylaminoethanol (equivalent to 80% of the acid value of the resin (neutralization rate is 80%)) at 80°C, and then put in 1920 parts of deionized water and stir to obtain a resin solid The component is an aqueous polyester dispersion of 45% by mass. The resin solid content equivalent hydroxyl val...

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Abstract

Provided is a novel means for improving the orientation of a scale-like luster pigment in the formation of a multi-layered coating film including a coating film containing the luster pigment. A methodfor forming a multi-layered coating film, comprising an intermediate coating step of applying a water-based intermediate coating material composition (A) onto the surface of an object of interest toform an uncured water-based intermediate coating film, a first water-based base coating step of applying a first water-based base coating material composition (B) onto the uncured water-based intermediate coating film to form an uncured first water-based base coating film, a second water-based base coating step of applying a second water-based base coating material composition (C) containing a scale-like luster pigment onto the uncured first water-based base coating film to form an uncured second water-based base coating film, a clear coating step of applying a clear coating material composition (D) onto the uncured second water-based base coating film to form an uncured clear coating film, and a curing step of heat-curing the obtained uncured water-based intermediate coating film, the uncured first water-based base coating film, the uncured second water-based base coating film and the uncured clear coating film at one time to form a multi-layered coating film, wherein the solid matterconcentration (% by mass) in each of the uncured first water-based base coating film and the uncured second water-based base coating film satisfies a specified requirement.

Description

technical field [0001] The present invention relates to a method for forming a multilayer coating film comprising a coating film containing a scaly bright pigment. Background technique [0002] On the surface of the object to be coated, such as an automobile body, a multilayer coating film with various functions is sequentially formed, thereby protecting the object to be coated, and imparting a beautiful appearance and excellent design. As a method of forming such a multilayer coating film, a general method is to form an undercoat film such as an electrodeposition coating film on an object having excellent conductivity, and then sequentially form an intermediate coating film and a top coating film thereon. Among these coating films, especially a top coating film composed of a base coating film and a clear coating film has a great influence on the appearance and design of the coating film. Especially in automobiles, the appearance and design of a topcoat film formed on a veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/36B05D5/06
CPCB05D7/572B05D5/06B05D2401/20B05D2350/10B05D3/0272B05D1/04B05D5/066B05D2451/00B05D7/574B05D2401/10C08K2003/2237C09D133/10C09D179/02
Inventor 西村彰宽
Owner นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี
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