Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for forming multilayer coating film

A multi-layer coating film and coating film technology, which is applied in coatings, polyurea/polyurethane coatings, devices for coating liquid on the surface, etc., can solve problems such as scratches on the surface of the coating film, and achieve a good appearance of the coating film. The effect of scratch resistance

Active Publication Date: 2020-06-30
นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี +1
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the clear coating film constituting the uppermost layer of the multilayer coating film may be scratched on the surface of the coating film due to contact with a brush or the like during car washing, for example.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for forming multilayer coating film
  • Method for forming multilayer coating film
  • Method for forming multilayer coating film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0053]In the preparation of the above-mentioned acrylic resin emulsion, the main skeleton of the acrylic resin is constituted by including an alkyl (meth)acrylate monomer in the monomer mixture. Specific examples of alkyl (meth)acrylate monomers include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate , Isobutyl (meth)acrylate, tert-butyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, (meth)acrylate ) nonyl acrylate, decyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, etc.

[0054] The content of the alkyl (meth)acrylate monomer is preferably 50 to 98% by mass, more preferably 65 to 96% by mass based on the total amount of the monomer mixture used for the synthesis of the acrylic resin emulsion. Alkyl (meth)acrylate monomers may be used alone or in combination.

[0055] In addition, in this specification, (meth)acrylic acid means acrylic acid and / or methacrylic acid.

[0056...

Embodiment

[0235] The present invention will be further specifically described based on the following examples, but the present invention is not limited thereto. In the examples, "parts" and "%" are based on mass unless otherwise specified.

[0236] First waterborne base coating composition

manufacture example 1

[0237] Production example 1 Production of hydroxyl-containing acrylic resin emulsion

[0238] 445 parts of water and Newcol 293 (manufactured by Nippon Emulsifier Co., Ltd.) 5 portion, while stirring, the temperature was raised to 75°C.

[0239] 24.6 parts of monomer mixture containing 5 parts of styrene, 78.11 parts of 2-ethylhexyl acrylate, 16.25 parts of hydroxyethyl methacrylate and 0.64 parts of acrylic acid, 240 parts of water and Newcol 293 (Japanese emulsification Co., Ltd.) 30 parts of the mixture was emulsified, and this monomer pre-emulsion was added dropwise to the above-mentioned reaction vessel within 3 hours while stirring. While dripping the monomer pre-emulsion, 1 part of APS (ammonium persulfate) was dissolved in 50 parts of water as a polymerization initiator, and the resulting aqueous solution was evenly added dropwise to the above-mentioned reaction vessel until the above-mentioned monomer pre-emulsion until the end of the dropwise addition. After com...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
hydroxyl valueaaaaaaaaaa
acid valueaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
Login to View More

Abstract

To provide a method for forming a multilayer coating film having a clear coating film excellent in scratch resistance and having an excellent coating film appearance. A method for forming a multilayercoating film involves forming an uncured coating film by applying a first aqueous base coating composition, forming an uncured coating film by applying a second aqueous base coating composition, forming an uncured coating film by applying a clear coating composition, and simultaneously heat curing the obtained coating films, wherein the first aqueous base coating composition contains a carbodiimide compound, the clear coating composition contains a hydroxyl group-containing acrylic resin (A) having a hydroxyl value of 120 to 160 mgKOH / g and an acid value of 5 to 10 mgKOH / g, a polyisocyanate compound (B), and a polycarbonate diol compound (C), wherein the component (A) has a hydroxyl group-containing alkyl moiety having 3 or less carbon atoms, and the ratio of the numbers of moles of the isocyanate functional groups of the component (B) and the hydroxyl group functional groups of the component (A) is 1.15 to 1.35.

Description

technical field [0001] The present invention relates to a method for forming a multilayer coating film. Background technique [0002] On the surface of the object to be coated, such as an automobile body, multiple coating films with various functions are sequentially formed to protect the object to be coated while imparting a beautiful appearance and excellent design. As a method of forming such a plurality of coating films, for example, for steel sheets, an undercoating film such as an electrodeposited coating film is generally formed on an object to be coated with excellent electrical conductivity, and an intermediate coating film, a base coating film, and an intermediate coating film are sequentially formed thereon. Method of clear coating film. Conventionally, the three-layer laminated coating film of the intermediate coating film, the base coating film and the clear coating film is formed by applying the coating film one by one, followed by baking and curing. [0003]...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/38B05D5/00B05D5/06B05D7/24
CPCB05D1/38B05D5/00B05D7/572B05D7/574B05D7/24B05D5/061B05D2451/00B05D2502/00B05D2425/01C08G73/0655C09D179/08C08G18/758C08G18/797C08G18/283C08G18/4829C08G18/8061C08G18/6229C08G18/4277C08G18/44C08G18/4202C08G18/4063C09D175/06C09D7/70C09D5/36C08K3/013C09D175/14
Inventor 杉本胜彦长谷真子三石浩嗣安保启司
Owner นิปปอน เพนท์ ออโตโมทีฟ โคทติ้งส์ โค แอลทีดี