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Method for forming multilayer coating film

A multi-layer coating and coating technology, which is applied to devices, coatings, conductive coatings and other directions for coating liquids on the surface. It can solve the problems of inability to ensure quality requirements, and achieve the effects of excellent appearance and excellent low temperature impact resistance.

Inactive Publication Date: 2019-11-15
BASF COATINGS GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of using the aqueous primer composition on an electrodeposited film formed on a steel sheet for motor vehicles, it may not be possible to ensure sufficiently strict quality requirements in terms of chipping resistance in a low-temperature environment

Method used

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  • 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 Embodiment 1

[0149] The invention will now be elucidated in more detail by using working examples, without being limited thereto. In the working examples, the term "part" means "part by mass", and the use of the symbol "%" in relation to the mixing amount and content value means "% by mass" unless otherwise clearly stated.

[0150] The non-chlorinated polyolefin resin aqueous dispersion used in the present invention is prepared using the following three-step method.

[0151] (i) The first step: preparation of non-chlorinated polyolefin resin

[0152] 110 mL of deionized water, 22.2 g of magnesium sulfate heptahydrate, and 18.2 g of sulfuric acid were placed in a 1000 mL round bottom flask and dissolved with stirring. 16.7 g of commercially available granular montmorillonite was dispersed in the solution, heated to 100° C. and stirred for 2 hours. The dispersion was then cooled to room temperature and the resulting slurry was filtered to recover a wet cake. The recovered filter cake wa...

preparation Embodiment 2

[0160]

[0161] Aqueous primer composition WP-1 was prepared by mixing 1.66 parts of conductive carbon black "Printex XE2B" (manufactured by Degussa), 12.55 parts of titanium dioxide "JR600-E" (manufactured by Tayca Corp.) and 0.93 parts of pigment dispersant "Disperbyk 191" (produced by BYK Chemie, solid content 98%, acid value 31 mg KOH / g, amine value 20 mgKOH / g) was added to 26.5 parts of polyurethane resin "Impranil DLU" (produced by Covestro Japan Ltd., solid Resin content is 60%, Tg is -83 ℃, elongation is 800%), disperse these components by means of a disperser, add 21.0 parts of non-chlorinated polyolefin resin aqueous dispersion P-1, 1.5 parts of curing agent "DURANATE WM4 4-L70G" (a water-dispersible blocked polyisocyanate compound produced by Asahi Kasei Chemicals Corporation with a solid resin content of 70%), 33.96 parts of deionized water, 0.8 parts of leveling agent "BYK-348" (produced by BYK Chemie) and 1.1 parts of thickener "Rheovis AS S130" (manufactured b...

preparation Embodiment 3

[0162]

[0163] Using the same method as used in Preparation Example 2, water-based primer compositions WP-2 to WP-18 were obtained based on the formulations shown in Table 1.

[0164] [Table 1]

[0165] Table 1-1

[0166]

[0167] Table 1-2

[0168]

[0169]

[0170] Details of the mixing components shown in Table 1 are as follows.

[0171] (*1) Acrit WBR-2181 (manufactured by Taisei Fine Chemical Co., Ltd., solid resin content 33%, Tg -89°C, elongation 700%)

[0172] (*2) Permarin UA-150 (manufactured by Sanyo Chemical Industries, Ltd., solid resin content 30%, Tg -87°C, elongation 600%)

[0173] (*3) Ucoat DA-100 (produced by Sanyo Chemical Industries, Ltd., solid resin content of 35%, Tg of -80°C, elongation of 500%)

[0174] (*4) Takelac W6061 (manufactured by Mitsui Chemicals, Inc., 30% solid resin content, -78°C Tg, 1000% elongation)

[0175] (*5) Bayhydrol UH2952 / 1 (manufactured by Covestro Japan Ltd., solid resin content 40%, Tg -49°C, elongation 530%) ...

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Abstract

To improve the appearance, chipping resistance, adhesive properties and low temperature impact properties of a coating film. The method for forming a multilayer coating film of the present invention comprises coating an aqueous primer coating composition, an aqueous first colored coating composition, an aqueous second colored coating composition and a clear coating composition in that order. The aqueous primer coating composition contains a component (A) which contains a polyolefin resin having a melting point of 60DC to 100DC and a weight average molecular weight of 50,000-250,000, a component (B) which contains a polyurethane resin having a glass transition temperature of -100DC to -70DC and an elongation percentage of 500% or more, a curing agent (C) and electrically conductive carbon (D). The aqueous first colored coating composition and aqueous second colored coating composition each contain a core / shell emulsion. The clear coating composition contains a hydroxyl group-containingacrylic resin containing 20 mass% or more of t-butyl methacrylate, a polyisocyanate and a melamine resin, and a coating film of the clear coating composition has a glass transition temperature of 70DCor higher and an elongation percentage of 3% or less.

Description

[technical field] [0001] The present invention relates to a new method for preparing multilayer coating films using an aqueous coating composition, which can be used in various technical fields, especially in the field of motor vehicle coating. [Background technique] [0002] Generally, a method of forming a multilayer coating film in which the object to be coated is a motor vehicle body includes forming an electrodeposited film on the object to be coated, curing the electrodeposited film by heating, and then forming Multilayer coating films of films and clearcoats. In recent years, due to environmental concerns, water-based films have begun to be used as intermediate and basecoat films to reduce the use of volatile organic components (VOC). In addition, in recent years, in order to improve fuel economy, vehicle bodies have become lighter and materials for vehicle bumpers have become thinner. [0003] In order to reduce energy consumption, many methods currently used to fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/00C08J7/043C08J7/044
CPCC09D5/00C08J7/043C08J7/042C08J7/044B05D7/572C08J2323/12C08J2355/02C08J2369/00C08J2423/02C08J2433/04C08J2475/04C08J2475/06C08J2475/08C09D5/002C09D5/022C09D5/24C09D123/02C09D133/04C09D175/04C09D175/06C09D175/08B05D7/5723B05D2520/00B05D2520/05
Inventor 仓科融新村和彦角田岳近藤益雄小岛启介
Owner BASF COATINGS GMBH
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