Method for the formation of multi-layer paint films

A paint film and varnish technology, applied in the field of forming multi-layer paint films, can solve the problems of unclear obtaining method, unable to obtain paint film value, unable to obtain chipping resistance, etc., and achieve excellent chipping resistance and good paint film. effect of appearance

Inactive Publication Date: 2012-02-01
BASF COATINGS JAPAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although this method describes the paint film properties of the first layer, how it is obtained is not clear, and according to the detailed description of the invention, unless a solvent-based paint that causes VOC emission control problems is used for the first layer, it cannot be obtained. The given film value is obtained and there is a problem that good chip resistance cannot be obtained

Method used

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  • Method for the formation of multi-layer paint films
  • Method for the formation of multi-layer paint films

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1-10

[0097] Water-based first colored primers A-1 to A-5 and water-based second colored primers B-1 to B-5 Example

[0098] Water-based first colored primers A-1 to A-5 and water-based second colored primers B-1 to B-5 were prepared according to the mixing ratio shown in Table 1. In Table 1, the unit of the amount of each component is parts by mass.

[0099]The first water-based colored primer and the second aqueous colored primer are prepared by the mixing ratio shown in Table 1 by the following method: carbon black (trade name MA-100, produced by Mitsubishi Kagaku), talcum pigment (trade name Talc LMS-200, produced by Fuji Talc Kogyo) and true pigment (trade name barium sulfate B34, produced by Sakai Kagaku) ​​were added to polyester resin emulsion E-2, and dispersed in a disperser, and then polyurethane resin solution U was added -1. Melamine resin (trade name Cymel 327, methylated melamine resin produced by Cytec Co., 90% non-volatile matter), polypropylene glycol (trade na...

preparation Embodiment 11

[0102] The preparation embodiment of two-liquid urethane type paint C-1

[0103] Hydroxyl-containing acrylic resin solution R-1 (70 parts), 1.3 parts of ultraviolet absorber, Tinuvin400 (trade name, produced by Ciba Specialty Chemicals Co.), 0.7 part of light stabilizer, Tinuvin292 (trade name, produced by Ciba Specialty Produced by Chemical Co.), 0.2 parts of surface conditioner, BYK-300 (trade name, produced by BYK Chemie Co.), 5 parts of diethylene glycol monobutyl ether, 12.8 parts of n-butyl acetate, and 10 parts of aromatic naphtha Oil Solvesso 100 (trade name, produced by Esso Co.) was sequentially introduced into the dissolver and mixed therein until the system became uniform. Then 33.3 parts of aliphatic polyisocyanate solution Basonat HI-172S (trade name, produced by BASF Co., 72% solution of HDI-based isocyanate type trimer) was added to obtain two-liquid urethane type paint C-1.

Embodiment 1-5

[0105] Cationic electrodeposition paint V-50 (trade name, produced by Nippon Paint Co.) was electrostatically deposited in such a manner as to provide a cured film thickness of about 20 μm on the alloyed hot-dip galvanized steel sheet treated with zinc phosphate chemical forming, and then Heat to 160°C for 30 minutes and cure.

[0106] The water-based first colored primer shown in Table 2 was applied on the cured paint film of the electrodeposition paint using a rotary cup type electrostatic coater so that the thickness of the cured film was 7-12 μm to form the first colored primer film, after standing in the paint booth for 5 minutes, the water-based paint shown in Table 2 was applied on the first pigmented primer film using a rotary cup type electrostatic coater in such a way that the cured film thickness was 5-10 μm. A second colored primer and forms a second colored primer film. It was left to stand in the spray booth for 5 minutes, and then heated to 80° C. for 3 minutes...

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Abstract

To provide a method for forming a multi-layer paint films which have excellent chipping resistance without losing the appearance of the paint film with a three-coat one-bake method in which aqueous colored base paints are used. A method for the formation of multi-layer paint films in which an aqueous first colored base paint (A) is coated on an electro-deposition paint cured paint film and a first colored base paint film is formed, then an aqueous second colored base paint (B) is coated on the first colored base paint film without preliminary heating of the first colored base paint film and a second colored base paint film is formed, and then a clear paint (C); is coated on the second colored base paint film after preliminary heating of the first colored base paint film and second colored base paint film and a clear paint film is formed and the three paint films which have been formed are heated and cured at the same time, which is characterized in that talc pigment is included in each of the aqueous colored first base paint (A) and aqueous colored second base paint (B) in an amount of from 1 to 5 mass% with respect to the total resin solid fraction of each of said aqueous colored first base paint (A) and aqueous colored second base paint (B).

Description

[technical field] [0001] The present invention relates to a method of forming a multi-layer paint film, more particularly, to a method of forming a multi-layer paint film by forming a three-coat-one-bake paint film using a water-based paint for automotive exterior covers When used, it can provide good film appearance and chip resistance. [Background technique] [0002] A method of forming a multilayer paint film on an object to be coated with a three-coat-one-bake system as follows is known as a method for forming a water-based three-coat-one-bake ( 3C1B) A method for a multilayer film comprising steps 1-5 as described below and using a waterborne first pigmented paint (A), a waterborne second pigmented paint (B) and a clearcoat (C). Step 1: A step of applying a water-based first colored paint (A) comprising a urethane emulsion (a) and other components (b). Step 2: by standing at normal temperature, the paint film viscosity of the first water-based colored paint (A) is adj...

Claims

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Application Information

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IPC IPC(8): B05D7/00
CPCB05D7/577B05D2601/20B05D7/572
Inventor 塚本英史前河正纯水野重行山根贵和古贺一阳中野萨库拉
Owner BASF COATINGS JAPAN
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