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Multilayer coating film forming method

A multi-layer coating film and coating film technology, which is applied in coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve the problems of small gloss difference, difficult finishing, and insufficient characteristics of the coating film, and achieve the goal of coating The effect of small difference in film gloss

Active Publication Date: 2016-07-20
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. When the coating film is drying, the heat capacity of the object to be coated is large, the heat of the drying furnace cannot be transferred sufficiently, and the curing property of the coating film is not sufficient
Therefore, in the wet-on-wet coating method with few drying steps, it is not easy to obtain a coated article with a small difference in glossiness of the coating film due to finishing performance, corrosion resistance, and firing temperature.
[0005] 2. Since there are many vertical parts in construction machinery or industrial machinery, the uncured coating film may sag due to wet-on-wet coating, and the finish may be unstable depending on the part
[0006] 3. Since construction machinery and industrial machinery are used outdoors, there are issues such as the following: requirements for coating film hardness, corrosion resistance, and weather resistance, etc.
[0009] However, in the coated articles obtained by the coating film forming methods described in Patent Documents 1 and 2, any one of the finishing properties, corrosion resistance, weather resistance, chipping resistance, and difference in gloss of the coating film due to firing temperature is small. Insufficient characteristics, looking for improvement

Method used

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Embodiment

[0131] Hereinafter, the present invention will be described in more detail with reference to production examples, examples, and comparative examples, but the present invention is not limited thereto. "Part" in each example shows a mass part, and "%" shows a mass %.

[0132] Manufacture of primer coating composition

manufacture example 1

[0133] Production Example 1 Production Example of Primer Coating Composition No. 1

[0134] Primer coating composition No. 1 was obtained through the following steps 1 to 2.

[0135] Process 1:

[0136] Arakide 9205 (Note 2) 50 parts (solid content), Zinc oxide (Note 4) 10 parts, Ti-Pure (Ti-Pure) R-902 (Note 6) 70 parts, LAKABARSF (Note 8) 40 parts, Neolight SA- To 70 parts of 200 (note 10), an appropriate amount of Suwazel 1000 (manufactured by Cosmo Petroleum Co., Ltd., an aromatic hydrocarbon solvent) was added and dispersed with a sand mill to obtain a pigment dispersion paste.

[0137] Process 2:

[0138] 50 parts of Arakid 9205 (Note 2) (solid content), 1 part of Disparlon (DISPARLON) A603-20X (Note 15) were mixed with the pigment dispersion paste obtained above, and Suwazoru 1000 (manufactured by Cosmo Petroleum Co., Ltd., aromatic hydrocarbon solvent) and stirred to adjust the solid content to obtain primer coating composition No. 1 with a solid content of 70%.

...

manufacture example 18

[0168] Production Example 18 Production of Acrylic Resin Solution

[0169] 28 parts of Suwazel 1000 (manufactured by Cosmo Petroleum Co., Ltd., aromatic hydrocarbon solvent), 85 parts of toluene, 41.6 parts of styrene, 6.9 parts of n-butyl acrylate, 19 parts of isobutyl methacrylate, Praxel FM-3 (note 17) 15 parts, 17 parts of 2-hydroxyethyl methacrylate, 0.5 parts of acrylic acid, and 8 parts of di-tert-butyl hydroperoxide were reacted at 110° C. under nitrogen to obtain an acrylic resin solution. The acid value of the resin solid content of the obtained acrylic resin solution was 3.9 mgKOH / g, the hydroxyl value was 94.9 mgKOH / g, and the weight average molecular weight was 11,000.

[0170] (Note 17) Praxel FM-3: Daicel Chemical Co., Ltd., trade name, ε-caprolactone-modified vinyl monomer of 2-hydroxyethyl acrylate

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Abstract

The invention provides a multilayer coating film forming method. The invention provides a coating article through wet-on-wet coating, which has excellent finish machining performance, anti-corrosion property, weather fastness and cracking resistance, and low coating glossiness difference caused by burning and fixing. The multilayer coating film forming method forms an uncured coating employing a primer coating compound (A) on a coated subject, forms a finishing coat coating employing a specific finishing coat coating compound (B) on the uncured coating, and simultaneously dries the two coatings, wherein the primer coating compound (A) includes epoxy resin (a1), and 1-70 parts by mass of a rust resisting pigment (a2), 40-150 parts by mass of a tinting pigment (a3) and 40-150 parts by mass of a filler pigment (a4) employing 100 parts by mass of solid components of the epoxy resin (a1) as a standard; the total weight of the solid components of the epoxy resin (a1) is 100g; the total oil absorption of the rust resisting pigment (a2), the tinting pigment (a3) and the filler pigment (a4) is 16-50 ml.

Description

technical field [0001] The present invention relates to a method for forming an uncured coating film using a primer coating composition on an object to be coated, and performing wet-on-wet coating of a topcoat coating composition on the uncured coating film, and using the method to obtain Coated articles with excellent finishing properties, corrosion resistance, weather resistance, and chipping resistance, and a small difference in gloss of the coating film caused by firing temperature. Background technique [0002] There is a coating method called wet-on-wet as follows: After the primer coating composition is applied to the object to be coated, the primer coating composition is not dried and the topcoat coating composition is applied, and then the two coatings are applied. The films are dried at the same time, whereby the process can be shortened. [0003] Recently, a wet-on-wet coating method is used in order to shorten the process for coating construction machines such a...

Claims

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Application Information

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IPC IPC(8): B05D7/00C09D125/14C09D133/10C09D163/00C09D5/08C09D7/12
CPCB05D7/542B05D2502/00B05D2504/00B05D2518/00C09D5/08C09D125/14C09D133/10C09D163/00C09D7/61C08L75/08C08K2003/3045B05D2420/01B05D2420/02
Inventor 竹中俊喜藤田充博津田裕久胜田英明
Owner KANSAI PAINT CO LTD
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