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Multi-layer coating film forming method

A multi-layer coating and coating technology, which is applied in chemical instruments and methods, coatings, layered products, etc., can solve the problems of coating film uniformity and poor water resistance, and achieve excellent water resistance and high turnover performance, excellent image clarity

Inactive Publication Date: 2008-07-02
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating film obtained by this coating film forming method sometimes has the problem of poor leveling and water resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] The preparation method of the hydroxyl-containing polyester resin (A1) is not particularly limited, and conventional methods can be used, for example, by heating the acid component (a1-1) and the alcohol component in a gaseous nitrogen stream at about 150 to about 250°C (a1-2) is carried out for about 5-10 hours to realize the esterification reaction or transesterification reaction of the acid component (a1-1) and the alcohol component (a1-2).

[0038] In the case of such an esterification or transesterification reaction of the acid component (a1-1) and the alcohol component (a1-2), the reactants may be added all at once or in portions. It is also possible to first synthesize a hydroxyl group-containing polyester resin and then react it with an acid anhydride to initiate half-esterification; or to first synthesize a carboxyl group-containing polyester resin and then add the alcohol component (a1-2) thereto.

[0039] In the case of the above esterification or transesteri...

Embodiment

[0164] Hereinafter, the present invention will be explained more specifically with reference to examples, but it should be understood that the present invention is not limited thereto. Hereinafter, "parts" and "%" mean "parts by mass" and "% by mass".

[0165] Preparation of hydroxyl-containing polyester resin solution (A1)

preparation Embodiment 1

[0167] Add 89 parts of neopentyl glycol, 20 parts of trimethylolpropane, 83 parts of isophthalic acid, 44 parts of adipic di acid and 23 parts of 1,2-cyclohexanedicarboxylic anhydride. After raising the temperature from 160°C to 230°C in the reactor over 3 hours, the water of condensation thus formed was distilled off with a water separator while maintaining 230°C. Continue the reaction until the acid value of the product reaches 3 mg KOH / g. Dilute the product to a solid content of 60% with a 50 / 50 (mass) xylene / SWAZOL 1000 (trade name, COSMO Oil Co. Ltd. aromatic hydrocarbon solvent derived from petroleum) mixed solvent to obtain a hydroxyl-containing polyester resin Solution (A1-1). The content of the alicyclic polybasic acid (a1-1-2) in the acid component (a1-1) of the obtained hydroxyl group-containing polyester resin was 16 mol% based on the total amount of the acid component (a1-1). The polyester resin had an acid value of 3 mgKOH / g, a hydroxyl value of 67 mgKOH / g, an...

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Abstract

The present invention relates to a method for forming a multilayer coating film. The invention provides a method for forming a multi-layer coating film with excellent uniformity, image clarity and water resistance by adopting a 3C1B system, comprising continuously coating a first colored paint, a water-based second colored paint and a coating object on a coated object The clear lacquer is hardened by simultaneously baking the first colored coat, the second colored coat and the clear coat thus formed.

Description

technical field [0001] The present invention relates to a method for forming a multi-layer coating film with excellent appearance through a 3-coating-1-baking system, comprising continuously coating a first colored paint, a water-based second colored paint and a transparent paint on an object to be coated Paint (clear paint), and thermally cure the obtained three-layer multi-layer coating film at the same time. Background technique [0002] As a method of forming a coating film on an automobile body, a method of forming a multilayer coating film by a 3-coat-2-bake (3C2B) system, which involves forming an electrophoretic coating film on an object, has been widely used After (electrocoated film), apply the middle coat → harden by baking → apply the base coat → apply the clear coat → harden by baking. However, recently, for the purpose of saving energy, the baking hardening step after the intermediate coating is applied is omitted, and a multilayer coating film is formed by a ...

Claims

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Application Information

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IPC IPC(8): B05D1/36B05D7/24B05D3/02B05D5/00C09D133/14C09D167/06B32B27/08
Inventor 汤川嘉之
Owner KANSAI PAINT CO LTD
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