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Process for forming multi layered coated film and multi layered coated film

a coating film and multi-layer technology, applied in the field of multi-layer coating film formation, can solve the problems of degrading the finished appearance of the laminated coating film, and achieve the effects of reducing cost, good finished appearance, and saving energy

Inactive Publication Date: 2005-07-28
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] A main object of the present invention is to provide a process for forming a multi layered coated film having good finished appearance in a three coat one bake coating process which can save energy and reduce cost.
[0009] In the present invention, a process for obtaining a coated film having good finished appearance has been found. In according to the process of the present invention, a multi layered coated film having good appearance can be obtained even in the three coat one bake coating process having smaller number of baking step. The multi layered coated film contains an electrodeposition coated film, an intermediate coated film, a base top coated film and a clear top coated film. In according to the process of the present invention, energy required for baking and curing in the coating step can be saved, and production cost can be reduced. The process of the present invention can be suitably used in the art that energy saving during the application and good appearance are required.

Problems solved by technology

The solvent absorbed in the cured electrodeposition coated film is volatilized during baking the laminated coated film to affect the intermediate coated film and the like, which degrades the finished appearance of the laminated coated film.

Method used

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  • Process for forming multi layered coated film and multi layered coated film
  • Process for forming multi layered coated film and multi layered coated film
  • Process for forming multi layered coated film and multi layered coated film

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0133] Preparation of Amine Modified Epoxy Resin

[0134] 92 parts of 2,4- / 2,6-tolylenediisocyanate (weight ratio=8 / 2), 95 parts of methyl isobutyl ketone (hereinafter, referred to as MIBK) and 0.5 part of dibutyltin dilaurate were loaded to a flask equipped with a stirrer, a cooling tube, a nitrogen introducing tube, a thermometer and a dropping funnel. 21 parts of methanol was added while stirring the reaction mixture. Starting at room temperature, the reaction mixture was allowed to rise to 60° C. by exothermic, the reaction was retained for 30 minutes, and 50 parts of ethylene glycol mono-2-ethylhexyl ether was dropped from the dropping funnel. Furthermore, 53 parts of bisphenol A-propylene oxide 5 mol adduct was added. The reaction was carried out mainly in the temperature range of 60 to 65° C., and continued until absorption based on an isocyanate group disappeared in IR spectrum measurement.

[0135] Next, 365 parts of epoxy resin of epoxy equivalent 188 synthesized from bispheno...

preparation example 2

[0137] Preparation of Block Polyisocyanate Curing Agent (1)

[0138] 1250 parts of diphenylmethane diisocyanate, 266.4 parts of MIBK were loaded to a reaction vessel, and 2.5 parts of dibutyltin dilaurate were added thereto after heating to 80° C. A solution of 226 parts of ε-caprolactam dissolved in 944 parts of butylcellsolve was dropped thereto at 80° C. over 2 hours. The reaction was retained at 100° C. for 4 hours, it was confirmed that absorption based on an isocyanate group disappeared in IR spectrum measurement, and left to be cooled. 336.1 parts of MIBK were added and thereby, a blocked isocyanate curing agent having a glass transition temperature of 0° C. was obtained.

preparation example 3

[0139] Preparation of Pigment Dispersing Resin

[0140] 222.0 parts of isophorone diisocyanate (hereinafter, referred to as IPDI) was loaded in a reaction vessel equipped with a stirrer, a cooling tube, a nitrogen introducing tube and a thermometer, and after diluted with 39.1 parts of MIBK, 0.2 part of dibutyltin dilaurate was added. Then, the reaction mixture was heated to 50° C., and 131.5 parts of 2-ethyl hexanol was dropped under dry nitrogen atmosphere over 2 hours with stirring. Reaction temperature was kept at 50° C. by cooling as necessary. As the result, 2-ethyl hexanol half blocked IPDI (resin solid content: 90.0%) was obtained.

[0141] 87.2 parts of dimethylethanolamine, 117.6 parts of 75% aqueous solution of lactic acid, and 39.2 parts of ethylene glycol monobutyl ether were added to a suitable reaction vessel, the reaction mixture was stirred at 65° C. for half an hour to prepare a quaternarizing agent.

[0142] Subsequently 710.0 parts of EPON 829 (bisphenol A type epoxy r...

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Abstract

The present invention provides a process for forming a multi layered coated film having good finished appearance. The present invention relates to a process for forming a multi layered coated film comprising the steps of conducting electrodeposition coating with a cationic electrodeposition coating composition on a substrate, and then heating and curing it to form an cured electrodeposition coated film on the substrate, applying an intermediate coating composition on the cured coated film to form an uncured intermediate coated film, applying a base top coating composition on the uncured intermediate coated film to form an uncured base coated film, applying a clear top coating composition on the uncured base coated film to form an uncured clear coated film, and simultaneously heating and curing the three uncured coated films, wherein the cured electrodeposition coated film has specified ranges of Ra and Pa; or has specified ranges of Tg and crosslinking density.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a process for forming a multi layered coated film having good finished appearance. BACKGROUND OF THE INVENTION [0002] Multi layers of coated films having various functions are formed on the surface of a substrate of automobile body to protect the substrate and impart the substrate into good appearance. However, in recent years, a process for forming a multi layered coated film comprising the steps of: applying the next coated film on an uncured coated film by so-called wet on wet coating; and simultaneously baking the multi layers; without the step of baking the uncured coated film after applying every layer has been used because of a requirement of saving energy and reducing cost. [0003] As an example of the process, a three coat one bake coating process (three wet coating) comprising the steps of: applying an intermediate coating, a base top coating and a clear top coating on an cured electrodeposition coated film by w...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B05D1/36B05D1/38B05D7/00C09D5/44C23C26/00C23C28/00
CPCB05D7/572B05D7/577C23C28/00C23C26/00C09D5/4488A45B23/00A47F5/16B60B2200/20G09F13/0404G09F23/06
Inventor TOI, TERUZOMIHARA, YASUO
Owner NIPPON PAINT CO LTD
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