Process for forming multilayer coating film

A multi-layer coating and coating technology, which can be applied to devices, coatings, polyester coatings and other directions for coating liquids on the surface, can solve the problems of reduced smoothness of the coating film, water-resistant adhesion, and reduced chipping resistance, etc. To achieve the effect of excellent water resistance and adhesion, excellent smoothness

Active Publication Date: 2015-07-22
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in the 3-coat 1-bake method in which three uncured coating films are painted on top of each other, when a polyester resin having a low molecular weight is used for the bottommost layer of the aqueous intermediate coating composition, since the upper layer Sag occurs due to the weight of the uncured coating film, so the smoothness of the resulting coating film is usually reduced
In addition, when a polyester resin having a low molecular weight is used as a resin for forming a coating film, the film properties of the resulting coating film, such as water adhesion resistance and chipping resistance, often decrease

Method used

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  • Process for forming multilayer coating film
  • Process for forming multilayer coating film
  • Process for forming multilayer coating film

Examples

Experimental program
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Embodiment

[0452] With reference to Examples and Comparative Examples, the present invention will be described in more detail below. However, the present invention is not limited to these examples. In the examples, "parts" and "%" are expressed based on mass. The thickness of the coating film refers to the thickness of the coating film when cured.

[0453] Preparation of acrylic modified polyester resin (A)

preparation example 1

[0455] Combine 85 parts of hexahydrophthalic anhydride, 51.6 parts of adipic acid, 39.1 parts of 1,6-hexanediol, 34.8 parts of neopentyl glycol, 35.3 parts of 2-butyl-2-ethyl-1,3- Propylene glycol, 2.16 parts of maleic anhydride, and 30.1 parts of trimethylolpropane were placed in a reaction vessel equipped with a thermometer, thermostat, stirrer, heating unit, and distillation column, and the mixture was heated to 160°C while stirring. Subsequently, the mixture was gradually heated from 160°C to 240°C for 4 hours, and the resulting condensation water was distilled out through a distillation column. After allowing the reaction to proceed at 240°C for 90 minutes, the distillation column was replaced with a water separator. About 15 parts of toluene was added to the mixture to azeotrope water and toluene, and condensation water was removed. The acid value measurement was started 1 hour after the addition of toluene, and the heating was stopped when the acid value was confirmed t...

preparation example 2 to 10

[0459] Acrylic-modified polyester resin aqueous dispersions (A-2) to (A-10) were synthesized in the same manner as Preparation Example 6, but the formulation shown in Table 1 was used.

[0460]

[0461] Preparation of blocked polyisocyanate compound (B)

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Abstract

The present invention addresses the problem of providing a process for forming a multilayer coating film which exhibits excellent smoothness, image clarity, water resistance, adhesiveness, and pinholing resistance, said process being capable of forming, even in a case where a coating material is stored and thereafter applied, a multilayer coating film which exhibits excellent water resistance and adhesiveness. A process for forming a multilayer coating film which includes applying successively a first aqueous pigmented coating material and a second aqueous pigmented coating material onto a substrate to be coated and simultaneously curing the first and second aqueous pigmented coating materials by heating, characterized in that the first aqueous pigmented coating material contains both an acryl-modified polyester resin and a blocked polyisocyanate compound which has a specific blocked isocyanate group.

Description

Technical field [0001] Cross reference of related technologies [0002] This application claims the priority of Japanese Patent Application No. 2012-219561 filed on October 1, 2012, and the entire disclosure of the application is incorporated herein by reference. [0003] The present invention provides a method for forming a multilayer coating film with excellent appearance and coating film performance by sequentially applying an aqueous coating composition. Background technique [0004] The 3-coating 2-bake method and the 2-coating 2-bake method have been widely used as a method of forming a coating film on an automobile body. The 3-coating 2-baking method sequentially includes the following steps: after the object is subjected to electrodeposition coating and heating and curing, coating the intermediate coating composition → heating curing → coating the primer coating composition → preheating (preliminary Heating) → coating the clear coating composition → heating and curing. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/36B05D7/24C08G18/80C09D5/00C09D133/14C09D151/08C09D167/06C09D175/06
CPCC08G18/10C09D133/066C08G18/6216C08G18/4219C09D5/00B05D7/542C08G18/4283C08G18/8093C08G18/8064C08G18/6229C09D133/14C08G18/6254C08G18/4833C09D175/04Y10T428/31551C08L61/28B05D7/572C09D125/14C09D167/02
Inventor 石仓稔
Owner KANSAI PAINT CO LTD
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