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Coating composition and method for forming multilayer coating film

A multi-layer coating film and composition technology, which is applied in coatings, devices for coating liquid on the surface, etc., can solve the problems of insufficient appearance of multi-layer coating films, and achieve excellent concealment, improved concealment, and weather resistance excellent effect

Active Publication Date: 2017-07-14
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by controlling the internal stress of the intermediate paint film, there is a case where the appearance of the multilayer paint film obtained even by realizing the prevention of interlayer interaction between the intermediate paint film and the primer film becomes insufficient. Case

Method used

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  • Coating composition and method for forming multilayer coating film

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Embodiment

[0203] Examples and comparative examples are given below to further specifically describe the present invention. However, the present invention is not limited only to these examples. It should be noted that both "parts" and "%" are obtained on a mass basis.

[0204] Production of hydroxyl-containing acrylic resin (I-1)

manufacture example 1

[0206] In a reaction vessel equipped with a thermometer, a thermostat, a stirring device, a reflux condenser, and a dripping device, add 70.7 parts of deionized water and "Aquaron KH-10" (trade name, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd., emulsifier, effective Ingredient 97%) 0.52 parts, stirred and mixed in a nitrogen flow, and heated to 80°C. Next, 1% of the total amount in the following monomer emulsion and 5 parts of 6% ammonium persulfate aqueous solution were introduced into the reaction container and held at 80° C. for 15 minutes. Then, the remaining monomer emulsion was added dropwise to the reaction vessel kept at the same temperature in 3 hours, and after the dropwise addition was completed, it was matured for 1 hour, and then 40 parts of 5% 2-(dimethylamino)ethanol aqueous solution was slowly was added to the reaction vessel while cooling to 30° C., filtered with 100-mesh nylon cloth, and discharged at the same time to obtain a hydroxyl-containing a...

manufacture example 2

[0209] In a reaction vessel equipped with a thermometer, a thermostat, a stirring device, a reflux condenser, and a dripping device, add 130 parts of deionized water and 0.52 parts of "Aquaron KH-10", stir and mix in a nitrogen stream, and raise the temperature to 80°C . Next, 1% of the total amount in the following monomer emulsion (1) and 5.3 parts of 6% ammonium persulfate aqueous solution were introduced into the reaction container and held at 80° C. for 15 minutes. Then, the remaining monomer emulsion (1) was added dropwise to the reaction container kept at the same temperature over 3 hours, and aged for 1 hour after completion of the dropwise addition. Then add the following monomer emulsion (2) dropwise over 1 hour, and after aging for 1 hour, slowly add 40 parts of 5% dimethylethanolamine aqueous solution to the reaction vessel while cooling to 30°C, and filter with 100-mesh nylon cloth , and discharged at the same time to obtain a hydroxyl group-containing particle w...

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Abstract

The present invention provides that when the first water-based coloring paint, the second water-based coloring paint and the clear paint are sequentially coated on the object to be coated, and they are cured simultaneously to form a multilayer coating film, the surface roughness that is not easily affected by the substrate can be obtained. Clear coating composition of a multilayer coating film excellent in smoothness and distinctness of image, and formation of a multilayer coating film using the clear coating composition method. To provide a coating composition containing a hydroxyl group-containing acrylic resin (A), a polyisocyanate compound (B), and a specific polyol (C) having a number-average molecular weight in the range of 300 to 1,500, and a coating composition used as a clear coating 1. A method for forming a multilayer coating film in which the first water-based colored paint, the second water-based colored paint, and the clear paint are sequentially coated on the object to be coated, and heated and cured at the same time to form a multilayer coating film.

Description

technical field [0001] The present invention relates to a coating composition and a method for forming a multilayer coating film using the coating composition. Background technique [0002] Conventionally, as a method of forming a coating film on an automobile body, a method in which electrophoretic coating is applied to the object to be coated and heated and cured, followed by intermediate paint coating → heat curing → primer coating Three-coating and two-baking method of painting → preheating (preheating) → clear paint coating → heat curing; and two-coating and two-baking method of intermediate paint coating → heat curing → topcoat coating → heat curing A method of forming a multilayer coating film. [0003] Generally speaking, the above-mentioned three-coating and two-baking method is carried out when using a base coat paint containing bright pigments to form a so-called metallic color coating film. It is carried out when forming a so-called plain color coating film suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/14C09D175/06C09D175/08B05D1/36B05D7/14C09D5/00C08G18/48C08G18/42
Inventor 北川博视大西康平
Owner KANSAI PAINT CO LTD
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