Coating composition and multilayer coating film forming method

A multi-layer coating film and composition technology, applied in chemical instruments and methods, coatings, layered products, etc., can solve the problems of insufficient appearance of multi-layer coating films, and achieve excellent concealment, improved concealment, resistance to Excellent climatic effect

Active Publication Date: 2016-05-25
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the appearance of the multilayer coating film obtained by this method may become insufficient

Method used

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  • Coating composition and multilayer coating film forming method
  • Coating composition and multilayer coating film forming method

Examples

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Embodiment

[0202] 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.

[0203] Production of hydroxyl-containing acrylic resin (I-1)

manufacture example 1

[0205] In a reaction vessel equipped with a thermometer, a thermostat, a stirring device, a reflux condenser, and a dripping device, 70.7 parts of deionized water and "Aquaroso 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 acry...

manufacture example 2

[0208] Add 130 parts of deionized water and 0.52 parts of "Aquaroso KH-10" to a reaction vessel equipped with a thermometer, a thermostat, a stirring device, a reflux condenser, and a dripping device, 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 acrylic ac...

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Abstract

The invention provides a transparent paint composition of a multilayer coating film, which is not easy to be affected by the roughness of the surface of the bottom material, the flatness and the DOI performance are excellent, when the coated object is sequentially coated by a first water coloration paint, a second water coloration paint, and a transparent coating, and then is solidified together to form the multi-layer coating film, and the multi-layer coating forming method. The paint composition comprises the acrylic resin (A) containing the hydroxyl, the melamine resin (B), and the polyhydric alcohols (C) having the special number-average molar mass in a range from 300-1500. The paint composition can be used as the transparent paint, and the coated object is sequentially coated by the first water coloration paint, the second water coloration paint, and the transparent coating, which are heated and solidified together to form the multi-layer coating.

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 a base coat paint containing a bright pigment is used to form a so-called metallic color coating film. In the case of so-called plain color coating films such as white and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D5/06B05D7/16C09D133/00C09D161/28C09D7/12B32B15/082
Inventor 大西康平
Owner KANSAI PAINT CO LTD
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