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Water-based coating composition and process for formation of coating film

A technology of water-based coatings and compositions, applied in the direction of anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve problems such as difficult to carry out and difficult to form coating films

Active Publication Date: 2012-11-07
NIPPON PAINT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when using the curing reaction of epoxy resin and polyamine compound, the curing reaction is difficult to proceed at low temperature (for example, below 5°C), so it is difficult to form a coating film that exhibits practical performance at low temperature.

Method used

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  • Water-based coating composition and process for formation of coating film
  • Water-based coating composition and process for formation of coating film
  • Water-based coating composition and process for formation of coating film

Examples

Experimental program
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Effect test

manufacture example 1

[0096] [Manufacturing example 1] Preparation of water-based epoxy polyamine resin (A) Ⅰ

[0097] Add 702 parts of raw material resin, 269 parts of bisphenol A, 108 Parts of dimer acid, 190 parts of methyl isobutyl ketone (hereinafter referred to as "MIBK"), in the presence of 1 part of benzyldimethylamine, reacted at 117°C until the epoxy equivalent reached 1079g / equivalent, Thus an epoxy resin is obtained. Then, 255 parts of ketimine compounds (73 mass % MIBK solution) of aminoethylethanolamine were added, and it was made to react at 117 degreeC for 1 hour. Then, it diluted with MIBK to 75% of non-volatile content, and obtained the epoxy-type polyamine resin whose amino group equivalent weight is 1184.

[0098] Here, acetic acid was added so that the neutralization rate would be 35.0% (neutralization rate with respect to the amino groups of the resin), and ion-exchanged water was added for dilution. Then, the mixture of MIBK and water was removed under reduced pressure so ...

manufacture example 2

[0099] [Production Example 2] Production of Waterborne Epoxy Polyamine Resin (A) II

[0100] Add 742 parts of raw material resin, 336 parts of bisphenol A, 190 One part of MIBK was reacted at 117° C. in the presence of one part of benzyldimethylamine until the epoxy equivalent reached 1079 g / equivalent, thereby obtaining an epoxy resin. Then, 350 parts of ketimine compounds (73 mass % MIBK solution) of diethylenetriamine were added, and it was made to react at 117 degreeC for 1 hour. Then, 27 parts of ion-exchanged water and 188 parts of glycidyl neodecanoate (manufactured by Hexion Specialty Chemicals, trade name "Cardura E10-P") were added, and reacted at 100°C for 2 Hour. Then, it diluted with MIBK to 75% of non-volatile content, and obtained the epoxy-type polyamine resin whose amino group equivalent weight is 1093.

[0101] Here, acetic acid was added so that the neutralization rate would be 35.0% (neutralization rate with respect to the amino groups of the resin), and...

manufacture example 3

[0102] [Production example 3] Production of water-based epoxy polyamine resin (A) III

[0103] Add 525 parts of raw material resin, 205 parts of bisphenol A, 110 parts of epoxy equivalent obtained by synthesizing bisphenol A and epichlorohydrin in the reaction tank equipped with agitator, cooler, nitrogen introduction pipe and thermometer. One part of MIBK was reacted at 117° C. in the presence of one part of benzyldimethylamine until the epoxy equivalent reached 730 g / equivalent, thereby obtaining an epoxy resin. Then, 350 parts of ketimine compounds (73 mass % MIBK solution) of diethylenetriamine were added, and it was made to react at 117 degreeC for 1 hour. Then, 27 parts of ion-exchanged water and 188 parts of glycidyl neodecanoate (manufactured by Hexion Specialty Chemicals, trade name "Cardura E10-P") were added and reacted at 100° C. for 2 hours. Then, it diluted with MIBK to 75% of non-volatile content, and obtained the epoxy-type polyamine resin whose amino group eq...

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Abstract

Provided is a water-based coating composition which exhibits excellent low-temperature curability and which can form a coating film with excellent adhesion to a substrate. A water-based coating composition which comprises (A) an aqueous epoxy-derived polyamine resin that has one or more primary and / or secondary amino groups in the molecule, (B) a compound that has one or more (meth)acryloyl groups in the molecule, and (C) an alkoxysilane compound, wherein the equivalent ratio of (meth)acryloyl of the compound (B) to amino of the resin (A) [(meth)acryloyl / amino] is 0.7 to 2.5, and the content of the alkoxysilane compound (C) is 0.2 to 5% by mass relative to the solid matter of the water-based coating composition.

Description

technical field [0001] The present invention relates to a water-based coating composition and a method for forming a coating film. Background technique [0002] Generally, solvent-based paints containing epoxy resins and polyamine compounds are used as anticorrosion paints. However, in recent years, from the viewpoint of environmental protection, there has been a social demand to switch from solvent-based paints to water-based paints. Such water-based paints include, for example, water-soluble polyamine resins mixed with various pigments and additives as the main ingredient, epoxy resin emulsions, and glycidyl and alkoxysilyl-containing paints. A water-based coating of an acrylic silicone resin emulsion (Patent Document 1). [0003] However, when the curing reaction between the epoxy resin and the polyamine compound is utilized, the curing reaction is difficult to proceed at low temperatures (for example, 5° C. or lower), and thus it is difficult to form a coating film exh...

Claims

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Application Information

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IPC IPC(8): C09D163/00B05D7/24C09D4/02C09D5/00C09D5/02C09D5/08C09D7/12C09D183/06
CPCC08G59/184C09D5/022C08L83/04C08G77/04C08G77/26
Inventor 庄克彦今村宗夫云林院崇宏畑中照久
Owner NIPPON PAINT CO LTD
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