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Aqueous coating composition

A technology for water-based coatings and compositions, applied in anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve the problems of difficulty in exerting coating properties and poor curing properties, and achieve excellent low-temperature curing properties and excellent coating properties.

Active Publication Date: 2011-08-24
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since curability is poor at low temperatures (for example, around 5°C), there is a problem that it is difficult to exhibit sufficient coating film performance when used in low temperature places (for example, outdoors in winter).

Method used

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  • Aqueous coating composition
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Examples

Experimental program
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Effect test

Embodiment

[0066] Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to these examples. In addition, parts and % in Examples are based on weight unless otherwise specified. In addition, the evaluation items in the examples are as follows.

[0067] (coating state)

[0068] The glass plates obtained by applying and drying the coatings obtained in Examples and Comparative Examples at 25°C (24 hours) were visually inspected to evaluate coating film abnormalities such as gloss, transparency, particles, craters, and edge shrinkage. .

[0069] Gloss ○: Coated film with high gloss

[0070] △: Semi-gloss coating film

[0071] ×: Dull coating film

[0072] Transparency ○: Completely or almost no cloudy coating film

[0073] △: Slightly cloudy coating film

[0074] ×: Coated film with severe turbidity

[0075] Abnormal coating film ○: Coating film completely or almost free of particles, shrinkage cavity / edge shrinkage...

manufacture example 1

[0087] [Manufacturing example 1] Production of polyamine resin (epoxy polyamine resin)

[0088] Add 702 parts of epoxy resins, 269 parts of bisphenol A, 108 parts of dimer acid, 190 parts of methyl isobutyl ketone (hereinafter referred to as "MIBK") was reacted at 117° C. until the epoxy equivalent became 1,270 in the presence of 1 part of benzyldimethylamine. 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. Thereafter, it was diluted with MIBK until the non-volatile content was 75%, and an epoxy-based polyamine resin having a number average molecular weight of 2400 and an amine equivalent of 1184 was obtained.

manufacture example 2

[0089] [Manufacturing example 2] Emulsification of epoxy-based polyamine resin

[0090] Acetic acid was added to the epoxy polyamine resin obtained in Production Example 1 so that the neutralization rate was 20.0% (neutralization rate with respect to the amine groups of the resin), and ion-exchanged water was added for dilution. Thereafter, the mixture of MIBK and water was removed under reduced pressure until the solid content was 40% by mass to prepare emulsion I.

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Abstract

An aqueous coating composition having excellent low-temperature curability. The aqueous coating composition contains a water-soluble or water-dispersed polyamine resin (A) having one or more first amine groups and / or second amine groups in each molecule, and a compound (B) having one or more (meth)acryloyl groups in each molecule. The polyamide resin (A) has an amine equivalent weight of 100-3000, and the compound (B) has a viscosity at 25 DEG C of not more than 3000 mPas.

Description

technical field [0001] The invention relates to a water-based paint composition. Background technique [0002] 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. As such an aqueous coating material, the two-component type aqueous coating composition containing an epoxy resin and a polyamine compound is mentioned, for example (patent document 1). Such an aqueous coating composition exhibits sufficient curability at a temperature higher than normal temperature, and can form a normal coating film. However, since curability is poor at low temperatures (for example, around 5° C.), there is a problem that it is difficult to exhibit sufficient coating film performance when used in low temperature places (for example, outdoors in winter). [0003] Existing patent documents [0004] patent documents [0005] Patent Document 1: Japanese Patent Application Laid-Open No. 11-166153...

Claims

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Application Information

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IPC IPC(8): C09D201/02C09D5/02C09D133/14C09D163/00
CPCC08G59/184C09D133/14C08F212/08C08F220/18C08F2220/325C09D179/02C08F8/30C09D5/08C09D163/00C08F8/44C09D5/02C08F220/1804C08F220/325C09D201/02
Inventor 庄克彦今村宗夫云林院崇宏
Owner NIPPON PAINT CO LTD
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