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Water paint composition and coated articles

A technology of water-based coatings and compositions, which is applied in the direction of epoxy resin coatings, coatings, linings/internal coatings, etc., and can solve problems such as being unsuitable for coating use

Active Publication Date: 2006-08-16
TOYO INK SC HOLD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the aroma components in alcoholic beverages are more easily absorbed by the coating film than the aroma components of non-alcoholic beverages, so the coatings disclosed in the known documents are not suitable for coating the inner surface of cans containing alcoholic beverages.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0088]

[0089] (1) Epico-to4250 (manufactured by Japan Epoxy Resin Co., Ltd.) 500 parts

[0090] (2) 500 parts of ethylene glycol monobutyl ether

manufacture example 2

[0091] (1) and (2) were added in a four-necked flask, and stirred at 110°C for 5 hours to obtain an epoxy resin (a1-1) with a solid content of 50%, an epoxy equivalent of 8,000, and a weight-average molecular weight of 60,000. solution.

[0092] (1) Epico-to 1010 (manufactured by Japan Epoxy Resin Co., Ltd.) 500 parts

[0093] (2) 500 parts of ethylene glycol monobutyl ether

[0094] (1) and (2) were added in a four-necked flask, and stirred at 110°C for 3 hours to obtain an epoxy resin (a1-2) with a solid content of 50%, an epoxy equivalent of 4,000, and a weight-average molecular weight of 12,000 solution.

manufacture example 3

[0095]

[0096] (1) 150 parts of methacrylic acid

[0097] (2) 150 parts of styrene

[0098] (3) 700 parts of ethyl acrylate

[0099] (4) Benzoyl peroxide 10 parts

[0100] (5) 90 parts of ethylene glycol monobutyl ether

[0101] (6) 900 parts of ethylene glycol monobutyl ether

[0102]Put the above (6) into a four-necked flask, and add the mixed solution of (1) to (5) dropwise within 3 hours while stirring at 110° C. under nitrogen flow. After the dropwise addition, it was stirred at 110° C. for 3 hours to obtain a carboxyl group-containing acrylic resin (a2-1) solution having an acid value of 98 mgKOH / g, Tg: 8° C., and a weight average molecular weight of 74,000.

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Abstract

The aqueous coating composition comprises an acrylic-modified epoxy resin (1), a basic compound, and an aqueous medium. Here, the acrylic-modified epoxy resin (1) is obtained by reacting part of the epoxy groups of an epoxy resin (a1) with part of the carboxy groups of a carboxy group-containing acrylic resin (a2) having an acid value X[a](mgKOH / g) of 10<=X[a]<=135, a glass transition temperature Tg (DEG C) of -20<=Tg<=20, and a weight average molecular weight Mw of 10,000<=Mw<=200,000 and a carboxy group-containing acrylic resin (a3) having an acid value X[B](mgKOH / g) of 180<=X[B]<=450. The aqueous coating composition excels in water resistance, has sufficient processability, and slip properties at the same time when used as a can coating, particularly a lid coating, and can form a coating film having both flavor properties and adhesion when used as an inner surface coating for a bottomed cylindrical member.

Description

technical field [0001] The present invention relates to an aqueous coating composition and a substrate coated with the aqueous coating composition. More specifically, the present invention relates to an aqueous coating composition suitable for coating substrates such as metals. Background technique [0002] A coating composition containing an aromatic epoxy resin as a main component is excellent in processability, resistance to contents and coating film performance, and can be used as a coating for metals, especially for containers. These aromatic epoxy resins themselves do not dissolve or disperse in aqueous solvents. [0003] On the other hand, from the viewpoints of resource saving, energy saving or environmental preservation, water-based primers and coatings for metals have been studied, and primers and coatings containing aromatic epoxy resins as the main component are also proposed to be water-based. various schemes. Known is a method in which, for example, an aroma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/10C09D5/02B05D7/14B65D25/14B32B15/08B32B15/092C08L63/00C09D5/00C09D133/02C09D133/08C09D163/00
CPCB32B27/38B65D25/14C09D5/00C09D133/062C09D163/00
Inventor 冈本淳二山口薰原口幸也
Owner TOYO INK SC HOLD CO LTD
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