Water coating composition

A technology of water-based coatings and compositions, which is applied in the direction of epoxy resin coatings, coatings, and devices for coating liquids on the surface, etc., which can solve problems such as bending processability, water whitening resistance, acid resistance, adhesion, odor, etc. No problem, excellent smell, improved bending processability, excellent corrosion resistance of contents

Inactive Publication Date: 2007-10-17
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coating films obtained by applying the coating materials described in Patent Documents 1 to 6 cannot satisfy

Method used

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  • Water coating composition

Examples

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manufacture example 1

[0151] Production Example 1: Production of Epoxy Resin Solution (a1)

[0152] Add 558 parts of Epikote 828EL (Note 3), 329 parts of bisphenol A, and 0.6 part of tetrabutylammonium bromide into a four-necked flask equipped with a reflux tube, a thermometer, and a stirrer, and react at 160°C under a nitrogen stream. The reaction was followed by an epoxy equivalent, and the reaction was carried out for about 5 hours to obtain a bisphenol A epoxy resin having a number average molecular weight of about 11,000 and an epoxy equivalent of about 8,000.

[0153] (Note 3) Epikote 828EL: manufactured by Japan Epoxy Resins Co., Ltd., bisphenol A type epoxy resin, epoxy equivalent about 190, molecular weight about 350

manufacture example 2

[0154] Production Example 2: Production of carboxyl group-containing acrylic resin solution (a2)

[0155] Add 882 parts of n-butanol to a four-necked flask equipped with a reflux tube, a thermometer, a dropping funnel, and a stirrer, and mix 180 parts of methacrylic acid, 240 parts of styrene, 180 parts of ethyl acrylate, and 18 parts of 2-ethyl peroxide. The mixture of tert-butyl hexanoate was heated to 100°C under a stream of nitrogen gas and added dropwise from the dropping funnel in about 3 hours, then continued to stir at the same temperature for 2 hours after the dropwise addition, and then cooled to obtain a solid component of 40% acrylic resin solution. The resin acid value of the obtained resin (solid content) was 196 mgKOH / g, and the number average molecular weight was about 19000.

manufacture example 3

[0156] Production Example 3: Production of Acrylic Modified Epoxy Resin Dispersion (A)

[0157] Add 80 parts of bisphenol A type epoxy resins (solid content) obtained in manufacture example 1, 40% acrylic resin solution ( 20 parts of solid content), 33 parts of diethylene glycol monobutyl ether, heated to 100°C to dissolve, then added 2 parts of N,N-dimethylaminoethanol, reacted for about 2 hours, then added 3 parts of N, The N-dimethylaminoethanol reaction was continued for 20 minutes. Then, 165 parts of deionized water was dripped over 1 hour for water dispersion to obtain an acrylic modified epoxy resin dispersion having an acid value of 34 mgKOH / g and a solid content of 30%.

[0158] [Manufacture of resole phenolic resin (B)]

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Abstract

The invention provides a coating composition for pots capable of forming a coating with good bending machinability, water resistance prewhitening property and good smell. A water coating composition is characterized by containing 0.1-20 phr resol (B) and 0.1-20 phr acrylic resin (C) with acid number 100-500mgKOH/g relative to 100 phr acrylic resin modified epoxy resin (A). The resin (A) and the resin (C) are dispersed in the water medium. The acrylic resin (C) has the following necessary components: ethylene copolymer chain (1) taking acid radical polymerized monomer as monomer component and ethylene copolymer chain (2) taking carboxyl radical polymerized monomer as monomer component.

Description

technical field [0001] The present invention relates to a coating composition for cans, which is useful for coating constituent parts of metal cans such as beverage and fruit cans and lids, and the obtained coating film has bending processability, water whitening resistance, and acid resistance. A coating film with an excellent balance of adhesion and odor. Background technique [0002] Conventionally, as can coating compositions, coating compositions for cans, such as inner and outer surfaces of cans, can ends, etc., having coating film properties such as processability, adhesiveness, and corrosion resistance have been developed. [0003] Conventionally, an invention is known, which relates to an aqueous resin dispersion in which an acrylic resin (D) is added to an acrylic modified epoxy resin, wherein the acrylic resin (D) contains a monobasic acid as an essential component Furthermore, it contains 40% or more of an acrylic monomer component whose glass transition point o...

Claims

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Application Information

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IPC IPC(8): C09D163/10C09D5/02B05D7/22C09D161/06C09D133/00
CPCC08L33/04C09D5/00C09D133/14C09D161/04C09D163/10
Inventor 松田英树杂贺政昭稻田祐一堀家直树野田纯生增田秀树清水庆一原川浩美
Owner KANSAI PAINT CO LTD
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