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Aqueous coating composition, can member and can

A technology of water-based coatings and compositions, applied in the direction of polyester coatings, anti-corrosion coatings, flexible coverings, etc., can solve the problems of coating film adsorption, etc., and achieve the effect of reducing adsorption and high cooking resistance

Active Publication Date: 2022-03-29
TOYO INK SC HOLD CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the emulsion-type acrylic resins disclosed in Patent Document 3 generally have the problem that the flavor and odor components in the can contents are easily absorbed by the coating film.

Method used

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  • Aqueous coating composition, can member and can
  • Aqueous coating composition, can member and can
  • Aqueous coating composition, can member and can

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0207] The present disclosure will now be described more specifically by way of examples, but the present disclosure will not be limited to these examples. In the examples, the term "part" means part by mass, and "%" means % by mass.

[0208] (Measurement conditions for number average molecular weight and weight average molecular weight)

[0209] The high-performance GPC equipment 8020 series (THF solvent, column temperature: 40° C., standard polystyrene) purchased from Tosoh Corporation was used for measurement. Specifically, four G1000 HXL, G2000HXL, G3000 HXL, and G4000HXL columns purchased from Tosoh Corporation were connected in series, and measurements were performed at a flow rate of 1.0 ml / min to determine the number average molecular weight and weight average molecular weight.

preparation example 1

[0211]

[0212] 1000 parts by mass of polyester (Mitsubishi Chemical Co., Ltd. Co., Ltd., FC-2976, acid value: 61.4mgKOH / g) and 0.36 parts by mass of N,N-dimethylbenzylamine were placed in a 3L flask, and polymerization was carried out at 150°C in a nitrogen atmosphere for 6 hours to obtain An epoxy resin (A-1) having a weight average molecular weight of 18,000 and an epoxy equivalent of 2,500 was prepared.

preparation example 2

[0214]

[0215] 1166 parts by mass of polyester ( Mitsubishi Chemical Co., Ltd., FC-2976, acid value: 61.4 mgKOH / g), and 0.23 parts by mass of N,N-dimethylbenzylamine were placed in a 3-L flask, and polymerization was carried out at 150°C in a nitrogen atmosphere 6 hours to prepare an epoxy resin (A-2) having a weight average molecular weight of 23,000 and an epoxy equivalent of 3,200.

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Abstract

An object of the present disclosure is to provide: an aqueous coating composition capable of forming a coating film to which flavor components in can contents are less likely to be adsorbed, and which has excellent retort resistance and Processability without using an epoxy resin having a propanediol skeleton or a diphenol skeleton as a raw material; and providing a can having a coating film formed from the aqueous coating composition. The aqueous coating composition comprises a composite resin (C) and water. The composite resin (C) includes an epoxy resin (A) part and a carboxyl-containing acrylate copolymer (B) part. The epoxy resin (A) forming part of the epoxy resin (A) is a reaction product having an epoxy group, and is an epoxy group in an epoxy compound having neither a propanediol skeleton nor a biphenol skeleton. The reaction product between the group and the carboxyl group of the carboxyl-containing polyester.

Description

technical field [0001] The present disclosure relates to an aqueous coating composition, a can component and a can. Background technique [0002] Metal cans are generally coated with a thin protective coating film made of synthetic resin to prevent the contents of the metal can from direct contact with metal materials, such as tinplate, tin-free steel, and aluminum, thereby preventing corrosion of the metal materials. A known aqueous coating composition for coating interior surfaces comprises a coating composition prepared by dissolving or dispersing a so-called self-emulsifiable bisphenol epoxy resin and a phenolic resin in an aqueous medium, where the self-emulsifiable bisphenol Among the phenol epoxy resins, bisphenol epoxy resins are partially bonded to acrylic resins. [0003] Here, as a coating on the inner surface of a can, a coating film is required that has flavor loss resistance, corrosion resistance, and retort resistance that does not affect the flavor of the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00B65D25/14C09D5/08C09D151/08C09D167/00
CPCC09D5/08C09D151/08C09D167/00B65D25/14C09D163/00C08L63/00C09D163/10C08L33/00B65D65/42
Inventor 佐藤翔矢户部晓文深山航
Owner TOYO INK SC HOLD CO LTD