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Aluminum lid provided with coating film composed of aqueous coating material

A technology for aluminum caps and coatings, applied in rigid containers, packaging, transportation and packaging, etc., can solve problems such as metal corrosion, and achieve the effects of improving corrosion resistance, inhibiting occurrence and expansion, and excellent corrosion resistance

Active Publication Date: 2013-06-12
TOYO SEIKAN KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] That is, when the aluminum cap on which the above-mentioned coating film is formed is applied to a positive pressure can for containing carbonated beverages, etc., the cap is deformed by the internal pressure after filling the contents, and the internal pressure changes with temperature changes when the container is stored, Causes the problem that the metal starts to corrode due to cracks in the film in the central panel radial portion (hereinafter generally referred to as the CPR portion) which has the minimum plate thickness and becomes the starting point of cover deformation

Method used

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  • Aluminum lid provided with coating film composed of aqueous coating material
  • Aluminum lid provided with coating film composed of aqueous coating material
  • Aluminum lid provided with coating film composed of aqueous coating material

Examples

Experimental program
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Effect test

preparation example Construction

[0092] [Preparation of water-based paint]

[0093] The aqueous paint used in the present invention is obtained by using the carboxyl group-containing acrylic resin in an amount of 5 to 30 parts by weight, especially 15 to 25 parts by weight, per 100 parts by weight of the base resin (solid component). That is, the base resin and the carboxyl group-containing acrylic resin are uniformly dissolved or dispersed in an organic solvent, and thereafter, the carboxyl groups in the resin are at least partially neutralized with a neutralizing agent including a basic compound to disperse them in an aqueous medium, whereby Get water-based paint.

[0094] The neutralization method may be a method of gradually adding the acrylic-modified epoxy resin to the aqueous medium under stirring, or neutralizing the acrylic-modified epoxy resin with a basic compound, and then adding the aqueous medium under stirring. A method of adding to the neutralized product or adding the neutralized product to ...

Embodiment 1

[0186] SOT caps including the aqueous paint (c-1) were prepared and evaluated in the manner described above. The composition of the water-based paint, the thickness of the coating film, the mechanical properties of the water-based paint film, and the evaluation results of the SOT cap are shown in Table 2.

[0187] The corrosion resistance of the CPR part was ◎, the corrosion resistance of the rivet part was ◎, the feathering property was ◎, the formability (contamination accumulation) was ◎, and the overall evaluation was ◎.

Embodiment 2

[0189] An aqueous paint (c-2) having a solid content of 32.5% was prepared in the same manner as the aqueous paint (c-1) except that the carboxyl group-containing acrylic resin solution (d-1) was added in an amount of 17 parts by weight. An SOT cap was fabricated in the same manner as in Example 1 except that the water-based paint (c-2) was used instead of the water-based paint (c-1).

[0190] The corrosion resistance of the CPR portion was ◯, the corrosion resistance of the rivet portion was ⊚, the feathering property was ◯, the formability (pollution accumulation) was ⊚, and the overall evaluation was ◯.

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Abstract

Disclosed is an aluminum lid which is obtained by shaping a coated aluminum base, which has a coating film composed of an aqueous coating material, so that the coating film forms the inner surface of the lid.  The important characteristic of the aluminum lid is in that the coating film has a sea-island phase-separated structure wherein dispersion phases composed of a carboxyl group-containing acrylic resin are dispersed in a continuous phase composed of a base resin.  Consequently, the aluminum lid is free from the problems of conventional aluminum lids using conventional aqueous coating materials, and thus has excellent corrosion resistance, openability and formability.

Description

technical field [0001] The present invention relates to aluminum closures applicable to can bodies such as seamless cans and three-piece cans. More specifically, the present invention relates to an aluminum cap having excellent corrosion resistance to contents having a high gas volume and contents having a high salt content and having excellent opening properties. Background technique [0002] Heretofore, coatings have been applied to can ends for positive pressure cans containing contents such as carbonated beverages, and the coatings are generally produced by dispersing a vinyl chloride resin with good processability in an organic solvent, applying the organic solvent to a metal After that, the solvent is dried to cure the resin component. However, in recent years, environmental problems have attracted attention, and from the viewpoint of reducing the generation of volatile organic compounds (hereinafter referred to as "VOC") derived from solvents, improving the working e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D8/00B65D8/04
CPCB65D17/165B65D2517/0082B65D17/4012
Inventor 高木直行原口知子
Owner TOYO SEIKAN KAISHA LTD
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