JPH052415Y2 - - Google Patents

Description

[Detailed explanation of the idea]

INDUSTRIAL APPLICATION FIELD This invention relates to a heat-resistant aluminum container for food and drink that is used while being exposed to high temperatures, such as an aluminum pan without a pot. In this specification, the term aluminum is used to include aluminum alloys. BACKGROUND TECHNOLOGY Conventionally, as the above-mentioned aluminum container for drinking and drinking roots, a container in which an aluminum base material is molded into a dish shape or a cup shape, with the aluminum surface exposed, has been used. Problems that the invention aims to solve However, such containers cannot be used for storing food, etc.
During storage, there was a drawback that the container was easily corroded by moisture, salt, acid, etc. contained in the container contents.
Furthermore, when containers stored in a stack are taken out one by one, the aluminum surface has poor slipperiness, so the containers tend to stick together and move, making it difficult to take them out. Alternatively, when forming containers, lubricating oil must be applied to the surface of the aluminum base material to improve formability, making the forming process troublesome, and furthermore, the lubricating oil must be removed after forming for food hygiene reasons. However, there were also drawbacks such as the fact that the work was increasingly troublesome. However, containers with vinyl coating on the inner surface are also available to prevent corrosion caused by the contents of the container, but in this case, they cannot be heated in a microwave, oven, open flame, etc. while the contents are still inside. When this is done, the resin decomposes due to heat, causing problems such as discoloration and blackening of the resin, and even smoke generation. This invention was made in view of this technical background, and aims to prevent corrosion caused by the contents of containers, improve the ease of removing stacked containers by improving slipperiness, and, moreover, use lubricating oil during molding. In addition to being unnecessary, discoloration during heating,
The purpose of the present invention is to provide a heat-resistant aluminum container for food and beverages that prevents smoke generation and has excellent heat resistance. Means for Solving the Problems This invention, as shown in FIGS. 1 and 2, includes a coupling film 3 made of an organometallic compound on at least the inner surface of a container body 2 made of an aluminum base material 1. Metal adhesion amount 0.5~100mg/ ^m2
The gist of the present invention is a heat-resistant aluminum container 4 for food and drink, which is characterized by being coated in a state defined by the following. The aluminum base material 1 constituting the container body 2 is
The composition is not particularly limited as long as it has the strength, moldability, and other properties required as a container for food and drink. The coupling film 3 is prepared by dissolving a coupling agent, which is an organometallic compound, in an organic solvent or water.
Alternatively, it is formed by applying a processing solution in the form of an emulsion and drying it. Preferred examples of the coupling film include a silane coupling film using a silane coupling agent and a titanium coupling film using a titanium coupling agent. To explain these, the silane coupling agent treatment solution is formed by diluting the silane coupling agent with water or alcohol as a solvent. Here, the general chemical structure of the silin coupling agent is
YRSiX ₃ (However, X represents a hydrolyzable group bonded to a silicon atom, such as chlorine, alkoxy group, acetoxy group, etc., Y represents an organic reactive group bonded to an organic polymer, vinyl, (methacrylic, amino, mercapto, etc.) can be used. Specifically, γ-mercaptopropyltrimethoxylane, γ-aminopropyltriethoxysilane, N
-β(aminoethyl)γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltris(β-methoxyethoxy)silane, γ-
Examples include mercaptosilanes including methacryloxypropyltrimethoxysilane, aminosilanes, epoxysilanes, vinylsilanes, methacrylsilanes, and the like. On the other hand, a titanium coupling agent treatment solution is formed by diluting the titanium coupling agent with a petroleum hydrocarbon, aromatic hydrocarbon, or other solvent with a melting point as low as possible. Examples of the titanium coupling agent include tetraisopropyl titanate, tetraisopropyl titanate polymer, tetrabutyl titanate, tetrabutyl titanate polymer, tetrastearyl titanate, 2-ethylhexyl titanate, tetraisopropyl titanate (4 parts) + tetrastearyl titanate (1 part). ), dibutyl titanate polymer, isopropoxy titanium stibrate, titanium acetylacetonate, titanium lactate, and the like. Any method such as a spray method, a dipping method, a roll coating method, a brush coating method, etc. can be adopted as a method for applying the treatment solution such as the above-mentioned silane coupling agent or titanium coupling agent to the surface of the aluminum base 1.
Further, it is desirable that drying after application be carried out at a temperature of about 15 to 300°C. The drying time varies depending on the drying temperature, and is preferably carried out at 200°C for about 10 seconds, for example. Moreover, the coupling film 3 contains Si,
The condition is that the metal such as Ti be coated in an amount of 0.5 to 100 mg/m ² . If the amount of the metal deposited is less than 0.5 mg/m ² , effects such as improvement in corrosion resistance are poor. On the other hand, if the amount exceeds 100 mg/m ² , the effect will not be particularly increased, but rather the disadvantage of increased costs due to waste of materials will result. The amount of deposited metals such as Si and Ti may be set by adjusting the dilution ratio of the coupling agent during the production stage of the processing solution, or by adjusting the amount of the processing solution applied to the aluminum base. It's good to wear. Of course, the above-mentioned coupling film 3 may be formed by forming the aluminum base material 1 into the container body 2 and then applying a treatment liquid to the inner surface of the container body 2 and drying it. It is better to form a container by forming a material that has been coated with a coupling film in advance so that the coupling film surface faces the inner surface of the container. This will also allow for the improvement in formability due to the coupling film surface, and will also provide lubrication during molding. This is preferable because oil is not required. The container of the illustrated embodiment was also manufactured in this manner. Although the illustrated embodiment shows a container in which the coupling film 3 is formed only on the inner surface of the container body 2, the coupling film may be formed on the inner and outer surfaces of the container body 2 if necessary. Effects of the invention As described above, the heat-resistant aluminum container for food and beverages according to the invention has a coupling film made of an organometallic compound on at least the inner surface of the container body made of an aluminum base material, which reduces the amount of metal adhesion by 0.5 to 100.
The coating is formed in a state specified by mg/m ² . Therefore, due to the presence of the coupling film, it is possible to achieve excellent heat resistance, as will be clear from the consideration of the examples described later, and even when the container is heated, the film will not discolor or emit smoke. There is no possibility that this will occur. Moreover, it can be made to have excellent corrosion resistance, and even when foods and the like are stored for a long period of time, corrosion of the container by the contents of the container can be prevented.
Furthermore, it has excellent slip properties, and even when containers are stored in a stacked state, each container can be separated and taken out reliably and easily, making it extremely convenient to handle. . Furthermore, by using an aluminum material with a coupling film pre-coated on the surface of the aluminum base material and molding this into a container, it is possible to improve moldability and eliminate the need for lubricating oil during molding. This also has the effect of improving molding workability. Example Next, an example of this invention will be shown in comparison with a comparative example. [Example 1] γ-, an aminosilane, was applied to the surface of a 0.15 mm thick aluminum base made of JIS1200 alloy.
_{Aminopropyltriethoxysilane ( H2NC3H6}
Using a 1% aqueous solution (PH approximately 11) of Si(OC ₂ H ₅ ) ₃ ),
165 After applying gravure mesh roll coat,
Test materials were produced by drying at 200°C for 10 seconds. The amount of Si deposited at this time was 15 mg/m ² . [Example 2] Tetraalkyl titanate was dissolved in n-hexane on the surface of the same aluminum base material as above.
After applying a gravure mesh roll coat of 165% using a solution of 165%, a test material was prepared by drying at 200×10 seconds. The amount of Ti deposited at this time was 17 mg/m ² . [Comparative Example 1] A test material (without film treatment) consisting of a rolled aluminum base material having the same composition and the same shape as above was obtained. [Comparative Example 2] Vinyl chloride-vinyl acetate paint was applied to the same aluminum base material surface as above, and then heated at 150℃ x 5
Drying was performed for seconds to produce a test material coated with a resin film with a film amount of 2 g/m ² . The following tests were conducted on the four types of test materials obtained above. [Corrosion Resistance Test] The four types of test materials were subjected to salt water spraying in accordance with JIS Z2371 for 150 hours, and the state of surface corrosion was investigated. The results are: ○: No corrosion was observed, △: Slight corrosion was observed.
×: Shown in Table 1 as severe corrosion. In addition, each sample material was immersed in hot water of 95℃ or higher for 30 minutes.
The state of discoloration of the surface was examined when immersed for a minute. The results are ○: No discoloration was observed, △:
Table 1 shows those in which slight discoloration was observed, and ×: severe discoloration. [Moldability Test] Each material was press-molded into a container with a diameter of 12 cm and a depth of 3.5 mm, and the roughness of the aluminum on the inner peripheral surface of the molded product was examined. The results are shown in Table 1 as ○: No rough skin was observed, ×: rough skin was observed. [Slip property test] The slip property of the surface of each material was examined using an adhesion/slip tester. The results are ○: Good slipperiness;
×: Shown in Table 1 as having poor slip properties. [Heating Test] Each material was directly heated with a gas burner to examine the state of discoloration on the surface of the material. As a result, ○: No discoloration was observed, ×: Discoloration from brown to black.
are shown in Table 1. At the same time, the presence or absence of smoke was also examined. The results are shown in Table 1 as ○: No smoke generation was observed, ×: Smoke generation was observed.

[Table] As is clear from the above results, the container according to this invention has excellent corrosion resistance and slip properties, and has excellent corrosion resistance without the risk of discoloration of the film or smoke generation even when heated. I was able to confirm it. It is also found that when a material in which a coupling film is previously formed on an aluminum base material is molded into a container, it has excellent moldability.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a heat-resistant aluminum container for food and beverages according to this invention, and FIG. 2 is a perspective view of the appearance of the container. 1... Aluminum base material, 2... Container body, 3
...Cupling film, 4...Container.

Claims (1)

[Claims for Utility Model Registration] (1) At least the inner surface of the container body made of an aluminum base material is coated with a coupling film made of an organometallic compound with a metal adhesion amount of 0.5 to 100 mg/ ^m2. A heat-resistant aluminum container for food and drink. (2) The heat-resistant aluminum container for food and beverages according to claim 1, wherein the coupling film is a silane coupling film. (3) The heat-resistant aluminum container for food and beverages according to claim 1, wherein the coupling film is a titanium coupling film.