JPH01214433A - Aerosol container and aerosol product - Google Patents

Abstract

PURPOSE:To provide a vessel in which neither corrosion nor pitting occurs even if containing a water-based aerosol, by preparing an epoxy-phenol resin protective covering layer as a ground-coating layer covering directly the inner wall of a can and preparing a specified vinyl-organosol protective covering layer as a finish-coating layer coating the first layer. CONSTITUTION:A first resin protective covering layer of 1-8mum in thickness comprising epoxy-phenol resin paint is provided as the ground-coating layer covering directly the inner wall of a can, and a second resin protective covering layer of 3-20mum in dried film thickness comprising vinyl-organosol paint having a glass transition temperature of and higher than 50 deg.C is provided as the finish- coating layer covering the first layer. The epoxy-phenol resin paint is used with the weight ratio of epoxy resin to resole type phenol resin being 70:30 to 95:5. The vinyl-organosol paint forming the second resin protective covering layer is preferably made of vinyl chloride resin mainly, and the combination of vinyl chloride copolymer resin, epoxy resin phenol resin, etc.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a steel aerosol container filled with a water-based aerosol content containing water, and an aerosol product obtained by filling the container with the content. Regarding.

(Prior Art) Conventionally, aerosol products have mainly used solvent-based aerosol contents containing a solvent such as alcohol. The steel containers used for filling the contents are mainly coated with two layers of either epoxy/phenol resin paint or epoxy/area resin paint on the inner surface. In recent years, products using foamy aerosol contents, such as hair mousse aerosol products, have been actively put into practical use. Most of the contents of the foam aerosol are water-based with weak acidity and a moisture content of 20% or more, and the contents of the foam aerosol are mixed with the inner surface of conventional solvent-based products. When used on painted steel containers, the corrosion resistance of the inner surface coating was insufficient and corrosion and pitting occurred.

For this reason, if the thickness of the inner surface coating is increased to increase corrosion resistance, baking may sometimes result in foaming of the coating, resulting in coating defects, as well as reduced workability, resulting in the need for neck-in processing of the container body. When the lid was seamed, cranks were generated in the deformed parts, and corrosion occurred in those parts.

Therefore, when using the foamed aerosol contents, aluminum containers are used which have excellent corrosion resistance, but there is a problem that the aluminum containers are much more expensive than steel containers.

(Problems to be Solved by the Present Invention) The present invention eliminates such conventional disadvantages, has excellent workability and corrosion resistance, and does not cause corrosion or pitting even when filled and stored with the aerosol contents of Water Heath. The purpose is to provide a steel aerosol container.

Further, the steel aerosol container has a water content of 2.
It is an object of the present invention to provide an aerosol product obtained by filling an aerosol content of waterhose of 0% or more.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a steel aerosol which is provided with a two-layer resin protective coating layer on at least the inner surface of the can body and filled with the aerosol contents of Waterhose. In the container, the first layer directly covers the inner surface of the can body.
A first resin protective coating layer with a dry film thickness of 1 to 8 μm is provided on the layer using an epoxy/phenol resin paint, and a second layer overcoated on the first layer is made of vinyl having a glass transition temperature of 50'C or higher.・Dry film thickness 3-20 with Olkali sol paint
A second resin protective coating layer of μ is provided.

Further, the aerosol product of the present invention is characterized in that it is obtained by filling the steel aerosol container with an aerosol content having a moisture content of 20% or more.

The epoxy/phenol resin paint forming the first resin protective coating layer is a combination of an epoxy resin and a resol type phenol resin in a weight ratio of 70:30 to 95:5. Epoxy resin is obtained by polymerizing bisphenol A and epichlorohydrin, and phenolic resins include p-cresol, 0-cresol, m-cresol,
xylenol, alkylphenol, bisphenol A
A resol type phenol resin obtained by reacting one or more monovalent or divalent phenols with formaldehyde by a known method and, if necessary, converting the mixture into an alkyl ether, is used.

The dry film thickness of the epoxy/phenol resin paint is 1~
A range of 8μ is desirable, and a range of 3 to 6μ is particularly preferred.

If the coating thickness is less than 1 μm, the steel material will not be covered completely and corrosion will occur, and if it is more than 8 μm, the film thickness will become large and workability will decrease, so processing is required after painting, such as in three-piece cans. In this case, cranks occur in the coating film during processing.

The vinyl organosol resin paint that forms the second resin protective coating layer is preferably made of vinyl chloride resin, with a combination of vinyl chloride copolymer resin, epoxy resin, phenol resin, etc., and the glass transition temperature of the resulting coating film. is 50℃
Use the above. A lubricant such as microcrystalline wax or vegetable wax, or a pigment such as titanium oxide or zinc oxide may be appropriately blended into this vinyl organosol resin paint by a known method.

The dry film thickness of the vinyl organosol resin paint is
For the same reason as the coating material forming the layer, a range of 3 to 20 microns is desirable, and a range of 6 to 17 microns is particularly preferred. Further, the glass transition temperature of the obtained coating film is desirably 50°C or higher; if it is lower than 50°C, the water resistance is poor and the coating film becomes whitened or blistered, resulting in a significant decrease in corrosion resistance.

The steel material used for the can body may be a plated steel plate such as a tin plated steel plate, a thin tin plated steel plate, a chrome plated steel plate, or a chemical conversion treated steel plate such as tin-free steel.

Next, as a method for manufacturing a can body provided with a resin protective coating layer as described above, for example, a first layer is formed on the inner surface of the can body of the thin steel plate except for the can body joint part. Roller coat with phenolic resin paint. The thin plate is baked at a temperature of 180 to 230° C. for 1 to 15 minutes to form a coating film with a dry coating thickness of 1 to 8 μm on the thin plate.

A vinyl organosol resin paint that forms the second layer is roller-coated on top of this and baked under the same conditions as the first layer, resulting in a dry film thickness of 3 to 20μ and a glass transition temperature of 5.
A second resin protective coating layer is formed at a temperature of 0° C. or higher. The thin plate on which both the first and second resin protective coating layers are formed is cut into a blank size, which is formed into a cylindrical shape and welded to form a can body. Next, the unpainted portions of the inner and outer surfaces of the can body joint are repair-painted using a known paint.

Another method is to form the first resin protective coating layer by the method described above, and then form the can body in the same manner as described above. Next, after repainting the unpainted part of the can body joint, the second coating is applied to the inner surface of the can body.
The layer-forming vinyl organosol resin paint is spray coated and baked under the same conditions as above to form a second resin protective coating layer.

In addition, a can body is formed from the steel material by neck-in processing or drawing and ironing, and the paint forming the first and second layers is sequentially spray-coated on the inner surface of the can body, and baked in the same manner as above. Then, both the first and second resin protective coating layers are formed.

(Example) The present invention relates to an aerosol container and an aerosol product provided with a coating film having excellent corrosion resistance, and examples of the present invention are shown below.

Example 1 Three-piece container, plate thickness 0.19 mm, length 7
26+nm, width 876mm tin plate for multiple can bodies (soot weight is 5.6g/rrr on the inner side, 2 on the outer side)
, 8g/rff) was applied to the inner surface of the can body, excluding the can body seam, using a first layer paint with a weight ratio (hereinafter expressed as E:P) of epoxy resin and resol type phenolic resin of 80:20. Apply epoxy/phenol resin paint using a roller coat, bake at a temperature of 205°C for 10 minutes, and apply the
Form a resin protective coating layer. Furthermore, a vinyl organosol resin with a glass transition temperature of 73°C was applied as a second layer coating on top of this using a roll coat, and the paint was coated with a vinyl organosol resin having a glass transition temperature of 73°C.
Bake for 0 minutes to form a second resin protective coating layer of about 12μ. After this, printing and external painting are applied to the outer surface of the can body. In addition, in the same manner as the can body, the bottom cover, lid, mounting cup (soot weight was 11.2 g/bottom on the inner surface and 8.4 g/bottom on the outer surface), etc. were also coated.

Next, the tin plate, whose inner and outer surfaces have been painted, is cut into a predetermined blank size, each of which is formed into a cylindrical shape, and the joint portion of the can body is welded to form a can body. The welded portion is coated on the inner and outer surfaces of the can body with a known suitable paint. And after painting,
A 220g container with flanges applied to the top and bottom of the can body, the bottom cover and lid wrapped around it, and a mounting cup attached to the lid.
A three-piece steel aerosol container was created.

Example 2 A three-piece steel aerosol container was prepared in the same manner as in Example 1 except that a thin tin-plated steel plate for welded cans with a thickness of 0.19++ m was used as the steel material.

Example 3 Using epoxy/phenol resin paint as the first layer,
A three-piece steel aerosol container was prepared in the same manner as in Example 1 except that the dry coating thickness was approximately 6 μm.

Example 4 A three-piece steel aerosol container was prepared in the same manner as in Example 1 except that a vinyl organosol resin paint having a glass transition temperature of 77° C. was used as the second layer.

Table 1 shows the results of evaluating the workability and corrosion resistance of the three-piece steel aerosol containers (Examples 1 to 4) and Comparative Examples 1 to 4 having different conditions.

Here, in Comparative Example 1, only a resin protective coating layer with a dry coating thickness of 8μ was formed using an epoxy/phenol resin paint with an E:P=50:50 ratio, and the inner surface of the can body joint was coated with a known paint. did. In Comparative Example 2, the glass transition temperature of the vinyl organosol resin paint forming the second layer of Example 1 was 40%.
℃ and other conditions were the same as in Example 1. Comparative example 3
In this case, both the first layer and the second layer were made of epoxy area resin paint to form two resin protective coating layers each having a dry coating thickness of 4 μm. Comparative example 4 has the first layer and the second layer E:P=80
Two resin protective coating layers each having a dry coating thickness of 4 μm were formed using No. 10 epoxy/phenol resin paint.

In Table 1, the workability was evaluated by cutting each coated piece as described above into a size of 70 mm x 70 mm, and bending the coated surface to be evaluated, that is, the inner surface of the can body, facing outward. A spacer is inserted inside this, and it is attached to an impact testing machine, and a load of 3 kg is dropped from a height of 40 cm to perform impact bending.

Next, the processed area was immersed in a sulfuric acid solution and the state of cracking in the coating film was observed and evaluated. Corrosion resistance evaluation was performed by filling containers coated with the above coatings with 80% ethanol aqueous solution (water content 20%), hair mousse (water content 70%), and carbonated water, and then applying a propellant. Fill and seal with mounting cup. This was stored at a temperature of 45° C., and after 3 months, the state of corrosion on the inner surface of the can body was observed and evaluated.

The workability was evaluated as Ol when it was good, Δ when it was slightly bad, and × when it was bad.

In addition, the corrosion resistance was evaluated as ◯ when there was no corrosion and good, △ when spot corrosion was observed in the processed parts, and × when there was a lot of spot corrosion.

In all of Comparative Examples 1 to 4, slightly poor or defective parts were observed in corrosion resistance, but in Examples 1 to 4, all were in good condition and excellent in workability and corrosion resistance.

(Effects) As is clear from the above description, the first layer of the present invention is coated with an epoxy/phenol resin paint on the inner surface of the can body of the ζ container.
8μ, the second layer is vinyl with a glass transition temperature of 50℃ or higher.
By applying 3 to 20μ of organosol resin paint to form a resin protective coating layer, it has excellent processability and corrosion resistance, and has a high coating protection effect.It also prevents corrosion and pores even when filled with water-based aerosol contents and stored for a long period of time. A steel aerosol container that does not generate food can be provided.

Further, the steel aerosol container has a water content of 2.
It is possible to provide an aerosol product that is filled with a water-based aerosol content of 0% or more and can be stored for a long period without any problems.

Patent applicant: Hokkai Seikan Co., Ltd. Representative Tatsuhiko Sahara

Claims (1)

[Claims] 1. In a steel aerosol container in which a water-based aerosol content is filled by providing at least a two-layer resin protective coating layer on the inner surface of the can body, the first layer that directly covers the inner surface of the can body contains an epoxy phenol resin. A first resin protective coating layer with a dry film thickness of 1 to 8 μm is provided using a paint based on the resin, and a second layer overcoated on the first layer is a dry film made of a vinyl organosol paint with a glass transition temperature of 50° C. or higher. Steel aerosol container 2, characterized in that it is provided with a second resin protective coating layer having a thickness of 3 to 20 μm, Claim 1
An aerosol product obtained by filling the steel aerosol container described above with an aerosol content having a moisture content of 20% or more.