JP3409288B2 - Colored coated metal plate with outstanding uneven pattern - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored film-coated metal plate used for interior / exterior parts of automobiles and household electric appliances, outer plate materials such as steel furniture, and building materials. The metal plate of the present invention is beautifully colored, and has a distinctive pattern in which the uneven pattern of the base metal plate is remarkably raised, and has a unique design property in which unevenness and glitter luster are emphasized. is there.

[0002]

2. Description of the Related Art Conventionally, zinc-based plated metal sheets have been widely used for automobiles, household electric appliances, building materials and the like. Since these zinc-based plated metal plates are insufficient in corrosion resistance and adhesion with paints as they are, they have been subjected to chemical conversion treatment such as chromate treatment or phosphate treatment on the plating layer,
When higher corrosion resistance, chemical resistance, designability, etc. are required, a film is often provided on these chemical conversion treatment layers. In particular, in the case of a metal plate used for applications in which designability is important from the viewpoint of appearance and perfection of color tone, the film corresponding to the outermost coating film must be colored in the color tone required by the user.

With the recent diversification of uses of colored metal plates,
In many cases, an appearance that does not completely hide the color tone of the base material but takes advantage of the metallic luster of the base material is required. For example, even if the bottom and back plates of a refrigerator or a washing machine, FDD parts, cassette chassis, and other parts that are difficult to see from the product appearance, the appearance of the base metal plate is inferior in design, and thus a metallic luster is particularly required. There is a demand for colored metal plates that are beautifully colored while maintaining the metallic luster, in addition to the parts that are made.

[0004]

SUMMARY OF THE INVENTION The present invention has been studied in view of such diversification of uses of the colored metal plate, and its purpose is to provide a novel design property from the viewpoint completely different from the conventional one. Another object is to provide a colored film-coated metal plate. That is, the object of the present invention is to have a distinctive unevenness pattern of the base metal plate, which has a distinctive unevenness pattern. The object is to provide a colored film-coated metal plate having the same.

[0005]

A colored film-coated metal plate having a prominent concavo-convex pattern according to the present invention, which can solve the above-mentioned problems, is a metal plate coated with a film containing a color pigment. A colored film-covered metal plate, which has a gist in that the film thickness T of the film satisfies the following formula (1), preferably the following formula (2). T ≦ L1 + L2 (1) T ≦ (L1 + L2) / 2 (2) Here, the film thickness T (μm) of the film is the basis weight (g / m ² ).
/ Specific gravity (g / cm ³ ), L1 is JIS B
In the cross-sectional curve of the metal plate measured by the method described in 0601, the average value (μ = 5) when the maximum height of a mountain with a width of 0.5 mm or more was measured (n = 5) in any measurement distance of 25 mm.
L2 means the maximum depth of a valley having a width of 0.5 mm or more in an arbitrary measurement distance of 25 mm in a sectional curve of a metal plate measured by the method described in JIS B 0601 (n = 5) means the average value (μm).
In order to obtain the desired appearance, the addition amount of the above color pigment is 30
It is preferable to control the content to be not more than weight%.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted extensive studies to develop new applications of colored film-coated metal sheets. In particular, as a result of intensive research centering on a plated steel sheet having an uneven pattern, if the film thickness of the film is well controlled in relation to the cross-sectional shape of the metal plate, specifically, the convex portion ( If the height, depth, and width of the peaks / recesses (valleys) are well controlled in relation to the film thickness of the film, the unique colored appearance (the unevenness that the metal plate itself has The inventors have found that it is possible to provide a colored metal plate having a distinctive design in which the glittering gloss is emphasized and the shade of the color tone due to the irregularities is more prominently provided, and the present invention has been completed. As described above, there is no unique appearance in which the concavo-convex pattern of the metal plate is outstanding, and it is the first to be provided by the present invention. Moreover, such an appearance can be achieved for the first time by means unique to the present invention, in which the film thickness of the film is well controlled in relation to the cross-sectional shape of the metal plate. That is, in the present invention, the technical significance of the present invention lies in the fact that a novel colored metal plate excellent in designability can be achieved by an original method.

Each requirement constituting the present invention will be described below.

First, the film thickness T of the film, which is the most important point of the present invention, will be described. As described above, the colored film-coated metal plate having a prominent concavo-convex pattern according to the present invention is a colored film-coated metal plate in which a film containing a color pigment is coated on the metal plate. The thickness T is characterized by satisfying the above formula (1), preferably the above formula (2). In other words, in order to obtain the desired appearance, the film thickness T of the film is well controlled in relation to the height / depth and width of the convex portion (mountain) / concave portion (valley) of the sectional curve of the metal plate. However, the most important point of the present invention exists, and in the present invention, in order to make the uneven pattern of the base metal plate stand out, a film containing a color pigment is coated with a predetermined thickness.
According to the results of the study conducted by the present inventors, it has been clarified that when the film thickness T exceeds the above formula (1), the appearance intended by the present invention cannot be obtained (see Examples described later).

Here, in order to further clarify the meaning of L1 and L2 in the above equation (1) or equation (2), FIG.
In addition, the cross-section curve of the 55% Al-Zn plated steel sheet (JIS
(Measured by the method described in B 0601). First, the height of a peak and a valley having a width of 0.5 mm or more is measured by taking an arbitrary measurement distance of 25 mm in the above section curve. Among them, the peak with the maximum height and the valley with the maximum depth are selected, and the maximum height and the maximum depth are designated as L1 ′ and L2 ′, respectively. At another arbitrary measuring distance (25 mm), the maximum height and the maximum depth of the peaks and valleys having a width of 0.5 mm or more were measured in the same manner, and the average value of n = 5 was determined as L1 and L2. .

The film thickness T of the above-mentioned film is the basis weight (g / m
² ) / specific gravity (g / cm ³ ) In the present invention, since the metal plate having an uneven pattern (that is, having an uneven cross-sectional shape) is used as the base metal plate, the thickness of the film coated on the metal plate is uniquely defined. It is difficult to determine. Therefore, in the present invention, the film thickness T of the coating is expressed by the ratio of the basis weight to the specific gravity as described above.

As described above, in the present invention, the uppermost point of the film thickness T of the film is well controlled in relation to the cross-sectional shape of the metal plate to give a desired appearance, and the most important point exists. The lower limit of the film thickness T of the film is determined not from the viewpoint of obtaining a desired design property but from the viewpoint of obtaining a coloring effect by adding a coloring pigment. In order to obtain such a coloring effect, the film thickness T of the film is preferably 0.1 μm or more. It is preferably 0.2 μm or more, more preferably 0.
It is 3 μm or more.

Next, the metal plate used in the present invention will be described. As described above, the present invention requires that the film thickness T of the coating satisfy the above formula (1) or (2). However, if this is reversed, the metal plate used in the present invention is , The width / maximum height / maximum depth of the convex portion (mountain) / concave portion (valley) of the sectional curve of the metal plate measured by the method described in JIS B 0601 is expressed by the above formula (1) or (2). Means that it is necessary to satisfy. Therefore,
Any metal plate satisfying such requirements can be used in the present invention. For example, it is possible to use a metal plate or the like provided with a desired uneven pattern by changing manufacturing conditions and the like.

Examples of such metal plates include various alloy steel plates such as mild steel and stainless steel plates, Al / Al alloy plates, Cu / Cu alloy plates, Ti / Ti alloy plates, or these metal plates. Zn / Zn alloy plating, Al / Al
Various plated metal plates that have been subjected to alloy plating, Cu-based plating, Ni-based plating, Cr-based plating, etc., or metal plates that have been subjected to chemical conversion treatment such as phosphate treatment, chromate treatment, etc., and satisfy the above requirements. A wide range of metal plates can be used.

Among them, the 55% Al-Zn plated steel sheet (galvalume; GL) and the hot dip galvanized steel sheet (regular spangle; GI) have a unique concavo-convex pattern (spangle pattern) and are in a particularly recommended mode. is there. When a steel plate having such an uneven pattern is coated with a film satisfying the above relational expression (1), the uneven pattern is remarkably uneven.
It is particularly effective because a colored steel sheet having a unique design property in which glitter gloss is emphasized is obtained.

Next, the colorant used in the present invention will be described. The meaning of the colorant in the present invention is not to color the film, but to emphasize the uneven pattern of the base metal plate, and to emphasize the uneven feeling, glitter pattern and the like.
Therefore, the use of a transparent (colorless) pigment is not suitable in the present invention in this sense as well.

The colorant is not particularly limited, and a known colorant can be used. However, it is preferable to use a color pigment from the viewpoint of light resistance and the like, and particularly a fine particle having excellent dispersibility in a paint. It is recommended to use the color pigment of
Of these, organic pigments having a small hiding power are preferable. This is because the concave-convex pattern of the base metal plate can be more prominently raised, and desired design can be exhibited.

Specifically, the following coloring pigments can be used for coloring in a desired color.

Red: Insoluble azo type (naphthol type and anilide type) or soluble azo type, organic type pigments such as quinacridone magenta 122, inorganic type pigments such as red iron oxide, cadmium red, red lead, etc. Yellow: insoluble azo type ( Naphthol-based and anilide-based), soluble azo-based, quinacridone-based, organic pigments such as benzimidazolone yellow H2G, chrome yellow,
Inorganic pigments such as cadmium yellow, nickel titanium yellow, yellow tan, strontium chromate, green: organic phthalocyanine pigments, blue: organic phthalocyanine pigments, dark blue, ultramarine blue, cobalt blue, emerald green, black pigments: aniline Organic pigments such as black and carbon black, inorganic pigments such as iron black, white: inorganic pigments such as titanium oxide, calcium carbonate, zinc oxide, barium sulfate, lithopone and lead white, purple: dioxazine violet PV-23 Organic pigments such as.

Among the above color pigments, two or more color pigments having the same color but different chemical structures, or different color pigments are mixed at an appropriate mixing ratio to obtain a desired color such as gray, brown, purple, orange or golden. It is possible to color. By using various pigments together, the color tone of the resin-coated metal plate can be controlled in various ways.

The amount of the color pigment added is preferably 30% by weight or less. In the present invention, from the viewpoint of giving a desired design property by remarkably raising the uneven pattern of the base metal plate, the addition amount of the color pigment is preferably small, and when added in a large amount, the pattern of the base metal plate Will be hidden. From this viewpoint, in the present invention, the upper limit of the color pigment is set to 30% by weight. It is more preferably 20% by weight or less. The lower limit is preferably 0.1% by weight. This is because the coating cannot be colored unless it is added more. More preferably 0.2% by weight
That is all.

Incidentally, an embodiment in which an organic pigment and an inorganic pigment are used in combination is also included in the scope of the present invention, but in that case, it is preferable that these pigments in total satisfy the above range. However, since the inorganic pigment has a larger hiding power than the organic pigment, it is recommended to appropriately control the mixing ratio of the two and increase the content ratio of the organic pigment as compared with the inorganic pigment. In detail, it is recommended to adopt an appropriate mixing ratio depending on the type of pigment used, but generally, the organic pigment and the inorganic pigment are controlled within a weight ratio range of 10: 0 to 7: 3. It is preferable.

The average particle diameter of the above color pigment is 0.0
It is preferably 5 to 1.0 μm. If it is less than 0.05 μm, the coloring effect of the film is small and the design may be poor. On the other hand, if it is larger than 1.0 μm, the proportion of the large-diameter pigment exposed on the surface of the coating film increases as the pigment concentration increases, so that the pigment may fall off during sliding of the obtained colored coated metal plate. The color tone may change. Further, if the particle size of the pigment is large, the dispersibility in the paint is poor, and it is difficult to obtain a uniformly colored coating film. A more preferable range of the particle size of the pigment is 0.1 to 0.7 μm.

Next, the colored film is not particularly limited,
Inorganic / organic single or composite coatings can be applied. As the organic film, specifically, a polyethylene-based, polyurethane-based, polyester-based, epoxy-based, acrylic-based resin or the like can be used, and a resin obtained by mixing and modifying these resins may be used. For example, it is also preferable to introduce a functional group into the base resin to improve the adhesion with the color pigment. In addition, since the organic solvent-based coating composition has a bad working environment and requires a facility for recovering a volatile solvent, in the present invention, it is recommended to use a water-dispersible coating composition or a water-soluble resin solution containing a color pigment. .

Further, the additive to be added to the resin is not particularly limited, and known additives can be used as long as the desired design is not impaired. Examples of such additives include matting agents, waxes, defoaming agents, aggregates, leveling agents and the like.

In the metal plate of the present invention, in order to secure the adhesion between the metal plate and the film, chromate treatment,
A known undercoating treatment such as phosphate treatment may be applied.

Next, a method for producing the colored film-coated metal plate of the present invention will be described. The colored film-covered metal plate of the present invention can be produced by applying a coating material containing the above resin component to the surface of the original plate by a known coating method and drying. The coating method is not particularly limited, for example, the surface is cleaned, and if necessary, pre-coating treatment (for example, phosphate treatment, chromate treatment, etc.) is applied to the long metal strip surface, roll coater method, spray method, Examples thereof include a method in which a coating material is applied using a curtain flow coater method and the like, which is passed through a hot air drying oven to be dried. The roll coater method is practically preferable in consideration of the uniformity of the film thickness, the treatment cost, and the coating efficiency.

The metal plate to be coated with resin may be subjected to a phosphate treatment or a chromate treatment as a pretreatment for coating in order to improve the adhesion to the coating or the corrosion resistance.
However, regarding the chromate-treated material, from the viewpoint of chromium elution during use of the resin-coated metal plate, C during chromate treatment was used.
It is preferable to suppress the amount of adhering r to 35 mg / m ² or less. Within this range, the colored film-coated metal plate of the present invention can suppress the elution of chromium from the underlying chromate-treated layer. In addition, the conventional chromate-treated material has a tendency that the water-resistant adhesion of the top coating, which is provided as necessary, tends to decrease in a wet environment with the elution of hexavalent chromium. In that case, since elution is suppressed, the water-resistant adhesion of the top coat does not deteriorate.

The present invention will be described in more detail with reference to the following examples, but the following examples are not intended to limit the present invention, and any modification and implementation without departing from the spirit of the present invention are included in the present invention.

[0029]

EXAMPLE In this example, the representative plated steel sheets shown in Tables 1 to 3 were used, on which chromate treatment was applied (C
r: 20 mg / m ² ) and then applying a resin solution containing various pigments to the polyester resin, and drying to obtain N
The respective test materials of o.1-39 were obtained. Among the coloring pigments in the table, "PY
"-120" means an organic pigment called benzimidazolone yellow; "PR-122" means an organic pigment called quinacridone magenta; "PV-23" means an organic pigment called dioxazine violet. A: The valve shell is an inorganic pigment. In the above table, the cross section of each metal plate was further measured by the method described in JIS B 0601,
The numerical values of L1 and L2 calculated in the same manner as above, and the type and addition amount of the color pigment used are also shown.

The appearance of the colored film-coated metal plate thus obtained was visually evaluated according to the following criteria. ⊚: The unevenness pattern of the metal plate is remarkably raised, and the design is excellent. ◯: The unevenness pattern of the metal plate is lifted and the design is good. Δ: The unevenness pattern of the metal plate is slightly raised, and there is some design. X: The unevenness pattern of the metal plate is not recognized and the design is poor.

The results are shown in Tables 1-3.

[0032]

[Table 1]

[0033]

[Table 2]

[0034]

[Table 3]

First, Table 1 is an example in which a 55% Al-Zn plated steel plate is used as a base plate. The above steel sheet has a unique spangle pattern, and in Nos. 1 to 9 in which the film thickness T of the film satisfies the range of the above formula (1), the pattern can conspicuously give excellent designability. did it. Above all, the above film thickness T
Nos. 2 to 6, which satisfy the range of the above formula (2), were particularly excellent in designability.

On the other hand, in Nos. 10 to 13 in which the film thickness T of the film does not satisfy the range of the above formula (1), the desired appearance was not obtained.

Next, Nos. 14 to 25 in Table 2 are examples of using a hot-dip galvanized steel sheet as an original plate, which is a plated steel sheet known as so-called regular spangle. Also in the above steel plates, Nos. 14 to 21 in which the film thickness T of the film satisfies the range of the above formula (1) were able to impart desired designability. Among them, Nos. 14 to 18 in which the film thickness T satisfies the range of the above formula (2) were particularly excellent in designability.

On the other hand, in Nos. 22 to 25 in which the film thickness T of the film does not satisfy the range of the above formula (1), the desired appearance was not obtained.

No. 26 is an example in which an electrogalvanized steel plate is used as the original plate, but L1 and L2 of the original plate calculated by the above method are 0, and the peaks having a width of 0.5 mm or more and The desired appearance was not obtained because there were no valleys at all.

No. 27 to 28 are 55% Al-Z
Using n-plated steel plate as a base plate and PR as a color pigment
In this example, -122 and PV-23 are used, but since the film thickness T of the coating satisfies the range of the above formula (1), excellent designability is obtained.

The above is an experimental example in which 10% by weight of the coloring pigment is used and the film thickness T of the film is variously changed. In Table 3, the film thickness T of the film is kept constant and each metal plate is colored. Experimental examples in which the type and addition amount of pigment are changed are shown below.

First, Nos. 29 to 39 are 55% Al-Z
Using n-plated steel plate as the original plate, the film thickness T of the film is 6 μm
And the film thickness T satisfies the range of the above formula (2). Of these, No. 35 did not satisfy the requirements of the present invention because the addition amount of the coloring pigment was 0, and the desired colored appearance was not obtained. Further, in No. 36, since the addition amount of the color pigment exceeded the preferable requirements of the present invention, the spangle pattern of the original plate was hidden, and the desired designability could not be obtained. Further, No. 38 is an example in which PY-120, which is an organic pigment, and a valve shell of an inorganic pigment are used together, and the ratio of the organic pigment is higher than that of the inorganic pigment. No. 37, which used only PY-120, which is an organic pigment, and a valve shell, which is an inorganic pigment, and has a large mixing ratio of the valve shell N
Compared with o.38, it is extremely superior in designability, and its degree is the above No. 30 to 33 using only organic pigments.
It was about the same.

[0043]

Since the resin-coated metal sheet of the present invention is constructed as described above, it is beautifully colored, and the unevenness pattern of the base metal sheet is conspicuous, and the unevenness and glitter luster are unique. It was possible to obtain a metal plate having a design property.

[Brief description of drawings]

FIG. 1 is a cross-sectional curve of a 55% Al-Zn plated steel sheet, J
It is the figure measured by the method as described in IS B 0601.

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Claims (3)

(57) [Claims] 1. A colored film-coated metal plate in which a film containing a color pigment is coated on a metal plate, wherein the film thickness T of the film satisfies the following formula (1). A colored film-coated metal plate having a prominent concavo-convex pattern. T ≦ L1 + L2 (1) Here, the film thickness T (μm) of the film is expressed by the basis weight (g / m ² ) / specific gravity (g / cm ³ ), and L1 is the method described in JIS B 0601. In the measured sectional curve of the metal plate, an arbitrary measurement distance of 25 mm
Measure the maximum height of a mountain with a width of 0.5 mm or more (n =
5) means an average value (μm), and L2 is an arbitrary measurement distance of 25 mm in a sectional curve of the metal plate measured by the method described in JIS B 0601.
Measure the maximum depth of a valley with a width of 0.5 mm or more (n =
5) means the average value (μm). 2. The colored film-coated metal plate according to claim 1, wherein the film thickness of the resin coating film satisfies the following expression (2). T ≦ (L1 + L2) / 2 (2) In the formula, T, L1 and L2 have the same meanings as before. 3. The colored film-coated metal plate according to claim 1, wherein the amount of the color pigment added is 30% by weight or less.