JP2002060977A - Colored film coated metallic sheet having conspicious rugged pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a colored film coated metallic sheet having a conspicious rugged pattern in which the rugged pattern of a base metallic sheet is remarkably floated up and provided with peculiar designing properties in which the feeling of ruggedness and sparkling luster are emphasized, and the shade of the color tone is also imparted. SOLUTION: In this colored film coated metallic sheet having a conspicious rugged pattern is obtained by coating the surface of a metallic sheet with a film containing color pigment, the film thickness T of the film satisfies the following inequality (1): T<=L1+L2...(1); wherein, the film thickness T (μm) of the film is expressed by coating weight (g/m2)/specific gravity (g/cm3), and L1/L2 denotes the average value (μm) in the case the maximum height/the maximum depth of the crests/trough with a wide of >=0.5 mm in 25 mm of the optional measured distance in the cross-sectional curve of the metallic sheet measured by the method described in JIS B 0601.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

In recent years, with the diversification of uses of colored metal plates,
There has been an increasing demand for an appearance that does not completely conceal the color tone of the substrate and utilizes the metallic luster of the substrate. For example, the bottom plate and back plate of refrigerators and washing machines, FDD parts, cassette chassis, and other parts that are difficult to see on the product appearance are inferior in design if the appearance of the base metal plate is inferior. In addition to the parts to be colored, there is a demand for a beautifully colored metal plate while maintaining metallic luster.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the diversification of uses of such a colored metal plate, and its object is to provide a novel design from a completely different viewpoint. To provide a colored coated metal sheet. That is, the object of the present invention is to have a unique design that has a `` conspicuous uneven pattern '' in which the uneven pattern of the base metal plate is remarkably raised, the uneven feeling, the glittering gloss is emphasized, and the shading of the color tone is also given. To provide a metal sheet coated with a colored film.

[0005]

According to the present invention, which is able to solve the above-mentioned problems, a metal plate coated with a colored film having a marked uneven pattern is obtained by coating a metal plate with a film containing a colored pigment. It is a metal plate coated with a colored film, wherein the film thickness T of the film satisfies the following expression (1), preferably the following expression (2). T ≦ L1 + L2 (1) T ≦ (L1 + L2) / 2 (2) Here, the film thickness T (μm) 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 No. 0601, the average value (μ) when the maximum height of a peak having a width of 0.5 mm or more was measured (n = 5) at an arbitrary measurement distance of 25 mm.
m), and L2 measures the maximum depth of a valley having a width of 0.5 mm or more at an arbitrary measurement distance of 25 mm in a cross-sectional curve of a metal plate measured by the method described in JIS B 0601 (n = 5) means the average value (μm) when performing
In order to obtain a desired appearance, the amount of the color pigment added should be 30
It is preferable to control the amount to not more than the weight%.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have been studying to develop a new use of a metal sheet coated with a colored film. In particular, the present inventors have conducted intensive studies on plated steel sheets having an uneven pattern, and found that if the film thickness of the film is properly controlled in relation to the cross-sectional shape of the metal sheet, specifically, the convex portion ( If the height / depth and width of the peaks / concavities (valleys) are properly controlled in relation to the film thickness of the film, a unique colored appearance (the unevenness of the metal plate itself, The present inventors have found that a colored metal plate having a unique design property in which the glittering luster is emphasized and the color tone caused by the uneven portion is more remarkably provided can be provided, and the present invention has been completed. Such a unique appearance in which the unevenness pattern of the metal plate is conspicuous has never existed before, and is provided for the first time 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 that a novel colored metal plate having excellent design properties can be achieved by a unique method.

Hereinafter, each requirement constituting the present invention will be described.

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 marked uneven pattern according to the present invention is a colored film-coated metal plate in which a film containing a color pigment is coated on a metal plate, and the film of the film is coated. The thickness T is characterized by satisfying the above equation (1), preferably the above equation (2). In other words, in order to obtain a desired appearance, the film thickness T of the film is well controlled by the relationship between the height, depth, and width of the convex portions (peaks) and concave portions (valleys) in the cross-sectional curve of the metal plate. Thus, the most important point of the present invention exists. In the present invention, a coating containing a coloring pigment is coated to a predetermined thickness in order to make the uneven pattern of the base metal plate stand out.
According to the study results of the present inventors, it has been clarified that, when the film thickness T exceeds the above equation (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 (2), FIG.
The cross-sectional curve of a 55% Al-Zn plated steel sheet (JIS
B0601). First, an arbitrary measurement distance of 25 mm is taken in the cross-sectional curve, and the heights of peaks and valleys having a width of 0.5 mm or more are measured. Among them, a peak having a maximum height and a valley having a maximum depth are selected, and the maximum height and the maximum depth are defined as L1 ′ and L2 ′, respectively. At another arbitrary measurement 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 values of n = 5 were determined as L1 and L2. .

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

As described above, in the present invention, the most important point exists where the upper limit of the film thickness T of the film is properly controlled in relation to the cross-sectional shape of the metal plate and a desired appearance is given. The lower limit of the film thickness T of the film is determined not from 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, it is preferable that the film thickness T of the film is 0.1 μm or more. It is preferably at least 0.2 μm, more preferably 0.1 μm.
3 μm or more.

Next, the metal plate used in the present invention will be described. As described above, in the present invention, it is necessary that the film thickness T of the film satisfies the above expression (1) or (2). , The width / maximum height / maximum depth of the protrusions (peaks) / recesses (valleys) in the cross-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, a metal plate or the like provided with a desired uneven pattern by changing manufacturing conditions or the like can be used.

Examples of such a metal plate include not only various steel plates such as mild steel and stainless steel plate, but also Al.Al alloy plate, Cu.Cu alloy plate, Ti.Ti alloy plate, or these metal plates. Zn / Zn alloy plating, Al / Al
Various types of plated metal plates that have been subjected to alloy plating, Cu-based plating, Ni-based plating, Cr-based plating, etc., and metal plates that have been subjected to chemical conversion treatments such as phosphate treatment and chromate treatment, and satisfy the above requirements. Metal plates can be used widely.

Among them, a 55% Al-Zn plated steel sheet (galvalume; GL) and a hot-dip galvanized steel sheet (regular spangle; GI) have a unique uneven pattern (spangle pattern). is there. If a steel sheet having such a concavo-convex pattern is coated with a film that satisfies the above relational expression (1), the concavo-convex pattern will stand out,
This is particularly effective because a colored steel sheet having a unique design with emphasized glitter can be obtained.

Next, the coloring agent used in the present invention will be described. The significance of the coloring agent in the present invention lies in that, rather than coloring the film, the unevenness pattern of the base metal plate is emphasized, and the unevenness, the glitter pattern, and the like are emphasized.
Therefore, the use of a transparent (colorless) pigment is not suitable in the present invention in this sense.

The colorant is not particularly limited, and a known colorant can be used. However, a color pigment is preferably used from the viewpoint of light resistance and the like. It is recommended to use color pigments of
Among them, an organic pigment having a small hiding power is preferable. Thereby, the concave and convex pattern of the base metal plate can be raised more remarkably, and a desired design property can be exhibited.

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

Red: insoluble azo type (naphthol type and anilide type) or organic pigments such as soluble azo type, quinacridone magenta 122 and the like, inorganic pigments such as red iron, cadmium red, and lead red, yellow: insoluble azo type ( Organic pigments such as naphthol type and anilide type), soluble azo type, quinacridone type, benzimidazolone yellow H2G, chrome yellow,
Inorganic pigments such as cadmium yellow, nickel titanium yellow, yellow tan, strontium chromate, etc., green: organic phthalocyanine pigment, blue: organic phthalocyanine pigment, inorganic pigment such as navy blue, ultramarine, cobalt blue, emerald green, black: 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 And other organic pigments.

Of the above color pigments, those having the same color but different chemical structures, or mixing two or more color pigments of different colors at an appropriate blending ratio, can be used to obtain desired colors such as gray, brown, purple, orange, and golden. It can be colored. When various pigments are used in combination, the color tone of the resin-coated metal plate can be variously controlled.

The amount of the coloring pigment to be added is preferably 30% by weight or less. In the present invention, from the viewpoint of conspicuously raising the uneven pattern of the base metal plate and imparting a desired design property, it is preferable that the amount of the coloring pigment to be added is small, and when a large amount is added, the pattern of the base metal plate is reduced. Is concealed. From such a viewpoint, the present invention sets the upper limit of the color pigment to 30% by weight. It is more preferably at most 20% by weight. The lower limit is preferably set to 0.1% by weight. This is because if it is not added any more, the film cannot be colored. 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 such a case, it is preferable that these pigments satisfy the above range in total. However, since the inorganic pigment has a higher 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 a suitable mixing ratio depending on the type of the pigment used, but generally, the organic pigment and the inorganic pigment are controlled in a weight ratio of 10: 0 to 7: 3. Is preferred.

The average particle size of the color pigment is 0.0
It is preferably from 5 to 1.0 μm. When the thickness is less than 0.05 μm, the coloring effect of the film is small and the design may be lacking. Conversely, if it is larger than 1.0 μm, the proportion of the large-diameter pigment exposed on the coating film surface increases with an increase in the pigment concentration, so that the pigment falls off during sliding of the obtained colored coated metal plate. The color tone may change. In addition, if the particle size of the pigment is large, the dispersibility in the paint is poor, so that 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 color film is not particularly limited.
Inorganic / organic coatings alone or in combination can be applied. As the organic coating, specifically, resins such as polyethylene, polyurethane, polyester, epoxy, and acrylic resins can be used, and resins 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 paint deteriorates the working environment and requires equipment for collecting volatile solvents, in the present invention, it is recommended to use a water-dispersed paint or a water-soluble resin liquid containing a color pigment. .

The additives to be added to the resin are not particularly limited, and known additives can be used as long as the desired design is not impaired. Such additives include matting agents, waxes, defoamers, aggregates, leveling agents, and the like.

In the metal plate of the present invention, a chromate treatment is carried out in order to secure the adhesion between the metal plate and the film.
A known base treatment such as a phosphate treatment may be performed.

Next, a method for producing the metal sheet coated with a colored film of the present invention will be described. The colored film-coated metal sheet of the present invention can be produced by applying a paint containing the above-mentioned resin component to the surface of an original sheet by a known coating method, followed by drying. The coating method is not particularly limited. For example, a roll coater method, a spray method, A method in which a paint is applied using a curtain flow coater method or the like, and then dried by passing through a hot-air drying oven, or the like. The roll coater method is practically preferable in consideration of the uniformity of the film thickness, the processing cost, the coating efficiency, and the like.

The metal plate to be coated with a resin may be subjected to a phosphate treatment or a chromate treatment as a pretreatment for the purpose of improving the adhesion to the film or the corrosion resistance.
However, as for the chromate-treated material, from the viewpoint of chromium elution during use of the resin-coated metal plate, C
It is preferable to suppress the amount of r adhesion to 35 mg / m ² or less. Within this range, the colored film-coated metal sheet of the present invention can suppress elution of chromium from the base chromate-treated layer. In addition, the conventional chromate-treated material has a tendency that the water-resistant adhesiveness of a top coat provided as required decreases in a humid environment with the elution of hexavalent chromium. In this case, the elution is suppressed, so that the water-resistant adhesion of the overcoat film does not deteriorate.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples do not limit the present invention, and all changes and modifications within the scope of the present invention are included in the present invention.

[0029]

EXAMPLE In this example, typical plated steel sheets shown in Tables 1 to 3 were used, and a chromate treatment was applied thereon (C
r: 20 mg / m ² ), and then applying a resin solution containing various pigments added to a polyester resin, followed by drying to obtain N
Each test material of o.1 to 39 was obtained. In the coloring pigments in the table, “PY
"-120" is an organic pigment called benzimidazolone yellow; "PR-122" is an organic pigment called quinacridone magenta; "PV-23" is 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 JISB 0601.
The numerical values of L1 and L2 calculated in the same manner as above, and the type and amount of the coloring pigment used are also shown.

Further, the appearance of the metal sheet coated with a colored film thus obtained was visually evaluated according to the following criteria. ：: The uneven pattern of the metal plate is remarkably raised, and the design is excellent. ：: The unevenness pattern of the metal plate is raised, and the design is good. Δ: The concave and convex pattern of the metal plate is slightly lifted up, and there is a slight design property. ×: No unevenness pattern of the metal plate was observed, and the design was poor.

The results are shown in Tables 1 to 3.

[0032]

[Table 1]

[0033]

[Table 2]

[0034]

[Table 3]

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

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

Next, Nos. 14 to 25 in Table 2 are examples in which a hot-dip galvanized steel sheet is used as an original sheet, which is a plated steel sheet known as a so-called regular spangle. Also in the above steel sheets, Nos. 14 to 21 in which the film thickness T of the film satisfies the range of the above equation (1) could give desired design properties. Among them, Nos. 14 to 18 in which the film thickness T satisfies the range of the above equation (2) were particularly excellent in design.

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

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

Nos. 27 to 28 are 55% Al-Z
Using n-plated steel sheet as original plate and PR as coloring pigment
In the examples using -122 and PV-23, since the film thickness T of the film satisfies the range of the above formula (1), excellent design properties are obtained.

The above is an experimental example in which the color pigment is used in an amount of 10% by weight and the film thickness T of the film is variously changed. An experimental example in which the type and amount of the pigment are changed is shown.

First, Nos. 29 to 39 are 55% Al-Z
Using an n-plated steel plate as a base plate, and forming a film thickness T of 6 μm
And the film thickness T satisfies the range of the above equation (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 a desired colored appearance was not obtained. In No. 36, since the amount of the color pigment added exceeded the preferable requirement of the present invention, the spangle pattern of the original plate was concealed, and a desired design property was not obtained. No. 38 is an example in which a valve shell of an organic pigment is used in combination with PY-120 of an organic pigment and an inorganic pigment, and the ratio of the organic pigment is larger than that of the inorganic pigment. No. 37 using only PY-120 of an organic pigment and a valve shell of an inorganic pigment and having a high mixing ratio of the valve shell
Compared to o.38, the design is extremely excellent, and the degree is as described in No. 30 to 33 using only organic pigments.
Was about the same.

[0043]

Since the resin-coated metal plate of the present invention is constituted as described above, it is beautifully colored, and the unevenness pattern of the base metal plate is conspicuous, and the unique unevenness and glittering gloss are emphasized. Thus, a metal plate having the design of the above was obtained.

[Brief description of the drawings]

FIG. 1 shows the cross-sectional curve of a 55% Al—Zn plated steel sheet as J
It is the figure measured by the method of ISB0601.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D075 CB04 CB21 DC12 DC18 DC38 4F100 AB01A AB03 AK41 BA02 CA13B CC00 EH46 EH71 EJ69 GB07 GB08 GB33 HB21B JL10B JN21 YY00B 4K044 AA02 AB02 BA10 BA15 BA17 BA03 BB01 CA53

Claims (3)

[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 satisfies the following expression (1). A metal plate coated with a colored coating with a distinctive uneven pattern. T ≦ L1 + L2 (1) Here, the film thickness T (μm) of the film is represented by a basis weight (g / m ² ) / specific gravity (g / cm ³ ), and L1 is a method described in JIS B0601. In the measured cross section curve of the metal plate, any measurement distance 25mm
Medium, measure the maximum height of the peak 0.5mm or more (n =
5) means the average value (μm) at the time of performing, and L2 is an arbitrary measurement distance of 25 mm in the cross-sectional curve of the metal plate measured by the method described in JIS B0601.
Medium, measure the maximum depth of the valley with a width of 0.5 mm or more (n =
5) means the average value (μm) when performing 2. The colored coating-coated metal sheet according to claim 1, wherein the thickness of the resin coating satisfies the following expression (2). T ≦ (L1 + L2) / 2 (2) In the formula, T, L1 and L2 have the same meaning as before. 3. The metal plate coated with a colored film according to claim 1, wherein the amount of the coloring pigment added is 30% by weight or less.