CN109715390B - Coated metal plate - Google Patents

Coated metal plate Download PDF

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Publication number
CN109715390B
CN109715390B CN201680089296.6A CN201680089296A CN109715390B CN 109715390 B CN109715390 B CN 109715390B CN 201680089296 A CN201680089296 A CN 201680089296A CN 109715390 B CN109715390 B CN 109715390B
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coating film
metal plate
coated metal
average
metal sheet
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CN109715390A (en
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尾和克美
中根悠悟
杉田修一
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Nippon Steel Nisshin Co Ltd
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Nisshin Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/16—Antifouling paints; Underwater paints
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/08—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of metal, e.g. sheet metal

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The purpose of the present invention is to provide a coated metal sheet having excellent stain resistance, no interference fringes, and excellent design properties. The coated metal sheet has: a metal plate; and a coating film formed on at least one surface of the metal plate and substantially containing a composition represented by formula K2O·xSiO2The composition of (1), wherein x is 3.5 ≦ x<6.8. In the coated metal sheet, the coating film has arbitrary 10 parts and is per 1mm2The average coating film coverage of (2) is 1 to 90%.

Description

Coated metal plate
Technical Field
The present invention relates to a coated metal sheet.
Background
For door materials, operation panels, and the like of elevators, stainless steel sheets having improved design properties by etching, coloring, surface treatment, or the like are used. These stainless steel sheets are required to have low adhesion of fingerprints and the like, high contamination resistance, high scratch resistance, and the like. Therefore, a coating film containing resin, wax, oil, or the like is generally formed on the surface of the stainless steel sheet.
However, when a coating film containing a resin is formed on the surface of a stainless steel sheet, cracks, whitening, and the like are generated in the coating film with time, and the design property is easily impaired. In addition, the wax or oil needs to be regularly recoated.
Therefore, it is studied to form a coating film containing an inorganic material on the surface of a stainless steel sheet (for example, patent document 1). The coating film containing an inorganic material has advantages of less change with time and high hardness.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-1685
Disclosure of Invention
Problems to be solved by the invention
However, when the thickness of the coating film containing an inorganic material is small, light reflected from the surface of the metal plate and light reflected from the surface of the coating film easily interfere with each other, and color unevenness, coloring, or the like (hereinafter, also referred to as "interference fringes") is easily generated. On the other hand, if the thickness of the coating film is increased, the texture (gloss, etc.) derived from the metal plate is easily lost, and the design is easily impaired. In addition, it is also conceivable to include the pellets in the coating film in order to suppress the interference fringes, but in this case, the transparency of the coating film is also easily lowered, and the design property is easily impaired.
The present invention has been made in view of such circumstances. That is, an object of the present invention is to provide a coated metal sheet having excellent contamination resistance, no interference fringes, and excellent design properties.
Means for solving the problems
The present invention provides the following coated metal sheet.
[1]A coated metal sheet having: a metal plate; and a coating film formed on at least one surface of the metal plate and substantially containing a composition represented by formula K2O·xSiO2The composition of (1), wherein x is 3.5 ≦ x<6.8 Each 1mm of the coating film having arbitrary 10 sites2The average coating film coverage of (2) is 1 to 90%.
[2] The coated metal sheet according to [1], wherein the average coating film coverage is 3% to 80%.
[3] The coated metal sheet according to [1] or [2], wherein the coating film comprises a plurality of films formed in an island shape, and an average maximum width of the films is 500 μm or less.
Effects of the invention
According to the present invention, a coated metal sheet having excellent contamination resistance, no interference fringes, and excellent design properties can be obtained.
Drawings
Fig. 1A is an SEM (Scanning electron microscope) image of the coated metal plate produced in example (No.4), and fig. 1B is an image obtained by measuring Si distribution in this region and binarizing the Si distribution by EDS (Energy Dispersive X-ray spectroscopy).
Fig. 2A is an SEM image of the coated metal plate produced in example (No.5), and fig. 2B is an image obtained by measuring Si distribution in the area by EDS and binarizing the measured area.
Fig. 3A is an SEM image of the coated metal plate produced in example (No.8), and fig. 3B is an image obtained by measuring Si distribution in the area by EDS and binarizing the measured area.
Fig. 4A is an SEM image of the coated metal plate produced in example (No.9), and fig. 4B is an image obtained by measuring Si distribution in the area by EDS and binarizing the measured area.
Detailed Description
The present invention relates to a coated metal sheet having a metal sheet and a coating film discontinuously formed on the metal sheet. The coated metal sheet can be suitably used for door materials and operation panels of elevators, outer panels of home electric appliances, furniture and furnishings, building materials, and the like.
As described above, in order to improve the stain resistance and the like of the metal plate, it has been studied to form a coating film containing an inorganic material on the surface of the metal plate. However, when a relatively thin coating film is formed on the surface of the metal plate, interference fringes tend to occur. On the other hand, if the thickness of the coating film is increased, the design of the metal plate is easily impaired. In addition, in the conventional coated metal sheet, a coating film is formed on the metal sheet in a uniform thickness and without unevenness from the viewpoint of stain resistance and the like.
In contrast, the present inventors have found that interference fringes are less likely to occur by discontinuously forming a coating film, and found that the composition formula K is substantially contained2O·xSiO2(3.5≦x<6.8), sufficient stain resistance can be obtained even if the coating film is discontinuous.
The mechanism of exhibiting contamination resistance even if the coating film covering the metal plate is discontinuous may be as follows. The coating film containing the composition is eluted with a slight amount of potassium on the surface. Further, the potassium ions hydrate with moisture in the atmosphere, and attract moisture in the atmosphere. As a result, not only the coating film formation region but also the region between the coating films, that is, the region where the metal plate is exposed, is covered with a thin water film. Therefore, even if oil stains such as sebum or oily ink adhere to the surface of the coated metal plate, the stains are in a state of floating on a water film, and can be easily removed by wiping or the like.
In addition, in general, when a certain period of time has elapsed after the adhesion of the dirt to the surface of the coated metal sheet, a part of the components of the dirt may infiltrate into the coating film or the metal sheet, and the removal of the dirt becomes difficult. In contrast, in the coated metal sheet of the present invention, a water film having a sufficient thickness is present on the surface of the coated metal sheet, and therefore, it is difficult for the fouling components to penetrate into the coated metal sheet. Further, since the coating film has high hydrophilicity, water easily penetrates between the surface of the coated metal sheet and the dirt. Therefore, dirt adhering to the surface of the coated metal sheet can be peeled off by wiping with water or the like.
The coating film may be formed on only one surface of the metal plate, or may be formed on both surfaces. The coating film may be formed only in a part of the area of the metal plate, or may be formed on one surface or all of the surfaces of the metal plate.
Herein, any of those having a coating filmOf 10 parts per 1mm2The average coating film coverage (hereinafter, also referred to as "average coating film coverage") of (a) is 1% to 90%, preferably 3% to 80%, more preferably 10% to 80%, and still more preferably 15% to 80%. When the average coating film coverage is within the above range, interference fringes are less likely to occur, and contamination resistance is more likely to be exhibited. In addition, for the area (1 mm) where the coating film coverage was determined2) The shape of (b) is not particularly limited, and may be any shape such as a rectangle such as a square or a rectangle, or a circle, but is usually a rectangle. The average coating film coverage was determined by the following method.
Arbitrary 10 sites (1 mm) in the region where the coating film was formed were subjected to SEM (scanning electron microscope)/EDS (energy dispersive X-ray spectrometry)2Region (d) was measured. Next, the obtained Si distribution image is binarized by image processing software. In binarization, a region where Si is increased even slightly is treated as a region where a coating film is present, based on the detected Si value of a portion (metal plate) where no coating film is formed. Then, the coating coverage was calculated by dividing the number of pixels of the region where Si was added (region where the coating was present) by the total number of pixels from the obtained binarized image. Then, the average of these coating film coverage was set as the average coating film coverage.
Here, the coating film preferably includes a plurality of films formed in an island shape. The island-shaped film is a film which is formed discontinuously and is separated from other films. When the average coating film coverage is 50% or less, the film is easily formed into an island shape. In addition, the outer peripheral length of each film is usually at most 1600 μm or less. Further, the shape of each film or the interval between films is not particularly limited. The plurality of films may be formed in a uniform shape or in a non-uniform shape. Further, they may be formed at uniform intervals or at non-uniform intervals. However, it is preferable that the plurality of films are formed on the metal plate at a substantially uniform density. If the film formation density is too high, the above-described effects may not be sufficiently obtained. Further, if the area of each film is too large, the presence or absence of the film is easily visually checked. Therefore, when the coating film includes a plurality of island-shaped films, the average maximum width of the film is preferably 500 μm or less, and more preferably 10 to 200 μm. The maximum width of each film was obtained from the binarized image, and the average of the maximum widths of arbitrary 10 films was defined as the average maximum width.
The average thickness of the coating film is preferably 0.05 to 3 μm, more preferably 0.1 to 0.6. mu.m. When the average thickness of the coating film is 0.05 μm or more, the above-mentioned effects can be easily obtained sufficiently. On the other hand, if the average thickness of the coating film is 3 μm or less, the visible light transmittance of the coating film is sufficiently high, and the texture derived from the metal plate is not easily impaired. The average thickness of the coating film was measured by arbitrarily cutting the coated metal sheet and observing the cut surface. Specifically, a test piece cut out from a coated metal plate is embedded in a resin, and then an appropriate cross section is prepared by polishing or the like, and a highly accurate observation cross section is prepared by ion polishing or the like. Then, any 10 sites where the coating film was present were observed by SEM or TEM (Transmission Electron Microscope), and the average of the thicknesses of the 10 sites was defined as the average thickness.
Here, the metal plate in the coated metal plate of the present invention is not particularly limited, and for example, austenitic stainless steel such as SUS304 and SUS316, and ferrite stainless steel such as SUS430 may be used. For applications requiring mechanical strength, a material obtained by working and solidifying austenitic or ferritic stainless steel by cold rolling, a martensitic stainless steel sheet such as SUS410 or SUS420, or a precipitation hardening stainless steel sheet such as SUS631 is preferably used. In addition to stainless steel sheets, copper, carbon steel, iron-nickel alloy, various plated steel sheets, and aluminum sheets may be used.
These metal plates may be those having been subjected to surface processing according to a conventional method. The metal plate may be a metal plate subjected to smooth surface finishing such as bright annealed finishing (bright annealed finishing) or mirror finishing (mirror finishing), or may be a metal plate subjected to linear grinding such as hair line finishing (hair line finishing) for design or functionality. Further, the polishing device may be a metal plate subjected to curved polishing such as vibration polishing, or may be a metal plate subjected to spot-like unevenness. Further, the metal plate may be colored by various methods such as oxidation coloring and sputtering coloring.
On the other hand, the coating film substantially comprises a composition represented by the formula K2O·xSiO2(3.5≦x<6.8) can be prepared by using potassium silicate (K)2O·nSiO2(2 ≦ n ≦ 4) and colloidal Silica (SiO)2) The mixed solution of (3) is coated and dried to obtain a membrane. Furthermore, the above composition formula K2O·xSiO2The state of the elements in the coating film is not shown, but the ratio of the constituent elements is shown. In the coating film, usually SiO2Forming a siloxane bond. On the other hand, potassium is present as potassium ions, and is electrically attracted to silicate ions that do not form siloxane bonds. As described above, the coating film exhibits high hydrophilicity, which is considered to be exhibited by high hydration of potassium ions eluted in a minute amount from the surface of the coating film and hydrophilicity of silanol groups.
Silicon dioxide (SiO) represented by x in the above composition formula2) Relative to potassium oxide (K)2O) is not less than 3.5 and less than 6.8, but more preferably not less than 3.8 and not more than 5.2. When the value represented by x is less than 3.5, potassium ions are excessively eluted from the surface of the coating film. Further, a whitening phenomenon (efflorescence) in which the eluted potassium ions react with carbon dioxide in the atmosphere to precipitate as carbonates is likely to occur. When the value represented by x is less than 3.5, it is difficult to form a coating film sufficiently, and the average coating film coverage may not fall within a desired range. On the other hand, if the value represented by x is 6.8 or more, a large amount of colloidal silica needs to be mixed in forming the coating film. As a result, the film forming property is lowered, the average coating film coverage is not within a desired range, or the film does not have sufficient strength. The composition of the coating film can be adjusted by, for example, the mixing ratio of potassium silicate to colloidal silica. The components of the coating film can be processed by EDS, XRF (X ray fluorescence), EPMA (Electron Probe)Micro Analyzer, electron probe Micro Analyzer), etc., and the chemical bonding state of Si can be confirmed by XPS (X-ray Photoelectron Spectroscopy), Infrared (IR), etc.
The coating film is obtained by applying a mixture of potassium silicate and colloidal silica to a metal plate by a predetermined method so as to obtain the average coating film coverage, and drying the coating film. The potassium silicate and the colloidal silica used for forming the coating film may be common agents or industrial chemicals. Examples of the potassium silicate as a commercially available product include: "A potassium silicate" or "2K potassium silicate" manufactured by Nippon chemical industries, "No. 2 potassium silicate" manufactured by Fuji chemical, and "SNOWTEX K2" manufactured by Nissan chemical industries. On the other hand, examples of commercially available products of colloidal silica include: "ADELITE AT" manufactured by ADEKA, SNOWTEX "manufactured by Nissan chemical industries, and SILICADOL" manufactured by Nippon chemical industries.
In addition, a solvent, a leveling agent, an antifoaming agent, and the like may be added to the mixed liquid for forming a coating film, if necessary, together with potassium silicate and colloidal silica. The solid content concentration of the mixed liquid for forming a coating film may be appropriately selected depending on the method of forming a coating film, but from the viewpoint of discontinuously forming a film and controlling a thin film thickness, the solid content concentration is preferably in a relatively low range, and is preferably 1 to 10% by mass.
The method of applying the mixed solution for forming a coating film is not particularly limited as long as the coating film can be formed so that the average coating film coverage is within the above range. For example, the mixed liquid may be applied by a spray gun, an electrostatic atomization device, an ink jet device, a gravure roll transfer device, or the like. When a coating film is formed by a spray gun or an electrostatic atomizer, it is preferable to reduce the nozzle diameter of the spray gun or the electrostatic atomizer or adjust the atomizing pressure in order to adjust the average coating film coverage.
The method for drying the mixed solution is not particularly limited as long as the solvent can be sufficiently volatilized. For example, the drying may be carried out at room temperature, or the heating may be carried out at 80 to 300 ℃. By heating, drying of the solvent water is promoted, and film formation is promoted. Further, by heating to 200 ℃ or higher, formation of siloxane bonds is promoted, and a strong coating film can be obtained in a short time. However, in the case of heating, attention was paid to discoloration (tempering color) of the original plate due to oxidation. The drying time is usually about 10 to 30 minutes in the case of heating, and is sufficient only to 24 hours in the case of drying at room temperature.
[ examples ]
The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.
Coated metal sheets were produced by the following methods, and the presence or absence of contamination resistance and interference fringes on the surfaces of the coated metal sheets was confirmed. As the metal plates, metal plates a to E shown in table 1 below were used.
TABLE 1
Metal plate Steel grade Surface finishing
A SUS316 Vibration grinding
B SUS304 Hair line grinding
C SUS430 Sand blasting
D SUS316 Vibration grinding and sputtering coloring
E SUS304 Hair line grinding and oxidation color development
[ production of coated Metal plate ]
Potassium silicate (product name: potassium silicate No.2, K, manufactured by Fuji chemical Co., Ltd.)2O·nSiO2(n-3.61) or a product name of fuji chemical: potassium silicate number 1, K2O·nSiO2(n-2.04)) and colloidal silica (product name SILICADOL, manufactured by japan chemical industry) were mixed at the mass ratios shown in table 2 in terms of solid content to obtain mixed liquids. The mixed solution was applied to the metal plates a to E by atomizing spray so as to obtain an average coating film coverage shown in table 2. Thereafter, the film was dried at 250 ℃ for 20 minutes to obtain a coating film. The average thickness of the obtained coating film is 0.6 μm or less. The average thickness was measured in the following manner. First, a coated metal plate was cut, and a cut test piece was embedded in a resin and then ground to prepare a cross section. Further, a high-precision observation cross section was prepared by ion milling or the like, and observed by SEM. The thickness was measured at any 10 sites where the coating film existed, and the average value of these was defined as the average thickness.
In addition, each 1mm was measured in the following manner2Average coating film coverage of (1).
First, the element distribution of Si, which is the main component of the coating film, was measured by SEM (trade name: S-3700N, manufactured by Hitachi high-tech Co., Ltd.)/EDS (trade name: X-act, manufactured by Oxford instruments Co., Ltd.). For any 10 parts in the region with the coating filmBit (1 mm)2) The measurement was carried out. Next, the obtained Si distribution image was binarized by image processing software (Adobe corporation, Photoshop). In binarization, a region where Si is increased even slightly is treated as a region where a coating film is present, based on the detected Si value of a portion (metal plate) where no coating film is formed. From the obtained binarized image, the number of pixels of the region where Si is increased (region where the coating film is present) is divided by the total pixels in the region to calculate the coating film coverage. Then, the average of the coating film coverage was calculated and set as the average coating film coverage. Fig. 1 to 4 show SEM images and images obtained by measuring Si distribution in the region and binarizing the measured Si distribution for nos. 4, 5, 8, and 9.
[ evaluation ]
The coated metal sheets obtained in the examples and comparative examples were subjected to an oil ink removal test (contamination resistance), and the presence or absence of interference fringes was confirmed. The results are shown in Table 2.
(1) Oil ink removal test (stain resistance)
The coated metal sheets obtained in examples and comparative examples were painted with an oil-based marker (product name: MAGIC INK (registered trademark) No.700 black, manufactured by Temple chemical industries, Ltd.). Then, after 1 minute and 1 hour after painting, the oil-based ink on the painted portion was wiped with a cloth containing water (product name: BEMCOTM3-II, manufactured by Asahi Kasei corporation), and the degree of marking of the oil-based ink after wiping with water was evaluated. The trace of the oil-based ink was evaluated in the following criteria.
◎ No trace (removal rate 100%)
Good: few traces (removal rate of 90% or more to less than 100%)
△ mark (removal rate is more than 5% and less than 90%)
X: almost not removed (removal rate less than 5%)
(2) Confirmation of interference fringes
The presence or absence of interference fringes was evaluated visually under a standard light source. The following were used under the trade name of X-Rite: MACBETH Judge II as a standard light source device. The reference light is TL 84. The interference fringes were evaluated in the following criteria.
Good: not generated (influence on design: none)
△ slight (influence on design: slight)
X: obviously (influence on design: have)
TABLE 2
Figure BDA0001995124190000081
Figure BDA0001995124190000091
*1K2O·xSiO2Value of medium and x*2Using potassium silicate No.2*3Using potassium silicate No.1
As shown in Table 2, when no coating film was formed (average coating film coverage: 0%), the oily ink marks could not be removed in the oily ink removal test (No. 1). On the other hand, when the average coating film coverage is 1% or more, the oil-based inks (nos. 2 to 16 and nos. 18 to 21) can be removed. However, when the average coating film coverage is 95% or more, interference fringes (nos. 12 and 13) are generated.
In addition, for the composition constituting the coating film, if the composition formula K2O·xSiO2When x of (2) is less than 3.5, whitening occurs, and the design of the coated metal sheet is deteriorated (No. 16). On the other hand, if x is 6.8 or more, film formation is not possible (No. 17).
The present application claims priority based on Japanese patent application laid-open at 2016, 9, 16. The contents described in the specification and drawings of this application are all incorporated in the specification of this application.
(Industrial Applicability)
The coated metal sheet of the present invention has excellent stain resistance, no interference fringes, and excellent design properties. Therefore, the coated metal sheet can be suitably used for door materials and operation panels of elevators, exterior panels of home electric appliances, furniture and furnishings, various interior building materials, and the like.

Claims (2)

1. A coated metal sheet having:
a metal plate; and
a coating film formed on at least one surface of the metal plate and substantially containing a composition represented by the formula K2O·xSiO2The composition of (1), wherein x is 3.5 ≦ x<6.8，
1mm per arbitrary 10 sites of the coating film2The average value of the coating film coverage rate is 26-90%,
the average thickness of the coating film is 0.1-0.6 μm.
2. The coated metal sheet as claimed in claim 1,
the coating film includes a plurality of films formed in an island shape,
the average maximum width of the film is 500 [ mu ] m or less.
CN201680089296.6A 2016-09-16 2016-09-21 Coated metal plate Active CN109715390B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016-181356 2016-09-16
JP2016181356A JP6063088B1 (en) 2016-09-16 2016-09-16 Painted metal plate
PCT/JP2016/077822 WO2018051523A1 (en) 2016-09-16 2016-09-21 Coated metal plate

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