WO2006062214A1 - プレコート金属板およびプレコート金属板の製造方法 - Google Patents
プレコート金属板およびプレコート金属板の製造方法 Download PDFInfo
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- WO2006062214A1 WO2006062214A1 PCT/JP2005/022709 JP2005022709W WO2006062214A1 WO 2006062214 A1 WO2006062214 A1 WO 2006062214A1 JP 2005022709 W JP2005022709 W JP 2005022709W WO 2006062214 A1 WO2006062214 A1 WO 2006062214A1
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- Prior art keywords
- layer
- coating
- paint
- metal plate
- interface
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Classifications
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- 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
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- 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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/53—Base coat plus clear coat type
- B05D7/532—Base coat plus clear coat type the two layers being cured or baked together, i.e. wet on wet
- B05D7/5323—Base coat plus clear coat type the two layers being cured or baked together, i.e. wet on wet the two layers being applied simultaneously
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
- B05D2202/15—Stainless steel
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- 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
- B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding
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- 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
- B05D7/50—Multilayers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12472—Microscopic interfacial wave or roughness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12993—Surface feature [e.g., rough, mirror]
Definitions
- the present invention relates to a metal plate, a top clear type pre-coated metal plate excellent in weather resistance, a pre-coated metal plate having both workability and corrosion resistance, and a manufacturing method thereof.
- metal plates are often painted to enhance fouling performance and aesthetics after processing.
- it is often baked and painted after processing.
- Japanese Patent Application Laid-Open No. 6-190 03 6 proposes a method for producing a patterned steel plate.
- a coating material for a polymer polyester-based dop coat is used as a coating material, and the surface of the steel plate is used.
- the upper layer paint was white
- the lower layer paint was black
- the surface tension of each paint was adjusted with a surfactant to generate a pattern.
- 5 m N / m surface tension of the lower layer paint was set to 28 m NZ m, and two layers of these paints were simultaneously applied to a dry film thickness of 10 xm using a slide hopper type coating device. It has been shown.
- top-clear type pre-coated metal plate that consists of multiple coating layers and the outermost layer is a transparent or translucent clear layer, even if the outermost layer deteriorates, choking due to exposure of the pigment (whitening) It is difficult to occur and has an excellent appearance when used for a long time.
- Japanese Patent Application Laid-Open No. 8-30991 7 discloses a pre-coating metal plate that is excellent in end surface corrosion resistance in addition to workability.
- a coating film containing 25% or more of the anti-glare pigment in the coating film is formed on both surfaces of the zinc-based metal plate. is doing. It is described that when the content of the anti-glare pigment is S 0% or more, the workability may be lowered.
- a normal pre-coated metal sheet is produced by separately forming a lower layer coating film and an upper layer coating film by the method of applying twice and baking twice as described above.
- a two-layer paint film consisting of a colored base paint layer and a clear paint layer
- a method of forming a two-layer coating film by one baking is also known (for example, Japanese Patent Laid-Open No. 1 1 1 1 9 5 8 3 Issue gazette).
- a pre-coated steel sheet was manufactured by applying the multi-layer simultaneous coating method described in Japanese Patent Laid-Open Nos. Hei 6_190 035 and JP-A-6-190 036, and the surface of the coated steel sheet was colored. Unevenness sometimes occurred. “Color unevenness” is a phenomenon in which, when the appearance of a coated steel sheet is painted with the naked eye or with a magnifying glass, inhomogeneities observed as spots of colors different from the surrounding colors are observed. '
- the present invention prevents uneven color appearance of a pre-coated metal sheet represented by a pre-coated steel sheet produced by simultaneous multilayer coating using multilayer simultaneous coating, and at the same time improves adhesion between coating films.
- the purpose is to improve uneven color appearance of a pre-coated metal sheet represented by a pre-coated steel sheet produced by simultaneous multilayer coating using multilayer simultaneous coating, and at the same time improves adhesion between coating films.
- An object of the present invention is to provide a top clear type precoated metal sheet excellent in weather resistance, which has solved the above-mentioned drawbacks of the prior art.
- the present inventors have conducted various experiments in order to take advantage of the characteristics inherent in the pleco-glazed steel sheet produced by the multi-layer simultaneous coating.
- the multi-coating film obtained by the multi-layer simultaneous coating method is used.
- waviness is observed at the interface enlarged at a low magnification of 500 times (compared to the interface seen when the upper and lower coating films are separately applied and baked, The upper layer goes into the lower layer, and the lower layer penetrates into the upper layer and waved)), and the interface is further 500 times higher
- magnification we found out that much finer irregularities were seen on the wavy interface itself.
- multi-layer simultaneous coating means that two or more different paint layers are simultaneously applied on a metal plate to form a multi-layer paint film, and then the paint layers are simultaneously dried and baked to form a multi-layer.
- formation of a coating film is as follows.
- the pre-coated metal sheet of the present invention, which prevents uneven color and at the same time improves the adhesion between the coating films, and the gist of the manufacturing method are summarized as follows.
- the tension difference should be 1.2 m N / m or more and less than 5 m NZ m, and the surface
- the upper layer or the upper coating layer is the surface of the metal plate coated with a multilayer simultaneous coating apparatus. 2.
- the lowermost layer or the lower coating layer refers to a coating layer that is adjacent to and below this colored uppermost layer.
- the leveler is a kind of paint surface conditioner, which is also called a leveling agent, and is an additive having the property of uniformizing the paint surface.
- the appropriate leveler addition can be determined by whether or not the surface unevenness of the skin is generated in the wet state when the paint added with the leveler is applied in a single layer. .
- the present invention it is possible to coat two or more coating films at the same time by producing a pre-coated metal sheet by multilayer simultaneous coating without causing uneven color of the coating film.
- the process can be simplified compared to painting.
- a multilayer coating of 3 or more layers is also applied by simultaneous coating. The efficiency can be further improved.
- the inventors of the present invention have also found that a top clear type pre-coated metal plate having excellent weather resistance can be obtained by controlling fine irregularities at the interface with waviness between coating films formed by multilayer simultaneous coating.
- the pre-coated metal plate of the top clear layer excellent in weather resistance according to the present invention is based on this knowledge. More specifically, the metal plate and two or more layers formed on the metal plate using a multilayer simultaneous coating apparatus are used.
- a pre-coated metal plate comprising at least a transparent or translucent upper clear layer and a lower paint layer adjacent to the upper clear layer, and The center line average roughness Ra of the interface between the upper clear layer and the lower coating layer is from 0.3 to 0.7 m.
- a component (curing agent) that reacts with both the coating resin of the layer and the coating resin of the other layer is contained in both or one of the lower coating layer and the upper clear layer.
- the Ra of the interface between the uppermost layer (clear layer) and the lower coating layer adjacent thereto is 0.3 to 0.7 m.
- the combination of the increase in the area of the interface and the increase in the ratio of irregular reflection at the interface suppresses photodegradation at the interface between the clear layer and the lower layer coating film and ensures adhesion. Therefore, it is estimated that the weather resistance can be improved.
- a pre-coated metal plate having a conventional top clear layer In this case, the light transmitted through the top clear layer causes light degradation at the interface with the adjacent colored layer adjacent to the top clear layer. It is presumed that the weather resistance as a pre-coated metal plate was insufficient because it became easier.
- UV absorber which was essential in the conventional top clear type coated plate
- the present inventors further control the fine irregularities of the wavy interface between the multilayer coating films formed by the multilayer simultaneous coating, and also control the presence or absence of the anti-glare pigment in each coating film. It has also been found that a pre-coated metal sheet that achieves both workability and corrosion resistance can be obtained.
- the present inventors have an average content of a lower layer containing 30% by weight or more of an anti-fouling pigment on average, and an anti-fouling pigment that is the same as the anti-fouling pigment in the lower layer.
- the upper layer which has a concentration gradient that gradually decreases as it moves away from the vicinity of the interface with the lower layer, is formed with a multi-layered simultaneous coat, and both of the waviness. It was found that a pre-coated metal sheet with excellent workability and corrosion resistance can be obtained by adjusting the sapphire appropriately.
- the precoat metal plate of the present invention that achieves both workability and corrosion resistance is based on this knowledge, and the outline is as follows.
- the lower coating layer formed on the metal plate using a multilayer simultaneous coating device and An upper coating layer contains an average of 30% by weight or more of the anti-fouling pigment, and the upper coating layer is the same as the anti-fouling pigment in the lower coating layer.
- the pigment is contained at an average content lower than the average content of the lower coating layer and with a concentration gradient that gradually decreases as it moves away from the vicinity of the interface with the lower coating layer.
- a method for producing a pre-coated metal plate in which the surface of the metal plate is coated using a multi-layer simultaneous coating apparatus comprising a lower paint layer containing an anti-fouling pigment and an upper paint layer thereon.
- a multi-layer simultaneous coating apparatus comprising a lower paint layer containing an anti-fouling pigment and an upper paint layer thereon.
- the center line average of the interface between the lower paint layer and the upper paint layer is made to exist in a gradient.
- Roughness Ra should be between 0.3 and 0.7 It characterized
- the method plecos one Bok metal plate having excellent processability and corrosion resistance produced by multilayer simultaneous coating.
- the lower layer anti-glare pigment can be increased, thereby ensuring corrosion resistance and the upper layer.
- the adhesion to the lower layer it is possible to improve the workability of the pre-coated metal plate and further improve the corrosion resistance.
- the pre-coated metal plate having both workability and corrosion resistance of the present invention may be a pre-coated metal plate coated with three or more layers simultaneously. It may be a pre-coated metal plate having a clear coat as a top coat on two layers containing an anti-glare pigment so as to satisfy the requirements of the invention.
- Figure 1 shows the relationship between the surface tension difference between the lower and upper layers and the uneven color score.
- Figure 2 is another diagram showing the relationship between the difference in surface tension between the lower and upper layers and the uneven color score.
- 3A and 3B are diagrams illustrating the interface between the lower coating layer and the upper coating layer of the precoated metal sheet according to the present invention.
- 4A and 4B are scanning micrographs of the cross section of the precoated metal sheet according to the present invention.
- FIG. 5 is a diagram for explaining the Ra evaluation method for the interface between the lower layer and the upper layer.
- FIG. 6 is a diagram for explaining the interface when the lower layer contains a pigment.
- Fig. 7 is a schematic perspective view of a slide hopper type force ten-ten coating device.
- Figure '8 is a diagram illustrating a sample of a coated metal sheet that has been subjected to a salt spray test (SST).
- SST salt spray test
- Fig. 9 is a diagram for explaining the cross-cut part of the coated metal sheet sample subjected to the salt spray test.
- FIG. 10 is a diagram for explaining an end face of a coated metal sheet sample subjected to a salt spray test.
- FIG. 11 is a schematic diagram for explaining a production line for pre-coated steel sheets used in Examples.
- the pre-coated metal plate of the present invention has a coating film having a multilayer structure of two or more layers formed on various metal plates by multilayer simultaneous coating.
- the base metal plate for example, a steel plate, an aluminum plate, a titanium plate or the like can be used, but the metal plate is not limited to these.
- the metal plate may be pre-painted.
- primer coating can be applied to the metal plate before coating with the multi-layer simultaneous coating device, with or without pre-coating treatment.
- Examples of usable steel sheets include cold-rolled steel sheets, hot-rolled steel sheets, zinc-plated steel sheets, alloyed zinc-plated steel sheets, zinc-ferrous gold-plated steel sheets, zinc-alloy alloy-plated steel sheets, aluminum-plated steel sheets, chromium Steel sheets such as plated steel sheets, nickel-plated steel sheets, zinc-nickel alloy plated steel sheets, and tin-plated steel sheets.
- the steel sheet can be pretreated if necessary.
- Examples of the base treatment include water washing, hot water washing, pickling, alkali degreasing, grinding, polishing, chromate treatment, zinc phosphate treatment, composite oxide film treatment and other non-chromate treatments. These can be used alone or in combination for pre-painting of steel sheets.
- “color unevenness” in the present invention is a coating film defect caused by waviness due to mutual penetration of the upper and lower layers, which is recognized in the cross section of the multilayer coating film formed by multilayer simultaneous coating.
- the surface of a laminated coating film with “” is scratched with the naked eye or a magnifying glass, spots of a color different from the surrounding colors are observed.
- the “color unevenness” in the present invention means that when the lower layer portion penetrating into the upper layer approaches the surface of the upper layer, the film thickness of the upper layer is relatively reduced and the surface of the coating film is viewed. This is a coating defect observed as spots of a color different from the surrounding color.
- the thickness of the entire coating film increases. Specifically, the thickness of the coated film after drying is 15 m or more. It was found that color unevenness is likely to occur when coated steel sheets are manufactured by multilayer simultaneous coating.
- the color unevenness phenomenon in the simultaneous multilayer coating is different from the conventional mottled phenomenon in the single layer, but it is a phenomenon that occurs in the heating furnace, so the convection in the paint film may have an effect. Considering that there is a problem, we started to study from the side of suppressing convection.
- bannered cell convection in a single layer is that the solvent is volatilized non-uniformly from the paint film surface, the surface tension and viscosity of that part increases, and this tends to cause downward flow in that part. This is a convection phenomenon. This phenomenon is also known as Marangoni convection. It is known that bannered cells can be suppressed by adding non-uniform evaporation of the solvent from the coating film and suppressing convection by adding a leveler, which is a kind of surface conditioning agent, to the coating.
- the inventors of the present invention made color irregularity in that the precoat steel sheet was produced by adding a leveler to the upper layer paint among the paints to be coated simultaneously in multiple layers, and the leveler was not added to the upper layer paint. The degree was compared. As a result, when the leveler is added to the upper layer, the leveler is not added to the upper layer. Although the degree of color unevenness is improved compared to the above, it has been found that the occurrence of the unevenness varies.
- the present inventors examined whether color unevenness can be prevented by adjusting the surface tension of the upper and lower paints under the condition that the leveler is added to the upper paint. As a result, it was found that color unevenness can be prevented by adjusting the difference in surface tension between the upper layer paint and the lower layer paint within a certain range.
- the upper layer coating will not spread over the lower layer coating. It is thought that the force that the upper layer paint wets and spreads works to suppress the force that disturbs the interface between the upper and lower layers due to Marangoni convection and widens the interface.
- the effect of suppressing color unevenness by adding a leveler as a surface conditioner to the upper layer of the multilayer paint film is due to the uniform reduction of the surface tension of the upper layer and suppression of non-uniform evaporation of the solvent. Conceivable. As a result, this is thought to be similar to the effect of suppressing bannered cell convection in conventional single-layer paint films. Furthermore, as a new effect, reducing the surface tension of the upper layer paint uniformly promotes the uniform spread of the upper layer paint on the lower layer paint, thus disturbing the interface between the upper layer and the lower layer. It is thought to work in a direction that uniformly suppresses the force to widen the interface.
- the present inventors can reduce the difference between the surface tension of the upper layer and the surface tension of the lower layer when the surface tension of the upper layer is lower than the surface tension of the lower layer. We found that there are conditions that do not cause uneven color. This phenomenon makes it easier for the lower layer paint to spread on the lower layer (another coating layer formed together with the multi-layer simultaneous coating, or the original steel plate or the primer layer above it). It was speculated that the phenomenon of rising was suppressed.
- This surface tension can be adjusted using a leveler, which is a kind of surfactant.
- surfactants include levelers and antifoaming agents, and in particular, antifoaming agents are used to release bubbles in paint.
- the material used for adjusting the surface tension in the present invention belongs to a class called a leveler used to improve the smoothness of the coating film. Among them, the following determination is performed. The appropriate leveler selected was used. Appropriate levelers and their addition amount are simply, a single layer of paint with a sufficient amount of leveler added to adjust the surface tension of the coating, and a substrate with sufficient wettability (no leveler added) When the paint is applied, it can be judged by whether or not the skin-like repellency occurs in the wet state when the paint layer is applied on the wet substrate. A leveler that does not generate a cigar-like repellency can be determined as an appropriate leveler that can be used in the present invention.
- Levelers that can actually be used include acrylic levelers, There is a reckoner leveler. For example, as non-silicone
- Homogenol L 1 8, Homogenol L 9 5, Homogenol L 1 8 2 0 (Kaosha), B YK 0 5 7, BYK 0 5 1, BYK 0 5 2, B ⁇ 0 5 3, ⁇ ⁇ 0 5 5, 7 ⁇ 7 0 7 7 ( ⁇ ⁇ —Chemie Co., Ltd.) is a silicone type homogenol L 1 0 0 (Kao Corporation), B YK 0 8 0, B YK 1 4 1, B YK 0 6 5, BYK 0 6 6, ⁇ ⁇ 0 70, ⁇ ⁇ ⁇ 0 8 8 ( ⁇ ⁇ -Chemie).
- the leveler in the coating film of the product pleco-coated steel sheet manufactured by multi-layer simultaneous coating peels off the coating film of the product, extracts unreacted polymer in the solvent, and heats and concentrates the solvent after extraction. Later, it can be detected by infrared absorption spectrometry.
- the color unevenness score was expressed as 5 when there was no color unevenness visually, and when the color unevenness occurred so that the color unevenness could be sufficiently confirmed by visual inspection, and was ranked according to the degree of color unevenness. . For example, grade 4 does not show clear color irregularities, but it can be seen with a 10X magnifier.
- Figure 1 shows the effect on color unevenness when a leveler is not included in the lower layer and a leveler is not included in the upper layer. ) On the horizontal axis, and the color shading score on the vertical axis, showing the relationship between the two.
- the first cause of color unevenness is that the difference in surface tension between the lower layer and the upper layer is less than 1.2 m NZ m, but another factor is the decrease in viscosity. Is considered to affect the color unevenness. In this case, the viscosity measured in the upper cup was 37 s.
- the color unevenness score was 4 points when the viscosity of the upper layer was 59 seconds. From this fact, it can be said that the higher the viscosity of the upper layer, the color unevenness is suppressed and 60 seconds or more is preferable. In addition, the higher the viscosity of the lower layer, the more uneven color tends to be suppressed.
- the coating of each layer used for the simultaneous multilayer coating when the surface tension is measured 5 times, the difference between the maximum value and the minimum value is It is important to use paints that are less than 2 m NZ m. This is due to the following reason.
- the paint used must be a paint with a uniform surface tension.
- a paint layer formed with a paint that produces micro-uniformity in surface tension exhibits a yuzu-skin-like appearance as a result of the induced fine convection phenomenon. Whether or not such a skin-like appearance is reached can be easily determined by the appearance when the coating material is applied on the substrate as a single layer (as described above). Has a skin-like appearance).
- the inventors have found that the dispersion of values when the surface tension is measured multiple times is useful as a criterion for quantitatively determining this. That is, when the surface tension was measured 5 times and the difference between the maximum and minimum values was less than 2 mN / m, it was found that the paint could be considered sufficiently microscopically uniform. .
- the cross section of the pre-coated steel sheet of the present invention produced by multilayer simultaneous coating is observed at a magnification of 500 times, as schematically shown in FIG. 3A, the lower coating layer 10 1 and the upper coating layer 1 0 3 Waviness is observed at the interface 10 5.
- 'swell pitch (distance P in the figure) is about 0.5 to 1 mm.
- the coating layer interface 105 is observed at a higher magnification of 500.000 times, as schematically shown in FIG. 3B corresponding to an enlarged view of the portion indicated by B in FIG. Fine irregularities are observed.
- Figures 4A and 4B show scans of the cross section perpendicular to the surface of the coated film that was cut and embedded in resin and then polished and smoothed, respectively. It is a type
- the coated steel sheet is cut, embedded in resin, and then polished, so that the cross section perpendicular to the surface of the coating film is smoothed, and after taking a picture with a scanning microscope at 500.times. Ra can be obtained.
- the Ra of the interface is the area of the vertical line as shown in Figure 5 after covering the photograph with a transparent sheet used for ⁇ HP and tracing the unevenness of the interface precisely. Is measured by an image processing apparatus, and the average value can be obtained from the following equation.
- 1 in the formula is the measured length in the direction of the center line shown in FIG.
- the unevenness of the interface of the coating layer formed by multi-layer simultaneous coating Examination shows that the value of the center line average roughness Ra is generally 0.3 im or more, at least about 0.25 X m, and the upper limit is generally about 0.7 x m. It turns out that there is. This relationship is also recognized in the case of three or more coating films formed by simultaneous simultaneous multi-layering. In this case, the center line average observed at a high magnification of 500.000 times at the interface between two adjacent layers. Roughness Ra was generally 0.3 m or more, and at least about 0.25 m, and the upper limit was generally about 0.7 // m.
- the interfacial; a is about 0.15 to 0.25 zm, and it is 5 0 0 0 times From the photomicrograph, the difference from the coating layer according to the present invention was clear.
- the thickness t expressed as the distance to the upper surface of the upper layer is taken as the average film thickness of the upper layer.
- the thickness expressed as the distance from the lower surface of the lower layer to the center line of the interface with the upper layer is defined as the average thickness of the lower layer.
- the average film thickness of the intermediate layer excluding the uppermost layer and the lowermost layer when the coating film formed by multilayer simultaneous coating is composed of three or more layers is the center line of the interface with the upper and lower layers that are both wavy. It is calculated as the distance between.
- the lower layer 1 0 1 contains the pigment 1 0 7 and part of the pigment 1 0 7 exists in the part of the ridge 1 1 5 of the wavy interface 1 0 5,
- the upper part of the pigment 1 0 7 may contact the interface 1 1 1, or may protrude from the interface 1 1 1 to the upper layer 1 0 3.
- the maximum height H when the pigment 10 7 protrudes from the interface 1 1 1 is determined by regarding the contour 1 0 7 a of the portion protruding from the interface 1 1 1 of the pigment 1 0 7 as the interface.
- the condition for obtaining a rating of 5 by preventing color unevenness is that the difference in surface tension between the lower layer and the upper layer is 1.2 mNZm or more when the leveler is inserted only in the upper layer, the upper layer and the lower layer When the leveler is added to the slag, it is 0.3 mN / m or more.
- the coating film of the precoated metal sheet of the present invention is formed using a multilayer simultaneous coating apparatus.
- Figure 7 shows a schematic perspective view of a slide hopper curtain coating device, which is a typical example of such a device.
- the laminated paint is spread by the curtain guide 3 when falling from the tip of the slide surface 7 (the lip 7 A) to the paint pan 5, so that a uniform liquid is applied in the width direction as the paint curtain 4. It flows down as a membrane. Banded metal on this liquid film By passing a plate, for example, steel strip 2, multiple layers of paint can be applied simultaneously on the surface of steel strip 2.
- the paint film has a multi-layered force of 4
- the total film thickness of the curtain 4 is more than the stable film thickness, that is, if the dry film thickness is about 20 / m, the paint film thickness of one layer It is possible to paint even a few meters. Therefore, by coating the lower layer coating film and the upper layer coating film at the same time, it is possible to obtain a coated metal plate having a beautiful appearance without occurrence of mouth-bing.
- the upper paint film becomes smooth. This is because when the surface tension of the upper layer paint is lower than that of the lower layer paint, the lower layer paint is restrained by the metal plate surface, so that the outermost paint is smoother hydrodynamically. This is to stabilize.
- any paint can be used as long as the above conditions are satisfied.
- a polyester resin can be suitably used as the resin component for forming the coating film.
- the lower layer coating material may contain various components commonly used in coating compositions.
- a known curing agent such as melamine resin or isocyanate can be used.
- the lower layer paint may contain extender pigments, aggregates, and the like as necessary.
- Hydrocarbon, Anon Z Solvesso (a 1: 1 mixed solvent of cyclohexanone (commonly known as Anon) and Solvesso 1550), etc. can be used as the coating solvent. .
- the upper layer paint is still a polyester as a resin component that forms a coating film.
- a steal resin can be used.
- a resin component such as fluorine, acrylic, silicone polyester, urethane, or epoxy may be used.
- the upper layer coating material can also contain a known curing agent such as a melamine resin type or an isocyanate type in addition to the polyester resin of the main resin.
- extender pigments, antifoaming agents, waxes and the like may be included as necessary.
- a hydrocarbon solvent is generally used.
- any pigment selected from known colored pigments can be used.
- coloring pigments examples include organic pigments such as azo yellow, isoindolinone yellow, azo red, phthalocyanine blue, selenium amber, quinacridone red, etc. Also represented by carbon black, petal, yellow lead, molybdenum orange, titanium white, ultramarine blue, bituminous (Prussian blue), titanium yellow, graphite (graphite), zinc white, etc. Inorganic pigments, etc.
- a hot air furnace, an induction heating furnace, a near infrared furnace, a far infrared furnace, or an energy beam curing furnace can be used for drying and baking the paint.
- the baking temperature of the paint is preferably 150 ° C. or more and less than 3 20 ° C.
- the upper layer of the coating layer is a transparent or translucent clear layer, and the lower coating layer adjacent to the upper clear layer.
- the center line average roughness Ra of the interface between the upper layer and the upper clear layer is 0.3 to 0.7 mm.
- the Ra of this interface is more preferably 0.3 to 0.5 m in order to give a solid appearance.
- the surface Ra can be adjusted by controlling the difference in the surface tension between the lower layer and the upper layer using a leveler (a kind of surfactant).
- the levelers that can be used for this are as described above.
- the surface tension of the lower layer is larger than the surface tension of the upper layer, so that the upper layer paint tends to spread on the lower layer paint. It is thought that the force to disturb the interface and widen the interface is suppressed, and the abnormal disturbance of the interface due to the coating of the upper and lower coating films remaining in a liquid state can be suppressed.
- the difference in surface tension between the lower layer and the upper layer is obtained by adding a leveler only to the upper layer. Should be less than 5 mN / m, and less than 3.7 mNZm when levelers are inserted in the upper and lower layers.
- the surface tension and Ra of the interface can be measured by the method described above.
- the top clear type pre-coated metal sheet of the present invention provides the upper clear layer with a color, pattern, design, etc. so that the color, pattern, design, etc. of the undercoat can be seen. It is a pre-coated metal sheet that has been given a variety of design features by the synergistic effect of the above. To the extent that the lower coating layer can be seen through the upper clear layer (top coating), Since the upper clear layer is transparent, it is called “top clear type”.
- the color, pattern, and design of the lower layer coating are not particularly limited, and may be obtained by applying one of known techniques or a technique combining them. .
- the top clear layer at least the color, pattern, and design of the base must be visible through the top clear layer in order to produce a synergistic effect with the lower layer coating. If this condition is satisfied, the top clear layer can be provided with color, glazing and design by applying known techniques such as pigments, dyes, aggregates and matting agents. That is, the top clear layer only needs to have transparency to the extent that the color of the lower layer coating film is substantially reflected in the appearance of the painted metal plate (that is, it may be in a translucent state).
- a coating layer can be formed on the top clear layer in order to protect the top layer or to aim at a synergistic effect due to the multilayer. In this case as well, it is necessary to see the lower layer through the additional layers.
- the base metal plate is a steel plate
- a stainless steel plate and a mated steel plate can be suitably used in the top-que type pleco type metal plate of the present invention.
- the stainless steel plate include a Ferei stainless steel plate, a martensitic stainless steel plate, and an austenite stainless steel plate.
- galvanized steel sheet galvanized steel sheet, Steel plate with lead-ferrous alloy, steel plate with zinc-nickel alloy, steel plate with zinc-chromium alloy, steel plate with zinc-aluminum alloy, steel plate with aluminum two-muor alloy, zinc-aluminum-one alloy alloy Steel plate, zinc-aluminum-magnesium-silicon alloy-plated steel plate, zinc-plated stainless steel plate, aluminum-plated stainless steel plate.
- pre-painting of steel sheets there are washing with water, washing with hot water, pickling, alkali degreasing, grinding, polishing, etc., and these can be performed alone or in combination as required. Appropriate selection of pre-painting treatment
- the upper clear layer is a transparent or translucent clear layer.
- the coating material for forming the upper layer is not particularly limited.
- polyester, acryl, silicone, fluorine, urethane, polyolefin, or a mixture or copolymer thereof can be suitably used.
- the coating material for the upper clear layer may contain a known material such as an amino resin, a isocyanate resin, or an epoxy resin as a crosslinking agent, if necessary. Further, as described above, a colorant such as a pigment may be contained within a range where the lower layer can be seen.
- the paint for the upper clear layer is a giant that gives design to the extent that its clarity is not impaired, pearl, y force, metal powder (aluminum,. Rubber powder, nickel powder, stainless steel powder, etc.), organic enamel beads (urethane resin beads, acrylic resin beads, etc.), coloring pigments and dyes may be added.
- the coating film to be formed on the metal plate includes at least the above-described transparent or translucent upper clear layer and a lower coating film adjacent to the upper clear layer. If necessary, a layer other than the upper clear layer and the lower layer coating (for example, a layer between the lower layer coating and the metal plate) can be included.
- the coating material for forming the lower layer coating film is not particularly limited.
- polyester, acrylic, silicone, fluorine, urethane, polyolefin, or a mixture or copolymer thereof can be suitably used.
- the coating material may contain a known material such as an amino resin, an isocyanate resin, or an epoxy resin as a cross-linking agent.
- the lower layer coating film preferably contains a colorant such as a pigment (for example, When there is another coating between the lower layer coating and the metal plate).
- additives for imparting functions such as lubricity and stain resistance, additives for improving coating workability and dispersion stability of pigments, etc., ultraviolet rays for improving ultraviolet resistance
- additives for imparting functions such as lubricity and stain resistance, additives for improving coating workability and dispersion stability of pigments, etc.
- ultraviolet rays for improving ultraviolet resistance Additives such as absorbents and antioxidants, and other components can be added to the lower layer.
- an “enamel base coat” which is one embodiment of the lower layer coating film in the present invention, a commonly used enamel base coat or pre-coated steel sheet can be applied as it is.
- polyester resin base scor Acrylic resin base coat, silicone polyester resin base coat, PET resin base coat, urethane resin base coat, polyvinyl chloride resin base coat, fluorine resin base coat, etc.
- the same resin used in the clear paint of the present invention can be applied to the base coat paint. That is, one or both of a polymerizable ultraviolet ray-stable monomer and a sill alkyl group-containing polymerizable monomer and a polymerizable monomer component essentially containing a hydroxyl group-containing polymerizable monomer are copolymerized.
- the top clear type pre-coated metal sheet of the present invention uses a multi-layer simultaneous coating device on at least one side of the metal sheet to form a lower coating layer (for example, enamel base coat) and a coating layer of a clear coating.
- a lower coating layer for example, enamel base coat
- a coating layer of a clear coating are applied at the same time, followed by drying and baking.
- the paint can be dried and baked using a hot air furnace, induction heating furnace, near infrared furnace, far infrared furnace, or energy ray curing furnace.
- the baking temperature of the paint is 1 5 0 or more 3 2 0 Desirably below ° C.
- the coating film disposed on the surface contains at least the upper clear layer and the lower coating layer, and the center line average roughness Ra of the interface between the upper clear layer and the lower coating layer is 0.3 to 0. As long as it is 7 m, it may have three or more layers. .
- the film thickness of the top clear type precoated metal sheet of the present invention is not particularly limited. That is, the appropriate film thickness may vary depending on the coating film performance and application, and therefore it is preferable to select appropriately as necessary. However, in general, the film thickness of the enamel base coat is preferably about 5 m to 40 m, and the film thickness of the clear coating layer is preferably 1 to 40 m.
- a curing agent for example, melamine resin
- a curing agent for example, melamine resin
- the coating film may contain another curing agent for the coating film. That is, in the present invention, for example, a curable resin and a curing agent can be combined as follows (in the table below, the curing agent for resin A is a and the curing agent for resin B is b And c is a hardener common to resins A and B). Lower layer-containing upper layer-containing curing agent Upper layer clear layer Curing agent
- Resin A curing agent a Resin B curing agent b
- a gradient of the curing agent concentration may exist at least in the vicinity of the interface between the lower coating layer and the upper clear layer. This is preferable from the viewpoint of further improving the adhesion between the layers. This is also preferable because the concentration gradient of the curing agent is present in the vicinity of the interface, so that the refractive index of light in the vicinity of the interface changes and the ratio of irregular reflection at the interface is further increased. .
- the pre-coated metal plate having both workability and corrosion resistance according to the present invention has a lower layer coating film formed on the metal plate by multilayer simultaneous coating and an upper layer coating film thereon, and the lower layer coating film has an average of 30% by mass.
- the above-mentioned anti-glare pigment is contained, and the upper layer coating film has the same anti-fouling pigment as that in the lower layer coating film at an average content lower than the average content of the lower layer coating film and from the vicinity of the interface with the lower layer coating film It is contained in a concentration gradient that gradually decreases as it moves away, and the center line average roughness Ra of the interface between the lower layer coating film and the upper layer coating film is 0.3 to 0.7.
- the paint that forms the lower coating film of the precoated steel sheet contains a resin component that forms the coating film and an anti-fouling pigment that is effective in suppressing corrosion of the steel sheet.
- a resin component for forming the coating film a polyester resin can be preferably used.
- the coating of the lower layer coating film can contain various components generally used in coating compositions. For example, a known curing agent such as melamine resin or isocyanate can be used.
- the paint of the lower layer coating contains extender pigment, aggregate, if necessary
- titanium white may be included as a coloring pigment.
- Hydrocarbon, Anon Z Solvesso (a 1: 1 mixed solvent of cyclohexanone (commonly known as Anon) and Solvesso 1550), etc.
- the blending ratio of the main resin and other components can be determined as appropriate depending on the coating conditions of the paint and the requirements of the coating film to be formed. For example, when a melamine resin-based one is used as the curing agent, it is possible to use 5 to 40 parts by mass of the curing agent with respect to 100 parts by mass of the main resin. Further, 50 to 200 parts by mass of the solvent and 20 to 100 parts by mass of the antifungal pigment can be used with respect to 100 parts by mass of the main resin.
- anti-fouling pigment contained in the lower coating film of the precoated steel sheet according to the present invention are chromite compounds such as strontium chromate and normochromate, or calcium silicate and phosphate compounds. Such as non-chromium antibacterial pigments.
- the same polyester resin as described above for the coating material for forming the lower coating film can be used as the resin component for forming the coating film.
- a resin component such as fluorine, acryl, silicone polyester, urethane, or epoxy may be used.
- the paint for forming the upper coating film can also contain a known curing agent such as melamine resin or isocyanate, in addition to the polyester resin as the main resin.
- the paint for the upper layer coating film may contain extender pigments, antifoaming agents, leveler additives, waxes and the like as required.
- a hydrocarbon solvent is used in the upper coating film.
- the mixing ratio of the main resin and other components can be appropriately determined depending on the coating conditions of the paint and the requirements of the coating film to be formed. For example, when a melamine resin-based curing agent is used, 5 to 100 parts by mass of 100 parts by mass of the main resin Curing agents can be used. Further, 50 to 200 parts by mass of the solvent and 0.5 to 5 parts by mass of the wax can be used for 100 parts of the main resin.
- an average of 30% by weight or more of the anti-glare pigment is present in the lower layer coating, and the anti-glare pigment in the lower layer coating
- the same anti-bacterial pigment is present with an average content lower than the average content of the lower layer coating film and with a concentration gradient that gradually decreases as the distance from the vicinity of the interface with the lower layer coating film increases.
- Antifouling pigments in the upper coating should be present mainly near the interface with the lower coating and should not be detected on the surface of the upper coating. If anti-glare pigments are present on the outermost layer of the painted metal plate, the stain resistance, processability, appearance and color tone will deteriorate.
- the lower layer coating film and the upper layer coating film in the pre-coated metal sheet that achieve both workability and corrosion resistance according to the present invention are the target averages in the lower layer of the finished painted metal sheet in the coating for the lower layer formed on the metal sheet.
- the anti-glare pigment in the lower layer is added to the upper layer by heating at the time of baking after coating the lower layer paint film and the upper layer paint film on the metal plate. It can be formed by diffusing into it.
- the amount of anti-glare pigment to be initially included in the lower layer paint can be easily determined through experiments based on the target anti-fouling pigment content in the lower layer of the pre-coated metal sheet, baking conditions, etc. .
- the average content of the antifungal pigment in the lower coating film of the precoated metal sheet is at least 30% by mass. 30% by mass or less Pre-coating The corrosion resistance of the metal plate is not sufficient. Preferably, the average content of the anti-glare pigment in the lower coating film is 50% by mass or more.
- Antibacterial pigment undercoat When it is contained in the film, the upper limit of the content of the antifungal pigment is usually about 40% by mass. The reason is that the effect is saturated even if the anti-glare pigment is increased further, and if the amount of the anti-glare pigment is increased, the soot layer coating film becomes brittle, and improvement in corrosion resistance cannot be expected. .
- the pleco-coordinated metal plate of the present invention due to the effect of continuity of the hardness distribution in the thickness direction of the coating film, which will be described later, depending on the content of the anti-glare pigment in the lower coating film, Even if the film becomes brittle, the corrosion resistance can be increased.
- the center line average roughness Ra of the interface between the upper layer coating film and the lower layer coating film may be 0.3 to 0.7 xm. It is important (measurement of Ra is as explained earlier). By setting the Ra of the interface within this range, the adhesion between the upper layer coating film and the lower layer coating film can be secured, and the processability of the coating film can be improved. If the Ra at the interface is less than 0.3 m, the adhesion between the upper coating film and the lower coating film is insufficient, and the workability of the coating film may be impaired.
- the upper limit of 0 is the upper limit of Ra that is normally observed in adjacent layers coated simultaneously with multiple layers.
- the center line average roughness R a within the above range of the interface between the upper layer coating film and the lower layer coating film uses a co-intensity capable of simultaneously forming two or more layers such as a slide co-incubator. Then, it can be obtained by using a method in which the coating films of the upper layer and the lower layer are applied simultaneously on the metal plate and then baked at the same time. Since the sliding surface where the paint discharge port is located is separated from the metal plate as the coating zone, the coating film is not easily affected by the discharge flow of the paint, and the coating in the width direction is applied. The film layer thickness and Ra state can be kept uniform. As described above, Ra at the coating film interface can be controlled by utilizing the difference in the surface tension of the paints forming the upper and lower coating films.
- the pre-coating metal plate of the present invention having both processability and corrosion resistance includes a lower coating layer containing an anti-fouling pigment applied to the surface of the metal plate using a multilayer simultaneous coating apparatus,
- a paint film consisting of the upper paint layer a part of the anti-glare pigment in the lower paint layer is diffused into the upper paint layer, and the average anti-glare pigment concentration in the lower layer formed by baking is 30% by mass or more, and the concentration of the same antifouling pigment as that of the lower layer in the upper layer is lower than the average content of the lower layer, and gradually decreases as the distance from the interface with the lower layer increases.
- Roughness Ra is a method to make it 0.3 ⁇ 0.7 m Ri can be produced.
- a salt spray test SST
- a sample with poor corrosion resistance is shown in Fig. 8, as shown in Fig. 8.
- the upper layer coating is applied in a region about 1 mm wide from the line 1 3a along the line 1 3 cross-cut in the head portion 13 and in a region about 5 mm wide from the end surface along the end surface. Bulging due to salt water entering the interface between the membrane and the lower layer coating is observed. The appearance of such swelling is thought to be due to the following mechanism.
- the lower layer coating film 2 2 and the upper layer coating film 2 3 in the cross-cut portion, and the lower skin coating film 3 2 and the upper layer coating film 3 3 at the end face also return to the original state without distortion.
- the adhesion between the lower coatings 2 2 and 3 2 and the upper coatings 2 3 and 3 3 is good, salt water is unlikely to enter the interface between the two layers, and corrosion resistance is ensured.
- salt water penetrates into the interface and causes blistering of the coating, that is, insufficient corrosion resistance of the precoated metal sheet is exhibited.
- the presence of a relatively high content of anti-glare pigment of 30% by mass or more in the lower layer coating film ensures the expression of corrosion resistance by the lower layer coating film.
- the anti-glare pigment diffused from the lower coating film in the upper coating film is also present in the upper coating film with an appropriate concentration gradient, and the center line average roughness R of the interface between the lower coating film and the upper coating film is R.
- a is 0.3 to 0.7 im so that the adhesion between the upper layer coating film and the lower layer coating film is improved, thereby ensuring the workability of the metal plate, and the upper layer coating film and the lower layer coating film This prevents a decrease in corrosion resistance due to the penetration of moisture into the interface.
- a two-layer coating film of a pre-coated metal sheet is formed so that the upper layer is hard and the lower layer is soft. If the same anti-bacterial pigment as the lower layer is present in the upper layer of the coating film formed by baking the two applied paints together, the hardness distribution in the thickness direction of the coating film is continuous. (Or almost continuous). As a result, it is inherently soft, and since it is brittle due to the inclusion of the anti-glare pigment, cracks that occur during the processing of the metal plate are reduced in the lower layer where cracks are likely to occur. Therefore, sufficient corrosion resistance can be obtained even if the anti-fading material is increased and the lower layer becomes more brittle.
- the adhesiveness between the upper coating film and the lower coating film is further adjusted so that the center line average roughness Ra of the interface between the lower coating film and the upper coating film is 0.3 to 0.7 m. This also contributes to ensuring corrosion resistance.
- the method for baking the applied multi-layer coating film is not particularly limited, and for example, hot air, induction heating, or the like can be used, and a plurality of methods may be used in combination.
- a radiation curable coating layer radiation irradiation can be used in combination.
- the coating layer may be naturally dried, although it is not as preferable as baking by forced heating. In the case of heating, it is common to raise the metal plate temperature to 40 to 25 ° C.
- a suitable thickness of the upper coating film is 10 to 30 / zm in average thickness. If the thickness is less than 10 xm, the stain resistance cannot be sufficiently secured, and if it is thicker than 30 / xm, the economy is inferior and the workability may be lowered. A more preferable thickness of the upper coating film is 12 to 20 m.
- the thickness of the lower coating film may be appropriately determined from the workability and, depending on the case, corrosion resistance and other properties, but generally a suitable film thickness is 2 to 15 ⁇ m. If it is thinner than 2 m, the corrosion resistance is inferior, and if it is thicker than 15 m, the economy is inferior and the workability may be lowered. A more preferable thickness of the lower coating film is 5 to 10 m.
- the above-described method using an enlarged photograph of the cross section can be used. Any other known method may be used. For convenience, it is possible to use the gravimetric method (although it is necessary to form and measure the lower layer coating and the upper layer coating separately).
- the present invention was applied when curtain coating a multilayer film on a steel strip.
- the steel strip wound around the coil is unwound by an uncoiler 41 and passed through an accumulator 4 2, a chemical conversion treatment device 4 7, a prime converter 4 5, and an induction heating furnace 4 3.
- a slide-type slide hopper type force-strength coating device 4 9 is placed at the subsequent position, and a multilayer film is curtain-coated on the surface of the running steel plate 11.
- An induction heating furnace 5 1 is provided downstream of the curtain coating device 4 9 as a facility for drying and baking the applied paint. After that, the steel sheet is wound up by the recoiler 4 4 as a steel strip that has been processed through the accumulator overnight 53.
- the slide hopper type force-tensile coating equipment 4 9 applied two layers simultaneously.
- the size of the slide hopper type curtain coating equipment is as follows: slit width on the coat is 20 mm, slit spacing is 500 m, and height to the coated steel sheet is 150 mm. It was.
- the steel sheet moved under the multi-layer slide, and a multilayer coating film was formed on the steel sheet.
- drying and baking were performed in an induction heating furnace.
- the thickness of the coating film was 2 to 15 mm for the lower layer and 0.5 to 15 mm for the upper layer.
- the heating rate in the induction heating furnace was 2 to 10 ° C Z s, and the ultimate temperature of the steel plate after baking was 2200 to 2300 ° C.
- Paint 1 High molecular polyester / isocyanate
- Paint 2 High molecular polyester / melamine Paint 3: Polymer polyester / melamine
- Red pigment Iron oxide pigment
- Gray metallic pigment Prepared by adding flat aluminum particles (major axis: about 20 im) after toning with various pigments to gray.
- Clear metallic pigment Prepared by adding flat aluminum particles (major axis: about 20 m) to a clear paint.
- Leveler A Arc-U leveler (manufactured by Nippon Paint Co., Ltd.)
- Leveler B Silica ⁇ -based additive B Y K 1 4 1 (BY K-Chemie e)
- the average film thickness of each layer and the centerline average roughness Ra of the interface are obtained by using a transparent sheet used for HP on a scanning micrograph of 500,000 times the cross section of the coating film. Measurements were made using the interface curve obtained by overlay tracing. Furthermore, measured from the center line of the layer located above the interface with the maximum height from the center line of the swell of the interface observed at a magnification of 500 times. The ratio to the measured thickness was obtained as the interface waviness%.
- the color unevenness score is rated 5 when there is no color unevenness by visual inspection, and when the color unevenness is sufficiently confirmed by visual inspection, and is ranked according to the degree of color unevenness. Expressed. For example, grade 4 does not show clear color unevenness, but it can be confirmed by looking at a 10x level.
- the adhesion between the coating layers was evaluated by a coin scratch test. When a 1,000 yen coin is pressed against the painted surface of each steel plate and pulled, and scratches that reach the original plate are made, peeling occurs at the interface between the two layers of the coating at both ends of the scratch. Those that did not occur were evaluated as good.
- the processing heating adhesion between the coating layers was evaluated by the following method. Each steel plate is squeezed into a cylindrical cup so that the evaluation surface is outside with a squeezing ratio of 2.0, a pressing pressure of 1.0 ton, and then the cup is heated in a hot air oven at 120 ° C for 20 minutes. The sample was heated and taken out, and after cooling, the paint appearance on the side of the cup was observed. . Evaluated as unsatisfactory and unsatisfactory when the film peeled or cracked.
- Tables 1 and 2 show the experimental results. These tables list only examples with primers, but the results were the same without primers.
- Example 5 0. 49 7 Good Good Good Example 5 0. 42 3 Good Good Example 5 0. 57 5 Good Good Example 5 0.51 Good Good Good Example 5 0.558 5 Good Good Example 5 0. 70 7 Good Good Comparative Example 1 0. 52 100 Good Good Comparative Example 3 0. 42 55 Good Good Comparative Example 3 0. 57 60 Good Good Comparative Example 2 0. 51 80 Good Good Comparative Example 2 0. 58 100 Good Good Comparative Example 1 0. 70 100 Good Good Example 5 0. 64 7-Good Good Example 5 0. 43 3 Good Good Example 5 0. 35 5 Good Good Example 5 0. 69 3 Good Good Example 5 0. 54 5 Good Good Example 5 0. 56 5 Good Good Example 5 0. 30 10 Good Good Example S 0. 25 30 Good Good Example 5 0. 12 40 Good Good Example 5 0. 43 7 Good Good Example Example 5 0. 63 3 Good Good Example 5 0. 56 5 Good Good Example 5 0.
- Example 5 47 3 Good Good Good Example 5 0. 47 5 Good Good Example 5 0. 67 5 Good Good Example • 5 0. 35 10 Good Good Example 5 0. 21 35 Good Good Example 5 0. 15 45 Good Good Example 5 0. 58 7 Good Good Example 5 0. 49 3 Good Good Example 5 0. 60 5 Good Good Example 5 0. 50 3 Good Good Example 5 0 30 5 Good Good Example 5 0. 39 5 Good Good Example 5 0. 37 7 Good Good Example 5 0. 38, 10 Good Good Example 5 0. 34 7 Good Good Example 5 0. 60 7 Good Good Good Example 5 0. 66 7 Good Good Example 5 0. 61 10 Good Good Example 5 0. 57 7 Good Good Example 5 0. 57 7 Good Good Example 5 0.552 7 Good Good Table 2 (2/2)
- Example 5 0.51 0 Good Good Good Example 5 0.69 0 Good Good Example 5 0.65 7 Good Good Good Example 5 0.37 • 7 Good Good Comparative Example 4 0.61 65 Good Good Comparative Example 2 0.35 100 Good Good Comparative Example 4 0.52 55 Good Good Comparative Example 4 0.67 50 Good Good Comparative Example 4 0.37 55 Good Good Comparative Example 4 0.41 60 Good Good Comparative Example 4 0.49 65 Good Good Comparative Example 4 0.51 100 Good Good Comparative Example 4 0.70 50-Good Good Comparative Example 4 0.58 55 Good Good Good Comparative Example 4 0.30 50 Good Good Good Comparative Example 4 0.36 55 Good Good Good Comparative Example 4 0.43 55 Good Good Comparative Example 4 0.51 70 Good Good Good Comparative Example 4 0.45 60 Good Good Comparative Example .3 0.69 90 Good Good Comparative Example 2 0.64 100 Good Good Comparative Example 1 0.33 100 Good Good Good Example 5 0.28 3 Defect Bad Example 5 0.29 3 Defect + Defect Example 5 0.48 3 Good Good Comparative Example 2 0.55 100 Good Good Good Example 5 0.48 3 Good Good Good Example 5 0.47 3 Good Good Example
- Example 2 In the same manner as in Example 1, three layers were simultaneously coated on the steel strip.
- the paints, pigments and levelers used were as described in Example 1. 'table
- Quantitative coatings for the lower coating layer and the upper clear layer were prepared in the quantitative ratios shown in Table 5. Specifically, the individual polyester resins shown in Examples 3 A to 3 in Table 5 were dissolved in the organic solvent cyclohexanone Z Solpets (trade name of Exxon Chemical Co., Ltd.) 150.
- these paints are treated with melamine resin (methylated melamine (trade name: Cymel 300, manufactured by Mitsui Cytec)) or isocyanate curing agent (Desmodur BL 3 1 7 5, Mitsui (Cyanamide Co., Ltd.) is added, and if necessary, a catalyst (trade name: CARYLIST 6 00 0, Mitsui Cytec Co., Ltd.) or TK 1 (Takeda Pharmaceutical Co., Ltd.) is added and stirred. To get paint.
- melamine resin methylated melamine (trade name: Cymel 300, manufactured by Mitsui Cytec)
- isocyanate curing agent Desmodur BL 3 1 7 5, Mitsui (Cyanamide Co., Ltd.)
- a catalyst trade name: CARYLIST 6 00 0, Mitsui Cytec Co., Ltd.
- TK 1 Takeda Pharmaceutical Co., Ltd.
- the lower layer paint has a leveler B YK 1 4 1 (B. YK—Chemie) 0. lwt%, and the upper layer paint has an acrylic leveler 1 (manufactured by Japan Pain Co.). 3 wt% was added.
- the surface tension was measured with Dynomé (by BYK—Chemie GmbH). Degreased 0.8 mm thick hot-dip galvanized steel sheet coated on both sides with an adhesion amount of 60 g / m 2 per side. It was degreased by immersing it in a treatment agent (manufactured by Nippon Pariki Rising Co., Ltd.), washed with water, and dried.
- a chromate-free pretreatment agent (E 30 QN, manufactured by Nihon Parkerizing Co., Ltd.) on the degreased hot-dip galvanized steel sheet using a roll coater so that the ultimate plate temperature is 60 °. And dried with hot air.
- the coating films shown in Table 5 were formed on the molten zinc-plated steel plate after the chromate-free pretreatment by simultaneous application using a slide hopper type curtain coating device. These layers are baked at the same time (maximum plate temperature (P MT) 2 35 ° C, 1 minute), and on the hot-dip galvanized steel sheet, the lower coating layer (thickness 15 / m) and the upper layer Clear layer (thickness 1 0 xm or 1 m).
- a resin layer for forming the lower coating layer is formed on the hot-dip galvanized steel sheet after the same chromate-free pretreatment as used in Example 3, using a roll coater, and PMT 2 15 ° C, hot air drying was performed for 45 seconds. Next, a resin layer for the upper layer coating layer was formed using a mouth coater and dried at PMT 2 35 ° C. for 1 minute.
- the characteristics of the coated metal sheets obtained in IV, 3 and 4 were evaluated.
- the Ra of the interface was evaluated by the method described above.
- a 1 mm square grid was put on the coating film with a cutter knife, and a peel test was conducted with a commercially available adhesive tape (Cero Tape (registered trademark)) to evaluate the adhesion of the coating film.
- the coating film with no remarkable abnormality in the appearance was evaluated as “good” adhesion, and the coating film with delamination was evaluated as “adhesion”.
- Example 4 Comparative Example
- the occurrence of delamination between the lower coating layer and the upper clear layer was observed after the weather resistance promotion test.
- a hot-dip galvanized steel plate (thickness 0.6 mm, width 200 mm) that has been subjected to non-chromate treatment (E 3 0 0 N, manufactured by Nihon Pariki Rising Co., Ltd.) used.
- the paint for the lower layer was obtained from Nippon Paint Co., Ltd. Polyester (Molecular weight 1 2 0 0 0 0) 100 parts by mass, Curing agent (Melamine resin 20 parts by mass, Epoxy resin 20 parts by mass, or Urethane resin (10 parts by mass), solvent (anone (cyclohexanone) / S 15 50 (Solvesso 15 50)) 1: 1 mass ratio mixed solvent, except for number 7 40% of this mixed solvent was replaced with EEP (Ethyl 3-ethoxypropionate) 1) Paint prepared from 70 parts by mass was used.
- Polyester Molecular weight 1 2 0 0 0 0 0
- Curing agent Melamine resin 20 parts by mass, Epoxy resin 20 parts by mass, or Urethane resin (10 parts by mass)
- solvent anone (cyclohexanone) / S 15 50 (Solvesso 15 50)
- EEP Ethyl 3-ethoxypropionate
- the anti-glare pigments shown in Table 6 were added to the lower layer paint, and the amount was adjusted so that the average amount of anti-glare pigments shown in Table 6 was included in the lower layer formed by baking. Further, 0. l w t% of a leveler (B YK—C Y mie B YK 1 4 1) was added to the lower layer paint.
- the upper layer paint was obtained from Nippon Paint Co., Ltd. Polyester (Molecular weight 1 5 0 0 0) 1 0 0 parts by mass, melamine resin curing agent A paint prepared from 20 parts by mass, 80 parts by mass of a titanium white color pigment, and 200 parts by mass of a 1: 1 solvent ratio of Anone ZS 1550 was used. To the upper layer paint, 0.3 wt% of acrylic leveler (manufactured by Nippon Paint Co., Ltd.) was added.
- the lower layer and upper layer paints were simultaneously applied onto the steel plate by sliding katenko to produce samples that were simultaneously baked at the highest plate temperature (PMT) shown in Table 6 (in the case of simultaneous baking, Table 6 The PMT was shown only in the upper column of the upper layer).
- PMT plate temperature
- the anti-glare pigment diffused from the lower layer was present in the average amount shown in Table 6, but no anti-fungal pigment was detected on the surface layer.
- 2 coat 2 bake (2 'C 2 B) (lower layer and upper layer paints were separately applied and baked by curtain coating) was also prepared.
- Numbers 1, 3, 7, and 8 are comparative examples. Numbers 1, 3, and 8 with 2 coats and 2 bake (2 C 2 ⁇ ) and centerline average roughness Ra of the coating film interface is less than 0.1. 8 also had insufficient corrosion resistance. When the Ra at the interface of the coating film was as large as 0.9, the workability and corrosion resistance were inferior, the distribution of the anti-glare pigment was non-uniform, and some of the surface appeared on the surface, resulting in poor appearance.
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Description
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Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR122016003837A BR122016003837B1 (pt) | 2004-12-08 | 2005-12-05 | chapa metálica pré-revestida do tipo de topo claro |
US11/792,353 US8968881B2 (en) | 2004-12-08 | 2005-12-05 | Precoated metal sheet and method of production of precoated metal sheet |
BRPI0518645A BRPI0518645B8 (pt) | 2004-12-08 | 2005-12-05 | chapa metálica pré-revestida e métodos de produção de chapa metálica pré-revestida |
AU2005312559A AU2005312559B2 (en) | 2004-12-08 | 2005-12-05 | Precoated metal plate and process for producing precoated metal plate |
MX2007006431A MX2007006431A (es) | 2004-12-08 | 2005-12-05 | Lamina metalica pre-recubierta y metodo de produccion de lamina metalica pre-recubierta. |
JP2006546782A JP4954711B2 (ja) | 2004-12-08 | 2005-12-05 | プレコート金属板およびプレコート金属板の製造方法 |
EP05814403A EP1820639A4 (en) | 2004-12-08 | 2005-12-05 | PRE-COATED METAL PLATE AND PRODUCTION PROCESS |
CN2005800422110A CN101072675B (zh) | 2004-12-08 | 2005-12-05 | 预涂金属板和预涂金属板的制造方法 |
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EP (2) | EP2671718A1 (ja) |
JP (1) | JP4954711B2 (ja) |
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BR (2) | BR122016003837B1 (ja) |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008524833A (ja) * | 2004-10-29 | 2008-07-10 | イーストマン コダック カンパニー | 多層パターニングによるコーティング法 |
WO2010114135A1 (ja) * | 2009-03-30 | 2010-10-07 | 新日本製鐵株式会社 | プレコート金属板及びその製造方法 |
WO2010134627A1 (ja) * | 2009-05-21 | 2010-11-25 | 新日本製鐵株式会社 | 多層被覆金属板の製造方法 |
JP4818465B2 (ja) * | 2009-05-21 | 2011-11-16 | 新日本製鐵株式会社 | 多層被覆金属板の製造方法 |
KR101161432B1 (ko) | 2009-05-21 | 2012-07-02 | 신닛뽄세이테쯔 카부시키카이샤 | 다층 피복 금속판의 제조 방법 |
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WO2011034214A1 (ja) * | 2009-09-17 | 2011-03-24 | 新日本製鐵株式会社 | プレコート金属板およびその製造方法 |
JP4818485B2 (ja) * | 2009-09-17 | 2011-11-16 | 新日本製鐵株式会社 | プレコート金属板およびその製造方法 |
CN102497982A (zh) * | 2009-09-17 | 2012-06-13 | 新日本制铁株式会社 | 涂装金属材料及其制造方法 |
JP2020090002A (ja) * | 2018-12-04 | 2020-06-11 | 凸版印刷株式会社 | プリント化粧金属板 |
JP7230471B2 (ja) | 2018-12-04 | 2023-03-01 | 凸版印刷株式会社 | プリント化粧金属板 |
Also Published As
Publication number | Publication date |
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KR101032491B1 (ko) | 2011-05-04 |
MX2007006431A (es) | 2007-10-18 |
BRPI0518645B1 (pt) | 2016-10-11 |
US8968881B2 (en) | 2015-03-03 |
CN101072675A (zh) | 2007-11-14 |
BR122016003837B1 (pt) | 2016-12-27 |
KR20070085858A (ko) | 2007-08-27 |
AU2005312559B2 (en) | 2009-04-23 |
AU2005312559A1 (en) | 2006-06-15 |
KR20100012100A (ko) | 2010-02-05 |
US20080003446A1 (en) | 2008-01-03 |
JP4954711B2 (ja) | 2012-06-20 |
TW200624183A (en) | 2006-07-16 |
KR101082122B1 (ko) | 2011-11-10 |
EP1820639A4 (en) | 2011-04-06 |
BRPI0518645A2 (pt) | 2008-12-02 |
TWI276478B (en) | 2007-03-21 |
EP1820639A1 (en) | 2007-08-22 |
JPWO2006062214A1 (ja) | 2008-06-12 |
MY142456A (en) | 2010-11-30 |
EP2671718A1 (en) | 2013-12-11 |
CN101072675B (zh) | 2013-07-17 |
BRPI0518645B8 (pt) | 2017-03-21 |
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