Surface-treated plated steel sheets and hat joiners

Abstract

To provide a surface-treated plated steel plate capable of producing in a continuous line and excellent in non-adhesiveness to a corking material even when exposed to sun light, and a hat joiner excellent in non-adhesiveness to the corking material even when exposed to sun light.SOLUTION: A surface-treated plated sheet 10 comprises: a plated steel plate 11 including a steel plate 111 and a plated layer 112 provided on at least one surface of the steel plate 111; and a coating 12 in which an aqueous surface treatment agent obtained by blending a polyolefin (A) and an ionomer (B) having a melting point of 50-85°C in a solvent with a mass ratio represented by (A) / (B) set to 0.3-1.0, and having a fluororesin content of less than 0.1 mass% with respect to a total mass of the aqueous surface treatment agent is applied to at least a part of the surface of the plated layer 112, and the plated steel plate is dried by setting an arrival temperature of the plated steel plate at 100°C or higher.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a surface-treated plated steel sheet and a hat joiner.

Background Art

[0002] A joiner is used at the joint between exterior wall boards in building exteriors and has the function of holding the exterior wall boards at regular intervals. A caulking material is filled in the joint between the exterior wall boards for the purpose of ensuring waterproofness and airtightness. At this time, if the caulking material filled in the joint adheres to the side end faces between the two exterior wall boards and the joiner on three sides, it becomes difficult for the caulking material to expand and contract. Therefore, when the exterior wall boards expand and contract according to changes in the external environment, the caulking material cannot follow the expansion and contraction of the exterior wall boards, and the stress due to the expansion and contraction of the exterior wall boards concentrates on the caulking material, making the caulking material likely to break.

[0003] Therefore, it is common to perform caulking construction so that the caulking material adheres to the side end faces of adjacent exterior wall boards but does not adhere to the joiner, that is, so that it becomes a two-sided adhesion. As a method of achieving two-sided adhesion, a method of forming a film with low adhesiveness to the caulking material, that is, a non-adhesive film, on the surface of the joiner that contacts the caulking material has been studied. For example, Patent Document 1 discloses a joiner provided with an adhesive tape on the surface that contacts the caulking material of the joiner, and the peeling force from the caulking material is adjusted within a predetermined range. Patent Document 2 discloses a coated plate provided with a coating film containing a specific fluororesin and non-adhesive to the caulking material on a base material, and a joiner processed from this coated plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0005] However, in the method described in Patent Document 1, after processing the metal plate into the shape of a joiner, adhesive tape is attached to the surface of the metal plate that comes into contact with the caulking material, which complicates the manufacturing process of the joiner and increases manufacturing costs. The painted boards and joiners described in Patent Document 2 have poor weather resistance, and when exposed to sunlight outdoors, their non-adhesion to the caulking material decreases, which presents a problem.

[0006] The present invention aims to provide a surface-treated plated steel sheet that can be manufactured in a continuous line and exhibits excellent non-adhesion to caulking material even when exposed to sunlight, and a hat joiner that exhibits excellent non-adhesion to caulking material even when exposed to sunlight. [Means for solving the problem]

[0007] The present invention has the following aspects. [1] A plated steel sheet having a plating layer on at least one surface, A water-based surface treatment agent comprising a polyolefin (A) and an ionomer (B) having a melting point of 50 to 85°C, blended in a solvent with a mass ratio of polyolefin (A) / ionomer (B) of 0.3 to 1.0, wherein the water-based surface treatment agent is applied to at least a portion of the surface of the plating layer, and the plated steel sheet is dried to a temperature of 100°C or higher to obtain a film, A surface-treated plated steel sheet having the following features. [2] The surface-treated plated steel sheet of [1], wherein the plated steel sheet is a Zn-Al plated steel sheet, a Zn-Al-Mg plated steel sheet, or an Al plated steel sheet. [3] A hat joiner having the surface-treated plated steel sheet of [1] or [2] and having raised ridges, A hat joiner in which the coating is located at least on the tip surface of the protrusion. [4] A coating step of applying a water-based surface treatment agent to at least a portion of the surface of the plating layer of a plated steel sheet having a plating layer on at least one surface to obtain a coating film, The process includes a drying step of drying the coating to form a film on the surface of the plated steel sheet, The aqueous surface treatment agent is a composition obtained by blending polyolefin (A) and ionomer (B), which have melting points of 50 to 85°C, with a solvent in a mass ratio of polyolefin (A) / ionomer (B) of 0.3 to 1.0, wherein the fluororesin content relative to the total mass of the aqueous surface treatment agent is less than 0.1% by mass. A method for manufacturing a surface-treated plated steel sheet, wherein the drying step brings the plated steel sheet to a temperature of 100°C or higher. [5] The method for manufacturing the surface-treated plated steel sheet according to [4], wherein the plated steel sheet is a Zn-Al plated steel sheet, a Zn-Al-Mg plated steel sheet, or an Al plated steel sheet. [6] A manufacturing step for manufacturing a surface-treated plated steel sheet by the manufacturing method of the surface-treated plated steel sheet described in [4] or [5] above, The process includes a processing step of processing the surface-treated plated steel sheet obtained by the above manufacturing step to obtain a hat joiner having raised grooves, A method for manufacturing a hat joiner, comprising the processing step of processing the surface-treated plated steel sheet such that the coating is located at least on the tip surface of the protrusion. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a surface-treated plated steel sheet that can be manufactured in a continuous line and has excellent non-adhesion to caulking material even when exposed to sunlight, and a hat joiner that also has excellent non-adhesion to caulking material even when exposed to sunlight. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic cross-sectional view showing one embodiment of the surface-treated plated steel sheet of the present invention. [Figure 2] It is a perspective view schematically showing an embodiment example of the hat joiner of the present invention. [Figure 3] It is a cross-sectional view schematically showing an embodiment example of the state where the hat joiner of the present invention is constructed.

Mode for Carrying Out the Invention

[0010] "Surface-treated plated steel sheet" Hereinafter, an embodiment example of the surface-treated plated steel sheet of the present invention will be described. FIG. 1 is a cross-sectional view schematically showing an embodiment example of the surface-treated plated steel sheet of the present invention. The surface-treated plated steel sheet 10 of this embodiment example is composed of a plated steel sheet 11 and a film 12 provided on the plated steel sheet 11. In this specification, the surface on the film 12 side of the surface-treated plated steel sheet 10 is also referred to as "the first surface 10a of the surface-treated plated steel sheet 10", and the surface on the plated steel sheet 11 side is also referred to as "the second surface 10b of the surface-treated plated steel sheet 10". In addition, in FIG. 1, for convenience of explanation, the dimensional ratio is different from the actual one.

[0011] <Plated steel sheet> The plated steel sheet 11 shown in FIG. 1 has a steel sheet 111 and a plating layer 112 provided on the first surface 111a of the steel sheet 111. In this specification, the surface on the opposite side of the first surface 111a of the steel sheet 111 is also referred to as "the second surface 111b of the steel sheet 111". That is, in the illustrated example, the second surface 111b of the steel sheet 111 is also the second surface 10b of the surface-treated plated steel sheet 10.

[0012] The first surface 111a of the steel sheet 111 may be subjected to treatments such as water washing, alkaline degreasing, pickling, heat treatment, etc. before the plating layer 112 is formed. Similarly, the second surface 111b of the steel sheet 111 may also be subjected to treatments such as water washing, alkaline degreasing, pickling, heat treatment, etc.

[0013] The plating layer may be provided on both sides of the steel sheet. That is, the plating layer 112 may be provided on both the first surface 111a and the second surface 111b of the steel sheet 111.

[0014] The plated steel sheet 11 is not particularly limited, and any known plated steel sheet can be used. Examples of plated steel sheets 11 include zinc-plated steel sheets (Zn-plated steel sheets), aluminum-plated steel sheets (Al-plated steel sheets), zinc-aluminum-plated steel sheets (Zn-Al-plated steel sheets), zinc-aluminum-magnesium-plated steel sheets (Zn-Al-Mg-plated steel sheets), etc. The plated steel sheet 11 may be an Al-based plated steel sheet containing aluminum in the plating layer, such as an Al-plated steel sheet, a Zn-Al-plated steel sheet, or a Zn-Al-Mg-plated steel sheet.

[0015] The amount of plating layer 112 adhering to the steel plate 111 (weight per unit area) is not particularly limited, but is generally 100-200 g / m². 2 Preferably, 110-160 g / m² 2 This is preferable. The thickness (plate thickness) of the plated steel sheet 11 is not particularly limited, but is preferably 0.2 to 0.6 mm, and more preferably 0.27 to 0.4 mm.

[0016] <coating> The film 12 shown in Figure 1 is formed by applying the following aqueous surface treatment agent to the surface 112a of the plating layer 112, and drying the plated steel sheet 11 at a temperature of 100°C or higher. Here, the surface 112a of the plating layer 112 refers to the side of the plating layer 112 that is not in contact with the steel sheet 111. The plating layer 112 may or may not have one or more other layers on its surface 112a side that are different from the plated metal substrate. The plating layer 112 may have these other layers on all or part of its surface 112a. These other layers may be oxide films, which are commonly found on general plated surfaces. Furthermore, these other layers may be surface treatment films formed by surface treatment agents such as chemical conversion agents. If there are other layers different from the plated metal substrate on the surface 112a side of the plating layer 112, the film 12 will be in contact with these other layers. If there are no other layers, the plated metal substrate will be exposed on the surface 112a, and the film 12 will be in contact with the plated metal substrate. Furthermore, in this specification, the side of the coating 12 that is not in contact with the plating layer 112 is also referred to as the "surface 12a of the coating 12". That is, in the illustrated example, the surface 12a of the coating 12 is also the first surface 10a of the surface-treated plated steel sheet 10.

[0017] Furthermore, the film 12 is formed when the polyolefin (A), described later and contained in the aqueous surface treatment agent, melts and then solidifies, and the polyolefin (A) and ionomer (B) mix together during the process of the solvent, described later and contained in the aqueous surface treatment agent, volatilizing. However, the melting of polyolefin (A) requires a temperature above its melting point and depends on the temperature reached by the plated steel sheet 11, making it difficult to determine to what extent the polyolefin (A) melted before solidifying. In other words, it is impossible or impractical to directly identify the film 12 by its structure or properties. Therefore, it is more appropriate to define the film 12 as "formed by applying an aqueous surface treatment agent to at least a part of the surface of the plating layer and drying the plated steel sheet at a temperature of 100°C or higher."

[0018] The thickness (film thickness) of the coating 12 is not particularly limited, but the amount of coating 12 adhering to the plating layer 112 after drying (weight per unit area) should be 0.1 to 2.0 g / m². 2A suitable amount is 0.3 to 1.0 g / m². 2 A quantity that results in this is more preferable.

[0019] (Water-based surface treatment agent) The aqueous surface treatment agent is a composition obtained by blending polyolefin (A) and ionomer (B) in a solvent in a specific ratio. The aqueous surface treatment agent is substantially free of fluororesin. Furthermore, the aqueous surface treatment agent may optionally contain components other than polyolefin (A), ionomer (B), and solvent (hereinafter also referred to as "optional components"), as long as they do not impair the effects of the present invention. In other words, the coating 12 is a film formed by mixing polyolefin (A) and ionomer (B), and contains optional components as needed, but is substantially free of fluororesin.

[0020] <<Polyolefin (A)>> Examples of polyolefin (A) (hereinafter also referred to as "component (A)") include polymers of olefins, polyolefin waxes, and modified polyolefin waxes obtained by modifying polyolefin waxes. These (A) components may be used individually or in combination of two or more.

[0021] Examples of olefins include ethylene, propylene, isoprene, and alkenes such as α-butene. These olefins may be used individually or in combination of two or more. Polymers of olefins are obtained by polymerizing olefins using known polymerization reactions such as radical polymerization and cationic polymerization. In this case, monomers copolymerizable with olefins (hereinafter also referred to as "other monomers") may be used in combination. That is, polymers of olefins may be copolymers of olefins and other monomers. Other monomers include acid anhydrides and carboxylic acids that have double bonds in their molecules. Specific examples of other monomers include unsaturated carboxylic acids such as (meth)acrylic acid, maleic acid, fumaric acid, itaconic acid, and citraconic acid; and acid anhydrides such as maleic anhydride, itaconic anhydride, and citraconic anhydride. These other monomers may be used individually or in combination of two or more. In this specification, "(meth)acrylic acid" refers to both acrylic acid and methacrylic acid.

[0022] Examples of polyolefin waxes include polyethylene wax, polypropylene wax, paraffin wax, Fischer-Tropsch wax, and microcrystalline wax. These polyolefin waxes may be used individually or in combination of two or more types. Examples of modified polyolefin waxes include acid-modified polyolefin waxes obtained by acid-modifying polyolefin wax with an unsaturated carboxylic acid or its acid anhydride, and oxidized polyolefin waxes obtained by oxidizing polyolefin wax. These modified polyolefin waxes may be used individually or in combination of two or more. Examples of unsaturated carboxylic acids or their acid anhydrides used for the acid modification of polyolefin waxes include those previously exemplified in the description of other monomers above.

[0023] The melting point of component (A) is 50-85°C. In this invention, "melting point" refers to the temperature at which the sample is heated at a rate of 1°C / min using a melting point measuring device and all of the solid material has melted.

[0024] (A) Component may be used in a dispersed state in a solvent such as water. When dispersing component (A) in a solvent, an emulsifier may or may not be used.

[0025] <<Ionomer (B)>> Ionomer (B) (hereinafter also referred to as "component (B)") is a resin having a structure in which the molecules of copolymers such as ethylene-methacrylic acid copolymer and ethylene-acrylic acid copolymer are ionically crosslinked by metal ions such as sodium and zinc.

[0026] The Vicat softening point of component (B) is not particularly limited, but is preferably 50 to 75°C, and more preferably 50 to 60°C. The "Vicat softening point" is a value in accordance with JIS K 6740-2:1999. The tensile fracture strain of component (B) is not particularly limited, but is preferably 300-460%, and more preferably 360-460%. "Tensile fracture strain" refers to a value in accordance with JIS K 7161-2:2014.

[0027] Component (B) can be manufactured by known methods. Alternatively, component (B) may be used in a dispersed state in a solvent such as water. When dispersing component (B) in a solvent, an emulsifier may or may not be used. (B) Component (B) may be used alone or in combination of two or more components.

[0028] Polyolefin (A) and ionomer (B) are blended in a solvent with a mass ratio of polyolefin (A) / ionomer (B) (hereinafter also referred to as the "A / B ratio") of 0.3 to 1.0.

[0029] The total amount of polyolefin (A) and ionomer (B) relative to the total mass of the aqueous surface treatment agent (hereinafter also referred to as "A+B amount") is preferably 1 to 40% by mass, and more preferably 3 to 25% by mass. If the A+B amount is within the above range, it becomes easier to apply the aqueous surface treatment agent to the surface 112a of the plating layer 112, and it becomes easier to achieve the desired film thickness of the coating 12. The amount of A+B relative to the total mass of the coating 12 is preferably 40-100% by mass, more preferably 60-100% by mass, and even more preferably 80-100% by mass.

[0030] <<Solvent>> Examples of solvents include water, and mixed solvents of water and water-soluble organic solvents. Examples of water-soluble organic solvents include alcohols such as methanol, ethanol, n-propanol, isopropanol, and butanol; ketones such as acetone and methyl ethyl ketone; and glycols such as ethylene glycol, diethylene glycol, and propylene glycol. These solvents may be used individually or in combination of two or more. Furthermore, when using component (A) or component (B) in a dispersed state in a solvent, the solvent in which component (A) or component (B) is dispersed shall also be considered a solvent included in the aqueous surface treatment agent.

[0031] Water is preferred as the solvent. The water content relative to the total mass of the solvent is preferably 70-100% by mass, more preferably 80-100% by mass, and even more preferably 90-100% by mass. The higher the water content in the solvent, the lower the environmental impact. The solvent content relative to the total mass of the aqueous surface treatment agent is preferably 60 to 99% by mass, and more preferably 75 to 97% by mass.

[0032] <<Optional ingredients>> Optional components include rust inhibitors, surfactants, pH adjusters (e.g., alkaline components such as sodium hydroxide, acidic components such as organic and inorganic acids), defoamers, leveling agents, crosslinking agents, and plasticizers. These optional components may be used individually or in combination of two or more.

[0033] Examples of rust inhibitors include compounds containing Si, Zr, Hf, Ti, and Sn. Compounds containing Si (hereinafter also referred to as "silicon compounds") are not particularly limited, but examples include silica such as liquid-phase silica, gas-phase silica, fumed silica, and aluminum-modified silica; silicates such as sodium silicate, potassium silicate, and lithium silicate, which are represented by water glass; silicon tetrachloride; and silane coupling agents. These silicon compounds may be used individually or in combination of two or more.

[0034] Compounds containing Zr (hereinafter also referred to as "zirconium compounds") are not particularly limited, but examples include carbonates, oxides, nitrates, sulfates, phosphates, fluorides, fluoroacids (salts), organic acid salts, and organic complex compounds containing zirconium atoms. More specifically, examples include basic zirconium carbonate, zirconium oxycarbonate, ammonium zirconium carbonate ((NH4)2[Zr(OH)2(CO3)2]), zirconium(IV) oxide (zirconia), potassium zirconium carbonate, zirconium nitrate, zirconyl nitrate (ZrO(NO3)2), zirconium(IV) sulfate, zirconyl sulfate, zirconium oxyphosphate, zirconium pyrophosphate, zirconyl dihydrogen phosphate, zirconium fluoride, hexafluorozirconic acid (H2ZrF6), ammonium hexafluorozirconate ((NH4)2ZrF6), zirconium acetylacetonate (Zr[OC(CH3)CHCO(CH3)]4), zirconyl acetate, zirconium chloride, calcium zirconate, zirconium ethoxide, and zirconium hexafluoroacetylacetonate. These zirconium compounds may be used individually or in combination of two or more.

[0035] The compounds containing Hf (hereinafter also referred to as "hafnium compounds") are not particularly limited, but examples include hafnium oxide and hexafluorohafnium hydroacid. These hafnium compounds may be used individually or in combination of two or more.

[0036] Compounds containing Ti (hereinafter also referred to as "titanium compounds") are not particularly limited, but examples include carbonates, oxides, nitrates, sulfates, phosphates, fluorides, fluoroacids (salts), organic acid salts, and organic complex compounds containing titanium atoms. More specifically, examples include titanium nitrate, titanium(IV) oxide (titania), titanium(III) sulfate, titanium(IV) sulfate, sodium titanate, titanium ethoxide, titanyl sulfate (TiOSO4), titanium(III) fluoride, titanium(IV) fluoride, hexafluorotitanium acid (H2TiF6), ammonium hexafluorotitanium ((NH4)2TiF6), titanium laurate, and titanium acetylacetonate (Ti[OC(CH3)CHCO(CH3)]4). These titanium compounds may be used individually or in combination of two or more.

[0037] Compounds containing tin (hereinafter also referred to as "tin compounds") are not particularly limited, but examples include tin(IV) oxide, sodium stannate (Na2SnO3), tin(II) chloride, tin(IV) chloride, tin(II) nitrate, tin(IV) nitrate, and ammonium hexafluorosutate ((NH4)2SnF6). These tin compounds may be used individually or in combination of two or more.

[0038] These rust inhibitors may be used individually or in combination of two or more types. The content of the rust inhibitor relative to the total mass of the coating 12 is preferably 0.1 to 20% by mass, and more preferably 0.5 to 10% by mass. The content of the rust inhibitor relative to the total mass of the coating 12 is expressed in terms of Si, Zr, Hf, Ti, or Sn equivalents.

[0039] <<Fluororesin>> Water-based surface treatment agents contain substantially no fluororesin. In this invention, "substantially absent" means not actively incorporating a substance, excluding those unintentionally present. Specifically, the content of fluororesin relative to the total mass of the aqueous surface treatment agent is less than 0.1% by mass, and preferably less than 0.01% by mass. Furthermore, the coating 12 is substantially free of fluororesin. Specifically, the fluororesin content relative to the total mass of the coating 12 is less than 0.1% by mass, and preferably less than 0.01% by mass. Examples of fluororesins include PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxyalkane), and PCTFE (polychlorotrifluoroethylene).

[0040] <<Physical properties etc.>> The pH of the aqueous surface treatment agent at 25°C is not particularly limited as long as the effects of the present invention can be obtained, but it is preferably 6 to 11, and more preferably 8 to 11. The temperature of the aqueous surface treatment agent is not particularly limited as long as the effects of the present invention can be obtained, but it is preferable that it does not exceed the melting point of polyolefin (A).

[0041] <<Manufacturing method>> Aqueous surface treatment agents can be prepared by adding components (A) and (B) in specific ratios, along with optional components as needed, to a solvent and stirring.

[0042] <Manufacturing method for surface-treated plated steel sheets> Next, an example of a method for manufacturing the surface-treated plated steel sheet 10 will be described. Note that the method for manufacturing the surface-treated plated steel sheet 10 is not limited to the following example. The manufacturing method for the surface-treated plated steel sheet 10 of this embodiment comprises the coating step and drying step described below. Furthermore, the manufacturing method may include the pretreatment step described below prior to the coating step.

[0043] (Pre-treatment process) The pretreatment step is a step of pretreatment of the plated steel sheet 11 before applying the water-based surface treatment agent. Examples of pretreatment for the plated steel sheet 11 include washing with water and alkaline degreasing. These pretreatments may be performed individually or in combination of two or more.

[0044] (Coating process) The coating process involves applying the above-mentioned aqueous surface treatment agent to the surface 112a of the plating layer 112 of the plated steel sheet 11 to obtain a coating film. The application method for water-based surface treatment agents is not particularly limited, but examples include roll coating, curtain flow coating, air spray, airless spray, immersion, bar coating, and brush application. The application of water-based surface treatment agents is not limited, but the amount of film 12 adhering to the plating layer 112 after drying (weight per unit area) should be 0.1 to 2.0 g / m². 2 A suitable amount is 0.3 to 0.6 g / m². 2 A quantity that results in this is more preferable.

[0045] (drying process) The drying step is a step in which the coating film formed on the surface 112a of the plating layer 112 obtained in the coating step is dried to form a film 12 on the surface 112a of the plating layer 112. This results in a surface-treated plated steel sheet 10 in which a film 12 containing components (A) and (B) is applied to the surface 112a of the plating layer 112. The method for drying the coating film is not particularly limited, but examples include hot air drying and induction heating.

[0046] In the drying process, the plated steel sheet 11 is brought to a temperature of 100°C or higher. That is, the coating 12 is formed by drying the coating film that has been formed on the surface 112a of the plating layer 112, and the temperature reached by the plated steel sheet 11 at this time is 100°C or higher. As the coating film dries, component (A) in the coating film melts, and the solvent in the coating film evaporates. After the drying process, this melted component (A) is cooled to a temperature lower than the melting point of component (A) and solidifies, forming a film and obtaining a coating 12 that adheres to the surface 112a of the plating layer 112. In other words, the coating 12 is a film that is fused and adhered to the surface 112a of the plating layer 112. If the temperature reached by the plated steel sheet 11 is above the lower limit, the (A) component in the coating will solidify after it has sufficiently melted, so the coating will be sufficiently formed. The upper limit of the temperature that the plated steel sheet 11 can reach during the drying process is not particularly limited, but it is generally preferable that the temperature reached by the plated steel sheet 11 is 250°C or lower, and more preferably 200°C or lower. The temperature reached by the plated steel sheet 11 can be measured by any method depending on the environment in which the present invention is implemented, but for example it can be measured by a non-contact thermometer or a temperature-indicating material (for example, "Thermolabel" manufactured by NOF Corporation).

[0047] <Effects and Effects> The surface-treated plated steel sheet 10 of this embodiment, as described above, has the aforementioned film 12 provided on the surface of the plating layer 112 of the plated steel sheet 11. The film 12 is a film that is non-adherent to caulking material, but also has excellent weather resistance, so it can maintain good non-adhesion to caulking material even when exposed to sunlight. In addition, the film 12 also has excellent abrasion resistance, so it is not easily peeled off by friction. Therefore, the surface-treated plated steel sheet 10 of this embodiment can be manufactured using a pre-coating method in continuous lines such as CGL (Continuous Galvanizing Line) and CCL (Color Coating Line), and can be manufactured at low cost. Thus, the surface-treated plated steel sheet 10 of this embodiment can be manufactured in a continuous line and exhibits excellent non-adhesion to caulking material even when exposed to sunlight. In this specification, "abrasion resistance" refers to resistance to abrasion scratches that may occur due to friction during the manufacturing or transportation stages, as well as the peeling resistance of the coating 12. In particular, when surface-treated plated steel sheets 10 are manufactured on a continuous line, the surface-treated plated steel sheets 10 have many opportunities to come into contact with rolls, guides, etc. The higher the abrasion resistance of the coating 12, the less likely the coating 12 is to peel off even if it is rubbed by contact with rolls, guides, etc., making it suitable for the manufacture of surface-treated plated steel sheets 10 on a continuous line.

[0048] <Other Embodiments> The surface-treated plated steel sheet of the present invention is not limited to those described above. For example, in the above-described embodiment, the plating layer 112 of the plated steel sheet 11 is provided only on the first surface 111a of the steel sheet 111, but the plating layer 112 may be provided on both sides of the steel sheet 111. That is, the plating layer 112 may also be provided on the second surface 111b of the steel sheet 111. In this case, the surface of the plating layer (not shown) provided on the second surface 111b may or may not have the previously exemplified film provided thereon. Furthermore, in the above-described embodiment, the film 12 is provided on the entire surface 112a of the plating layer 112, but the film 12 may be provided on only a part of the surface 112a of the plating layer 112.

[0049] <Application> The surface-treated plated steel sheet of the present invention is suitably used as a steel material for joiners, particularly hat joiners, used in the joints between exterior wall boards in building exteriors.

[0050] "Hat Joiner" The following describes an example of an embodiment of a hat joiner using the surface-treated plated steel sheet of the present invention. Figure 2 is a schematic perspective view showing one embodiment of the hat joiner of the present invention. Figure 3 is a schematic cross-sectional view showing one embodiment of the hat joiner of the present invention in an installed state. Note that in Figures 2 and 3, the dimensional ratios differ from those of the actual components for the sake of explanation. Also, in Figures 2 and 3, the same reference numerals are used for components that are the same as those in Figure 1, and their explanations are omitted.

[0051] The hat joiner 20 in this embodiment is made by processing the surface-treated plated steel sheet 10 described above into a hat shape. The hat joiner 20 comprises a protrusion 21 projecting perpendicular to the surface direction and a brim portion 22 projecting horizontally from both ends of the protrusion 21. The "brim portion" is also called the "fixing portion". The coating on the surface-treated plated steel sheet 10 is located at least on the tip surface 21a of the protruding ridge 21.

[0052] <How to manufacture a hat joiner> The manufacturing method of the hat joiner 20 in this embodiment is not particularly limited, but for example, it includes the manufacturing process and processing process shown below. However, the manufacturing method of the hat joiner 20 is not limited to the following example. The manufacturing process is a process of manufacturing the surface-treated plated steel sheet 10 using the method for manufacturing the surface-treated plated steel sheet 10 described above. The manufacturing process is the same as the manufacturing method for the surface-treated plated steel sheet 10 described above, so its explanation will be omitted.

[0053] The processing step involves processing the surface-treated plated steel sheet 10 obtained in the manufacturing step to obtain a hat joiner 20 equipped with raised ridges 21. In the processing step, the surface-treated plated steel sheet 10 is processed so that the coating on the surface-treated plated steel sheet 10 is located at least on the protruding end surface 21a of the protrusions 21. Specifically, the surface-treated plated steel sheet 10 is processed into a hat shape so that the surface 12a of the coating 12 on the surface-treated plated steel sheet 10, i.e., the first surface 10a of the surface-treated plated steel sheet 10, faces outwards. Here, "outside" refers to the outer surface of the hat joiner 20, that is, the side that is in contact with the exterior wall board. The processing method for the surface-treated plated steel sheet 10 is not particularly limited, but examples include press working.

[0054] <Installation of Hat Joiner> The caulking method using the hat joiner 20 of this embodiment is not particularly limited, but can be performed, for example, by the method described below. Note that the caulking method is not limited to the following examples. First, the hat joiner 20 is placed on the substrate of the exterior wall, and the flange portion 22 is fixed to the substrate with fasteners such as screws. At this time, the hat joiner 20 is positioned so that the second surface 10b of the surface-treated plated steel sheet 10 that constitutes the hat joiner 20 is in contact with the substrate of the exterior wall. Next, as shown in Figure 3, exterior wall boards 30 are placed on both sides of the hat joiner 20, and the exterior wall boards 30 are fixed to the flange portion 22 with fasteners such as screws. At this time, the exterior wall boards 30 are positioned so that the back surface 30a of the exterior wall board 30 is in contact with the outer surface of the hat joiner 20, that is, with the first surface 10a of the surface-treated plated steel sheet 10. By arranging the two exterior wall boards 30 via the hat joiner 20 in this manner, a joint is formed between the protruding end surface 21a of the convex ridge 21 of the hat joiner 20 and the side end surface 30b of the exterior wall board 30. By filling this joint with sealant 40, waterproofing and airtightness are ensured. The caulking material 40 is not particularly limited, but examples include urethane resin and silicone resin. Alternatively, before construction, a primer for caulking material may be applied to at least the protruding end surface 21a of the protrusion 21 and allowed to dry to form a primer layer (not shown).

[0055] Since the coating 12 of the surface-treated plated steel sheet 10 is located on the tip surface 21a of the protruding ridge 21, the tip surface 21a of the protruding ridge 21 is not adhesive to the caulking material 40. Therefore, although the caulking material 40 is bonded to the side end surfaces 30b of the two exterior wall boards 30, it does not adhere well to the tip surface 21a of the protruding ridge 21, and is instead bonded on two surfaces between the two exterior wall boards 30. Therefore, when the exterior wall board 30 expands or contracts in response to changes in the external environment, the caulking material 40 can expand or contract to follow the expansion or contraction of the exterior wall board 30, thereby suppressing the rupture of the caulking material 40.

[0056] <Effects and Effects> As described above, the hat joiner 20 of this embodiment is made by processing the surface-treated plated steel sheet 10 of the present invention, and therefore has excellent non-adhesive properties even when exposed to sunlight. Moreover, by using the hat joiner 20 of this embodiment, caulking can be performed with two-sided adhesion. Furthermore, in this embodiment, since the protruding end surface 21a of the convex ridge 21 of the hat joiner 20 is non-adherent to the caulking material 40, there is no need to attach adhesive tape or the like, with adjusted peeling force from the caulking material 40, to the protruding end surface 21a. In addition, the surface-treated plated steel sheet 10 can be manufactured in a continuous line. Therefore, with this invention, a hat joiner with excellent non-adhesion even when exposed to sunlight can be manufactured at low cost.

[0057] <Other Embodiments> The hat joiner of the present invention is not limited to those described above. For example, the hat joiner 20 of the above-described embodiment is made by processing a surface-treated plated steel sheet 10 in which the coating 12 is provided on the entire surface of the plated layer. Therefore, the coating 12 is located on the surface of the flange portion 22 in addition to the tip surface 21a of the protrusion 21, but the coating 12 only needs to be located on the tip surface 21a of the protrusion 21, or it may be located only on the tip surface 21a of the protrusion 21. [Examples]

[0058] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[0059] "material" <(A) Ingredient or substitute therefor> The following compounds were used as component (A) or its substitute (component (A')). A-1: Polyolefin (melting point 80°C). A-2: Polyolefin (melting point 53°C). A-3: Polyolefin (melting point 72°C). A'-4: Polyolefin (melting point 115°C). A'-5: Polyolefin (melting point 123°C). A'-6: Polyolefin (melting point 128°C).

[0060] <(B) Component or substitute therefor> The following compounds were used as component (B) or its substitute (component (B')). • B-1: Ionomer emulsion (an emulsion of resin having a structure in which the intermolecules of ethylene-methacrylic acid copolymer are ionically crosslinked by sodium ions). B'-2: Acrylic emulsion. B'-3: Urethane emulsion.

[0061] <Optional ingredients> Zirconium ammonium carbonate was used as an optional component.

[0062] "Measurement and Evaluation" <Evaluation of non-adhesion> The non-adhesion properties of surface-treated plated steel sheets immediately after fabrication and surface-treated plated steel sheets after outdoor exposure were evaluated as follows. For outdoor exposure, the exposure angle was set to 35° and the installation direction was facing south, in accordance with JIS Z 2381:2017, and the samples were exposed outdoors for 30 days. Next, a primer for caulking material (manufactured by Nichiha Corporation, product name "FCP44") was applied to the surface of the coating on each surface-treated plated steel sheet using a brush, and dried at room temperature for 60 minutes to form a primer layer. After that, a modified silicone-based caulking material (manufactured by Nichiha Corporation, product name "FCT5232C") was applied to the surface of the primer layer, and the caulking material was dried by leaving it at 40°C for one week to prepare test specimens. For the obtained test specimens, the dried caulking material was peeled off by hand from the surface-treated plated steel sheet. Those that peeled off easily were marked with "○", and those that did not peel off were marked with "×".

[0063] <Evaluation of abrasion resistance> As a method for determining whether or not manufacturing is feasible on continuous lines such as CGL and CCL, abrasion resistance was evaluated as follows. Three seconds after removing the surface-treated plated steel sheet from the hot air drying oven, the surface of the plated side was rubbed with a paper wiper (manufactured by Nippon Paper Crecia Co., Ltd., product name "Kimtowel"). Sheets that showed no change in appearance were marked with "○", and those where the coating peeled off were marked with "×".

[0064] Examples 1-36, Comparative Examples 1-9 <Preparation of water-based surface treatment agent> In Examples 1-30 and Comparative Examples 1-9, water was used as the solvent, and components (A) or (A') and (B) or (B') were added in the A / B ratios shown in Tables 1-3, and the mixture was stirred to prepare an aqueous surface treatment agent. Furthermore, the total amount of component (A) or (A') and component (B) or (B') relative to the total mass of the aqueous surface treatment agent was 20% by mass.

[0065] In Examples 31-36, component (A) and component (B) were added to water, the solvent, in the A / B ratio shown in Table 2. Furthermore, optional components were added so that their content relative to the total mass of the film matched the values ​​shown in Table 2, and the mixture was stirred to prepare an aqueous surface treatment agent. Note that the content of any optional component relative to the total mass of the coating is expressed in terms of Zr equivalent. Furthermore, the combined amount of component (A) and component (B) relative to the total mass of the aqueous surface treatment agent was 20% by mass.

[0066] <Fabrication of surface-treated plated steel sheets> As a plated steel sheet, a Zn-Al-Mg plated steel sheet has a Zn-Al-Mg plating layer on both sides of the steel sheet (sheet thickness 0.3 mm, plating layer adhesion amount 60 g / m² per side). 2 ) was used. An alkaline degreasing agent (manufactured by Nippon Parkerizing Co., Ltd., product name "Fine Cleaner E6408") was prepared as an aqueous solution at a concentration of 20 g / L and a temperature of 60°C. The plated steel sheet was immersed in this aqueous solution for 10 seconds, rinsed with pure water, dried, and the plated steel sheet was pre-treated. After pretreatment, the previously prepared aqueous surface treatment agent was applied to one surface (one side), i.e., the surface of the plating layer, using a bar coating method at room temperature of 25°C. Then, the plated steel sheet was dried in a hot air drying oven until the temperature reached, as confirmed by a thermolabel (manufactured by NOF Corporation, trade name "Thermolabel") attached to the plated steel sheet, reached the values ​​shown in Tables 1-3. This resulted in a surface-treated plated steel sheet with a film formed on the surface of the plating layer. The amount of film adhering to the plating layer after drying was 0.5 g / m². 2 That was the case. The resulting surface-treated plated steel sheets were used to evaluate their non-adhesion and abrasion resistance. The results are shown in Tables 1-3. In the cases of Examples 1 to 30 and Comparative Examples 1 to 9, the total amount of component (A) or component (A') and component (B) or component (B') relative to the total mass of the coating was 100% by mass. In Examples 31, 33, and 35, the total amount of component (A) and component (B) relative to the total mass of the film was 98% by mass. In Examples 32, 34, and 36, the total amount of component (A) and component (B) relative to the total mass of the film was 90% by mass.

[0067] [Table 1]

[0068] [Table 2]

[0069] [Table 3]

[0070] In Tables 1-3, the "A / B ratio" is the mass ratio (composition ratio) expressed as (A) component / (B) component. However, if (A') component is used instead of (A) component, the mass ratio is expressed as (A') component / (B) component, and if (B') component is used instead of (B) component, the mass ratio is expressed as (A) component / (B') component. Note that blank spaces in the table indicate that the component is not included.

[0071] The surface-treated plated steel sheets obtained in each example exhibited excellent non-adhesion to caulking material even when exposed to sunlight. Furthermore, the surface-treated plated steel sheets obtained in each example also showed excellent abrasion resistance, demonstrating that they can be manufactured in a continuous production line. On the other hand, the surface-treated plated steel sheet obtained in Comparative Example 1, which had an A / B ratio of less than 0.3, exhibited poor non-adhesion to the caulking material and also poor non-adhesion after outdoor exposure. The surface-treated plated steel sheet obtained in Comparative Example 2, where the A / B ratio was greater than 1.0, exhibited poor abrasion resistance. The surface-treated plated steel sheets used in Comparative Examples 3-5, which utilized polyolefins with melting points exceeding 85°C, exhibited poor non-adhesion to caulking materials and also poor non-adhesion after outdoor exposure. The surface-treated plated steel sheets of Comparative Examples 6 and 7, which used acrylic emulsion or urethane emulsion instead of ionomer, exhibited poor non-adhesion after outdoor exposure. They also showed poor abrasion resistance. In Comparative Examples 8 and 9, the surface-treated plated steel sheets, in which the plated steel sheet reached a temperature of less than 100°C, exhibited poor non-adhesion to caulking material and poor non-adhesion after outdoor exposure. They also showed poor abrasion resistance. [Industrial applicability]

[0072] The surface-treated plated steel sheet of the present invention can be manufactured using a pre-coating method in a continuous line such as CGL or CCL, thus enabling the inexpensive production of non-adhesive surface-treated plated steel sheets. Furthermore, the resulting surface-treated plated steel sheet can maintain the non-adhesive properties of the surface treatment film even when exposed to sunlight, making it useful, for example, as a joiner used in joints between exterior wall boards. [Explanation of Symbols]

[0073] 10 Surface-treated plated steel sheet 11. Plated steel sheet 111 Steel plate 111a First surface 112 Plating layer 112a surface 12 Coating 20 Hat-Joyner 21 Convex Strip 21a Protruding surface

Claims

1. A plated steel sheet having a plating layer on at least one surface, A water-based surface treatment agent comprising a solvent containing polyolefin (A) and ionomer (B) having melting points of 50 to 85°C, with a mass ratio of polyolefin (A) / ionomer (B) of 0.3 to 1.0, wherein the water-based surface treatment agent is applied to at least a portion of the surface of the plating layer, and the plated steel sheet is dried to a temperature of 100°C or higher to obtain a film, and A surface-treated plated steel sheet having the following features.

2. The surface-treated plated steel sheet according to claim 1, wherein the plated steel sheet is a Zn-Al plated steel sheet, a Zn-Al-Mg plated steel sheet, or an Al plated steel sheet.

3. A hat joiner having a surface-treated plated steel sheet according to claim 1 or 2, and having a raised ridge, A hat joiner in which the coating is located at least on the tip surface of the protrusion.

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