JP7206982B2 - Coated metal sheet, joiner and bond breaker tape with same - Google Patents

Description

The present invention relates to coated metal sheets, joiners and bond breaker tapes having same.

Joiners are used in joints between exterior boards in building exteriors. The joiners have the function of holding the facing boards at regular intervals.

The joints between the outer wall boards are filled with a caulking material to ensure waterproofness and airtightness. At this time, if the caulking material is adhered to the side end surfaces of the two exterior boards and the joiner on three sides, the exterior boards expand and contract according to changes in the external environment (especially temperature changes), so the caulking material adheres to the exterior. The expansion and contraction of the board cannot be followed, and the stress due to the expansion and contraction of the exterior board concentrates on the caulking material, and the caulking material tends to break.

In order to eliminate such a problem, the caulking material adheres to the side end surfaces of two adjacent exterior boards but does not adhere to the joiner, that is, double-sided adhesion is performed. ing.

As a method for two-sided adhesion, a method of forming a coating film with low adhesiveness to the caulking material on the surface of the joiner in contact with the caulking material (receiving portion of the caulking material) is being studied. For example, a joiner having a coating film containing a specific fluororesin (see Patent Document 1) and a joiner having a coating film containing low-density polyethylene or polypropylene (see Patent Document 2) on the surface in contact with the caulking material have been disclosed. there is Further, a three-sided anti-adhesion tape containing polyolefin such as polyethylene and having adhesive strength and tensile strength adjusted within a predetermined range has been disclosed (for example, Patent Document 3).

JP-A-2009-62707 JP 2004-68464 A Japanese Patent Application Laid-Open No. 2004-108011

By the way, the joiner may be left outdoors after it is brought into the construction site until the building exterior is constructed. In the meantime, the surface of the joiner that comes into contact with the caulking material tends to adhere to the caulking material, and when the building exterior is constructed, there is a problem that three-sided adhesion occurs. The joiners disclosed in Patent Documents 1 and 2 and the joiner obtained using the tape of Patent Document 3 also have similar problems.

The present invention has been made in view of the above circumstances, and provides a coated metal plate that can maintain low adhesiveness to a caulking material even after being left outdoors, a joiner having the same, and a bond breaker tape. intended to provide

The present invention relates to a coated metal plate, a joiner using the same, and a bond breaker tape having the following structure.
[1] A metal plate and a coating layer containing a resin disposed on the surface of the metal plate, wherein the coating layer has a volume resistivity of 1 as measured in accordance with JIS C 2139:2008. 0×10 ¹⁷ Ω·cm or less, and the surface free energy calculated from the Kaelble-Uy formula based on the contact angle measured in accordance with JIS R 3257:1999 is 36.6 mJ/m ² or less. There is a coated metal plate.
[2] The coated metal plate according to [1], wherein the resin is an ethylene/vinyl acetate copolymer.
[3] The coated metal plate according to [1], wherein the resin is silicone rubber.
[4] The content ratio of structural units derived from vinyl acetate in the ethylene/vinyl acetate copolymer is 5% by mass or more and less than 20% by mass with respect to all structural units constituting the ethylene/vinyl acetate copolymer. , the coated metal sheet according to [2].
[5] The coated metal sheet according to any one of [1] to [4], wherein the coating layer further contains a slip agent.
[6] The coated metal sheet according to any one of [1] to [5], wherein the coating layer has a thickness of 3 to 120 μm.
[7] The coated metal sheet according to any one of [1] to [6], wherein the metal sheet has a chemical conversion coating disposed on the surface on which the coating layer is disposed.
[8] A joiner having the coated metal plate according to any one of [1] to [7] to be arranged in joints of adjacent exterior materials.
[9] The joiner has a ridge portion and a substrate portion connected to a base end portion of the ridge portion, and at least a surface of the ridge portion for supporting the caulking material has: The joiner of [8], wherein the covering layer is arranged.
[10] Having a release film, an adhesive layer, and a coating layer in this order, the coating layer containing a resin, and the volume resistance of the coating layer measured in accordance with JIS C 2139:2008. and a surface free energy of 36.6 mJ/m calculated from the ^Kaelble -Uy formula based on the contact angle measured in accordance with JIS R 3257:1999. ² or less bond breaker tape.
[11]
The bond breaker tape according to [10], wherein the resin is an ethylene/vinyl acetate copolymer.
[12] The bond breaker tape of [10], wherein the resin is silicone rubber.

ADVANTAGE OF THE INVENTION According to this invention, the coated metal plate which can maintain the non-adhesiveness with respect to a caulking material, and the joiner and bond breaker tape which have the same can be provided, even after leaving it outdoors.

FIG. 1 is a cross-sectional view showing a configuration example of a coated metal plate according to this embodiment. FIG. 2 is a partial perspective view showing an example of how the joiner is used. 3A and B are cross-sectional views of a joiner. FIG. 4 is a cross-sectional view of a bond breaker tape.

The present inventors have analyzed and studied the reasons why conventional joiners such as those shown in Patent Documents 1 and 2 tend to adhere to caulking material after being left outdoors. Although the details are not clear, It was inferred that the following phenomena may have occurred.

That is, while the joiner is left outdoors, dirt such as dust and dirt adheres (flys) to the coating film on the surface of the joiner, and it is considered that the dirt adheres due to outdoor light, moisture, heat, and the like. Then, it is thought that the adhered dirt becomes a starting point, and the caulking material becomes easier to adhere.

In other words, in order to maintain the non-adhesiveness to the caulking material, it is effective to maintain a surface state in which dirt is difficult to adhere. It is considered effective to lower the surface energy of the coating film surface. As a result of ^examining various materials, the inventors of the present invention have found that: and 2) when the surface free energy calculated from the Kaelble-Uy formula based on the contact angle measured in accordance with JIS R 3257: 1999 is 36.6 mJ/m ² or less, stains are less likely to stick. , can maintain non-adhesiveness with the caulking material.

Furthermore, among the materials that satisfy these physical properties, ethylene-vinyl acetate copolymers are generally used as sealants and adhesives. It has been found that stains are particularly difficult to adhere to the surface of the coating film, and good non-adhesiveness to the caulking material can be maintained. The present invention has been made based on such findings.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1. Covered Metal Plate FIG. 1 is a cross-sectional view showing the structure of a covered metal plate according to the present embodiment.

As shown in FIG. 1, coated metal plate 10 of the present embodiment has metal plate 11 and coating layer 13 disposed on the surface thereof.

(metal plate 11)
The metal plate 11 to be the base plate to be coated can be appropriately selected according to the application of the coated metal plate. Examples of the metal plate 11 include galvanized steel sheets, Zn-Al alloy plated steel sheets, Zn-Al-Mg alloy plated steel sheets, plated steel sheets such as aluminum plated steel sheets; cold-rolled steel sheets, stainless steel sheets (austenitic, martensitic, (including ferrite and ferrite-martensite duplex); aluminum plates; aluminum alloy plates; and copper plates. Among these, from the viewpoint of enhancing corrosion resistance, the metal plate 11 is preferably a plated steel plate, and more preferably a hot-dip plated steel plate. The coating weight of the plated steel sheet is not particularly limited, but can be, for example, 30 to 500 g/m ² .

The surface of the metal plate 11 may be subjected to a chemical conversion treatment from the viewpoint of enhancing the corrosion resistance and coating adhesion of the coated steel plate. The type of chemical conversion treatment is not particularly limited, but may be, for example, chromate treatment, chromium-free treatment, or phosphate treatment.

The thickness of the metal plate 11 is not particularly limited as long as it is set according to the application and workability. 6 mm is preferred.

Chemical conversion treatment can be carried out by a known method. For example, the chemical conversion treatment solution may be applied to the surface of the steel sheet by a method such as roll coating, spin coating, or spraying, and dried without washing with water. The drying temperature and drying time are not particularly limited as long as the moisture can be evaporated. From the viewpoint of productivity, the drying temperature is preferably in the range of 60 to 150° C., and the drying time is preferably in the range of 2 to 10 seconds. The amount of the chemical conversion coating applied is not particularly limited as long as it is within an effective range for improving corrosion resistance and coating adhesion. For example, in the case of a chromate film, the deposition amount may be adjusted so that the total Cr-equivalent deposition amount is 5 to 100 mg/m ² . In the case of chromium-free coatings, Ti—Mo composite coatings should have an adhesion amount of 10 to 500 mg/m ² , and fluoroacid coatings should have an adhesion amount converted to fluorine or an adhesion amount converted to total metal elements of 3 to 100 mg/m ² . The adhesion amount can be adjusted to Also, in the case of a phosphate film, the adhesion amount may be adjusted so as to be 5 to 500 mg/m ² .

(Coating layer 13)
The coating layer 13 is a layer containing resin (resin layer) arranged on at least part of the surface of the metal plate 11 . The covering layer 13 is the outermost layer of the covering metal plate 10 . The coating layer 13 has a volume resistivity of 1.0×10 ¹⁷ Ω·cm or less and a surface free energy of 36.6 mJ/m ² or less from the viewpoint of maintaining non-adhesiveness to the caulking material. ing.

When the volume resistivity of the coating layer 13 is 1.0×10 ¹⁷ Ω·cm or less, the coating layer 13 is less likely to be charged, so that static electricity is less likely to occur, and stains and the like are less likely to adhere during exposure to the outdoors. It can be made difficult. More preferably, the volume resistivity of the coating layer 13 is 4.0×10 ¹⁶ Ω·cm or less. Although the lower limit of the volume resistivity of the coating layer 13 is not particularly limited, it can be, for example, about 1.0×10 ¹² Ω·cm.

The volume resistivity of the coating layer 13 can be measured according to JIS C 2139:2008 "Solid electrical insulating materials-Methods for measuring volume resistivity and surface resistivity" (IEC 60093:1980). Specifically, it can be measured under the following conditions.
(Test condition)
Test equipment: Digital ultra-high resistance/micro current meter 8340A type (manufactured by ADC)
Electrode size: main electrode 50mmφ, guard electrode inner diameter 60mmφ, outer diameter 80mmφ
Applied voltage: 100V, 500V (DC)
Application time: 60 sec
Test environment: temperature 23±2°C, humidity 50±5% RH
Test piece size: 100mm x 100mm

When the surface free energy of the coating layer 13 is 36.6 mJ/m ² or less, the reactivity of the surface of the coating layer 13 is low. The low reactivity of the surface can make it difficult for dirt to adhere. More preferably, the surface free energy of the coating layer 13 is 34.2 mJ/m ² or less. The lower limit of the surface free energy of the coating layer 13 is not particularly limited, but can be, for example, 16.0 mJ/m ² .

The surface free energy of the coating layer 13 can be calculated based on the contact angle measured according to JIS R 3257:1999 (IEC62073). Specifically, it can be measured by the following procedure.
1) Measure the contact angle of pure water and methylene iodide in accordance with JIS R 3257:1999 "Method for testing wettability of substrate glass surface". As a measuring device, a portable contact angle meter PCA-1 (manufactured by Kyowa Interface Science Co., Ltd.) can be used.
2) Using the obtained contact angle value, the surface free energy is calculated from the Kaelble-Uy formula (γs = γs ^d + γs ^p , γs ^d : dispersion component of surface free energy, γs ^p : polar component of surface free energy). calculate.

The volume resistivity and surface free energy of the coating layer 13 can be adjusted by the composition of the coating layer 13, especially the type of resin.

The resin constituting the coating layer 13 is not particularly limited as long as the volume resistivity and surface free energy satisfy the above ranges, and may be an ethylene/vinyl acetate copolymer, silicone rubber, or the like.

[Ethylene-Vinyl Acetate Copolymer]
The ethylene/vinyl acetate copolymer contains structural units derived from ethylene and structural units derived from vinyl acetate.

The content ratio of structural units derived from vinyl acetate may be at a level that does not exhibit adhesiveness and provides low chargeability, and is 5% by mass based on all structural units constituting the ethylene/vinyl acetate copolymer. It is preferably at least 20% by mass. When the content ratio of the structural unit derived from vinyl acetate is 5% by mass or more, a low volume resistivity is likely to be obtained, so that low chargeability is likely to be obtained, and stains are less likely to adhere to the surface of the coating layer 13. If the content ratio of the vinyl acetate-derived structural unit is less than 20% by mass, it is difficult for the coating layer 13 to exhibit tackiness, making it difficult for dirt to adhere to the surface of the coating layer 13 . The content ratio of structural units derived from vinyl acetate is more preferably 5 to 17% by mass based on the total structural units constituting the ethylene/vinyl acetate copolymer.

The ethylene/vinyl acetate copolymer may further contain structural units derived from monomers other than ethylene and vinyl acetate. Examples of other monomers include 3 carbon atoms such as propylene, 1-butene, 3-methyl-1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-decene. α-olefins of ~20, (meth)acrylic acid, (meth)acrylic acid esters, and styrene. The content ratio of structural units derived from other monomers is preferably 10% by mass or less, more preferably 0% by mass, based on all structural units constituting the ethylene/vinyl acetate copolymer.

The melt flow rate (JIS K7210-1999, 190° C., 2160 g load) of the ethylene/vinyl acetate copolymer is preferably 1 to 20 g/10 minutes. When the MFR of the ethylene-vinyl acetate copolymer is within the above range, it is easy to maintain sheet formability. More preferably, the MFR of the ethylene/vinyl acetate copolymer is 5 to 15 g/10 minutes.

〔silicone rubber〕
The silicone rubber is not particularly limited, and may be a cured product of an addition reaction-curable or condensation-curable silicone rubber composition.

The cured product of the addition reaction-curable silicone rubber composition is a silicone rubber composition containing a polyorganosiloxane having two or more alkenyl groups (preferably vinyl groups) in one molecule as a crosslinkable reactive group, and a curing agent. can be obtained by curing (addition curing).

The polyorganosiloxane having two or more alkenyl groups (preferably vinyl groups) in one molecule as a crosslinkable reactive group is preferably an organopolysiloxane represented by the following formula (1).
RnSiO _{(4-n)/2 (} 1)

In formula (1), each R is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms. However, at least two of the plurality of R are alkenyl groups (preferably vinyl groups). Examples of monovalent hydrocarbon groups include alkyl groups having 1 to 8 carbon atoms, cycloalkyl groups, alkenyl groups, cycloalkenyl groups, aryl groups, aralkyl groups, and at least part of the hydrogen atoms of these groups are halogen atoms. etc., preferably a methyl group, a vinyl group, a phenyl group, or a trifluoropropyl group, more preferably a methyl group. Multiple R's may be the same or different. n is a positive number between 1.95 and 2.05.

The curing agent (crosslinker) can be an addition reaction curing agent. Addition reaction curing agents can be silane compounds such as organohydrogenpolysiloxanes.

The silicone rubber composition may further contain a reaction catalyst, silicone oil, etc., if necessary. Reaction catalysts include platinum-based catalysts such as platinum metal particles, platinic chloride, and chloroplatinic acid. Silicone oil is a liquid silicone oil having polyorganosiloxane as a main skeleton, examples thereof include dimethyl silicone oil having only methyl groups as organo groups; modified silicone oils substituted with groups, aralkyl groups, amino groups, carboxyl groups, epoxy groups, hydroxyl groups, polyoxyalkylene groups, and the like. The total amount of these components can be 10% by mass or less based on the total solid content of the silicone rubber composition.

The cured product of the condensation-curable silicone rubber composition comprises a polydiorganopolysiloxane having two or more hydroxyl-bonded silicon atoms per molecule, a silane compound having three or more condensable functional groups per molecule, It can be obtained by curing (condensation curing) a silicone rubber composition containing a condensation catalyst.

A diorganopolysiloxane having two or more hydroxyl-bonded silicon atoms in one molecule is an organic group bonded to a Si atom, for example, an alkyl group such as a methyl group or an ethyl group; an aryl group such as a phenyl group or a tolyl group; Included are diorganopolysiloxanes which are cycloalkyl groups such as cyclohexyl groups.

The silane compound is a polyfunctional silane compound having a hydrolyzable group, and is preferably a silane compound represented by the following general formula (2).
(R ₁ )mSiXn (2)
(wherein R ₁ represents a methyl group, a vinyl group or a phenyl group; X represents an alkoxy group having 1 to 5 carbon atoms, a methylethylketoxime group, a propenyloxy group or an acetoxy group; m represents 0 or 1; n represents 3 or 4. However, when m is 0, n is 4, and when m is 1, n is 3.).

Examples of condensation catalysts include titanium compounds such as tetraisopropoxytitanium, tetra-n-butoxytitanium.

Examples of silicone rubber compositions include Shin-Etsu Chemical Co., Ltd. S Coat 57 and the like.

Among these, the resin constituting the coating layer 13 is preferably an ethylene-vinyl acetate copolymer because it is easy to obtain non-adhesiveness to the caulking material.

In addition, the composition of the coating layer 13 is not limited to these. For example, even if a resin (for example, polyethylene or polypropylene) whose volume resistivity does not satisfy the above range is combined with a conductive material such as carbon black, the coating layer 13 as a whole can have the volume resistivity and surface free energy above the above range. You may make it satisfy|fill the range of.

[Other ingredients]
The coating layer 13 may further contain components other than the resins described above within a range that does not impair the effects of the present invention. Examples of other ingredients include slip agents, colored pigments, extenders and aggregates.

The slip agent (lubricant) is not particularly limited as long as it can further improve the non-adhesiveness of the coating layer to the caulking material.

Examples of slip agents include:
Waxes such as natural waxes such as natural paraffin and carnauba wax, and polyolefin waxes such as synthetic paraffin and polyethylene;
Natural and synthetic oils such as aromatic, naphthenic, paraffinic mineral oils, vegetable oils, silicone oils;
Higher fatty acids such as caprines, lauric acid, myristic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, behenic acid, or metal salts thereof;
fatty alcohols such as palmityl alcohol, cetyl alcohol, stearyl alcohol;
Fatty acid amides such as caproamide, caprylic acid amide, capric acid amide, lauric acid amide, myristic acid amide, palmitic acid amide, stearic acid amide;
Esters such as alcohol esters of fatty acids;
fluoroalkylcarboxylic acid or metal salt thereof;
Fluorine compounds such as fluoroalkylsulfonic acid metal salts are included. Among these, fatty acid amides are preferable from the viewpoint that they have a surface-modifying effect even when blended in a small amount, and that the non-adhesiveness of the coating layer to the caulking material can be easily increased.

The content of the slip agent is, for example, 3 to 30% by mass, preferably 7 to 30% by mass, based on the resin. When the content of the slip agent is 7% by mass or more, the non-adhesiveness of the coating layer 13 to the caulking material is likely to be further enhanced, and when the content is 30% by mass or less, the adhesiveness to the metal plate is less likely to be impaired.

Examples of colored pigments include inorganic pigments such as titanium oxide, calcium carbonate, carbon black, iron black, titanium yellow, red iron oxide, Prussian blue, cobalt blue, cerulean blue, ultramarine blue, cobalt green, molybdenum red; CoAl, CoCrAl, CoCrZnMgAl, Composite oxide baked pigments containing metal components such as CoNiZnTi, CoCrZnTi, NiSbTi, CrSbTi, FeCrZnNi, MnSbTi, FeCr, FeCrNi, FeNi, FeCrNiMn, CoCr, Mn, Co, SnZnTi; Metallic pigments such as Al, resin coating Al, Ni and Risole Red B, Brilliant Scarlet G, Pigment Scarlet 3B, Brilliant Carmine 6B, Lake Red C, Lake Red D, Permanent Red 4R, Bordeaux 10B, Fast Yellow G, Fast Yellow 10G, Para Red, Watching Red, Benzidine Yellow, Organic pigments such as Benzidine Orange, Bonmaroon L, Bonmaroon M, Brilliant Fast Scarlet, Vermillion Red, Phthalocyanine Blow, Phthalocyanine Green, Fast Sky Blue, and Aniline Black are included. Examples of extender pigments include barium sulfate, titanium oxide, silica, calcium carbonate. Examples of aggregates include resin particles; inorganic particles made of inorganic compounds such as glass, silicon carbide, boron nitride, zirconia, alumina and silica. Moreover, when the coating layer 13 contains silicone rubber, it may contain other components such as silicone oil. The total amount of these other components can be 10 mass % or less with respect to the coating layer 13 .

The thickness of the coating layer 13 is not particularly limited as long as it maintains non-adhesiveness to the caulking material when used as a joiner, but is preferably 3 to 120 μm. When the thickness of the coating layer 13 is 3 μm or more, it is easy to maintain good non-adhesiveness to the caulking material when used as a joiner. It is easy to suppress poor appearance of the coated metal plate 10 due to popping during drying. From the above viewpoint, the thickness of the coating layer 13 is more preferably 5 to 100 μm.

(other layers)
The coated metal plate 10 of the present invention may further have other layers (not shown) such as a primer coating film and an adhesive layer between the metal plate 11 and the coating layer 13, if necessary.

[Undercoat film]
The primer coating film can be placed on the surface of the metal plate or the chemical conversion coating. The undercoat film can improve the adhesion of the coating layer and the corrosion resistance of the coated metal plate.

The type of resin (base resin) that constitutes the undercoat film is not particularly limited. Examples of resins constituting the undercoat film include epoxy resins, acrylic resins, polyester resins, and the like. The undercoat film may further contain an aggregate, an antirust pigment, and the like, if necessary. Such an undercoat film can be formed by applying an undercoat paint on a metal plate and then baking it at 200 to 250° C. for 30 to 120 seconds.

[Adhesive layer]
The adhesive layer is not particularly limited, but may be a cured product of a thermosetting adhesive such as a melamine-based adhesive or an epoxy-based adhesive, or various elastomer-based adhesives.

2. Method for Producing Covered Metal Sheet The covered metal sheet of the present invention can be produced by any method. The coated metal plate 10 of the present invention may be obtained, for example, by laminating a film as the resin composition for the coating layer on the metal plate 11 and then thermocompression bonding (thermal lamination) to form the coating layer 13 . (thermocompression method); the film may be laminated on the metal plate 11 via an adhesive to form the coating layer 13 (adhesion method); The coating layer 13 may be obtained by casting a melt of the resin composition for coating and then cooling to form the coating layer 13 (extrusion casting method); After that, it may be obtained by drying or heating to form the coating layer 13 (coating method).

For example, the coating layer 13 containing an ethylene/vinyl acetate copolymer is formed by thermocompression bonding a film containing an ethylene/vinyl acetate copolymer onto the metal plate 11 (thermocompression method), or It can be formed by melt-casting the coating layer resin composition including coalescence and then cooling (extrusion casting method). The thermocompression bonding conditions in the thermocompression bonding method are not particularly limited, but can be, for example, 100 to 200°C.

The coating layer 13 containing silicone rubber can be formed by coating the metal plate 11 with the resin composition for coating layer containing the aforementioned silicone-based coating composition, followed by drying at room temperature or curing under heat. The coating method of the coating layer resin composition is not particularly limited, but may be, for example, a roll coating method, a flow coating method, a curtain flow method, or a spray method. The heat-curing conditions may be such that the reaction-curable silicone rubber in the coating layer resin composition is sufficiently cured, and may be, for example, 25 to 300°C.

The coating layer 13 may be disposed on the entire surface of the metal plate 11, or only on a portion (the top surface 21A of the protruding portion 21 described later) that serves as a receiving portion for the caulking material when used as a joiner 20 described later. may be placed in Such a coated metal plate can be preferably used, for example, as a coated metal plate for joiners.

3. Joiner The joiner of the present invention is a joiner (joint material) to be arranged in joints of adjacent exterior materials, and has the coated metal plate of the present invention.

FIG. 2 is a partial perspective view showing an example of how the joiner 20 is used. 3A and 3B are cross-sectional views showing configuration examples of the joiner 20. FIG.

As shown in FIG. 2, the joiner 20 has a coated metal plate 10 with a hat-shaped cross section. Such a joiner 20 is also called a hat joiner. The joiner 20 has a ridge portion 21 and two substrate portions 23 connected to the base ends of the ridge portion 21 . The protruding portion 21 is arranged at the joint portion 30 of the building exterior and can support the caulking material 40 (can be a receiving portion for the caulking material 40). The two substrate portions 23 can maintain the distance between the ends of the two adjacent exterior materials 50 (the width of the joint portion 30) at a constant distance.

Of the surfaces of the joiner 20, the coating layer 13 may be arranged at least on the surface (top surface) 21A of the protruding portion 21 that is in contact with the caulking material. That is, the coating layer 13 may be arranged on the entire surface of the joiner 20 (see FIG. 3A), or may be arranged only on the surface (top surface) 21A of the protruding portion 21 that supports the caulking material. (See Figure 3B).

Joiner 20 can be manufactured in any manner. For example, the joiner 20 may be obtained by molding the coated metal plate 10 having the metal plate 11 and the coating layer 13 by press working or the like; It may be obtained by forming the coating layer 13 on the top surface 21</b>A of the strip portion 21 .

When the coating layer 13 is formed on the top surface 21A of the protruding portion 21 after forming the metal plate 11 by press working or the like, the coating layer 13 can be formed using, for example, a bond breaker tape described later.

4. Bond Breaker Tape FIG. 4 is a cross-sectional view showing the structure of the bond breaker tape 60. As shown in FIG.

As shown in FIG. 4 , the bond breaker tape 60 has a release film 61 , an adhesive layer 62 and a coating layer 13 .

(Release film 61)
The release film 61 protects the adhesive layer 62 and is peeled off during use. The release film 61 is not particularly limited, but may be, for example, a known resin film such as a polyester film.

(Adhesive layer 62)
The adhesive layer 62 is made of an adhesive composition containing an adhesive. Examples of adhesives include acrylic adhesives, vinyl ether adhesives, silicone adhesives, and rubber adhesives.

The adhesive composition may further contain various additives other than the adhesive. Examples of such additives include cross-linking agents, tackifiers, plasticizers, fillers, anti-aging agents, etc., depending on the type of adhesive.

The thickness of the adhesive layer 62 may be such that the coating layer 13 can be satisfactorily fixed to the predetermined region of the metal plate 11 (the region that becomes the top surface 21A of the ridge 21 of the joiner 20), for example, 10 to 100 μm. can be

(Coating layer 13)
The composition, thickness, etc. of the coating layer 13 are the same as described above.

(other layers)
The bond breaker tape 60 of the present invention may further have a second release film (not shown) that protects other layers, such as the coating layer 13, as needed. The second release film can also be the same as the release film 61 described above.

The bond breaker tape 60 can be produced, for example, by coating a release film 61 with an adhesive composition to form an adhesive layer 62 and then laminating the coating layer 13 thereon.

Such bond breaker tape 60 can be used, for example, as follows. That is, the release film 61 is peeled off from the bond breaker tape 60 . Next, the exposed adhesive layer 62 is placed on the surface of the molded metal plate 11 on which the caulking material is placed (the surface that will become the top surface 21A of the protruding portion 21 of the joiner 20). Then, by further peeling off the second release film, the coating layer 13 can be formed on the surface of the ridges.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited by these examples.

1-1. Preparation of coating layer materials (films 1-7)
Pellets of the ethylene/vinyl acetate copolymer having the vinyl acetate content shown in Table 1 were set in a pressing machine, and pressure-molded while heating at the melting temperature of the ethylene/vinyl acetate copolymer +30°C. , Films 1 to 7 having a thickness of 50 μm and made of an ethylene/vinyl acetate copolymer were obtained.

The compositions of films 1-7 are shown in Table 1.

Among them, the melt flow rate (JIS K7210-1999, 190° C., 2160 g load) of Film 3 was 9.0 g/10 minutes.

(Films 8-13)
Film 8: Polystyrene film (PS) (manufactured by Asahi Kasei Chemicals, OPS (registered trademark) film, thickness 50 μm)
Film 9: High-density polyethylene film (HDPE) (manufactured by Nitto L Material Co., Ltd., polyethylene masker, thickness 10 μm)
Film 10: Polyvinylidene chloride film (PVdC) (manufactured by Asahi Kasei Corporation, Saran (registered trademark) UB, thickness 25 μm)
Film 11: polypropylene film (PP) (manufactured by Toray Advanced Film Co., Ltd., Torayfan (registered trademark) NO, thickness 50 μm)
Film 12: Polymethyl methacrylate film (PMMA) (manufactured by Mitsubishi Chemical Corporation, Acryprene TM, thickness 50 μm)
Film 13: Polycarbonate film (PC) (manufactured by Teijin, Pure Ace (registered trademark), thickness 100 μm)

(Paint 1-3)
Paint 1: Silicone paint (manufactured by Shin-Etsu Chemical Co., Ltd., silicone rubber S coat 57)
Paint 2: Silicone paint (manufactured by Shin-Etsu Chemical Co., Ltd., silicone resin KR-300)
Paint 3: Epoxy resin-based paint: Nippe Powerbind manufactured by Nippon Paint Industrial Coatings Co., Ltd.

1-2. Fabrication and evaluation of coated metal sheets (preparation of chemically treated metal sheets)
A 0.35 μm-thick molten 55% Al-45% Zn alloy-plated steel sheet (coating amount on both sides: 150 g/m ² ) was prepared as a coating base plate (metal plate).
This plated steel sheet was degreased with alkali. Next, a coating type chromate treatment solution (Surf Coat NRC300, manufactured by Nippon Paint Co., Ltd.) is applied to the surface of the obtained plated steel sheet as a pretreatment for painting, and heated at a reaching temperature of 100 ° C., so that the total chromium conversion adhesion amount is A chemical conversion treatment film of 40 mg/m ² was formed to obtain a chemical conversion treatment metal sheet.

(Preparation of coated metal plates 1 to 4 and 8 to 10)
After placing the film shown in Table 2 on the chemical conversion film of the obtained chemically treated metal plate and temporarily bonding the ethylene-vinyl acetate copolymer at the glass transition temperature (Tg) + 40°C by a heat lamination method. Then, they were heated in an oven at a glass transition temperature (Tg) of +80° C. for 60 seconds to form coating layers having a thickness of 50 μm to obtain coated metal plates 1-4 and 8-10.

(Preparation of coated metal plate 5)
After coating the coating shown in Table 2 on the chemical conversion film of the obtained chemically treated metal plate, it was dried at room temperature for 1 week to form a coating layer having a thickness of 100 μm, and a coated metal plate 5 was obtained. .

(Preparation of coated metal plate 11)
After coating the coating shown in Table 2 on the chemical conversion coating film of the obtained chemical conversion treated metal plate, the coated metal plate 11 was obtained by heating at 300° C. to form a coating layer having a thickness of 5 μm.

(Production of coated metal plates 6, 12, 14)
Coated metal plates 6, 12 and 14 were obtained in the same manner as the coated metal plate 1, except that the ethylene-vinyl acetate copolymer film 1 was changed to the film shown in Table 2. The thermal lamination (temporary adhesion) was performed at the glass transition temperature (Tg) of the resin +40°C, and the heating in the oven was performed at the glass transition temperature (Tg) of the resin +80°C.

(Preparation of coated metal plates 7, 13, 15)
Film 9, 11 or 13 was adhered onto the chemical conversion film of the obtained chemically treated metal plate via an adhesive to obtain coated metal plate 7, 13 or 15.

(Preparation of coated metal plate 16)
After coating the coating shown in Table 2 on the chemical conversion film of the obtained chemically treated metal plate, the coated metal plate 16 was obtained by heating at 200° C. to form a coating layer having a thickness of 5 μm.

The volume resistivity and surface free energy of the coating layers of the obtained coated metal sheets 1 to 16 were measured by the following methods.

(volume resistivity)
The volume resistivity of the coating layer was measured according to JIS C 2139:2008 "Solid electrical insulating material-Method for measuring volume resistivity and surface resistivity". Measurement was performed under the following conditions.
(Test condition)
Test equipment: Digital ultra-high resistance/micro current meter 8340A type (manufactured by ADC)
Electrode size: main electrode 50mmφ, guard electrode inner diameter 60mmφ, outer diameter 80mmφ
Applied voltage: 100V, 500V (DC)
Application time: 60 sec
Test environment: temperature 23±2°C, humidity 50±5% RH
Test piece size: 100mm x 100mm
Number of tests: n=3

(Surface free energy)
The contact angles of pure water and methylene iodide were measured according to JIS R 3257:1999 "Method for testing wettability of substrate glass surface". Measurement was performed using a portable contact angle meter PCA-1 (manufactured by Kyowa Interface Science Co., Ltd.). The surface free energy was calculated using the obtained contact angle value and the Kaelble-Uy formula.

Furthermore, the non-adhesiveness of the coated metal plates 1 to 16 after exposure to the caulking material was measured by the following method.

(Non-adhesion to caulking material)
The obtained coated metal plate was exposed to the outdoors for 2 weeks in conformity with JIS Z 2381, with an exposure angle of 35 degrees and an installation direction facing south. A primer for caulking material was applied with a brush to the coated metal plate after exposure to the outdoors, and dried at room temperature for 30 minutes. Next, a caulking material was applied to the surface of the primer and dried at normal temperature for one week.
The dried caulking material was peeled off from the coated metal plate by hand, and was evaluated as "◯" when it was completely peeled off easily, and as "X" when it was not (mostly) peeled off.
As the caulking material, a one-component modified silicone caulking material (SR Seal S70; Sunrise MSI Co., Ltd.) or a urethane caulking material (FC700; Nichiha Co., Ltd.) was used. In addition, the reason why the primer was applied is that the primer is often applied unintentionally to the surface that receives the caulking material during actual construction, so that the conditions are close to the actual construction conditions. is.

Table 2 shows the evaluation results of the coated metal plates 1 to 16.

As shown in Table 2, coated metal plates 1 to 5 having a coating layer with a volume resistivity of 1.0×10 ¹⁷ Ω·cm or less and a surface free energy of 36.6 mJ/m ² or less , good non-adhesiveness after exposure to both the urethane-based caulking material and the silicone-based caulking material.

On the other hand, the coated metal plates 6 to 16 having a coating layer in which at least one of the volume resistivity and the surface free energy is outside the range of the present application are exposed to both the urethane-based caulking material and the silicone-based caulking material. It can be seen that the subsequent non-adhesiveness is low.

2-1. Preparation of material for covering layer (films 14-18)
Pellets containing 100 parts by mass of an ethylene-vinyl acetate copolymer (vinyl acetate content: 8% by mass) and stearic acid amide in the amount shown in Table 3 as a slip agent were kneaded in a kneader, and then extruded in a press. It was set in between and pressure-molded while heating at the melting temperature of the ethylene/vinyl acetate copolymer +30° C. to obtain films 14 to 18 having a thickness of 50 μm.

2-2. Production and evaluation of coated metal plates (Production of coated metal plates 17 to 21)
Coated metal plates 17 to 21 were obtained in the same manner as the coated metal plate 2, except that the ethylene-vinyl acetate copolymer film 2 was changed to the film shown in Table 4.

(volume resistivity, surface free energy)
The volume resistivity and surface free energy of the coating layers of the obtained coated metal plates 17 to 21 were measured in the same manner as described above.

(Non-adhesion to caulking material)
The non-adhesiveness of the obtained coated metal plates 17 to 21 to the caulking material was measured in the same manner as described above, except that the outdoor exposure time was changed to one month.
Then, the dry caulking material was peeled off from the coated metal plate by hand, and "◎" indicates that it was completely peeled off easily. It was evaluated as "○".

Table 4 shows the evaluation results of the coated metal plates 17 to 21.

As shown in Table 4, it can be seen that the non-adhesiveness to the caulking material can be maintained for a longer period of time when the slip agent is further included.

According to the present invention, it is possible to provide a coated metal sheet that maintains non-adhesiveness to a caulking material even after being left outdoors. Such a coated metal plate can maintain good non-adhesiveness to a caulking material, and is suitable as a joiner capable of suppressing three-sided adhesion.

REFERENCE SIGNS LIST 10 coated metal plate 11 metal plate 13 coating layer 20 joiner 21 protruding portion 21A top surface 23 substrate portion 30 joint portion 40 caulking material 50 exterior material 60 bond breaker tape 61 release film 62 adhesive layer

Claims (12)

a metal plate;
a coating layer containing an ethylene-vinyl acetate copolymer disposed on the surface of the metal plate;
has
The coating layer has a volume resistivity of 1.0×10 ¹⁷ Ω·cm or less as measured in accordance with JIS C 2139:2008, and a contact angle measured in accordance with JISR 3257:1999. The surface free energy calculated from the Kaelble-Uy formula is 36.6 mJ / m ² or less,
Coated metal plate. The content ratio of structural units derived from vinyl acetate in the ethylene/vinyl acetate copolymer is 5% by mass or more and less than 20% by mass with respect to all structural units constituting the ethylene/vinyl acetate copolymer.
The coated metal sheet according to claim 1 . The coating layer further comprises a slip agent,
The coated metal sheet according to claim 1 or 2 . The thickness of the coating layer is 3 to 120 μm,
The coated metal sheet according to any one of claims 1-3 . The metal plate has a chemical conversion coating disposed on the surface on which the coating layer is disposed,
The coated metal sheet according to any one of claims 1-4 . Having the coated metal plate according to any one of claims 1 to 5 for being arranged in the joint part of adjacent exterior materials,
Joiner. The joiner has a ridge portion and a substrate portion connected to the base end portion of the ridge portion,
The coating layer is arranged at least on the surface for supporting the caulking material of the ridges,
A joiner according to claim 6 . Having a coated metal plate to be arranged in the joint part of the adjacent exterior materials,
The coated metal plate is
a metal plate;
a resin-containing coating layer disposed on the surface of the metal plate;
has
The coating layer has a volume resistivity of 1.0×10 ¹⁷ Ω·cm or less as measured in accordance with JIS C 2139:2008, and a contact angle measured in accordance with JISR 3257:1999. The surface free energy calculated from the Kaelble-Uy formula is 36.6 mJ / m ² or less,
Joiner . The joiner has a ridge portion and a substrate portion connected to the base end portion of the ridge portion,
The coating layer is arranged at least on the surface for supporting the caulking material of the ridges,
A joiner according to claim 8 . Having a release film, an adhesive layer, and a coating layer in this order,
The coating layer contains a resin, and has a volume resistivity of 1.0×10 ¹⁷ Ω·cm or less as measured in accordance with JIS C 2139:2008, and conforms to JISR 3257:1999. The surface free energy calculated from the Kaelble-Uy formula based on the contact angle measured in accordance with is 36.6 mJ / m ² or less,
bond breaker tape. The resin is an ethylene/vinyl acetate copolymer,
11. The bond breaker tape of claim 10. The resin is silicone rubber,
11. The bond breaker tape of claim 10.

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