TWI809072B - Coated metal plate, adapter having same and anti-adhesive tape - Google Patents

Abstract

The coated metal sheet of the present invention has a metal sheet and a coating layer which is arranged on the surface and contains a resin. The volume resistivity of the coating layer measured in accordance with JIS C 2139:2008 is 1.0×10 ¹⁷ Ω·cm or less, and the surface free energy calculated based on the contact angle measured in accordance with JIS R 3257:1999 is 36.6 mJ/m ² the following.

Description

Coated metal plate, adapter having same and anti-adhesive tape

The invention relates to a clad metal plate, an adapter with it and an anti-bonding tape.

The adapter is used for the seams between the outer packaging panels in the outer packaging of buildings. The adapter has a function of holding the outer packaging board at a constant interval.

The joints between the outer packaging boards are filled with gap filling materials to ensure waterproof and airtightness. At this time, if the caulking material and the side end surfaces of the two outer packaging panels are three-sidedly bonded to the adapter, the outer packaging panels will expand and contract according to changes in the external environment (especially temperature changes), so the caulking material cannot follow the outer packaging. The expansion and contraction of the board, the stress generated by the expansion and contraction of the outer packaging board concentrates on the gap material, causing the gap material to break easily.

In order to solve such a problem, the caulking material is bonded to the side end surfaces of two adjacent outer packaging panels, but is not bonded to the adapter, that is, bonded on both sides.

As a method of performing double-sided bonding, a method of forming a coating film having low adhesion to the caulk material on the surface of the adapter in contact with the caulk material (the receiving portion of the caulk material) has been studied. For example, an adapter having a coating film containing a specific fluororesin on a surface in contact with a caulking material (refer to Patent Document 1) or an adapter having a coating film containing low-density polyethylene or polypropylene (refer to Patent Document 1) is disclosed. Document 2). In addition, it discloses a polyolefin containing polyethylene and the like and adjusts the adhesive force and tensile strength to the specified The three sides of the range are followed by anti-adhesive tape (for example, patent document 3).

[Prior art literature]

[Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2009-62707

[Patent Document 2] Japanese Patent Laid-Open No. 2004-68464

[Patent Document 3] Japanese Patent Laid-Open No. 2004-108011

However, the adapter may be left outdoors after being brought into the construction site until construction of the building exterior is performed. During this period, the surface of the adapter that is in contact with the caulking material is likely to adhere to the caulking material, and there is a problem of three-sided adhesion during construction of the building exterior. The same problem also occurs with the splicers shown in Patent Document 1 and Patent Document 2, or the splicer obtained by using the adhesive tape of Patent Document 3.

The present invention is made in view of the above circumstances, and an object of the present invention is to provide a coated metal plate capable of maintaining low adhesion to a caulking material even after being placed outdoors, an adapter having the same, and an anti-adhesion tape.

The present invention relates to a coated metal plate having the following configuration, a joint using the same, and an anti-adhesion tape.

[1] A coated metal sheet comprising: a metal sheet; and a coating layer disposed on the surface of the metal sheet and containing a resin, the coating layer conforming to Japanese Industrial Standards (JIS) C 2139:2008 The measured volume resistivity was 1.0×10 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.

[2] The coated metal sheet as described in [1], wherein the resin is ethylene. Vinyl acetate copolymer.

[3] The coated metal sheet according to [1], wherein the resin is silicone rubber.

[4] The coated metal sheet as described in [2], wherein relative to the composition of the ethylene. All structural units of vinyl acetate copolymer, the ethylene. The content rate of the vinyl acetate-derived structural unit of a vinyl acetate copolymer is 5 mass % or more and less than 20 mass %.

[5] The coated metal sheet as described in 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 μm to 120 μm.

[7] The coated metal sheet according to any one of [1] to [6], wherein the metal sheet has a chemical conversion treatment film arranged on the surface on which the coating layer is arranged.

[8] An adapter configured to be disposed at a seam portion of adjacent outer packaging materials and having the coated metal sheet according to any one of [1] to [7].

[9] The adapter according to [8], wherein the adapter has a ridge portion, and a base portion connected to a base end portion of the ridge portion, and at least one of the ridge portions is used for The surface supporting the gap filler is provided with the covering layer.

[10] An anti-adhesive tape having a release film, an adhesive layer, and a coating layer in this order, the coating layer comprising a resin, and the volume resistivity of the coating layer measured in accordance with JIS C 2139:2008 is 1.0 ×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.

[11] The anti-adhesive tape as described in [10], wherein the resin is ethylene. Vinyl acetate copolymer.

[12] The anti-adhesive tape as described in [10], wherein the resin is silicone rubber.

According to the present invention, it is possible to provide a coated metal plate capable of maintaining non-adhesion to a caulking material even after being placed outdoors, an adapter having the same, and an anti-adhesion tape.

10: Coated metal plate

11: metal plate

13: Coating layer

20: Adapter

21: convex part

21A: top surface

23: Substrate part

30: seam

40: gap filling material

50: Outer packing materials

60: Anti-adhesive tape

61: Release film

62: Adhesive layer

Fig. 1 is a cross-sectional view showing a configuration example of a clad metal sheet according to the present embodiment.

Fig. 2 is a partial perspective view showing an example of a state of use of the adapter.

3A and 3B are cross-sectional views of the adapter.

Fig. 4 is a cross-sectional view of the anti-adhesive tape.

The inventors of the present invention analyzed and studied the reason why the conventional adapter shown in Patent Document 1 or Patent Document 2 is easily bonded to the caulking material after being placed outdoors. As a result, although the details are not clear, it is inferred that the following Phenomenon.

That is, it is considered that during the period when the adapter is placed outdoors, the Contamination such as dust or dust adheres (flies) to the coating film, and the contamination is fixed by outdoor light, moisture, heat, or the like. Furthermore, it is considered that the stuck dirt becomes a starting point, and the caulk is easily adhered.

That is, in order to maintain non-adhesion to the caulking material, it is effective to maintain a surface state that makes it difficult for dirt to adhere, so it is considered effective to 1) reduce the chargeability of the coating film surface, and 2) reduce the of surface energy. Furthermore, the inventors of the present invention have studied various materials and found that, specifically, if 1) the volume resistivity measured in accordance with JIS C 2139:2008 is 1.0×10 ¹⁷ Ω. cm or less, and 2) based on the contact angle measured in accordance with JIS R 3257: 1999, the surface free energy calculated according to the Kaelble-Uy formula is 36.6 mJ/m ^or less, the dirt is difficult to fix, Maintains non-adhesion to gap filler.

It was further found that ethylene in materials satisfying these physical properties. Vinyl acetate copolymers are commonly used materials for sealants and adhesive applications, but when placed outdoors, it is particularly difficult for dirt to adhere to the surface of the coating film, and it can maintain good non-adhesion with caulking materials. The present invention is based on such knowledge.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1. Coated metal plate

FIG. 1 is a cross-sectional view showing the configuration of a clad metal sheet according to the present embodiment.

As shown in FIG. 1 , the covered metal plate 10 of this embodiment has a metal plate 11 and a coating layer 13 arranged on the surface thereof.

(metal plate 11)

The metal plate 11 as a coating original plate can be suitably selected according to the use of a coating metal plate. In the example of the metal plate 11, include coated steel sheets such as galvanized steel sheets, Zn-Al alloy-plated steel sheets, Zn-Al-Mg alloy-plated steel sheets, and aluminum-plated steel sheets; Steel plates such as austenite, martensite, ferrite, ferrite-martensite two-phase system); aluminum plate; aluminum alloy plate; and copper plate. Among them, the metal plate 11 is preferably a plated steel sheet, more preferably a hot-dip steel plate, from the viewpoint of improving corrosion resistance. The amount of plating deposited on the plated steel sheet is not particularly limited, and may be, for example, 30 g/m ² to 500 g/m ² .

From the viewpoint of improving the corrosion resistance of the coated steel sheet and the adhesion of the coating film, the surface of the metal plate 11 may be subjected to chemical conversion treatment. The type of chemical conversion treatment is not particularly limited, and 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 can be set according to the application or workability. For example, from the viewpoint of obtaining the required workability or mechanical strength when making the adapter, it is preferably 0.3 mm to 0.6 mm. mm.

The chemical conversion treatment can be implemented by a known method. For example, the chemical conversion treatment solution may be applied to the surface of the steel sheet by roll coating, spin coating, or spraying, and then dried without washing with water. The drying temperature and drying time are not particularly limited as long as moisture can be evaporated. From the viewpoint of productivity, the drying temperature is preferably in the range of 60° C. to 150° C. with a plate thermometer, and the drying time is preferably in the range of 2 seconds to 10 seconds. The deposition amount of the chemical conversion treatment film is not particularly limited as long as it is within a range effective for improving corrosion resistance and coating film adhesion. For example, in the case of a chromate film, the amount of adhesion may be adjusted so that the amount of adhesion in terms of total Cr becomes 5 mg/m ² to 100 mg/m ² . In addition, in the case of a chromium-free film, if it is a titanium-molybdenum composite film, it is only necessary to adjust the deposition amount so that the deposition amount of the film falls within the range of 10 mg/m ² to 500 mg/m ² . For the acid-based film, the amount of adhesion may be adjusted so that the amount of adhesion in terms of fluorine or in terms of total metal elements falls within the range of 3 mg/m ² to 100 mg/m ² . In addition, in the case of a phosphate film, the amount of adhesion of the film may be adjusted so that the amount of adhesion of the film becomes 5 mg/m ² to 500 mg/m ² .

(coating layer 13)

The coating layer 13 is a layer (resin layer) which is arranged on at least a part of the surface of the metal plate 11 and contains a resin. The covering layer 13 becomes the outermost layer of the covering metal plate 10 . From the viewpoint of maintaining non-adhesion with the interstitial material, the coating layer 13 can be adjusted to have a volume resistivity of 1.0×10 ¹⁷ Ω. cm or less, and the surface free energy is less than 36.6mJ/m ² .

If the volume resistivity of the covering 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 be generated, and dirt and the like are less likely to adhere during exposure to the outside. The volume resistivity of the covering layer 13 is more preferably 4.0×10 ¹⁶ Ω. below cm. The lower limit of the volume resistivity of the coating layer 13 is not particularly limited, for example, it may be 1.0×10 ¹² Ω. about cm.

The volume resistivity of the coating layer 13 can be measured in accordance with JIS C 2139:2008 "Solid electrical insulating material—Measurement method of volume resistivity and surface resistivity" (IEC 60093:1980). Specifically, it can be measured under the following conditions.

(Test conditions)

Test device: digital ultra-high resistance/micro ammeter 8340A type (manufactured by ADC Corporation)

Electrode size: main electrode 50mmΦ, guard electrode (guard electrode) inside Diameter 60mmΦ, outer diameter 80mmΦ

Applied voltage: 100V, 500V (DC)

Application time: 60sec

Test environment: temperature 23℃±2℃, humidity 50%RH±5%RH

Test piece size: 100mm×100mm

If the surface free energy of the coating layer 13 is 36.6 mJ/m ^or less, the reactivity of the surface of the coating layer 13 is low, so even if dirt adheres to the coating layer 13 during exposure to the outside, the reactivity of the surface is also low, Therefore, it is possible to make it difficult for dirt to fix. The surface free energy of the coating layer 13 is more preferably 34.2 mJ/m ² or less. The lower limit of the surface free energy of the coating layer 13 is not particularly limited, and may 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 in accordance with JIS R 3257:1999 (IEC62073). Specifically, it can be measured by the following procedures.

1) The contact angles of pure water and diiodomethane were measured in accordance with JIS R 3257: 1999 "Testing method for wettability of the surface of substrate glass". As a measurement device, a portable contact angle meter PCA-1 (manufactured by Kyowa Interface Science Co., Ltd.) can be used.

2) Using the obtained value of the contact angle, according to the Kaelble-Uy formula (γs=γs ^d +γs ^p , γs ^d : the dispersion component of the surface free energy, γs ^p : the polar component of the surface free energy) to calculate the surface free energy.

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

The resin constituting the coating layer 13 can be used as long as the volume resistivity and surface free energy Those who meet the above range are enough, there is no special limitation, it can be ethylene. Vinyl acetate copolymer, silicone rubber, etc.

[Ethylene. Vinyl acetate copolymer]

Vinyl. The vinyl acetate copolymer contains a structural unit derived from ethylene and a structural unit derived from vinyl acetate.

The content ratio of the structural unit derived from vinyl acetate should be such that it does not exhibit stickiness and can obtain low chargeability, relative to the constituent ethylene. The total structural units of the vinyl acetate copolymer are preferably at least 5% by mass and less than 20% by mass. When the content ratio of the structural unit derived from vinyl acetate is 5% by mass or more, low volume resistivity and thus low chargeability are easily obtained, making it difficult for dirt to adhere to the surface of the coating layer 13 . If the content ratio of the structural unit derived from vinyl acetate is less than 20% by mass, it is difficult to express stickiness, so that it is difficult for dirt to adhere to the surface of the coating layer 13 . Relative to the formation of ethylene. As for all the structural units of the vinyl acetate copolymer, the content ratio of the structural unit derived from vinyl acetate is more preferably 5% by mass to 17% by mass.

Vinyl. The vinyl acetate copolymer may further contain structural units derived from other monomers than ethylene and vinyl acetate. Examples of other monomers include propylene, 1-butene, 3-methyl-1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1 α-olefins with 3 to 20 carbon atoms such as decene, or (meth)acrylic acid, (meth)acrylate, and styrene. Relative to the formation of ethylene. The content ratio of all structural units of the vinyl acetate copolymer and structural units derived from other monomers is preferably at most 10% by mass, more preferably 0% by mass.

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

〔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 hardened product of the addition reaction hardening type silicone rubber composition can contain polyorganosiloxane having two or more alkenyl groups (preferably vinyl groups) as crosslinkable reactive groups in one molecule, and a hardener It is obtained by hardening (addition hardening) the silicone rubber composition.

The polyorganosiloxane having two or more alkenyl groups (preferably vinyl groups) as crosslinkable reactive groups in one molecule is preferably a polyorganosiloxane represented by the following formula (1).

R _n SiO _(4-n)/2 . ． ． (1)

In the formula (1), R is respectively a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms. Wherein, at least two of the multiple R are alkenyl (preferably vinyl). Examples of the monovalent hydrocarbon group include an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, an aryl group, an aralkyl group, and at least a part of hydrogen atoms of these groups are substituted by halogen atoms, etc. The one formed is preferably methyl, vinyl, phenyl, or trifluoropropyl, more preferably methyl. A plurality of R may be the same as or different from each other. n is a positive number from 1.95 to 2.05.

The hardener (crosslinking agent) may be an addition reaction hardener. The addition reaction curing agent may be a silane compound such as organohydrogenpolysiloxane.

The silicone rubber composition may further include a reaction catalyst, silicone oil, etc. as needed. The reaction catalyst includes platinum-based catalysts such as platinum metal particles, platinum chloride, and chloroplatinic acid. Silicone oil is a liquid silicone oil with polyorganosiloxane as the main skeleton. Examples include dimethyl silicone oil with only methyl groups as organic groups; Modified silicone oil substituted with radicals, alkyl groups, aralkyl groups, amino groups, carboxyl groups, epoxy groups, hydroxyl groups, polyoxyalkylene groups, etc. The total amount of these components may be 10% by mass or less with respect to the total solid content of the silicone rubber composition.

The cured product of the condensation-curing silicone rubber composition can be composed of a diorganopolysiloxane having two or more silicon atoms bonded to hydroxyl groups in one molecule, and three or more condensable functional groups in one molecule. It is obtained by hardening (condensation hardening) the silane compound of the base and the silicone rubber composition of the condensation catalyst.

Diorganopolysiloxanes with silicon atoms bonded to two or more hydroxyl groups in one molecule include organic groups bonded to Si atoms, such as alkyl groups such as methyl and ethyl groups; aryl groups such as phenyl groups and tolyl groups ; Cyclohexyl and other cycloalkyl diorganopolysiloxanes.

The silane compound is a polyfunctional silane compound having a hydrolyzable group, preferably a silane compound represented by the following general formula (2).

(R ₁ )mSiXn. ． ． (2)

Preferably (wherein, _R represents methyl, vinyl or phenyl. X represents an alkoxy group, methyl ethyl ketoxime group, acryloxy group or acetyloxy group with 1 to 5 carbon numbers. m represents 0 or 1. n represents 3 or 4. Among them, when m is 0, n is 4, and when m is 1, n is 3) represents a silane compound.

Examples of the condensation catalyst include titanium compounds such as tetraisopropoxytitanium and tetra-n-butoxytitanium.

Examples of the silicone rubber composition include SCoat 57 manufactured by Shin-Etsu Chemical Co., Ltd. and the like.

Among these, the resin constituting the coating layer 13 is preferably ethylene in terms of easy acquisition of non-adhesion to the caulking material. Vinyl acetate copolymer.

In addition, the composition of the coating layer 13 is not limited to these. For example, even if it is a resin (such as polyethylene or polypropylene) whose volume resistivity does not satisfy the above-mentioned range, by combining it with a conductive material such as carbon black, the volume resistivity and surface free energy of the coating layer 13 as a whole can also satisfy the required range. the above range.

[other ingredients]

The coating layer 13 may further contain other components than the above-mentioned resin within the range that does not impair the effect of the present invention. Examples of other ingredients include slip agents or coloring pigments, extender pigments, aggregates.

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

Examples of slip agents include: Natural waxes such as natural paraffin wax and carnauba wax, or polyolefin waxes such as synthetic paraffin wax and polyethylene; natural and synthetic oils such as aromatic oils, naphthene oils, mineral oils of paraffin oils, vegetable oils, and silicone oils Oil; higher fatty acids such as capric acid, lauric acid, myristic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, behenic acid, or these metal salts; palmitic alcohol, cetyl alcohol (cetyl alcohol), stearyl alcohol and other aliphatic alcohols; amide caproate, amide caprylate, amide caprate, amide laurate, amide myristate, Fatty acid amides such as palmitic acid amide and stearic acid amide; esters such as alcohol esters of fatty acids; fluoroalkyl carboxylic acids or their metal salts; fluorine compounds such as fluoroalkyl sulfonic acid metal salts. Among them, fatty acid amide is preferable from the viewpoint of having a surface modifying effect with a small amount of preparation and further improving the non-adhesion between the coating layer and the interstitial material.

The content of the slip agent is, for example, 3% by mass to 30% by mass relative to the resin, preferably 7% by mass to 30% by mass. 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 improved, and when the content of the slip agent is 30% by mass or less, the adhesion to the metal plate is less likely to be impaired.

Examples of colored pigments include titanium oxide, calcium carbonate, carbon black, iron black, titanium yellow, colcothar, Prussian blue, cobalt blue, cerulean blue, ultramarine blue), cobalt green (cobalt green), molybdenum red and other inorganic pigments; composite oxides containing metal components such as CoAl, CoCrAl, CoCrZnMgAl, CoNiZnTi, CoCrZnTi, NiSbTi, CrSbTi, FeCrZnNi, MnSbTi, FeCr, FeCrNi, FeNi, FeCrNiMn, CoCr, Mn, Co, SnZnTi, etc. Calcined pigments; metallic pigments such as Al, resin-coated Al, Ni, etc.; and lithol red B (lithol red B), bright scarlet G (brilliant scarlet G), pigment scarlet 3B (pigment scarlet 3B) , bright carmine 6B (brilliant carmine 6B), lake red C (lake red C), lake red D, permanent red 4R (permanent red 4R), bordeaux 10B (bordeaux 10B), fast yellow G (fast yellow G ), fast yellow 10G, para red, watching red, benzidine yellow, benzidine orange, bon maroon L, maroon M, Brilliant fast scarlet, vermilion red, phthalocyanine blue, phthalocyanine green, fast sky blue, aniline black and other organic pigments . Examples of extender pigments include barium sulfate, titanium oxide, silica, and calcium carbonate. Examples of the aggregate include resin particles; or inorganic particles containing inorganic compounds such as glass, silicon carbide, boron nitride, zirconia, alumina, and silicon dioxide. In addition, when the coating layer 13 contains silicone rubber, silicone oil and the like may be contained as other components. The total amount of these other components can be set to 10% by 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 is used as a connector to maintain non-adhesion to the gap filler, but is preferably 3 μm to 120 μm. When the thickness of the coating layer 13 is 3 μm or more, it is easy to be good when used as a bonder. If it is 120 μm or less, for example, when the coating layer 13 is formed by coating, it is easy to suppress the coating metal sheet 10 caused by wrinkling during drying of the coating. The appearance is bad. From this point of view, the thickness of the coating layer 13 is more preferably 5 μm to 100 μm.

(other layers)

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

〔Primer coating film〕

The primer coating film can be placed on the surface of the metal plate or the chemical conversion treatment film. The primer coating film can improve the adhesion of the coating layer or the corrosion resistance of the coating metal sheet.

The kind of resin (matrix resin) constituting the primer coating film is not particularly limited. Examples of the resin constituting the primer coating film include epoxy resin, acrylic resin, polyester resin, and the like. The primer coating film may further contain aggregates, antirust pigments, and the like as necessary. Such an undercoat film can be formed by applying an undercoat on a metal plate, and then calcining at 200° C. to 250° C. for 30 seconds to 120 seconds.

〔the next layer〕

The adhesive layer is not particularly limited, and may be a hardened product of a thermosetting adhesive such as a melamine-based adhesive or an epoxy-based adhesive, or various elastic-based adhesives.

2. Manufacturing method of coated metal sheet

The coated metal sheet of the present invention can be produced by any method. The coated metal plate 10 of the present invention can be obtained, for example, by laminating a film of the resin composition for the coating layer on the metal plate 11, and then performing thermocompression bonding (thermal lamination) to form the coating layer 13 (thermocompression bonding method); It can also be obtained by laminating the film on the metal plate 11 via an adhesive to form the coating layer 13 (adhesive method); it is also possible to cast a melt of the resin composition for the coating layer on the metal plate 11 and then cool it to form the coating layer 13 or obtained by coating the resin composition for the coating layer on the metal plate 11 and then drying or heating to form the coating layer 13 (coating method).

For example, containing ethylene. Coating layer 13 of vinyl acetate copolymer can be used on the metal plate 11 thermocompression bonding containing ethylene. Vinyl acetate copolymer film (thermocompression bonding method), or make containing ethylene. The covering layer of the vinyl acetate copolymer is formed by melting and casting the resin composition and then cooling it (extrusion casting method). The thermocompression bonding conditions in the thermocompression bonding method are not particularly limited, and may be, for example, 100°C to 200°C.

In addition, the coating layer 13 including silicone rubber can be formed by coating the resin composition for coating layer including the silicone-based coating composition on the metal plate 11, followed by drying at room temperature or heating and curing. The coating method of the resin composition for a coating layer is not particularly limited, and examples thereof include roll coating, flow coating, curtain coating, and spraying. The heating and hardening conditions are sufficient as long as the reaction-curable silicone rubber in the coating layer resin composition is sufficiently hardened, and may be, for example, 25°C to 300°C.

The coating layer 13 may be arranged on the entire surface of the metal plate 11 or only on a portion (the top surface 21A of the protruding line portion 21 to be described later) which will be a receiving part of the caulk when the adapter 20 described later is manufactured. Such a covered metal sheet can be suitably used, for example, as a covered metal sheet for adapters.

3. Adapter

The adapter of the present invention is a joint used to be arranged at the seam of adjacent outer packaging materials. A joint (joint material) having the coated metal sheet of the present invention.

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

As shown in FIG. 2 , the adapter 20 has the coated metal plate 10 having a hat-shaped cross-sectional shape. This type of adapter 20 is also called a cap adapter. The adapter 20 has a protruding line portion 21 and two base plate portions 23 connected to base ends of the protruding line portion 21 . The protruding part 21 is arranged at the seam part 30 of the building exterior, and can support the caulking material 40 (can be a receiving part of the caulking material 40). The two substrate parts 23 can maintain the distance between the ends of the two adjacent outer packaging materials 50 (the width of the seam part 30 ) at a constant distance.

The coating layer 13 may be arranged on at least the surface (top surface) 21A of the protruding line portion 21 that is in contact with the caulking material among the surfaces of the adapter 20 . That is, the coating layer 13 may be disposed on the entire surface of the adapter 20 (see FIG. 3A ), or may be disposed only on the surface (top surface) 21A of the rib portion 21 that supports the caulking material (see FIG. 3B ).

The adapter 20 can be manufactured by any method. For example, the adapter 20 can be obtained by forming the covered metal plate 10 having the metal plate 11 and the covering layer 13 by pressing or the like; It is obtained by forming the coating layer 13 on the top surface 21A of the .

When the coating layer 13 is formed on the top surface 21A of the protruding line portion 21 after the metal plate 11 is formed by pressing or the like, the coating layer 13 can be formed using, for example, an anti-adhesion tape described later.

4. Anti-adhesive tape

FIG. 4 is a cross-sectional view showing the structure of the anti-adhesion tape 60 .

As shown in FIG. 4 , the anti-adhesion 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, and may be, for example, a known resin film such as a polyester film.

(adhesive layer 62)

The adhesive layer 62 contains an adhesive composition containing an adhesive. Examples of adhesives include acrylic adhesives, vinyl ether adhesives, silicon adhesives, and rubber adhesives.

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

The thickness of the adhesive layer 62 is sufficient as long as it can satisfactorily fix the covering layer 13 to a predetermined region of the metal plate 11 (the region serving as the top surface 21A of the rib portion 21 of the adapter 20), and may be set to, for example, 10 μm. ~100 μm.

(coating layer 13)

The composition, thickness, and the like of the coating layer 13 are the same as described above.

(other layers)

The adhesion release tape 60 of this invention may further have another layer, for example, the 2nd release film (not shown) which protects the coating layer 13 as needed. The same thing as the said release film 61 can also be used for a 2nd release film.

The release tape 60 can be manufactured, for example, by coating the adhesive composition on the release film 61 to form the adhesive layer 62 , and then laminating the covering layer 13 .

Such an anti-adhesion tape 60 can be used as follows, for example. That is, the release film 61 is peeled off from the adhesion release tape 60 . Next, the exposed adhesive layer 62 is arranged on the surface of the formed metal plate 11 on which the caulking material is arranged (the surface to be the top surface 21A of the protruding line portion 21 of the adapter 20 ). Then, by peeling off the 2nd release film further, the coating layer 13 can be formed in the surface of a convex line part.

[Example]

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 material

(Film 1~Film 7)

Table 1 shows the vinyl acetate content of ethylene. Granules of vinyl acetate copolymer are set between the presses, in ethylene. The melting temperature of vinyl acetate copolymer + 30 ℃ for heating and pressure molding, and obtained containing ethylene. Films 1 to 7 having a thickness of 50 μm of a vinyl acetate copolymer.

Table 1 shows the compositions of Films 1 to 7.

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

(Film 8~Film 13)

Film 8: polystyrene film (PS) (manufactured by Asahi Kasei Chemical Co., Ltd., OPS (registered trademark) film, thickness 50 μm)

Film 9: High-density polyethylene film (HDPE) (manufactured by Nitto L Materials, Polyethylene Masker, thickness 10 μm)

Film 10: polyvinylidene chloride film (PVdC) (manufactured by Asahi Kasei Co., Ltd., Salan (registered trademark) UB, thickness 25 μm)

Film 11: Polypropylene film (PP) (manufactured by Toray Film Processing Co., Ltd., Torayfan (registered trademark) NO, thickness 50 μm)

Film 12: polymethyl methacrylate film (PMMA) (manufactured by Mitsubishi Chemical Corporation, Acryplen™, thickness 50 μm)

Film 13: polycarbonate film (PC) (manufactured by Teijin Corporation, Pureace (registered trademark), thickness 100 μm)

(Paint 1~Paint 3)

Coating 1: Silicone-based coating (manufactured by Shin-Etsu Chemical Co., Ltd., silicone rubber S Coat 57)

Paint 2: Silicone-based paint (manufactured by Shin-Etsu Chemical Co., Ltd., silicone resin KR-300)

Paint 3: Epoxy resin paint (manufactured by Nippon Paint Industrial Coatings Co., Ltd., Nippon Paint Power Bind)

1-2. Manufacture and evaluation of coated metal sheet

(Preparation for chemical treatment of metal sheets)

As a coating original plate (metal plate), a 0.35 μm-thick steel plate coated with a molten 55%Al-45%Zn alloy (both sides: 150 g/m ² ) was prepared.

Alkaline degreasing was performed on this plated steel sheet. Then, on the surface of the obtained plated steel sheet, as a pre-coating treatment, a coating type chromate treatment solution (Surfcoat (Surfcoat) NRC300, manufactured by Nippon Paint Co., Ltd.) was applied, and it was carried out at a temperature of 100°C. Heated to form a chemical conversion treatment film with a total chromium conversion adhesion amount of 40 mg/m ² to obtain a chemical conversion treatment metal plate.

(Preparation of clad metal plate 1~clad metal plate 4 and clad metal plate 8~clad metal plate 10)

The film shown in Table 2 is arranged on the chemical conversion treatment film of the obtained chemical conversion treatment metal plate, and the ethylene. After the vinyl acetate copolymer was bonded temporarily at the glass transition temperature (Tg) + 40°C, it was further heated in an oven at the glass transition temperature (Tg) + 80°C for 60 seconds to form a coating layer with a thickness of 50 μm, thereby obtaining The clad metal plate 1 - the clad metal plate 4 and the clad metal plate 8 - the clad metal plate 10 .

(Manufacturing of the clad metal plate 5)

After coating the coating material shown in Table 2 on the chemical conversion-treated film of the obtained chemical conversion-treated metal plate, it was dried at room temperature for 1 week to form a coating layer with a thickness of 100 μm, thereby obtaining a coated metal plate 5 .

(Manufacturing of the clad metal plate 11)

The coating materials shown in Table 2 were coated on the chemical conversion-treated film of the obtained chemical conversion-treated metal plate, and then heated at 300° C. to form a coating layer with a thickness of 5 μm, whereby the coated metal plate 11 was obtained.

(Fabrication of the clad metal plate 6, the clad metal plate 12, and the clad metal plate 14)

Will vinyl. Except having changed the vinyl acetate copolymer film 1 into the film shown in Table 2, it carried out similarly to the clad metal plate 1, and the clad metal plate 6, the clad metal plate 12, and the clad metal plate 14 were obtained. In addition, thermal lamination (temporary bonding) was performed at the glass transition temperature (Tg)+40 degreeC of resin, and the heating with an oven was performed at glass transition temperature (Tg)+80 degreeC of resin.

(Fabrication of the clad metal plate 7, the clad metal plate 13, and the clad metal plate 15)

The coated metal plate 7 , the coated metal plate 13 , or the coated metal plate 15 is obtained by adhering the film 9 , the film 11 , or the film 13 via an adhesive on the chemical conversion-treated film of the obtained chemical conversion-treated metal plate.

(Manufacturing of the clad metal plate 16)

The coating materials shown in Table 2 were coated on the chemical conversion-treated film of the obtained chemical conversion-treated metal plate, and then heated at 200° C. to form a coating layer with a thickness of 5 μm, whereby the coated metal plate 16 was obtained.

The volume resistivity and surface free energy of the coating layers in 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 materials - volume resistivity and surface resistivity measurement method". The measurement was performed under the following conditions.

(Test conditions)

Test device: digital ultra-high resistance/micro ammeter 8340A type (manufactured by ADC Corporation)

Electrode size: main electrode 50mmΦ, protective electrode inner diameter 60mmΦ, outer diameter 80mmΦ

Applied voltage: 100V, 500V (DC)

Application time: 60sec

Test environment: temperature 23℃±2℃, humidity 50%RH±5%RH

Test piece size: 100mm×100mm

Number of trials: n=3

(surface free energy)

The contact angles of pure water and diiodomethane were measured in accordance with JIS R 3257: 1999 "Testing method for wettability of the surface of substrate glass". The 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 value of the contact angle and the Kaelble-Uy formula.

Furthermore, non-adhesion to the caulking material of the exposed covered metal sheets 1 to 16 was measured by the following method.

(relative to non-adhesion of gap filler)

According to JIS Z 2381, the obtained coated metal plate was exposed at an exposure angle of 35 degrees and an installation direction facing south for two weeks outdoors. The primer for the gap filler was applied to the covered metal plate after outdoor exposure with a brush, and dried at room temperature for 30 minutes. Next, apply a gap filler on the surface of the primer and dry it at room temperature 1 week.

The dried caulking material was peeled off from the coated metal plate by hand, and those that were easily peeled off were all evaluated as "◯" and those that were (mostly) not peeled off were evaluated as "×".

Furthermore, the gap filler is a one-component modified silicone-based gap filler (SR seal S70; Sunrise MSI Co., Ltd.), or a urethane-based gap filler (FC700; (Nichiha) Co., Ltd.). In addition, the primer is applied under conditions close to the actual construction conditions in consideration of the fact that the primer is often accidentally applied to the surface of the receiving portion of the caulk during actual construction.

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

As shown in Table 2, it can be seen that the volume resistivity is 1.0×10 ¹⁷ Ω. Coated metal sheet 1 to coated metal sheet 5 having a coating layer having a surface free energy of 36.6 mJ/m ^{2 or less and having a surface free energy of 36.6 mJ/m 2 or} less compared to any of the urethane-based gap filler and the silicone-based gap filler , and the non-adhesion properties after exposure were all good.

On the other hand, it can be seen that the coated metal sheets 6 to 16 having a coating layer in which at least one of the volume resistivity and the surface free energy fall outside the scope of the present application are relatively weaker than the urethane-based gap filler and silicone All of the gap fillers had low non-adhesion after exposure.

2-1. Preparation of coating material

(Film 14~Film 18)

Using a mixer will contain 100 parts by mass of ethylene. Vinyl acetate copolymer (vinyl acetate content rate: 8% by mass) was kneaded with granules containing stearic acid amide in the amount shown in Table 3 as a slip agent, placed between press machines, and Vinyl. The melting temperature of the vinyl acetate copolymer +30° C. was heated and press-molded to obtain films 14 to 18 with a thickness of 50 μm.

2-2. Manufacture and evaluation of coated metal sheet

(Fabrication of the coated metal plate 17 to the coated metal plate 21)

Will vinyl. Except having changed the vinyl acetate copolymer film 2 into the film shown in Table 4, it carried out similarly to the clad metal plate 2, and the clad metal plate 17 - the clad metal plate 21 were obtained.

(volume resistivity, surface free energy)

The volume resistivity and surface free energy of the coating layers of the obtained coated metal sheets 17 to 21 were measured by the same method as described above.

(relative to non-adhesion of gap filler)

In addition to changing the outdoor exposure time to 1 month for the non-adhesion of the obtained coated metal sheets 17 to 21 to the caulking material Measured by the same method as described above.

Then, the dried caulking material was peeled off from the coated metal plate by hand, and those who were easily peeled off completely were rated as "◎", and those that were largely peeled off and had no practical problems although there were some parts that were difficult to peel off were rated as "○" ".

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

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

This application claims priority based on Japanese Patent Application No. 2018-065011 filed on March 29, 2018 and Japanese Patent Application No. 2019-020827 filed on February 7, 2019. All the content described in this application specification and drawing is incorporated in this application specification.

[Industrial availability]

According to the present invention, it is possible to provide a coated metal plate that maintains non-adhesion to a caulk even after being placed outdoors. This kind of coated metal plate can maintain good non-adhesion to the gap filler, and is suitable as a joint that can suppress three-sided adhesion. synthesizer.

10‧‧‧clad metal plate

11‧‧‧Metal plate

13‧‧‧coating layer

Claims (12)

A covered metal plate, which has: a metal plate; and a coating layer, configured on the surface of the metal plate and containing ethylene. Vinyl acetate copolymer, the volume resistivity of the coating layer measured according to Japanese Industrial Standard C 2139:2008 is 1.0×10 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 Japanese Industrial Standard R 3257:1999 is 36.6 mJ/m ² or less. As described in Item 1 of the scope of application for the covered metal sheet, wherein relative to the composition of the vinyl. All structural units of vinyl acetate copolymer, the ethylene. The content rate of the vinyl acetate-derived structural unit of a vinyl acetate copolymer is 5 mass % or more and less than 20 mass %. The coated metal plate as described in item 1 of the patent claims, wherein the coating layer further includes a slip agent. The coated metal plate as described in item 1 of the patent application, wherein the thickness of the coating layer is 3 μm to 120 μm. The coated metal sheet according to claim 1, wherein the metal sheet has a chemical conversion treatment film arranged on the surface where the coating layer is arranged. An adapter, which is used to be arranged at the seam of adjacent outer packaging materials and has a coated metal plate as described in item 1 of the scope of the patent application. The adapter described in item 6 of the scope of the patent application, wherein the adapter It has a convex line part and a base part connected to the base end part of the said convex line part, and the said coating layer is arrange|positioned at least on the surface for supporting a gap filler in the said convex line part. An adapter having a coated metal plate arranged at a seam portion of adjacent outer packaging materials, the covered metal plate having: a metal plate; and a coating layer arranged on a surface of the metal plate and containing a resin, The volume resistivity of the coating layer measured according to Japanese Industrial Standard C 2139:2008 is 1.0×10 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 Japanese Industrial Standard R 3257:1999 is 36.6 mJ/m ² or less. The adapter according to claim 8 of the patent application, wherein the adapter has a protruding part and a base part connected to the base end of the protruding part, and at least one of the protruding parts is used for The surface supporting the gap filler is provided with the covering layer. An anti-adhesive tape, which has a release film, an adhesive layer, and a coating layer in sequence, the coating layer includes a resin, and the volume resistivity of the coating layer measured according to Japanese Industrial Standard C 2139:2008 is 1.0× 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 Japanese Industrial Standard R 3257:1999 is 36.6 mJ/m ² or less. Anti-adhesive tape as described in item 10 of the patent application, wherein the resin is ethylene. Vinyl acetate copolymer. The anti-adhesive tape as described in item 10 of the patent application, wherein the resin is silicone rubber.