How to repair exterior decorative materials

Abstract

To provide a repair method of an exterior decorative material which can achieve preferable adhesion of an exterior repair sheet which is newly adhered, and which has less deterioration.SOLUTION: There is provided a repair method of an exterior decorative material using, an exterior repair sheet which includes: a decorative sheet: and an adhesive layer, for repairing the exterior decorative material on which an adhered decorative sheet on which a pattern is formed, is laminated on an adhesion structure material. The decorative sheet comprises in the order, a surface protection layer, a pattern layer, and a substrate layer. The adhesive layer is laminated on the substrate on an opposite surface side of a surface on which the pattern layer is laminated. The method comprises: a removing step for removing a part of the adhered decorative sheet from the exterior decorative material; a primer layer laminating step for laminating a primer material to an exposed surface of the exterior decorative material exposed by the removing step, for forming the primer layer; and a sticking step for, on the surface on which the primer layer is laminated on the exterior decorative material, pressing an adhesive layer of the exterior repair sheet, for sticking the exterior repair sheet to the exterior decorative material.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a method for repairing exterior decorative materials. [Background technology]

[0002] Exterior decorative materials are durable consumer goods that generally require a certain level of durability, scratch resistance, and weather resistance. However, there is a risk that the design and function may deteriorate due to prolonged use, use in unexpected environments, or other external factors. Patent Documents 1 and 2 propose decorative repair sheets. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-127291 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-094566 Summary of the Invention [Problem to be solved by the invention]

[0004] The remodeling methods disclosed in Patent Documents 1 and 2 are for a situation where a decorative material suitable for remodeling as disclosed in Patent Documents 1 and 2, i.e., a decorative material having a release layer consisting of two release agent layers that can be separated from each other by delamination, has already been applied. Therefore, if a general decorative material other than the decorative material disclosed in Patent Documents 1 and 2 has been applied, the remodeling methods cannot be applied.

[0005] In exterior decorative materials that have been used outdoors for a long period of time and require repair, the sheet portion related to the decorative function of the exterior decorative material (the substrate decorative sheet portion described below) is thought to have deteriorated considerably. Therefore, it is preferable to remove all of the deteriorated substrate decorative sheet portion before applying a new decorative sheet, but removing all of the substrate decorative sheet portion is a heavy workload, which tends to lengthen the construction period and increase costs. For this reason, it is common to leave some or all of the deteriorated decorative sheet in place and then apply a new decorative sheet over it. In such cases, if the base is not treated appropriately, the new decorative sheet may not be able to demonstrate its inherent adhesive strength, and problems such as lifting, peeling, or discoloration of the pattern may occur over time.

[0006] In view of the above, an object of the present disclosure is to provide a method for repairing exterior decorative materials that ensures good adhesion of a newly applied exterior material repair sheet and minimizes deterioration. [Means for solving the problem]

[0007] The method for repairing exterior decorative materials disclosed herein is a method for repairing exterior decorative materials in which an adherend decorative sheet having a pattern formed thereon is laminated onto an adherend structural material, using an exterior material repair sheet having a decorative sheet and an adhesive layer, in which the decorative sheet has a surface protection layer, a pattern layer, and a base material layer laminated in this order, and the adhesive layer is laminated on the side of the base material layer opposite to the side on which the pattern layer is laminated, and the method comprises, in this order, a removal step for removing a portion of the adherend decorative sheet from the exterior decorative material, a primer layer lamination step for laminating a primer material onto the exposed surface of the exterior decorative material exposed by the removal step to form a primer layer, and an attachment step for attaching the exterior material repair sheet to the exterior decorative material by pressing the adhesive layer of the exterior material repair sheet against the surface of the exterior decorative material on which the primer layer is laminated, and in which the arithmetic mean height Sa of the primer layer surface after the primer layer lamination step and before the attachment step is 5 μm or less.

[0008] In the removing step of the above-mentioned method for repairing an exterior decorative material, the grit size of the sandpaper used last may be #100 or more and #400 or less.

[0009] The amount of primer material applied in the primer layer lamination step of the above-mentioned exterior decorative material repair method is 10 g / m 2 It may be the following:

[0010] In the above-mentioned method for repairing an exterior decorative material, the adherend decorative sheet may have an adherend substrate layer, an adherend picture pattern layer, and an adherend surface protective layer, and the adherend surface protective layer may disappear in the removal step.

[0011] In the above-mentioned method for repairing an exterior decorative material, the adhesive strength measured under the following conditions after being left for 24 hours after the application step may be 10 N / 25 mm or more. Measurement conditions: A 25mm wide, 100mm long section of the exterior repair sheet was measured in a 180° direction at a speed of 300mm / min using a tensile testing machine in accordance with the method specified in JIS Z 0237:2009.

[0012] The primer layer laminating step in the above-mentioned method for repairing an exterior decorative material may involve applying the primer material with a brush in one or two steps. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to provide a method for repairing exterior decorative materials that ensures good adhesion of newly applied exterior material repair sheets and minimizes deterioration. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing an outline of the layer structure of an exterior material repair sheet according to an embodiment of the present disclosure. [Figure 2] 1 is a cross-sectional view showing an outline of the layer structure of an exterior decorative material and a decorative sheet to be attached according to an embodiment of the present disclosure. [Figure 3] 1 is a cross-sectional view illustrating a removal step in a repair method for an exterior decorative material according to an embodiment of the present disclosure. [Figure 4] 1 is a cross-sectional view illustrating a primer layer lamination step in a repair method for an exterior decorative material according to an embodiment of the present disclosure. [Figure 5] 1 is a cross-sectional view illustrating a bonding step in a repair method for an exterior decorative material according to an embodiment of the present disclosure. [Figure 6] 1 is a cross-sectional view illustrating a bonding step in a repair method for an exterior decorative material according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, the method for repairing an exterior decorative material will be described in detail with reference to the drawings. In the following description, specific numerical values, shapes, materials, etc. are given, but these can be changed as appropriate. In this specification, terms such as plate, sheet, and film are used, but in general usage, these are used in order of thickness: plate, sheet, and film, and this specification follows suit. Plates, sheets, and films may be used to form layers. However, such distinctions have no technical meaning, and the essence of this disclosure and interpretation of the claims will not change even if these terms are appropriately substituted. In this disclosure, the term sheet is used in a broad sense to include thickness forms commonly referred to as plates, sheets, and films.

[0016] Furthermore, the term "surface" refers to a surface that coincides with the planar direction of the target sheet-like member when the target sheet-like member is viewed holistically and from a global perspective. The normal direction used for a sheet-like member refers to the normal direction to the member's surface. As used in this specification, terms that specify the shape and geometric conditions and their degree, such as "parallel" and "orthogonal," as well as length and angle values, are not bound by strict meanings but are interpreted to include a range within which similar functions can be expected. Furthermore, although the terms "front side" and "back side" are used in this specification, the distinction between the front side and the back side has no technical meaning, and when one side of the sheet is referred to as the front side, the other side is referred to as the back side. In the decorative sheet in this specification, the side that is normally observed when using the decorative sheet is referred to as the front side, and the opposite side is referred to as the back side.

[0017] Furthermore, in this specification, when multiple upper limit candidates and multiple lower limit candidates are listed for a certain parameter, the numerical range of the parameter may be constructed by combining any one upper limit candidate with any one lower limit candidate. For example, consider a description that reads, "Parameter B is, for example, A1 or more, or may be A2 or more, or may be A3 or more. Parameter B is, for example, A4 or less, or may be A5 or less, or may be A6 or less." In this case, the numerical range of parameter B may be A1 or more and A4 or less, A1 or more and A5 or less, A1 or more and A6 or less, A2 or more and A4 or less, A2 or more and A5 or less, A2 or more and A6 or less, A3 or more and A4 or less, A3 or more and A5 or less, or A3 or more and A6 or less.

[0018] [Exterior repair sheets and exterior decorative materials] An embodiment of the present disclosure will be described below with reference to FIG. 1. Note that the figures shown below are schematic diagrams, and the size, shape, decoration, etc. of each part are appropriately exaggerated or simplified to facilitate understanding. Furthermore, configurations not directly related to the explanation are appropriately omitted. Note that in the figures below, the same parts are assigned the same reference numerals, and some detailed explanations may be omitted.

[0019] (Outline of repair methods for exterior decorative materials) The method for repairing an exterior decorative material according to the present disclosure is a method for repairing an exterior decorative material 100 in which an adherend decorative sheet 110 having a pattern formed thereon is laminated on an adherend structural material 180, using an exterior material repair sheet 1 having a decorative sheet 10 and an adhesive layer 40. The decorative sheet 10 has a surface protection layer 14, a picture pattern layer 12, and a base layer 11 laminated in this order, and the adhesive layer 40 is laminated on the side of the base layer 11 opposite to the side on which the picture pattern layer 12 is laminated, This method for repairing an exterior decorative material 100 comprises, in this order: a removal step for removing a portion of the adherend decorative sheet 110 from the wearable decorative material 100; a primer layer lamination step for laminating a primer material onto the exposed surface of the exterior decorative material 100 exposed by the removal step to form a primer layer 70; and an attachment step for attaching an exterior material repair sheet 1 to the exterior decorative material 100 by pressing the adhesive layer 40 of the exterior material repair sheet 1 against the surface of the exterior decorative material 100 onto which the primer layer 70 has been laminated. In this disclosure, the names of the elements (layers) that make up the exterior decorative material 100, which is the repair target to which the exterior material repair sheet 1 for repair is attached, include the word "adhered." Because the functions of the elements (layers) that make up the exterior material repair sheet 1 and the exterior decorative material 100 are similar, the elements (layers) of the two are distinguished by including the word "adhered" in the names of the elements (layers) of the exterior decorative material 100.

[0020] (Exterior repair sheet) First, an exterior material repair sheet 1 used in the method for repairing an exterior decorative material according to the present disclosure will be described. FIG. 1(a) shows a cross-sectional view illustrating an outline of the layer structure of exterior material repair sheet 1. Exterior material repair sheet 1 is formed by laminating, from the top in FIG. 1(a), a decorative sheet 10 and an adhesive layer 40 in this order. Decorative sheet 10 is formed by laminating, from the top in FIG. 1(a), a surface protective layer 14, a picture / pattern layer 12, and a base layer 11 in this order. That is, exterior material repair sheet 1 is formed by laminating, from the top in FIG. 1(a), a surface protective layer 14, a picture / pattern layer 12, a base layer 11, and an adhesive layer 40 in this order. As in the example of FIG. 1(a), a transparent resin layer 13 may be present between surface protective layer 14 and picture / pattern layer 12. The side of exterior material repair sheet 1 facing decorative sheet 10, in other words, the side of surface protective layer 14 of decorative sheet 10, is the observation surface.

[0021] The exterior material repair sheet 1 may include layers other than those described above. For example, as shown in Figure 1(a), a release layer 50 may be provided on the side of the adhesive layer 40 opposite the side on the base material layer 11 side. In a configuration having the release layer 50, the adhesive layer 40, which has adhesiveness, is not exposed, improving the handleability of the exterior material repair sheet 1 before application. The exterior material repair sheet 1 in a state having the release layer 50 is sometimes referred to as an exterior material repair sheet 2 with a release layer. As another example, as shown in Figure 1(b), the exterior material repair sheet 1 may have a core layer 30 between the base material layer 11 and adhesive layer 40 of the decorative sheet 10. In this case, an adhesive layer 20 is usually provided between the base material layer 11 and the core layer 30. In a form having the core layer 30, the degree to which the uneven shape of the surface to which the exterior material repair sheet 1 is attached is visually recognized as an uneven shape on the observation surface of the exterior material repair sheet 1 after application can be reduced. On the other hand, the price and weight of the exterior material repair sheet 1 increase.

[0022] Each layer of the exterior material repair sheet 1 will be described below. As described above, exterior material repair sheet 1 includes decorative sheet 10 and adhesive layer 40. Decorative sheet 10 is a highly weather-resistant decorative sheet intended for outdoor use. As described above, decorative sheet 10 includes surface protective layer 14, picture pattern layer 12, and base material layer 11, and may include transparent resin layer 13 between surface protective layer 14 and picture pattern layer 12.

[0023] <Surface protective layer> The surface protective layer 14 is located on the outermost surface of the decorative sheet 10 and the exterior material repair sheet 1 on the observation side, and is a layer that provides surface protective properties such as stain resistance, weather resistance, solvent resistance, abrasion resistance, and scratch resistance to the exterior material repair sheet 1 while ensuring the visibility of the pattern on the picture and design layer 12. The surface protective layer 14 is a layer made of a crosslinked and cured product of an ionizing radiation curable resin composition containing an ionizing radiation curable resin. The surface protective layer 14 preferably contains a weathering agent. Here, the ionizing radiation-curable resin composition is a resin composition that is cured by irradiation with ionizing radiation. The ionizing radiation may be electromagnetic waves or charged particle beams that have an energy quantum capable of polymerizing or crosslinking molecules, such as ultraviolet (UV) rays or electron beams (EB), or may be electromagnetic waves such as X-rays and gamma rays, or charged particle beams such as alpha rays and ion beams.

[0024] It is preferable to use an electron beam curable resin as the ionizing radiation curable resin. Electron beam curable resins can be made solvent-free, which is more preferable from the standpoint of the environment and health, and they do not require a photopolymerization initiator, resulting in stable curing properties. Furthermore, they require a short time for ionizing radiation irradiation during curing, which can suppress shrinkage during the manufacturing process. Furthermore, electron beam curable resins have superior surface properties for the surface protection layer 14, such as scratch resistance, weather resistance, and durability of function, compared to ultraviolet curable resins. The surface protective layer 14 is preferably colorless and transparent so that the design of the picture pattern layer 12 can be clearly seen from the observation surface (surface protective layer 14) side of the exterior material repair sheet 1. However, it is not limited to this, and may be colored, transparent, or translucent.

[0025] Examples of the ultraviolet absorber as a weatherproofing agent include benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and triazine-based ultraviolet absorbers, with triazine-based ultraviolet absorbers being preferred. The content of the ultraviolet absorber is preferably from 0.2 to 10.0 parts by mass, more preferably from 0.5 to 5.0 parts by mass, and even more preferably from 1.0 to 4.0 parts by mass, relative to 100 parts by mass of the ionizing radiation-curable resin composition. The type of ultraviolet absorber used may be one type alone or a combination of two or more types.

[0026] The thickness of the surface protective layer 14 is preferably 1 μm or more and 30 μm or less, and more preferably 1 μm or more and 10 μm or less. When the thickness of the surface protective layer 14 is within the above range, the exterior material repair sheet 1 of the present disclosure can be provided with excellent surface protective properties, and shrinkage during the manufacturing process of the decorative sheet 10 is less likely to occur.

[0027] <Transparent resin layer> The transparent resin layer 13 includes a polyester resin having transparency. Here, the term "transparent" includes not only colorless transparency but also colored transparency and translucency. The polyester resin is not particularly limited, and those commonly used in the field of decorative sheets can be used. Examples include polyethylene terephthalate (hereinafter sometimes referred to as "PET"), polybutylene terephthalate, polyethylene naphthalate, polyarylate, polycarbonate, ethylene terephthalate-isophthalate copolymer, polyarylate, etc. Among these, polyethylene terephthalate, polybutylene terephthalate, etc. are preferred, and polyethylene terephthalate is particularly preferred.

[0028] The polyester film used as the transparent resin layer 13 is prepared by forming the film by, for example, a calendar method, an inflation method, a T-die extrusion method, or the like, and then biaxially stretching the film. The thickness of the transparent resin layer 13 is approximately 30 μm or more and 400 μm or less. If the thickness is 50 μm or more, when processed into the decorative sheet 10, it is less likely to pick up the irregularities of the adherend, resulting in a beautifully finished surface. On the other hand, if the thickness is 400 μm or less, it is advantageous in terms of molding processability. From the above viewpoints, the thickness of the transparent resin layer 13 is preferably in the range of 100 μm or more and 300 μm or less. The transparent resin layer 13 can be laminated on the base material layer 11 having the picture pattern layer 12 by dry lamination using an adhesive material or by heat fusion.

[0029] To improve weather resistance, the transparent resin layer 13 also preferably contains a weather resistant agent such as an ultraviolet absorber (UVA) or a hindered amine light stabilizer (HALS). The weather resistant agent is the same as that described for the surface protective layer 14. Furthermore, the surface of the transparent resin layer 13 on the observation side may be textured, such as embossed. Compared to a design consisting solely of the picture pattern of the picture pattern layer 12, the design is improved by adding a sense of visual texture and a sense of texture that can be felt by touch. In this case, it is preferable to synchronize the picture pattern of the picture pattern layer 12 with the textured texture, as this further improves the design.

[0030] The surface protective layer 14 and the transparent resin layer 13 have been described above. As described above, both layers are similar in that they contain a weathering agent and are preferably transparent, and therefore, in some cases, the two layers are indistinguishable and recognized as a single layer, or there may be a single layer to begin with. In such cases, for convenience, the layer will be referred to as the surface protective layer 14, but the composition and the like may be the same as those described for the transparent resin layer 13. Furthermore, when there is one layer, the thickness of the surface protective layer 14 may be the thickness of the surface protective layer 14 or the thickness of the transparent resin layer 13.

[0031] <Pattern layer> The picture and pattern layer 12 provides a design to the exterior material repair sheet 1. The picture and pattern layer 12 may be a uniform colored layer that covers the entire surface, or may be a picture layer formed by printing various patterns using ink and a printer. It may also have both of these. The ink used for the picture pattern layer 12 is a mixture of a binder, a coloring agent such as a pigment or dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a hardener, and the like.

[0032] The binder is not particularly limited, and may be any of polyurethane resins, urethane acrylic resins, vinyl chloride / vinyl acetate copolymer resins, vinyl chloride / vinyl acetate / acrylic copolymer resins, chlorinated polypropylene resins, acrylic resins, polyester resins, polyamide resins, butyral resins, polystyrene resins, nitrocellulose resins, cellulose acetate resins, etc., used alone or in combination of two or more. Examples of colorants that can be used include inorganic pigments such as carbon black (ink), iron black, titanium white, antimony white, yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, and cobalt blue; organic pigments or dyes such as quinacridone red, isoindolinone yellow, and phthalocyanine blue; metal pigments consisting of scaly flakes of aluminum, brass, etc.; and pearlescent pigments consisting of scaly flakes of titanium dioxide-coated mica, basic lead carbonate, etc.

[0033] Furthermore, the pattern of the design layer 12 may be a wood grain pattern, a stone pattern imitating the surface of rock such as a marble pattern (e.g., travertine marble pattern), a fabric pattern imitating a cloth or fabric-like pattern, a tiled pattern, a brickwork pattern, or a combination of these, such as marquetry or patchwork. These patterns may be formed by multicolor printing using the usual process colors of yellow, red, blue, and black, or by multicolor printing using special colors, in which blocks of each color constituting the pattern are prepared. The thickness of the picture pattern layer 12 is about 1 μm or more and 20 μm or less.

[0034] <Base material layer> The base layer 11 is the layer that forms the base of the decorative sheet 10, and is a layer that provides the strength of the decorative sheet 10, and is the layer to be laminated in the process of laminating and forming the picture pattern layer 12, etc. The base material layer 11 may be made of, for example, paper, nonwoven fabric, a thermoplastic resin sheet, or a composite material thereof. Examples of paper include tissue paper, kraft paper, wood-free paper, linter paper, baryta paper, parchment paper, and Japanese paper, and examples of nonwoven fabric include nonwoven fabrics made of fibers such as polyester resin, acrylic resin, nylon, vinylon, and glass. The basis weight of the paper or nonwoven fabric is usually 20 to 100 g / m 2 The paper or nonwoven fabric may be impregnated with a resin, or may be colored for the purpose of improving the design.

[0035] Examples of thermoplastic resin sheets include polyester resins such as polyethylene terephthalate and polybutylene terephthalate, acrylic resins, polyolefin resins, polyvinyl chloride resins, polystyrene, ABS resins, polycarbonate resins, and polyamide resins, with polyolefin resins being preferred. The thermoplastic resin sheet may be colored for the purpose of improving the design.

[0036] The layer structure of the base material layer 11 may be a single layer or a laminate of two or more layers of the above-mentioned paper, nonwoven fabric, thermoplastic resin sheet, etc. Among these, a thermoplastic resin sheet is preferred, a polyolefin resin sheet is more preferred, and a colored or uncolored polyethylene or polypropylene sheet is particularly preferred.

[0037] Furthermore, as the base material layer 11, a base material in which two or more sheets made of the above-mentioned materials are combined or laminated by known means such as adhesive or heat fusion may also be used. When the base layer 11 is made of paper or the like, it may be permeable to ink or coating liquid. In such cases, since this permeability may cause problems in subsequent printing or coating, a known sealer layer may be formed in advance on the base layer 11. Also, solid printing may be performed as part of the picture pattern layer 12, and this may also serve as a sealer layer.

[0038] The thickness of the base layer 11 (total thickness if the base layer 11 is a laminate) is not limited, but is generally about 25 μm or more and 500 μm or less, preferably 80 μm or more and 300 μm or less, and more preferably 80 μm or more and 200 μm or less.

[0039] <Adhesive layer> The adhesive layer 40 is a layer that adheres and fixes the exterior material repair sheet 1 to the exterior decorative material 100, which is the adherend, when the exterior material repair sheet 1 is applied. Examples of adhesives that form the adhesive layer 40 include adhesives such as acrylic adhesives, rubber adhesives, and silicone adhesives, which may be used alone or in combination of two or more types, but it is preferable that the adhesive layer 40 contains an acrylic resin, as this has good adhesion to the primer layer 70, since the adhesive layer 40 is attached to the primer layer 70.

[0040] For example, the acrylic resin may be one obtained by copolymerizing at least one C2-C12 alkyl ester of acrylic acid (monomer A), such as ethyl acrylate, n-propyl acrylate, n-butyl acrylate, isobutyl acrylate, n-pentyl acrylate, 2-methylbutyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, isooctyl acrylate, n-nonyl acrylate, or isononyl acrylate, with at least one functional group-containing acrylic monomer (monomer B), such as acrylic acid, methacrylic acid, acrylamide, N-methylolacrylamide, 2-hydroxyethyl acrylate, or 2-hydroxyethyl methacrylate. The copolymerization ratio of the monomer A to the monomer B, expressed as a weight ratio of monomer A / monomer B, is preferably within the range of 99.5 / 0.1 to 70 / 30, and more preferably 99 / 1 to 75 / 25.

[0041] If necessary, adhesion strengthening treatment may be carried out using a known coupling agent such as a silane coupling agent, a titanate coupling agent, etc. In order to strengthen the adhesive strength, it is preferable to roughen the surface of the exterior decorative material 100 that comes into contact with the adhesive layer. The thickness of the adhesive layer 40 is about 0.1 μm or more and 50 μm or less, and preferably 10 μm or more and 40 μm or less.

[0042] <Release layer> As described above, the exterior material repair sheet 1 before application is preferably in the form of an exterior material repair sheet 2 with a release layer, which has a release layer 50 on the side of the adhesive layer 40 of the exterior material repair sheet 1 opposite to the side facing the base material layer 11. In the exterior material repair sheet 2 with a release layer, the adhesive layer 40, which has adhesive properties, is not exposed, improving the handleability of the exterior material repair sheet 1 before application. The release layer 50 can be any of various forms known in the art, such as release film, separator paper, or peel-off film. For example, high-quality paper, coated paper, impregnated paper, or plastic film with a release layer formed on one or both sides may be used. The release layer may be made of any material that has releasability, including, but not limited to, silicone resin, organic resin-modified silicone resin, fluororesin, aminoalkyd resin, melamine resin, acrylic resin, and polyester resin. These resins may be emulsion-type, solvent-type, or solventless. When using a release film with a release layer, for example, silicone-release-type PET (polyethylene terephthalate) film, untreated PET film, PP film, or silicone-release-type paper may be used.

[0043] The thickness of the release layer 50 is preferably, for example, 10 μm to 200 μm, and more preferably 50 μm to 150 μm. If the thickness is below the lower limit of the above layer thickness range, the layer will lose stiffness and be difficult to peel. On the other hand, if the thickness exceeds the upper limit of the above layer thickness range, the layer will be too stiff, reducing workability during application. In addition, a commercially available material may be used as the release layer 50, such as a 38 μm thick polyester film (manufactured by Mitsui Chemicals Tocello Co., Ltd., product name: SP-PET-01) with one side treated for easy release using a silicone-based release agent.

[0044] (Exterior decorative materials) Next, the exterior decorative material 100 to be repaired will be described. The exterior decorative material 100 is a decorative material to be repaired in the exterior decorative material repair method of the present disclosure. The exterior decorative material 100 has deteriorated over time to the extent that repair is necessary, and additives such as weathering agents contained in the protective layer (the adhered surface protective layer 114 described below) may bleed out, causing the surface to whiten, or the design layer (the adhered design layer 112 described below) may have faded. 2(a), the exterior decorative material 100 is configured by laminating, in this order, a substrate adhesive layer 140 and a substrate decorative sheet 110 on a substrate structural material 180. The substrate decorative sheet 110 side is the observation surface.

[0045] <Adhesive structural material> The structural covering material 180 is the part that forms the framework of the exterior decorative material 100, and is the framework of the exterior walls of a building, window frames, pillars, various doors such as entrance doors, gates, gateposts, handrails, fences, roof decks, terraces, verandas, wood decks, or balconies. These materials are typically made from various materials, such as metals such as steel or aluminum, resins, wood, plaster, and combinations of these, and these materials are processed into solid or hollow shapes suitable for the intended use.

[0046] <Decorative sheet> The decorative substrate sheet 110, like the decorative sheet 10, is a highly weather-resistant decorative sheet suitable for outdoor use. The layer structure of the decorative substrate sheet 110 is the same as that of the decorative sheet 10. Specifically, the decorative substrate sheet 110 is composed of a surface protective layer 114, a picture pattern layer 112, and a substrate layer 111, laminated in this order from top to bottom in FIG. 2(b), which is the observation side. The exterior decorative material 100 to be repaired is composed of a surface protective layer 114, a picture pattern layer 112, a substrate layer 111, a pressure-sensitive adhesive layer 140, and a structural substrate 180, laminated in this order from top to bottom in FIG. 2(c), which is the observation side. As with the decorative sheet 10, a transparent resin layer 113 may be present between the surface protective layer 114 and the picture pattern layer 112. Note that FIGS. 2(b) and 2(c) show a configuration including the transparent resin layer 113.

[0047] The applied surface protective layer 114 is the same as the above-mentioned surface protective layer 14, the applied transparent resin layer 113 is the same as the above-mentioned transparent resin layer 13, the applied picture pattern layer 112 is the same as the above-mentioned picture pattern layer 12, and the applied base material layer 111 is the same as the above-mentioned base material layer 11, so explanations of each layer will be omitted. Because the decorative sheet 110 is intended for outdoor use, the layers corresponding to the deposited transparent resin layer 113 and the deposited surface protective layer 114 typically contain weathering agents. Because both layers contain weathering agents and are similar, preferably transparent, there are cases where the two layers are indistinguishable and recognized as a single layer, or there are cases where the two layers were originally a single layer. In such cases, for convenience, the layer is referred to as the deposited surface protective layer 114, but the composition and the like may be as described for the deposited transparent resin layer 113, i.e., the transparent resin layer 13. Furthermore, when there is one layer, the thickness of the deposited surface protective layer 114 may be the thickness of the surface protective layer 14 or the thickness of the transparent resin layer 13.

[0048] <Adhesive layer> The adhesive layer 140 is an adhesive for adhering the decorative sheet 110 to the structural material 180, and its composition is the same as that of the adhesive layer 40 described above, so a description thereof will be omitted.

[0049] [Method for repairing exterior decorative materials] Next, a method for repairing an exterior decorative material according to the present disclosure will be described. As described above, the method for repairing an exterior decorative material according to the present disclosure is a method for repairing an exterior decorative material 100 in which an exterior material repair sheet 1 having a decorative sheet 10 and an adhesive layer 40 is used to repair an exterior decorative material 100 in which a substrate decorative sheet 110 with a pattern formed thereon is laminated on an adherend structural material 180. The method for repairing an exterior decorative material according to the present disclosure includes, in this order: a removal step of removing a portion of the substrate decorative sheet 110 from the exterior decorative material 100; a primer layer lamination step of laminating a primer material to the exposed surface of the exterior decorative material 100 exposed by the removal step to form a primer layer 70; and an attachment step of attaching the exterior material repair sheet 1 to the exterior decorative material 100 by pressing the adhesive layer 40 of the exterior material repair sheet 1 against the surface of the exterior decorative material 100 on which the primer layer 70 is laminated. Each of the above steps will be explained below in order.

[0050] (Removal process) <Removal method> The removal process is a process of removing a portion of the adherend decorative sheet 110 in the depth direction from the adherend decorative sheet 110 located on the surface layer on the observation side of the exterior decorative material 100. Figure 3 is a diagram explaining the removal process, with the state of the exterior decorative material 100 shown in Figure 3(a) before the removal process, in Figure 3(b) during the removal process, and in Figure 3(c) after the removal process. The removal method is not particularly limited as long as it can remove the surface of the substrate decorative sheet 110. Removal using sandpaper SP (sandpaper, abrasive paper) is preferred. Methods include manually moving sandpaper SP back and forth across the surface of the substrate decorative sheet 110 to remove the surface of the substrate decorative sheet 110, or using an electric sander (power file) with sandpaper SP attached to it to remove the surface of the substrate decorative sheet 110, or a combination of these methods (Figure 3(b)). When the area to be removed is small or there is not enough clearance to use an electric sander, it is preferable to use sandpaper SP by hand; in other cases, it is preferable to use a powered removal means such as an electric sander from the perspective of work efficiency.

[0051] The removal process can be performed multiple times, changing the grit size of the sandpaper SP. Whether performed once or multiple times, it is preferable that the grit size of the sandpaper SP used last in the removal process be between #100 and #400. If the grit size exceeds #400, the surface finish of the decorative substrate sheet 110 approaches a mirror finish, which means that the anchoring effect between the primer material applied in the subsequent primer layer lamination process and the decorative substrate sheet 110 cannot be expected, raising concerns about adhesion. On the other hand, if the grit size is below #100, the surface of the decorative substrate sheet 110 will be rough, and while the anchoring effect will not be a problem, it will be difficult to obtain the desired value for the arithmetic mean height Sa of the primer layer surface after the primer layer lamination process.

[0052] <Removal depth> Next, we will explain the depth to which the deposited decorative sheet 110 is removed. Figure 2(c) is a diagram showing the details of the layer structure of the exterior decorative material 100 in Figure 2(a) when it has an deposited transparent resin layer 113. The deposited decorative sheet 110 is removed using sandpaper SP or the like from the side of the deposited surface protective layer 114, which is the observation side. The depth of removal of the substrate decorative sheet 110 is preferably such that the majority of the substrate surface protective layer 114 and the substrate transparent resin layer 113 are removed. In other words, removal of 80% or more of the substrate surface protective layer 114 is preferable, and removal to a depth greater than that at which the substrate surface protective layer 114 disappears is even more preferable. Because the substrate decorative sheet 110 is a decorative sheet designed for outdoor use, as mentioned above, the substrate surface protective layer 114 and the substrate transparent resin layer 113 are likely to contain weathering agents as additives. Additives such as weathering agents bleed out over time, potentially penetrating the primer layer 70 laminated thereon and adversely affecting the exterior material repair sheet 1 applied thereon. Adverse effects on the exterior material repair sheet 1 include, for example, discoloration of the pattern layer 12. If the deposited surface protective layer 114 or the deposited transparent resin layer 113 remains after the removal process, there is concern about the above-mentioned adverse effects on the exterior material repair sheet 1, so ideally, the deposited surface protective layer 114 and the deposited transparent resin layer 113 are completely removed. However, complete removal increases the process load, so it is sufficient if most of the deposited surface protective layer 114 and the deposited transparent resin layer 113 are removed. Even if they are not completely removed, concerns about the above-mentioned adverse effects can be alleviated depending on the degree to which the deposited surface protective layer 114 and the deposited transparent resin layer 113 are removed. Furthermore, when most of the deposited surface protective layer 114 and the deposited transparent resin layer 113 are removed, it is preferable that 80% or more of the deposited surface protective layer 114 is removed, and it is even more preferable that they be removed to a depth greater than that at which the deposited surface protective layer 114 disappears.

[0053] Because the exterior decorative material 100 to be repaired is typically installed outdoors, the removal process is also performed manually by craftsmen at the outdoor installation location of the exterior decorative material 100. This manual outdoor work makes it difficult to determine the depth of removal in micrometer-order increments. Therefore, the removal is performed while visually checking the condition of the target surface. During removal, the target surface appears white due to diffuse reflection of external light caused by fine scratches from the sandpaper SP. When the surface protective layer 114 and the transparent resin layer 113 are removed and the patterned layer 112 is exposed, the degree of whitening changes as the target changes, indicating that removal has reached the patterned layer 112. When removal is performed to ensure as uniform removal as possible across the repair surface, if the patterned layer 112 is exposed in a portion of the surface, it can be determined that most of the surface protective layer 114 and the transparent resin layer 113 have been removed in other portions as well. At that point, it is believed that the surface protective layer 114 has already disappeared.

[0054] Once it is determined that the removal has reached the overlying picture pattern layer 112, further removal would be a waste of time, and the removal work should be terminated. Furthermore, the removal work may be terminated before the removal reaches the overlying picture pattern layer 112. This is because, once the worker becomes accustomed to the removal work, they will be able to sense the progress of the removal by feel, and will be able to sense that the removal has progressed to the point where the overlying surface protective layer 114 has disappeared. In such a case, the work time involved in the removal process can be saved, and it is possible to achieve both a reduction in the adverse effects of bleed-out and a reduction in the workload of the removal process.

[0055] In view of the above, it is preferable that the removal in the removal step is performed to a depth at which the deposited surface protective layer 114 disappears or more. In other words, it is preferable that the deposited surface protective layer 114 disappears in the removal step. As described above, this is because it is possible to significantly reduce concerns about the adverse effects of bleed-out caused by the remaining deposited surface protective layer 114 or deposited transparent resin layer 113.

[0056] In the removal process of the exterior decorative material repair method of the present disclosure, it is not necessary to remove all layers of the substrate decorative sheet 110; it is sufficient to remove layers deep enough to remove the substrate surface protective layer 114. Compared to removing all layers of the substrate decorative sheet 110 or removing layers until the substrate picture pattern layer 112 is clearly visible, the removal time can be reduced, thereby shortening the construction time required to repair the exterior decorative material 100 and ultimately reducing repair costs. Another advantage is that the amount of waste generated during removal can be reduced, making it environmentally friendly. Meanwhile, in terms of reducing the adverse effects of bleed-out, an effect similar to that achieved when all layers of the substrate decorative sheet 110 were removed can be achieved.

[0057] (Primer layer lamination process) <Primer layer> Next, the primer layer lamination process will be described. The primer layer lamination process is a process in which a primer material is laminated onto the deposited transparent resin layer 113 or the deposited picture pattern layer 112 of the deposited decorative sheet 110 that was exposed in the removal process, thereby forming a primer layer 70. Figure 4 is a diagram illustrating the primer layer lamination process, and the state of the exterior decorative material 100 involved in repair is shown in Figure 4(a) before the primer layer lamination process, in Figure 4(b) during the primer layer lamination process, and in Figure 4(c) after the primer layer lamination process. By forming the primer layer 70, the adhesion between the exterior decorative material 100 and the adhesive layer 40 of the exterior material repair sheet 1 can be improved when the exterior decorative material 100 is laminated (attached) to the exterior decorative material 100 in the next lamination process. As described above, the primer material, i.e., the material of the primer layer 70, is not particularly limited as long as it improves adhesion to the adhesive layer 40, but examples include urethane resin, acrylic resin, cellulose resin, polyester resin, vinyl chloride-vinyl acetate copolymer, etc.

[0058] <Application method and amount> The method for laminating the primer material in the primer layer lamination step is not particularly limited, but it is common to apply a liquid primer material 70S. As an application method, a worker at the construction site can manually apply the liquid primer material 70S using, for example, a brush Br or a bar coater (coating bar) (FIG. 4(b)). The application amount of primer material 70S is 10g / m 2 Furthermore, it is preferable that the arithmetic mean height Sa of the surface of the primer layer 70 after the primer layer laminating step and before the pasting step is 5 μm or less, and the application amount of the primer material 70S is 10 g / m or less. 2 This is because if the thickness is less than or equal to 5 μm, it is easy to make the arithmetic mean height Sa of the primer layer surface 5 μm or less. When using a brush Br to apply the liquid primer material 70S, it is preferable to apply the primer material 70S in one or two passes. If application and subsequent drying are considered to be one cycle, then applying in one pass means that the above application and subsequent drying are performed in only one cycle. Therefore, applying in one or two passes means that the above cycle is performed in one or two cycles. As described above, the application amount of the primer material 70S is 10 g / m 2 However, when applying the primer material 70S in one or two coats using a brush Br, the coating amount is 10 g / m or less. 2 It is easy to do as follows:

[0059] <Arithmetic mean height Sa of primer layer> As described above, it is preferable that the arithmetic mean height Sa of the surface of the primer layer 70 after the primer layer lamination step and before the pasting step is 5 μm or less. This is because the adhesive strength between the adhesive layer 40 of the exterior material repair sheet 1 pasted in the pasting step and the primer layer 70 can be increased, so that high adhesiveness can be maintained after application. As described above, in the removal step, the grit size of the sandpaper SP used last is set to between #100 and #400, and as described above, in the primer layer lamination step, the primer material 70S is applied in one or two passes using a brush Br so that the application amount is 10 g / m 2 By combining the above, the arithmetic mean height Sa of the surface of the primer layer 70 after the primer layer laminating step and before the bonding step can be set to 5 μm or less.

[0060] Here, the measurement of the arithmetic mean height Sa will be explained. The arithmetic mean height Sa is measured in accordance with ISO25178-6:2010. Specifically, a non-contact shape analysis laser microscope (Keyence: VK-X1000) is used to measure the arithmetic mean height Sa at 10 points within the surface of the decorative sheet under the following conditions. The average values ​​of each measurement were taken as Sz and Sa for the decorative sheets of the examples and comparative examples. The results are shown in Table 1. [Surface roughness measuring instrument measurement conditions] S-filter: None L-filter: None ·Magnification: 400x Measurement range: 400μm x 500μm

[0061] (Pasting process) <How to paste> Next, the attachment step will be described. The attachment step is a step of attaching the exterior material repair sheet 1 to the exterior decorative material 100 by pressing the adhesive layer 40 of the exterior material repair sheet 1 against the surface of the primer layer 70 laminated in the primer layer lamination step. Figures 5 and 6 are diagrams explaining the attachment step, and the state of the exterior decorative material 100 involved in the repair is shown in Figure 5(c) before the attachment step, Figure 6(a) during the attachment step, and Figure 6(b) after the attachment step. Completing this attachment step completes the repair of the exterior decorative material 100 according to the exterior decorative material repair method of the present disclosure.

[0062] To perform the pasting step, first prepare the exterior material repair sheet 1 to be used for the repair. Before application, the exterior material repair sheet 1 is often in the form of an exterior material repair sheet 2 with a release layer, in which a release layer 50 is laminated on the surface of the adhesive layer 40 opposite to the surface facing the base material layer 11 (FIG. 5(a)). This is because the adhesive surface of the adhesive layer 40 is concealed by the release layer 50, thereby improving the handling properties of the exterior material repair sheet 1 before application. When the exterior material repair sheet 2 has the form of a peel-off layer (Figure 5(a)), the peel-off layer 50 is peeled off and removed to obtain the exterior material repair sheet 1 having the adhesive surface of the adhesive layer 40 exposed (Figure 5(b)).

[0063] Next, the adhesive layer 40 of the exterior material repair sheet 1 is placed opposite the surface of the primer layer 70 laminated in the primer layer lamination step on the exterior decorative material 100 involved in the repair (FIG. 5(c)), and the exterior material repair sheet 1 is pressed against the exterior decorative material 100 with a spatula or the like (FIG. 6(a)), and the exterior material repair sheet 1 is attached to the exterior decorative material 100 while allowing air to escape (FIG. 6(b)). This attachment step completes the repair of the exterior decorative material 100.

[0064] The tool used to press the exterior material repair sheet 1 against the exterior decorative material 100 may be a spatula, squeegee, smoothing brush, roller, or the like, or it may be pressed by hand without using a tool. A groove-shaped air release pattern may also be formed on the surface of the adhesive layer 40 opposite to the surface on the base material layer 11 side. In this case, it is possible to further prevent air from being trapped between the adhesive layer 40 of the exterior material repair sheet 1 and the exterior decorative material 100 during the attachment process.

[0065] In the above explanation, the exterior material repair sheet 1 has been described as having an adhesive layer 40. However, this is not a limitation, and the exterior material repair sheet 1 does not have to have an adhesive layer 40. In that case, in the attachment step, an adhesive similar to the adhesive associated with the adhesive layer 40 may be sandwiched between the base material layer 11 of the exterior material repair sheet 1 and the primer layer 70. As an example, an adhesive similar to the adhesive associated with the adhesive layer 40 may be applied to the base material layer 11 of the exterior material repair sheet 1, and then the attachment step may be performed. Alternatively, an adhesive similar to the adhesive associated with the adhesive layer 40 may be applied to the primer layer 70, and then the attachment step may be performed.

[0066] <Adhesive strength> In the repair method for exterior decorative materials disclosed herein, it is preferable that 24 hours or more elapse after completion of application until the adhesion of the exterior material repair sheet 1 to the exterior decorative material 100 stabilizes at a predetermined adhesion strength. After the application step, that is, after being left for 24 hours after completion of application, the adhesive strength under the following measurement conditions is preferably 10 N / 25 mm or more. Measurement conditions: A 25mm wide, 100mm long section of the exterior repair sheet was measured in a 180° direction at a speed of 300mm / min using a tensile testing machine in accordance with the method specified in JIS Z 0237:2009.

[0067] In the repair method for exterior decorative materials of the present disclosure, in the removal step, the adhered surface protective layer 114 and the adhered transparent resin layer 113 are completely removed, and removal is performed to a depth where the adhered picture pattern layer 112 or the adhered base material layer 111 is partially removed. The grit size of the sandpaper SP used at the end is #100 or more and #400 or less. In the primer layer lamination step, the amount of primer material 70S applied is 10 g / m. 2By ensuring that the arithmetic mean height Sa of the primer layer surface is 5 μm or less, a high adhesive strength of 10 N / 25 mm or more can be achieved after being left for 24 hours after application is completed. As will be described later, this adhesive strength maintains high adhesion over time, making this a highly reliable method for repairing exterior decorative materials. Furthermore, the repair method for exterior decorative materials disclosed herein minimizes disadvantages such as the adverse effects of bleed-out caused by leaving part of the attached decorative sheet 110, resulting in minimal deterioration after application. [Example]

[0068] [Example] Example 1 Examples and comparative examples according to the present disclosure will be described below. In Example 1, an exterior olefin decorative sheet (EB exterior file (persimmon tannin pattern) manufactured by Dai Nippon Printing Co., Ltd.) (corresponding to the decorative sheet 110) having an outermost layer of 80 μm thick polypropylene (corresponding to the surface protective layer 114) was adhered to the surface of an aluminum alloy plate A5052P (corresponding to the structural material 180) using a hot melt adhesive (Aronmelt (registered trademark) manufactured by Toagosei Co., Ltd.) (corresponding to the adhesive layer 140), and the repair target was (corresponding to the exterior decorative material 100). The exterior olefin decorative sheet was sanded with #240 sandpaper (finishing paper manufactured by Kovacs Co., Ltd.) until the pattern layer (corresponding to the attached pattern layer 112) of the exterior olefin decorative sheet was partially exposed (corresponding to the removal process), and a primer material (3M Di-Noc (registered trademark) film auxiliary primer DP-900N3) was applied to the surface layer in a single coat using a brush (corresponding to the primer layer lamination process). Separately, an acrylic two-component curing adhesive (manufactured by Nichiei Shinka Co., Ltd.) was applied to the surface of the base layer (corresponding to base layer 11) of the same exterior olefin decorative sheet (corresponding to decorative sheet 10) as above (corresponding to adhesive layer 40) to prepare an adhesive decorative sheet (corresponding to exterior material repair sheet 1). The surface of the exterior olefin decorative sheet coated with an acrylic two-component curing adhesive was pressed against the primer material applied to the repair object, and a 2 kg roller was moved back and forth twice to adhere it (corresponding to the adhering process), resulting in a sample of Example 1.

[0069] Example 2-1 In Example 2-1, the primer material was applied in a single coat using a brush instead of a single coat using a #5 bar coater (wire bar), and all other procedures were the same as in Example 1, to prepare a sample according to Example 2-1. The #5 bar coater (wire bar) refers to a bar coater (wire bar) with a wire wound around the bar having a diameter of 125 μm. In Example 2-1, as in Example 1, #240 sandpaper (finishing paper manufactured by Kovacs Co., Ltd.) was used for sanding.

[0070] (Example 2-2) In Example 2-2, the grit size of the sandpaper (finishing paper manufactured by Kovacs Co., Ltd.) used for sanding in Example 2-1 was changed from #240 to #360, and all other conditions were the same as in Example 2-1, to prepare a sample according to Example 2-2.

[0071] Example 3 As Example 3, the sanding depth in Example 2-1 was changed from being until the pattern layer of the exterior olefin decorative sheet was partially exposed to being until the base material layer of the exterior olefin decorative sheet was partially exposed, and everything else was the same as Example 2-1, to create a sample related to Example 3.

[0072] Comparative Example (Comparative Example 1) As Comparative Example 1, a sample according to Comparative Example 1 was prepared in the same manner as Example 1, except that the number of times the primer material was applied using a brush in Example 1 was changed from one time to three times. Note that one cycle of application and subsequent drying is counted as one application. Therefore, three applications means that one cycle of application and subsequent drying is repeated three times.

[0073] (Comparative Example 2) As Comparative Example 2, the grit size of the sandpaper (finishing paper manufactured by Kovacs Co., Ltd.) used for sanding in Example 2-1 was changed from #240 to #80, and all other conditions were the same as in Example 2-1, to prepare a sample according to Comparative Example 2.

[0074] (Comparative Example 3) As Comparative Example 3, the sanding depth in Example 2-1 was changed so that only a portion of the surface protective layer of the exterior olefin decorative sheet was removed until the pattern layer of the exterior olefin decorative sheet was partially exposed, and everything else was the same as in Example 2-1, resulting in a sample related to Example 3.

[0075] 〔evaluation〕 For each sample in the Examples and Comparative Examples, the adhesive strength (N / 25 mm) was measured for a 25 mm wide, 100 mm long section in a 180° direction at a speed of 300 mm / min using a tensile tester (manufactured by A&D Co., Ltd., product name "RTC-1250A") in accordance with the method specified in JIS Z 0237: 2009. For each sample, measurements were taken three times: immediately after the application process, 24 hours after the application process, and one week after the application process.

[0076] [Evaluation results] (Evaluation results of Example 1 and Comparative Example 1) The evaluation results of Example 1 and Comparative Example 1 are shown in Table 1. [Table 1] Comparing the adhesive strength of Example 1 and Comparative Example 1, Example 1 exceeded 25 N / 25 mm, which is considered to be sufficient adhesive strength, 24 hours and one week after application, whereas Comparative Example 1 only exceeded 25 N / 25 mm one week after application. Since it is preferable that the adhesive strength is sufficient after 24 hours has passed since application, Example 1 is a preferable example and Comparative Example 1 is an unpreferable example. Comparing the data for both samples in Table 1, the application amount of primer material was 10 g / m 2 It was confirmed that the thickness of the primer layer is preferably 1 μm or less, and that the arithmetic mean height Sa of the primer layer surface is preferably 5 μm or less. It was also confirmed that these preferred application amounts of primer material and arithmetic mean height Sa can be achieved by applying the primer material in one pass using a brush.

[0077] (Evaluation Results of Example 2-1, Example 2-2, and Comparative Example 2) The evaluation results of Example 2-1, Example 2-2, and Comparative Example 2 are shown in Table 2. [Table 2] Comparing the adhesive strengths, Examples 2-1 and 2-2 exceeded 25 N / 25 mm, which is considered sufficient adhesive strength, 24 hours and one week after application, whereas Comparative Example 2 did not exceed this at any time. Examples 2-1 and 2-2 are preferable examples, while Comparative Example 2 is an inappropriate example. Comparing the data for each sample in Table 2, it was confirmed that the grit of the sandpaper used at the end of the removal process is preferably #100 or higher, and that the arithmetic mean height Sa of the primer layer surface is preferably 5 μm or less.

[0078] (Evaluation results of Example 3 and Comparative Example 3) The evaluation results of Example 3 and Comparative Example 3 are shown in Table 3. [Table 3] Comparing the adhesive strength of Example 3 and Comparative Example 3, Example 3 exceeded 25 N / 25 mm, which is considered sufficient adhesive strength, 24 hours after application and one week after application, whereas Comparative Example 3 only exceeded 25 N / 25 mm one week after application. For this reason, Example 3 is a preferable example, and Comparative Example 3 is an unpreferable example. From the above, it was confirmed that, with regard to the sanding depth, a degree to which the surface protection layer remains in part is inappropriate, and an example in which the base material layer is partially exposed is one of the preferable forms.

[0079] Although the repair method for exterior decorative materials according to the present disclosure has been described above, the present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and any method that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits similar effects is included within the technical scope of the present disclosure in any case. [Explanation of symbols]

[0080] 1. Exterior material repair sheet 2. Exterior repair sheet with peeling layer 10 Decorative Sheet 11 Base material layer 12 Pattern layer 13 Transparent resin layer 14 Surface protective layer 20 Adhesive layer 30 Core layer 40 Adhesive layer 50 peeling layer 70 primer layer 70S Primer Material 100 Exterior decorative materials 110 Decorative sheet 111 Adhering base material layer 112 Covered pattern layer 113 Adhering transparent resin layer 114 Adhering surface protective layer 140 Adhesive layer 180 Adhering structural material Br brush SP Sandpaper

Claims

1. A method for repairing an exterior decorative material, comprising: using an exterior material repair sheet having a decorative sheet and an adhesive layer; repairing an exterior decorative material in which a decorative sheet having a pattern formed thereon is laminated on an adherend structural material; The decorative sheet has a surface protection layer, a picture pattern layer, and a base layer laminated in this order, the adhesive layer is laminated on the surface of the base layer opposite to the surface on which the picture pattern layer is laminated, a removing step of removing a portion of the deposited decorative sheet from the exterior decorative material; a primer layer laminating step of laminating a primer material on the exposed surface of the exterior decorative material exposed by the removing step to form a primer layer; and a bonding step of bonding the exterior material repair sheet to the exterior decorative material by pressing the adhesive layer of the exterior material repair sheet against the surface of the exterior decorative material on which the primer layer is laminated, The method for repairing an exterior decorative material, wherein the arithmetic mean height Sa of the primer layer surface after the primer layer laminating step and before the attaching step is 5 μm or less.

2. 2. The method for repairing an exterior decorative material according to claim 1, wherein the grit size of the sandpaper used last in the removing step is equal to or greater than #100 and equal to or less than #400.

3. The amount of the primer material applied in the primer layer lamination step is 10 g / m 2 3. A method for repairing an exterior decorative material according to claim 1, wherein the method comprises the following steps:

4. The decorative sheet has a substrate layer, a pattern layer, and a surface protective layer, The method for repairing an exterior decorative material according to claim 1 , wherein the adhered surface protective layer disappears in the removing step.

5. The method for repairing an exterior decorative material according to any one of claims 1 to 4, wherein the adhesive strength measured under the following conditions after being left for 24 hours after the adhering step is 10 N / 25 mm or more. Measurement conditions: A 25 mm wide, 100 mm long section of the exterior material repair sheet was measured in a 180° direction at a speed of 300 mm / min using a tensile tester in accordance with the method specified in JIS Z 0237:2009.

6. 6. The method for repairing an exterior decorative material according to claim 1, wherein the primer layer laminating step applies the primer material using a brush in one or two applications.

Images