JP6913211B1 - Structure surface protection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for protecting the surface of a structure, which can easily protect the surface, prevent peeling of an adhesive tape, and preferably impart aesthetics, weather resistance, and recoatability. SOLUTION: This is a method for protecting the surface of a structure using (A1) an adhesive layer, (A2) an adhesive tape having a barrier layer, and (B) a surface protective paint, and (A) on the surface of the structure. This is a method for protecting the surface of a structure, characterized in that an adhesive tape is attached and coating is performed so as to cover the end portion of the (A) adhesive tape with (B) a surface protective paint. [Selection diagram] None

Description

The present invention relates to a method for protecting the surface of a structure, and in particular, the surface of the structure can be easily protected, the adhesive tape can be prevented from peeling off, and preferably aesthetics, weather resistance, and recoatability can be imparted. It is about the protection method of.

Large structures such as viaducts, tunnels, bridges, steel towers, and tanks are often constructed by assembling factory-produced steel and concrete materials locally, but these members and the coating film applied to the surface are often constructed. Protective materials such as those deteriorate over time. At this time, it costs a lot of money to remove each member and replace all the parts with new ones produced at the factory. It is required that the structure can be maintained by maintenance and that it can be used for a long time.

Paint is a coating material that can decorate the surface of steel or concrete and provide an aesthetic appearance to structures, but when painting a base material such as steel, an undercoat layer that imparts adhesion to the base material and corrosion resistance. A topcoat layer that imparts weather resistance to the surface, an intermediate coat layer that secures the adhesion between the undercoat and the topcoat, and thickens the coating film, and suppresses wear and deterioration of the coating film, and multiple layers are required for painting. There is a drawback that takes time. Therefore, studies using anticorrosion tapes and anticorrosion sheets have been conducted as a surface protection method for structures that are easy to construct and can save processes.

Japanese Patent Application Laid-Open No. 2019-157603 (Patent Document 1) describes a metal material that constitutes a part of a steel structure and contains at least one selected from the group consisting of iron and an alloy containing iron. With respect to the surface, a repair adhesive tape provided on one surface of the topcoat base material and the topcoat base material and containing a metal having a lower potential than iron is attached to the surface to which the pressure-sensitive adhesive layer is bonded. A method for repairing a steel structure including a step of laminating and a step of applying a topcoat paint on a topcoat base material to form a paint coating film is described, thereby improving weather resistance and performing construction. It is said that it is possible to provide a method for repairing steel structures that maintains high corrosion resistance even after a long period of time.

Japanese Unexamined Patent Publication No. 2019-166815 (Patent Document 2) describes an acid barrier layer containing a polyolefin-based copolymer and having a specific flexural modulus, and an anticorrosion sheet containing an adhesive layer, whereby a concrete structure is described. It is said that it can be easily applied to objects, and the concrete structure can be protected from acids, especially sulfuric acid, with high reliability without causing the sheet to float even at the bent portion of the concrete surface and the overlapped portion of the sheet.

Japanese Unexamined Patent Publication No. 2019-064260 (Patent Document 3) describes a followable laminated sheet provided with a resin layer and a pressure-sensitive adhesive layer and having specific stress, residual stress, and visible light transmittance. As a result, it is possible to visually follow the defective parts due to cracks, cracks, etc. of the concrete structure, and the uneven non-land parts, and to easily protect or reinforce, or to easily suppress the progress of rust. Can be done.

Japanese Unexamined Patent Publication No. 2019-11805 (Patent Document 4) includes a base film and an adhesive layer provided on one surface of the base film, and has specific compressive stress and elongation at break. A rust-preventive adhesive film is described, which makes it possible to provide a rust-preventive adhesive film having excellent followability and handleability and capable of easily performing a rust-preventive treatment in a short working time.

According to Japanese Patent Application Laid-Open No. 59-01372 (Patent Document 5), an adhesive anticorrosive agent for stainless steel is adhered to the painted end portion in a method of applying a peeling paint to a stainless steel material, and the peeling paint is applied thereto. A method for preventing corrosion of a stainless steel material, which is characterized by being applied in layers, is described, and here, it is described that the end portion of a coating film or the end portion of an adhesive anticorrosive agent can be covered with an adhesive tape.

Japanese Patent Application Laid-Open No. 2018-001546 (Patent Document 6) describes a polyolefin-coated steel tube in which an epoxy resin primer layer, a polyolefin adhesive layer, and a polyolefin layer are sequentially laminated from the surface of the steel tube. Described is a polyolefin-coated steel pipe in which a polyolefin layer is formed at an angle of 45 degrees or less with the surface of the steel pipe, and only the epoxy resin primer layer is left uncoated on the outside from the end portion by 5 mm or more. It is said that it is possible to improve the corrosion resistance of the portion and prevent peeling from the coated end portion during storage in the storage place.

Japanese Patent Application Laid-Open No. 2019-019514 (Patent Document 7) describes a step of applying an adhesive resin over the entire outer periphery of a girder to be repaired, and a coating material from the outer periphery of the applied adhesive resin. A method for repairing a girder consisting of a step of coating a sheet and a step of curing the adhesive resin is described, so that welding work is not required and heavy objects are not required to be handled, so that the work can be performed safely. It is said that it is possible to provide a repair method for cutting beams that can be performed.

JP-A-2019-157603 JP-A-2019-166815 JP-A-2019-064260 Japanese Unexamined Patent Publication No. 2019-119805 Japanese Unexamined Patent Publication No. 59-01372 JP-A-2018-001546 Japanese Unexamined Patent Publication No. 2019-019514

Anticorrosive tapes and anticorrosive sheets are simple methods that can impart anticorrosive properties to the material to be protected by simply sticking them, but the edges of tapes are easily peeled off, and corrosion factors invade the base material from the peeled edges. However, there were problems such as the progress of deterioration.

As a method of preventing peeling of the end portion of the tape, Patent Document 2 describes a method of sealing the end portion of the anticorrosion sheet with a polyolefin-based hot melt adhesive. Further, although different from this, Patent Document 5 describes a method of preventing peeling of the coating film by covering the end portion of the coating film with an adhesive tape. Further, Patent Document 6 and Patent Document 7 describe a method of ensuring the adhesiveness of a sheet covering the surface of a base material by providing an adhesive layer. These are effective in making it difficult for the sheet layer to peel off from the base material, but the structure is also required to have aesthetics and weather resistance, as well as recoatability when repairing after several years. However, if the adhesive layer is left exposed, there are problems such as the tendency for contaminants to adhere and the appearance to deteriorate, the weather resistance to be inferior, and the adhesiveness to be deteriorated during recoating. Was being done.

Therefore, an object of the present invention is a structure capable of solving the above-mentioned problems of the prior art, easily protecting the surface, preventing peeling of the adhesive tape, and preferably imparting aesthetics, weather resistance, and recoatability. The purpose is to provide a protection method for the surface of objects.

As a result of diligent studies to achieve the above object, the present inventor has attached (A) an adhesive tape having an (A1) adhesive layer and (A2) a barrier layer to the surface of the structure, and the (A) adhesive tape. If the structure surface protection method is to cover the edges with (B) surface protection paint, the surface can be easily protected, and the adhesive tape can be prevented from peeling off, resulting in aesthetics and weather resistance. And, it has been found that the recoating property can be imparted, and the present invention has been completed.

That is, the structure surface protection method of the present invention is a structure surface protection method using (A1) an adhesive layer, (A2) an adhesive tape having a barrier layer, and (B) a surface protective paint. hand,
The structure is characterized in that (A) an adhesive tape is attached to the surface of the structure, and the end portion of the (A) adhesive tape is covered with (B) a surface protective paint.

In a preferred example of the structure surface protection method of the present invention, the (B) surface protection coating material contains (B1) a coating film-forming resin, (B2) a pigment, and (B3) a solvent at least, and the (B) surface protection. The pigment volume concentration (PVC) of the paint is in the range of 10 to 40%.

In another preferred example of the structure surface protection method of the present invention, the surface protection paint (B) is a reaction-curable paint.

In another preferred example of the structure surface protection method of the present invention, the surface protection paint (B) is a two-component reaction-curable paint.

In another preferred example of the structure surface protection method of the present invention, the (A1) adhesive layer contains a metal and / or a rust preventive pigment having a lower potential than iron.

In another preferred example of the structure surface protection method of the present invention, the structure surface protection method is a method for repairing an existing structure, and any one of the following patterns 1 to 3 or a combination thereof. Repair the surface of the structure.
(Pattern 1)
If there is a dented damaged part on the surface of the structure, after protecting the dented damaged part with (C) anticorrosive paint and / or (D) elastic paint, the (C) anticorrosive paint and / or (D) ) The (A) adhesive tape is attached so as to cover the surface protected by the elastic paint, and the end portion of the (A) adhesive tape is protected by the (B) surface protective paint.
(Pattern 2)
If there is rust or deterioration of the coating film on the surface of the structure, after cleaning the surface of the structure, (A) adhesive tape is attached to the surface of the structure, and the end of the (A) adhesive tape is attached to (B). ) Protect with surface protective paint (here, the surface of the structure that has been cleaned may be painted with (C) anticorrosive paint before applying (A) adhesive tape).
(Pattern 3)
If there are no scratches or rust on the surface of the structure, after cleaning the surface of the structure, (A) adhesive tape is attached to the surface of the structure, and the end of the (A) adhesive tape is (B) surface protected. Protect with paint.

In another preferred example of the structure surface protection method of the present invention, the surface roughness of the surface to which the adhesive tape (A) is attached is 80 μm or less.

In another preferred example of the structure surface protection method of the present invention, the region of the (A) adhesive tape covered with the (B) surface protective paint is separated from the end of the (A) adhesive tape by 10 mm or more. It is the area up to the position.

In another preferred example of the structure surface protection method of the present invention, the breaking elongation rate of the surface protection coating film formed from the (B) surface protection coating film is in the range of 0.5 to 50%. It is lower than the breaking elongation rate of the (A1) adhesive layer.

In another preferred example of the structure surface protection method of the present invention, the surface protection coating material (B) has a viscosity of 0.1 to 10,000 (Pa · s, 23 ° C.) at ^{a shear rate of 0.1 s-1.} The viscosity at a shear rate of 1000s- ¹ is 0.05 to 10 (Pa · s, 23 ° C.).

In another preferred example of the structure surface protection method of the present invention, the thickness of the (A1) adhesive layer is in the range of 20 to 1,000 μm, and the thickness of the (A2) barrier layer is 10 to 10. The thickness is within the range of 100 μm, and the thickness of the surface protective coating film formed by the (B) surface protective coating material is within the range of 10 to 100 μm.

According to the present invention, it is possible to provide a surface protection method for a structure that can easily protect the surface, prevent peeling of the adhesive tape, and preferably impart aesthetics, weather resistance, and recoatability. ..

The method for protecting the surface of the structure of the present invention will be described in detail below. The present invention relates to a method for protecting the surface of a structure, and uses (A) an adhesive tape and (B) a surface protective paint. In the present specification, the method for protecting the surface of the structure of the present invention may be referred to as the method for protecting the surface of the structure of the present invention.

The protection method of the present invention is applied to a structure. Examples of the structure include a building and a structure, and it is preferable that the structure is a structure constructed / constructed outdoors (outdoor structure). In the present specification, a building means a structure constructed for the purpose of living or staying by a human being, and examples thereof include a house (particularly a detached house or an apartment house), a building, a factory, and the like. , Means a structure constructed for purposes other than the purpose of living or staying in humans, such as high bridges, tunnels, bridges, steel towers, tanks, chimneys and the like. The structure also includes, but is not limited to, viaduct PC decks, water pipes, pipes, guardrails, handrails, lightweight steel frames, pedestals, stanchions, utility poles, and the like. When the protection method of the present invention is applied to the structure, various surface treatments such as anticorrosion treatment may be applied to the surface thereof, or at least a part of the surface of the structure may be an old coating film (of the present invention). A coating film that has already been formed when the protective method is applied) may be present.

In a preferred embodiment of the present invention, the structure may be a metal-based structure (particularly a steel structure) in which the main member is a metal member (steel material or the like), and specific examples thereof include a bridge and a steel tower. , Bridge piers, viaducts, tanks, plants, etc. The metal member is formed of, for example, alloy steel such as steel, stainless steel, nickel chrome steel, nickel chrome molybdenum steel, chrome steel, chrome molybdenum steel, manganese steel, and metal and non-metallic materials such as carbon steel. Examples include composite members.

The (A) adhesive tape used in the protective method of the present invention has (A1) an adhesive layer and (A2) a barrier layer. Adhesive tape makes it easy to protect the surface of the structure, especially the surface of the smooth part. In a preferred embodiment of the present invention, the (A) adhesive tape comprises (A1) an adhesive layer and (A2) a barrier layer arranged on the (A1) adhesive layer, where the adhesive tape is adhered. The layer side is attached to the surface of the structure.

The adhesive tape (A) is preferably an anticorrosive tape having anticorrosive properties, and is preferably a sacrificial anticorrosive tape based on sacrificial anticorrosion.

The adhesive layer (A1) preferably has self-healing properties. Self-healing refers to the property that even if the adhesive layer is damaged, the damaged portion can be repaired by the adhesive layer itself. In structures such as bridges and viaducts that are subject to large vibrations, the barrier layer and surface protective coating film (coating film formed by the surface protective coating film) may break, but even in such cases, If the adhesive layer has self-healing properties, it is possible to prevent the adhesive layer from breaking and continuously protect the surface of the structure. For example, it is possible to impart self-healing property to the adhesive layer by appropriately selecting the type and amount of the adhesive component contained in the adhesive layer, the thickness of the adhesive layer, and the like.

The adhesive layer (A1) usually preferably contains an adhesive component in order to ensure adhesion to the surface of the structure. As the adhesive component, a resin or rubber classified as an adhesive or an adhesive can be used. Adhesives are also a type of adhesive, but in general, adhesive components whose properties do not change before and after application are often referred to as adhesives. Further, from the viewpoint of (A1) imparting self-healing property to the adhesive layer, it is preferable to use an adhesive as an adhesive component.

Specific examples of the adhesive include epoxy resin, modified polyolefin resin and the like. Here, as the adhesive for the modified polyolefin resin, maleic anhydride-modified polyolefin resin is preferably mentioned. The maleic anhydride-modified polyolefin resin includes a polyolefin resin modified with maleic anhydride and an olefin copolymer using maleic anhydride as a comonomer.

Specific examples of the pressure-sensitive adhesive include an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, and a styrene rubber-based pressure-sensitive adhesive. The pressure-sensitive adhesive preferably contains a tack-imparting resin from the viewpoint of improving the adhesive strength. Specific examples of the tackifier resin include terpen resin, hydrogenated terpene resin, rosin resin, hydrogenated rosin resin, disproportionate rosin resin, kumaron resin, petroleum resin and the like.

In the (A1) adhesive layer, the amount of the adhesive component is, for example, 40 to 100% by mass, preferably 50 to 90% by mass. Further, from the viewpoint of imparting self-healing property to the (A1) adhesive layer, the amount of the adhesive component, preferably the pressure-sensitive adhesive, in the adhesive layer is preferably 60% by mass or more. The adhesive component may be used alone or in combination of two or more.

Further, as the (A1) adhesive layer, rubber or an elastomer that is not classified as an adhesive component may be used from the viewpoint of self-repairing property. For example, ethylene-vinyl acetate copolymer, acrylic rubber, natural rubber (NR), isoprene rubber (IR), styrene butadiene rubber (SBR), chloroprene rubber (CR), butyl rubber (IIR), ethylene propylene rubber (EPM, EPDM). ), Polyisobutylene, styrene-ethylene-butylene-styrene copolymer (SEBS), acrylonitrile-butadiene copolymer (NBR), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer Coalescence (SIS), polyvinyl alkyl ether (for example, polyvinyl isobutyl ether) and the like can be exemplified. These may be used alone or in combination of two or more. When rubber or elastomer is blended in the adhesive layer, the blending amount is preferably in the range of 0 to 40% by mass, for example, from the viewpoint of ensuring self-healing property and water vapor blocking property without reducing the adhesiveness.

(A1) The adhesive layer may contain a metal that is lower than iron. As used herein, the term "metal lower than iron" means a metal having a higher ionization tendency than iron or an alloy containing the metal. In the present specification, "a metal lower than iron" is also referred to as an anticorrosion metal. When the adhesive layer contains an anticorrosive metal, the surface of the structure is imparted with anticorrosive properties by adhering the surface of the adhesive tape on the adhesive layer side to the surface of the structure containing iron or a metal nobler than iron. Can be done.

Examples of the anticorrosion metal include elemental metals such as cadmium, chromium, zinc, manganese, aluminum and magnesium, and alloys thereof. Among these, zinc and aluminum are preferable, and zinc is particularly preferable.

The anticorrosion metal can be used in various shapes such as a particle shape, a scale shape, and a spindle shape, but the particle shape is preferable from the viewpoint of dispersibility and the like. The aspect ratio of the anticorrosion metal is preferably 1 to 3, more preferably 1 to 2. In the present specification, the aspect ratio is determined by the ratio (D / T) of the average particle size (D) and the average thickness (T). The average thickness (T) of the anticorrosion metal is obtained by measuring the thickness of the pigment using an SEM (scanning electron microscope) or an optical microscope and obtaining an average value for any 50 particles.

The average particle size of the anticorrosion metal is preferably 1 to 500 μm, more preferably 1 to 200 μm. In the present specification, the average particle size is measured by using a laser diffraction / scattering type particle size distribution measuring device, and the resulting 50% average particle size (particle size and median value totaling 50% on a volume basis). Means.

In the (A1) adhesive layer, the amount of the anticorrosive metal is, for example, 0.5 to 50% by mass, preferably 1 to 40% by mass. The anticorrosion metal may be used alone or in combination of two or more.

(A1) The adhesive layer may contain a rust preventive pigment. By blending a rust preventive pigment in the adhesive layer, it is possible to impart anticorrosive properties to the surface of the structure. Specific examples of the rust preventive pigment include zinc powder, zinc oxide, barium metaborate, calcium silicate, aluminum phosphate, aluminum tripolyphosphate, zinc phosphate, zinc phosphite, potassium phosphite, calcium phosphite, and phosphite. Examples thereof include aluminum, zinc calcium phosphate, zinc aluminum phosphate, zinc phosphate, aluminum phosphate, magnesium phosphate, vanadic acid / phosphate mixed pigment and the like.

In the (A1) adhesive layer, the amount of the rust preventive pigment is, for example, 0.5 to 10% by mass, preferably 1 to 7% by mass. The rust preventive pigment may be used alone or in combination of two or more.

In a preferred embodiment of the present invention, the (A1) adhesive layer may contain either an anticorrosive metal or an anticorrosive pigment, or may contain both an anticorrosive metal and an anticorrosive pigment.

(A1) The adhesive layer may contain a conductive material. In the present specification, the conductive material refers to a conductive material excluding anticorrosion metal. By using the conductive material, the conductivity of the adhesive layer is increased, and the effect of imparting anticorrosion property by the anticorrosion metal can be improved.

Examples of the conductive material include carbon-based materials, metal-based materials, metal oxide-based materials, ionic polymers, conductive polymers and the like. Specific examples of the carbon-based material include carbon black, graphite, graphene, carbon nanotubes, and acetylene black. Examples of the metal-based material include metals such as gold, silver, copper, and nickel, which have a higher potential than iron, or simple metals such as iron and alloys thereof. Examples of the metal oxide material include indium tin oxide (ITO), antimony trioxide (ATO), fluorine-doped tin oxide (FTO), zinc oxide and the like. Examples of the conductive polymer include polyacetylene, polypyrrole, PEDOT (polyethylenedioxythiophene), PEDOT / PSS (complex of polyethylenedioxythiophene and polystyrene sulfonic acid), polythiophene, polyaniline, poly (p-phenylene), polyfluorene, and the like. Examples thereof include polycarbazole, polysilane, and derivatives thereof. Examples of the ionic polymer include sodium polyacrylate, potassium polyacrylate and the like.

Conductive materials include those that are compatible with the adhesive layer and those that are dispersed in the adhesive layer. The conductive material can be used in various shapes such as a particle shape, a scale shape, and a spindle shape, but the particle shape is preferable from the viewpoint of dispersibility and the like. The conductive material has an aspect ratio of preferably 1 to 3, more preferably 1 to 2. The average particle size of the conductive material is preferably 1 to 500 μm, more preferably 1 to 200 μm.

In the (A1) adhesive layer, the amount of the conductive material is, for example, 0.5 to 30% by mass, preferably 1 to 20% by mass. The conductive material may be used alone or in combination of two or more.

(A1) Other components such as resin, saturated oil, unsaturated oil, liquid rubber, plasticizer, colorant, ultraviolet absorber, radical trapping agent (for example, hindered amine-based light stabilizer), extender pigment, etc. Various additives such as organic rust preventives, coupling agents, antioxidants, antiaging agents, antifungal agents, insect repellents, fungicides, antibacterial agents, and flame retardants can be blended.

The (A1) adhesive layer is formed by blending components that are appropriately selected as needed. For example, an adhesive layer can be formed by applying a composition containing an adhesive component or the like on the barrier layer and drying or curing the composition.

The thickness of the (A1) adhesive layer is, for example, 20 to 1,000 μm, preferably 20 to 900 μm, and more preferably 50 to 700 μm. Further, from the viewpoint of imparting self-healing property to the (A1) adhesive layer, the thickness of the (A1) adhesive layer is preferably 100 μm or more.

The adhesive layer (A1) may be a single layer or may be composed of a plurality of layers.

From the viewpoint of self-repairing property, the adhesive layer (A1) preferably has a elongation at break in the range of 50 to 2000%, and more preferably in the range of 100 to 1500%. (A1) The breaking elongation of the adhesive layer is preferably higher than the breaking elongation of the barrier layer or the surface protective coating film. The breaking elongation rate of the adhesive layer can be adjusted by appropriately selecting the type and amount of the adhesive component contained in the adhesive layer, the thickness of the adhesive layer, and the like.

In the present specification, the elongation at break is defined in 8. of JIS Z0237: 2009. It was measured according to the tensile strength and elongation.

(A2) The barrier layer protects the surface of the structure and prevents factors (deterioration factors) that deteriorate the surface of the structure, such as corrosion factors of metals such as water, oxygen, and chloride ions, from reaching the surface of the structure. It is a layer to prevent.

The barrier layer (A2) usually preferably contains a resin. Resins that can be used for the barrier layer include polyolefin resins such as polypropylene and polyethylene, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polyamide resins, polyimide resins, polyacrylic resins, polyurethane resins, and polystyrene resins. , Polyvinyl chloride resin, ethylene vinyl acetate resin, acrylonitrile resin (for example, acrylonitrile-butadiene-styrene copolymer (ABS resin)), polycarbonate resin, fluorine resin, polyvinyl alcohol resin, cellulose resin, Examples include phenolic resins. Among these, polyacrylic resins are preferable. These resins can be used as films or sheets. In addition, the barrier layer is woven or knitted with kraft paper, Japanese paper and other papers, natural fibers, polyester fibers, polyamide fibers, aramid fibers, vinylon fibers, carbon fibers, glass fibers, polyolefin fibers and other fibers. , Non-woven fabric, laminated cloth, metal foil and the like can also be used in combination with the above resin.

In the (A2) barrier layer, the amount of the resin is, for example, 40 to 100% by mass, preferably 50 to 90% by mass. The resin may be used alone or in combination of two or more.

^{(A2) The barrier layer has a water vapor permeability (JIS K7129) of 10 g / m 2} · day or less as an adhesive tape including the adhesive layer for the purpose of protecting the base material from corrosion factors such as water vapor in the atmosphere. Is preferable. Such a high level of water vapor permeation inhibitory ability can be realized by adjusting the composition of the resin and the crosslink density, combining a plurality of barrier layers, adjusting the thickness, blending scaly pigments and short fibers, and the like.

The scaly pigment is a pigment having a thin and flat shape like a foil, and specific examples thereof include metal pigments such as zinc, nickel, chromium, tin, copper, silver, platinum, gold, and aluminum, and glass flakes. , Tarku, mica, kaolin clay, mica-like iron oxide and the like. The metal pigment also includes an alloy pigment such as stainless steel. Further, the scaly pigment, for example, talc or mica, may be surface-treated with a metal oxide such as titanium oxide.

The scaly pigment preferably has an aspect ratio of 30 to 100, and more preferably 50 to 100, from the viewpoint of improving the barrier performance.

The scaly pigment preferably has an average particle size of 10 to 100 μm, and more preferably 20 to 60 μm.

In the present specification, the aspect ratio and the average particle size of the scaly pigment are obtained by the same method as for the anticorrosive metal.

In the (A2) barrier layer, the amount of the scaly pigment is preferably 1 to 30% by mass, more preferably 1 to 20% by mass, from the viewpoint of improving the barrier performance.

Examples of the short fiber include one or more kinds of fibers selected from the group consisting of natural fiber, polyester fiber, polyamide fiber, aramid fiber, vinylon fiber, carbon fiber, glass fiber and polyolefin fiber. The short fibers preferably have a fiber length of 3 to 50 mm. By dispersing the scaly pigment and short fibers in the adhesive layer and / or the barrier layer, the water vapor permeability can be reduced and the corrosion resistance of the base material can be improved.

In the barrier layer (A2), various additives such as a plasticizer, a colorant, a dispersant, an ultraviolet absorber, a radical scavenger (for example, a hindered amine-based light stabilizer), and an extender pigment can be blended as other components.

The barrier layer (A2) is preferably in the form of a film. The thickness of the (A2) barrier layer is, for example, 10 to 120 μm, preferably 10 to 100 μm, and more preferably 20 to 80 μm.

The barrier layer (A2) may be a single layer or may be composed of a plurality of layers.

The (A2) barrier layer has a breaking elongation rate in the range of, for example, 10 to 100%.

(A2) The front surface, the back surface, or both sides of the barrier layer may be subjected to treatments such as corona discharge treatment, plasma treatment, and primer treatment from the viewpoint of improving the adhesion to the adhesive layer and the surface protective coating film.

The surface protective coating material (B) used in the protective method of the present invention is used for painting the outer peripheral portion of the adhesive tape, and can prevent the adhesive tape from peeling off. The paint is superior in workability as compared with the case where a hot melt adhesive or the like is used. Further, by blending a pigment in the paint, it is possible to improve aesthetics, light resistance, and recoatability. In the present specification, the coating film formed by (B) the surface protective coating film may be referred to as a surface protective coating film.

The surface protective coating material preferably contains at least (B1) a coating film-forming resin, (B2) a pigment, and (B3) a solvent.

(B1) The coating film-forming resin is a component that remains as a resin constituting the coating film. For example, acrylic resin, silicone resin, acrylic silicone resin, styrene-acrylic copolymer resin, polyester resin, fluorine resin, rosin resin, petroleum resin. , Kumaron resin, phenol resin, urethane resin, melamine resin, urea resin, epoxy resin, cellulose resin, xylene resin, alkyd resin, aliphatic hydrocarbon resin, butyral resin, maleic acid resin, fumaric acid resin, vinyl resin, amine resin , Ketimine resin and the like. These resins may be used alone or in combination of two or more.

In the (B) surface protective coating material, the amount of the (B1) coating film-forming resin in the non-volatile content is preferably, for example, 15 to 50% by mass.

In the present specification, the non-volatile component refers to a component excluding volatile components such as water and an organic solvent, and is a component that finally forms a coating film. In this specification, the component remaining when the paint is dried at 105 ° C. for 60 minutes is treated as a non-volatile component. In the surface protective coating material (B), the amount of the non-volatile component is preferably 40 to 90% by mass, more preferably 50 to 80% by mass.

(B) The surface protective coating material may contain a curing agent. As the curing agent, a curing agent that is appropriately selected according to the type of resin to be used and is usually used in the coating industry can be used. These curing agents may be used alone or in combination of two or more. The content of the curing agent is appropriately adjusted according to the amount of reactive groups with the curing agent contained in the coating film-forming resin. In (B) the surface protective coating material, the curing agent in the non-volatile content The amount is preferably, for example, 1 to 15% by mass.

For example, an isocyanate-based curing agent can be preferably used for a resin containing a hydroxyl group. Specific examples include toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, 4,4'-methylenebis (cyclohexylisocyanate), methylcyclohexanediisocyanate, bis (isocyanatemethyl) cyclohexane, isophorone diisocyanate, In addition to diisocyanate diisocyanate and lysine diisocyanate, modified products of these polyisocyanates can be mentioned. Specific examples of the modified product include a biuret modified product, an isocyanurate modified product, an adduct modified product (for example, a trimethylolpropane adduct), an allophanate modified product, and a uretdione modified product.

Further, for the epoxy resin, an amine-based curing agent can be preferably used. Specific examples include aliphatic groups such as ethylenediamine, trimethylenediamine, tetramethylenediamine, pentamethylenediamine, triaminopropane, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, isophoronediamine, and 1,3-bisaminomethylcyclohexane. Polyamines; aromatic polyamines such as phenylenediamine, metaxylylene diamine, paraxylylene diamine, and diaminodiphenylmethane; other polyamines such as polyoxyethylenediamine, polyoxypropylenediamine, triethyleneglycoldiamine, and tripropyleneglycoldiamine. Examples thereof include compounds and modified polyamine compounds obtained by modifying the amino groups of these amine compounds. A known method can be used for the modification of the amine compound, and examples of the modification reaction include amidation of an amino group, a Mannich reaction of an amino group and a carbonyl compound, and an addition reaction of an amino group and an epoxy group. .. Here, a modified polyamine compound of the type in which an epoxy group or the like is added to an amino group is referred to as an adduct-type modified polyamine compound, and an epoxy adduct-type modified polyamine compound in which an epoxy group is added to an amino group is preferable.

(B2) Pigments include coloring pigments such as titanium dioxide, iron oxide and carbon black, extender pigments such as silica, talc, mica, calcium carbonate and barium sulfate, zinc, zinc phosphate, aluminum phosphate, zinc molybdate and metahou. Examples thereof include rust-preventive pigments such as barium sulfate and hydrocarbumite, bright pigments such as aluminum, nickel, chromium, tin, copper, silver, platinum, gold and stainless steel, and scaly pigments such as glass flakes and graphite. The pigment may be used alone or in combination of two or more.

(B) In the surface protective coating material, the pigment volume concentration (PVC) is preferably in the range of 10 to 40%, more preferably in the range of 13 to 35%. When the pigment volume concentration (PVC) is within the above-specified range, the effect of improving aesthetics, light resistance, and recoatability is high. In the present specification, the pigment volume concentration (PVC) means the pigment volume concentration (PVC: Pigment Volume Concentration) in the non-volatile component contained in the coating material, and is calculated from the composition and specific gravity of each component constituting the non-volatile component. Can be sought.

As the solvent (B3), an organic solvent, water or a mixed solvent thereof can be used. Here, the organic solvent is not particularly limited, and various organic solvents such as a hydrocarbon solvent, an alcohol solvent, a ketone solvent, an ester solvent, and an ether solvent can be used. The organic solvent may be used alone or in combination of two or more.

Examples of the hydrocarbon solvent include aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, and more specifically, toluene, xylene, solvent naphtha, mineral spirit, hexane, cyclohexane, and octane. , Solvent oil and the like can be exemplified. Examples of the alcohol solvent include methanol, ethanol, butanol and the like, examples of the ketone solvent include acetone, methyl ethyl ketone and methyl isobutyl ketone, and examples of the ester solvent include ethyl acetate. , Butyl acetate and the like, and examples of the ether solvent include ethylene glycol monoethyl ether and methyl carbitol. Solvents having both hydroxyl groups and ether bonds, such as ethylene glycol monoethyl ether and methyl carbitol, are classified as ether solvents as described above.

In the surface protective coating material (B), the amount of the solvent (B3) is preferably 10 to 50% by mass, more preferably 20 to 45% by mass.

(B) In the surface protective paint, as other components, a plasticizer, a colorant, a dispersant, a desiccant, an antioxidant, a reaction catalyst, a defoaming agent, a dehydrating agent, a leveling agent, an anti-settling agent, and an anti-sagging agent. , Adhesive-imparting agents such as silane coupling agents, algae-proofing agents, fungicides, preservatives, dispersants, ultraviolet absorbers, radical trapping agents (for example, hindered amine-based light stabilizers) and other additives as needed. It may be blended as appropriate.

(B) The surface protective coating material can be prepared by mixing various components appropriately selected as necessary. When (B) the surface protective paint is a two-component reaction-curable paint, a main agent is prepared in advance by mixing various components appropriately selected as necessary, and the main agent and the curing agent are used at the time of painting. Can be prepared by mixing. The curing agent may be the curing agent as it is, or may be a mixture with other components.

The surface protective paint (B) is preferably a reaction-curable paint such as a one-component reaction-curable paint or a two-component reaction-curable paint because it is excellent in durability of the coating film and adhesion to the barrier layer.

(B) The surface protective coating material has a viscosity of 0.1 to 10,000 (Pa · s, 23 ° C.) at ^{a shear rate of 0.1 s -1 and a viscosity at a shear rate of 1,000 s -1} . It is preferably 05 to 10 (Pa · s, 23 ° C.).

In the present specification, the viscosity is measured after adjusting the liquid temperature to 23 ° C. using a rheometer (such as a rheometer ARES manufactured by TA Instruments).

(B) The coating means of the surface protective coating material is not particularly limited, and known coating means such as spray coating, roller coating, brush coating, iron coating, spatula coating and the like can be used. Further, the means for drying the surface protective coating material (B) is not particularly limited, and may be either natural drying at an ambient temperature or forced drying using a dryer or the like.

(B) The thickness of the coating film formed from the surface protective coating film, that is, the surface protective coating film is, for example, 10 to 120 μm, preferably 10 to 100 μm, and more preferably 20 to 80 μm. It is also possible to perform a plurality of coatings (overcoating) in order to obtain a desired film thickness. It is also possible to form a surface protective coating film by using two or more kinds of paints.

(B) The coating film formed from the surface protective coating film, that is, the surface protective coating film, has a breaking elongation rate in the range of, for example, 0.5 to 50%. In a preferred embodiment of the present invention, from the viewpoint of self-repairing property, (A1) the elongation at break of the adhesive layer is set to be high, and therefore (B) the surface protective coating film formed from the surface protective coating material is broken. The elongation rate is lower than the breaking elongation rate of the (A1) adhesive layer.

In the protective construction method of the present invention, (A) adhesive tape is attached to the surface of the structure, and coating is performed so as to cover the end portion of the (A) adhesive tape with (B) surface protective paint. As a result, the surface of the structure can be protected, peeling of the adhesive tape can be prevented, and aesthetics, weather resistance, and recoatability can be preferably imparted.

In the protection method of the present invention, the surface roughness of the surface to which the adhesive tape (A) is attached is preferably 80 μm or less, and more preferably 50 μm or less. By smoothing the surface to which the adhesive tape is attached, the adhesiveness of the adhesive tape to the surface of the structure can be improved. For example, when the surface roughness of the structure surface exceeds 80 μm, the surface roughness can be reduced by blasting or power tooling the structure surface.

In the present specification, the surface roughness is a ten-point average roughness (Rzjis) measured according to JIS B 0601: 2001.

In the protective method of the present invention, the region of (A) the adhesive tape covered with (B) the surface protective paint is preferably a region up to a position 10 mm or more away from the end of the (A) adhesive tape. Further, in the protection method of the present invention, (A) the adhesive tape is peeled off, and in particular, (B) the surface protective paint is used to prevent the peeling of the end portion of the adhesive tape. It is not necessary to cover the entire region of the adhesive tape, and (A) the outer peripheral portion of the adhesive tape, preferably the entire circumference of the outer peripheral portion, may be covered. Therefore, in the protective method of the present invention, the region of the (A) adhesive tape covered with the (B) surface protective paint is preferably a region up to a position 50 mm away from the end of the (A) adhesive tape. ..

Although the protective construction method of the present invention can be applied to a structure at the time of new construction, it is preferable to apply it to an existing structure, and it is preferable that it is a method for repairing an existing structure. Implementing the protective construction method of the present invention when repairing an existing structure has great effects such as shortening the construction period and ease of construction. When repairing a structure, if an old coating film is formed on the surface of the structure, it is preferable to remove the old coating film, smooth the surface of the structure, and then attach an adhesive tape. Further, if there are scratches or rust on the surface of the structure, it is preferable to remove them or protect the surface, smooth the surface of the structure, and then attach the adhesive tape. Further, when repairing the structure, the adhesive tape may be hollowed out into a desired shape, attached, and then the end portion thereof may be painted with a surface protective paint.

In a preferred embodiment of the present invention, the structure surface protection method is a method for repairing an existing structure, and the structure surface is repaired by any one of the following patterns 1 to 3 or a combination thereof. conduct.
(Pattern 1)
If there is a dented damaged part on the surface of the structure, after protecting the dented damaged part with (C) anticorrosive paint and / or (D) elastic paint, the (C) anticorrosive paint and / or (D) ) The (A) adhesive tape is attached so as to cover the surface protected by the elastic paint, and the end portion of the (A) adhesive tape is protected by the (B) surface protective paint.
(Pattern 2)
If there is rust or deterioration of the coating film on the surface of the structure, after cleaning the surface of the structure, (A) adhesive tape is attached to the surface of the structure, and the end of the (A) adhesive tape is attached to (B). ) Protect with surface protective paint (here, the surface of the structure that has been cleaned may be painted with (C) anticorrosive paint before applying (A) adhesive tape).
(Pattern 3)
If there are no scratches or rust on the surface of the structure, after cleaning the surface of the structure, (A) adhesive tape is attached to the surface of the structure, and the end of the (A) adhesive tape is (B) surface protected. Protect with paint.

Regarding the pattern 1, as a more specific embodiment, (C) anticorrosion paint and / or (D) elastic paint is applied to the dented damaged portion on the surface of the structure, and the coating film formed is dented. Protect damaged objects. Next, (A) an adhesive tape is attached so as to cover the recessed damaged portion protected by the coating film, and then (A) the end portion of the adhesive tape is painted with (B) surface protective paint to protect the surface. The coating film protects (A) the end of the adhesive tape.

As a more specific embodiment of the pattern 2, the surface of the structure having rust or deterioration of the coating film is cleaned to remove the rust or the old coating film. Then, if necessary, the surface of the structure is painted with (C) anticorrosion paint to form an anticorrosion coating film. Next, (A) adhesive tape is attached to the surface of the structure from which rust and the old coating film have been removed, or the surface of the structure having the anticorrosion coating film, and then (B) the edge of the adhesive tape is applied with (B) surface protective paint. The part is painted, and the end part of the adhesive tape (A) is protected by a surface protective coating film.

As a more specific embodiment of the pattern 3, the surface of the structure is cleaned. Next, (A) adhesive tape is attached to the surface of the cleaned structure, then (A) the end of the adhesive tape is painted with (B) surface protective paint, and (A) the adhesive tape is coated with the surface protective coating film. Protect the edges.

The (C) anticorrosive paint is a paint for imparting anticorrosive properties to the surface of a structure, and preferably contains a metal having a lower potential than iron and / or a rust preventive pigment.

(D) The elastic coating material is a coating material capable of forming an elastic coating film, and is suitable for coating concave portions. The elastic coating material (D) preferably contains a highly flexible coating film-forming resin, and a commercially available putty material or elastic resin coating material can be preferably used.

Examples of (C) antifungal paints and (D) elastic paints include resins, pigments, water, organic solvents, desiccants, antioxidants, reaction catalysts, dispersants, defoamers, dehydrating agents, leveling agents, and sedimentation inhibitors. Adhesive-imparting agents such as anti-drip agents and silane coupling agents, algae-proofing agents, antifungal agents, preservatives, ultraviolet absorbers, radical trapping agents (for example, hindered amine-based light stabilizers) and the like are appropriately added as necessary. be able to. The (C) anticorrosion coating material and the (D) elastic coating material can be prepared by mixing various components appropriately selected as necessary.

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

(Example of preparation of surface protective paint)
A main agent and a curing agent were prepared according to the formulation shown in "Main agent" and "Curing agent" in Tables 1 to 4, and a surface protective coating material was prepared from these. In Examples 27 and 28, a surface protective coating material composed of a main agent was prepared. The values of the formulation in the table are parts by mass. The PVC of the surface protective coating material in the table is the pigment volume concentration (%) in the non-volatile content contained in the surface protective coating material.

Details of the materials used for the main agent and the curing agent are as follows.
Resin 1: Lumiflon LF400, manufactured by Asahi Glass Co., Ltd., strong solvent-based fluororesin, non-volatile content 50% by mass, OHV = 21
Resin 2: Made by Asahi Glass Co., Ltd., weak solvent-based fluororesin, non-volatile content 60% by mass, OHV = 19.5
Resin 3: Lumiflon FE4400, manufactured by Asahi Glass Co., Ltd., water-based fluororesin, non-volatile content 50% by mass, OHV = 24.5
Resin 4: Lumiflon LF810, manufactured by Asahi Glass Co., Ltd., weak solvent-based fluororesin, non-volatile content 45% by mass, OHV = 4
Resin 5: Polydurex G633, Asahi Kasei emulsion resin, non-volatile content 46% by mass
Hardener 1: Coronate HX, manufactured by Tosoh, non-volatile content 100% by mass, polyisocyanate, NCO = 21.25% by mass
Hardener 2: Coronate 2770, manufactured by Tosoh Corporation, non-volatile content 100% by mass, polyisocyanate, NCO = 19.4% by mass
Hardener 3: Aquanate 200, manufactured by Tosoh, non-volatile content 100% by mass, polyisocyanate, NCO = 12% by mass

(Example of manufacturing adhesive tape)
An example of producing the adhesive tape of Example 1 shown in Table 1 will be described below.
As a monomer (monomer), 85 parts by mass of 2-ethylhexyl acrylate, 15 parts by mass of n-butyl acrylate, 5 parts by mass of acrylic acid, and as a photopolymerization initiator, trade name Irgacure 651 (manufactured by Ciba Specialty Chemical). 0.05 parts by mass and 0.05 parts by mass of trade name irgacure 184 (manufactured by Ciba Specialty Chemical Co., Ltd.) were blended and irradiated with ultraviolet rays in a nitrogen atmosphere to obtain a partially polymerized syrup. Next, 0.1 part by mass of 1,6-hexanediol diacrylate and 0.2 part by mass of the solid content were added to 100 parts by mass of the prepared syrup, and hollow glass beads (hollow microspheres) were further added. ), 1 part by mass of the trade name Cellstar Z-27 (manufactured by Tokai Kogyo Co., Ltd., true density: 0.27, average particle size: 63 μm), 5 parts by mass of zinc particles as filler 1, and an olefin polymer. (Kurare Co., Ltd., L-1253) was added in an amount of 10 parts by mass, and a tackifier (Arakawa Chemical Industry Co., Ltd., Alcon P140, hydrogenated petroleum resin) was added in an amount of 10 parts by mass to obtain an acrylic resin-based pressure-sensitive adhesive.

Next, the pressure-sensitive adhesive was applied to the peel-treated PET base material (separator) so as to have a thickness of 1.0 mm, and the peel-treated PET base material was adhered thereto, and the illuminance was about 4. The (A1) adhesive layer having a thickness of 600 μm was obtained by irradiating with ultraviolet rays (UV light) at 0 mW / cm ^{2 for 10 minutes.} An adhesive tape was obtained by laminating the obtained adhesive layer on a (A2) barrier layer, a fluororesin film having a thickness of 38 μm (Tedler film TGH15BL3 manufactured by DuPont).

An example of producing an adhesive tape different from the adhesive tape of Example 1 is as follows.
(A1) Type and content of resin of adhesive layer, type and content of filler 1, type and content of filler 2, thickness, (A2) Type of base material of barrier layer, scaly pigment or short fiber An adhesive tape was obtained in the same manner as the adhesive tape of Example 1 except that the type, content, and thickness of the above were changed to those shown in Tables 1 to 4 as necessary. The ultraviolet irradiation conditions were appropriately adjusted so that the gel fraction was 50 to 70% by mass.
In Example 15, a polyolefin multilayer film (Technosen Hikari, manufactured by Nissin Chemical Industry Co., Ltd.) was used as the base material of the barrier layer.
In Example 16, a non-woven fabric that had been previously coated and dried with a paint V-fluorocarbon HB Clean Smile (weak solvent two-component thick film type fluororesin paint) manufactured by Dainippon Paint Co., Ltd. was used as the base material of the barrier layer.

The water vapor transmission rate of the adhesive tape was measured by the method described in JIS K7129 and is shown in Tables 1 to 4. The unit is g / m ² · day.

JIS Z0237: 2009 8. The elongation rate (%) of the coating film formed from (A1) the adhesive layer, (A2) the barrier layer, and (B) the surface protective coating film was measured according to the tensile strength and elongation, and is shown in Tables 1 to 4, respectively. ..

(Examples 1-38 and Comparative Examples 1-5)
Adhesiveness test, self-healing test, weather resistance test, and recoatability test were performed using the surface protective paint prepared according to the above preparation example and the adhesive tape prepared according to the above preparation example. The results are shown in Tables 1 to 4.
In Comparative Example 1, the end of the tape is not protected by the surface protective paint.
In Comparative Example 2, instead of the surface protective paint, the width of the tape end portion of 10 mm was protected with a hot melt adhesive (manufactured by Toagosei Co., Ltd., trade name: PES-111EE).
In Comparative Example 3, instead of the surface protective paint, the width of the tape end portion of 10 mm was protected with a modified silicone-based sealant (manufactured by Konishi Co., Ltd., trade name MPX-1).
The adhesive tape used in Comparative Example 4 did not have a barrier layer.
In Comparative Example 5, the adhesive layer was formed with an instant adhesive.
In Example 10, Cemedine EP001K (manufactured by Cemedine, epoxy / modified silicone elastic adhesive) was used for the adhesive layer.

[Preparation of test sample 1]
As a test plate, a grit blasted steel plate (150 x 150 x 3.2 mm) with an ISO 8501-1 Sa2.5 substrate adjustment degree, Zetter OL-HB manufactured by Dai Nippon Toryo Co., Ltd., Eponix # 30 Undercoat HB, V Freon # The 100H intermediate coating and V Freon # 100H topcoat IG were coated and dried according to the standard coating specifications to obtain a test plate having an existing coating film. Then, the central portion of the sufficiently dried test plate was cleaned with a size of 50 mm × 50 mm to a depth at which the base of the steel sheet could be confirmed, and adjusted so as to have the surface roughness shown in Tables 1 to 4. Next, after laminating 60 mm × 60 mm adhesive tape so that the adhesive layer serves as the adhesive layer so that the exposed base surface is completely covered, the coating width from the end of the adhesive tape is shown in Tables 1 to 1. As a surface protective coating material, the coating material obtained by mixing the main agent and the curing agent shown in Tables 1 to 4 has a thickness of 25 to 35 μm after being dried using a brush so as to have a value shown in 4. And dried in a constant temperature room maintained at a temperature of 23 ° C. and a relative humidity of 50% for 7 days to form a paint coating film, and a test sample 1 was obtained.

The surface roughness of the test sample 1 before applying the tape was determined from the ten-point average roughness (Rzjis) measured according to JIS B 0601: 2001, and is shown in Tables 1 to 4.

<Adhesiveness>
Adhesion test according to JIS Z 9117: 2011 8.7 was performed on the test sample 1. The measurement is performed by cutting from a 60 mm x 60 mm adhesive tape to a size of 25 mm x 60 mm, supporting it horizontally downward, grasping the short side with a gripping jig, and holding an 800 g weight vertically and quietly for 1 hour including the gripping jig. The peeling length when hanging was measured.
⊚: Peeling length is 0 mm to less than 5 mm 〇: Peeling length is 5 mm to less than 10 mm ×: Peeling length is 10 mm or more

<Self-healing>
A cross-shaped notch that reaches the substrate is made in the center of the test sample 1 according to JIS-5600-7-9: 2006 7.5 (how to make a notch), and after 24 hours, JIS-5600- It was subjected to the cycle corrosiveness test (cycle D) specified in 7-9 “Cycle Corrosion Test Method”. The coating film after 360 cycles from the start of the test was evaluated according to the following criteria.
⊚: The cut flaw was repaired by the self-healing property of the adhesive layer, and no deterioration was observed in the appearance of the coating film even after 2000 hours.
◯: The cut scratches were repaired by the self-healing property of the adhesive layer, and no deterioration was observed in the appearance of the coating film after 1000 hours, but some deformations such as slight swelling and rust were observed within 2000 hours. Admitted.
Δ: Although the notch flaw was repaired by the self-healing property of the adhesive layer, there was a part where the protective function was insufficient, and a slight swelling, rust, or other deformation was observed within 1000 hours. ×: The notch flaw was found. The self-repairing property of the adhesive layer was not sufficient for repair, and the surface of the base material was exposed, and the coating film after the test showed deformation such as swelling, rust, cracks, and peeling.

<Weather resistance 1> Accelerated test: Cold cycle test A cold cycle test using a sunshine carbon arc lamp type tester according to JIS K5400 9.8.1 is shown below for the test sample 1 prepared by the above method. 500 cycles were carried out with the procedure as one cycle, and the state of the test plate was visually judged according to the following criteria.
(procedure)
1. 1. Raise the temperature from -20 ° C to 50 ° C over 2 hours 2.1 hours in an atmosphere of -20 ° C Raise the temperature from 50 ° C to -20 ° C over 2 hours 4.1 hours in an atmosphere of 3.50 ° C. Lower (judgment criteria)
◯: No change was observed in the coating film and tape. Δ: Cracks and cracks were observed in a part of the coating film and tape, but no rust or swelling was observed.
X: The end of the tape is peeled off, and abnormalities such as rust and swelling are observed on the test plate.

<Weather resistance 2> Exposure test: Contamination resistance test The test sample 1 prepared by the above method was subjected to an exposure test for one month along a national highway with heavy traffic, and the surface condition was visually evaluated.
◯: There is no change in the coating film and tape, and the aesthetic appearance is maintained.
X: Dirt adheres to the surface, or rust or blisters occur, resulting in poor aesthetics.

<Recoating property>
<Weather resistance 2> Exposure test: After cleaning and drying the surface of the test plate after performing the stain resistance test, Dainippon Paint Co., Ltd. paint V Freon HB Clean Smile (weak solvent 2-component thick film type) The entire surface was coated with a fluorocarbon resin paint) and dried in a thermostatic chamber maintained at a temperature of 23 ° C. and a relative humidity of 50% for 7 days. A cross cut was formed on the surface of the obtained test plate so that the end face of the tape became the center, and an adhesive tape was attached to the surface of the cross cut portion, and the state of the coating film after being rapidly peeled off was visually evaluated.
(Evaluation criteria)
⊚: No peeling is observed.
◯: Peeling of less than 2 mm is observed around the cut portion.
X: Peeling of 2 mm or more is observed in the peripheral portion of the cut portion. Alternatively, partial or total peeling is observed.

Claims (10)

A method for protecting the surface of a structure using (A1) an adhesive layer, (A2) an adhesive tape having a barrier layer, and (B) a surface protective paint.
The (A) adhesive tape is attached to the surface of the structure, and the outer peripheral portion of the (A) adhesive tape is painted so as to cover the end portion of the (A) adhesive tape with the (B) surface protective paint .
The region of the (A) adhesive tape covered with the (B) surface protective paint is a region up to a position 10 mm or more away from the end of the (A) adhesive tape.
The breaking elongation of the surface protective coating film formed from the (B) surface protective coating is in the range of 0.5 to 50%, which is lower than the breaking elongation of the (A1) adhesive layer.
(A1) A method for protecting the surface of a structure, wherein the elongation at break of the adhesive layer is within the range of 50 to 2000%. The (B) surface protective coating material contains at least (B1) a coating film-forming resin, (B2) a pigment, and (B3) a solvent, and the pigment volume concentration (PVC) of the (B) surface protective coating material is in the range of 10 to 40%. The method for protecting the surface of a structure according to claim 1, wherein the method is inside. The method for protecting the surface of a structure according to claim 1 or 2, wherein the surface protective coating material (B) is a reaction-curable coating material. The method for protecting the surface of a structure according to any one of claims 1 to 3, wherein the surface protective coating material (B) is a two-component reaction-curable coating material. The method for protecting the surface of a structure according to any one of claims 1 to 4, wherein the adhesive layer (A1) contains a metal having a lower potential than iron and / or a rust preventive pigment. The method for protecting the surface of a structure according to any one of claims 1 to 5, wherein the adhesive layer (A1) contains an adhesive component. The method for protecting the surface of a structure according to any one of claims 1 to 6 , wherein the surface roughness of the surface to which the adhesive tape (A) is attached is 80 μm or less. (B) the surface protective coating, the viscosity at a shear rate of 0.1s ^-1 is 0.1~10,000 (Pa · s, 23 ℃ ), viscosity at a shear rate of 1000 s ^-1 is 0.05 to 10 The method for protecting the surface of a structure according to any one of claims 1 to 7 , which is (Pa · s, 23 ° C.). The thickness of the (A1) adhesive layer is in the range of 20 to 1,000 μm, the thickness of the (A2) barrier layer is in the range of 10 to 100 μm, and is formed by the (B) surface protective coating material. The method for protecting the surface of a structure according to any one of claims 1 to 8 , wherein the thickness of the surface protective coating film is in the range of 10 to 100 μm. It is a method for repairing an existing structure by the structure surface protection method according to any one of claims 1 to 9, and the structure surface can be repaired by any one of the following patterns 1 to 3 or a combination thereof. A method for repairing an existing structure, characterized in that repair is performed.
(Pattern 1)
If there is a dented damaged part on the surface of the structure, after protecting the dented damaged part with (C) anticorrosive paint and / or (D) elastic paint, the (C) anticorrosive paint and / or (D) ) The (A) adhesive tape is attached so as to cover the surface protected by the elastic paint, and the end portion of the (A) adhesive tape is protected by the (B) surface protective paint.
(Pattern 2)
If there is rust or deterioration of the coating film on the surface of the structure, after cleaning the surface of the structure, (A) adhesive tape is attached to the surface of the structure, and the end of the (A) adhesive tape is attached to (B). ) Protect with surface protective paint (here, the surface of the structure that has been cleaned may be painted with (C) anticorrosive paint before applying (A) adhesive tape).
(Pattern 3)
If there are no scratches or rust on the surface of the structure, after cleaning the surface of the structure, (A) adhesive tape is attached to the surface of the structure, and the end of the (A) adhesive tape is (B) surface protected. Protect with paint.