WO2023058726A1 - Structure protection sheet and method for installing structure protection sheet - Google Patents

Abstract

Provided are: a structure protection sheet with which wrinkles and air trapping are minimized even when a wide structure protection sheet is attached to the surface of a structure, and with which there are no wrinkles or gaps even in the surface of a structure provided with a plurality of parallel level differences, the structure protection sheet being installable with exceptional efficiency; and a method for installing the structure protection sheet. This structure protection sheet has a release sheet, an adhesive layer, a polymer cement hardening layer, and a resin layer provided in the stated order and is attached to the surface of a structure, the structure protection sheet being characterized in that one or more slits are formed in the release sheet.

Description

Structure protection sheet and construction method of structure protection sheet

The present invention relates to a structure protection sheet and a construction method for the structure protection sheet. More specifically, even when a wide structure protection sheet is attached to the surface of a structure, it suppresses the occurrence of wrinkles and air entrapment, and is suitable for providing a protection sheet on the surface of a structure having a plurality of parallel steps. The present invention relates to a structure protection sheet capable of greatly reducing the construction period and protecting a structure for a long period of time without generating wrinkles or forming gaps with the surface of the structure, and a construction method for the structure protection sheet. .

Roofs of structures such as general houses and commercial buildings may cause rain leakage when they are deteriorated by exposure to wind and rain for a long period of time or damaged by disasters such as typhoons.
When the roof of a structure deteriorates or is damaged, emergency measures are required. Currently, as an emergency measure for the roof of a structure, for example, as shown in FIG. A general method is to place a blue sheet 31 on the blue sheet 31 and arrange a plurality of sandbags 32 as weights on the blue sheet 31 .
In addition to the method of placing the blue sheet 31 using a weight such as a sandbag 32, for example, Patent Document 1 and Patent Document 2 propose a method of fixing the blue sheet using a bag filled with water. It is

Utility Model Registration No. 3225057 Utility Model Registration No. 3116572

In recent years, slate roofs are widely used as building roofs, but slate roofs are non-flat surfaces with multiple parallel steps, and conventional blue sheets are used for such roofs. In repairing the old roof, it is difficult to prevent wrinkles in the blue sheet, and there is a gap between the blue sheet and the roof, and there is a problem that water cannot be prevented from entering through this gap.
Moreover, even if the roof of a building has no steps, it is difficult to repair a wide blue sheet without causing wrinkles or air trapping.
In addition, since the weather resistance of the blue sheet is usually not very high, it deteriorated after about one year and had to be replaced.

The present invention has been made in view of such a conventional situation, and its object is to suppress the occurrence of wrinkles and air entrainment even when a wide structure protection sheet is attached to the surface of a structure. To provide a structure protection sheet which can be applied very efficiently without wrinkles and gaps even on the surface of a structure having a plurality of parallel steps, and a method for applying the structure protection sheet. It is in.

As a result of intensive studies on repair methods for the surface of a structure, the present inventors found that a protective sheet with a specific configuration having an adhesive layer instead of a blue sheet is pasted along the steps on the surface of the structure. It is possible to eliminate the gap between the surface of the object and to give the protective sheet a performance according to the characteristics of the surface of the structure, specifically, to follow the cracks and expansion that occur in the slate roof etc. It is also equipped with the followability, waterproofness that does not allow permeation of degrading factors such as water and chloride ions, salt shielding, neutralization prevention, and water vapor permeability that allows the moisture in the roof to be discharged as water vapor. We have realized the provision of a layer that secures the strength of the sheet itself.
However, a protective sheet provided with an adhesive layer is stored in a state in which a release sheet is attached to the adhesive layer, and the release sheet is peeled off during construction to expose the adhesive layer before being transferred to the surface of the structure. However, it is difficult to suppress the occurrence of wrinkles and air entrainment with a wide protective sheet, and the surface of the structure has an uneven shape, specifically a shape with parallel steps like a slate roof. In this case, unintentional sticking may occur on the stepped part or other flat part when attaching to the flat part between the steps. It was extremely difficult to go to
Therefore, as a result of further intensive studies by the present inventors, slits are provided in the release sheet for each part to be pasted on the surface of the structure, and only the release sheet facing the part to be pasted on the surface of the structure is peeled off. By exposing the adhesive layer, even with a wide protective sheet, wrinkles and air trapping can be prevented, and even with structures with parallel steps on the surface, it is extremely efficient and The inventors have found that the protective sheet can be attached without wrinkles and gaps, and completed the present invention.

(1) The structure protection sheet according to the present invention is a structure protection sheet provided with a release sheet, an adhesive layer, a polymer cement hardened layer and a resin layer in this order, and is used by bonding to the surface of a structure. 1 or 2 or more slits are formed in the release sheet.

According to this invention, it is possible to attach the release sheet to the surface of the structure by peeling off only the release sheet corresponding to the portion to be attached, even if the width is wide, so that the occurrence of wrinkles and the occurrence of air entrapment can be suitably prevented. can. In addition, even on the surface of a structure with steps, it is possible to apply the structure protection sheet efficiently without wrinkles and gaps by peeling off only the release sheet on the part to be pasted and exposing the adhesive layer. becomes.
In addition, since the structure protection sheet can be mass-produced by coating and drying processes on the factory production line, it is possible to reduce costs, significantly reduce the work period on site, and achieve long-term protection of structures.
Furthermore, since an adhesive layer is formed on the surface of the polymer cement hardening layer in advance, the structure protection sheet can be attached to the surface of the structure through the adhesive layer without forming an adhesive layer by applying an adhesive at the work site. can be pasted, and work efficiency is extremely excellent.

(2) The present invention is preferably the structure protection sheet according to (1) above, wherein the release sheet has slits formed in the longitudinal direction.

According to this invention, construction can be performed extremely efficiently without wrinkles or gaps on the surface of structures such as slate roofs.

(3) In the present invention, a plurality of linear steps are formed parallel to each other on the surface of the structure, and the slits formed in the release sheet are located at the corners formed by the steps. It is preferable that the structure protection sheet according to (1) or (2) above is formed in

According to the present invention, even on the surface of a structure having steps, only the release sheet on the part to be pasted is peeled off to expose the adhesive layer, so that the structure protection sheet can be efficiently applied without wrinkles and gaps. Construction becomes possible.

(4) The present invention is preferably a structure protection sheet according to (1), (2) or (3) above, further comprising a mesh layer.

According to this invention, since it has a mesh layer, it is possible to impart excellent performance such as strength to the structure protection sheet according to the invention.

(5) In the present invention, it is preferable that the adhesive layer is the structure protection sheet described in (1), (2), (3) or (4) above, which contains an acrylic pressure-sensitive adhesive as a main component.

Acrylic pressure-sensitive adhesives have a high degree of freedom in material design, and are also excellent in transparency, weather resistance, and heat resistance. can.

(6) The present invention provides the above (1), (2), (3), and (4) having an adhesive force of 0.5 N/mm ² or more when attached to the surface of the structure via an adhesive layer. ) or (5).

According to this invention, the surface of a structure can be strongly protected over a long period of time by the structure protection sheet according to the invention.

(7) The present invention is the structure protection sheet according to (1), (2), (3), (4), (5) or (6), wherein the adhesive layer has a thickness of 50 to 500 μm. Preferably.

According to this invention, it is possible to make the adhesive force excellent when attached to the surface of the structure, and to strongly protect the surface of the structure over a long period of time with the structure protection sheet according to the present invention.

(8) In the present invention, the polymer cement-hardened layer is a layer containing a cement component and a resin and containing 10% by weight or more and 40% by weight or less of the resin. The structure protection sheet described in (2), (3), (4), (5), (6) or (7) is preferred. More preferably, the resin content is 20% by weight or more and 30% by weight or less.

According to this invention, the polymer cement hardening layer is a layer with excellent conformability and good compatibility, so the adhesion of the layer itself is excellent. Furthermore, the cement component contained in the polymer-cement-hardened layer on the structure side acts to enhance adhesion to structures such as concrete.

(9) The present invention provides a method for applying a structure protection sheet according to (3), (4), (5), (6), (7) or (8) above, wherein disposing the structure protection sheet on the surface of the structure so that the slits of the release sheet face each other; The method is characterized by comprising a step of exposing an adhesive layer by peeling, and a step of attaching the exposed adhesive layer to the surface of the structure.

According to this invention, when the structure protection sheet is attached to the surface of the structure, only the release sheet of the part to be attached to the surface of the structure is peeled off to expose the adhesive layer, and the part other than the part to be attached is adhered. Since the layer can be covered with the release sheet, the adhesive layer is not unintentionally attached when the structure protection sheet is applied. As a result, even on a flat surface having parallel steps, the structure protection sheet can be adhered extremely efficiently without creases and gaps.

According to the present invention, even when a wide structure protection sheet is attached to the surface of a structure, the occurrence of wrinkles and air trapping can be suppressed, and the surface of a structure with steps can be easily repaired without gaps. Moreover, it is possible to provide a construction method for a structure protection sheet that can be used for a long period of time. In particular, the structure protection sheet should be given performance according to the characteristics of the surface of the structure so that it can follow the cracks and expansion that occur on the surface of the structure, and the deterioration factors such as water and chloride ions on the surface of the structure. It is possible to provide a construction method using a structure protection sheet that can prevent the penetration of . Furthermore, at the construction site, it has the advantage of being able to improve the stability and uniformity of quality compared to the method of manually coating multiple layers with a paint for repairing rain leaks.

BRIEF DESCRIPTION OF THE DRAWINGS (A) and (B) are sectional block diagrams which show an example of the structure protection sheet based on this invention. (A) and (B) are schematic diagrams showing how the structure protection sheet according to the present invention is attached to a structure. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows typically an example of the structure protection sheet of this invention. (a) to (c) are schematic diagrams showing an example of the construction method of the structure protection sheet of the present invention, and (d) is an enlarged sectional view. (A) and (B) are cross-sectional configuration diagrams showing another example of the structure protection sheet according to the present invention. (A) and (B) are schematic diagrams showing an example of the mesh layer of the structure protection sheet according to the present invention. It is explanatory drawing of the conventional repair method of a roof. (a) and (b) are schematic diagrams of a structure protection sheet according to an example.

The structure protection sheet of the present invention and the construction method of the structure protection sheet will be described below with reference to the drawings. The present invention can be modified in various ways as long as it has the technical features, and is not limited to the following description and drawings.

[Structure protection sheet]
The structure protection sheet according to the present invention is used by being attached to the surface of a structure, and has a resin layer on the outermost surface when attached to the structure.
As shown in FIG. 1, the structure protection sheet 10 according to the present invention has an adhesive layer 15, a polymer cement hardening layer 12 and a resin layer 13 provided in this order. Both the polymer cement hardened layer 12 and the resin layer 13 may be formed as single layers as shown in FIG. 1(A), or may be formed as laminated layers as shown in FIG. 1(B). may be Another layer may be provided between the polymer cement hardened layer 12 and the resin layer 13 depending on the required performance.

The structure protection sheet 10 according to the present invention preferably has a water vapor transmission rate of 10 to 50 g/m ² ·day. Since the hardened polymer cement layer 12 contains a cement component, it can be expected to have a certain level of water vapor transmission rate, but the resin layer 13 provided on the hardened polymer cement layer 12 has a poor water vapor transmission rate. Presumably, such a problem does not occur in the present invention, and since the water vapor transmission rate of the entire structure protection sheet 10 is within a predetermined range, water vapor inside the structure protection sheet 10 can be removed after it is attached to a structure such as concrete. Since it can be suitably permeated and discharged to the outside, it is possible to suitably prevent the occurrence of blistering and further prevent deterioration of adhesiveness. The advantage of having a water vapor transmission rate within a predetermined range is that, because of the structure that allows vapor to escape easily, corrosion of metal (for example, reinforcing bars) in the structure tends to be suppressed. When the structure protection sheet 10 is applied to a structure on a rainy day, the surface of the structure is wet and the structure itself contains moisture. has the above-mentioned water vapor transmission rate, water permeated into the structure after construction (after manufacture of the reinforced structure) can easily escape to the outside. Furthermore, concrete immediately after hardening contains a lot of moisture inside, and the structure protection sheet 10 according to the present invention can be suitably used for such concrete as well.
Another advantage of the structure protection sheet 10 according to the present invention is that its water vapor transmission rate can be controlled, so that it can be attached to the surface of the structure even when the cement of the structure is not hardened, for example. at the point. That is, when the cement is molded and hardened, if water is rapidly removed, the cement becomes porous and the strength of the structure tends to decrease. By attaching it, it is possible to control the speed of water removal when the cement hardens, and there is also the advantage that it becomes easier to avoid the porous structure described above.
If the water vapor transmission rate is less than 10 g/m ² ·day, the structure protection sheet 10 according to the present invention cannot sufficiently transmit water vapor, preventing swelling after being attached to a structure. Otherwise, the adhesion may become insufficient. If it exceeds 50 g/m ² ·day, the speed of water removal during hardening of the cement becomes excessively fast, and there is a possibility that the hardened cement will become porous. A preferable range of the water vapor transmission rate is 20 to 50 g/m ² ·day.
The structure protection sheet 10 according to the present invention having such a water vapor transmission rate can be obtained, for example, by using a polymer cement hardening layer 12 described later and a resin having a predetermined water vapor transmission rate for the resin layer 13. .
The water vapor transmission rate in the present invention can be measured by the method described below.

Moreover, the structure protection sheet according to the present invention may be used in a state in which two or more layers are stacked. Since the structure protected by the structure protection sheet according to the present invention can be further protected by stacking, for example, when two sheets of the structure protection sheet according to the present invention are attached side by side, these structures can be protected. Another structure protection sheet according to the present invention can be attached so as to cover the boundaries between the object protection sheets.
In the structure protection sheet 10 according to the present invention, the polymer cement hardened layer 12 contains cement and a resin component. 13 also exhibits suitable adhesion. Therefore, the structure protection sheet 10 according to the present invention can be suitably used in a stacked state.

The structure protection sheet 10 according to the present invention preferably has a thickness distribution within ±100 μm. Since the structure protection sheet 10 has a thickness distribution within the above range, even an unskilled worker can stably form a layer with small thickness variations on the surface of the structure. Further, by controlling the thickness distribution within the above range, it becomes easier to uniformly reinforce the structure.
The polymer cement hardened layer 12 provided on the structure side has excellent adhesion to the structure, etc., and the resin layer 13 provided on the polymer cement hardened layer 12 has waterproof, salt-blocking, and neutralization prevention properties. It is possible to easily impart excellent properties such as toughness.
In addition, since the structure protection sheet 10 according to the present invention can be mass-produced by the coating process and the drying process on the production line of the factory, it realizes cost reduction, a drastic reduction in work period at the site, and long-term protection of the structure. be able to.
In addition, since the structure protection sheet 10 according to the present invention is provided with the adhesive layer 15, it is not necessary to form an adhesive layer by applying an adhesive at the work site. It becomes easy to attach to the surface of the structure via an adhesive layer with an appropriate thickness. As a result, it is possible to greatly reduce the time required for attaching the film to the surface of the structure and to protect the structure for a long period of time.

Specific examples of each component are described in detail below.

(Structure)
The structure is a mating member to which the structure protection sheet 10 is applied.
As a structure, a structure made of concrete can be mentioned.
The concrete is generally obtained by placing and curing a cement composition containing at least a cementitious inorganic substance, an aggregate, an admixture and water. Such concrete is widely used as civil engineering structures such as road bridges, tunnels, water gates and other river management facilities, sewer pipes, harbor quays and the like. In the present invention, by applying the structure protection sheet 10 to a structure made of concrete, it is possible to follow the cracks and expansion that occur in the concrete, and prevent deterioration factors such as water and chloride ions from penetrating into the concrete. There is a special advantage that the moisture inside can be discharged as steam.

In the present invention, it is preferable that the structure has a plurality of parallel linear steps formed on its surface.
As a structure having such a surface, for example, as shown in FIG. 2c, which has a surface in which flat portions and steps are repeatedly formed. The structure having such a surface is not particularly limited, but suitable examples thereof include a slate roof, a Galvalume steel plate (registered trademark), a tiled roof (ridge/flat), and the like.

(polymer cement hardened layer)
The polymer cement hardening layer 12 is a layer arranged on the structure side. The hardened polymer cement layer 12 may be a single layer as shown in FIG. 1(A) or a laminate as shown in FIG. 1(B). The thickness is arbitrarily set in consideration of the overall thickness, imparted functions (followability, adhesion to structures, etc.), factory production line, production cost, etc. For example, if the production line is short and a single layer If it does not become thick, it can be formed by coating two or more layers. For example, when two layers are overcoated, the second layer is formed after drying the first layer.
The hardened polymer cement layer 12 may also have a structure in which layers having different properties are layered together. For example, by forming a layer with a higher resin component ratio on the resin layer 13 side, the layer with a high resin component adheres to the resin layer, and the layer with a high cement component adheres to the concrete structure. It has excellent properties.

The hardened polymer cement layer 12 is obtained by coating a resin containing a cement component (resin component) in the form of a coating.
Examples of the cement component include various cements, limestones containing calcium oxide, and clays containing silicon dioxide. Among them, cement is preferable, and examples thereof include portland cement, alumina cement, high-early strength cement, fly ash cement, and the like. Which cement is selected is selected according to the properties that the polymer-cement-hardened layer 12 should have, for example, considering the degree of conformability to a concrete structure. Portland cement defined in JIS R5210 is particularly preferred.

Examples of the resin component include acrylic resin, acrylic urethane resin, acrylic silicone resin, fluororesin, flexible epoxy resin, polybutadiene rubber, acrylic resin exhibiting rubber properties (e.g., synthetic rubber containing acrylic acid ester as a main component), etc. can be mentioned. Such a resin component is preferably the same as the resin component constituting the resin layer 13 described later, from the viewpoint of enhancing the adhesion between the polymer cement hardening layer 12 and the resin layer 13 .
Moreover, any of a thermoplastic resin, a thermosetting resin, and a photocurable resin may be used as the resin component. The term "cured" in the polymer cement cured layer 12 does not mean that the resin component is limited to resins that cure and polymerize, such as thermosetting resins or photocurable resins. It is used in the sense that it is sufficient to use a material that hardens to a certain degree.

The content of the resin component is adjusted appropriately according to the material used, etc., but is preferably 10% by weight or more and 40% by weight or less with respect to the total amount of the cement component and the resin component. If it is less than 10% by weight, the adhesion to the resin layer 13 tends to decrease and it becomes difficult to maintain the polymer cement hardened layer 12 as a layer. may be insufficient. From the above viewpoint, the content of the resin component is more preferably 15% by weight or more and 35% by weight or less, and more preferably 20% by weight or more and 30% by weight or less.

The coating material for forming the polymer cement hardening layer 12 is a coating liquid obtained by mixing a cement component and a resin component with a solvent. The resin component is preferably an emulsion. For example, an acrylic emulsion is polymer fine particles obtained by emulsion polymerization of a monomer such as an acrylic ester using an emulsifier. An acrylic polymer emulsion obtained by polymerizing a mixture in water containing a surfactant is preferably used.
The content of the acrylic acid ester and the like constituting the acrylic emulsion is not particularly limited, but is selected within the range of 20 to 100% by mass. Further, the amount of the surfactant is also blended according to need, and the amount is not particularly limited, but the surfactant is blended to the extent that it forms an emulsion.

The hardened polymer cement layer 12 is formed by applying the coating solution onto a release sheet and then removing the solvent (preferably water) by drying. For example, a mixed composition of a cement component and an acrylic emulsion is used as a coating liquid to form the polymer cement hardened layer 12 . Although the resin layer 13 may be formed on the release sheet after forming the polymer cement hardened layer 12, the polymer cement hardened layer 12 may be formed after the resin layer 13 is formed on the release sheet. may
Specifically, for example, a process paper as a release sheet is coated with a resin layer, and after drying, a coating liquid for polymer cement is applied, and a Young's modulus adjusting layer is attached in a wet state before drying. dry.
After that, a coating liquid for polymer cement is further applied to the surface to which the Young's modulus adjusting layer is attached, and dried to obtain a structure protection sheet in which the Young's modulus adjusting layer is present in the polymer cement hardened layer according to the present invention. Obtainable.
In addition, a step of coating a resin layer on a process paper as a release sheet, applying a coating liquid for polymer cement after drying, laminating a Young's modulus adjusting layer in a wet state before drying, and then drying. A structure protection sheet in which a Young's modulus adjusting layer is present in the polymer cement hardened layer by further coating the surface to which the Young's modulus adjusting layer is attached without drying, and then drying the entire surface. It is also possible to obtain

The thickness of the polymer cement hardened layer 12 is not particularly limited, and is arbitrarily set depending on the usage pattern, aging degree, shape, etc. of the structure. A specific thickness of the hardened polymer cement layer 12 can be, for example, in the range of 0.5 mm to 1.5 mm. As an example, when the thickness is 1 mm, the thickness variation is preferably within ±100 μm. Such a precise thickness cannot be achieved by on-site coating, but can be achieved by stably coating on a factory production line. Even if the thickness is greater than 1 mm, the thickness variation can be kept within ±100 μm. Moreover, when the thickness is less than 1 mm, the thickness variation can be further reduced.

Due to the presence of the cement component, the hardened polymer cement layer 12 is more easily permeable to water vapor than the resin layer 13, which will be described later. The water vapor transmission rate at this time is, for example, about 20 to 60 g/m ² ·day. Furthermore, the cement component has good compatibility with, for example, the cement component that constitutes concrete, and can be made to have excellent adhesion to the concrete surface. Also, the structure protection sheet 10 has an adhesive layer, and the polymer cement hardened layer 12 containing a cement component adheres to the adhesive layer with good adhesion. In addition, since the polymer cement hardened layer 12 has extensibility, it can follow changes in the concrete even if cracks or expansion occurs in the structure.

(mesh layer)
Preferably, the present invention further comprises a mesh layer.
Since the structure protection sheet according to the present invention further includes a mesh layer, the structure protection sheet according to the present invention can have sufficient strength.

As shown in FIG. 5(A), the structure protection sheet 10 according to the present invention has excellent adhesion strength, and thus the mesh layer 17 is provided at the interface between the hardened polymer cement layer 12 and the resin layer 13. is preferred.
The adhesion strength is determined by attaching the polymer cement hardening layer 12 side surface of the structure protection sheet 10 according to the present invention to the concrete surface via the adhesive layer 15 and fixing a tension jig to the surface of the resin layer 13. It is obtained by measuring the strength at which tensile delamination occurs by pulling the tensile jig to the side opposite to the concrete side at a speed of 1500 n/min.

Moreover, the mesh layer 17 may exist inside the polymer cement hardened layer 12 as shown in FIG. 5(B). The mesh layer 17 may be disposed on the surface of the polymer cement hardened layer 12 opposite to the surface in contact with the resin layer 13 , but the mesh layer 17 may be embedded inside the polymer cement hardened layer 12 . preferable. By embedding the mesh layer 17 inside the polymer cement hardened layer 12, the contact area between the mesh layer 17 and the polymer cement hardened layer 12 is increased, and the adhesion strength between the two is easily improved, and the polymer cement It becomes easy to ensure the strength of the hardened layer 12 as a whole. If the mesh layer 17 is not embedded inside the polymer cement-hardened layer 12, separation is likely to occur at the interface between the mesh layer 17 and the polymer cement-hardened layer 12.
Moreover, when the mesh layer 17 exists inside the polymer cement hardened layer 12, the mesh layer 17 may exist at a position half the thickness of the polymer cement hardened layer 12, but the resin layer 13 It is desirable to be on the side. When the mesh layer 17 exists on the resin layer 13 side in the polymer cement hardened layer 12, the adhesive strength is improved by 1.3 times on average.

In the present invention, it is preferable that the mesh layer 17 is impregnated with a material (for example, a cement component or a resin component) that constitutes the polymer cement-hardened layer 12 .
The state in which the mesh layer 17 is impregnated with the material constituting the hardened polymer cement layer 12 means that the material constituting the hardened polymer cement layer 12 is filled between the fibers constituting the mesh layer 17. In other words, such an impregnated state makes it easier to make the adhesive strength between the mesh layer 17 and the polymer cement hardened layer 12 extremely excellent. Further, the interaction between the mesh layer 17 and the material of the polymer cement hardening layer 12 tends to become stronger, and the strength of the structure protection sheet 10 tends to be improved.

As shown in FIG. 6, the mesh layer 17 has a structure in which warp and weft fibers are arranged in a grid pattern.
The above fibers are composed of, for example, at least one fiber selected from the group consisting of polypropylene fibers, vinylon fibers, carbon fibers, aramid fibers, glass fibers, polyester fibers, polyethylene fibers, nylon fibers and acrylic fibers. Among them, polypropylene fibers and vinylon fibers can be preferably used.
Further, the shape thereof is not particularly limited, and any mesh layer 17 such as a triaxial fabric can be used in addition to the biaxial fabric as shown in FIG.

The mesh layer 17 preferably has a line pitch of 50 mm to 1.2 mm (line density of 0.2 to 8.0 lines/cm). If the pitch is 1.2 mm or less, the bonding between the polymer cement layers above and below the mesh may be insufficient, and the surface strength of the structure protection sheet 10 may be insufficient. Also, if the line pitch exceeds 50 mm, the surface strength of the structure protection sheet 10 is not adversely affected, but the tensile strength may be weakened.
In the structure protection sheet 10 according to the present invention, there is a trade-off relationship between tensile strength and surface strength, and the mesh layer 17 suitable for application to the present invention has a line pitch in the range of 50 mm to 1.2 mm. be.

The mesh layer 17 may have a size that covers the entire surface of the polymer cement-hardened layer 12 when viewed from the top side of the polymer cement-hardened layer 12 , or may be smaller than the polymer cement-hardened layer 12 .
That is, the area of the mesh layer 17 when viewed in plan may be the same as or smaller than the area of the polymer cement hardening layer 12 when viewed in plan. It is preferably 60% or more and 95% or less of the plan view area of the cement-hardened layer 12 . If it is less than 60%, the strength of the structure protection sheet 10 according to the present invention may be insufficient, and the strength may vary. If it exceeds 95%, in the structure in which the polymer cement-hardened layers 12 are laminated via the mesh layer 17, the adhesive strength between the polymer-cement hardened layers 12 may be inferior, and the structure protection sheet 10 according to the present invention may not be structured. When applied to an object, the risk of delamination at the polymer cement hardened layer 12 increases. The planar view area of the mesh layer 17 and the like can be measured by a known method.

(resin layer)
The resin layer 13 is a layer arranged on the side opposite to the structure 1 and appearing on the surface. The resin layer 13 may be, for example, a single layer as shown in FIG. 1(A), or may be a laminate of at least two layers as shown in FIG. 1(B). Whether to use a single layer or multiple layers takes into account the overall thickness, the functions to be imparted (waterproofness, salt barrier, neutralization prevention, water vapor permeability, etc.), the length of the factory production line, the production cost, etc. For example, if the production line is short and a single layer does not have a predetermined thickness, two or more layers can be overcoated. In the case of overcoating, the second layer is applied after drying the first layer. The second layer is then dried.

The resin layer 13 is coated with a paint that has flexibility, can follow cracks and cracks that occur in concrete, and can form a resin layer that is excellent in waterproofness, salt resistance, neutralization resistance, and water vapor permeability. obtained by Resins constituting the resin layer 13 include acrylic resins exhibiting rubber characteristics (for example, synthetic rubber containing acrylic acid ester as a main component), acrylic urethane resins, acrylic silicone resins, fluorine resins, flexible epoxy resins, polybutadiene rubbers, and the like. can be mentioned. This resin material is preferably the same as the resin component constituting the polymer cement hardening layer 12 described above. In particular, it is preferably a resin containing an elastic film-forming component such as rubber.

　Among these, acrylic resins exhibiting rubber properties are preferably composed of aqueous emulsions of acrylic rubber copolymers in terms of excellent safety and coatability. Incidentally, the proportion of the acrylic rubber copolymer in the emulsion is, for example, 30 to 70% by mass. An acrylic rubber copolymer emulsion is obtained, for example, by emulsion polymerization of monomers in the presence of a surfactant. Any of anionic, nonionic and cationic surfactants can be used.

The paint for forming the resin layer 13 is prepared by preparing a mixed coating liquid of a resin composition and a solvent, applying the coating liquid on a release sheet, and then removing the solvent by drying. A layer 13 is formed. The solvent may be water, an aqueous solvent, or an organic solvent such as xylene/mineral spirit. In Examples described later, a water-based solvent is used, and the resin layer 13 is made of an acrylic rubber composition. The order of the layers formed on the release sheet is not limited. may be in that order.

The thickness of the resin layer 13 is arbitrarily set depending on the type of usage, degree of aging, shape, etc. of the structure 1. As an example, it is preferable that the thickness be within the range of 50 to 150 μm, and that the thickness variation be within ±50 μm. Thickness with such precision cannot be achieved by coating on site, and can be stably achieved on the production line of the factory.

This resin layer 13 has high waterproof properties, salt-shielding properties, and neutralization-preventing properties, but is preferably permeable to water vapor. At this time, the water vapor transmission rate is preferably about 10 to 50 g/m ² ·day, for example. By doing so, the structure protection sheet 10 can have high waterproof properties, salt barrier properties, neutralization prevention properties, and predetermined water vapor permeability. Furthermore, by being composed of the same kind of resin component as the polymer cement hardening layer 12, the compatibility with the polymer cement hardening layer 12 is good and the adhesion can be excellent. The water vapor permeability was measured according to JIS Z0208 "Test method for moisture permeability of moisture-proof packaging materials".

Moreover, the resin layer 13 may contain a pigment from the viewpoint of increasing the color variation of the structure protection sheet 10 .
Moreover, the resin layer 13 may contain an inorganic substance. By containing the inorganic substance, the resin layer 13 can be provided with scratch resistance. The inorganic material is not particularly limited, and examples thereof include conventionally known materials such as metal oxide particles such as silica, alumina, and titania.
Furthermore, the resin layer 13 may contain a known antifouling agent. Since the structure protection sheet 10 is usually used for repairing concrete structures installed outdoors, the resin layer 13 is often contaminated. can be suitably prevented. The antifouling agent is not particularly limited and includes conventionally known materials.
Moreover, the resin layer 13 may contain an additive capable of imparting various functions. Examples of such additives include cellulose nanofibers and the like.

(adhesion layer)
In the present invention, the structure protection sheet 10 is provided with an adhesive layer 15 on the side of the polymer cement hardened layer 12 opposite to the resin layer 13 (the side facing the structure 1).
Since the adhesive layer 15 is provided on the surface of the polymer cement hardening layer 12, when the structure protection sheet 10 is attached to the structure, it is not necessary to apply an adhesive to form an adhesive layer at the work site. Since there is no adhesive layer, the work efficiency is extremely high, and the structure protection sheet 10 can be attached to the structure via the adhesive layer 15 having a uniform thickness without relying on a skilled craftsman. In addition, since the adhesive layer 15 is provided, the adhesive layer 15 can be aligned with linear steps formed on the surface of the structure, thereby enhancing the adhesion of the structure protection sheet 10 .

The adhesive layer 15 may be an adhesive layer using an adhesive, or may be an adhesive layer using an adhesive. Considering the pot life of the adhesive layer 15, the adhesive layer is preferable.
The adhesive is not particularly limited, and examples thereof include known adhesives such as acrylic adhesives, silicone adhesives, urethane adhesives, and rubber adhesives. In the present invention, the adhesive layer 15 is an acrylic adhesive. It is preferable to contain an adhesive as a main component. The acrylic pressure-sensitive adhesive has a high degree of freedom in material design because it is easy to adjust the adhesive force to the structure, and is excellent in transparency, weather resistance, and heat resistance. Protection can be done better.
The acrylic pressure-sensitive adhesive is not particularly limited, and a commercial product can be used.

The amount of the adhesive layer 15 (hereinafter also referred to as the adhesive layer) containing the acrylic adhesive as a main component is 20 g/m ² because it can exhibit sufficient adhesion to the surface of a structure such as concrete. More than 250 g/m ² or less is preferable.
Further, it is preferable that the adhesive layer has an adhesive force of 0.5 N/mm ² or more when attached to the surface of the structure via the adhesive layer. If it is less than 0.5 N/mm ² , the adhesion of the structure protection sheet 10 to the structure surface may be insufficient.

When the adhesive layer 15 in the structure protection sheet 10 is an adhesive layer composed of an adhesive, the adhesive is not particularly limited, and known adhesives such as ultraviolet curable adhesives and heat curable adhesives can be mentioned. be done.
Such adhesives include, for example, urethane-based adhesives, epoxy-based adhesives, and adhesives using acrylic resins exhibiting rubber characteristics (for example, synthetic rubbers containing acrylic acid ester as a main component). Among them, an adhesive composed of the same kind of resin component as that constituting the polymer cement hardened layer 12 of the structure protection sheet 10 is more preferable because the adhesive strength with the polymer cement hardened layer 12 is increased.

In the structure protection sheet 10, the adhesive layer 15 preferably contains a curing agent. By including the curing agent, the structure-protecting sheet 10 has excellent adhesion to structures, and the structure-protecting sheet 10 also has excellent punching strength.
The structure protection sheet 10 preferably has a punch strength of 1.5 kN or more in a punch test specified in JSCE-K-533. When the punch strength is 1.5 kN or more, the structure protection sheet 10 can suitably prevent the problem of concrete or the like falling off the surface of the structure.

The curing agent is not particularly limited, and known curing agents such as isocyanate curing agents, amine curing agents, epoxy curing agents, and metal chelate curing agents can be used.

In the structure protection sheet 10, the adhesive layer 15 preferably has a gel fraction of 30% to 70%, since the adhesion to the structure and the punching strength of the structure protection sheet 10 are excellent, and the lower limit is more preferable. 40%, and a more preferable upper limit is 65%.

In the structure protection sheet 10, the adhesive layer 15 preferably has a thickness of 50 to 500 µm. If the thickness is less than 50 μm, the adhesion of the structure protection sheet 10 to the structure may be insufficient, and if it exceeds 500 μm, the thickness tends to vary. Excess adhesive may protrude from the end when it is flattened. A more preferable lower limit of the thickness of the adhesive layer 15 is 90 μm, and a more preferable upper limit thereof is 200 μm.

(release sheet)
In order to protect the surface of the adhesive layer 15 , the structure protection sheet 10 has a release sheet 16 attached to the side of the adhesive layer 15 opposite to the polymer cement hardened layer 12 . Such a release sheet 16 is peeled off when it is attached to the surface of the structure 21 as shown in FIG. 2(A). Then, as shown in FIG. 2B, after exposing the adhesive layer, the structure protection sheet 10 is attached to the surface of the structure 21 from the adhesive layer side.
Such a release sheet 16 is not particularly limited, and examples thereof include a sheet having a base material layer and a release layer.
Examples of materials constituting the base material layer include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyolefins such as polyethylene, polypropylene and polymethylpentene, polyamides such as nylon 6, vinyl resins such as polyvinyl chloride, polymethyl Examples include acrylic resins such as methacrylate, cellulose resins such as cellulose acetate, and synthetic resins such as polycarbonate. Moreover, the said base material layer may be formed considering paper as a main component. Furthermore, the base material layer may be a laminate of two or more layers.

Examples of materials that constitute the release layer include silicone resins, melamine resins, and fluorinated polymers. The release layer is formed by a known method such as a gravure coating method, a roll coating method, a comma coating method, a lip coating method, or the like, by applying a coating liquid containing a material constituting the release layer and an organic solvent onto the base material layer. It can be formed by a coating method of coating, drying and curing. In addition, in forming the release layer, the lamination surface of the base material layer may be subjected to corona treatment or adhesion facilitating treatment.

In the present invention, the release sheet 16 is formed with one or more slits.
Even if the structure protection sheet according to the present invention is wide, it can be attached to the surface of the structure by peeling off only the release sheet corresponding to the part to be attached, so that wrinkles and air bubbles are generated. The occurrence of biting can be suitably prevented. In addition, even on the surface of a structure with steps, it is possible to apply the structure protection sheet efficiently without wrinkles and gaps by peeling off only the release sheet on the part to be pasted and exposing the adhesive layer. becomes.

In the present invention, a plurality of linear steps are formed in parallel on the surface of the structure, and the slits formed in the release sheet are formed at locations facing the corners formed by the steps. preferably.
The "corner formed by a step" is a corner formed by a flat portion on the surface of the structure and a step adjacent to the flat portion. A corner (convex corner) formed with the first flat portion 2a arranged at a high position with respect to the first step 3a, or formed with a second flat portion 2b arranged at a low position with respect to the first step 3a. Corners (concave corners) can be mentioned.
The slits are corners formed by steps on the surface of the structure (convex corners and/or It is preferably formed in a portion facing the concave corner).

The release sheet 16 formed with the slits is divided into a plurality of regions by the formed slits. Specifically, for example, as shown in FIG. , corners (concave corners) formed with the second flat portion 2b disposed at a low position with respect to the first step 3a, and slits are provided at locations facing all of the convex corners and the concave corners. When it is formed, as shown in FIG. 3, regions (1) to (4) are divided into slits in order from one long side.
The region (1) is, as shown in FIG. By peeling off, the structure protection sheet 10 can be attached only to the first flat portion 2a. Similarly, region (2) is the release sheet 16 facing the first step 3a, region (3) the second flat portion 2b, and region (4) the second step 3b.
Steps and flat portions are further formed on the surface of the structure 1 shown in FIG. And the structure protection sheet 10 can be attached efficiently without forming a gap. In addition, when repeating the pasting method described above, it is preferable that the structure protection sheet to be pasted later is pasted in a state in which it partially overlaps the previously pasted structure protection sheet. This is because it is possible to prevent a gap from being formed between the structure protection sheets.
When a structure protection sheet is attached to the first step 3a and the first flat portion 2a, for example, as shown in FIG. A slit is provided at a location facing the corner (convex corner) formed by the first flat portion 2a and the first step 3a, and the release sheet 16 in the region (1) is peeled off to form the first flat portion The structure protection sheet 10 can be attached only to the first step 3a by attaching the structure protection sheet 10 only to 2a and then peeling off the release sheet 16 in the area (2).
Further, for example, when a slit is formed only at a position facing either the convex corner portion or the concave corner portion, the structure protection sheet may be folded when attached to the structure. It is divided into a plurality of regions by the bent portion and the bent portion. Specifically, for example, when the slits are formed on the surface of the structure at locations facing the convex corners, as shown in FIG. The mold sheet 16 is peeled off, and the structure protection sheet 10 is attached only to the first flat portion 2a. The structure protection sheet 10 can be attached to the second flat end portion 2b by forming a bent portion at the corner formed by the first stepped portion 3a and the second flat portion 2b while attaching the object protection sheet 10 to the second flat portion 2b. Similarly, area (4) is release sheet 16 facing second step 3b. In FIG. 8(b), the solid line indicates the slit at the location facing the convex corner, and the broken line indicates the bent portion formed at the location facing the concave corner. It is also possible to form a bent portion at the edge and form a slit at a portion opposite to the concave corner portion.
Steps and flat portions are further formed on the surface of the structure 1 shown in FIG. And the structure protection sheet 10 can be attached efficiently without forming a gap. In addition, when repeating the pasting method described above, it is preferable that the structure protection sheet to be pasted later is pasted in a state in which it partially overlaps the previously pasted structure protection sheet. This is because it is possible to prevent a gap from being formed between the structure protection sheets.

The construction method of the structure protection sheet according to the present invention is also one aspect of the present invention.
That is, in the construction method of the structure protection sheet according to the present invention, a plurality of linear steps are formed in parallel on the surface of the structure, and the slits formed in the release sheet are formed by the steps. a step of disposing the structure protection sheet on the surface of the structure so that the corners of the structure and the slits of the release sheet face each other; exposing the adhesive layer by peeling the release sheet from the slit facing the part to one end; and attaching the exposed adhesive layer to the surface of the structure. Characterized by

As described with reference to FIGS. 3, 4 and 8, the construction method of the structure protection sheet according to the present invention is such that the structure protection sheet 10 according to the present invention has predetermined slits formed in the release sheet. Therefore, when attaching to the surface of a structure, it is possible to peel off only the necessary part of the release sheet to expose the adhesive layer and attach it to the surface of the structure, forming multiple linear steps in parallel. It can be suitably pasted on the surface of the structure with no gaps or wrinkles.
In addition, the moisture in the structure such as concrete can be discharged, and the concrete structure 1 can be protected for a long period of time. In particular, the structure protection sheet 10 is given performance according to the characteristics of the structure 1 to follow cracks and expansions that occur in the structure 1, and permeation of deterioration factors such as water and chloride ions into the structure 1. In addition, the structure 1 can be made permeable so that deterioration factors in the structure 1 can be discharged.
Since such a structure protection sheet 10 can be manufactured in a factory, it is possible to mass-produce high-quality sheets with stable characteristics. As a result, it can be constructed without relying on the skills of craftsmen, shortening the construction period and reducing labor costs.

In the construction method of the structure protection sheet according to the present invention, a primer layer containing a curable resin material may be formed on the surface of the structure.
The curable resin material is not particularly limited as long as it is a material that can be cured by heat curing, photocuring or other methods to become a resin, but epoxy compounds are preferred. In this case, the cured primer layer formed by curing the primer layer is a cured epoxy material. An epoxy cured product is generally obtained by curing an epoxy compound having two or more epoxy groups with a curing agent. An example in which a cured epoxy material is used as a primer layer will be described below.

Examples of the epoxy compounds include bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, ortho-cresol novolac type epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, and diglycidyl ethers of phenols. , diglycidyl ethers of alcohols, and the like.
Curing agents include polyfunctional phenols, amines, polyamines, mercaptans, imidazoles, acid anhydrides, phosphorus-containing compounds, and the like. Among these, polyfunctional phenols include monocyclic and bifunctional phenols such as hydroquinone, resorcinol, and catechol, polycyclic and bifunctional phenols such as bisphenol A, bisphenol F, naphthalene diols, biphenols, and halides thereof. , alkyl group-substituted products, and the like. Furthermore, novolacs and resoles, which are polycondensates of these phenols and aldehydes, can be used. Amines include aliphatic or aromatic primary amines, secondary amines, tertiary amines, quaternary ammonium salts and aliphatic cyclic amines, guanidines, urea derivatives and the like.
Among the above examples, materials for the primer layer (including curable resin materials) include epoxy resin primers such as bisphenol A type epoxy or bisphenol F type epoxy as a main agent and polyamines or mercaptans as a curing agent. and the like. Further, the epoxy resin-based primer may contain, for example, a coupling agent, a viscosity modifier, a curing accelerator, etc., in addition to the main agent and the curing agent. As such a primer layer, for example, Toagosei Co., Ltd.'s two-liquid reaction-curing water-based epoxy resin emulsion "Aron Bull Coat P-300" (trade name, "Aron Blue Coat" is a registered trademark of Toagosei Co., Ltd.). ) can be used.

The primer layer is generally used as a primer for construction. For the coating, for example, a solvent-type epoxy resin solvent solution, an epoxy resin emulsion and other general emulsions, or a pressure-sensitive adhesive may be applied to the surface of the structure as the undercoat material. In this case, the undercoat material can be applied by a normal method, for example, by applying it to the surface of the structure to be prevented from deterioration with a brush or roller, or by spraying with a spray gun or the like. to form a coating film.
Although the thickness of the primer layer is not particularly limited, it is preferably in the range of 50 μm or more and 300 μm or less in a wet state. By setting the thickness to 50 μm or more, it becomes easier to make the thickness of the primer layer uniform considering the penetration of the material of the primer layer into the structure such as concrete, and the adhesion between the structure and the structure protection sheet is ensured. easier to do. Although the upper limit of the thickness of the primer layer is not particularly limited, it is preferably 300 μm or less from the viewpoint of ease of application, minimization of displacement between both layers during adhesion, and optimization of material usage. The primer layer provided as the undercoat layer of the structure acts to enhance the mutual adhesion between the structure and the structure protection sheet, so if the primer layer has the above thickness, the structure protection sheet will be stable for a long period of time. Helps strengthen and protect structures.
If the structure has cracks or defects, it is preferable to provide the primer layer after repairing the cracks or defects before applying the primer layer. The repair method is not particularly limited, but cement mortar, epoxy resin, or the like is usually used for repair.

The present invention will be explained more specifically with examples and comparative examples.

(Example 1)
A resin layer-forming composition containing an acrylic resin was applied onto a 130 μm thick release sheet 16 made of PP laminated paper and dried to form a 100 μm thick single layer resin layer 13 . After that, a composition for forming a hardened polymer cement layer was applied on the resin layer 13 and dried to form a hardened polymer cement layer 12 having a thickness of 1.00 mm consisting of a single layer.
On the surface of the polymer cement hardened layer 12, 100 parts by mass of an acrylic adhesive (Olivine (registered trademark) 6574 (manufactured by Toyochem)) and 6 parts by mass of an isocyanate hardening agent (BHS8515 (manufactured by Toyochem)) are mixed. , to prepare a pressure-sensitive adhesive mixture having a gel fraction of 57%. This pressure-sensitive adhesive mixture was applied to the surface of the resin layer 13 and dried to form an adhesive layer 15 (adhesive layer) having a thickness of 200 μm, thereby manufacturing a structure protection sheet 10 having a total thickness of 1300 μm.
This structure protection sheet 10 was continuously produced in a factory controlled at about 25° C., and was wound into a roll including a PP laminated paper release sheet to form the structure shown in FIG.
Further, as shown in FIG. 8A, the release sheet 16 is provided with a slit in advance at a position of 185 mm from one long side to form a region (1), and from the slit to the other long side 15 mm was defined as the region (2).

The composition for forming a polymer cement hardened layer is a water-based acrylic emulsion containing 45 parts by mass of a cement mixture. The cement mixture contains at least 70 ± 5 parts by mass of Portland cement, 10 ± 5 parts by mass of silicon dioxide, 2 ± 1 parts by mass of aluminum oxide, and 1 to 2 parts by mass of titanium oxide. The acrylic emulsion contains acrylic acid ester monomers. contains at least 53±2 parts by mass of an acrylic polymer obtained by emulsion polymerization using an emulsifier and 43±2 parts by mass of water. The polymer cement hardened layer obtained by coating and drying the composition for forming the polymer cement hardened layer in which these are mixed is a composite layer containing 50% by mass of Portland cement in the acrylic resin. On the other hand, the resin layer-forming composition is an acrylic silicone resin. This acrylic silicone resin is an emulsion composition containing 60 parts by mass of acrylic silicone resin, 25 parts by mass of titanium dioxide, 10 parts by mass of ferric oxide, and 5 parts by mass of carbon black.

[Construction on the surface of structures]
The structure protection sheet according to Example 1 was adhered to the slate roof in the lateral direction (direction parallel to the step) from the adhesive layer side.
Specifically, first, the first flat portion at the top of the slate roof faces the region (1) of the structure protection sheet, and the adhesive layer exposed while peeling the release sheet of the region (1) is applied. Affixed to the first flat portion.
Next, the exposed adhesive layer was attached to the first step while peeling off the release sheet in the region (2).
As a result, a structure protection sheet having a uniform surface without wrinkles or gaps formed between the flat portion and the steps of the slate roof could be efficiently applied.

(Example 2)
A structure protection sheet 10 having the same layer structure as in Example 1 was produced.
This structure protection sheet 10 was continuously produced in a factory controlled at about 25° C., and was wound into a roll including a PP laminated paper release sheet to form the structure shown in FIG.
Further, as shown in FIG. 8B, the release sheet 16 is previously provided with a first slit at a position 185 mm from one long side to form a region (1). A bent portion is provided at a position of 15 mm on the other long side to form a region (2), and a second slit is provided at a position of 185 mm from the bent portion on the other long side to form a region (3). A region (4) was defined as 15 mm from the second slit to the other long side.

[Construction on the surface of structures]
The structure protection sheet according to Example 2 was adhered to the slate roof in the lateral direction (direction parallel to the step) from the adhesive layer side.
Specifically, first, the first flat portion at the top of the slate roof faces the region (1) of the structure protection sheet, and the adhesive layer exposed while peeling the release sheet of the region (1) is applied. Affixed to the first flat portion.
Next, the adhesive layer exposed while peeling off the release sheet of the region (2) and the region (3) is attached to the first step and the second flat portion, and while peeling the release sheet of the region (4) The exposed adhesive layer was attached to the second step.
As a result, a structure protection sheet having a uniform surface without wrinkles or gaps formed between the flat portion and the steps of the slate roof could be efficiently applied.

(Example 3)
A structure protection sheet 10 having the same layer structure as in Example 1 was produced.
The release sheet 16 was previously provided with a first slit at a position of 180 mm from one long side to form a region (1), and a second slit was provided at a position of 15 mm from the first slit to form a region (1). (2) is formed, a third slit is provided at a position 180 mm from the second slit to form region (3), and a fourth slit is provided at a position 15 mm from the third slit to form region (4 ) to form regions (1) to (4) divided by slits. The regions (1) to (4) were formed so as to face the flat portions and the steps to be attached to the slate roof structure.
After that, the first flat portion of the top of the slate roof is made to face the region (1) of the structure protection sheet, and the adhesive layer exposed while peeling the release sheet of the region (1) is applied to the first flat portion. pasted.
Next, the exposed adhesive layer was attached to the first step by peeling off the release sheet in the region (2) facing the first step adjacent to the first flat portion.
Next, the exposed adhesive layer was attached to the second flat portion while peeling off the release sheet in the region (3) facing the second flat portion adjacent to the first step.
Next, the exposed adhesive layer was attached to the second step while peeling off the release sheet in the region (4) facing the second step adjacent to the second flat portion.
As a result, a structure protection sheet having a uniform surface without wrinkles or gaps formed between the flat portion and the steps of the slate roof could be efficiently applied.

(Example 4)
Mix 3 parts by mass of an isocyanate curing agent (BHS8515 (manufactured by Toyochem Co., Ltd.)) with 100 parts by mass of an acrylic adhesive (Oribain (registered trademark) 6574 (manufactured by Toyochem Co., Ltd.)) to give an adhesive with a gel fraction of 46%. A structure protection sheet was produced in the same manner as in Example 3, except that the mixed solution for agents was used.
After that, when the surface of the structure was applied in the same manner as in Example 3, the structure protection sheet was efficiently applied with a uniform surface without wrinkles or gaps between the flat part and the step of the slate roof. did it.

(Comparative example 1)
A structure protection sheet was produced in the same manner as in Example 3, except that no slits were formed in the release sheet.
After that, when construction was performed on the same slate roof as in Example 3 while peeling off the release sheet, the flat part and the step could not be attached at the same time, and the construction efficiency was poor. The protective sheet had wrinkles and gaps.

1, 21 structure 2a first flat part 2b second flat part 2c third flat part 3a first step 3b second step 10 structure protection sheet 12 polymer cement hardened layer 13 resin layer 15 adhesive layer 16 release sheet 17 mesh layer 30 roof 31 blue sheet 32 sandbag

Claims (9)

1. A structure protection sheet provided with a release sheet, an adhesive layer, a polymer cement hardened layer and a resin layer in this order and used by bonding to the surface of a structure,
   A structure protection sheet, wherein one or more slits are formed in the release sheet.
2. The structure protection sheet according to claim 1, wherein the slits of the release sheet are formed in the longitudinal direction.
3. Multiple linear steps are formed in parallel on the surface of the structure,
   3. The structure protection sheet according to claim 1, wherein the slits formed in the release sheet are formed at locations facing the corners formed by the steps.
4. The structure protection sheet according to claim 1 or 2, further comprising a mesh layer.
5. The structure protection sheet according to claim 1 or 2, wherein the adhesive layer contains an acrylic pressure-sensitive adhesive as a main component.
6. 3. The structure protective sheet according to claim 1 or 2, which has an adhesive strength of 0.5 N/mm< ^{2 >} or more when attached to the surface of a structure via an adhesive layer.
7. The structure protection sheet according to claim 1 or 2, wherein the adhesive layer has a thickness of 50 to 500 µm.
8. The structure protection sheet according to claim 1 or 2, wherein the polymer cement hardening layer is a layer containing a cement component and a resin, and the resin is contained in an amount of 10% by weight or more and 40% by weight or less.
9. A construction method for the structure protection sheet according to claim 3,
   disposing the structure protection sheet on the surface of the structure so that the corners of the structure and the slits of the release sheet face each other;
   exposing the adhesive layer by peeling the release sheet from the slit facing the corner of the structure to one end;
   and attaching the exposed adhesive layer to the surface of the structure.
   
   
   

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