JP2005013990A - Waterproofing structure and waterproofing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproofing structure and a waterproofing method wherein a waterproofing layer, having a designed appearance and/or a slip-resistive rough surface, can be executed in a short time. <P>SOLUTION: A one-part wet-curing type of urethane resin composition is cured on a surface of a substrate 1 to be waterproofed to form a high-weathering polyurethane waterproofing layer 2. At least one of foil chips and particulate matters are adhered to this polyurethane waterproofing layer in a dispersed state to form the waterproofing structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a highly weather-resistant polyurethane waterproof layer in which at least one of a granular material imparting a slip-resistant rough surface and a foil-like chip imparting a design appearance is fixed in a dispersed state on the surface of a waterproof substrate. The present invention relates to a waterproof structure and a waterproof construction method.

  Conventionally, a waterproofing method in which a polyurethane waterproof layer is formed on the surface of a waterproof base is used. In this conventional method, a primer layer made of a synthetic resin is formed on the surface of the substrate, a polyurethane waterproof layer is formed on the primer layer, and a top coat layer for improving weather resistance is further formed on the polyurethane waterproof layer. Was. However, in this conventional method, the primer layer is applied and dried, and then a polyurethane waterproof layer is formed. Further, the polyurethane waterproof layer forms a topcoat layer after curing, and thus there is a problem that it takes time for construction. .

  In addition, as a waterproof material having good weather resistance and capable of shortening the work period by omitting the top coat layer at the time of construction, two types of hindered amine stabilizers in the urethane resin composition, A. Poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl} {(2,2,6,6-tetramethyl-4-piperidyl ) Imino} hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino}] and B. A urethane resin composition characterized by containing bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate has been proposed (for example, see Patent Document 1).

  In addition, in this type of waterproof structure, coloring is often applied to give a design appearance to the surface, and in recent years, a high-quality coloring including a plurality of colors is preferred over a single-color coloring. There is a tendency. Conventionally, in the waterproof structure, in order to perform such coloring, colored synthetic resin particles or inorganic particles are kneaded into the waterproof layer, or the colored particles are dispersed before the waterproof layer is cured. A transparent top coat layer is provided on the waterproof layer in which the particles are embedded or dispersed.

There is also a method in which the colored particles are hardened in a plate shape with a binder, this colored layer is laminated and adhered onto the polyurethane waterproof layer, and a transparent topcoat layer is provided on the colored layer.
Japanese Patent Laid-Open No. 10-7901

  However, the urethane resin composition specifically exemplified in Patent Document 1 is a two-component urethane resin composition in which the main agent and the curing agent are reacted, and when this is applied, the main agent and the curing agent are added. It is necessary to mix, and work is troublesome. In addition, there is a problem that the curing speed is slow, the construction takes a long time, and it is difficult to cure at a low temperature. In Patent Document 1, there is a description that a one-component moisture-curing urethane resin composition can be used, but there is no specific description of blending components and the like that are actually applicable in the waterproofing method. Patent Document 1 does not mention anything about the surface design of the cured urethane resin composition.

  In the conventional technique for coloring the surface of the waterproof structure, the method of kneading the colored particles into the waterproof layer has a problem that the colored particles are buried in the waterproof layer and the colored surface is difficult to form. Furthermore, there is a problem that the waterproof layer turns yellow after construction, and the surface aesthetics and the design effect due to the colored particles are impaired.

  Also, the method of spraying the colored particles on the surface of the waterproof layer sinks into the uncured resin depending on the weight of the sprayed colored particles, and the colored surface of the colored particles becomes difficult to see, so there is a problem that the coloring efficiency is poor. . Further, when the waterproof layer is cured to such an extent that the colored particles do not sink, and then the colored particles are sprayed, the colored particles are caused by the small contact area between the colored particles and the waterproof layer. There is a problem that it is easy to drop off.

  In addition, the method of adhering a colored layer obtained by solidifying colored particles with a binder onto a waterproof layer has a problem that the cost of an extra colored layer is increased and the work cost is increased due to an increase in steps required for construction.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a waterproof structure and a waterproof method capable of constructing a high weatherproof waterproof layer having a design appearance and / or a slip-resistant rough surface in a short time. And

  In order to achieve the above object, the present invention provides a highly weather-resistant polyurethane waterproof layer formed by curing a one-component moisture-curable urethane resin composition on the surface of a waterproof substrate, and a foil-like chip is formed on the polyurethane waterproof layer. And a waterproof structure in which at least one of particles and particles is fixed in a dispersed state.

  In the waterproof structure of the present invention, the foil-shaped chip is preferably a colored chip made of a synthetic resin that is exposed and fixed to the surface of the polyurethane waterproof layer.

  The granular material may be an inorganic particle or an organic particle that imparts a slip-resistant rough surface that is at least partially exposed and fixed to the surface of the polyurethane waterproof layer.

  Furthermore, it is preferable that the polyurethane waterproof layer is directly provided on the surface of the substrate.

Moreover, it is preferable that the density of the said 1 liquid moisture hardening type urethane resin composition is the range of 1.2-2.2 g / cm < ³ >.

  In the waterproof structure of the present invention, a top coat layer such as a transparent layer may or may not be formed on the surface of the highly weather-resistant polyurethane waterproof layer.

  In the present invention, the one-component moisture-curing urethane resin composition is applied to the surface of the waterproof substrate to form an uncured resin layer, and the surface of the uncured resin layer includes a foil-like chip and a granular material. Sprinkling at least one and then curing the uncured resin layer to form a highly weather-resistant polyurethane waterproof layer in which at least one of the foil-shaped chip and the granular material is fixed in a dispersed state. I will provide a.

  In the waterproof construction method of the present invention, the foil-shaped chip is preferably a colored chip made of a synthetic resin that is exposed and fixed to the surface of the polyurethane waterproof layer.

  The granular material may be an inorganic particle or an organic particle that imparts a slip-resistant rough surface that is at least partially exposed and fixed to the surface of the polyurethane waterproof layer.

  Furthermore, it is preferable that the polyurethane waterproof layer is directly provided on the surface of the substrate.

Moreover, it is preferable that the density of the said 1 liquid moisture hardening type urethane resin composition is the range of 1.2-2.2 g / cm < ³ >.

  In the waterproofing method of the present invention, a step of forming a top coat layer such as a transparent layer on the surface of the highly weather resistant polyurethane waterproof layer may be provided, or the step may be omitted.

In the present invention, the “foil shape” means a three-dimensional shape having at least two planes facing each other with a minute interval (thickness), and is typically a thin plate shape or a thin film shape. The spacing is generally in the range of 0.0001-5 mm, preferably 0.001-3 mm, more preferably 0.01-1 mm. The surface area of the plane is relatively large compared to the cross-sectional area between the planes, and is typically 0.01 mm ^{2 to} 1000 mm ² , preferably 0.1 mm ^{2 to} 500 mm ² , more preferably 1 mm ^2. ˜100 mm ² . The ratio of the area of the plane to the cross-sectional area between the planes is typically 2 or more, preferably 5 or more, more preferably 10 or more. Generally, the size (length of the longest part) of the foil-shaped chip used in the present invention is 0.01 to 10 mm, preferably 0.1 to 5 mm, more preferably 0.5 to 3 mm.

  In the present invention, “granular” means any shape other than the “foil shape”, and includes various shapes such as a substantially spherical shape, a substantially spindle shape, a substantially cube shape, and a substantially rectangular parallelepiped shape. The particle size of the “granular” product of the present invention means the length of the longest part of the object. The “granular” product is preferably spherical.

  The waterproof structure of the present invention can eliminate the primer layer and the topcoat layer in a short time by directly forming the polyurethane waterproof layer formed by curing the one-component moisture-curable urethane resin composition on the surface of the substrate. Can be constructed.

  In addition, by fixing the foil-like chip in a dispersed state to the polyurethane waterproof layer, it is possible to give a design appearance to the polyurethane waterproof layer. By using a combination of foil-shaped chips of various colors as appropriate, it is novel and original. It is possible to provide a waterproof structure having a beautiful design appearance. In particular, by using a foil-like chip having a metallic luster, it is possible to prevent birds such as pigeons and cormorants from approaching, and to avoid or reduce contamination / decrease in the appearance of the waterproof structure due to excrement of the birds.

  Furthermore, by fixing the granular material to the polyurethane waterproof layer in a dispersed state, a slip-resistant rough surface can be formed on the surface of the polyurethane waterproof layer, and slippage due to water wetting can be prevented to improve safety.

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of a waterproof structure according to the present invention. FIG. 1 is a perspective view of the waterproof structure in partial cross-sectional view, and FIG. 2 is a cross-sectional view. In these drawings, reference numeral 1 denotes a substrate, 2 denotes a highly weather-resistant polyurethane waterproof layer (hereinafter referred to as a polyurethane waterproof layer), and 3 denotes a foil-like chip.

  In the waterproof structure of this embodiment, a polyurethane waterproof layer 2 formed by curing a one-component moisture-curing urethane resin composition is formed on the surface of a base 1 to be waterproofed, and a foil chip 3 is formed on the surface of the polyurethane waterproof layer 2. The structure is fixed in a dispersed state.

  The base 1 is not particularly limited, and various types such as a rooftop of a building, a roof, an outer wall, a floor surface of a room that requires waterproofing, a terrace, a sidewalk, a roadway, a floor surface of an exercise facility such as a pool or a tennis court. And the surface of the solid structure. The material of the substrate 1 is not particularly limited, and examples thereof include metals such as concrete, mortar, asphalt pavement, steel plates, tiles, bricks, stones, gypsum boards, slate, glass, wood, plastics and the like. .

The polyurethane waterproof layer 2 is formed by curing a one-component moisture-curing urethane resin composition, and for example, those described in US 2002/0156168 can be suitably used. In particular, it is obtained by curing a one-part moisture curable urethane resin composition prepared by controlling the amount of moisture such as adsorbed moisture to be substantially eliminated, including an inorganic powder filler such as BaSO ₄ and a pigment. Are preferred. It is desirable that the polyurethane waterproof layer 2 has a weather resistance that does not change its physical properties and luster for at least several years under outdoor sunlight exposure conditions, and has hardly yellowing or non-yellowing. The polyurethane waterproof layer 2 can be used not only as a coating for the substrate 1 but also as a sealant for the substrate 1.

The polyurethane waterproof layer 2 is preferably one in which the density of the one-component moisture-curable urethane resin composition before curing is in the range of 1.2 to 2.2 g / cm ³ . When the density is less than 1.2 g / cm ³ , when the foil-shaped chip 3 is sprayed on the surface of the layer made of the one-component moisture-curable urethane resin composition before curing, the foil-shaped chip 3 is applied to the layer. It becomes easy to sink and it becomes difficult to finish it in a design appearance. On the other hand, when the density exceeds 2.2 g / cm ³ , the blending ratio of the inorganic powder filler and pigment of the resin composition is increased, the flow is poor, and it is difficult to spread, so workability is deteriorated.

  This polyurethane waterproof layer 2 is formed directly on the surface of the substrate 1. In the conventional waterproofing method, a primer layer is applied to the surface of the base 1 and a polyurethane waterproof layer is formed thereon. In the present invention, the one-component moisture-curing urethane resin is applied to the surface of the base 1 to be waterproofed. By applying and curing an uncured resin layer made of the composition, the polyurethane waterproof layer 2 can be firmly adhered to the surface of the substrate 1. Moreover, since the waterproof structure of this invention uses the polyurethane waterproof layer 2 formed by hardening | curing 1 liquid moisture hardening type urethane resin composition, hardening progresses also in a low-temperature environment.

  The material of the foil-like chip 3 fixed in a dispersed state on the surface of the polyurethane waterproof layer 2 is arbitrary, but preferably various materials having good adhesion to the polyurethane waterproof layer 2, for example, synthetic resins such as polyester; Metals such as gold, silver, copper, and aluminum; inorganic compounds such as silica, mica, titanium oxide, and chromium oxide; special materials such as liquid crystal substances; transparent or translucent materials such as polyacrylate; and others. Specifically, as a foil-shaped chip, for example, a synthetic resin-colored chip obtained by roughly pulverizing a synthetic resin film colored with a pigment, an inorganic chip such as a mica flake, or a fine metal foil is used as it is. Among them, a synthetic resin colored chip is preferable.

  The color tone of the foil-shaped chip 3 is also arbitrary and is appropriately selected in order to obtain a desired design appearance. Preferably, the foil-shaped chips 3 having two or more colors are fixed in a dispersed state. It is also possible to use two or more different colors in one foil chip. As a color arrangement mode of different colors, for example, a pattern in which the surface of a single foil-shaped chip made of the same material is divided and each divided surface is colored differently, or a single foil-shaped chip is made of different materials Examples of the assembly of parts include a pattern for obtaining a plurality of color schemes according to colors unique to each material. In addition, when a chip made of a special material whose color changes depending on the viewing angle, temperature, and other factors of the observer is used as the foil-shaped chip, a unique design can be obtained. In addition, the foil-shaped chip can be a laminated body composed of layers of different colors, materials, or tactile sensations (textures), and specifically, laminated aluminum pieces are exemplified.

  In addition, when the foil-like chip | tip which has a metallic luster based on an aluminum piece etc. is used, the approach to the waterproof structure of birds, such as a pigeon and a shark, can be suppressed. Therefore, it becomes possible to avoid or reduce contamination / decrease in the appearance of the surface of the waterproof structure due to excrement of birds.

The surface shape of the foil-shaped chip 3 is arbitrary, and can be, for example, a geometric shape such as a polygon, a circle, or an ellipse, or an artificial pattern such as a star, flower, or heart. Further, minute irregularities may be provided on the surface of the foil-shaped chip 2 by embossing or the like. The application amount of the foil-like chip 3 to the polyurethane waterproof layer 2 is too large at 450 g / m ² , which is meaningless. Actually, it is 100 g / m ² or less, and 5-40 g / m ² is preferable depending on preference.

  The waterproof structure of the present embodiment can omit the primer layer and the topcoat layer by directly forming the polyurethane waterproof layer 2 formed by curing the one-component moisture-curable urethane resin composition on the surface of the substrate 1, Construction can be done in a short time. Further, by fixing the foil-shaped chip 3 to the polyurethane waterproof layer 2 in a dispersed state, it is possible to give a design appearance to the polyurethane waterproof layer 2, and by using the foil-shaped chips 3 of various colors in appropriate combinations, It is possible to provide a waterproof structure having a new and original beautiful design appearance.

  FIG. 3 illustrates a case where the waterproof structure according to the previous embodiment is constructed as an example of the waterproof method according to the present invention. In this waterproof construction method, a one-component moisture-curing urethane resin composition is applied to the surface of a substrate 1 to be waterproofed to form an uncured resin layer 4, and a foil chip 3 is sprayed on the surface of the uncured resin layer 4. Then, the uncured resin layer 4 is cured to form the polyurethane waterproof layer 2 to which the foil-like chip 3 is fixed in a dispersed state.

As the one-component moisture curable urethane resin composition used here, for example, those described in US 2002/0156168 can be suitably used. For example, in the present invention, a polyol component and a diisocyanate component are mixed and stirred to prepare an isocyanate prepolymer containing more than 2% by weight of monomeric diisocyanate, and an inorganic powder filler, a pigment and a solvent are added to the prepolymer. By dispersing, the water introduced by these additives reacts with the prepolymer to form a mixture having a water content of 0.01% by mass or less, to which a H ₂ O reactive latent curing agent and a catalyst (necessary) 1 component), and a one-component moisture-curable urethane resin composition prepared by adding other additives as necessary, can be used particularly suitably. More specifically, 28-34% by mass of the isocyanate prepolymer, 52-56% by mass of the inorganic powder filler and the pigment, 14-16% by mass of the solvent, 4% by mass of the latent curing agent. The 1 liquid moisture hardening type urethane resin composition which contains can be used preferably.

  As the polyol component, those conventionally known as a polyol component for producing a polyurethane resin can be used, in particular, a mixture of a polyalkylene ether polyol and a polyester polyol, and a polyalkylene ether polyol and a polyester polyether polyol, a polyester polycarbonate diol or Mixtures with polyhydroxy acrylate are preferred. The polyalkylene ether polyol is preferably polypropylene glycol or polyethylene glycol. As the polyester polycarbonate diol, polycarbonate of 6-hydroxyhexanoic acid-6-hydroxyhexyl ester is preferable.

  As the diisocyanate component, conventionally known diisocyanate components for producing polyurethane resins can be used. Specifically, 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate can be used. (2,6-TDI), 4,4′-diphenylmethane diisocyanate (4,4′-MDI), 2,4′-diphenylmethane diisocyanate (2,4′-MDI), p-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate Aromatic polyisocyanates such as xylylene diisocyanate (XDI) and 1,5-naphthalene diisocyanate (NDI); aliphatic polyisocyanates such as hexamethylene diisocyanate (HDI); isophorone diisocyanate, H6XDI (hydrogenated X) I), cycloaliphatic polyisocyanates such as H12MDI (hydrogenated MDI); carbodiimide-modified polyisocyanates of the above polyisocyanates, or their isocyanurate-modified polyisocyanates, and combinations of one or more of these Used as. In particular, isophorone diisocyanate (IPDI: 1-isocyanate-3,3,5-trimethyl-5-isocyanate-methylcyclohexane) is preferable.

Examples of the inorganic powder filler include barium sulfate (BaSO ₄ ), calcium carbonate, talc, silica powder, and the like, and barium sulfate and calcium carbonate are preferable. The inorganic powder filler is preferably blended in a state where it is sufficiently dried and substantially free of adsorbed moisture.

  Examples of the pigment include colored pigments such as iron oxide, titanium oxide, yellow lead, red rose, quinacridone pigment, phthalocyanine blue, and carbon black.

  The solvent can be appropriately selected from solvents such as aliphatic hydrocarbons, aromatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, esters, ketones, etc. Preferred solvents are ethyl acetate, butyl acetate , Methyl ethyl ketone, methoxypropyl acetate, toluene, xylene and the like, and one or more of these solvents may be used in combination.

Examples of the H ₂ O reactive latent curing agent include oxazolidine, bisoxazolidine, ketimine, and aldimine.

  Examples of the catalyst include p-toluenesulfonic acid, dibutyltin dilaurate, zinc chloride, and organic acid anhydrides.

  As a method for applying the one-component moisture-curable urethane resin composition to the surface of the substrate 1, various conventionally known application methods in the coating field can be used, and for example, an air spray coating method can be used.

  After applying the one-component moisture-curing urethane resin composition to the surface of the substrate 1 to form the uncured resin layer 4, the foil-shaped chips 3 are sprayed on the surface of the uncured resin layer 4. As a method of spraying the foil-like chips 3, a method of flying the foil-like chips 3 with air can be used. When using foil-like chips 3 of two or more colors, either the method of mixing the foil-like chips 3 of the respective colors and blowing them together or the method of blowing off the foil-like chips 3 of the respective colors may be used.

  The uncured resin layer 4 is cured by moisture in the air and / or moisture contained in the substrate 1 to form the polyurethane waterproof layer 2 to which the foil-like chip 3 is fixed in a dispersed state.

  FIG. 4 is a view showing another embodiment of the waterproof structure according to the present invention. In the waterproof structure of this embodiment, a waterproof polyurethane layer 2 formed by curing a one-part moisture-curing urethane resin composition is formed on the surface of the base 1 to be waterproofed, and the granular material 5 is dispersed in the polyurethane waterproof layer 2. The slip-resistant rough surface is formed on the surface of the polyurethane waterproof layer 2.

  The substrate 1 and the polyurethane waterproof layer 2 can be the same as the substrate 1 and the polyurethane waterproof layer 2 described in the above embodiment. Examples of the granular material 5 include inorganic granular fillers such as sand, crushed stone, and glass beads; and synthetic resin beads such as transparent plastic spherical particles. The particle size of the granular material 5 can be set according to the use application of the waterproof structure, and is usually preferably about 0.1 mm to several mm. Moreover, although the granular material 5 is normally used without coloring, you may color as needed. When coloring the granular material 5, you may implement coloring by a single color, and you may mix the several granular material 5 previously colored by the different color. In addition, you may give different coloring to the surface of each chip | tip of the granular material 5. FIG.

  This waterproof structure can be produced by a waterproof method similar to that of the above embodiment. That is, the one-component moisture-curing urethane resin composition is applied to the surface of the substrate 1 to be waterproofed to form the uncured resin layer 4, and the granular material 5 is sprayed on the surface of the uncured resin layer 4. The cured resin layer 4 is cured to form the polyurethane waterproof layer 2 in which the granular material 5 is fixed in a dispersed state. The weight of the granular material 5 is adjusted in such a range that the chip is not completely buried in the uncured resin layer 4 and is simply attached to the uncured resin layer and does not easily peel off after the resin layer is cured.

  In the waterproof structure according to this example, the primer waterproof layer and the top coat layer can be omitted by directly forming the polyurethane waterproof layer 2 formed by curing the one-component moisture-curable urethane resin composition on the surface of the substrate 1, Construction can be done in a short time. Further, by fixing the granular material 5 to the polyurethane waterproof layer 2 in a dispersed state, a slip-resistant rough surface can be formed on the surface of the polyurethane waterproof layer 2, and slipping due to water wetting can be prevented to improve safety.

  In addition, each said Example is only an illustration, This invention is not limited to these Examples, A various change is possible. For example, both a foil-like chip and a granular material may be fixed to a polyurethane waterproof layer to form a slip-resistant rough surface having a unique design appearance.

  In the present invention, although not necessarily required, a top coat layer such as clear or matte may be provided on the surface of the polyurethane waterproof layer. Various coloring may be given to a topcoat layer, for example, a colored transparent layer colored with colorants, such as a colorless transparent layer or dye, may be sufficient as a topcoat layer. Further, this is not necessarily required in the present invention, but a primer layer used in a conventional waterproofing method may be provided on the surface of the base.

It is the perspective view which carried out the partial cross section view which shows one Example of the waterproof structure of this invention. It is sectional drawing of the same waterproof structure. It is the perspective view which looked at the partial cross section explaining the waterproofing construction method of this invention. It is the perspective view which carried out the partial cross section view which shows the other Example of the waterproof structure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Substrate 2 Polyurethane waterproof layer 3 Foil-shaped chip 4 Uncured resin layer 5 Granules

Claims (12)

A highly weather-resistant polyurethane waterproof layer formed by curing a one-component moisture-curable urethane resin composition is formed on the surface of a waterproof substrate, and at least one of a foil-like chip and a granular material is dispersed on the surface of the polyurethane waterproof layer Waterproof structure that is fixed with. The waterproof structure according to claim 1, wherein the foil-shaped chip is a colored chip made of a synthetic resin in which at least a part is exposed and fixed to the surface of the polyurethane waterproof layer. 2. The waterproof structure according to claim 1, wherein the granular material is an inorganic particle or an organic particle imparting a slip-resistant rough surface, at least a part of which is exposed and fixed to the surface of the polyurethane waterproof layer. The waterproof structure according to claim 1, wherein the polyurethane waterproof layer is directly provided on the surface of the base. The waterproof structure according to any one of claims 1 to 4, wherein a density of the one-component moisture-curable urethane resin composition is in a range of 1.2 to 2.2 g / cm ³ . The waterproof structure in any one of Claims 1-5 which has or does not have a topcoat layer on the surface of the said polyurethane waterproof layer. A one-component moisture-curing urethane resin composition is applied to the surface of the substrate to be waterproofed to form an uncured resin layer, and at least one of a foil-like chip and a granular material is sprayed on the surface of the uncured resin layer, Subsequently, the uncured resin layer is cured to form a highly weather-resistant polyurethane waterproof layer in which at least one of the foil-shaped chip and the granular material is fixed in a dispersed state. The waterproofing method according to claim 7, wherein the foil-shaped chip is a colored chip made of a synthetic resin that is exposed and fixed to the surface of the polyurethane waterproof layer. The waterproofing method according to claim 7, wherein the granular material is an inorganic particle or an organic particle imparting a slip-resistant rough surface, at least part of which is exposed and fixed to the surface of the polyurethane waterproof layer. The waterproofing method according to any one of claims 7 to 9, wherein the polyurethane waterproof layer is directly provided on the surface of the base. The waterproof method according to any one of claims 7 to 10, wherein the density of the one-component moisture-curable urethane resin composition is in the range of 1.2 to 2.2 g / cm ³ . The waterproofing construction method in any one of Claims 7-11 which has or does not have the process of forming a topcoat layer in the surface of the said polyurethane waterproof layer.

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