JPH1171823A - Sheet waterproof execution method, its waterproofed structure and manufacture of sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the excellent execution workability by installing on a base body a flexible sheet in which the resin composition consisting of the urethane acrylate resin and the polymerizing unsaturated monomer is impregnated in the fiber reinforcement material and solidified so as to be used as a waterproof layer. SOLUTION: The urethane acrylate resin is obtained by reacting polyisocyanate, polyether polyol, and acrylic compound having active hydrogen. The polymerizing unsaturated monomer is the ethylene unsaturated monomer, and includes unsaturated monomer or unsaturated oligomer capable of cross- linking with the urethane acrylate resin. The polyester non-woven fabric is preferable for the fiber reinforcement material. A flexible sheet provided with a surface covering layer can be used as it is in the sheet waterproof construction method. The sheet waterproof execution method, etc., excellent in the execution property can be provided by using the flexible sheet excellent in flexibility at low temperature and waterproof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet for laying a flexible sheet having excellent flexibility and water resistance at low temperatures and having excellent weather resistance and durability on a surface using a synthetic resin adhesive. TECHNICAL FIELD The present invention relates to a waterproofing method and a waterproofing structure using the same, and particularly to a sheet waterproofing method excellent in construction workability, ground followability, and durability, and a method for manufacturing the structure and a flexible sheet.

[0002]

2. Description of the Related Art Conventionally, as a sheet material used in a sheet waterproofing method, a synthetic rubber-based vulcanized rubber sheet, a non-vulcanized rubber sheet, and a thermoplastic resin-based vinyl chloride sheet are exemplified. It is also known that a thermosetting resin such as a polyester resin, an epoxy resin, and an acrylic resin is formed into a sheet shape, and that these thermosetting resins are impregnated into glass fibers, organic fibers, and the like and used as a sheet material. . It is also known that a sheet material having flexibility at room temperature can be obtained by combining an appropriate thermosetting resin such as polyester, epoxy, acrylic, urethane resin and organic fiber. (Japanese Unexamined Patent Publication No.
-275848)

[0003] For the purpose of waterproofing, a flexible FRP sheet using a polyester resin, a vinyl ester resin or the like has been conventionally joined to, for example, a concrete surface or the like. (Japanese Unexamined Patent Publication No. 2-150456) These sheet waterproofing methods can reduce the complexity of on-site FRP impregnation work by a wet method and produce a sheet to be a waterproof layer under quality control at a factory or the like. There is an advantage that a stable quality waterproof layer can be obtained.

[0004]

However, these conventional sheet materials, such as synthetic rubber sheets, have poor surface design and weak sheet strength, so that they are vulnerable to external damage such as tearing and scratching. There was a problem. Further, in the case of a vinyl chloride sheet and a conventional thermosetting resin sheet, under low temperature conditions, the material becomes hard and brittle, loses flexibility, and impairs the ability to follow a substrate such as concrete. To compensate for this lack of followability, an adhesive with high elongation with low temperature dependence is used for the adhesive layer between the underlying concrete and the sheet material. Was inadequate. Generally, by giving the sheet material flexibility, physical properties such as water resistance are reduced, and the waterproof function is impaired. Also, in the conventional sheet waterproofing method, in order to further improve the weather resistance and durability of the surface, after the sheet is laid, it is often the case that wet coating is performed, and the construction process is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to use a sheet having excellent flexibility and durability and weather resistance even under low temperature conditions, and to provide a sheet waterproofing method which is excellent in construction workability. To provide a waterproof structure.

[0006]

Means for Solving the Problems The present inventors have made intensive studies on the above problems and as a result have completed the present invention.

That is, according to the present invention, a resin composition comprising (A) a urethane acrylate resin and (B) a polymerizable unsaturated monomer is impregnated into (C) a fiber reinforcing material and cured on a substrate. A sheet waterproofing method characterized in that a sheet is laid and used as a waterproof layer, preferably that the urethane acrylate resin (A) is obtained from a urethane prepolymer having an isocyanate group and an acrylic compound having active hydrogen, Preferably, the fiber reinforcing material (C) is made of a polyolefin-based or polyester-based nonwoven fabric, and preferably, a flexible sheet having a coating layer having excellent weather resistance and durability is laid on the surface, preferably specified in JIS K-6301. Through a synthetic resin adhesive with a tensile elongation of 30% or more in a tensile test Laying a sheet, providing a waterproof structure characterized by being constructed by the sheet waterproofing method, providing a coating layer having excellent weather resistance and durability on the surface of the equipment, and then (A) urethane acrylate resin and (B) The present invention provides a method for producing a flexible sheet, comprising: spreading a curable resin composition comprising a polymerizable unsaturated monomer, and then spreading and curing a fiber reinforcing material thereon. is there.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The urethane acrylate resin (A) of the present invention is obtained by reacting a polyisocyanate with a polyether polyol and an acrylic compound having active hydrogen.

The polyether polyol referred to here is:
It preferably has a number average molecular weight of 400 or more, and preferably has a number average molecular weight of 600 to 2,000, and examples thereof include polypropylene glycol (hereinafter abbreviated as PPG), polytetramethylene glycol (hereinafter PTMG), and polyoxyethylene diol.

Examples of the polyisocyanate include 2,4-tolylene diisocyanate and its isomer or a mixture of isomers (hereinafter abbreviated as TDI), diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate. Isocyanate, dicyclohexylmethane diisocyanate, tolidine diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, Burnock D-750, Crisbon NX (product of Dainippon Ink and Chemicals, Inc.), Desmodur L (product of Sumitomo Bayer), Coronate L ( Nippon Polyurethane Co., Ltd.), Takenate D102 (Takeda Pharmaceutical Co., Ltd.), etc., and TDI is particularly preferably used.

Examples of the acrylic compound having active hydrogen include 2-hydroxyethyl methacrylate, 2-hydroxypropylene methacrylate, 2-hydroxyethyl acrylate, and 2-hydroxypropyl acrylate.

Examples of the polymerizable unsaturated monomer (B) include an ethylenically unsaturated monomer, an unsaturated monomer or an unsaturated oligomer capable of undergoing a cross-linking reaction with a urethane acrylate resin, and particularly preferably an acryloyl group. And a (meth) acrylate monomer is preferred. For example, methyl acrylate,
Ethyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, decyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, Β-ethoxyethyl acrylate, 2-cyanoethyl acrylate, cyclohexyl acrylate, diethylaminoethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, hexyl methacrylate, decyl methacrylate, methacrylic acid Lauryl, stearyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, phenyl carbitol acrylate, nonylphenyl carbitol acrylate, nonifeno Shi propyl acrylate, N- vinyl pyrrolidone, polycaprolactone acrylate, acryloyloxyethyl phthalate, acryloyloxy succinate, and the like.

As a method for producing the urethane acrylate resin of the present invention, first, a polyisocyanate and a polyether polyol (number average molecular weight is preferably 400 or more, particularly preferably 600 to 2000) are mixed with NCO /
The reaction is carried out so that OH = 2 to 1.5 to produce a compound having a terminal isocyanate group, and then a hydroxyl group-containing acrylic compound is reacted so that the hydroxyl group is substantially equivalent to the isocyanate group. Alternatively, it can also be obtained by first reacting a hydroxyl group-containing acrylic compound with a polyisocyanate and then reacting the resulting isocyanate group-containing compound with a polyether polyol.

The urethane acrylate resin (A) of the present invention
A curing agent is used for the resin composition comprising the polymerizable unsaturated monomer (B), and preferably, an organic peroxide is used. Specifically, known materials such as diallyl peroxide type, peroxy ester type, hydroperoxide type, peroxy ketal type, alkyl per ester type, percarbonate type and the like are used, and are appropriately selected depending on curing conditions. The amount added is a commonly used amount, and is preferably 0.1 to 100 parts by weight of the resin composition.
It is 01 to 4 parts by weight. The above curing agents may be used in combination.

The curing accelerator, that is, a substance having an effect of decomposing an organic peroxide of the curing agent by a redox reaction and facilitating generation of active radicals is, for example, a metal such as a cobalt-based, vanadium-based, or manganese-based metal. Soaps, 3rd
Quaternary amines, quaternary ammonium salts, mercaptans and the like.

As the fiber reinforcing material, those which do not impair the tensile elongation of the resin composition of the present invention are preferable. For example, organic fibers such as polyester, polyethylene, polypropylene, polyurethane, amide, aramid, carbon, vinylon or the like are used. The fibers are used in combination, and the form of the fibers includes plain weave, satin weave, non-woven fabric, mat shape and the like.

In particular, those having a tensile elongation of 30% or more at room temperature, more preferably 70% or more at room temperature, and having no difference in elongation in the vertical and horizontal directions are preferable. Further, a polyester-based nonwoven fabric is preferred from the viewpoint of resin impregnation, and a spunbond type of long fiber is particularly preferred. The resin may be subjected to a surface treatment or a hole-punching treatment by a needle punch in order to improve the impregnation property of the resin, and a binder soluble in a reactive monomer is used as the binder. The weight of fiber reinforcement is
Preferably 30 to 300 g / m ² can be used, and particularly preferably 50 to 120 g / m ² .

The surface coating layer of the flexible sheet of the present invention can follow the flexibility of the sheet and is excellent in weather resistance and durability. Examples thereof include urethane acrylate resins and vinyl ester resins. May use the resin composition of the present invention, but from the viewpoint of weather resistance, the raw material polyisocyanate is preferably an aliphatic isocyanate, specifically, hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate. Isocyanate, hydrogenated 4,4'-
Diphenylmethane diisocyanate.

The vinyl ester resin is preferably a so-called saturated or unsaturated polyester (meth) acrylate obtained by an addition reaction of a carboxyl group at the terminal of a saturated or unsaturated polyester with an unsaturated glycidyl compound; The ends of the skeleton (epoxy resin) are α and β
-An epoxy acrylate obtained by reacting with an unsaturated dibasic acid so as to have an equivalent ratio of 1: 2, alone or as a mixture. Known UV absorbers may be added to these surface coating layers to further improve weather resistance.

As a method for producing a flexible sheet containing the fiber reinforcing material of the present invention, a fiber reinforcing material is impregnated with a resin composition of the present invention on a release material, preferably a release film. , And completely impregnated and defoamed with a roller or the like. Also, by applying a process such as matting or embossing to the surface of the release film to be used, it is possible to transfer those processed surfaces to a flexible sheet. Also, without covering the film from above, sprinkle silica sand, ceramic aggregate, etc. before the resin hardens,
The sheet can also have a design property.

A gel coat resin layer having excellent weather resistance and durability is applied to the surface of the release film in advance, cured, and then impregnated with the resin composition of the present invention and a fiber reinforcing material, and laminated to form a surface coating. A flexible sheet in which the layers are integrated can be obtained. Further, the surface coating layer may be formed integrally with the resin composition and the fiber reinforcing material of the present invention without using a film having a releasing property.

When a sheet is manufactured continuously, the sheet is manufactured continuously while the mixture of the resin composition of the present invention and the fiber reinforcing material is inserted between the layers of the upper and lower release films. The removal method is preferred.

A flexible sheet having no surface tack is obtained by curing at room temperature or by heating and curing in a drying oven at 60 to 90 ° C. for 30 to 120 minutes while leaving release films on both the upper and lower surfaces. be able to.

The thickness of the obtained flexible sheet greatly affects the workability, the flexibility at low temperature, and the ability to follow the substrate, and is preferably 0.1 to 3.0 mm, more preferably 0.4 to 2 mm. If the thickness is smaller than 0.0 mm, the substrate followability is reduced. If it is thicker than this, workability and flexibility at low temperatures are not sufficient.

Since the flexible sheet is excellent in flexibility, it can be easily unrolled even when wound into a roll and can be easily unfolded on site, and can be easily cut with scissors, a cutter, etc. Also has excellent shapeability for complicated shapes such as parts.

In the sheet waterproofing method of the present invention, a flexible sheet provided with a surface coating layer can be used as it is, for example, under conditions of use exposed to acids, alkalis, organic solvents, etc., specifically, in a chemical factory or a food factory. On a floor or the like, a vinyl ester top coat may be used as the surface layer. These surface protective layers do not need to be wet-coated on the sheet after the flexible sheet is laid, and the coating work at the construction site can be reduced. Further, a colorant such as a pigment may be mixed into the surface layer from the aspect of design, or a multi-layer sheet of a patterned vinyl chloride or PET film may be used.

The waterproof structure of the present invention refers to a flexible sheet of the present invention which is used for civil engineering and architectural structures such as floors and roofs of factories, rooftops, open corridors, verandas, outer walls, parking lots, piers, floor slabs, and land. Bases for stadiums, tennis courts, etc., for example, concrete, asphalt, ALC board, PC board, FR
P, plastic, wood, metal, existing waterproof sheet, etc. are constructed as follows.

That is, there is a step of first applying a material called a primer on the substrate. As such a primer, there are various types such as urethane type, epoxy type and polyester type. It is appropriately selected from the viewpoints of properties and substrate conditions. After the primer has dried, the flexible sheet of the present invention is bonded or bonded to a substrate.

As a method for bonding and joining, there is a method using various synthetic resin adhesives. However, as the adhesive, J is used to sufficiently exhibit the followability of the flexible sheet to the substrate.
It is preferable to use a polyester-based, urethane-based, epoxy-based, or acrylic rubber-based adhesive having a tensile elongation of 30% or more specified in ISK-6301. When the elongation is less than 30%, the flexibility of the flexible sheet does not sufficiently follow the substrate, and the crack following property is significantly deteriorated.
In particular, when the urethane acrylate resin composition used in the present invention is used as this adhesive, it has good conformability to the sheet and has excellent elongation to concrete because of its high elongation,
Good workability.

Furthermore, since the urethane acrylate resin composition is a radical-curable resin, it is necessary to take the necessary open time with other sheet construction methods, for example, a solvent-drying adhesive used for bonding vinyl chloride sheets. In addition, rapid construction is possible, and the strength development after laying the sheet is fast because curing proceeds by a radical reaction, and reaches a predetermined strength in about 1 to 2 hours, depending on construction conditions.

The adhesive is preferably applied to a concrete surface in an amount of 0.2 kg to 1.0 kg / m ² with a comb iron.
The sheet wound in a roll shape is spread thereon, and sufficiently pressed by a heavy roller so that no air remains between the sheet and the concrete. When applying with a comb iron, it is also preferable to add a filler such as charcoal, talc, silica or the like to the adhesive in order to improve workability and comb combing. In addition, mechanical bonding such as rivets, double-sided pressure-sensitive adhesive tape, or the like can be used in combination with the adhesive.

The seam between the sheets can be finished by laminating with the resin composition of the present invention and the fiber reinforcing material, or by filling with a urethane sealing material. Also, as a dry method, the flexible sheet of the present invention can be bonded with a double-sided pressure-sensitive adhesive tape to form a seam treatment. , 0.1 to 0.5 mm is appropriate.

The thus obtained waterproof structure may be further coated with various paints, or provided with a synthetic resin layer such as urethane floor material or an FRP waterproof material layer.

[0034]

The present invention will be described below in detail with reference to examples and comparative examples, but the present invention is not limited to these examples. In the description, “parts” and “%” are based on weight unless otherwise specified.

Synthesis Example 1 [Urethane acrylate (UA-
Preparation of 1)] In a 1-liter four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, an air inlet, and a reflux condenser, 1000 g of propylene glycol (abbreviated as PPG) having a number average molecular weight of 1000 is tolylenedied. 350 g of isocyanate (abbreviated as TDI) was charged and reacted at 80 ° C. for 4 hours under a nitrogen stream. Since the NCO equivalent was almost a theoretical equivalent value of 600, the mixture was cooled to 50 ° C. Under an air stream, 0.14 g of hydroquinone was added, 260 g of 2-hydroxyethyl methacrylate (abbreviated as HEMA) was added, and the mixture was heated at 90 ° C. for 5 hours.
Allowed to react for hours. When the NCO% becomes 0.1% or less, 0.16 g of t-butyl catechol (abbreviated as TBC)
Was added to obtain a polyether urethane acrylate resin composition. This was diluted and dissolved in 1072 g of methyl methacrylate (abbreviated as MMA) to obtain a urethane acrylate resin (UA-1) having a nonvolatile content of 60%.

Synthesis Example 2 [Urethane acrylate (UA-
2) Adjustment] Polytetramethylene glycol (abbreviated as PTMG) 100 having a number average molecular weight of 1000 in the same manner as in Synthesis Example 1 above.
A polyether urethane acrylate resin composition was synthesized using 0 g, TDI 350 g, and HEMA 260 g.
The obtained resin composition was diluted and dissolved in 1072 g of MMA,
Urethane acrylate resin with 60% non-volatile content (UA-
2).

Synthesis Example 3 [Preparation of urethane acrylate (UA-3) for surface coating] In the same manner as in Synthesis Example 1, PP having a number average molecular weight of 700 was used.
G350g, hexamethylene diisocyanate (HD
I) 84 g, isophorone diisocyanate (IPDI)
A polyether urethane acrylate resin composition was synthesized using 111 g and 130 g of HEMA. The obtained resin composition was diluted and dissolved in 450 g of MMA to obtain a nonvolatile content of 60%.
Urethane acrylate resin (UA-3).

Example 1 (Production of Flexible Sheet
Construction test) 100 parts of UA-3 prepared in Synthesis Example 3 on a 150 μm thick polyester film, 2.0 parts of Parkadox 16 (hardener, manufactured by Kayaku Akzo Co., Ltd.), and 5.0 parts of gray pigment
Then, the mixture was applied to a thickness of 0.3 mm, and cured by heating at 80 ° C. for 15 minutes to form a surface coating layer.
2 parts of BPO paste (benzoyl peroxide 50%), 0.4 part of 6% cobalt naphthenate, and 0.5 part of DMA (dimethylaniline) were added to 100 parts of UA-1 prepared in Step 1, and the mixture was stirred and dissolved. And 10
Wt% polyester nonwoven fabric (trade name: EL-559)
0, manufactured by Japan Vilene Co., Ltd.), covered with a polyester film from above, impregnated and defoamed with a roller, gelled, and post-cured at 80 ° C for 2 hours with the polyester film attached to both sides Then, the polyester film was released from the mold to obtain a flexible sheet having no surface tack.

The sheet is coated with 0.2 kg / m ² of primer PD (one-component moisture-cured urethane, manufactured by Dainippon Ink and Chemicals, Inc.) on the concrete surface of the veranda and dried. 180 (vinyl urethane resin manufactured by Dainippon Ink and Chemicals, Inc.) / Aerosil /
Dimethylaniline / 6% cobalt naphthenate / BPO
(Benzoyl peroxide 50%) to 100/5 /
An adhesive compounded in a ratio of 0.05 / 0.4 / 1.5 is 0.3.
After applying kg / m ² , the sheets were pressure-bonded with a roller, and the seams of the sheets were laminated with UA-1 and nonwoven fabric EL-5590 to perform a bonding treatment.

A sample having a size of 30 × 30 cm was taken from the waterproof layer. In an atmosphere of -20 ° C and 80 ° C and a humidity of 95% or more, a cold / hot repeated test was performed 30 cycles, each cycle consisting of 4 hours at 8 hours and 8 hours at each temperature. Etc. did not occur. In addition, there was no remarkable change in appearance such as discoloration even after 6 months of actual exposure outdoors.

Example 2 (Manufacturing and execution test of flexible sheet) 100 parts of UA-3 prepared in Synthesis Example 3 was put on 100 parts of a polyester film having a thickness of 150 μm, and Parkadox 16 (curing agent, manufactured by Kayaku Akzo Co., Ltd.) ) 2.0 parts, gray pigment 5.0
Then, the mixture was applied to a thickness of 0.3 mm, and was heated and cured at 80 ° C. for 15 minutes to form a surface coating layer.
To 100 parts of UA-2 prepared in the above, 2 parts of BPO paste (benzoyl peroxide 50%), 0.4 parts of 6% cobalt naphthenate, and 0.5 parts of DMA (dimethylaniline) were added and dissolved by stirring. And 10
Wt% polyester nonwoven fabric (trade name: EL-559)
0, manufactured by Japan Vilene Co., Ltd.), covered with a polyester film from above, impregnated and defoamed with a roller, gelled, and post-cured at 80 ° C for 2 hours with the polyester film attached to both sides Then, the polyester film was released from the mold to obtain a flexible sheet having no surface tack.

The sheet is coated with 0.2 kg / m ² of primer PD (one-component moisture-cured urethane, manufactured by Dainippon Ink and Chemicals, Inc.) on a concrete surface on the roof of a building and dried. 180 (vinyl urethane resin manufactured by Dainippon Ink and Chemicals, Inc.) / Aerosil / dimethylaniline / 6% cobalt naphthenate / BPO (benzoyl peroxide 50%) 100/5 / 0.0
0.3 kg of adhesive mixed in the ratio of 5 / 0.4 / 1.5
/ M ² , and pressure-bonded with a roller, and the seam portion of the sheet was laminated with UA-1 and non-woven fabric EL-5590 to perform a bonding process.

A sample of 30 × 30 cm was collected from the waterproof layer. In an atmosphere of -20 ° C and 80 ° C and a humidity of 95% or more, a cold / hot repeated test was performed 30 cycles, each cycle consisting of 4 hours at 8 hours and 8 hours at each temperature. Etc. did not occur. In addition, there was no remarkable change in appearance such as discoloration even after 6 months of actual exposure outdoors.

Example 3 (Construction test) The sheet prepared in Example 1 was applied to a concrete surface of the veranda by primer PD (one-component moisture-cured urethane resin, manufactured by Dainippon Ink and Chemicals, Inc.) at 0.2 kg / m ² is applied and dried, and Dick Binder 520 (solvent-based one-part urethane adhesive, Dainippon Ink and Chemicals, Inc.)
Was applied at 0.3 g / m ² and pressure-bonded with a roller, and the seam portion of the sheet was sealed with the same adhesive to perform a bonding treatment.

A sample was collected from the waterproof layer in a shape of 30 × 30 cm. In an atmosphere of -20 ° C and 80 ° C and a humidity of 95% or more, a cold / hot repeated test was performed 30 cycles, each cycle consisting of 4 hours at 8 hours and 8 hours at each temperature. Etc. did not occur. In addition, there was no remarkable change in appearance such as discoloration even after 6 months of actual exposure outdoors.

Example 4 (Construction test) The sheet prepared in Example 2 was applied to a concrete surface of a veranda by primer PD (one-component moisture-curable urethane resin, manufactured by Dainippon Ink and Chemicals, Inc.) at a rate of 0.2 kg / kg. m ² is applied and dried, and Dick Binder 520 (solvent-based one-part urethane adhesive, Dainippon Ink and Chemicals, Inc.)
Was applied at 0.3 g / m ² and pressure-bonded with a roller, and the seam portion of the sheet was sealed with the same adhesive to perform a bonding treatment.

A sample of 30 × 30 cm was collected from the waterproof layer. In an atmosphere of -20 ° C and 80 ° C and a humidity of 95% or more, a cold / hot repeated test was performed 30 cycles, each cycle consisting of 4 hours at 8 hours and 8 hours at each temperature. Etc. did not occur. In addition, there was no remarkable change in appearance such as discoloration even after 6 months of actual exposure outdoors.

Comparative Example 1 Soft type unsaturated polyester resin (trade name: Polylite FR-110, manufactured by Dainippon Ink and Chemicals, Inc.)
1 part of 55% MEKPO (methyl ethyl ketone peroxide) was added to 100 parts, and after stirring and dissolving, the mixture was spread on a polyester film having a thickness of 150 μm.
Place 2 ply of 0 wt% non-woven fabric (trade name: EL-5590, manufactured by Japan Vilene Co., Ltd.), cover with a polyester film from above, impregnate and defoam with a roller, gelate, and apply polyester film on both sides. 8 with
After curing at 0 ° C. for 2 hours, the polyester film was released from the mold to obtain a flexible sheet having no surface tack.

This sheet was applied to the concrete surface of the veranda in the same manner as in Example 1. A sample having a size of 30 × 30 cm was collected from the waterproof layer. When the same cooling and heating test was performed as in Example 1, peeling occurred in three cycles.

Comparative Example 2 The sheet prepared in Comparative Example 1 was applied to the concrete surface of the veranda in the same manner as in Example 3. A sample having a size of 30 × 30 cm was collected from the waterproof layer. When the same cooling and heating test was performed as in Example 1, peeling occurred in three cycles.

[0051]

According to the present invention, it is possible to provide a sheet waterproofing method excellent in workability and a waterproof structure thereof by using a specific flexible sheet. In particular, the present invention provides a sheet waterproofing method that is excellent in workability by using a flexible sheet made of a urethane acrylate resin having excellent flexibility at low temperatures, having water resistance, and having excellent weather resistance and durability on the surface. Thus, a method for producing a waterproof structure and a flexible sheet thereby can be provided.

Claims (7)

[Claims] 1. A flexible sheet formed by impregnating a resin composition comprising (A) a urethane acrylate resin and (B) a polymerizable unsaturated monomer into (C) a fiber reinforcing material and curing the resin composition on a substrate. A sheet waterproofing method characterized by being used as a waterproof layer. 2. The sheet waterproofing method according to claim 1, wherein the urethane acrylate resin (A) is obtained from a urethane prepolymer having an isocyanate group and an acrylic compound having active hydrogen. 3. The sheet waterproofing method according to claim 1, wherein the fiber reinforcing material (C) comprises a polyolefin-based and polyester-based nonwoven fabric. 4. The flexible sheet has weather resistance on its surface,
The sheet waterproofing method according to any one of claims 1 to 3, further comprising a coating layer having excellent durability. 5. A flexible sheet according to JIS K-63.
The sheet waterproofing method according to any one of claims 1 to 4, wherein the sheet is laid via a synthetic resin adhesive having a tensile elongation of 30% or more in a tensile test specified in 01. 6. A waterproof structure constructed by the sheet waterproofing method according to claim 1. 7. A coating layer having excellent weather resistance and durability is provided on the surface of the equipment, and then a curable resin composition comprising (A) a urethane acrylate resin and (B) a polymerizable unsaturated monomer is developed. A method for producing a flexible sheet, comprising: spreading, then spreading a fiber reinforced material thereon, and curing.