JP2018003356A - Floor slab waterproof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor slab waterproof structure which makes construction time short, and which is excellent in interlayer adhesion of a floor slab layer, a waterproof material layer and an asphalt pavement layer.SOLUTION: In a floor slab waterproof structure for use, a floor slab layer (A), a floor slab primer layer (B), a urethane waterproof material (C), an adhesion layer (D), and an asphalt pavement layer (E) are stacked in sequence from below. Characteristically, the floor slab primer layer (B) and the adhesion layer (D) are hardened materials of a urethane prepolymer (b2) having a radical-curable compound (b1) and an isocyanate group.SELECTED DRAWING: None

Description

  The present invention relates to a floor slab waterproofing structure excellent in interlayer adhesion of each layer.

  In recent years, early deterioration of road bridge decks including highways has become remarkable due to increasing traffic loads and spraying of antifreezing agents. As a mechanism of this early deterioration, it is thought that rainwater, antifreezing agents, etc. penetrate the structure through the cracks generated in asphalt pavement and reinforced concrete floor slabs, corrode the reinforcing bars and reduce the durability of the structure. It has been.

  As a technique for improving the durability of these road bridge decks, various floor slab waterproof structures in which a floor slab layer, a waterproof material layer, and an asphalt pavement layer are sequentially laminated have been studied.

  As the floor slab waterproof structure, for example, a floor slab waterproof structure in which a floor slab layer, a urethane waterproof material layer, a urethane adhesive layer, and an asphalt pavement layer are sequentially laminated is disclosed (for example, Patent Documents). 1). The urethane resin used for the waterproof material layer and the adhesive layer is low in cost, and thus is highly popular in Japan, but its drying property is slow and shortening the construction period is desired.

JP 2012-117368 A

  The problem to be solved by the present invention is to provide a floor slab waterproofing structure that has a short construction time and is excellent in interlayer adhesion of a floor slab layer, a waterproof material layer, and an asphalt pavement layer.

  From the bottom, the present inventors sequentially laminated a floor slab layer, a floor slab primer layer that is a cured product of a specific composition, a urethane waterproof layer, an adhesive layer that is a cured product of a specific composition, and an asphalt pavement layer. The floor slab waterproofing structure is found to have a short construction time and excellent interlayer adhesion, and the present invention has been completed.

  That is, in the present invention, the floor slab layer (A), the floor slab primer layer (B), the urethane waterproof material layer (C), the adhesive layer (D), and the asphalt pavement layer (E) are sequentially laminated from the bottom. The floor slab primer layer (B) and the adhesive layer (D) are a cured product of a radical curable compound (b1) and a urethane prepolymer (b2) having an isocyanate group. The present invention provides a floor slab waterproofing structure characterized by that.

  Since the floor slab waterproofing structure of the present invention uses a radical curable compound having excellent drying properties as a floor slab primer layer and an adhesive layer, construction time can be shortened. Further, the floor slab waterproofing structure of the present invention is excellent in interlayer adhesion.

  The floor slab waterproofing structure of the present invention includes, from below, a floor slab layer (A), a floor slab primer layer (B), a urethane waterproof layer (C), an adhesive layer (D), and an asphalt pavement layer (E). Is a floor slab waterproofing structure in which the floor slab primer layer (B) and the adhesive layer (D) are a radical curable compound (b1) and a urethane prepolymer (b2) having an isocyanate group. It is a cured product.

  As the floor slab layer (A), for example, cement concrete, asphalt concrete, mortar concrete, resin concrete, permeable concrete, ALC plate, PC plate, metal (steel material) and the like can be used. The shape may be a curved surface, an extended surface, a flat surface, an inclined surface, or the like.

  The floor slab primer layer (B) and the adhesive layer (D) can provide quick drying and excellent adhesiveness with the urethane waterproofing material layer (C), so the radical curable compound (b1) and the urethane It is important that it is a cured product of the prepolymer (b2).

  Examples of the radical curable compound (b1) include radical curable resins and radical curable monomers such as urethane (meth) acrylate, epoxy (meth) acrylate, unsaturated polyester, and polyester (meth) acrylate. Can be used. These radically curable compounds (b1) may be used alone or in combination of two or more.

  Examples of the radical curable compound (b1) include adhesion between the floor primer layer (B) and the urethane waterproof material layer (C), and the urethane waterproof material layer (C) and the adhesive layer (D). It is preferable to use urethane (meth) acrylate and epoxy (meth) acrylate, and it is more preferable to use a radical curable monomer having a hydroxyl group in combination.

  As said urethane (meth) acrylate, what is obtained by making a (meth) acryl compound which has a polyol, polyisocyanate, and a hydroxyl group or an isocyanate group by a conventionally well-known method can be used, for example.

  Examples of the polyol include polyester polyol, polycarbonate polyol, polyether polyol, acrylic polyol, caprolactone polyol, and butadiene polyol. These polyols may be used alone or in combination of two or more.

  The number average molecular weight of the polyol is preferably in the range of 1,000 to 4,000 because the balance between curability and compatibility is further improved.

  The average molecular weight in this invention shows the value measured by the gel permeation chromatography (GPC) method.

  Examples of the polyisocyanate include aromatic diisocyanates such as phenylene diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, and naphthalene diisocyanate; hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, and xylylene diisocyanate. Aliphatic or cycloaliphatic diisocyanates such as isocyanate and tetramethylxylylene diisocyanate; formalin condensates of xylylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, phenylene diisocyanate, polyphenylene polymethylene polyisocyanate, methylene diphenyl disissocyanate Etc. can be used aromatic polyisocyanates carbodiimide-modified products such as 4,4'-diphenylmethane diisocyanate. These polyisocyanates may be used alone or in combination of two or more.

  Examples of the (meth) acrylic compound having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and the like. (Meth) acrylic acid alkyl esters having the following hydroxyl groups; polyethylene glycol monoacrylate, polypropylene glycol monoacrylate, and the like can be used. These compounds may be used alone or in combination of two or more.

  Examples of the (meth) acrylic compound having an isocyanate group include 2- (meth) acryloyloxyethyl isocyanate, 2- (2- (meth) acryloyloxyethyloxy) ethyl isocyanate, and 1,1-bis ((meth)). An acryloyloxymethyl) ethyl isocyanate etc. can be used. These compounds may be used alone or in combination of two or more.

  As the epoxy (meth) acrylate, a bisphenol type epoxy compound or an epoxy compound obtained by mixing a bisphenol type epoxy compound and a novolac type epoxy compound with an unsaturated monobasic acid by a conventionally known method is used. Can be used.

  Examples of the bisphenol type epoxy compound include a glycidyl ether type epoxy compound having two or more epoxy groups in one molecule obtained by reaction of epichlorohydrin and bisphenol A or bisphenol F, methyl epichlorohydrin and bisphenol A or bisphenol F, and the like. A dimethylglycidyl ether type epoxy compound obtained by reacting bisphenol A, an epoxy compound obtained by reacting an alkylene oxide adduct of bisphenol A with epichlorohydrin or methyl epichlorohydrin, or the like can be used. These epoxy compounds may be used alone or in combination of two or more.

  As the novolak type epoxy compound, for example, an epoxy compound obtained by reacting phenol novolak or cresol novolak with epichlorohydrin or methyl epichlorohydrin can be used. These epoxy compounds may be used alone or in combination of two or more.

  Examples of the unsaturated monobasic acid include (meth) acrylic acid, cinnamic acid, crotonic acid, monomethylmalate, monopropylmalate, monobutenemalate, sorbic acid, mono (2-ethylhexyl) malate, and the like. be able to. These unsaturated monobasic acids may be used alone or in combination of two or more.

  Further, the molecular weight of the radical curable resin is determined by the adhesiveness between the floor slab primer layer (B) and the urethane waterproof material layer (C), and the urethane waterproof material layer (C) and the adhesive layer (D). From the viewpoint of further improving the adhesion, the range of 500 to 5,000 is more preferable, and the range of 1,000 to 3,000 is more preferable.

  Examples of the radical curable monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate. However, since the curability is further improved, 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate are preferable, and 2-hydroxyethyl (meth) acrylate is more preferable. These monomers may be used alone or in combination of two or more.

  Examples of the radical curable monomer other than the radical curable monomer having a hydroxyl group include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, decyl (meth) acrylate, β-ethoxyethyl (meth) acrylate, 2-cyanoethyl (meth) ) Acrylate, cyclohexyl (meth) acrylate, diethylaminoethyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, polycaprolactone (meth) acrylate, diethylene glycol monomethyl ether (Meth) acrylic monomers such as di (meth) acrylate, dipropylene glycol monomethyl ether mono (meth) acrylate, 2-ethylhexyl carbitol (meth) acrylate, tris (2-hydroxyethyl) isocyanur (meth) acrylate; (Meth) acrylic monomers having a boiling point of 100 ° C. or higher, such as cyclopentenyloxyethyl (meth) acrylate, dicyclopentenyl (meth) acrylate, phenoxyethyl (meth) acrylate, and the like can be used. These monomers may be used alone or in combination of two or more.

  As said urethane prepolymer (b2), what is obtained by making a polyol and polyisocyanate react by a well-known method can be used.

  As a polyol used as a raw material of the urethane prepolymer (b2), various polyols described above as a polyol that can be used as a raw material of the urethane (meth) acrylate can be used. These polyols may be used alone or in combination of two or more.

  The number average molecular weight of the polyol is preferably in the range of 1,000 to 5,000 from the viewpoint of compatibility with the radical curable compound (b1) and imparting toughness.

  As polyisocyanate used as the raw material of the urethane prepolymer (b2), various polyisocyanates described above can be used as the polyisocyanate that can be used as the raw material of the urethane (meth) acrylate. Among these, polyphenylene polymethylene polyisocyanate is preferable because reactivity with urea urethane and adhesion are further improved. These polyisocyanates may be used alone or in combination of two or more.

  The isocyanate group content (hereinafter abbreviated as “NCO%”) of the urethane prepolymer (b2) is in the range of 10 to 30% by mass because the balance between interlayer adhesion and storage stability is further improved. It is preferable.

  The mass ratio (b1 / b2) of the radical curable compound (b1) and the urethane prepolymer (b2) in the floor slab primer layer (B) and the adhesive layer (D) is determined by interlayer adhesion and storage stability. Since the balance of property improves more, the range of 100 / 10-100 / 60 is preferable.

  The floor slab primer layer (B) is formed from a composition for a floor slab primer layer (B) containing the radical curable compound (b1) and the urethane prepolymer (b2) as essential components, The adhesive layer (D) is formed from an adhesive layer (D) composition containing the radical curable compound (b1) and the urethane prepolymer (b2) as essential components.

  The composition for floor slab primer layer (B) and the composition for adhesive layer (D) may contain other resin components such as acrylic polymer, additives, and the like as other components.

  Examples of the additive include a curing agent, a curing accelerator, a polymerization inhibitor, a pigment, a thixotropic agent, an antioxidant, a solvent, a filler, a reinforcing material, an aggregate, a flame retardant, and a petroleum wax. .

  As the urethane waterproof material layer (C), a known urethane waterproof material composition can be used. For example, a two-component type containing a main agent containing a urethane prepolymer having an isocyanate group and a curing agent. Urethane composition; a moisture-curable urethane composition containing a urethane prepolymer having an isocyanate group can be used.

  The urethane prepolymer contained in the two-component urethane composition is obtained by a conventionally known method of polyol and polyisocyanate.

  As said polyol, polyether polyol, polyester polyol, polycarbonate polyol, polybutadiene polyol, polyacryl polyol, polyisoprene polyol, etc. can be used, for example. These polyols may be used alone or in combination of two or more.

  Examples of the polyisocyanate include 2,4′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, a mixture of 2,4′-diphenylmethane diisocyanate and 4,4′-diphenylmethane diisocyanate, toluene diisocyanate, xylylene diisocyanate, and the like. Can be used. These polyisocyanates may be used alone or in combination of two or more. Among these, it is preferable to use 4,4'-diphenylmethane diisocyanate from the viewpoint that the high strength can be further improved.

  Examples of the curing agent include aromatic amine compounds; aliphatic amine compounds; diol compounds such as ethylene glycol, propylene glycol, and dipropylene glycol; polyether polyols, aminated polyols, and the like. These curing agents may be used alone or in combination of two or more. Among these, it is preferable to use an aromatic amine compound and / or an aliphatic amine compound from the viewpoint that the high strength can be further improved.

  The urethane prepolymer contained in the two-component urethane composition may be reacted with a carbodiimide compound as necessary.

  The NCO% of the urethane prepolymer contained in the two-component urethane composition is preferably in the range of 5 to 40% by mass from the viewpoint of further improving the high strength, and 10 to 30% by mass. More preferably, it is the range.

  Examples of the moisture curable urethane composition include a urethane prepolymer having an isocyanate group obtained by reacting a polytetramethylene glycol and a polyol containing a chain extender with a polyisocyanate, a polyol, a polyisocyanate, and N-2. A urethane compound having an oxazolidine group obtained by reacting with -hydroxyalkyl oxazolidine, a moisture curable urethane composition containing an acid catalyst, and the like can be used.

  The asphalt pavement layer (E) is formed of various asphalts. As the asphalt, for example, straight asphalt, blown asphalt, cat asphalt, Trinidad asphalt, Lakea asphalt and the like can be used.

  Next, the manufacturing method of the floor slab waterproofing structure of this invention is demonstrated.

First, the composition for the floor slab primer layer (B) can be applied on the floor slab layer (A) by a method such as spray coating, roller coating, brush coating, or scissor coating. As a coating amount, it is the range of 0.05-2 kg / m < ² >, for example. After the application, for example, it can be cured at room temperature for 0.5 to 2 hours. The urethane composition forming the urethane waterproof material layer (C) is applied or dispersed. As a method of applying or spraying the urethane composition, for example, spray application, roller application, application by brush, application by wrinkles, and the like can be used. The application amount of the urethane composition is, for example, in the range of 0.5 to 3 kg / m ² . After the application or spraying, for example, it is preferably cured at room temperature for 1 to 6 hours.

Next, the composition for the adhesive layer (D) is applied on the urethane waterproof material layer (C) by a method such as spray application, roller application, application by brush, application by wrinkles, and the like. The coating amount of the adhesive layer (D) composition is, for example, in the range of 0.5 to 3 kg / m ² . After the application, for example, it can be cured at room temperature for 0.5 to 2 hours.

  Next, the asphalt may be rolled onto the adhesive layer (D) and then heated and rolled at, for example, 60 to 120 ° C. After the heating and rolling, solidification may be promoted by cooling to room temperature and spraying water as necessary.

  The floor slab waterproofing structure of the present invention obtained by the above method is excellent in interlayer adhesion. Further, since a radical curable compound having excellent drying properties is used as the floor slab primer layer and the adhesive layer, the construction time can be shortened.

  Hereinafter, the present invention will be described in more detail with reference to specific examples. The average molecular weight is measured under the following GPC measurement conditions.

[GPC measurement conditions]
Measuring device: High-speed GPC device (“HLC-8220GPC” manufactured by Tosoh Corporation)
Column: The following columns manufactured by Tosoh Corporation were connected in series.
"TSKgel G5000" (7.8 mm ID x 30 cm) x 1 "TSKgel G4000" (7.8 mm ID x 30 cm) x 1 "TSKgel G3000" (7.8 mm ID x 30 cm) x 1 “TSKgel G2000” (7.8 mm ID × 30 cm) × 1 detector: RI (differential refractometer)
Column temperature: 40 ° C
Eluent: Tetrahydrofuran (THF)
Flow rate: 1.0 mL / min Injection amount: 100 μL (tetrahydrofuran solution with a sample concentration of 4 mg / mL)
Standard sample: A calibration curve was prepared using the following monodisperse polystyrene.

(Monodispersed polystyrene)
"TSKgel standard polystyrene A-500" manufactured by Tosoh Corporation
"TSKgel standard polystyrene A-1000" manufactured by Tosoh Corporation
"TSKgel standard polystyrene A-2500" manufactured by Tosoh Corporation
"TSKgel standard polystyrene A-5000" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-1" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-2" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-4" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-10" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-20" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-40" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-80" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-128" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-288" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-550" manufactured by Tosoh Corporation

(Synthesis Example 1: Synthesis of Radical Curable Resin (b1-1))
A four-necked flask equipped with a thermometer, stirrer, inert gas inlet and reflux condenser was charged with 270 parts by weight of water, 1980 parts by weight of dicyclopentadiene, 0.5 parts by weight of hydroquinone, and 1370 parts by weight of maleic anhydride. The reaction was performed at 80 ° C. for 4 hours under a nitrogen stream. When the acid value reached 210, 450 parts by mass of ethylene glycol was charged and reacted at 200 ° C. for 6 hours to obtain an unsaturated polyester having dicyclopentadienyl groups at both ends with an acid value of 8. Let this unsaturated polyester be radically curable resin (b1-1).

(Synthesis Example 2: Synthesis of radical curable resin (b1-2))
1850 parts by weight of an epoxy resin (“Epiclon 850” manufactured by DIC Corporation) obtained by reaction of bisphenol A and epichlorohydrin in a four-necked flask equipped with a thermometer, stirrer, inert gas inlet and reflux condenser, methacrylic 860 parts by mass of acid, 1.36 parts by mass of hydroquinone and 10.8 parts by mass of triethylamine were added, the temperature was raised to 120 ° C., and the reaction was performed for 10 hours in the same time to obtain epoxy methacrylate having an acid value of 3.5. This epoxy methacrylate is defined as a radical curable resin (b1-2).

(Synthesis Example 3: Synthesis of radical curable resin (b1-3))
A four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, an air inlet, and a reflux condenser, 500 parts by mass of polypropylene glycol (hereinafter abbreviated as “PPG”) having a number average molecular weight of 1000 and tolylene diisocyanate (Hereafter, abbreviated as “TDI”.) 172 parts by mass were charged and reacted at 80 ° C. for 2 hours under a nitrogen stream. Since the NCO equivalent was almost the theoretical equivalent of 600, it was cooled to 50 ° C. Under an air stream, 0.07 part by mass of hydroquinone was added, 135 parts by mass of 2-hydroxyethyl methacrylate (hereinafter abbreviated as “HEMA”) was added, and the mixture was reacted at 90 ° C. for 4 hours. When NCO% became 0.1% by mass or less, 0.07 part by mass of tertiary butylcatechol (hereinafter abbreviated as “TBC”) was added to obtain urethane methacrylate having a number average molecular weight of 1582. This urethane methacrylate is referred to as a radical curable resin (b1-3).

(Synthesis Example 4: Synthesis of urethane prepolymer (b2-1))
In a four-necked flask equipped with a thermometer, stirrer, inert gas inlet, air inlet, and reflux condenser, 200 parts by mass of polyphenylene polymethylene polyisocyanate (“Millionate MR-200” manufactured by Tosoh Corporation), number average molecular weight 2000 110 parts by weight of polypropylene glycol and 50 parts by weight of polypropylene glycol having a number average molecular weight of 3000 were charged and reacted at 80 ° C. for 5 hours under a nitrogen stream to obtain a urethane prepolymer (b2-1) having an NCO% of 16.0% by weight. It was.

(Synthesis Example 5: Synthesis of moisture-curing urethane (PU-1))
In a four-necked flask equipped with a thermometer, stirrer, inert gas inlet, air inlet and reflux condenser, 300 parts by mass of polyphenylene polymethylene polyisocyanate (“Millionate MR-200” manufactured by Tosoh Corporation), number average molecular weight 700 2 parts by weight of polypropylene glycol, 474 parts by weight of toluene, and 474 parts by weight of ethyl acetate were reacted at 80 ° C. for 5 hours under a nitrogen stream, and moisture-curing urethane (PU-1) having an NCO% of 5.2% by weight. Got.

(Preparation Example 1: Preparation of composition for floor slab primer layer (B-1))
Radical curable compound (b1-1) 20 parts by mass, radical curable compound (b1-2) 15 parts by mass, radical curable compound (b1-3) 15 parts by mass, methyl methacrylate (hereinafter abbreviated as “MMA”). .) 45 parts by mass, 5 parts by mass of HEMA, 40 parts by mass of urethane prepolymer (b2-1), 0.2 parts by mass of 130 ° F. paraffin WAX, curing accelerator (“RP-191” manufactured by DIC Materials Co., Ltd.) 1 0.0 parts by mass, 0.5% by mass of 8% cobalt octylate, and 2 parts by mass of 40% benzoyl peroxide were mixed to prepare a composition for the floor primer layer (B-1).

(Preparation Example 2: Preparation of composition for floor slab primer layer (B-2))
A resin composition for a floor slab primer layer (B-2) is prepared in the same manner as in Preparation Example 1, except that 40 parts by mass of the urethane prepolymer (b2-1) used in Preparation Example 1 is changed to 20 parts by mass. did.

(Preparation Example 3: Preparation of composition for floor primer layer (RB-1))
A composition for a floor primer layer (RB-1) was prepared in the same manner as in Preparation Example 1 except that the urethane prepolymer (b2-1) used in Preparation Example 1 was not added.

(Preparation Example 4: Preparation of composition for urethane waterproofing material layer (C-1))
[Preparation of urea urethane base]
In a four-necked flask equipped with a thermometer, stirrer, inert gas inlet, air inlet and reflux condenser, 600 parts by mass of polypropylene glycol having a number average molecular weight of 1000, 180 parts by mass of polypropylene glycol having a number average molecular weight of 3000, diethyltoluene 200 parts by mass of diamine and 10 parts by mass of 1,4-butanediol were charged to obtain a urea urethane main component.

[Synthesis of urea urethane curing agent]
In a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, an air inlet and a reflux condenser, 130 parts by mass of polypropylene glycol having a number average molecular weight of 1000 and 350 parts by mass of ethylene oxide-modified polypropylene glycol having a number average molecular weight of 3000 Then, 65 parts by mass of polypropylene glycol having a number average molecular weight of 2000 and 340 parts by mass of diphenylmethane diisocyanate were charged and reacted at 80 ° C. for 5 hours under a nitrogen stream to obtain a urea urethane curing agent having an NCO% of 13.5% by mass.

  100 mass parts of urea urethane main ingredients obtained above and 100 mass parts of urea urethane curing agent were mixed to prepare a composition for urethane waterproof material layer (C-1).

(Composition for urethane waterproofing material layer (C-2))
An ultrafast curing two-component urethane composition by spray coating was used as a composition for urethane waterproofing material layer (C-2). The cured product of this composition has a tensile strength (test temperature 23 ° C.) measured in accordance with JIS A6021: 2011 of 10 N / mm ² or more and an elongation at break (test temperature 23 ° C.). 200% or more.

(Composition for adhesive layer (D-1))
The composition for the floor slab primer layer (B-1) obtained in Preparation Example 1 was used as the composition for the adhesive layer (D-1).

(Adhesive layer (D-2) composition)
The composition for floor slab primer layer (B-2) obtained in Preparation Example 2 was used as the composition for adhesive layer (D-2).

(Composition for adhesive layer (RD-1))
The composition for floor slab primer layer (RB-1) obtained in Preparation Example 3 was used as the composition for adhesive layer (RD-1).

(Example 1: Production and evaluation of floor slab waterproofing structure (1))
On the concrete board (25 mm × 50 mm × 50 mm), 0.2 kg / m ^{2 of the} composition for the floor slab primer layer (B-1) obtained in Preparation Example 1 was applied, and allowed to stand at 23 ° C. for a specified time. A primer layer was prepared. Next, 2 kg / m ^{2 of the} composition for urethane waterproofing material layer (C-1) obtained in Preparation Example 4 was applied and allowed to stand at 23 ° C. for a specified time to prepare a urethane waterproofing material layer. Thereafter, 1 kg / m ^{2 of the} composition for the adhesive layer (D-1) obtained in Preparation Example 5 was applied and allowed to stand at 23 ° C. for a specified time to prepare a methacrylic resin adhesive layer. Next, 0.5 kg / m ^{2 of} asphalt emulsion (“HIBRON SA” manufactured by Showa Seisho Kogyo Co., Ltd.) was applied and allowed to stand at 23 ° C. for a specified time. Thereafter, asphalt composite material (“Mild Patch” manufactured by Maeda Road Co., Ltd., hereinafter abbreviated as “AS-1”) was rolled at 23 ° C. to a thickness of 14 mm. Thereafter, the test specimen was left in a high-temperature dryer at 110 ° C. for 30 minutes, and further transferred while the asphalt mixture was hot. After completion of the rolling, the floor slab waterproofing structure (1) was obtained by allowing to cool to room temperature and further spraying water. Here, the specified time is a time until each layer is cured and dried, and the curing and drying time of each layer is free from stickiness due to finger-drying, and a person can get on and work on the next process. It is time until. The same applies to other examples and comparative examples.

[Evaluation of construction time]
The construction time was evaluated by the total curing and drying time of each layer.

[Evaluation of interlayer adhesion (uniaxial tensile test)]
The uniaxial tensile strength of the floor slab waterproofing structure (1) obtained above was measured in accordance with the tensile adhesion test described in “Road Bridge Floor Slab Waterproof Handbook” (page 128). Moreover, the fracture state after the test was visually observed, and interlayer adhesion was evaluated according to the following criteria. The tester used was “Autograph AG-X” manufactured by Shimadzu Corporation.
○: Material failure ×: Delamination

[Evaluation of interlayer adhesion (floor slab primer layer / urethane waterproof material layer)]
The composition for floor primer layer (B-1) is applied onto a slate substrate with a roller (about 0.2 mm thick) and cured under conditions of 23 ° C. The urethane waterproofing material layer (C-1) composition was about 2.0 mm thick, applied with a gold iron, and cured at 23 ° C. A skin gap was inserted between the two layers, and interlayer adhesion was evaluated according to the following criteria.
○: Material failure ×: Delamination

[Evaluation of interlayer adhesion (urethane waterproof layer / adhesive layer)]
The urethane waterproof material layer (C-1) composition obtained above was spray applied to obtain a urethane waterproof material layer sheet (C-1) having a thickness of about 2 mm under the condition of 23 ° C. On this sheet, the composition for the adhesive layer (D-1) was applied by a roller (thickness of about 1 mm) and cured under 23 ° C. conditions. A skin gap was inserted between the two layers, and interlayer adhesion was evaluated according to the following criteria.
○: Material failure ×: Delamination

(Example 2: Production and evaluation of floor slab waterproofing structure (2))
The composition for floor slab primer layer (B-1) used in Example 1 was changed to the composition for floor slab primer layer (B-2), and the composition for urethane waterproof layer (C-1) was urethane waterproofed. The same operation as in Example 1 was conducted except that the composition for the material layer (C-2) was changed and the composition for the adhesive layer (D-1) was changed to the composition for the adhesive layer (D-2). A floor slab waterproofing structure (2) was prepared and evaluated for construction time and interlayer adhesion.

(Comparative Example 1: Fabrication and evaluation of floor slab waterproofing structure (R1))
The composition for floor slab primer layer (B-1) used in Example 1 was changed to the composition for floor slab primer layer (RB-1), and the composition for adhesive layer (D-1) was used for the adhesive layer. A floor slab waterproofing structure (R1) was produced in the same manner as in Example 1 except that the composition (RD-1) was changed, and the construction time and interlayer adhesion were evaluated.

(Comparative Example 2: Production and evaluation of floor slab waterproofing structure (R2))
The composition for floor slab primer layer (B-1) used in Example 1 was changed to the composition for floor slab primer layer (RB-1), and the composition for urethane waterproof layer (C-1) was urethane waterproofed. The same operation as in Example 1 was conducted except that the composition for the material layer (C-2) was changed and the composition for the adhesive layer (D-1) was changed to the composition for the adhesive layer (RD-1). A floor slab waterproofing structure (R2) was prepared, and the construction time and interlayer adhesion were evaluated.

(Comparative Example 3: Production and evaluation of floor slab waterproofing structure (R3))
On a concrete plate (25 mm × 50 mm × 50 mm), 0.2 kg / m ^{2 of} the moisture-curing urethane (PU-1) obtained in Synthesis Example 5 was applied, and allowed to stand at 23 ° C. for a specified time. Produced. Next, 2 kg / m ^{2 of} the urethane waterproof material layer composition (C-1) obtained in Preparation Example 4 was applied and allowed to stand at 23 ° C. for a specified time to prepare a urethane waterproof material layer. Thereafter, 0.2 kg / m ^{2 of} the moisture-curing urethane (PU-1) obtained in Synthesis Example 5 was applied and allowed to stand at 23 ° C. for a specified time to prepare a urethane primer layer. Further, 1 kg / m ^{2 of} the adhesive layer composition (RD-1) obtained in Preparation Example 5 was applied and allowed to stand at 23 ° C. for a specified time to prepare a methacrylic resin adhesive layer. Next, 0.5 kg / m ^{2 of} asphalt emulsion (“HIBRON SA” manufactured by Showa Seisho Kogyo Co., Ltd.) was applied and allowed to stand at 23 ° C. for a specified time. Thereafter, asphalt composite material (“Mild Patch” manufactured by Maeda Road Co., Ltd., hereinafter abbreviated as “AS-1”) was rolled at 23 ° C. to a thickness of 14 mm. Thereafter, the test specimen was left in a high-temperature dryer at 110 ° C. for 30 minutes, and further transferred while the asphalt mixture was hot. After the rolling, the floor slab waterproofing structure (R3) was obtained by cooling to room temperature and watering.

  Table 1 shows the layer structures and evaluation results of the floor slab waterproofing structures (1) to (2) and (R1) to (R3) obtained above.

  It was confirmed that the floor slab waterproofing structures of Examples 1 and 2 of the present invention were excellent in interlayer adhesion. Moreover, the construction in a short time was possible.

  On the other hand, Comparative Examples 1 and 2 are examples in which the floor slab primer layer and the adhesive layer do not contain the urethane prepolymer (b2) having an isocyanate group, but both layers have interlayer adhesion with the urethane waterproof material layer. It was bad.

  Although the comparative example 3 is an example which used moisture hardening type urethane for the floor slab primer layer and the urethane primer layer for the improvement of interlayer adhesiveness, the construction required a long time.

Claims (3)

  Floor slab waterproof structure in which floor slab layer (A), floor slab primer layer (B), urethane waterproof material layer (C), adhesive layer (D), and asphalt pavement layer (E) are sequentially laminated from below The floor primer layer (B) and the adhesive layer (D) are cured products of a radical curable compound (b1) and a urethane prepolymer (b2) having an isocyanate group. Floor slab waterproof structure.   The floor slab waterproofing structure according to claim 1, wherein a mass ratio (b1 / b2) between the radical curable compound (b1) and the urethane prepolymer (b2) is in a range of 100/10 to 100/60.   The floor slab waterproofing structure according to claim 1 or 2, wherein the urethane prepolymer (b2) has an isocyanate group content of 10 to 30% by mass.