JP2002129008A - One-component aqueous waterproofing material composition, waterproofing structure and waterproofing construction method - Google Patents

Abstract

(57) [Problem] To provide an excellent one-pack type water-resistant waterproofing composition for civil engineering construction, which is excellent in workability, using an aqueous polyurethane in which an organic solvent does not evaporate during work. SOLUTION: A one-pack type aqueous waterproof material composition is prepared using an aqueous polyurethane containing a polyurethane having a polyurethane crosslink density CD of 0.05 or more and 1 or less. The content of polyurethane in the aqueous polyurethane is 40% by weight.
Not less than 70% by weight. Further, an inorganic filler may be further added.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-part type water-resistant waterproofing composition used in the field of civil engineering and construction, a waterproofing structure having a waterproofing layer formed by using this composition, and the above-mentioned composition. For a waterproof construction method of forming a waterproof layer using, more specifically, by using a specific aqueous polyurethane, there is no adverse effect on the environment due to the evaporation of the solvent, excellent durability, excellent workability, for civil engineering The present invention relates to a one-component aqueous waterproof material composition, a waterproof structure, and a waterproof construction method.

[0002]

2. Description of the Related Art Polyurethane resins are excellent in various properties such as rubber elasticity, abrasion resistance and durability, and have been widely used as waterproofing compositions applied to civil engineering structures.

However, a conventional waterproofing material composition using a polyurethane resin contains a large amount of an organic solvent for the purpose of improving the impregnation property and adhesiveness to a base and facilitating coating workability. And the performance such as waterproofness is excellent. However, a waterproofing material composition containing a large amount of an organic solvent has problems such as harming the health of workers due to volatilization of the organic solvent during work and affecting the environment. Development of compositions is awaited.

[0004] In addition, two-component reaction-type ones are mainly used as the waterproofing material composition using polyurethane. However, when a two-component type waterproofing material composition is used, two-component type is required at a civil engineering construction site. It is necessary to mix at the ratio of for that reason,
Poor curing may occur due to weighing errors, poor mixing, and the like. Therefore, development of a one-pack type waterproof material composition that does not require on-site measurement has been awaited.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide:
Waterproof polyurethane, wall waterproofing, flooring,
An object of the present invention is to provide a one-part water-based waterproofing material composition for civil engineering and construction useful as a sealing material and the like. Another object of the present invention is to provide a waterproof structure and a waterproofing construction method using a one-component aqueous waterproof material composition.

[0006]

The one-component aqueous waterproofing composition of the present invention comprises an organic polyisocyanate comprising one or more components having an average molecular weight Mw ₁ and an average number of isocyanate groups F ₁ ≧ 2. _A polyurethane obtained by reacting 1 part by weight of an active hydrogen group-containing compound comprising one or more components having an average molecular weight Mw ₂ and an average number of active hydrogen groups F ₂ ≧ 1 with W ₂ parts by weight is converted into water. A waterproofing material composition containing a dispersed aqueous polyurethane, wherein the polyurethane crosslink density C of the polyurethane represented by the following formula 2
D is in the range of 0.05 or more and 1 or less.

[0007]

(Equation 2)

By using polyurethane having a crosslink density CD in the range of 0.05 or more and 1 or less, the water resistance and the adhesion to the substrate are maintained high, and the hardness of the coating film is maintained at an appropriate level. It is possible to follow the temporal change of the groundwork in the building, and it is possible to maintain long-term waterproofness.

Further, since the aqueous waterproofing composition of the present invention is one-part, it does not need to be prepared at a civil engineering construction site.
Insufficient curing can be prevented from occurring due to weighing errors, mixing errors, and the like. Therefore, it is possible for anyone to perform simple and reliable waterproofing.

[0010] The waterproof structure of the present invention comprises a base to prevent water from entering, a primer layer formed as necessary,
And a waterproof layer formed on the surface of the base or the primer layer by drying the coating film containing the one-component aqueous waterproofing material composition.

In the waterproofing structure of the present invention, the waterproofing layer is formed by using the one-pack type aqueous waterproofing material composition using the polyurethane having a crosslink density CD of 0.05 or more and 1 or less as described above. Therefore, it is excellent in water resistance, has high adhesion to an underlayer or a primer layer, and exhibits waterproof performance over a long period of time.

Further, in the waterproofing method of the present invention, a primer layer is formed, if necessary, on the surface of the base to prevent water from entering, and a coating film of the one-part type water-resistant material is formed. The coating film is dried to form a waterproof layer.

In the waterproofing construction method of the present invention, since the one-pack type waterproofing material composition is used as described above, there is no need for measurement at a civil engineering construction site, and poor curing occurs due to a measurement error, mixing failure, or the like. Can be prevented. Further, since the water-based waterproofing material composition is used in the waterproofing construction method of the present invention, it is possible to prevent adverse effects on the health and environment of workers due to the volatilization of the organic solvent during the work.

[0014]

Embodiments of the present invention will be described below. The one-pack type water-resistant waterproofing composition of the present invention can be used as a base material for cement concrete, asphalt concrete, asbestos slate (JIS5403), ALC board, PC
Used by painting on board, FRP, plastic, wood, metal, etc. The shape of the base may be any shape, and as long as the surface of the base of the structure is, for example, any of a spherical surface, a curved surface, an extended surface, a flat surface, a vertical surface, a slope, and a ceiling surface, the waterproofing material composition of the present invention. Can be used to form the waterproof layer.

In the one-pack type aqueous waterproof material composition of the present invention, as described above, an organic polyisocyanate having an average number of isocyanate groups F ₁ ≧ 2 is used as the polyisocyanate. Specifically, naphthalene diisocyanate,
Various fragrances such as isophorone diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, hydrogenated diphenylmethane diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, norbornane diisocyanate, polymethylene polyphenyl polyisocyanate, buretted hexamethylene diisocyanate, and nullated hexamethylene diisocyanate Or a mixture of aliphatic, aliphatic and alicyclic isocyanates.

Further, in the one-pack type aqueous waterproof material composition of the present invention, as described above, an active hydrogen group-containing compound having the number of active hydrogen groups F ₂ ≧ 1 is used as the active hydrogen group-containing compound. Specifically, polyhydric alcohols such as diethylene glycol, butanediol, hexanediol, bisphenol A, trimethylolpropane, glycerin, and pentaerythritol, their alkylene derivatives or their esterified products such as poly (oxyethylene ether) polyol, Examples thereof include polyol compounds such as (oxypropylene ether) polyol, poly (oxyethylene propylene ether) polyol, polyester polyol, polythioether polyol, polyacetal polyol, polytetramethylene glycol, polybutadiene polyol, castor oil polyol and the like, and mixtures thereof.

The polyurethane used in the one-pack type water-resistant waterproofing composition of the present invention has an average molecular weight of Mw ₁ of organic polyisocyanate, ₁ part by weight of organic polyisocyanate, and an active hydrogen group-containing compound. In the case where the average molecular weight is Mw ₂ and the reaction is carried out using an active hydrogen group-containing compound by ₂ parts by weight, the polyurethane crosslink density CD expressed by the above formula 2 is within a predetermined range. That is,
In the present invention, the lower limit of the crosslink density CD is 0.05 or more, preferably 0.1 or more, and the upper limit of the crosslink density CD is 1 or less, preferably 0.4 or less. Polyurethane is used. Polyurethane crosslink density C
When D is smaller than the lower limit, the waterproof layer obtained by reducing the cross-linking ratio of polyurethane is softened, so that the water resistance is deteriorated and the adhesion to the base is deteriorated. If the polyurethane crosslink density CD is larger than the above upper limit, the obtained waterproof layer becomes too hard due to an increase in the polyurethane crosslinking ratio, and it is impossible to follow the temporal change of the foundation of the civil engineering building. This is not preferable because cracks easily occur in the coating film and the waterproof function is reduced.

The polyurethane used in the present invention is dispersed as in the following (1) to (3) to prepare an aqueous polyurethane. (1) An active hydrogen atom-containing compound having the number of active hydrogen groups F ₂ ≧ 1 or a combination of the active hydrogen atom-containing compound and the active hydrogen atom-containing polyvalent amine compound having the number of active hydrogen groups F ₂ ≧ 1 A polyurethane resin having a salt-forming group by reacting an organic polyisocyanate having the number of isocyanate groups F ₁ ≧ 2 with a compound having an active hydrogen atom and a salt-forming group reactive with NCO groups. The polyurethane resin having a salt-forming group is mixed and emulsified in water by a known method using a salt-forming agent to obtain an anionic or cationic aqueous polyurethane. (2) An active hydrogen atom-containing compound having the number of active hydrogen groups F ₂ ≧ 1 or a combination of the active hydrogen atom-containing compound and the active hydrogen atom-containing polyvalent amine compound having the number of active hydrogen groups F ₂ ≧ 1 A nonionic polyurethane resin by reacting an organic polyisocyanate having the number of isocyanate groups F ₁ ≧ 2 with a monoalcohol or a polyhydric alcohol and an ethylene oxide single adduct or an ethylene oxide and propylene oxide adduct. This is mixed and emulsified in water by a known method to obtain a nonionic aqueous polyurethane. (3) An active hydrogen atom-containing compound having the number of active hydrogen groups F ₂ ≧ 1 or a combination of the active hydrogen atom-containing compound and the active hydrogen atom-containing polyvalent amine compound having the number of active hydrogen groups F ₂ ≧ 1 Is reacted with an organic polyisocyanate having the number of isocyanate groups F ₁ ≧ 2 to obtain a polyurethane resin, and this polyurethane resin is forcibly emulsified in water to which a surfactant such as an anion, cation, or nonionic is added. Then, an aqueous polyurethane is obtained.

Here, the above (1), (2) and (3)
In the active hydrogen atom-containing polyvalent amine compound having an active hydrogen group number F ₂ ≧ 1, low molecular weight polyvalent amine such as ethylenediamine, propylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, epoxyamine adduct, High molecular weight polyvalent amine compounds such as polyamide resins are exemplified.

Next, the compound having an active hydrogen atom and a salt-forming group reactive with the NCO group and the corresponding salt-forming agent include (a) a compound having a salt-forming carboxylic acid or sulfonic acid group. Compounds and salt-forming agents corresponding thereto, (b) Compounds having a group which can be a quaternary or tertiary group which can be neutralized with an acid, and salt-forming agents corresponding thereto, (c) Quaternization reaction Compounds containing a halogen atom or a corresponding strong acid ester which causes a corresponding salt forming agent and the like.

Examples of the compound having a salt-forming carboxylic acid or sulfonic acid group include hydroxy acids such as glycolic acid, malic acid, glycine, aminobenzoic acid, alanine, dimethylolpropionic acid, and dimethylolbutanoic acid; Carboxylic acids, polyhydric hydroxy acids, aminosulfonic acids such as taurine and 2-hydroxyethanesulfonic acid, and hydroxysulfonic acids are examples of the corresponding salt-forming agents, such as sodium hydroxide, calcium hydroxide, and the like. Valent metal hydroxides and tertiary amine compounds such as ammonia, trimethylamine and triethylamine.

Examples of the compound having a quaternary or tertiary group which can be neutralized with an acid include alkoxylated amines such as N, N-dimethylethanolamine and N-methyldiethanolamine, and N-methyl Examples include amino alcohols and amines such as -N- (3-aminopropyl) -ethanolamine and N, N-dimethylhydrazine. Examples of the corresponding salt-forming agent include organic acids and inorganic acids such as hydrochloric acid, nitric acid, formic acid, acetic acid, dimethyl sulfate, methyl chloride and benzyl chloride, and compounds having a reactive halogen atom.

The compound containing a halogen atom or a corresponding strong acid ester which causes a quaternization reaction includes, for example, 2-chloroethanol, 2-bromomethanol and the like. Also, corresponding salt forming agents include:
For example, tertiary amines, sulfides, phosphines and the like can be mentioned.

Next, examples of the monoalcohol in the monoalcohol or polyhydric alcohol ethylene oxide alone or in the ethylene oxide and propylene oxide adduct include butanol, pentanol, hexanol, heptanol, octanol, lauryl alcohol, and the like. Examples of the polyhydric alcohol include the above-mentioned polyhydric alcohols.

Next, as the anionic, cationic or nonionic surfactants used for forcibly emulsifying the polyurethane resin, known surfactants usually used in the field of surfactants may be used. Can be.

In the waterproofing material composition of the present invention, the content of the polyurethane in the aqueous polyurethane is preferably from 40% by weight to 70% by weight. If the content of the polyurethane is less than 40%, the volatile component increases, the drying of the coating film is slow, and the shrinkage increases during the drying process, so that cracks are easily generated on the coating film surface, and a uniform coating film is obtained. Since it is not obtained, it is not preferable because it easily causes water leakage. Also,
If the content of the polyurethane is more than 70% by weight, it is not preferable because the composition loses its fluidity and handling becomes difficult.

The waterproofing material composition of the present invention preferably contains an inorganic filler. When an inorganic filler is contained, there is an advantage that drying of the coating film can be accelerated. Also, in order to obtain a high waterproof effect, it is preferable to form a coating film thicker than ordinary paint,
When the inorganic filler is added, there is an advantage that the coating film can be thickened without increasing the content of polyurethane.

Specific examples of the inorganic filler include heavy calcium carbonate, talc, aluminum hydroxide, silica stone powder and the like, and mixtures thereof.

The preferred range of the amount of the inorganic filler added is 10% by weight to 200% by weight based on the solid content of the polyurethane. If the amount of the inorganic filler is less than 10% by weight, the effect of accelerating the drying of the coating film and increasing the thickness of the coating film cannot be obtained, and if the amount of the inorganic filler is more than 200% by weight, the composition It is not preferable because the fluidity of the material is lost and handling becomes difficult.

In the production of the one-pack type aqueous waterproofing material composition of the present invention, the reaction between the organic polyisocyanate and the active hydrogen group-containing compound can be carried out in the absence of a solvent. An organic solvent can be used for the purpose of lowering the viscosity and the like. It is preferable to finally remove the organic solvent by distillation in consideration of problems such as adverse effects on workers' health and effects on the environment. However, if an organic solvent is present in the one-pack type aqueous waterproofing material composition of the present invention, the film-forming property at the time of coating is improved, and it is possible to leave it. It is also possible to add an organic solvent after producing the polyurethane without a solvent, in order to improve the film-forming properties. Since such an organic solvent needs to be volatilized after forming a coating film, its boiling point is 2
Those having a temperature of 50 ° C. or lower are preferable, and the amount of addition is preferably 10% by weight or lower based on the polyurethane. If the amount of the organic solvent exceeds 10% by weight, problems such as adverse effects on the health of workers and effects on the environment become remarkable, which is not preferable. The organic solvent is not particularly limited, but examples thereof include aromatic hydrocarbons such as toluene and xylene, ketones such as acetone and methyl ethyl ketone, ethers such as tetrahydrofuran, and acetic acid such as ethyl acetate and butyl acetate. Esters, dimethylformamide, amides such as N-methylpyrrolidone, butyl cellosolve, carbitol, butyl carbitol,
Solfit and the like.

The one-component aqueous waterproofing composition of the present invention is usually used alone as it is, but other aqueous dispersions such as vinyl acetate, ethylene vinyl acetate, acrylic and acrylic styrene are used. Emulsion of styrene
Latex such as butadiene, acrylonitrile / butadiene, acryl / butadiene, polyethylene,
Polyolefin-based ionomers, polyurethanes, polyesters, polyamides, and epoxy-based aqueous dispersions can be mixed and mixed at an arbitrary ratio for use.

In order to improve various durability such as heat resistance, water resistance and solvent resistance, adhesion, hardness and coating workability of the waterproof layer formed by using the composition of the present invention, the coloring layer is colored. Pigments,
An antioxidant, a stabilizer such as a hydrolysis inhibitor, a leveling agent, or an antifoaming agent are added during or after the production process of the one-part aqueous waterproofing material composition of the present invention, or an isocyanate compound (for example, Duranate WB-40-100,
A water-dispersible crosslinking agent such as Asahi Kasei) and a crosslinking agent such as an epoxy resin can also be used.

Next, the waterproof structure of the present invention is provided with a primer layer, if necessary, on a ground to prevent water intrusion in civil engineering buildings and the like. A waterproof layer is formed by drying a coating film containing the above-mentioned one-component aqueous waterproof material composition.
The one-component aqueous waterproofing material composition described above sufficiently impregnates and adheres to the base without using a primer to form a waterproof layer, but in order to further ensure adhesion, a primer layer is provided on the base. After formation, the one-component aqueous waterproofing material composition of the present invention may be painted. As the primer, a generally known primer can be used, and for example, a polyurethane-based polyflex PR (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) can be exemplified.

Further, in the waterproof structure of the present invention, a reinforcing cloth or the like may be used for the purpose of reinforcing the waterproof layer. As the hard cloth, various organic fibers such as glass fiber, amide fiber, aramid fiber, vinylon fiber, polyester fiber, and phenol fiber, carbon fiber, metal fiber, ceramic fiber, and the like are exemplified. And various combinations of these inorganic fibers. Among them, glass fiber products and the like are preferably used. As the form of fiber, plain weave, satin weave, non-woven fabric,
Although a mat shape or the like can be mentioned, it is desirable to use a mat shape from the viewpoints of an application method, thickness maintenance and the like.

Further, in the waterproof structure of the present invention, a top coat may be applied on the waterproof layer for the purpose of maintaining and improving the appearance and durability of the coating layer. As the top coat, a generally known top coat can be used. Further, for the purpose of protecting the waterproof layer from excessive external force generated during sports or walking, for example, urethane pavement material, mortar, concrete block, FRP, epoxy paint, or the like may be formed on the waterproof layer.

In the waterproof structure of the present invention, the thickness of the waterproof layer is preferably in the range of 0.5 mm to 10 mm. If the thickness of the waterproof layer is smaller than 0.5 mm, the waterproofing of the base is likely to be insufficient, and even if the thickness of the waterproof layer is larger than 10 mm, the waterproof effect cannot be further improved. It is not preferable because the composition is wasted.

In the waterproofing method according to the present invention, a primer layer is formed on the surface of the base to prevent water from entering, if necessary, and a coating film of the above one-component aqueous waterproofing material is formed. The waterproof layer is formed by drying the coating film.

The coating film of the one-component aqueous waterproofing material composition of the present invention is formed by applying a predetermined thickness to a single layer or a plurality of layers using a roll brush, a spray or the like. The thickness of the waterproof layer is preferably in the range of 0.5 mm to 10 mm as described above for the same reason as described above.

When the primer is applied to the surface of the base, about 0.1 to 0.3 kg using a roll brush or the like is used.
/ M ² is preferably applied.

When a top coat layer is applied, the top coat can be applied to a predetermined thickness using a roller brush or the like. In this case, the top coat layer is preferably applied at an application amount of about 0.1 to 0.5 kg / m ² .

[0041]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the examples. Parts in Examples and Comparative Examples represent parts by weight.

(Synthesis Example 1) In a flask previously dried,
As shown in Table 1, polyoxypropylene glycol having a molecular weight Mw ₂ = 400 and the number of active hydrogen groups F ₂ = 2 was added to 100
Parts, 2 parts of trimethylolpropane having a molecular weight Mw ₂ = 134 and the number of active hydrogen groups F ₂ = 3, and a molecular weight Mw ₂ = 14.
8, 9 dimethylolbutanoic acid having the number of active hydrogen groups F ₂ = 9
Part and (average molecular weight Mw ₂ = 340, average number of active hydrogen groups F ₂
= 2.04, W ₂ = 111 parts by weight) were dissolved in 80 parts of methyl ethyl ketone. In addition, the molecular weight Mw ₁ = 17
4, 62.5 parts by weight of tolylene diisocyanate having an isocyanate group number of F ₁ = 2 was charged and reacted at 80 ° C. for 4 hours to obtain an NCO-terminated prepolymer.

This prepolymer was treated with triethylamine6.
After neutralization with 15 parts, the dispersion was dispersed in 208 parts of water, the chain was extended with water, and the solvent was removed.
% Aqueous polyurethane was obtained. The crosslink density CD of the polyurethane in the obtained aqueous polyurethane is 0.086.

(Synthesis Examples 2 to 7) The aqueous polyurethanes of Synthesis Examples 2 to 7 were obtained in the same procedure as in Synthesis Example 1 using the active hydrogen compounds and polyisocyanates shown in Table 1. Crosslink density CD of polyurethane in aqueous polyurethane obtained
Are also shown in Table 1.

[0045]

[Table 1]

In Table 1, * 1 D-400: polyoxypropylene glycol * 1 D-1000: polyoxypropylene glycol * 1 G-1000: polyoxypropylene glycol * 2 TMP: trimethylolpropane * 3 DMBA: dimethylol Butanoic acid * 4 TPMG ... polytetramethylene glycol * 5 PBA ... polybutylene adipate * 6 DMPA ... dimethylolpropionic acid.

Example 1 100 g of the aqueous polyurethane resin obtained in Synthesis Example 1 was mixed with an inorganic filler (manufactured by Nitto Powder Co., Ltd., heavy calcium carbonate NS10) as shown in Table 2.
0) 60 g and a coloring pigment (manufactured by Nippon Denko, acid value chromium ND
-803) 6 g and an antifoaming agent were mixed with a twin mixer (manufactured by Asada Iron and Steel) for 1 hour and defoamed to obtain a one-part aqueous waterproofing composition of Example 1.

(Examples 2 to 5) With the composition shown in Table 2, the same procedure as in Example 1 was carried out to obtain one-part aqueous waterproofing material compositions of Examples 2 to 5.

(Comparative Examples 1 and 2) 100 g of the aqueous polyurethane resin obtained in Synthesis Examples 6 and 7 was added to an inorganic filler (Nitto Powder Processing, heavy calcium carbonate NS100) 60
g and a coloring pigment (manufactured by Nippon Denko, acid value chromium ND-80)
3) 6 g of the defoamer was mixed with a twin mixer (manufactured by Asada Iron and Steel) for 1 hour and defoamed to obtain one-part aqueous waterproofing compositions of Comparative Examples 1 and 2.

[Performance test] Examples 1 to 5 obtained above
In addition, test samples were prepared using the one-pack type aqueous waterproof material compositions of Comparative Examples 1 and 2, and the samples were subjected to a water resistance test. Before and after the water resistance test, an isolated waterproof layer strength test (tensile strength and elongation) and a concrete adhesion test were performed. The test results are shown in Table 2.

(Preparation of Test Sample for Strength Test of Isolated Waterproof Layer) Peeling plate made of polyethylene plate (length 30 cm, width 3)
0 cm, thickness 5 mm), the one-pack type aqueous waterproofing material compositions of Examples 1 to 5 and Comparative Examples 1 and 2 were uniformly applied using a rubber spatula at a rate of 3000 g / m ² , respectively. It was left for one week and peeled off from the release plate to obtain a test sample.

(Preparation of Test Sample for Concrete Adhesion Test) Concrete pavement board (30 cm long, 30 cm wide, 5.5 mm high) whose surface was previously treated with sandpaper
cm) on the surface of each of the one-part aqueous waterproofing compositions of Examples 1 to 5 and Comparative Examples 1 and 2 using a rubber spatula.
Each sample was uniformly applied at a rate of 000 g / m ² and left for one week to obtain a test sample.

(Water Resistance Test) The test sample for the strength test of the isolated waterproof layer and the test sample for the concrete adhesion test were immersed in tap water at 50 ° C. for 30 days to perform a water resistance test. The evaluation after the water resistance test was carried out by observing the appearance of the waterproof layer visually.

(Test Method for Isolated Waterproof Layer Strength Test) With respect to test samples for the isolated waterproof layer strength test before and after the above-mentioned water resistance test, the tensile strength and elongation of the isolated waterproof layer were measured in accordance with JIS A6021.

(Test Method of Concrete Adhesion Test) For a test sample for a concrete adhesion test before and after a water resistance test, an attachment (bonding surface) for an adhesion test of an architectural laboratory using an epoxy adhesive on a waterproof layer of each sample. 4.5 × 4.5cm) and left for 5 hours,
After confirming that the epoxy adhesive was cured, the adhesive strength (kg / cm ² ) was measured using an architectural laboratory type adhesion tester.

[0056]

[Table 2]

As is clear from Table 2, the waterproof layers produced using the one-pack type aqueous waterproof material compositions of Examples 1 to 5 had good appearance before and after the water resistance test, and exhibited a tensile strength of It was large enough and the elongation was large. The concrete adhesion was also sufficiently large before and after the water resistance test.

On the other hand, the waterproof layer produced using the one-pack type aqueous waterproof material composition of Comparative Examples 1 and 2 has blisters and the like on its appearance after the water resistance test, and has a low tensile strength and elongation. In particular, the waterproof layer of Comparative Example 1 melted in the water resistance test, and the tensile strength and elongation could not be measured.

[0059]

According to the one-component aqueous waterproofing composition of the present invention,
Since the polyurethane crosslink density CD contains an aqueous polyurethane containing a polyurethane having a range of 0.05 or more and 1 or less, the obtained waterproof layer has excellent water resistance, excellent adhesion to a base, and a suitable hardness of a coating film. By maintaining it, the waterproof property can be maintained for a long time.

Further, in the waterproof structure of the present invention, since the waterproof layer is formed on the surface of the substrate to prevent water from entering by using the one-component aqueous waterproof material composition, the waterproof layer can be applied to the substrate over a long period of time. Water can be prevented from entering.

Further, in the waterproofing method of the present invention, since the waterproofing is carried out by using the one-part type water-resistant material, the above-mentioned preparation at the civil engineering construction site becomes unnecessary, and the curing due to weighing errors, poor mixing, etc. The occurrence of defects can be prevented.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) E04D 7/00 E04D 7/00 FF term (reference) 4D075 CA38 DC03 EB38 EB56 4F100 AA01 AE01 AK51 AK51B AK51K AT00A BA02 CA13 CA23 EJ862 GB07 JB05B JD05B JL05 4J002 CK041 CK051 DE146 DE206 DJ006 DJ016 DJ046 FA086 FD016 GH01 GH02 HA06

Claims (9)

[Claims] An organic polyisocyanate comprising one or more components having an average molecular weight Mw ₁ and an average number of isocyanate groups F ₁ ≧ 2, W ₁ part by weight, an average molecular weight Mw ₂ and an average number of active hydrogen groups F ₂ ≧ An active hydrogen group-containing compound comprising one or more components of W ₁
A one-part aqueous waterproofing material composition containing an aqueous polyurethane obtained by dispersing a polyurethane obtained by reacting with water by weight with a polyurethane, and a polyurethane cross-linking density CD of the polyurethane represented by the following formula 1 Is in the range of 0.05 or more and 1 or less. (Equation 1) 2. The one-component aqueous waterproofing composition according to claim 1, wherein the content of the polyurethane in the aqueous polyurethane is from 40% by weight to 70% by weight. Composition. 3. The one-pack type water-resistant waterproofing composition according to claim 1, further comprising an inorganic filler. 4. A surface to prevent water from entering and a coating film containing the one-component aqueous waterproofing material composition according to claim 1 on the surface of the substrate. A waterproof structure having a formed waterproof layer. 5. A coating containing the one-pack type aqueous waterproofing material composition according to claim 1, wherein a primer is to be prevented from entering water, a primer layer is formed on the surface of the primer. A waterproof structure having a waterproof layer formed on the primer layer by drying the membrane. 6. The waterproof layer has a thickness of 0.5 mm to 10 m.
The waterproof structure according to claim 4 or 5, wherein the range is m. 7. A coating film containing the one-component aqueous waterproofing material composition according to claim 1 is formed on a surface of a base to prevent water from entering, and the coating film is dried. A waterproofing construction method characterized by forming a waterproofing layer. 8. A coating containing a one-pack type aqueous waterproofing material composition according to any one of claims 1 to 3, wherein a primer layer is formed on a surface of a base to prevent water from entering, and the surface of said primer layer is coated. A waterproofing method, further comprising forming a film and drying the coating film to form a waterproof layer. 9. The thickness of the waterproof layer is 0.5 mm to 10 m.
The waterproofing method according to claim 7 or 8, wherein m is in the range of m.