JP2001002985A - Coating material composition for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating material composition for a concrete structure, capable of forming an anticorrosive flexible coating film having oxygen permeation preventing properties and proper water vapor permeation performances. SOLUTION: This coating material composition for coating a concrete structure is a coating material comprising (A) an epoxy resin component composed of at least one kind of a modified epoxy resin selected from an oil modified epoxy resin and a urethane modified epoxy resin and containing one or more epoxy groups in one molecule, (B) a curing agent and (C) aluminum powder having 1-50 μm average particle diameter, contains 0.1-7% of the aluminum powder (C) calculated as pigment volume concentration in the solid content of the coating material and forms a cured coating film from the coating material, having >=100% tensile elongation at break by a tensile test defined by JIS K7127.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint composition for a concrete structure capable of forming an anticorrosive soft coating film having an oxygen permeation inhibiting ability and an appropriate range of water vapor permeability, and a concrete structure using the paint composition. It relates to the method of painting objects.

[0002]

2. Description of the Related Art Deterioration of concrete structures includes deterioration due to salt damage, alkali-aggregate reaction, neutralization, and the like. In order to prevent such deterioration, painting is performed according to the respective deterioration conditions.

[0003] The coating film is required to have performances such as blocking external deterioration factors and following cracks.
In particular, since the alkali-aggregate reaction proceeds in the presence of water, a function of diffusing water in concrete is required in addition to a function of blocking a deterioration factor from the outside. Until now, anticorrosion coating systems corresponding to the respective deterioration mechanisms have been applied, but in recent years, since the deicing agent has been sprayed in winter, concrete bridges already showing deterioration due to alkali-aggregate reaction have been recognized. Deterioration due to salt damage has also been observed, and so-called composite deterioration has come to be seen.

In general countermeasures against deterioration, emphasis is placed on preventing permeation of oxygen and water vapor (a function of blocking deterioration factors). However, composite deterioration has the following disadvantages. The emphasis is placed on (2) permeability of deterioration factors and (3) release of moisture, and in addition to the above-mentioned function of blocking the deterioration factors, which is a general countermeasure against deterioration, releases moisture inside the concrete to the outside of the system. There is a demand for a function of releasing water vapor as a function for causing the water vapor to escape. Heretofore, there has not been found any paint capable of forming a coating film having a large elongation of the coating film and simultaneously satisfying the above-described blocking function and water vapor releasing function.

It is an object of the present invention to provide a concrete paint having a high elongation, a function of blocking deterioration factors and a function of releasing water vapor, and an excellent deterioration prevention not only for general deterioration but also for composite deterioration. It is an object of the present invention to provide a paint capable of forming a coating film capable of performing the following.

It is another object of the present invention to provide a method of coating a concrete material for forming a coated concrete material having excellent deterioration preventing ability not only against general deterioration but also against complex deterioration.

[0007]

Means for Solving the Problems To achieve the above object, the present inventors have achieved that the above object can be achieved by a paint in which a resin system mainly comprising a modified epoxy resin having flexibility and a curing agent is mixed with aluminum powder. And completed the present invention.

Thus, according to the present invention, there is provided (A) an epoxy resin component having at least one epoxy group in one molecule containing at least one modified epoxy resin selected from an oil-modified epoxy resin and a urethane-modified epoxy resin. ,
A paint containing (B) a curing agent and (C) an aluminum powder having an average particle diameter of 1 to 50 μm, wherein the aluminum powder (C) is contained in a solid content of the paint in a pigment volume concentration of 0.1 to
7% and the cured coating film formed from the coating material is J
It is characterized in that the percentage of tensile elongation at break is 100% or more when the test speed of a No. 1 type specimen is 5 mm / min according to the tensile test method for plastic films and sheets specified in IS K 7127-1989. The present invention provides a coating composition for coating a concrete structure.

Further, according to the present invention, there is provided a method for coating a concrete structure, which comprises applying a sealer to a concrete structure, applying putty if necessary, and then applying the coating composition. Is done.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the coating composition provided by the present invention will be described in more detail.

The coating composition of the present invention comprises the following epoxy resin component (A), curing agent (B) and aluminum powder (C) as essential components.

Epoxy resin component (A) The epoxy resin component, which is the component (A) in the composition of the present invention, contains one or more epoxy groups, preferably one or more epoxy groups per molecule.
It has an average of 1.5 to 5 in the molecule and contains at least one modified epoxy resin selected from an oil-modified epoxy resin and a urethane-modified epoxy resin.

The oil-modified epoxy resin is, for example, a resin obtained by modifying a base epoxy resin such as a glycidyl ether type epoxy resin, a glycidyl ester type epoxy resin, another glycidyl type epoxy resin, or an alicyclic epoxy resin with a fatty acid. is there.

The urethane-modified epoxy resin is
For example, it is a resin obtained by modifying a hydroxyl-containing base epoxy resin with a poly- or mono-isocyanate compound, and the base epoxy resin may be an amine-added epoxy resin in which amines have been reacted in advance.

The glycidyl ether type epoxy resin usable as the base epoxy resin is, for example, an epoxy resin having a glycidyl ether group which can be obtained by reacting a polyhydric alcohol, a polyhydric phenol or the like with epihalohydrin or an alkylene oxide. . Examples of the polyhydric alcohol include ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, neopentyl glycol, butylene glycol, hexanediol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, diglycerin, sorbitol and the like. Can be mentioned. Examples of the polyhydric phenol include 2,2-bis (4-hydroxyphenyl) propane [bisphenol A], 2,2-bis (2-hydroxyphenyl) propane, and 2- (2-hydroxyphenyl)
2- (4-hydroxyphenyl) propane, halogenated bisphenol A, bis (4-hydroxyphenyl) methane [bisphenol F], tris (4-hydroxyphenyl) propane, resorcinol, tetrahydroxyphenylethane, 1,2,3- Tris (2,3-epoxypropoxy) propane, novolak type polyphenol, cresol type polyphenol and the like can be mentioned.

Examples of the glycidyl ester type epoxy resin usable as the base epoxy resin include diglycidyl phthalate, diglycidyl hexahydrophthalate, diglycidyl tetrahydrophthalate, diglycidyl dimer and the like. .

The other glycidyl-type epoxy resins usable as the base epoxy resin include, for example,
Examples thereof include tetraglycidylaminodiphenylmethane and triglycidyl isocyanurate.

The alicyclic epoxy resin usable as the base epoxy resin includes (3,4-epoxy-6)
-Methylcyclohexyl) methyl-3,4-epoxy-
6-methylcyclohexanecarboxylate, (3,4
-Epoxycyclohexyl) methyl-3,4-epoxycyclohexanecarboxylate, bis (3,4-epoxycyclohexylmethyl) adipate, bis (3,4
-Epoxy-6-methylcyclohexylmethyl) adipate, Eporide GT300 (Daicel Chemical Industries, Ltd.)
Trade name, trifunctional alicyclic epoxy resin), Eporide GT400 (manufactured by Daicel Chemical Industries, Ltd., trade name, tetrafunctional alicyclic epoxy resin), EHPE (manufactured by Daicel Chemical Industries, Ltd.), trade name, Polyfunctional alicyclic epoxy resin).

As the base epoxy resin, an aromatic epoxy resin having a glycidyl ether group can be preferably used.

Fatty acids that can be used as a modifier for the base epoxy resin to obtain an oil-modified epoxy resin include:
Dried oil fatty acids, semi-dry oil fatty acids are preferred, as specific examples, linseed oil fatty acids, safflower oil fatty acids, soybean oil fatty acids, sesame oil fatty acids, eno oil oil fatty acids, hemp oil fatty acids, grape kernel oil fatty acids, kiri oil fatty acids, Corn oil fatty acids, sunflower oil fatty acids, cottonseed oil fatty acids, walnut oil fatty acids, rubber seed oil fatty acids, euca deer oil fatty acids, fish oil fatty acids, hydiene fatty acids, tall oil fatty acids, and dehydrated castor oil fatty acids. The fatty acid is 1
They can be used alone or as a mixture of two or more.

The oil-modified epoxy resin can be obtained by modifying a base epoxy resin and a fatty acid by heating and reacting in the presence of a catalyst if necessary.

Examples of the isocyanate compound which can be used as a modifier of the base epoxy resin to obtain the urethane-modified epoxy resin include aliphatic diisocyanates such as lysine diisocyanate, hexamethylene diisocyanate, and trimethylhexane diisocyanate; hydrogenated xylylene diisocyanate; Cycloaliphatic diisocyanates such as isophorone diisocyanate, methylcyclohexane-2,4 (or 2,6) -diisocyanate, 4,4'-methylenebis (cyclohexylisocyanate), and 1,3- (isocyanatomethyl) cyclohexane; tolylene diisocyanate , Xylylene diisocyanate, aromatic diisocyanates such as diphenylmethane diisocyanate; trivalent such as lysine triisocyanate The organic polyisocyanate itself such as the above polyisocyanate, or an adduct of each of these organic polyisocyanates with a polyhydric alcohol, a low molecular weight polyester resin or water, or a cyclized polymer of each organic diisocyanate as described above (For example, isocyanurate) and biuret type adduct. These can be used alone or in combination of two or more.

The epoxy resin component (A) may be composed of at least one of an oil-modified epoxy resin and a urethane-modified epoxy resin, or may be a mixture of the modified epoxy resin and another epoxy resin. It may be.

The other epoxy resin is an epoxy resin other than the oil-modified epoxy resin and the urethane-modified epoxy resin. Specific examples thereof include the epoxy resins exemplified as the base epoxy resin and the alkylphenol-modified epoxy resin. Can be mentioned.

The content of the other epoxy resin in the epoxy resin component (A) is within the range of 0 to 50% by weight, preferably 0 to 30% by weight. ing.

Curing Agent (B) The curing agent, which is the component (B) in the composition of the present invention, functions as a curing agent for the epoxy resin component (A), and is itself known as a curing agent for epoxy resins. Can be used without particular limitation.

As the curing agent (B), an amine curing agent which is a compound containing an amino group or two or more groups capable of forming the amino group in one molecule can be suitably used.

Examples of the amine-based curing agent include ethylenediamine, propylenediamine, butylenediamine,
Aliphatic amines such as hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine and diethylaminopropylamine; alicyclic polyamines such as 1,3-bisaminomethylcyclohexane and isophoronediamine; xylylenediamine Aromatic polyamines such as metaxylenediamine, diaminodiphenylmethane, phenylenediamine, etc .; Polyamides, polyamideamines, amine adducts with epoxy compounds, Mannich compounds, Michael adducts, ketimines, aldimines, etc. obtained by modifying these polyamines Can be mentioned.

Aluminum Powder (C) The aluminum powder as the component (C) in the composition of the present invention may be either a leafing type or a non-leafing type. The aluminum powder has an average particle size of 1%.
The range of from 50 to 50 μm, preferably from 5 to 45 μm is suitable for controlling oxygen and water vapor permeability.

In the coating composition of the present invention, the mixing ratio of the epoxy resin component (A) and the curing agent (B) is not particularly limited, but the epoxy group 1 in the epoxy resin component (A) is usually used. When the curing agent (B) is an amine-based curing agent, the total amount of active hydrogen bonded to the amino group (including the generated amino group) in the curing agent is 0.5 to 5 with respect to the equivalent. It is suitable to use at a ratio of 0.0 equivalent, preferably 0.6 to 3.0 equivalent. The aluminum powder (C) is compounded in such a manner that the pigment volume concentration (PVC) of the aluminum powder in the paint solid content is 0.1 to 0.1%.
The range of 7%, preferably 0.5 to 5.0% is suitable from the viewpoint of the balance between the permeability of oxygen and water vapor and the permeability of water vapor.

The coating composition of the present invention contains the epoxy resin component (A), the curing agent (B) and the aluminum powder (C) as essential components. The coating composition of the present invention is an organic solvent type coating. In some cases, the composition further contains an organic solvent.

The organic solvent can be used without any particular limitation as long as it can dissolve or disperse the resin for coating. Specific examples of the organic solvent include, for example, xylene, toluene, VM & P naphtha, mineral spirit, solvent kerosene, aromatic naphtha, solvent naphtha, Solvesso 1
00, Solvesso 150, Solvesso 200 ["Solvesso" is a registered trademark of Esso Oil Co., Ltd.], Swazole 31
0, Swazol 1000, Swazol 1500 ["Swazol" is a registered trademark of Cosmo Oil Co., Ltd.], n-butane, n
Hydrocarbon solvents such as hexane, n-heptane, n-octane, isononane, n-decane, n-dodecane, cyclopentane, cyclohexane, cyclobutane; acetone, methyl ethyl ketone, methyl isobutyl ketone,
Ketones such as cyclohexanone and isophorone; ester solvents such as ethyl acetate, butyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate and diethyl succinate; ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monoethyl Ether alcohol solvents such as ether;
Examples thereof include alcohol solvents such as ethanol, isopropanol, n-butanol and isobutanol. These organic solvents can be used alone or in combination of two or more.

The composition of the present invention may further comprise, in addition to the above-mentioned essential components and the organic solvent, additional resins; pigments such as coloring pigments, extender pigments, and rust-preventive pigments; And additives such as fillers and dispersants.

The above-mentioned additive resin is a resin which does not participate in curing, and examples thereof include an epoxy resin derivative having no epoxy group, a xylene resin, a toluene resin, a ketone resin, a coumarone resin and a petroleum resin. Is used for modifying a coating film. One or more of these additive resins can be blended. These additive resins are used in a range where the ratio of the oil-modified or urethane-modified modified epoxy resin to the total of the epoxy resin (A) and the additive resin is 50% by weight or more, preferably 70% by weight or more. Can be.

The pigments such as coloring pigments, extender pigments, rust-preventive pigments, and the like are mixed with aluminum powder in a total pigment volume concentration (PV
C) is in the range of 3 to 20%, preferably 5 to 15%, from the viewpoint of the balance between oxygen and water vapor permeability and water vapor permeability.

According to the coating composition of the present invention, the cured coating film formed from the coating composition is obtained by subjecting a No. 1 type test piece to a temperature of 23 ± 2 in a tensile test method for plastic films and sheets specified in JIS K7127-1989. ℃, humidity 50 ±
The percentage of tensile elongation at break under conditions of 5% RH and a test speed of 5 mm / min is 100% or more, preferably 140% or more, more preferably 200% or more. This percentage of tensile elongation at break was determined from five or more tests. If the tensile elongation at break is less than 100%, there is a problem that the flexibility of the coating film is not sufficient, and the ability to follow cracks is poor. The tensile elongation at break is represented by the following equation.

Tensile elongation at break (%) = (distance between marked lines at break-distance between marked lines before test) / (distance between marked lines before test) The composition of the present invention is applied to a concrete structure. You. When applying to the concrete structure, it is preferable to apply a sealer to the concrete structure, apply a putty if necessary, and then apply the coating composition of the present invention.
As the sealer, a sealer known per se for concrete structures can be used, and specific examples thereof include an epoxy resin sealer. As the above-mentioned putty, a putty known per se can be used, and specific examples thereof include an epoxy resin-based putty.

As a coating method of the coating composition of the present invention, a general coating method such as brush coating, roller coating and spray coating can be used. The coating amount of the composition of the present invention is not particularly limited, but is generally in the range of about 50 to 600 μm, preferably about 100 to 400 μm in total dry film thickness in 1 to 4 coatings. .

[0039]

EXAMPLES The present invention will be described more specifically with reference to examples. Hereinafter, “parts” and “%” are based on weight unless otherwise specified.

Example 1 "Adeka resin EPUA-86" was placed in a stainless steel container.
(Asahi Denka Kogyo Co., Ltd., urethane-modified epoxy resin, solid content 100%) 100 parts and xylene 38 parts were added and stirred with a stirrer to homogenize, and then titanium white 14. 5 parts and magnesium silicate 2
After adding 3.2 parts, the mixture was stirred at high speed until the degree of dispersion (distribution diagram) became 60 μm or less. Next, 0.5 parts of a leafing aluminum paste (average particle size of aluminum powder: about 20 μm, solid content: 65%) was added thereto with stirring, and stirred and mixed until uniform to obtain a base paint.
Immediately before painting, the total amount of this base paint is added to “ADEKA EH-22”.
0 "(11.4 parts), and xylene was added in an amount of 10% on an external basis, and the mixture was stirred uniformly to obtain a paint, which was used for coating.

Examples 2 to 8 and Comparative Examples 1 to 6 A base paint was obtained in the same manner as in Example 1 except that the composition of the base paint was changed as shown in Table 1 below. Immediately before painting, these base paints are added to the "ADEKA E
H-220 "was blended in the amount shown in Table 1 below, and xylene was added in an amount of 10% and stirred uniformly to obtain a paint, which was used for coating.

The notes in Table 1 below have the following meanings.

(* 1) Epicoat 872-X75: a dimer acid-modified epoxy resin solution manufactured by Yuka Shell Epoxy Co., Ltd., solid content: about 75%.

(* 2) Epicoat 1001-70: Bisphenol A type epoxy resin solution, manufactured by Yuka Shell Epoxy Co., Ltd., solid content: about 70%.

Preparation of Test Piece Preparation of Test Piece A: Release paper and Japanese paper (those having a groove content of 60% or more and having a thickness of about 100 μm) were placed on a glass plate, and the above Examples 1 to 8 and Each of the coating compositions obtained in Comparative Examples 1 to 6 was applied twice with a brush at intervals of 24 hours so that the dry film thickness was about 150 μm / one time, at 20 ± 3 ° C. and a humidity of 6
Cured for 28 days in a room of 5 ± 5 RH% and the dry film thickness was about 3
A test piece A having a coating film of 00 μm was prepared. Specimen A is for testing oxygen permeation inhibition and water vapor permeation inhibition.

Preparation of Specimen B: Specimen B was prepared in the same manner as in Specimen A, except that release paper was stretched on the glass plate but Japanese paper was not stretched.
Test piece B is for the elongation test of the coating film.

Various tests were performed on the performances of the coating compositions obtained in Examples 1 to 8 and Comparative Examples 1 to 6 based on the following test methods. The test results are shown in Table 1 below.

Test method (1) Elongation of coating film: The coating film was peeled off from the test piece B obtained by the above-mentioned method for preparing the test piece B, and the test piece was subjected to JIS K 712.
The test was performed based on the tensile test method for plastic films and sheets specified in 7-1989. A sample coating film having the shape of a No. 1 test piece (width 10 mm, total length 200 mm) was prepared, and the sample coating film was set so that the distance between the chucks was 150 mm.
3 ± 2 ℃, humidity 50 ± 5% RH, tensile test speed 5mm
The tensile elongation at break (%) was measured under the condition of / min.

The tensile rupture elongation was evaluated according to the following criteria.

：: tensile elongation at break is 200% or more ○: tensile elongation at break is 140% or more and less than 200% Δ: tensile elongation at break is 100% or more and less than 140% ×: tensile elongation at break is 100% (2) Oxygen permeation inhibiting property: The coating film was peeled off from the test piece A obtained by the preparation of the test piece A, and the coating film was formed with a diameter of 18
The specimen was punched out into a circular shape of mm. This specimen was measured using a Kakenhi type film oxygen permeability meter. For the measurement, an oxygen gas was blown into distilled water at a rate of 200 cc / min, and the current value when the oxygen permeation amount became constant was read. The oxygen permeation amount Q [(mg / cm ² ) was obtained by the following equation. ×
Days] was calculated.

[0051] ^{Q = (7.1627 × i ∞ ×} 10 -3) / A where, i ^∞: measured current value (μA) A: Platinum area of the individual electrode in close contact with the membrane means.

From the value of the oxygen permeation amount Q, the oxygen permeation inhibition was evaluated according to the following criteria.

A: Q is less than 3.0 × 10 ^-2 mg / cm ² · day ○: Q is 3.0 × 10 ^-2 mg / cm ² · day or more and less than 5.0 × 10 ^-2 mg / cm ² · day △: Q: 5.0 × 10 ^-2 mg / cm ² · day or more, less than 8.0 × 10 ^-2 mg / cm ² · day ×: Q: 8.0 × 10 ^-2 mg / cm ² · day or more (3) Water vapor permeation inhibition : The coating film was peeled off from the test piece A obtained by the preparation of the test piece A, and the coating film having a diameter of 6
A test specimen was punched into a circular shape of 5 mm. With respect to this test body, the water vapor transmission rate S was measured at a test temperature of 20 ° C. according to JIS Z0208 by a moisture absorption method. From the value of the amount of permeated water vapor, the water vapor permeation inhibiting property was evaluated according to the following criteria.

◎: S is less than 3.0 mg / cm ² · day ○: S is 3.0 mg / cm ² · day or more and less than 5.0 mg / cm ² · day △: S is 5.0 mg / cm ² · day or more, 8.0 mg / cm ² · day ×: S is 8.0 mg / cm ² · day or more (4) Water vapor permeability: JIS A6203.8.2 (1
996), prepared by the method specified in 996).
Primer (Kansai Paint Co., Ltd., “KC Epo Primer”) is applied to one surface of mortar of 0 mm (surface in contact with the mold).
Was applied once (at a dry application amount of 25 g / m ² ) and twice at 24 hour intervals so that the dry application amount was 200 g / m ² at a time, and the temperature was 20 ± 1. ℃, humidity 65
The test piece was cured for 28 days under the condition of ± 5% RH.

Next, JIS A6203.8.15 (1)
996), the inner diameter is 68 m.
m, outer diameter 70mm, height 30mm, diameter 56.5 on top
The test piece was bonded to a rust-proof aluminum upper cylinder having a hole of 1 mm with an epoxy resin adhesive, and the hole was closed with the test piece. Next, the upper cylinder to which the above-described test piece was adhered was inserted into a lower cylindrical container made of rust-proofed aluminum having an inner diameter of 70 mm and a height of 15 mm and provided with a water inlet, and the periphery was sealed with aluminum tape to close the gap. Thereafter, about 20 cc of distilled water was poured from the water inlet, and the water inlet was sealed to obtain a test sample. This test specimen was subjected to a temperature of 20 ± 1 ° C. and a humidity of 65 ±
The sample was allowed to stand at 5% RH for 240 hours, during which time the mass of the specimen was measured at intervals of 0.1 mg every 24 hours, and the moisture release Q (g) was determined by the following equation.

Q = W _n −W _{n + 1} where, W _n : mass of the specimen at the n-th mass measurement (g) W _{n + 1} : mass of the specimen at the n + 1-th mass measurement (g) When the change in the amount of released moisture was within 5% between two successive measurement intervals, the change was determined by the following equation.

M = Q _i / (A · t) Here, M: moisture permeability [g / (m ² · day)] Q _i : moisture release when the change in moisture release amount is within 5% A: Moisture permeability area (0.0025 m ² ) t: Time interval of measurement (1 day) Water vapor permeability was evaluated from the value of the moisture permeability M according to the following criteria. ◎: M is less than 0.8 mg / cm ²・ day ○: M is 0.5 mg / cm ²・ day or more and less than 0.8 mg / cm ²・ day △: M is 0.2 mg / cm ²・ day or more, 0.5 mg / cm Less than ² days ×: M is 0.2 mg / cm ² days or more.

(5) Crack followability: Japan Highway Public Corporation Test Laboratory Test Laboratory Technical Document No. 121 Materials Construction Material (No. 1) The crack followability test of concrete protection works is performed. However, after painting, 20 ± 1 ℃, humidity 65 ± 5
% RH for 28 days (hereinafter abbreviated as "standard curing") in a room at 20 ° C and -20 ° C.
The test was conducted in a room at a temperature of ℃ and evaluated according to the following criteria. -20
When the test was conducted in a room at ℃, the test was carried out after standing for one day in a room at -20 ° C.

◎: Crack following ability is 0.8 mm or more ○: Crack following property is 0.4 mm or more and less than 0.8 mm Δ: Crack following property is 0.2 mm or more and less than 0.4 mm ×: Crack following property is 0.2 mm Less than.

(6) Adhesion after standard curing: Japan Highway Public Corporation Testing Laboratory Test Laboratory Technical Document No. 121 Material Construction Material (No. 1) Applied according to the adhesion test after standard curing of concrete protection works The adhesion was measured and evaluated according to the following criteria. ◎: Adhesive force of 10 kgf / cm ² or more ○: Adhesive force of 3 kgf / cm ² or more, less than 10 kgf / cm ² ×: Adhesive force of less than 3 kgf / cm ²

(7) Adhesion after alkali resistance test: Japan Highway Public Corporation Testing Laboratory Test Laboratory Technical Document No. 121 Material Construction Material (No. 1) According to adhesion test after alkali resistance test of concrete protection work . ◎: Adhesive force of 10 kgf / cm ² or more ○: Adhesive force of 3 kgf / cm ² or more, less than 10 kgf / cm ² ×: Adhesive force of less than 3 kgf / cm ²

[0062]

[Table 1]

[0063]

The coating film obtained from the coating composition of the present invention is excellent in elongation at break of the coating film, oxygen permeation prevention, balance between water vapor transmission and prevention, crack followability and adhesion, and is excellent in concrete. It is possible to perform excellent prevention of deterioration due to salt damage, alkali-aggregate reaction, neutralization, and the like of the structure, and the combined deterioration thereof.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C04B 41/71 C04B 41/71 C08G 59/50 C08G 59/50 C09D 5/10 C09D 5/10 F term (reference) 4D075 AE03 CA33 CA42 DB12 DC05 EA39 EB33 EB56 EC10 EC37 4G028 CA01 CB06 CC00 FA01 FA03 4J036 AA04 AB01 AB02 AB03 AB07 AB09 AB10 AD04 AD08 AD09 AF07 AF08 AG06 AG07 AH10 AH15 AJ18 CA16 CA23 CA30 CB20 CD21 DC23 DC02 DC02 KA01 4J038 DB361 DB381 DH002 GA09 HA066 KA03 KA20 NA04 NA08 PB05 PC04

Claims (4)

[Claims] 1. An epoxy resin component having one or more epoxy groups in one molecule containing (A) at least one modified epoxy resin selected from an oil-modified epoxy resin and a urethane-modified epoxy resin, and (B) a curing agent And (C) a coating containing aluminum powder having an average particle diameter of 1 to 50 μm, wherein aluminum powder (C) is contained in the solid content of the coating.
Is contained in a pigment volume concentration of 0.1 to 7%, and a cured coating film formed from the coating material is JIS K 7127-198.
Concrete structure characterized by having a percentage of tensile elongation at break of 100% or more when the test speed of a No. 1 type test piece according to the tensile test method for plastic films and sheets specified in 9 is 5 mm / min. Paint composition for painting. 2. In the epoxy resin component (A), the content of at least one modified epoxy resin selected from an oil-modified epoxy resin and a urethane-modified epoxy resin is 50.
The coating composition according to claim 1, wherein the coating composition is not less than% by weight. 3. The coating composition according to claim 1, wherein the curing agent (B) is a modified polyamidoamine. 4. A concrete structure, characterized in that a concrete structure is coated with a sealer, putty is coated as required, and then the coating composition according to any one of claims 1 to 3 is coated. How to paint things.