JP2001300417A - Repairing coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repairing coating method capable of forming a coating film, which is good in coating film performance such as adhesiveness or the like even if it is applied without pretreatment, on a deteriorated highly corrosion-proof paint coating film comprising a tar/epoxy resin paint or the like. SOLUTION: In the repairing coating method, an epoxy/polyamine resin paint containing an epoxy resin having one or more epoxy group in one molecule thereof and an amine type curing agent as resin components is applied to a coating film with a moisture content of 0.3-5 parts by weight selected from among a tar/epoxy resin coating film, a tar/urethane resin coating film, a modified epoxy resin coating film, a modified urethane resin coating film, an epoxy/polyamine resin coating film and an epoxy/urethane resin coating film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deteriorated coating of a coating formed from a tar epoxy resin coating, a tar urethane resin coating, a modified epoxy resin coating, a modified urethane resin coating, an epoxy-polyamine resin coating or an epoxy urethane resin coating. The present invention relates to a repair coating method capable of forming a coating film having good performance even when coating is performed on a film surface without removing a deteriorated layer on the surface of the deteriorated coating film.

[0002]

2. Description of the Related Art Conventionally, large steel structures such as ships and bridges exposed to a corrosive environment are required to be protected from corrosion.
High corrosion-resistant paints such as tar epoxy resin paint, tar urethane resin paint, modified epoxy resin paint, modified urethane resin paint, epoxy-polyamine resin paint, epoxy urethane resin paint, etc.
Ballast tanks, cargo tanks, outer panels, etc .; painted on bridge outer panels, outer girders, inner girders, etc.

[0003] Since the construction and construction period of these large steel structures is usually as long as 3 to 24 months, tar epoxy resin paint, tar urethane resin paint, modified epoxy resin paint,
A coating film coated with a modified urethane resin coating, an epoxy-polyamine resin coating, or an epoxy urethane resin coating is usually exposed outdoors for about 1 to 12 months.

[0004] Generally, these resin-based coating films have poor weather resistance, and when exposed to the outdoors for a long period of time, discoloration, gloss,
Causes deterioration of the coating such as chalking. This deterioration is particularly remarkable in a coating film coated with a tar epoxy resin paint or a tar urethane resin paint.

[0005] When the above-mentioned resin-based paint is applied and a given paint is applied as it is to the surface of the paint film which has been exposed to the outdoors for a long time during construction, construction or operation and has deteriorated, the paint film and the deteriorated paint film are obtained. Is extremely poor, causing a problem that cracking, peeling and the like often occur during construction, construction, or operation.

[0006] As a countermeasure, when a paint is applied on the above-mentioned deteriorated coating film, the salt is removed by a high-pressure water washing machine, and then blast treatment or removal treatment using a power tool, a hand tool, a high-pressure water washing machine, or the like is performed. A predetermined paint is applied after the degraded layer on the surface of the resin-based coating film is removed and sufficiently dried. However, the removal of the deteriorated layer requires a great deal of labor and cost, and the labor and time for drying the moisture of the deteriorated coating film. Therefore, without such a removing step, cracks, There is a strong demand for the development of a paint and a coating method capable of forming a coating film having good anticorrosion properties without causing problems such as peeling.

[0007] In addition to the deterioration caused by exposure, the resin-based coating film is also deteriorated by immersion, and similarly to the case of deterioration by exposure, the coating film deteriorated by immersion is
When a predetermined paint is applied without treating the deteriorated coating film, the adhesion between the paint film and the deteriorated coating film is extremely poor, so that cracks, peeling, etc. frequently occur during construction, construction or in service. There is a problem.

An object of the present invention is to provide a tar epoxy resin paint, a tar urethane resin paint, a modified epoxy resin paint,
Good coating performance, such as adhesion, even if the modified urethane resin coating, epoxy-polyamine resin coating, or epoxy urethane resin coating is applied to a deteriorated coating film without removing the degraded layer of the deteriorated coating film It is an object of the present invention to provide a repair coating method capable of forming an excellent coating film.

[0009]

Means for Solving the Problems The present inventors have developed a resin component (epoxy resin, curing agent, and other combined resin) in a coating film due to the deterioration phenomenon of the coating film due to the above-mentioned outdoor exposure or immersion.
Note that a part of the deteriorated, carboxyl groups are generated, so that the carboxyl group of this deteriorated coating film and a part of the components of the paint applied on the deteriorated coating film are chemically bonded. We thought that it would be possible to improve the adhesion between the coatings, and as a result of various studies, surprisingly, the epoxy resin was placed on the deteriorated coating whose moisture content in the coating was within the specified range. -It has been found that the above object can be achieved by applying an amine curing agent-based coating composition, and the present invention has been completed.

[0010] Thus, the present invention is directed to coatings selected from tar epoxy resin coatings, tar urethane resin coatings, modified epoxy resin coatings, modified urethane resin coatings, epoxy-polyamine resin coatings and epoxy urethane resin coatings. Epoxy-polyamine containing, as a resin component, an epoxy resin having at least one epoxy group in one molecule and an amine-based curing agent on a deteriorated coating film having a moisture content of 0.3 to 5% by weight in the film. An object of the present invention is to provide a repair coating method characterized by applying a resin paint.

Hereinafter, the repair coating method of the present invention will be described in more detail.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The repair coating method of the present invention is characterized in that an epoxy-polyamine resin paint is applied to the surface of a deteriorated coating film of a specific type and a predetermined moisture content.

In the repair coating method of the present invention, the deteriorated coating film to be repaired includes a tar epoxy resin paint, a tar urethane resin paint, a modified epoxy resin paint, a modified urethane resin paint, an epoxy-polyamine resin paint, and an epoxy urethane resin. A paint film formed by applying a paint selected from paints is a paint film that has been deteriorated by being exposed to various environments.

The above-mentioned tar epoxy resin paint, tar urethane resin paint, modified epoxy resin paint, modified urethane resin paint, epoxy-polyamine resin paint and epoxy urethane resin paint are all used for large steel structures such as ships, bridges and steel towers. It can be a paint known per se in the field of painting. As a tar epoxy resin paint, for example,
A coating material containing an epoxy resin and tar as a resin component can be given. Examples of the tar urethane resin paint include a paint containing a urethane resin and tar as a resin component. Examples of the modified epoxy resin paint include an epoxy resin and a modified resin (xylene resin, toluene resin, ketone resin, coumarone resin, petroleum resin, phenol resin, dicyclopentadiene resin;
Paints containing coal dry distillation residues such as tar, pitch and swollen coal; and petroleum distillation residues such as asphalt) as resin components. Examples of the modified urethane resin paint include a paint containing a urethane resin and the modified resin as a resin component. Examples of the epoxy-polyamine resin paint include a paint containing an epoxy resin and a polyamine curing agent as resin components. As epoxy urethane resin paint,
For example, a coating material containing a resin obtained by reacting a poly- or mono-isocyanate compound with an epoxy resin as a resin component can be used.

The surface of the coating film coated with a paint selected from the above-mentioned tar epoxy resin paint, tar urethane resin paint, modified epoxy resin paint, modified urethane resin paint, epoxy-polyamine resin paint and epoxy urethane resin paint is exposed to light, It is easily deteriorated by water and the like. For example, a coating film from a tar epoxy resin paint, a tar urethane resin paint, a modified epoxy resin paint or a modified urethane resin paint usually has a discoloration, gloss, chalk, etc. Deterioration progresses considerably, and a coating film from an epoxy-polyamine resin paint or an epoxy urethane resin paint,
Usually, the deterioration progresses considerably after about one year of exposure. In addition, carboxyl groups are generated on the surface of these coating films due to deterioration.

When applying the epoxy-polyamine resin paint as a repair paint according to the method of the present invention, the water content of the deteriorated paint film is 0.3 to 5% by weight, preferably 0.6% by weight. Desirably, it is in the range of ３3% by weight. If the moisture content of the deteriorated coating film is within the above range, moisture may be condensed on the coating film surface, but it is desirable that the coating film surface is free of water that has been released visually, Coating surface resistance is 100KΩ to 100MΩ, especially 500
It is desirable to be within the range of KΩ to 50 MΩ.

In the present specification, "moisture content in coating film"
Means the water content when the coating film having no water on the coating film surface is measured by the Karl Fischer method.
In addition, when there is free moisture on the surface of the coating film to be measured, after removing the free moisture by wiping the released moisture on the coating film surface with a paper or cloth having excellent water absorption, Immediately, the water content of the coating film is measured by the Karl Fischer method.

In the repair coating method of the present invention, the repair paint can be applied on the deteriorated coating film as long as its moisture content is in the range of 0.3 to 5% by weight. The deteriorated coating film is (1) one that has been subjected to water washing and a process of removing the deteriorated layer, (2) one that has been washed with water but has not been subjected to the removal treatment of the deteriorated layer, and (3) one that has been washed with water and the deteriorated layer has been removed. Any of those that have not been subjected to the removal treatment may be used. Among them, the deteriorated coating film is preferably the above-mentioned deteriorated coating film (2) or (3) that has not been subjected to the removal treatment of the deteriorated layer. This is preferable from the viewpoint of reducing the number of steps and labor.

Next, an epoxy-polyamine resin paint containing an epoxy resin and an amine-based curing agent as a resin component, which is applied on the deteriorated coating film according to the repair coating method of the present invention, will be described.

Epoxy resin The epoxy resin, which is a resin component of the epoxy-polyamine resin paint used in the method of the present invention, has at least one epoxy group in one molecule, preferably at least two, more preferably an average. A resin having from 2 to 5 resins having a number average molecular weight of generally from about 250 to about 3,000.
0, preferably in the range of about 360 to about 1,000,
Epoxy equivalents generally in the range of about 80 to about 1,000, preferably about 180 to about 500 are suitable.

The epoxy resin includes, for example, glycidyl ether type epoxy resin, glycidyl ester type epoxy resin, other glycidyl type epoxy resin, alicyclic epoxy resin; these epoxy resins are at least one selected from alkylphenols and fatty acids. And epoxyphenol-introduced alkylphenols or alkylphenol novolak resins obtained by reacting an alkylphenol or alkylphenol novolak resin with epichlorohydrin.

The glycidyl ether type epoxy resin includes, 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 alkylene oxide. Examples of the polyhydric alcohol include dihydric alcohols such as ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, neopentyl glycol, butylene glycol, and hexanediol; and trihydric alcohols such as glycerin, trimethylolethane, and trimethylolpropane. Pentaerythritol, diglycerin, sorbitol and the like. 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 polyhydric phenol, cresol-type polyhydric phenol and the like can be mentioned.

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

Examples of the other glycidyl-type epoxy resins include tetraglycidylaminodiphenylmethane, triglycidyl isocyanurate and the like.

The alicyclic 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, Epode GT300 (trade name, manufactured by Daicel Chemical Industries, Ltd., trifunctional alicyclic epoxy resin) , Eporide GT400 (trade name, 4-functional alicyclic epoxy resin, manufactured by Daicel Chemical Industries, Ltd.), EH
PE (manufactured by Daicel Chemical Industries, Ltd., trade name, polyfunctional alicyclic epoxy resin) and the like can be mentioned.

The modified epoxy resin includes an unmodified epoxy resin selected from the above-mentioned glycidyl ether type epoxy resin, glycidyl ester type epoxy resin, other glycidyl ether type epoxy resin and alicyclic epoxy resin, alkyl phenol, fatty acid , Phosphoric acid, epoxy resins modified by reacting with a modifying agent such as an acrylic resin. The unmodified epoxy resin generally has an average of about 250 or less, particularly 180 to
Those having an epoxy equivalent of 200 are preferred.

As the alkylphenol which can be used as the above modifier, a phenol having an alkyl group having about 2 to 18 carbon atoms is preferable, and specific examples thereof include para-t-butylphenol, paraoctylphenol and nonylphenol. . Further, as the fatty acid that can be used as the above-mentioned denaturing agent, a drying oil fatty acid and a semi-dry oil fatty acid are preferable, and specific examples thereof include:
Linseed oil fatty acid, safflower oil fatty acid, soybean oil fatty acid,
Sesame oil fatty acid, eno oil oil fatty acid, hemp oil fatty acid, grape kernel oil fatty acid, kiri oil fatty acid, corn oil fatty acid, sunflower oil fatty acid, cottonseed oil fatty acid, walnut oil fatty acid, rubber seed oil fatty acid, Eucommia oil fatty acid, fish oil fatty acid, hediene fatty acid, Tall oil fatty acids and dehydrated castor oil fatty acids can be mentioned. The above modifiers, alkylphenols and fatty acids, can be used alone or in combination of two or more.

As the epoxy resin which is a resin component of the epoxy-polyamine resin paint used in the method of the present invention, an aromatic epoxy resin having a glycidyl ether group is particularly preferable.

Amine-based curing agent The amine-based curing agent, which is a resin component of the epoxy-polyamine resin-based coating used in the method of the present invention, functions as a curing agent for the above-mentioned epoxy resin. Alternatively, it can be a compound containing at least two groups capable of forming the amino group when contacted with water.

Examples of the amine curing agent include ethylene diamine, propylene diamine, butylene diamine,
Aliphatic polyamines such as hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine and diethylaminopropylamine; alicyclic polyamines such as 1,3-bisaminomethylcyclohexane and isophoronediamine; xylylenediamine Aromatic polyamines such as amine, metaxylenediamine, diaminodiphenylmethane, and phenylenediamine; modified products of these polyamines, for example, polyamides, polyamideamines, amine adducts with epoxy compounds, Mannich compounds, Michael adducts, ketimines, aldimines And the like. As the epoxy compound constituting the adduct, a glycidyl ether type epoxy resin having a number average molecular weight of 300 to 1,000 can be suitably used. Among these, polyamides of polyamines selected from diethylenetriamine, triethylenetetramine, tetraethylenepentamine and metaxylenediamine; and Mannich compounds of metaxylenediamine are preferred.

The mixing ratio of the epoxy resin and the amine curing agent in the epoxy-polyamine resin paint is not particularly limited, but usually, one equivalent of the epoxy group in the epoxy resin is added to the amine. The total amount of active hydrogen bonded to the amino group (including the generated amino group) in the system curing agent is 0.5 to 5 equivalents, preferably 0.6 to 5 equivalents.
It is preferable to use at a ratio such that it becomes 3 to 3 equivalents. Epoxy-polyamine resin-based paint The epoxy-polyamine resin-based paint used in the present invention is an organic solvent-based or solvent-free paint containing the above-described epoxy resin and amine-based curing agent as resin components. In the case of an organic solvent type paint, an organic solvent is further contained in addition to these essential components.

The organic solvent can be used without any particular limitation as long as it can dissolve or disperse the epoxy resin and the amine-based curing agent. Specific examples of the organic solvent include, for example, xylene, toluene, VM & P naphtha , Mineral Spirit, Solvent Kerosene, Aromatic Naphtha, Solvent Naphtha, Solvesso 100, Solvesso 15
0, Solvesso 200 [“Solvesso” is a registered trademark of Esso Oil Co., Ltd.], Swazole 310, Swazole 100
0, Swazol 1500 ["Swazol" is a registered trademark of Cosmo Oil Co., Ltd.], n-butane, n-hexane, n-heptane, n-octane, isononane, n-decane, n-dodecane, cyclopentane, cyclohexane, cyclobutane, etc. Hydrocarbon solvents; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and isophorone; ester solvents such as ethyl acetate, butyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, and diethyl succinate; Ether alcohol solvents such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether and diethylene glycol monoethyl ether; ethanol, isopropanol, n-butano Le, such as alcohol solvents such as isobutanol and the like. These organic solvents can be used alone or in combination of two or more.

[0033] The epoxy-polyamine resin paint used in the method of the present invention may further contain, if necessary, other resins in addition to the epoxy resin, the amine-based curing agent, and an organic solvent blended as required. Metal powders such as zinc powder and aluminum powder; pigments such as coloring pigments, extender pigments, rust-preventive pigments; defoamers, leveling agents, thickeners;
It may contain additives such as a plasticizer, a filler, and a dispersant.

Examples of the other resins include resins which are usually blended in paints, such as modified epoxy resins having no epoxy group, xylene resins, toluene resins, ketone resins, and the like.
Coumarone resin, petroleum resin, phenolic resin, dicyclopentadiene resin; coal dry distillation residues such as tar, pitch, and swelling coal; and petroleum distillation residues such as asphalt. Used for These other resins may be used alone or in combination of two or more.

The modified epoxy resin having no epoxy group is a resin which does not contain an epoxy group involved in curing derived from the epoxy resin and includes, for example, urethane-modified epoxy resin, amine-modified epoxy resin, dimer-modified epoxy resin and the like. Can be mentioned. Among them, examples of the urethane-modified epoxy resin include those obtained by further reacting a poly- or mono-isocyanate compound with an amine-added epoxy resin obtained by reacting an amine with an epoxy resin. Further, as the above xylene resin, toluene resin, ketone resin, cumarone resin, petroleum resin, phenol resin, dicyclopentadiene resin; coal, carbonization residue such as tar, pitch, swelling carbon; and petroleum distillation residue such as asphalt, respectively, Solid at room temperature,
Those having a melting point of 60 ° C. or higher, preferably 70 to 140 ° C. can be suitably used.

Repair coating The above-mentioned coating of the deteriorated coating film with the epoxy-polyamine resin paint is performed by a general method such as brush coating, roller coating, spray coating, electrostatic coating, and various coater coatings. Can be.

In the method of the present invention, the amount of the above-mentioned epoxy-polyamine resin paint applied to the deteriorated paint film containing water at the above-mentioned predetermined water content is particularly limited. Instead, it can be changed according to the type and condition of the surface to be coated, but generally, in the case of a clear paint, the cured film thickness is about 5 to about 100 μm, preferably about 10 μm.
About 50 μm, and in the case of a paint containing a pigment, about 10 to about 500 μm, preferably about 40 to about 250
A range of μm is appropriate.

The formed coating film is usually cured by leaving it at room temperature, but may be cured by heating to a temperature of up to about 80 ° C., depending on the kind of amine curing agent used. It can also be done.

If necessary, a top coat can be applied on the coating film which has been coated with the epoxy-polyamine resin paint and dried. As this top coat, there is no particular limitation, and a known top coat can be used, such as an alkyd resin, a chlorinated rubber, an epoxy resin, a silicon alkyd resin, a urethane resin, and a silicone acrylic resin. And a fluororesin-based paint can be used.

When the above-mentioned epoxy-polyamine resin paint is applied on the deteriorated paint film containing a predetermined amount of water in the above-mentioned paint film, the surface treatment of the deteriorated paint film (blast treatment or various types of Even if no removal treatment is performed, good adhesion can be obtained, and a coating film having a good coating state can be formed without causing cracking, peeling, or the like during construction, construction, or in service.

In the method of the present invention, the reason why the epoxy-polyamine resin-based paint exhibits excellent adhesion to a deteriorated coating film is not exactly known, but the present inventors have, for example, the following reaction formula:

[0042]

Embedded image

(Wherein R represents a residue of an amine-based curing agent, and R ¹ and R ² are the same or different and each represent a hydrogen atom or a hydrocarbon group such as an alkyl group or an allyl group). The water in the coating film acts as a catalyst for a salt-forming reaction between the carboxyl group of the deteriorated coating film and the amino group of the amine-based curing agent in the epoxy-polyamine resin-based coating material applied thereon, and the salt-forming reaction is carried out. It is presumed that this is because the salt formation contributes to the improvement of adhesion.

[0044]

The present invention will be described more specifically with reference to the following examples. Note that “parts” and “%” are based on weight unless otherwise specified.

Preparation method of coated substrate A tar epoxy resin paint (manufactured by Kansai Paint Co., Ltd., trade name "Eposeal 6000PS") and a tar urethane resin paint (Kansai Paint Co., Ltd., trade name "Eposeal 6000PW") "), Modified epoxy resin paint (Kansai Paint Co., Ltd., trade name" Epomarine EX2 ")
1)), modified urethane resin paint (Kansai Paint Co., Ltd.)
Epoxy-polyamine resin paint (Kansai Paint Co., Ltd., trade name "Epomarin EX500") and epoxy urethane resin paint (Kansai Paint Co., Ltd., trade name "Epomarin EX60")
0W "), and dried for 7 days in a room at a temperature of 20 ° C. and a humidity of 65% RH to prepare a plurality of coated plates for each paint. These coated plates were exposed outdoors on the beach for 30 days, immersed in tap water for 10 days, and then pulled up. Then, the lifted coated plate was dried for an arbitrary drying time to prepare a coated substrate having coating films having various water contents.
The water content in the coating film of the coated substrate was measured by the Karl Fischer method.

Example 1 A tar epoxy resin paint (manufactured by Kansai Paint Co., Ltd., manufactured by Kansai Paint Co., Ltd.) The name "Eposeal 6000PS", a bisphenol A type epoxy resin having one or more epoxy groups in a molecule, a polyamidoamine resin and tar as resin components), a modified epoxy resin paint (manufactured by Kansai Paint Co., Ltd.)
Trade name "Epomarin EX21", bisphenol A type epoxy resin having one or more epoxy groups in one molecule, polyamide, Mannich compound and petroleum resin as resin components) and epoxy resin paint (manufactured by Kansai Paint Co., Ltd.) Each product having a trade name of “Epomarin EX500”, a bisphenol A type epoxy resin having one or more epoxy groups in one molecule, a polyamidoamine resin, an amine adduct of an epoxy compound and a Mannich compound as resin components) of about 2000 mPa · s (millipascal-second), and applied by airless spray method so that the dry film thickness is about 100 μm.
It was dried in a room having a humidity of 65% RH for 7 days to obtain three types of coated plates.

Examples 2 to 15 and Comparative Examples 1 to 3 Various coatings were applied in the same manner as in Example 1 on the coating film of the coating substrate having various moisture contents obtained by the above-mentioned method for preparing the coating substrate. Each coated plate was obtained.

Various tests were performed on the coated plates obtained in Examples 1 to 15 and Comparative Examples 1 to 3 based on the following test methods. The test results are shown in Table 1 below.

Test Method Adhesion: Six vertical and horizontal scratches, each reaching the substrate with a knife, were made on the coated plate by means of a knife to make a square having 25 squares of 5 mm square. Then, after the cellophane adhesive tape was brought into close contact with the gobang portion, the tape was instantaneously peeled off, and the tape was not peeled off and the number of squares remaining on the coated plate was evaluated according to the following criteria.

◎: All 25 squares remain without peeling. 数: The number of remaining squares is 24 to 20. Δ: The number of remaining squares is 19 to 10 ×: Residual. The number of squares to be performed is 9 or less.

Repelling resistance: The degree of repelling of the paint film on the coated plate was visually evaluated according to the following criteria.

：: No repelling is observed. Δ: Repelling is slightly observed. X: Repelling is considerably observed.

Moisture resistance: The coated plate was allowed to stand in a blister box at 50 ° C. and a relative humidity of 95% RH or more for 30 days, and the degree of blistering of the coated film was visually evaluated according to the following criteria.

：: No swelling of the coating film was observed. Δ: Slight swelling of the coating film was observed. ×: Swelling of the coating film was considerably observed.

[0055]

[Table 1]

[0056]

[Table 2]

[0057]

As is clear from the results shown in Table 1, according to the repair coating method of the present invention, tar epoxy resin paint, tar urethane resin paint, modified epoxy resin paint, modified urethane resin paint, epoxy-polyamine resin paint Or, even if the repair paint is applied on the deteriorated paint film of the epoxy urethane resin paint without removing the deteriorated layer of the deteriorated paint film, the conventional problem of adhesion deterioration etc. It is possible to form a coating film having good appearance, appearance and coating film performance. According to the repair coating method of the present invention, the process of removing the deteriorated coating film can be omitted, so that much labor and cost required for the process of removing the deteriorated layer can be saved.

Continuation of the front page F term (reference) 4D075 CA13 CA33 CA47 DA27 DB02 DB32 DB46 DB47 DB50 DC05 DC08 EB09 EB12 EB32 EB33 EB39 EB45 4J038 BA241 BA242 BA242 CM021 CM022 CM031 CM032 CR011 CR012 DA041 DA042 DA101 DA102 DB031 DB03 DB06 DB01 DB091 DB092 DB131 DB132 DB151 DB152 DB301 DB302 EA011 EA012 JB04 JB05 JB06 JB13 JB18 KA03 KA06 NA03 NA12 NA24 NA27 PA18 PB05 PB12 PC02 PC08

Claims (4)

[Claims] 1. A film selected from a tar epoxy resin coating, a tar urethane resin coating, a modified epoxy resin coating, a modified urethane resin coating, an epoxy-polyamine resin coating, and an epoxy urethane resin coating, and Content is 0.
An epoxy-polyamine resin paint containing, as a resin component, an epoxy resin having at least one epoxy group in one molecule and an amine-based curing agent as a resin component, on the degraded coating film of 3 to 5% by weight. And repair painting method. 2. The repair coating method according to claim 1, wherein the water content of the deteriorated coating film is 0.6 to 3% by weight. 3. The repair coating method according to claim 1, wherein an epoxy-polyamine resin paint is applied on the deteriorated coating film without performing a process of removing the deteriorated layer on the surface of the deteriorated coating film. . 4. An epoxy-polyamine resin-based coating material further comprising a modified epoxy resin having no epoxy group, a xylene resin, a toluene resin, a ketone resin as a resin component.
4. A paint containing at least one resin selected from the group consisting of coumarone resin, petroleum resin, phenol resin, dicyclopentadiene resin, tar, pitch, swollen carbon and asphalt. Repair painting method described.