JPH0711175A - Antifouling coating composition - Google Patents

Abstract

PURPOSE:To obtain an antifouling coating composition which is not dangerous unlike an organotin copolymer, has good hydrolyzability, does not undergo thickening and gelation even when kneaded together with a copper compound, and can form a coating film of excellent surface smoothness. CONSTITUTION:This coating composition comprises a polymer obtained by polymerizing at least one unsaturated acid anhydride represented by the formula (wherein R<1> and R<2> are each hydrogen, chlorine, methyl or ethyl) with at least another copolymerizable unsaturated monomer, a benzothiazole derivative, a copper compound antifouling agent and an aliphatic amide dispersant/ antisagging agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for antifouling paint for the purpose of preventing adherence of aquatic organisms to underwater structures such as ships, fishing nets and drainage channels.

[0002]

2. Description of the Related Art A large number of marine organisms such as barnacles, ascidians, serpras, blue mussels, and sea lions inhabit seawater. When structures such as ships, fishing nets, drainage channels, etc. are installed or put in service in the sea, marine organisms adhere and grow to cause various damages. For example, if marine organisms adhere to the bottom of the ship, frictional resistance with seawater increases, causing a decrease in navigation speed, and fuel consumption increases to maintain a constant speed, which is not economically preferable. In addition, when marine organisms attach to a fishing net for aquaculture, the net may be closed and the seafood may be killed.

Conventionally, in order to prevent marine organisms from adhering to such marine structures, an antifouling paint containing a homopolymer or copolymer of an organotin-containing unsaturated monomer as a resin component (Japanese Patent Publication No. 40-21426, Japanese Patent Publication No. 44-9579, Japanese Patent Publication No. 46-13392, Japanese Patent Publication No. 49-20491, Japanese Patent Publication 51-1
1647, Japanese Patent Publication No. 51-12049, Japanese Patent Publication No. 52-48170, etc.). The organic tin portion of these polymers is hydrolyzed by seawater (pH 8.0 to 8.3),
Not only does organotin act as an antifouling agent, but the surface of the polymer solubilized in seawater is gradually eroded by the moving seawater, exposing a new coating film surface, thus exhibiting a long-term stable antifouling effect. To be done. However, organotin released from these paints into seawater is not very easy to decompose and accumulates not only in marine organisms but also in the human body due to the food chain, causing damage such as malformation, so it is extremely dangerous, The use of organotin compounds has become limited.

It has been desired to develop a resin for an antifouling paint which can achieve stable antifouling property for a long period of time in place of these highly dangerous organotin resins. Ideally, the same hydrolysis type as the organic tin resin is preferable, but a proposal using a hydrophilic or water-repellent resin has also been made (JP-A-62-29076).
No. 8, JP-A-62-13471, JP-A-58-180565, JP-A-57-67672). However, it is difficult to realize long-term stable antifouling property only by the properties of hydrophilicity and water repellency. Therefore, resins having various special carboxylic acid esters in the side chains as hydrolyzable ones have been proposed (Tokusho Sho 60-500).
No. 452, JP 2-69576 JP, JP 63-215780 JP, JP 55-39271 JP, JP 62-57464 JP,
Japanese Patent Publication No. 61-3830), but the effect is not completely satisfactory.

On the other hand, JP-A-2-99567 proposes to use a copolymer of a maleic anhydride derivative for this purpose. Unlike the organotin resin, this copolymer is not toxic per se and is expected to have excellent hydrolyzability. However, when it is used for an antifouling paint, it has a fatal drawback that it causes thickening-gelation by kneading with a copper compound currently used as a poison.

[0006]

DISCLOSURE OF THE INVENTION The present invention does not have the dangers of organotin copolymers and exhibits hydrolyzability comparable to this, and further increases the viscosity by kneading with a copper compound. -To provide a composition for an antifouling coating which does not gel and can form a good coating film and at the same time exhibits excellent antifouling property.

[0007]

DISCLOSURE OF THE INVENTION The inventors of the present invention have the object of solving the above problems and developing an antifouling paint which is excellent in the property of preventing the adhesion of marine organisms and has no danger. As a result of earnest research, the present invention has been completed.

The present invention relates to the following (1) and (2). (1) General formula (I)

[Chemical 2] (In the formula, R ¹ and R ² each independently represent a hydrogen atom, a chlorine atom, a methyl group or an ethyl group) and one or more unsaturated acid anhydrides and one or more copolymerizable therewith Containing a polymer obtained by polymerizing another unsaturated monomer, (B) a benzothiazole derivative, (C) a copper compound antifouling agent, and (D) an aliphatic amide-based dispersion and anti-sagging agent An antifouling paint composition. (2) A cyanoaromatic poison is further contained.
The composition for antifouling paint as described above.

In the present invention, the unsaturated acid anhydride represented by the general formula (I) includes maleic anhydride, methyl maleic anhydride, dimethyl maleic anhydride, ethyl maleic anhydride, chloromaleic anhydride. And dichloromaleic anhydride. Further, the unsaturated acid anhydride represented by the above general formula (I) can be used alone or in combination of two or more kinds.

The unsaturated acid anhydride represented by the general formula (I) used in the present invention is 1 to 50 with respect to all monomers.
It is preferably selected arbitrarily between mol%, but particularly preferably 10 to 40 mol%. If it is less than 1 mol%, it is difficult to obtain a resin having sufficient hydrolyzability, and if it exceeds 50 mol%, unreacted unsaturated acid anhydride remains and the stability of the coating film tends to be adversely affected.

The unsaturated monomer other than the general formula (I) used in the present invention is not particularly limited.
Acrylic acid or methacrylic acid methyl ester, ethyl ester, n-propyl ester, iso-propyl ester, n-butyl ester, iso-butyl ester, sec
-Butyl ester, tert-butyl ester, 2-ethylhexyl ester, octyl ester, nonyl ester, decyl ester, undecyl ester, dodecyl ester, tridecyl ester, tetradecyl ester,
Pentadecyl ester, hexadecyl ester, heptadecyl ester, octadecyl ester, nonadecyl ester, eicosyl ester, heneicosyl ester, docosyl ester, cyclohexyl ester, benzyl ester, phenyl ester, methoxyethyl ester, dimethylaminoethyl ester, Dimethylaminopropyl ester, 2-chloroethyl ester, 2,
2,2-trichloroethyl ester, 2-fluoroethyl ester, 2,2,2-trifluoroethyl ester, 2-cyanoethyl ester, methoxydiethylene glycol ester, methoxydipropylene glycol ester, methoxytriethylene glycol ester, trimethylsilyl ester, triethyl Silyl ester,
Tripropylsilyl ester, tributylsilyl ester, trihexylsilyl ester, trimethoxysilyl ester, triethoxysilyl ester, tripropoxysilyl ester, tributoxysilyl ester, trihexyloxysilyl ester, triphenylsilyl ester, triphenoxysilyl ester, etc. Acrylic acid or methacrylic acid ester monomers, styrene monomers such as styrene, α-methylstyrene and pt-butylstyrene, polyolefin monomers such as butadiene, isoprene and chloroprene, vinyl monomers such as vinyl chloride and vinyl acetate. Monomers and other nitrile-based monomers such as acrylonitrile and methacrylonitrile may be mentioned.

The polymer may be prepared by a method of polymerizing while adding a solution containing other monomers and a radical polymerization catalyst dropwise to a solvent solution of the unsaturated acid anhydride represented by the general formula (I). it can. The reaction temperature is about 0
180 ° C, preferably about 40-170 ° C. The dropping time is 1 to 10 hours, preferably 2 to 6 hours. The organic solvent used is not reactive with unsaturated acid anhydride, preferably a low hydrophilic solvent, especially xylene,
Aromatic solvents such as toluene are preferred.

As the radical polymerization catalyst to be used, an initiator which can be used for usual radical polymerization such as an azo compound and a peroxide compound can be used. Specifically, 2,
2'-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis (cyclopropylpropionitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 2, 2'-azobis (isobutyronitrile), 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane-1)
-Carbonitrile), 2-phenylazo-4-methoxy-2,4-dimethylvaleronitrile, benzoyl peroxide, di-tert-butylperoxybenzoate and the like. The amount of the initiator used is not particularly limited,
It is preferably 0.1 to 5% by weight, more preferably 0.2 to 4% by weight, based on the total amount of monomers. The number average molecular weight of the obtained polymer is not particularly limited, but from the viewpoint of various properties as a coating resin, it is preferably 3,000.
0 to 200,000, more preferably 5,000 to 5
It is 10,000. The number average molecular weight in the present invention is a value measured by a gel permeation chromatography method and converted using a standard polystyrene calibration curve.

A suitable chain transfer agent may be added during the polymerization for the purpose of controlling the molecular weight. Specifically, methanethiol, ethanethiol, n-propanethiol, is
o-propanethiol, n-butanethiol, 2-methylpropanethiol, 3-methylpropanethiol,
1,1-dimethylethanethiol, 1-hexanethiol, 1-octanethiol, 1-decanethiol, benzenethiol, 2-methylbenzenethiol, 3-methylbenzenethiol, 4-methylbenzenethiol, 2
-Ethylbenzenethiol, 3-ethylbenzenethiol, 4-ethylbenzenethiol, bis (4-hydroxydimethylphenyl) disulfide, bis (2-chloromethylphenyl) disulfide, bis (2-bromomethylphenyl) disulfide, dinaphthyl disulfide,
Examples include di-2-benzothiadisulfide, α-methylstyrene dimer, carbon tetrachloride, carbon tetrabromide, chloroform and the like. The blending amount of the chain transfer agent can be appropriately selected depending on the molecular weight of the target polymer. The amount of the solvent used is not particularly limited, but is usually 1 / (mass ratio) to all the monomers.
It is about 2 to 2 times. The polymerization is performed under an inert gas atmosphere. Inert gases include nitrogen, argon, helium,
Examples include neon.

In the present invention, the benzothiazole derivative added to the polymer solution is preferably a sulfur-substituted benzothiazole, and more specifically, 2-mercaptobenzothiazole, dibenzothiazyl disulfide, N. -Oxydiethylenebenzothiazyl-2-sulfenamide, N, N-diisopropylbenzothiazyl-2-sulfenamide, N, N-dicyclohexylbenzothiazyl-2-sulfenamide, 3-
There are (2-benzothiazylthio) propionic acid, (2-benzothiazylthio) acetic acid and the like, and any commonly known benzothiazole derivative can be used. The amount used is not particularly limited, but it is preferably used in the range of 0.1% by weight or more and 50% by weight or less based on the resin solid content. If it is less than 0.1% by weight, there is almost no effect of addition, and thickening occurs due to the formation of a coating with a copper compound, and if it exceeds 50% by weight, it becomes difficult to form a good coating film.

The copper compound antifouling agent used in the antifouling coating composition of the present invention includes cupric chromate, cupric ferrocyanate, cupric quinoline, cupric δ-hydroquinone, and olein. Examples include cupric acid, cupric nitrate, cupric phosphate, cupric tartrate, cuprous oxide, cuprous iodide, and cuprous sulfite. The amount used is not particularly limited, but it is preferably used in the range of 50% by weight or more and 500% by weight or less with respect to the resin solid content. If it is less than 50% by weight, sufficient antifouling effect tends not to be exhibited, and if it exceeds 500% by weight, a good coating film tends not to be formed.

The antifouling coating composition of the present invention provides a stable coating composition with little thickening for a long period while maintaining a good dispersion state by using an aliphatic amide type dispersion and an anti-sagging agent. can do. Examples of the aliphatic amide-based dispersion and anti-sagging agent used in the antifouling coating composition of the present invention include Disparlon 6900-20X (Kusumoto Kasei Co., Ltd.), Taren 5200-25, 7200-20,
7500-20, 8300-20, 8400-20, 8
700-20, KY2000, KY4000, M102
0, DO530, BA600, VA100, VA80
No. 0, FLOWNON SP1000, SH290, CHIXOL W300 (Kyoeisha Chemical Co., Ltd.), etc. The amount used is not particularly limited, but 0.01 to the resin solid content.
It is preferably used in the range of not less than 30% by weight and not more than 30% by weight. If the amount is less than 0.01% by weight, the antifouling agent and the pigment are not sufficiently dispersed without adding any effect, and if the amount exceeds 30% by weight, it becomes difficult to form a good paint or coating film.

By further using a cyanoaromatic poison in the antifouling coating composition of the present invention, it is possible to obtain a uniform coating without thickening for a long period of time. The cyanoaromatic poisons used in the antifouling coating composition of the present invention include:
4,5,6-tetrachloroisophthalonitrile, 2,
4,5,6-Tetrabromoisophthalonitrile, 2-amino-1-butoxycarbonyl-4,5-dicyanoimidazole, 1-acetyl-3- (2-chlorophenyl)
-4-Cyanopyrrole, etc.
Although not particularly limited, it is preferably 1% by weight or more and 50% by weight or less with respect to the resin solid content. If it is less than 1% by weight, it hardly shows the effect as an antifouling agent, and if it exceeds 50% by weight, it is difficult to form a good coating film. Further, the antifouling coating composition of the present invention may be mixed with other polymers to the extent that the effects of the present invention are not impaired. The above antifouling paint composition can be made into an antifouling paint by adding known colorants such as pigments, known extenders, other known antifouling agents, and various additives.

Typical known pigments include inorganic pigments such as titanium oxide (titanium white), red iron oxide, carbon black, phthalocyanine blue and phthalocyanine green, and organic pigments such as azo, cyanine and quinacridone pigments. However, an inorganic pigment is usually used. Known extenders include barium sulfate, calcium carbonate, talc, mica, silica and the like. Other known representative antifouling agents include inorganic antifouling agents such as zinc oxide, zinc chromate, and strontium chromate.
Organic antifouling agents include 4,5-dichloro-2-N-octyl-3 (2H) -isothiazolone. Also,
The combined use of an organic tin compound, a triazine compound, an organic sulfur compound or the like as an antifouling agent does not hinder at all.
Further, rosin, gum rosin, wood rosin, tall oil rosin and the like can be used in combination as the dissolution aid.
The antifouling coating composition of the present invention thus obtained,
It is useful as ship bottom paint, fishing net paint, etc.

[0020]

EXAMPLES Next, the present invention will be explained with reference to examples, but the present invention is not limited to these.

Production Example 1 Xylene 75.0 was placed in a four-necked flask equipped with a stirrer, a condenser, a nitrogen gas inlet tube, a dropping funnel, and a thermometer.
g and 16.89 g of maleic anhydride were inserted and the mixture was maintained at 95 ° C. with stirring. Next, n-butyl methacrylate 8
1.62 g, n-butyl acrylate 51.5 g, 2,
A mixture of 0.375 g of 2'-azobisisobutyronitrile (hereinafter abbreviated as AIBN) was added dropwise over 3 hours while stirring under a nitrogen gas stream. After the dropping was completed, the temperature was kept at 95 ° C. for 1 hour with further stirring. Then xylene 1
A mixture of 5.0 g and AIBN 0.30 g was added dropwise over 1 hour, and the mixture was kept warm at 95 ° C. for 30 minutes, and then xylene 15.
A mixture of 0 g and AIBN 0.3 g was added dropwise over 30 minutes. After that, incubate at 95 ℃ for 2 hours, xylene 45.0g
Was added and then allowed to cool to produce a varnish. The number average molecular weight of the polymer was 32,000.

Production Example 2 Xylene 62.5 was placed in a four-necked flask equipped with a stirrer, a condenser, a nitrogen gas introduction tube, a dropping funnel, and a thermometer.
g and 29.13 g of maleic anhydride were added and the mixture was maintained at 95 ° C. with stirring. Next, n-butyl methacrylate 7
0.39 g, n-butyl acrylate 25.37 g, AI
BN1.25 g, α-methylstyrene dimer 1.0 g
The mixture of was added dropwise over 4 hours while stirring under a nitrogen gas stream. After completion of dropping, continue stirring at 95 ° C for 1 hour.
I kept it warm for an hour. Next, xylene 12.5g, AIBN
0.25 g of the mixture was added dropwise over 1 hour and the mixture was mixed at 95 ° C for 3 hours.
After being kept warm for 0 minutes, 12.5 g of xylene, AIBN0.
25 g of the mixture was added dropwise over 30 minutes. 95 ° C thereafter
The mixture was kept warm for 2 hours, and after adding 37.5 g of xylene, the mixture was allowed to cool to produce a varnish. The number average molecular weight of the polymer is 1
It was 2,700.

Production Example 3 Xylene 75.0 was placed in a four-necked flask equipped with a stirrer, a condenser, a nitrogen gas inlet tube, a dropping funnel, and a thermometer.
g, and maleic anhydride 22.55 g were inserted and the temperature was maintained at 95 ° C. with stirring. Next, n-butyl methacrylate 9
8.12 g, n-butyl acrylate 29.47 g, AI
BN 1.50 g, α-methylstyrene dimer 0.75
The mixture of g was added dropwise over 4 hours while stirring under a nitrogen gas stream. After the dropping was completed, the temperature was kept at 95 ° C. for 1 hour with further stirring. Next, 15.0 g of xylene and AIBN
0.30 g of the mixture was added dropwise over 1 hour and the mixture was mixed at 95 ° C for 3 hours.
After being kept warm for 0 minutes, 15.0 g of xylene and AIBN0.
30 g of the mixture was added dropwise over 30 minutes. 95 ° C thereafter
The mixture was kept warm for 2 hours, 45.0 g of xylene was added, and the mixture was allowed to cool to produce a varnish. The number average molecular weight of the polymer is 1
It was 3,800.

Production Example 4 Xylene 75.0 was placed in a four-necked flask equipped with a stirrer, a condenser, a nitrogen gas introduction tube, a dropping funnel, and a thermometer.
g and 22.75 g of maleic anhydride were added and the mixture was maintained at 95 ° C. with stirring. Next, n-butyl methacrylate 8
2.48 g, n-butyl acrylate 44.60 g, AI
BN 1.50 g, α-methylstyrene dimer 0.75
The mixture of g was added dropwise over 4 hours while stirring under a nitrogen gas stream. After the dropping was completed, the temperature was kept at 95 ° C. for 1 hour with further stirring. Next, 15.0 g of xylene and AIBN
0.30 g of the mixture was added dropwise over 1 hour and the mixture was mixed at 95 ° C for 3 hours.
After being kept warm for 0 minutes, 15.0 g of xylene and AIBN0.
30 g of the mixture was added dropwise over 30 minutes. 95 ° C thereafter
The mixture was kept warm for 2 hours, 45.0 g of xylene was added, and the mixture was allowed to cool to produce a varnish. The number average molecular weight of the polymer is 1
It was 5,100.

Production Example 5 Xylene 250 was placed in a four-necked flask equipped with a stirrer, a condenser, a nitrogen gas introduction tube, a dropping funnel, and a thermometer.
g and 77.7 g of maleic anhydride were added and stirred with stirring 9
Hold at 5 ° C. Next, n-butyl methacrylate 169
g, n-butyl acrylate 253 g, AIBN 1.67
The mixture of g was added dropwise over 3 hours while stirring under a nitrogen gas stream. After the dropping was completed, the temperature was kept at 95 ° C. for 1 hour with further stirring. Next, 50.0 g of xylene and AIBN
1.00 g of the mixture was added dropwise over 1 hour and the mixture was mixed at 95 ° C for 3 hours.
After being kept warm for 0 minutes, 50.0 g of xylene and AIBN1.
00 g of the mixture was added dropwise over 30 minutes. 95 ° C thereafter
The mixture was kept warm for 2 hours, 150 g of xylene was added, and the mixture was allowed to cool to produce a varnish. The number average molecular weight of the polymer is 16,
It was 300.

Production Example 6 Xylene 300 was placed in a four-necked flask equipped with a stirrer, a condenser, a nitrogen gas introduction tube, a dropping funnel, and a thermometer.
g, 95.2 g of maleic anhydride, and while stirring 9
Hold at 5 ° C. Next, n-butyl methacrylate 69.
1 g, n-butyl acrylate 436 g, AIBN 6.0
0 g of the mixture was added dropwise over 3 hours while stirring under a nitrogen gas stream. After completion of dropping, 95 ° C with further stirring
It was kept warm for 1 hour. Next, 60.0 g of xylene and AIB
A mixture of 1.2 g of N was added dropwise over 1 hour, and the mixture was mixed at 95 ° C. for 3 hours.
After being kept warm for 0 minutes, 60.0 g of xylene and AIBN1.
2 g of the mixture was added dropwise over 30 minutes. Then, the temperature was kept at 95 ° C. for 2 hours, 180 g of xylene was added, and the mixture was allowed to cool to produce a varnish. The number average molecular weight of the polymer is 12,5
It was 00.

Production Example 7 Xylene 375 was placed in a four-necked flask equipped with a stirrer, a condenser, a nitrogen gas introducing tube, a dropping funnel, and a thermometer.
g, maleic anhydride 181 g, and 95 with stirring
Hold at ℃. Next, n-butyl methacrylate 175
g, n-butyl acrylate 394 g, AIBN 2.50
The mixture of g was added dropwise over 4 hours while stirring under a nitrogen gas stream. After the dropping was completed, the temperature was kept at 95 ° C. for 1 hour with further stirring. Next, 75.0 g of xylene and AIBN
1.50 g of the mixture was added dropwise over 1 hour and the mixture was mixed at 95 ° C for 3 hours.
After being kept warm for 0 minutes, 75.0 g of xylene, AIBN1.
50 g of the mixture was added dropwise over 30 minutes. 95 ° C thereafter
The mixture was kept warm for 2 hours, 225 g of xylene was added, and the mixture was allowed to cool to produce a varnish. The number average molecular weight of the polymer is 11,
It was 500.

Production Example 8 Xylene 300 was placed in a four-necked flask equipped with a stirrer, a condenser, a nitrogen gas introducing tube, a dropping funnel, and a thermometer.
g, maleic anhydride 146 g, and with stirring, 95
Hold at ℃. Next, n-butyl methacrylate 70.8
g, n-butyl acrylate 383 g, AIBN 2.00
The mixture of g was added dropwise over 4 hours while stirring under a nitrogen gas stream. After the dropping was completed, the temperature was kept at 95 ° C. for 1 hour with further stirring. Next, 60.0 g of xylene and AIBN
1.20 g of the mixture was added dropwise over 1 hour and the mixture was mixed at 95 ° C for 3 hours.
After being kept warm for 0 minutes, 60.0 g of xylene and AIBN1.
20 g of the mixture was added dropwise over 30 minutes. 95 ° C thereafter
The mixture was kept warm for 2 hours, 180 g of xylene was added, and the mixture was allowed to cool to produce a varnish. The number average molecular weight of the polymer is 11,
It was 700.

Examples 1 to 10 Resin solids content of 15 for each varnish produced in the above production example
To a varnish corresponding to g, 45 g of cuprous oxide (manufactured by Nisshin Chemco Ltd.) and the substances shown in Table 1 were blended, glass beads (diameter 2 mm) were further added, and after kneading and stirring using a mechanical stirrer, The glass beads were filtered off to prepare an antifouling paint composition.

[0030]

[Table 1]

Comparative Examples 1 to 8 Resin solids content of 15 for each varnish produced in the above production example
45 g of cuprous oxide (manufactured by Nisshin Chemco Ltd.) and the substances shown in Table 2 were added to a varnish corresponding to g, glass beads (diameter 2 mm) were further added, and the mixture was kneaded and stirred using a mechanical stirrer. The glass beads were filtered off to prepare an antifouling paint composition.

[0032]

[Table 2]

Storage stability test The antifouling paint compositions prepared in Examples 1 to 10 and Comparative Examples 1 to 8 were sealed in a round metal can and stored overnight in a thermostatic chamber at 50 ° C. Add 10 to 20 ml of xylene to dilute,
Viscosity measured by Krebstomer viscometer is 80 KU
The viscosity was measured at 20 ° C. by adjusting the viscosity to a certain level. Further, the composition for antifouling paint is sealed in a round metal can and sealed at 50 ° C.
It was stored in a constant temperature bath for 20 days. After storage, the state of the antifouling coating composition was observed and the viscosity was measured at 20 ° C. The results are shown in Tables 3 and 4.

[0034]

[Table 3]

[0035]

[Table 4]

The benzothiazole derivatives prepared in Comparative Examples 1 to 5 and the compositions for antifouling paints containing neither the aliphatic amide dispersion nor the anti-sagging agent were remarkably thickened and thus could not be used as the compositions for antifouling paints. . The compositions for antifouling paints prepared by using the dispersions other than the aliphatic amide type and the anti-sagging agent according to Comparative Examples 6 to 8 were not only slightly thickened, but also those which could not be dispersed in granular form remained and were uniform. No composition was obtained. The compositions for antifouling paints prepared according to Examples 1 to 10 of the present invention showed a remarkable effect of suppressing thickening, and at the same time, the contents could be uniformly dispersed.

Coating Test A coating film was prepared on an FRP plate using the composition for antifouling paint used for the above storage stability test and stored at 50 ° C. for 12 days, and naturally dried at room temperature for 2 days. The state of the obtained coating film was observed, and the results are shown in Tables 5 and 6. Good ones were marked with ◯, and bad ones were marked with x.

[0038]

[Table 5]

[0039]

[Table 6]

As is clear from Tables 5 and 6, when the antifouling coating composition of the present invention (Examples 1 to 10) is used, a coating film having a very smooth surface should be formed. I was able to. On the other hand, the coating films prepared using the compositions for antifouling paints of Comparative Examples 1 to 8 had many lumps on the surface, and the surface smoothness was extremely poor.

Coating Film Consumability Test The coated FRP plate obtained in the above coating test was attached to a disc rotor plate and rotated for 2 months at a constant speed (peripheral speed of about 15 knots) with seawater (water temperature 15 ± 2 ° C.). Then, the surface of the coating film was observed. The results are shown in Tables 7 and 8.

[0042]

[Table 7]

[0043]

[Table 8]

As is clear from Tables 7 and 8, the antifouling paint composition of the present invention was found to be very effective as an antifouling paint composition because the consumption of the coating film occurred very uniformly. It was However, the coating films prepared by using the compositions for antifouling paints of Comparative Examples 1 to 8 were unevenly worn, and the unevenness of the coating film surface became more conspicuous than before the start of the test, and the friction resistance with seawater was increased. Became very high.

[0045]

The antifouling coating composition of the present invention does not have the danger of organotin copolymers, exhibits good hydrolyzability, and is increased by kneading with a copper compound. It is possible to form a coating film having excellent surface smoothness without viscous gelation.

Claims (2)

[Claims] 1. (A) General formula (I): (In the formula, R ¹ and R ² each independently represent a hydrogen atom, a chlorine atom, a methyl group or an ethyl group) and one or more unsaturated acid anhydrides and one or more copolymerizable therewith Containing a polymer obtained by polymerizing another unsaturated monomer, (B) a benzothiazole derivative, (C) a copper compound antifouling agent, and (D) an aliphatic amide-based dispersion and anti-sagging agent An antifouling paint composition. 2. The antifouling coating composition according to claim 1, which further comprises a cyanoaromatic poison.