JPH10259351A - Nontar epoxy resin coating composition and heavy-duty corrosionproof coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nontar epoxy resin coating compsn. which can exhibit an excellent performance as a heavy-duty corrosionproof coating material on all the parts of ships, i.e., shell plates, exposed decks, upper structures, holding parts, and ballast tanks, and can form a coating film excellent in interlayer adhesion when a heavy-duty corrosionproof coating film formed this compsn. is coated with a non-organotin hydrolyzable corrosionproof coating material or one of various topcoating materials and to provide a heavy-duty corrosionproof coating film formed from the same. SOLUTION: This compsn. comprises a bisphenol A epoxy resin (A), a vinyl chloride polymer (B), and a polyamide or its modification (C) as the curative. A heavy-duty corrosionproof coating film is formed from the compsn. Pref., the epoxy resin has an epoxy equivalent of 100-500. Pref., the vinyl chloride polymer is a vinyl chloride-alkyl vinyl ether copolymer, Pref., the compsn. further contains an aluminum powder and tricresyl phosphate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention can exhibit excellent performance as a heavy-duty anticorrosion paint for all parts of the outer shell, exposed deck, superstructure, hold, and ballast tank of a ship.
If a non-organic tin-based hydrolysis-type antifouling paint or various top-coating paints are applied on the heavy-duty anti-corrosion paint film, a non-tar epoxy resin paint composition such that a film having excellent interlayer adhesive strength is formed, and The present invention relates to a heavy duty anticorrosion coating formed from a coating composition.

[0002]

BACKGROUND OF THE INVENTION Heretofore, different anticorrosive paints have been used for each part of a ship, such as a shell, an exposed deck, a superstructure, a hold, and a ballast tank.

[0003] Among these various parts of a ship, for example, a ship outer plate is roughly divided into a ship bottom part which is always immersed in water (including fresh water and seawater), and a hull part which is not immersed in water.
It is located in the middle of these, and it can be divided into a waterline part where immersion in water and air exposure are repeated, but when painting on such a ship's outer panel, the outboard part will be exposed to strong sunlight and Exposure to wind waves requires weather resistance, etc., the bottom of the ship is always in water and required antifouling properties, and the water line is subject to strong wind waves, immersion in water and exposure to dry air. Since it is repeated, weather resistance, water resistance, and antifouling properties are required as needed.

[0004] For this reason, conventionally, in order to apply a paint having a function required for each part, a plurality of types of dedicated primers are prepared in consideration of the adhesiveness and the like to secure the adhesiveness and corrosion resistance. Was.

Conventionally, a heavy tar-epoxy anti-corrosion paint having excellent anti-corrosion properties has been applied to the bottom of the ship and, if necessary, the portion including the water line portion. In addition, tar has a problem that it is difficult to determine by visual inspection the corrosion after coating, the burnout due to the thermal influence of welding and fusing, the state of the coating film, and the like because the color of the tar is black.

Further, in a paint containing tar, tar content is transferred (tar bleed) to an overcoat layer coated on the coating film, thereby impairing the aesthetic appearance of the coated ship, and having an antifouling property.
There is a disadvantage that functions such as weather resistance are adversely affected.

[0007] In addition, as a primer used for the outer portion of the outer plate and, if necessary, for the water line portion, a non-tar primer is generally used in order to avoid tar bleed. However, when a tar epoxy-based heavy anti-corrosion paint with excellent anti-corrosion properties is used for the bottom of the ship or the primer for the bottom of the ship and the water line, cure the tar / non-tar primer separately ( In other words, it is necessary to apply different paints by carefully applying different paints by applying a sheet or tape and protecting the non-painted parts), carefully devising the wrap part (the part where different kinds of paints overlap), and using another paint. At the time of "switching", it was necessary to sufficiently wash the coating machine (vessel), which required complicated steps and wasteful use of thinner.

Further, conventionally, when a nonorganic tin-based hydrolyzable antifouling paint is applied on a paint film made of a tar epoxy heavy anticorrosive paint, the resulting paint film has poor adhesion to each other. After pre-painting a vinyl-based binder coat on a coating made of tar-epoxy heavy anticorrosion paint,
Non-organic tin-based hydrolyzable antifouling paint had to be applied. In addition, after applying the tar epoxy-based anticorrosion paint, when applying overcoating on the coating film, a predetermined interval (time interval) is provided and the overcoating is applied. Since this interval is relatively short, complicated steps and construction management were required.

Conventionally, as described above, anticorrosion paints used for portions other than the submerged portion of the ship's outer panel, exposed deck portions, and the like are different from each other.
In each case, dedicated top coat paint and binder coat are used, and in addition, in the past, an extremely large number of brands of paint had to be stocked to meet the diverse needs of customers. Therefore, the cost of storing, transporting, and storing the paint is increased, and there is a problem that the painting period is lengthened due to the complicated painting process and complicated process management is required.

For this reason, a specific type of paint is applied to a ship's bottom including a ship's bottom, a water line, a shipboard, an exposed deck, a superstructure, a hold, a ballast tank, etc. Uniformly applied to all parts to obtain functions such as anti-corrosion properties.If necessary, over-coat with non-organic tin-based hydrolyzable heavy-duty anti-corrosion paints, etc. It has been desired to develop an anticorrosive paint capable of forming a coating and shortening the coating period.

[0011]

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems associated with the prior art as described above, and it is possible to integrate primers for various parts of the hull, such as outer panels and exposed decks, into only one type. The use of a binder coat can be omitted when further coating a non-organic tin-based hydrolysis-type antifouling paint, and the corrosion resistance and weather resistance are equal to or better than those of the tar epoxy-based anticorrosion paint.
Functions such as water resistance and antifouling properties can be imparted to ship outer panels, etc., streamlining the painting process, reducing paint storage costs, and improving the hygiene of paint workers and protecting the environment. It is an object of the present invention to provide an anticorrosion paint as described above and a coating film formed by applying the anticorrosion paint.

[0012]

SUMMARY OF THE INVENTION A non-tar epoxy resin coating composition according to the present invention comprises (a) a bisphenol epoxy resin (preferably a bisphenol epoxy resin having an epoxy equivalent of 100 to 500), and (b) a vinyl chloride copolymer. Coalescing, and
(c) It is characterized by comprising a curing agent comprising a polyamide or a modified product thereof.

In the present invention, the above (a), (b) and (c)
It is desirable that (d) aluminum powder be further contained in addition to the components. In the present invention, the coating composition preferably contains tricresyl phosphate. In the present invention, the vinyl chloride copolymer is preferably a vinyl chloride / alkyl vinyl ether copolymer.

The above non-tar epoxy resin coating composition is suitable as a heavy duty anticorrosion coating. The heavy duty anticorrosion coating film according to the present invention is formed from the above non-tar epoxy resin coating composition.

According to the non-tar epoxy resin coating composition of the present invention, the anticorrosion coating for each part of the hull such as the outer panel and the exposed deck can be integrated into only one type, and the non-organic tin-based hydrolysis type anticorrosion coating can be integrated. The use of a binder coat can be omitted when further applying a stain paint to the top coat, and functions such as corrosion resistance, weather resistance, water resistance, and stain resistance equivalent to or higher than those of the tar epoxy-based anticorrosion paint can be imparted to a ship outer panel. .

Moreover, after applying the non-tar epoxy resin coating composition, without using a binder coat,
Even if a top coat such as a non-organic tin-based hydrolyzable antifouling paint is used at a long coating interval, excellent adhesion strength can be obtained, contributing to streamlining of the coating process and streamlining of the shipbuilding process. Storage costs can be reduced.
The non-tar epoxy resin coating composition is also effective in improving the hygiene of coating workers and protecting the environment.

[0017]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the non-tar epoxy resin coating composition according to the present invention and a coating film obtained by applying and curing the composition will be described in detail.

[Non-tar epoxy resin coating composition] The non-tar epoxy resin coating composition according to the present invention includes:
It contains (a) a bisphenol-type epoxy resin, (b) a vinyl chloride copolymer, and (c) a curing agent composed of polyamide or a modified product thereof.

<Bisphenol type epoxy resin> The epoxy resin preferably has an epoxy equivalent of 1
A bisphenol type is used in the range of 60 to 500, more preferably 160 to 300. Such epoxy resins are usually liquid to solid. The epoxy equivalent of the bisphenol-type epoxy resin blended in the coating composition of the present invention is preferably in the above range from the viewpoint of both the adhesion of the coating composition and the workability during coating.

Further, in the present invention, among the epoxy resins, bisphenol-type epoxy resins are included, so that the coated and formed film is tough and flexible, and therefore has excellent adhesion.

Specific examples of such bisphenol type epoxy resins include, for example, bisphenol A type and bisphenol F type epoxy resins.
Examples thereof include dimer acid-modified and polysulfide-modified epoxy resins, and hydrogenated products of these bisphenol-type epoxy resins.

Examples of the bisphenol A type epoxy resin include bisphenol A diglycidyl ether, bisphenol A polypropylene oxide diglycidyl ether, bisphenol A ethylene oxide diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, and hydrogenated bisphenol A propylene oxide diglycidyl ether. Examples include bisphenol A type diglycidyl ethers such as glycidyl ether. Examples of bisphenol F type epoxy resins include bisphenol F type diglycidyl ethers such as bisphenol F diglycidyl ether.

Of these, epoxy resins such as bisphenol A type are preferred. As such an epoxy resin, if it is liquid at normal temperature, “Epicoat 82
8 (trade name) "(Shell Co., Ltd., epoxy equivalent 180
~ 190, viscosity 12,000 ~ 15,000 cPs / 2
5 ° C.), “Epototo YDF-170 (trade name)” (manufactured by Toto Kasei Co., Ltd., epoxy equivalent 160 to 180, viscosity 2,000 to 5,000 cPs), “Flep 60 (trade name)” (Toray Thiokol ( Co., Ltd., epoxy equivalent about 2
80, a viscosity of about 17,000 cPs / 25 ° C.) and the like, and in a semi-solid state at normal temperature, “Epicoat 834 (trade name)” (manufactured by Shell Co., Ltd., epoxy equivalent 230 to 270), "Epototo YD134 (trade name)" (manufactured by Toto Kasei Co., Ltd., epoxy equivalent 230 to 27)
0) and the like, and in the form of a solid at room temperature, "Epicoat 1001 (trade name)" (Shell Co., Ltd.)
And an epoxy equivalent of 450 to 500).

In the present invention, the epoxy equivalent of 16
Epoxy resins other than those described above can be used together with the bisphenol-type epoxy resin (a) of 0 to 500, for example, an epoxy resin having an epoxy equivalent of more than 500 or an epoxy resin other than the bisphenol type does not adversely affect the object of the present invention. , For example, 60 parts by weight or less based on 100 parts by weight of the bisphenol-type epoxy resin (a).

Such an epoxy equivalent is 160 to 500.
Examples of the epoxy resin that deviates from the above include "Epototo YD-172 (trade name)" (manufactured by Toto Kasei Co., Ltd., epoxy equivalent: 600 to 700). Examples of the non-bisphenol type epoxy resin include cycloaliphatic, non-cyclic aliphatic and epoxidized oil-based epoxy resins.

<Vinyl chloride copolymer (b)> Examples of the vinyl chloride copolymer (b) include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl propionate copolymer, and vinyl chloride. In addition to alkyl vinyl ether copolymers, vinyl chloride-acrylonitrile copolymer, vinyl chloride-diethyl maleate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-maleic anhydride copolymer, vinyl chloride- ) Alkyl acrylate copolymer (alkyl group: about 1 to 5 carbon atoms), vinyl chloride-styrene copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-vinyl stearate copolymer, vinyl chloride-maleic An acid (or maleic acid ester) copolymer, a vinyl chloride-aliphatic vinyl copolymer and the like can be mentioned.

Furthermore, a graft modified product of polyvinyl chloride obtained by grafting and modifying an “other monomer” other than polyvinyl chloride to polyvinyl chloride, or a vinyl chloride monomer to an “other polymer” other than polyvinyl chloride. Grafted copolymers may be mentioned.

The above "other monomers" include the above-mentioned monomers for forming a vinyl chloride copolymer, such as alkyl (meth) acrylate (alkyl group: about 1 to 5 carbon atoms), styrene, acrylonitrile, diethyl maleate and the like. Ethates, olefins (eg, ethylene and propylene), maleic anhydride, vinylidene chloride, stearic acid, maleic acid, maleic acid esters, and aliphatic vinyls.

Among these vinyl chloride copolymers (b), vinyl chloride / alkyl vinyl ether copolymers are particularly excellent in affinity with the bisphenol type epoxy resin (a), and are excellent in overcoating properties and corrosion resistance. Therefore, it is preferable.

The vinyl chloride / alkyl vinyl ether copolymer is a copolymer of vinyl chloride and an alkyl vinyl ether having an alkyl group having 1 to 10, preferably 2 to 5 carbon atoms. Vinyl chloride
Isobutyl vinyl ether copolymer, vinyl chloride-isopropyl vinyl ether copolymer, vinyl chloride-ethyl vinyl ether copolymer and the like are preferably used.

The weight average molecular weight (Mw) of such a vinyl chloride copolymer (b) is usually from 10,000 to 100,
2,000, preferably 20,000 to 50,000, particularly preferably 22,000 to 40,000. When the weight average molecular weight is in the above range, the affinity with the epoxy resin tends to be improved.

Among such vinyl chloride / alkyl vinyl ether copolymers, examples of vinyl chloride / isobutyl vinyl ether copolymers include "Laloflex LR8829 (trade name)" and "Laloflex MP25 (trade name)" manufactured by BASF. )), "Laroflex MP35 (trade name)", "Laloflex MP45 (trade name)" and the like.

These vinyl chloride copolymers can be used alone or in combination of two or more. These vinyl chloride copolymers (b) are used in the non-tar epoxy resin coating composition as a component: bisphenol epoxy resin.
(a) It is usually used in an amount of 5 to 90 parts by weight, preferably 10 to 30 parts by weight, based on 100 parts by weight. When the vinyl chloride copolymer (b) is contained in the coating composition in such an amount, the affinity with the bisphenol type epoxy resin (a) is good, and the anticorrosion property and the top coating property are both good. Tend. The blending ratio of the vinyl chloride copolymer (b) is desirably within the above range from the viewpoint of both the anticorrosion performance of the coating film and the overcoating property of the topcoat.

In the present invention, together with such a vinyl chloride copolymer (b) of a thermoplastic resin, other thermoplastic resins other than the vinyl chloride copolymer (b) may be used as long as the object of the present invention is not adversely affected. Thermoplastic resin ". When the other thermoplastic resin is contained in the non-tar epoxy resin heavy corrosion protection paint, the other thermoplastic resin is based on 100 parts by weight of the bisphenol epoxy resin (a).
The total amount of the thermoplastic resin component including the vinyl chloride copolymer (b) is usually 5 to 90 parts by weight, preferably 7 to 50 parts by weight, particularly preferably 10 to 30 parts by weight. It may be.

The thermoplastic resin (rubber) containing the vinyl chloride copolymer (b) is used as a non-tar epoxy resin coating composition (epoxy coating, epoxy anticorrosion coating) to reduce internal stress during curing. To improve the adhesion between the undercoat or undercoat layer and the epoxy layer formed by applying and curing the epoxy paint. In addition, the thermoplastic resin (rubber)
Is solvent-soluble and is dissolved by the solvent in the top coat, so that the adhesion of the epoxy layer to the top coat can be improved and the coating interval limit of the epoxy paint can be extended (relaxed). It contributes to the expansion of applicable types of top coats that can be applied.

Specific examples of the thermoplastic resin (rubber) other than the vinyl chloride copolymer (b) include chlorinated polyolefins such as chlorinated rubber, chlorinated polyethylene and chlorinated polypropylene; Acrylic resins such as methyl acrylate copolymer, propyl (meth) acrylate copolymer, butyl (meth) acrylate copolymer, cyclohexyl (meth) acrylate copolymer; styrene resin; fragrance Aliphatic petroleum resins; aliphatic petroleum resins; urea aldehyde condensation resins; ketone resins; coumarone indene resins; pentadiene polymers.

These thermoplastic resins (rubbers) can be used alone or in combination of two or more. <Curing Agent (c) Made of Polyamide or Modified Product thereof> Polyamide or a modified product thereof is used as the curing agent (c) for the bisphenol-type epoxy resin (a). Since the non-tar epoxy resin coating composition containing such a curing agent (c) can be cured at room temperature, it can be used for applications normally applied at room temperature, such as painting of ship outer panels. preferable.

The amine value of such a polyamide or a modified product thereof is usually 50 to 1000, preferably 80 to 1000.
Preferably, it is 500. When the amine value of the curing agent is in such a range, the balance between the drying property and the adhesion tends to be improved. These curing agents are usually liquid to solid.

As such a polyamide, specifically, for example, “Lacamide N-153 (trade name)”
(Dainippon Ink Chemical Industry Co., Ltd., amine value 80-12
0), “Lacamide TD-966 (trade name)” (manufactured by Dainippon Ink and Chemicals, Inc., amine value 150 to 19)
0), “Sunmide 315 (trade name)” (manufactured by Sanwa Chemical Industry Co., Ltd., amine value 280 to 340) and the like.

Specific examples of the modified polyamide include, for example, an epoxy adduct “PA-23 (trade name)” (Otake Chemical Co., Ltd., amine value 80) obtained by adding an epoxy compound to a polyamide. To 150), Mannich modified product of a modified polyamide, “ADEKA HARDNER E
H-350 (trade name) "(Asahi Denka Kogyo KK, amine value 320 to 380).

Among these polyamides and modified products thereof, adducts of epoxy compounds are preferably used.
One or two of these polyamides and modified products thereof are used.
It can be used in combination of more than one kind.

In the present invention, these polyamides and modified products thereof have an equivalent ratio of an epoxy component to an amine component (epoxy component: amine component) based on bisphenol type epoxy resin (a) in the non-tar epoxy resin coating composition. )
But usually 1: 0.35 to 1: 0.9, preferably 1:
It is desirable to use an amount such that it becomes 0.4 to 1: 0.8. When the polyamide and the modified product thereof are used in such an amount, there is a tendency that a coating film excellent in drying property, anticorrosion property, and topcoat performance is obtained. In other words, in the present invention, these polyamides and modified products thereof are used as the bisphenol type epoxy resin (a) 10 in the non-tar epoxy resin coating composition.
It is used in an amount of usually 10 to 80 parts by weight, preferably 20 to 70 parts by weight based on 0 parts by weight.

In the present invention, in addition to these polyamides and modified products thereof, "another curing agent for epoxy resin" may be contained within a range not against the object. The other curing agent for epoxy resin is not particularly limited as long as it can react and cure the epoxy resin, and is not limited to the above-mentioned polyamides and modified products thereof, such as amines, carboxylic acids, and acid anhydrides. And a silanol-based curing agent. As such other amine-based curing agents, liquid-solid curing agents having an amine value of 50 to 1,000, preferably 80 to 500 are preferable.

Examples of these other amine-based curing agents for epoxy resins include aliphatic amines such as polyalkylene polyamines, aromatic amines, alicyclic amines, and the like. An epoxy adduct, a modified Mannich, or a modified carboxylic acid can be used.

Further, ketimine type curing agents obtained by modifying these amine compounds with ketones can also be used. Specific examples of such “other amine compounds” include modified phenolic amines such as “ancamine MCA (trade name)”, a modified alicyclic polyamine of the ketimine type (anchor chemical company, amine value 250 to 350). "Adeka Hardener EH10" which is a modified aromatic polyamine such as "Card Light 541LV (trade name)" (manufactured by Anchor Chemical Co., amine value 260 to 350).
1 (trade name) "(manufactured by Asahi Denka Co., Ltd., amine value 400 to
Various compounds such as 500) can be exemplified.

These amine compounds can be used alone or in combination of two or more. These `` other amine compounds '' are the total amount of the polyamide and its modified product (c) added, based on 100 parts by weight of the bisphenol type epoxy resin (a) in the non-tar epoxy resin coating composition. Usually 10 to 80 parts by weight, preferably 20
Used in amounts of up to 70 parts by weight. In other words, the resin (a)
Epoxy equivalent: amine equivalent of curing agent = usually 1: 0.3
It is used in such an amount as to be 5 to 1: 0.9, preferably 1: 0.4 to 1: 0.8.

<Other Additives> In the non-tar epoxy resin coating composition (heavy anticorrosion coating) according to the present invention, various plasticizers, extenders, coloring pigments, rust preventing pigments, solvents,
A curing accelerator, anti-sagging agent, anti-settling agent and the like may be blended.

The non-tar epoxy resin coating composition of the present invention preferably contains aluminum powder as the pigment component. Examples of the aluminum powder include a leafing type (scale-like) and a non-leafing type (non-scale-like) aluminum powder having an average particle size of 1 to 100 μm.

Such an aluminum powder was added to
When it is blended in an amount of ３０30% by weight, preferably 4〜１０10% by weight, the corrosion resistance is greatly improved, and the water resistance in a submerged environment is improved. When the amount of the aluminum powder exceeds the above range, the viscosity of the coating composition increases with the improvement of the anticorrosion performance, and the kneading property at the time of coating preparation, the handling property at the time of coating, and the like tend to decrease.

Such a non-tar epoxy resin coating composition (non-tar epoxy resin coating) comprises a composition (i) containing: an epoxy resin component (a) and a vinyl chloride copolymer (b). ) And a composition (ii) containing a curing agent component (c), or: a composition (ia) containing an epoxy resin component (a); It is used as a two-pack type with the composition (ii-a) containing the copolymer (b) and the curing agent component (c). In the present invention,
Is preferred.

Each of these liquids is stored in a separate container, and is used by mixing them at the time of applying the primer, or is used by mixing at the time of coating using a mixing sprayer such as a two-head gun.

The above-mentioned non-tar epoxy resin coating composition according to the present invention has excellent adhesion to various top coatings, but the following are particularly preferred examples of the coating preferably used as the top coating in various parts of the hull.

That is, first, the non-tar epoxy resin anticorrosion paint is applied to the bottom (a) or the bottom and the water line (b) of each part of the ship, preferably the ship's ship. A primer is applied to the entire outer plate including the bottom portion, the water line portion and the outer side portion as a primer, and then a non-organic tin-based hydrolyzable antifouling paint as described below is further applied on the primer coating with the primer layer. It is preferable because it has excellent interlayer adhesion with the antifouling paint layer.

The nonorganic tin-based hydrolyzable antifouling paint includes (i) a trialkylsilyl ester copolymer or (ii) at least one side chain terminal of a vinyl resin having a metal ester bond. And a resin or the like to which an organic acid is bonded via an organic solvent.

Of these, the trialkylsilyl ester copolymer (i) and vinyl resin (ii) preferably used in the present invention will be described in more detail. <Trialkylsilyl ester copolymer (i)> The trialkylsilyl ester copolymer has a component unit derived from a trialkylsilyl ester of a polymerizable unsaturated carboxylic acid in an amount of 20 to 65% by weight. Number average molecular weight (M
n) is 1000 to 50,000.

Specific examples of such trialkylsilyl esters include, for example, trimethylsilyl (meth) acrylate, triethylsilyl (meth) acrylate, triisopropylsilyl (meth) acrylate, and (meth) acrylate. Examples thereof include tributylsilyl acrylate, dimethylpropylsilyl (meth) acrylate, monomethyldipropylsilyl (meth) acrylate, and methylethylpropylsilyl (meth) acrylate.

In the present invention, such trialkylsilyl esters may be used alone or in combination of two or more. Among such trialkylsilyl esters, the film forming property of the soil coating composition, storage stability, considering the ease of controlling the scavenging property, etc.
Tributylsilyl (meth) acrylate is most preferably used.

As the monomer (comonomer) copolymerizable with the trialkylsilyl ester, any polymerizable unsaturated compound (ethylenically unsaturated monomer) can be used. Examples thereof include acid alkyl esters, styrenes such as styrene and α-methylstyrene, and vinyl esters such as vinyl acetate and vinyl propionate.

The copolymer has a number average molecular weight (Mn) of about 1,000 to 50,000 as measured by GPC, and a weight average molecular weight (Mw) of usually 1,000 to 1.00.
The molecular weight distribution (Mw / Mn) of the copolymer is usually from 1.0 to 4.0, and the glass transition temperature (Tg) of the copolymer is usually from 15 to It is about 80 ° C., and the viscosity (25 ° C.) of this copolymer in, for example, a 50% xylene solution is usually about 30 to 1000 cPs.

In order to prepare such a film-forming copolymer, for example, usually under an inert atmosphere such as a nitrogen stream,
In an organic solvent such as xylene, trialkylsilyl ester such as tributylsilyl methacrylate and methyl methacrylate in a comonomer are 50% by weight or more (for example, 8%).
0% by weight) and a polymerizable unsaturated compound contained in an amount of
In the presence of a polymerization initiator such as an azo type or a peroxide type such as 2,2′-azobisisobutyronitrile, and a polymerization regulator such as n-octyl mercaptan if necessary,
The reaction may be performed by a method such as radical polymerization at a temperature of about 50 to 120 ° C. for about 2 to 12 hours.

The film-forming copolymer thus obtained contains each component unit in an amount corresponding to the amount of each monomer used. <Vinyl-based resin (ii)> The vinyl-based resin (i) preferably contained in the non-organic tin-based hydrolyzable antifouling paint for overcoating in the present invention.
i) is a vinyl resin in which an organic acid is bonded to at least one side chain terminal via a metal ester bond.

Examples of such a vinyl resin (ii) include the vinyl resins described in JP-A-8-73536 and JP-B-7-108927. Such a vinyl resin (ii) is described in, for example, JP-A-8-73.
As described in JP-A-536, an alcohol residue of an ester is a branched alkyl group having 4 or more carbon atoms or at least 6 carbon atoms having at least one side chain on the second to fourth carbons from the terminal of the main chain. Is a cycloalkyl group of (meth)
Acrylic acid ester, polymerizable unsaturated organic acid monomer,
A base resin is synthesized by copolymerizing with a neutral polymerizable unsaturated monomer, and acid groups (eg, -COOH, -SO
The ₃ H), metal oxides, hydroxides, chlorides, and metal compounds such as sulfides, organic acids monobasic organic acid (e.g. acetic acid, is reacted naphthenate) and at the same time, or the It can be produced by reacting a base resin with a metal salt of a monobasic organic acid.

Examples of the above (meth) acrylate include t-butyl (meth) acrylate and (meth) acrylate.
Examples include cyclohexyl acrylate, and the polymerizable organic acid monomer includes, for example, (meth) acrylic acid, maleic acid, p-styrenesulfonic acid, and the like. As the neutral polymerizable unsaturated monomer, , For example, ethylene, (meth)
Examples include methyl acrylate and ethyl (meth) acrylate. As the metal constituting the metal compound, a divalent or higher valent metal, for example, Cu, Zn, Mn, Ca, Fe,
Al, Te, Ba and the like can be mentioned. [Coating paint for outer part] As coating material for outer part,
Top coatings such as oil (alkyd), phthalic acid resin, chlorinated polyolefin (chlorinated rubber), vinyl, acrylic, epoxy, urethane, silicone alkyd, acrylic silicone, fluororesin etc. be able to.

As the overcoat for the outboard part used in the present invention, urethane-based, epoxy-based, acrylic-based or chlorinated polyolefin-based (chlorinated rubber-based) paints are used in consideration of weather resistance, adhesion, economy and the like. As such a top coat for the outboard part, those manufactured by China Paint Co., Ltd. include "Unimarine (trade name)", an isocyanate cross-linkable two-pack type urethane resin-based top coat, and modified polyamide. "Epicon Marine Topcoat (trade name)" and "Epicon Marine HB (trade name)" of a cross-linking two-pack type epoxy resin-based topcoat, "Lavax Topcoat (trade name)" of a chlorinated polyolefin-based topcoat, acrylic resin-based Acrylic 700 topcoat (trade name) as a topcoat paint and the like can be mentioned. [Water line top coating] As the water line top coating,
In addition to the various paints mentioned in the section of the overcoat for the outer part, non-organic tin-based antifouling paints can be used.

In a severe dry / wet environment where water immersion and air exposure are repeated due to ups and downs of a ship, such as a ship's outer plate, water resistance, weather resistance, corrosion resistance and, if necessary, antifouling properties are required. Therefore, among these, it is preferable to use urethane-based, epoxy-based, acrylic-based, chlorinated polyolefin-based (chlorinated rubber-based) paints, or non-organic tin-based antifouling paints.

As the overcoat for the water line part, those manufactured by China Paint Co., Ltd. include "Unimarine (trade name)", an isocyanate-crosslinkable two-pack type urethane resin-based topcoat, and a modified polyamide crosslinkable two-pack. "Epicon Marine Topcoat (trade name)" and "Epicon Marine HB (trade name)" of epoxy resin-based topcoat, "Rabax Topcoat (trade name)" of chlorinated polyolefin-based topcoat, and "Acrylic resin topcoat" Acry 700 overcoat (trade name) "and the like.

The above-mentioned overcoat paints used in the present invention include components which are usually blended in ship exterior paints, for example, antifouling agents, plasticizers, hydrolysis regulators, pigments, solvents, viscosity modifiers. Agents, other additives, and the like.

In the present invention, a coating film (cured film) obtained by applying and curing each paint such as the above-mentioned non-tar epoxy resin paint composition (heavy anticorrosion paint) and top coat paint is applied to the outer surface of a ship. For forming, for example, an airless spray, an air spray, a brush coating, a roller coating or the like may be used. Prior to the above primer treatment, if necessary,
Rust, oil, water, dust, slime, salt, etc. attached to the outer plate surface may be cleaned and removed. Also, the paint is
It may be diluted with a thinner or the like to an appropriate concentration before use.

The amount of such a paint applied varies depending on the type of ship, the type and combination of paints to be applied, etc., and is not determined unconditionally. The epoxy resin anticorrosion paint composition (primer) is, for example, in an amount of 100 to 500 g / m ² ,
It is applied to a thickness of about 50 to 500 μm, and its dry film thickness is
The non-organic tin-based hydrolyzable antifouling paint which is about 30 to 300 μm and is applied on the primer layer of the bottom of the hull outer panel and the water line part is, for example, in an amount of 200 to 800 g / m ² , It is applied to a thickness of about 50 to 500 μm, its dry film thickness is about 30 to 300 μm, and the urethane paint applied on the primer layer on the outer side of the ship outer panel is, for example, 50 to 300 g / m ² . It is applied in an amount of about 40 to 300 μm in thickness, and its dry film thickness is about 30 to 150 μm.

At the time of airless spraying, for example,
The primary (air) pressure: about 4 to 8 kgf / cm ² , the secondary (paint) pressure: about 100 to 180 kgf / cm ² , and the coating conditions may be set at a gun moving speed of about 50 to 120 cm / sec.

The number of coatings of each of the above paints is not particularly limited, and can be appropriately set according to the paint concentration, the required film thickness, and the like. Ships (painted vessels) obtained by coating and curing each paint so as to have the above-mentioned film thickness include metal vessels such as tankers, cargo ships, passenger ships, fishing boats, barges, and floating docks. Can be

Further, according to the present invention, a non-tar epoxy resin heavy duty anticorrosive paint having excellent overcoating properties is applied to, for example, an exposed portion (deck portion) other than an outer plate, an upper structure portion (an upper structure portion, a housing, a hold portion, If used as a primer for the ballast tank section), the paint type of the entire ship will be greatly reduced.

[0073]

The non-tar epoxy resin coating composition according to the present invention imparts functions such as corrosion resistance, weather resistance, water resistance and antifouling property to the outer shell of a ship which are equal to or higher than those of the tar epoxy type anticorrosion coating. Although it is possible, unlike a tar epoxy anticorrosive paint, there is no deterioration in aesthetic appearance and stain resistance due to spotting on the top coat. Therefore, there is no need to cure the joints of each part.

Furthermore, the coating film (heavy-duty anti-corrosion coating) obtained by applying this non-tar epoxy resin coating composition (heavy-duty anti-corrosion coating) is coated with various top coatings (for example, non-organic tin-based hydrolyzable anti-fouling anti-fouling coating). Paints, chlorinated rubbers, urethanes, and epoxy topcoats), and has excellent adhesion to paint films. For example, the same anticorrosion paint can be used for the submerged part and exposed part of the ship's outer panel, and primers for each part of the hull, such as for the outer panel and exposed deck, are integrated into this one type only, streamlining painting, Labor saving can be achieved.

When a top coat such as a non-organic tin hydrolyzable antifouling paint is further applied on a coating film made of a non-tar epoxy resin paint composition, various top coats are used. It can be used at long coating intervals and has excellent adhesiveness (adhesion) with various top coats, eliminating the need for a binder coat (intermediate coat) before overcoating, streamlining marine painting and building processes, and coating storage costs. Can be reduced.

Furthermore, unlike the conventional tar epoxy resin paint, the non-tar epoxy resin paint composition is less likely to cause skin irritation and irritation when applied.
It is also effective in improving the hygiene of paint workers and protecting the environment.

[0077]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

In the following examples, comparative examples, and the like,
Means "parts by weight". In addition, the amount of each component in the table is
All parts are indicated by "parts by weight" unless otherwise specified. [Production example of non-tar epoxy resin anticorrosion paint] Production of main agent (composition containing epoxy resin) and curing agent (composition containing curing agent component) of non-tar epoxy resin anticorrosion paint having the composition shown in Table 1. did.

In producing the non-tar epoxy resin anticorrosion paint having the composition shown in Table 1, the main components were as follows:
The formulation was sufficiently dispersed using a glass shaker using a paint shaker, and the curing agent was manufactured by uniformly mixing the formulation using a high-speed disper.

When the non-tar epoxy resin anticorrosive paint was applied, the main agent and the curing agent were mixed at the weight ratio shown in Table 1 and immediately applied.

[0081]

[Table 1]

(Note) The raw materials used in Table 1 are as follows. (1) Epikote 828 (trade name): Shell Chemical Co., Ltd.
Bisphenol A type, liquid epoxy resin (epoxy equivalent 180-190) (2) Epicoat 834-85x (trade name): Bisphenol A type, semi-solid epoxy resin (epoxy equivalent 290-310, manufactured by Shell Chemical Co., Ltd.) (Solvent: xylene, nonvolatile content (NV.): 85%) (3) Epicoat 1001-70 (trade name): manufactured by Shell Chemical Co., Ltd., bisphenol A type, solid epoxy resin (epoxy equivalent: 660 to 690, solvent: xylene / Toluene / MIBK, NV.70%) (4) Laroflex MP-25 (trade name): manufactured by BASF, vinyl chloride / vinyl isobutyl ether copolymer (Mw: 28000-30000) (5) TCP: Mitsubishi Gas Tricresyl phosphate manufactured by Chemical Co., Ltd. (6) Talc NKK (trade name): manufactured by Fuji Talc Co., Ltd. (7) Tar : BO Chemical Co., Ltd., swelling charcoal varnish (solvent: xylene, NV.70%) (8) DISPARON 6600 (trade name): Kusumoto Kasei Co., Ltd.
Powdered polyamide type thixotropic agent (9) Petal: Trade name "Pentate Tsubame" (Nippon Petro Kogyo Co., Ltd.)
(10) ALPASTE 1900xS (trade name): Non-refining type aluminum (NV. 75%, manufactured by Toyo Aluminum Co., Ltd.)
(Solvent: xylene, terpene) (11) Lacamide TD966 (trade name): manufactured by Dainippon Ink Co., Ltd., polyamide, amine value 150 to 190, (N
V. 60%, solvent: xylene, 1-butanol) (12) Adeka Hardener EH350 (trade name): modified polyamine, amine value 330 to 380, (NV.100
%), Manufactured by Asahi Denka Kogyo Co., Ltd. (13) TAP (trade name): (Tertiary amine, amine value 620, manufactured by Kayaku Akzo Co., Ltd.) (14) MIBK: methyl isobutyl ketone

[Discoloration Resistance Test of Top Coating Paint] Non-tar epoxy resin anticorrosion paint (primer) to be used on one side of a sandblasted 70 × 150 × 2.3 mm steel plate
Is coated with an air spray to a dry film thickness of 200 μm, dried at 20 ° C. for 24 hours, and then coated with a white chlorinated polyolefin-based overcoat (trade name: Lavacs overcoat white, manufactured by China Paint Co., Ltd.). Was applied using an air spray and dried at 20 ° C. for 24 hours to obtain a test plate. An outdoor exposure table (JIS K5400) in which the test plate was installed at the Ohtake Research Center of Chugoku Paint Co., Ltd. in Otake City, Hiroshima Prefecture so that the painted surface of the test paint on the test plate was on the front.
9.9), and after 30 days of outdoor exposure, the degree of discoloration of the top coat was visually evaluated. Table 2 shows the results.

[0084]

[Table 2]

Undercoat paints “OT-1” to “OT-7”
Can be applied without deteriorating the aesthetic appearance of the overcoated film on the outboard side and the water line because of the excellent discoloration resistance of the overcoated film.

[Corrosion prevention test] Sandblasted 7
The test paint was applied to a steel plate of 0 × 150 × 2.3 mm using an air spray so that the dry film thickness became 200 μm, and dried at 20 ° C. for 7 days to obtain a test plate.

The test plate was placed in a 3% saline solution at 40 ° C. for 180 minutes.
Immersion for several days and adjust the degree of blister to ASTM D 714-5
6. The degree of rusting was visually evaluated according to ASTM D 610-85, and the adhesion was evaluated by the cross-cut tape method (JIS K5).
400, 8.5.2). Table 3 shows the results.

<Evaluation score of blister test> 10 points: no blister 9 points: 0.5 mm diameter blister was 0.2 of the total area of the test plate
8 points: 0.5 mm diameter blisters are 0.5% of the total area of the test plate
7 points: 0.5 to 1 mm diameter blisters are about 0.5% of the total area of the test plate 6 points: 1 to 2 mm diameter blisters are 0. 0% of the total area of the test plate
5 to 1% 5 points: 2 to 3 mm diameter blisters are 1 to 1 of the total area of the test plate
About 5% 4 points: 3-5mm diameter blisters are 5-5 of the total area of the test plate
About 10% 3 points: 3 to 5 mm diameter blisters are 10% of the total area of the test plate.
Approx. 15% 2 points: 3 to 5 mm diameter blisters are 15% of the total area of the test plate.
Approx. 30% 1 point: The blister rust area is 30% or more of the total area of the test plate <Evaluation score of rust test (ASTM D610-85)> 10 points: No rust to rust area is the entire test plate 0.03 of area
9%: Rust area is 0.03% or more of the total area of the test plate.
Less than 1% 8 points: Rust area is 0.1% or more of the total area of test plate 0.3
7 points: Rust area is 0.3% or more and less than 1% of the total area of the test plate 6 points: Rust area is 1% or more and less than 3% of the total area of the test plate 5 points: Rust area is tested 3% or more and less than 10% of the total area of the plate 4 points: Rust area is 10% or more and less than 16% of the total area of the test plate 3 points: Rust area is 16% or more and less than 33% of the total area of the test plate 2 Point: The rusting area is 33% or more and less than 50% of the total area of the test plate 1 point: The rusting area is 50% or more of the total area of the test plate <Evaluation score of grid test> 10 points: Each cut It is thin and smooth on both sides, and does not peel off at the intersection of the cut and the square at a glance. 9 points: Cuts are slightly thicker. Eight points: There was slight peeling at the intersection of the cuts, and there was no peeling at a glance of the square, and the area of the defective portion was within 5% of the area of the entire square. 7 points: Peeling was found on both sides of the cut and at the intersection, and the area of the defect was within 5% of the total square area. 6 points: Peeling was found on both sides of the cut and the intersection, and the area of the defective portion was 5 to 15% of the total square area. 5 points: The width of peeling due to cuts is wider than “6 points”, and the area of the defective portion is 15 to 25% of the area of the entire square. 4 points: The width of the peeling due to the cut is wide, and the area of the defective portion is 25 to 35% of the total square area. 3 points: Each square was peeled at a glance, and its area was within 35% of the total square area. 2 points: Peeling due to cuts is larger than “3 points”, and the area of the defective portion is 35 to 50% of the area of the entire square. 1 point: Peeling due to cuts is larger than "2 points", and its area is 50 to 70% of the total square area. 0 point: The area of peeling is 70% or more of the area of all squares.

[0089]

[Table 3]

According to Table 3, the anticorrosive paint “OT-1” was used.
-"OT-7" has anticorrosion performance equal to or higher than that of the tar epoxy-based heavy anticorrosion paint.

[Overcoating Test] (Adhesion test with various overcoating paints) A spray paint was applied to a sandblasted 70 × 150 × 2.3 mm steel plate by air spraying so that the dry film thickness was 200 μm. After the application, an outdoor exposure table (JIS) was installed at Otake Research Center, China Paint Co., Ltd. in Otake City, Hiroshima Prefecture.
K5400 9.9) according to Table 4.
The above-mentioned various top coatings were applied using an air spray so that the dry film thickness became 50 μm, and dried at 20 ° C. for 7 days to obtain test plates.

After the test plate was immersed in a 3% saline solution at 20 ° C. for 90 days, the adhesion to various overcoats was checked in the same manner as described above by the cross-cut tape method (according to JIS K 5400 8.5.2.)
Was evaluated. Table 4 shows the results.

[0093]

[Table 4]

In the “H-1” system of Table 4, discoloration (browning) of the overcoat film was observed. Anti-corrosion paint "OT-1"
-"OT-7" is excellent in various overcoating properties.

[Production of non-organic tin-based hydrolyzable antifouling paint]
Each antifouling paint composition having the composition shown in Table 5 was produced (the amount of each component is shown in parts by weight). In producing the antifouling coating composition having the composition shown in Table 5, these ingredients were shaken together for 2 hours in a paint shaker containing glass beads, and then aged at room temperature for 12 hours. Next, the mixture was filtered through a 100-mesh filter to obtain a desired non-organic tin-based hydrolyzable antifouling paint composition.

[0096]

[Table 5]

The names of the components in Table 5 are as follows. "S-3 varnish": trialkylsilyl ester copolymer solution Monomer composition in polymer: tributylsilyl methacrylate / methyl methacrylate = 50/50 (weight ratio) Solvent: xylene Heat residue: 49.6% by weight Viscosity: 259 cPs / 25 ° C “BL-1 varnish”: acrylic styrene copolymer solution Monomer composition in polymer: isobutyl methacrylate / t-butyl methacrylate / styrene / stearyl methacrylate = 30/30/30/10 (weight ratio) Heating residue : 50% by weight Viscosity: A ₄ (Gardner / 25 ° C) "TOYOPARAX 150" (trade name): Tosoh Corporation
Chlorinated paraffin, average carbon number: 14.5, chlorine content: 50%, viscosity: 12 poise / 25 ° C, specific gravity: 1.
25/25 ° C "Mica Shiratama" (trade name): scale pigment made by Wakimoto Mica, average particle size: 15 m, aspect ratio: 40 "Molecular sieve 4A" (trade name): dehydrating agent, union Showa ( Co., Ltd., synthetic zeolite powder "Dispalon 305" (trade name): Kusumoto Kasei Co., Ltd.
-Made hydrogenated castor oil-based sagging inhibitor "DISPARON 4200-20" (trade name): polyethylene oxide-based anti-settling agent manufactured by Kusumoto Kasei Co., Ltd., 20% xylene paste

[Test for Adhesion to Antifouling Paint] After applying a test paint (primer) to a sandblasted 70 × 150 × 2.3 mm steel plate using an air spray so that the dry film thickness is 200 μm. After 10 days of outdoor exposure, it was installed on an outdoor exposure table (based on JIS K5400 9.9) installed at the Ohtake Research Center of Chugoku Paint Co., Ltd.
A non-organic tin-based hydrolyzable antifouling paint (AF-1, AF-2) was applied using an air spray to a dry film thickness of 100 μm, and dried at 20 ° C. for 7 days to obtain a test plate.

After the test plate was immersed in natural seawater for 180 days, the adhesion between the test primer and the non-organic tin-based hydrolyzable antifouling paint was measured by a cross-cut tape method (JIS K5400 8.
(Based on 5.2). Table 6 shows the results.

[0100]

[Table 6]

[Anti-fouling property and degree of wear in anti-fouling paint coating system]
A 70 × 20 × 3 mm sand blast plate was prepared which was bent so that it could be attached to the side of a rotating drum placed in the seawater of Hiroshima Bay.

The primer was coated on the sand blast plate with an air spray to a dry film thickness of 200 μm and dried at 20 ° C. for 2 days. The coating was applied using an applicator to a thickness of 200 μm, and dried at 20 ° C. for 7 days to obtain a test plate.

As a comparison with the coating method of the present invention, a conventional coating method was performed as follows. That is, a tar-epoxy two-component anticorrosive paint (trade name: Viscon AC, manufactured by China Paint Co., Ltd.) was applied to this sand blast plate using an air spray so as to have a dry film thickness of 150 μm, and dried at 20 ° C. for 2 days. Thereafter, a vinyl-based binder coat (manufactured by Chugoku Paint Co., Ltd., trade name: Sylvax SQK) was applied using an air spray to a dry film thickness of 50 μm, dried at 20 ° C. for 2 days, and then treated with non-organic tin. The system hydrolyzable antifouling paint was applied using an applicator so that the dry film thickness became 200 μm, and dried at 20 ° C. for 7 days to obtain a test plate.

These test plates were attached to a rotating drum, and the peripheral speed was 15 knots, and 50% operating conditions (12 hours operation at night,
After simulating the operation of the ship for 12 months in 12 hours during the daytime alternate operation, the antifouling property (dynamic antifouling property, the area% of various aquatic organisms adhering to the test plate), the degree of consumption (decrease in film thickness) (Μm)).

Tables 7 and 8 show the results.

[0106]

[Table 7]

[0107]

[Table 8]

As understood from Tables 7 and 8,
"OT-1" to "OT-7" can provide a coating system having antifouling property and wear degree equal to or higher than that of the conventional method without using a binder coat required in the conventional method.

[Effects of Reducing the Number of Coatings, Paint Type, and Thinner Type] The coating method of the present invention was compared with a conventional coating method. The labor savings in the painting process were compared at the bottom of a newly built ship with a 75,000 ton bulk carrier as shown in Table 9 below.
The non-organic tin-based hydrolyzable antifouling paint was applied to the water line part for two years, and compared.

[0110]

[Table 9]

[Example of Streamlining the Painting Process According to the Present Invention]
In the case of coating the outer plate portion of a 75,000 ton bulk carrier constructed as a new ship with the above specifications, the degree of rationalization in each of the following items was compared with the conventional coating method-1.

The value of the rationalization degree is 1 in comparison with the conventional coating method-1.
The numerical value of the coating method of the present invention was calculated as 00. 1. Painting work time Airless spray was used to calculate the time required for paint spraying (including travel time on scaffolds and aerial work vehicles), excluding preparation of painting equipment. 2. Ineffective work Switching of paint and associated cleaning of painting equipment and painting equipment Spray wrap management and curing necessary for jointing different kinds of paint Movement of workers, preparation of painting, cleaning up, etc. Calculated for non-valid work. 3. Painting mistakes We calculated paint mistakes due to paint selection mistakes, spray mistakes at the joints of different paints, and thinner selection mistakes. 4. Process management work Efforts related to the management of coating intervals between paints, the management of coordination with processes other than the coating department (construction and movement of blocks), and the management of the arrangement of workers were calculated. 5. Paint storage / management work The management work related to the ordering of paints / thinners, entry / exit, and sorting / sorting storage was calculated. 6. Paint / thinner loss, waste paint / waste thinner treatment work Increase in paint that cannot be used due to overuse of paint caused by paint, thinner loss, spray wrap of different paint, etc. when switching paints, pot life over of remaining paint, etc. And the waste paint and waste thinner processing work generated by them were calculated.

Table 10 shows the calculation results.

[0114]

[Table 10]

As described above, the coating method using the coating material of the present invention makes it possible to streamline the coating process for a ship outer panel. * In addition to this, the rationalization is possible by using the non-tar epoxy resin anticorrosion paint in the present invention for the primer other than the outer plate. * In addition, since the skill of the painter is stabilized by increasing the painting area of the same paint, it is easy to obtain a uniform and high-quality paint film, and there is also an advantage that calculation is not possible, such as improvement of work efficiency.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08K 5/521 C08K 5/521 C08L 27/06 C08L 27/06 63/02 63/02

Claims (8)

[Claims] 1. A non-tar epoxy resin coating composition comprising (a) a bisphenol epoxy resin, (b) a vinyl chloride copolymer, and (c) a curing agent comprising polyamide or a modified product thereof. Stuff. 2. The coating composition according to claim 1, wherein the epoxy equivalent of the bisphenol type epoxy resin (a) component is from 100 to 500. 3. The coating composition according to claim 1, further comprising (d) aluminum powder in addition to the components (a), (b) and (c). 4. The vinyl chloride-based copolymer is a vinyl chloride-alkyl vinyl ether copolymer.
The coating composition according to any one of the above. 5. The coating composition according to claim 1, wherein the coating composition contains tricresyl phosphate. 6. The coating composition according to claim 1, which comprises a mixture of the polyamide or a modified product thereof and another curing agent as a curing agent. 7. The composition according to claim 1, which is used as a heavy-duty anticorrosion paint.
7. The coating composition according to any one of 6. 8. A heavy duty anticorrosion coating formed from the coating composition according to claim 1.