WO2019244996A1

WO2019244996A1 - Coating composition and method for forming coating film

Info

Publication number: WO2019244996A1
Application number: PCT/JP2019/024589
Authority: WO
Inventors: 圭太内川; 健二高口
Original assignee: 日本ペイント・インダストリアルコーティングス株式会社
Priority date: 2018-06-20
Filing date: 2019-06-20
Publication date: 2019-12-26
Also published as: CN112313299A; JP6517407B1; JP2019218486A

Abstract

The present invention addresses the problem of providing a coating composition which is capable of forming a coating film that is highly resistant to deterioration and wear due to the traffic of vehicles and the like, and which forms a coating film that has a long working lifetime. The present invention, which solves the above-described problem, is a coating composition that contains a solvent-free base material composition and a solvent-free curing agent composition. This coating composition is configured such that: the solvent-free base material composition contains a coating film forming resin, a pigment and an organic metal catalyst; the coating film forming resin contains at least one substance that is selected from among polyols and aromatic polyfunctional amines; the pigment contains at least one substance that is selected from the group consisting of carbonates, titanium oxide, zinc oxide, precipitated barium sulfate, talc, silica and kaolin; the solvent-free curing agent composition contains at least one substance that is selected from the group consisting of aliphatic polyfunctional isocyanate compounds and aromatic polyfunctional isocyanate compounds; and the ratio of the distance (L) between the surfaces of pigment dispersion particles to the average particle diameter (D) of the pigment dispersion particles in a coating film containing the coating composition, namely L/D is from 0.4 to 2.0 (inclusive).

Description

Paint composition and coating film forming method

The present invention relates to a coating composition and a method for forming a coating film using the coating composition.

塗膜 Since the road marking film is deteriorated and depleted due to the traffic of vehicles and the like, it is necessary to periodically perform maintenance such as repainting and repair using a coating composition for forming the road marking film.

As a coating composition for forming such a road marking coating film, there is an invention described in JP-A-2016-89036 (Patent Document 1). Patent Document 1 discloses a carbonic acid having a particle diameter of 100 to 2,000 μm. Disclosed is a road marking paint composition comprising an aqueous emulsion paint containing 30 to 60% by weight of calcium granules, silica sand, silica stone or ceramic granules.

Japanese Patent Application Laid-Open No. 2004-182917 (Patent Literature 2) discloses a road marking paint composition in which an inorganic filler (excluding a pigment) is blended in an emulsion-based water-based paint. Disclosed is an aqueous coating composition, wherein a hard inorganic filler having a Mohs' hardness of 5 or more is blended as a part of the material so as to impart abrasion resistance to a coated surface.

JP 2016-89036 A JP 2004-182917 A

Even when a coating film is formed from the coating compositions described in

Patent Documents

1 and 2, there has been a problem that abrasion of the coating film cannot be sufficiently suppressed.
On the other hand, in recent years, an automatic driving technique of a vehicle has been studied, and for example, it is assumed that the automatic driving of the vehicle is controlled based on information of a road marking film such as a white line. However, if the white line disappears due to deterioration or wear due to vehicle traffic, etc., there is a risk that problems may occur in automatic driving of the vehicle, and in order to further improve the accuracy of automatic driving, the coating for road marking Therefore, high durability such as wear resistance is required. Furthermore, high visibility is also required.

The present invention has been made to solve the above problems, and more specifically, a coating composition capable of forming a coating film that is resistant to deterioration and abrasion due to vehicle traffic and the like, and that forms a coating film having a long service life. The task is to provide.

In order to solve the above problems, the present invention provides the following aspects.
[1] a solvent-free base composition,
A solvent-free curing agent composition and a coating composition,
The solventless base composition includes a film-forming resin, a pigment and an organometallic catalyst,
The film-forming resin includes at least one selected from a polyol and an aromatic polyfunctional amine,
The pigment includes at least one selected from the group consisting of carbonate, titanium oxide, zinc oxide, precipitated barium sulfate, talc, silica, and kaolin,
The solventless curing agent composition comprises at least one selected from the group consisting of an aliphatic polyfunctional isocyanate compound and an aromatic polyfunctional isocyanate compound,
The ratio (L / D) of the distance (L) between the surfaces of the pigment-dispersed particles and the average particle diameter (D) of the pigment-dispersed particles in the coating film containing the coating composition is 0.4 to 2.0. There is a coating composition.
[2] Ratio of the equivalent of NCO groups contained in the solvent-free curing agent composition to the sum of equivalents of OH groups and NH ₂ groups contained in the solvent-free base composition [NCO / (OH + NH ₂ )] Is
The coating composition according to [1], which has a value of 0.5 or more and 2.0 or less.
[3] The coating composition according to [1] or [2], wherein the amount of the pigment is 5 parts by mass or more and 55 parts by mass or less based on 100 parts by mass of the solid content of the coating composition.
[4] The coating composition according to any one of [1] to [3], wherein the pigment dispersed particles of the pigment have an average particle diameter (D) of 0.2 μm or more and 50 μm or less.
[5] The coating composition according to any one of [1] to [4], wherein the carbonate is calcium carbonate.
[6] The coating composition according to [5], wherein the amount of the calcium carbonate is 5 parts by mass or more and 55 parts by mass or less based on 100 parts by mass of the solid content of the coating composition.
[7] The coating composition according to any one of [1] to [6], which is a road marking coating composition and / or a road heat shielding coating composition.
[8] Any one of [1] to [6], which is at least one selected from the group consisting of a coating composition for coating an inner surface of an iron pipe, a coating composition for coating an outer surface of an iron pipe, and a coating composition for coating the inner and outer surfaces of an iron pipe. 3. The coating composition according to item 1.
[9] The coating according to any one of [1] to [8], wherein a coating of a coating composition having a thickness of 200 μm has a wear amount of 120 mg or less in a wear resistance test based on JIS K 5600-5-9. Paint composition.
[10] applying the coating composition according to any one of the above [1] to [9] to an object to be coated;
Curing the paint composition after the application,
The coating is performed by at least one method selected from the group consisting of spray coating, slit coater coating, and flow coating,
Coating method.

であれば The coating composition of the present invention has excellent abrasion resistance and can form a coating film having a long service life. Further, the present invention can provide a coating composition having excellent two-liquid mixing properties. Since the coating composition of the present invention can sufficiently uniformly mix the solvent-free base composition and the solvent-free curing agent contained in the coating composition, the reaction proceeds sufficiently after coating on the road surface, and a tough coating film is formed. Can be formed. Therefore, it is possible to provide a coating composition having a longer service life than the conventional road marking paint.

FIG. 3 is a schematic cross-sectional view of a coating film, showing a relationship between a distance (L) between surfaces of pigment-dispersed particles and an average particle diameter (D) of pigment-dispersed particles.

(4) The process that led to the present invention will be described. The coating compositions disclosed in

Patent Documents

1 and 2 are water-based coating compositions, and the resulting coating films still do not have sufficient abrasion resistance and durability. Therefore, the coating composition disclosed in Patent Literature 1 may increase the number of recoatings due to abrasion, and cannot reduce maintenance costs.

Then, the present inventors aimed at developing a coating composition which can satisfy excellent abrasion resistance and durability. As a result of intensive studies, a coating composition containing at least one pigment selected from the group consisting of carbonate, titanium oxide, zinc oxide, precipitated barium sulfate, talc, silica, and kaolin as technical characteristics has been obtained. The ratio (L / D) between the distance (L) between the surfaces of the pigment-dispersed particles and the average particle diameter (D) of the pigment-dispersed particles in the coating film containing the coating composition is 0.4 to 2.0. It is as follows. The present inventors have found that the coating composition has excellent abrasion resistance and can form a coating film having a long service life, and have completed the present invention.
Further, the coating composition according to the present disclosure can provide a coating composition having excellent two-pack mixing properties, and can sufficiently uniformly mix the solvent-free base composition and the solvent-free curing agent contained in the coating composition. After the coating on the road surface, the reaction proceeds sufficiently to form a tough coating film.
Hereinafter, the coating composition of the present invention will be described.

The coating composition according to the present disclosure,
Solvent-free base composition,
A solvent-free curing agent composition and a coating composition,
The solventless base composition includes a film-forming resin, a pigment and an organometallic catalyst,
The film-forming resin includes at least one selected from a polyol and an aromatic polyfunctional amine,
The pigment includes at least one selected from the group consisting of carbonate, titanium oxide, zinc oxide, precipitated barium sulfate, talc, silica, and kaolin,
The solventless curing agent composition comprises at least one selected from the group consisting of an aliphatic polyfunctional isocyanate compound and an aromatic polyfunctional isocyanate compound,
The ratio (L / D) of the distance (L) between the surfaces of the pigment-dispersed particles and the average particle diameter (D) of the pigment-dispersed particles in the coating film containing the coating composition is 0.4 to 2.0. is there.

Regarding the ratio (L / D) between the distance (L) between the surfaces of the pigment-dispersed particles and the average particle diameter (D) of the pigment-dispersed particles, the distance between the surfaces of the pigment-dispersed particles in the coating film containing the coating composition according to the present disclosure. The ratio (L / D) between (L) and the average particle diameter (D) of the pigment-dispersed particles is 0.4 or more and 2.0 or less.
The composition according to the present disclosure has a ratio (L / D) of the distance between the surfaces of the pigment dispersed particles (L) and the average particle diameter of the pigment dispersed particles (D) within such a numerical range. The coating composition according to the present disclosure can provide higher durability.
Further, it can be appropriately prepared according to the coating conditions required according to the object to be coated, the coating conditions and the like. For example, the viscosity can be prevented from becoming too high, and the two-component mixing properties of the solvent-free base composition and the solvent-free curing agent composition are excellent. If the two-component mixing property is excellent, the reaction proceeds sufficiently after coating on the road surface, and a tough coating film can be formed.
Further, the coating film can be provided with toughness, and can have excellent wear resistance and durability.
Further, when (L / D) is within the above range, a highly durable coating film can be obtained, for example, in an embodiment using a pigment having a Mohs hardness of less than 5, and in some embodiments, a Mohs hardness of 3 or less. Therefore, even if a hard pigment having a Mohs hardness of 5 or more is not contained, a highly durable coating film can be obtained, so that the choice of materials increases and inexpensive production becomes possible.
Furthermore, when (L / D) is within the above range, the coating film may have good black-and-white hiding properties. For example, pigments having a Mohs hardness of less than 5 include carbonate (calcium carbonate), zinc oxide, precipitated barium sulfate, talc, and kaolin.

The ratio (L / D) of the distance between the surfaces (L) of the pigment-dispersed particles and the average particle diameter (D) of the pigment-dispersed particles in the coating film containing the coating composition according to the present disclosure is 0.4 or more. 0 or less, for example, 0.45 or more and 1.95 or less. As long as (L / D) according to the present disclosure is within a range of 0.4 or more and 2.0 or less, a lower limit and an upper limit can be appropriately set within this range.
In one aspect, (L / D) is 0.45 or more, for example, 0.5 or more, 0.65 or more, for example, 0.7 or more, and in another aspect, It may be 0.75 or more. By having such an (L / D) value, the coating film can have more excellent black-and-white opacity, in addition to the various effects described above.
On the other hand, in one embodiment, (L / D) is 1.95 or less, for example, 1.8 or less. In one embodiment, (L / D) is 1.5 or less, for example, 1.0 or less; .9 or less. In the present disclosure, the values may be within these numerical ranges. By having such a (L / D) value, the above-described various effects can be obtained.
In one embodiment, (L / D) is 0.45 or more and 1.8 or less, for example, 0.45 or more and 1.5 or less.

Here, FIG. 1 is a schematic cross-sectional view of the coating film, showing the relationship between the distance (L) between the surfaces of the pigment dispersed particles and the average particle diameter (D) of the pigment dispersed particles. FIG. 1 shows an embodiment in which pigment particles 2 are arranged in a coating film 1 in a simple cubic lattice. In FIG. 1, the diameter of the pigment is shown large for the sake of explanation.
In the present disclosure, the value of the ratio (L / D) of the distance (L) between the surfaces of the pigment-dispersed particles in the coating film and the average particle diameter (D) of the pigment-dispersed particles can be derived as follows. .
The average particle size (D) of the pigment-dispersed particles means the volume-average particle size (D50) of the pigment-dispersed particles. For example, a particle size measuring device such as a laser diffraction type particle size distribution measuring device SALD-2200 (manufactured by Shimadzu Corporation). Can be measured using
The distance between the surfaces (L) of the pigment-dispersed particles is calculated from the measured average dispersed-particle diameter (D50), the amount and the specific gravity, assuming that the pigment-dispersed particles are arranged in a simple cubic lattice in the coating film. You can ask.

において In the present disclosure, various pigments may be mixed, and the pigments may be non-uniformly dispersed. In any of the embodiments, the average particle diameter (D) of the pigment-dispersed particles and the average inter-surface distance (L) of the pigment-dispersed particles can be calculated by the above method or a known method. For example, the value of (L / D) in a coating film having a dry coating film thickness of 200 μm may be calculated.

In one embodiment, the pigment according to the present disclosure may be spherical, substantially spherical, granular, or the like, and is spherical or substantially spherical to maintain coating strength. By being spherical or substantially spherical, higher durability can be imparted. In addition, it is possible to appropriately prepare a coating composition suitable for coating conditions required according to an object to be coated, coating conditions, and the like, and it is possible to improve work efficiency.
In addition, the coating composition may include a pigment having a spherical shape, a substantially spherical shape, a granular shape, or the like and a flat pigment, or may include the flat pigment alone, without departing from the scope according to the present disclosure. In embodiments involving flat pigments, (L / D) can be derived using known methods.

Solvent-free base composition The solvent- free base composition contains a film-forming resin, a pigment, and an organometallic catalyst.
Since the coating composition of the present disclosure includes the solvent-free base composition, the base composition does not include volatile components. Therefore, no odor is generated and the load on the environment can be reduced. Furthermore, the composition according to the present disclosure has better weather resistance than a coating composition containing a solvent such as an aqueous solvent and an organic solvent, and can form a coating film having toughness. Also suitable for coating compositions.

Film-Forming Resin The film-forming resin according to the present disclosure includes at least one selected from a polyol having two or more hydroxyl groups and an aromatic polyfunctional amine. In one embodiment, the film-forming resin contains at least one selected from the group consisting of a polyol having two or more hydroxyl groups and an aromatic diamine.

The polyol having two or more hydroxyl groups is not particularly limited. To facilitate the use of the resulting coating composition as a solvent-free viscosity, for example, the number average molecular weight is 50 or more and 3,000 or less, and in one embodiment, 50 or more and 1,000 or less, For example, it is 500 or more and 1,000 or less. In addition, in this specification, the number average molecular weight is a value converted into polystyrene by gel permeation chromatography (GPC).

For example, the hydroxyl value of the polyol is from 50 mgKOH / g to 2,000 mgKOH / g. When the hydroxyl value is within such a range, a coating film having sufficient strength can be obtained. Further, a coating film having flexibility can be formed.
In one embodiment, the hydroxyl value of the polyol is 50 mgKOH / g to 1,500 mgKOH / g, for example, 50 mgKOH / g to 500 mgKOH / g, and in one embodiment, 50 mgKOH / g to 350 mgKOH / g.
In the present specification, the hydroxyl value indicates a hydroxyl value of a solid content, and can be measured in accordance with JIS K0070.

The polyol can include at least one selected from the group consisting of polyether polyols, polyester polyols, acrylic polyols, and castor oil-based polyols.

Moreover, polyether diol, polyester diol, polycarbonate diol and the like can be exemplified. For example, polyalkylene glycols such as polyethylene glycol, polypropylene glycol, polyethylene propylene glycol, polytetramethylene ether glycol, polyhexamethylene ether glycol, polyoctamethylene ether glycol, polyethylene adipate, polybutylene adipate, polyhexamethylene adipate, polyneopentyl Polyester diol such as adipate, poly-3-methylpentyl adipate, polyethylene / butylene adipate, polyneopentyl / hexyl adipate, polylactone diol such as polycaprolactone diol, poly-3-methylvalerolactone diol, polyhexamethylene carbonate diol, etc. Polycarbonate diols, castor oil-based polyols and their modifications And it can be exemplified mixtures thereof.

In some embodiments, the polyol is a castor oil-based polyol. Since the solvent-free base composition according to the present invention contains a castor oil-based polyol, a coating composition having a relatively low viscosity can be obtained. The castor oil-based polyol is not particularly limited, and examples thereof include castor oil and derivatives thereof, for example, diglycerides and monoglycerides of castor oil fatty acids, and mixtures thereof. By using a castor oil-based polyol, a low-viscosity solventless base composition and a solventless curing agent composition can be mixed and sufficiently mixed.

In some embodiments, the polyol is ethylene glycol, propylene glycol, butane glycol, hexanediol, methylpentanediol, neopentyl glycol, polyethylene glycol, tetramethylene ether glycol, hexamethylene ether glycol, glycerin, pentaerythritol, dipentaerythritol, sorbitol And polyhydric alcohols such as inositol, mannitol, glucose and fructose.

In one embodiment, the acrylic polyol is obtained by polymerization of a radically polymerizable unsaturated monomer composition. As the radical polymerizable unsaturated monomer, a mixture of a hydroxyl group-containing radical polymerizable unsaturated monomer required for obtaining the above hydroxyl value and other monomers can be used. The hydroxyl group-containing radically polymerizable unsaturated monomer is not particularly limited, and includes, for example, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and the like. These may be used alone or in combination. Good. Other radically polymerizable monomers are not particularly limited, and include, for example, styrenes such as styrene and α-methylstyrene; methyl acrylate, ethyl acrylate, propyl acrylate, -n, i, and t-butyl acrylate And acrylates such as 2-ethylhexyl acrylate and lauryl acrylate; methyl methacrylate, ethyl methacrylate, propyl methacrylate, -n, i and t-butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate and the like Methacrylates.

The acrylic polyol can be converted into an acrylic polyol by performing a polymerization reaction without a solvent or in the presence of an appropriate organic solvent and removing the solvent.
For example, as the polymerization initiator, an initiator known in the art as a radical polymerization initiator can be used. For example, examples of the polymerization initiator include organic peroxides such as benzoyl peroxide, t-butyl peroxide and cumene hydroperoxide, and organic azo compounds such as azobiscyanovaleric acid and azoisobutyronitrile.

The polymerization can be performed at a temperature of 80 to 140 ° C. for 1 to 8 hours by an operation well known to those skilled in the art. For example, polymerization can be performed by dropping a radical polymerizable monomer and a polymerization initiator into a heated organic solvent. The organic solvent used for the polymerization is not particularly limited, but preferably has a boiling point of about 60 to 250 ° C. Suitable organic solvents include water-insoluble organic solvents such as butyl acetate, xylene, toluene, methyl isobutyl ketone, propylene glycol, dipropylene glycol dimethyl ether and methyl ether acetate; and tetrahydrofuran, ethanol, methanol, propanol and isopropanol. , 2-butanol, t-butyl alcohol, dioxane, methyl ethyl ketone, ethylene glycol, ethylene glycol monobutyl ether, 2-methoxypropanol, 2-butoxypropanol, diethylene glycol monobutyl ether, butyl diglycol, N-methylpyrrolidone, ethylene carbonate and propylene carbonate And a water-soluble organic solvent such as

Aromatic polyfunctional amine The aromatic polyfunctional amine is an aromatic amine having two or more amino groups in one molecule, and is not particularly limited.
In one embodiment, the aromatic compound is a compound in which a hydrogen atom of an aromatic ring is substituted with two or more amino groups. For example, diaminotoluene (also referred to as phenylenediamine) and triaminobenzene are mentioned. The aromatic polyfunctional amine has at least one selected from the group consisting of a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, and a decyl group. It may have two alkyl groups.

In one embodiment, the aromatic polyfunctional amine is diethyldiaminotoluene, 4,4′-diamino-3,3′-dichlorodiphenylmethane, 2,4-diaminotoluene, 2,6-diaminotoluene, 3,4-diaminotoluene , 1-methyl-3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene (both are referred to as diethyltoluenediamine or DETDA), 4 , 4'-diamino-3,3'-diethyl-5,5'-dimethylphenylmethane (MEDDM), 1,3,5-triethyl-2,6-diaminobenzene, 4,4'-diaminodiphenylmethane, 5,3 ', 5'-tetraethyl-4,4'-diaminodiphenylmethane, 3,5-dimethylthio-2,4-toluenediamine, 3,5-di Chiruchio-2,6-toluene diamine, and the like can be given. These may be used alone or in combination of two or more.
In some embodiments, the aromatic polyfunctional amine is diethyldiaminotoluene, 4,4'-diamino-3,3'-dichlorodiphenylmethane, and mixtures thereof.

In one embodiment, examples of the aromatic polyfunctional amine include 1,3,5-triaminobenzene and 1,2,4-triaminobenzene. These may be used alone or in combination of two or more.

In one embodiment, the aromatic polyfunctional amine is an aromatic polyfunctional amine based on diaminodiphenylmethane, an aromatic polyfunctional amine based on phenylenediamine, an aromatic polyfunctional amine based on bisaminophenylfluorene, or an aromatic polyfunctional amine based on diaminodiphenyl ether. Functional amines (eg, 4,4′-diaminodiphenyl ether), diaminonaphthalene-based aromatic polyfunctional amines, diaminobenzophenone-based aromatic polyfunctional amines, and the like.

In the aromatic polyfunctional amine, for example, the amine value is from 100 mgKOH / g to 1,200 mgKOH / g, and may be from 200 mgKOH / g to 800 mgKOH / g.
When the amine value is within such a range, desired short-time curing can be achieved, and a tough coating film can be formed. Furthermore, since the pot life of the coating composition, for example, the road marking coating composition, the coating composition for coating the inner surface of the iron pipe, the coating composition for coating the outer surface of the iron pipe, and the coating composition for coating the inner and outer surface of the iron pipe can be adjusted to a desired range. Excellent workability of the coating composition. In addition, in this specification, an amine value represents the solid content amine value, and can be measured in accordance with the provisions of JIS K 7237.

塗膜 The film-forming resin contained in the solvent-free curing agent composition is a combination of one or more compounds among polyols, aromatic polyfunctional amines, and the like. Of these, polyols are preferred.

For example, as commercially available aromatic polyfunctional amines, diaminodiphenylmethane (Iharacuamine MT, Cure Hard-MED, both manufactured by Kumiai Chemical), phenylenediamine (Ethacure 100, Albemare), bisaminophenyl Fluorene (BAFL, manufactured by JFE Chemical), diaminodiphenyl ether (4,4'-diaminodiphenyl ether, manufactured by JFE Chemical), diaminonaphthalene aromatic polyfunctional amine, diaminobenzophenone aromatic polyfunctional amine, etc. No.

In the coating composition of the present invention, the solvent-free base composition and the solvent-free curing agent composition described below are equivalent to the NCO group equivalent contained in the solvent-free curing agent composition and the OH contained in the solvent-free base composition. The ratio [NCO / (OH + NH ₂ )] of the group equivalents and the total of the NH ₂ group equivalents is 0.5 or more and 2.0 or less, for example, 0.7 or more and 1.7 or less, and in some embodiments, , 0.8 or more and 1.6 or less. [NCO / (OH + NH ₂ )] may be 0.8 or more and 1.55 or less.
When the relationship of [NCO / (OH + NH ₂ )] is within the above range, the coating film can be sufficiently cured, a tougher coating film can be obtained, and the coating film has excellent wear resistance and durability. Can be provided.

Pigment The pigment according to the present invention contains at least one selected from the group consisting of carbonate, titanium oxide, zinc oxide, precipitated barium sulfate, talc, silica, and kaolin. Further, shell powder, egg shell calcium, hollow particles and the like may be used. For example, it may include at least one selected from the group consisting of carbonate, titanium oxide, and talc, and may include a plurality of types of carbonate.
By including such a pigment, the coating film formed from the coating composition of the present invention can exhibit white. For example, in one embodiment, the road marking paint composition can be used to form a white coating film, for example, a white line coating film.
In one embodiment, the pigment comprises a carbonate and titanium oxide, and may optionally further comprise at least one selected from the group consisting of zinc oxide, precipitated barium sulfate, talc, silica and kaolin. By including such a combination of pigments, the coating film formed from the coating composition of the present invention can exhibit white. Further, the above-described effects can be obtained more favorably.

The carbonate is, for example, at least one selected from the group consisting of calcium carbonate, magnesium carbonate, iron (II) carbonate, and dolomite (CaMg (CO ₃ ) ₂ ). In some embodiments, the carbonate is calcium carbonate. In some embodiments, the calcium carbonate includes at least one selected from the group consisting of heavy calcium carbonate and light calcium carbonate. Here, although not to be interpreted as being limited to a particular theory, the coating composition according to the present invention includes at least one selected from the group consisting of heavy calcium carbonate and light calcium carbonate, Despite having a lower Mohs hardness than carbonate, the coating film formed from the coating composition not only satisfies excellent abrasion resistance and durability, but also easily disperses during the production of the coating composition. become.

In one embodiment, the pigment is bentonite, smectite, glass flake (silica filler) in addition to at least one selected from the group consisting of carbonate, titanium oxide, zinc oxide, precipitated barium sulfate, talc, silica, and kaolin. , Iron oxide, acicular titanium oxide, quinophthalone, anthraquinone, benzimidazolone and bismuth vanadate, isoindoline pigment, isoindolinone pigment, carbon black, dioxazine pigment, indanthrene pigment, copper phthalocyanine, chlorine Copper phthalocyanine bromide, brominated copper phthalocyanine, perylene pigments, diketopyrrolopyrrole pigments, and azo pigments may be included.
In one embodiment, the loading of the carbonate is less than the loading of titanium oxide.

In one embodiment, the amount of the pigment is 5 parts by mass or more and 55 parts by mass or less based on 100 parts by mass of the solid content of the coating composition. By being in such a range, a coloring film having a sufficient coloring power can be formed, and further, the coating composition can be suppressed from having a high viscosity, and has excellent mixing properties with a curing agent, so that it is tough. Does not hinder film formation. When a plurality of types of pigments are used, the amounts of the pigments are sums.

In one embodiment, the amount of the carbonate, for example, calcium carbonate is 5 parts by mass or more and 55 parts by mass or less with respect to 100 parts by mass of the solid content of the coating composition. It is 10 parts by mass or more and 45 parts by mass or less with respect to parts by mass.

In some embodiments, the pigment comprises calcium carbonate, and in some embodiments, calcium carbonate and talc. The coating compositions of the present disclosure in embodiments that include calcium carbonate can exhibit better abrasion resistance.
For example, when the coating composition contains both calcium carbonate and talc, the total amount of calcium carbonate and talc is 5 parts by mass or more and 55 parts by mass or less based on 100 parts by mass of the solid content of the coating composition. In one embodiment, the amount is from 10 parts by mass to 30 parts by mass, for example, from 10 parts by mass to 20 parts by mass.
When the total amount of calcium carbonate and talc is within such a range, the coating composition can be prevented from having a high viscosity, and has excellent mixing properties with a curing agent, thereby inhibiting formation of a tough coating film. do not do. Also, the coating can have excellent wear resistance.

When the coating composition contains both calcium carbonate and talc, the relationship between the amount of calcium carbonate and the amount of talc is [calcium carbonate / (calcium carbonate + talc)] = 0.1 or more and less than 1.0. Yes, for example, 0.4 or more and less than 1.0, for example, 0.4 or more and 0.9 or less, for example, 0.5 or more and 0.9 or less. By being within such a numerical range, a coating film having excellent wear resistance can be formed.
In one embodiment, the pigment comprises calcium carbonate as a carbonate, and further comprises talc, wherein the relationship between the amount of the calcium carbonate and the amount of the talc is:
[Calcium carbonate / (calcium carbonate + talc)] = 0.6 or more and 1.0 or less.
Also in this embodiment, it can be appropriately selected from the above numerical range.
In some embodiments, the amount of calcium carbonate is greater than the amount of talc. In this embodiment, [calcium carbonate / (calcium carbonate + talc)] is greater than 0.5 and less than 1.0. When the amount of calcium carbonate is larger than the amount of talc, durability can be increased.
On the other hand, depending on the purpose of use and application, although higher durability is required as compared with the conventional coating composition, the amount of calcium carbonate is larger than the amount of talc compared with the abrasion resistance of the coating film obtained in an embodiment. Thus, a slightly weaker abrasion resistant coating may be sufficient. In such a case, the amount of talc may be greater than the amount of calcium carbonate. In this embodiment, for example, a coating film having a longer durability than a coating film obtained from a known coating composition can be formed. In this embodiment, [calcium carbonate / (calcium carbonate + talc)] may be 0.1 or more and less than 0.5. The amounts of calcium carbonate and talc are based on mass.

The aspect ratio of the pigment is, for example, thickness: diameter = 1: 1 to 5: 1, and in one embodiment, 1: 1 to 4: 1. When the aspect ratio of the pigment is in such a range, the ratio (L / D) of the distance (L) between the surfaces of the pigment-dispersed particles and the average particle diameter (D) of the pigment-dispersed particles is L / D = 0. .4 to 2.0. Further, it is possible to suppress the viscosity of the coating composition from becoming too high, and to form a tougher coating film. In addition, a coating film having excellent black-and-white hiding properties can be formed in a well-balanced manner.

In one embodiment, the average particle diameter (D) of the pigment-dispersed particles is 0.2 μm or more and 50 μm or less, and in some embodiments 3 μm or more and 35 μm or less.
For example, the average particle diameter (D) of the dispersed particles of the pigment is 0.2 μm or more and 50 μm or less, and in some embodiments, 3 μm or more and 35 μm or less. When the average particle diameter of the pigment dispersed particles is in such a range, the ratio (L / D) of the distance between the surfaces (L) of the pigment dispersed particles and the average particle diameter (D) of the pigment dispersed particles is 0. .4 to 2.0.
In one embodiment, for example, the pigment contains a carbonate, and the average particle diameter (D) of the dispersed particles of the pigment containing the carbonate may be in the above numerical range, and the above-described effects can be obtained.
Further, it is possible to suppress the viscosity of the coating composition from becoming too high, and to form a tougher coating film. In addition, a coating film having excellent black-and-white hiding properties can be formed in a well-balanced manner.
In the case where the coating composition contains a plurality of pigment types, the average particle diameter (D) is obtained by measuring the average particle diameter (D50) of the pigment mixture, and using the value as the average particle diameter (D) of the pigment-dispersed particles. . The specific gravity in the case where the coating composition contains a plurality of pigment types was a value converted from the specific gravity and the compounding ratio of the pigment.

Organometallic Catalyst The solvent-free base composition according to the present invention contains an organometallic catalyst. The organometallic catalyst is not limited as long as it can contribute to the curing of the solvent-free base composition according to the present invention. For example, known ones can be used. In one embodiment, the organometallic catalyst can use an ester compound such as tin, lead, bismuth, zinc, and titanium. Specifically, for example, dibutyltin dilaurate, bismuth tris (2-ethylhexanoate), lead octylate, bismuth octoate and the like can be mentioned. Tin esters and / or bismuth esters are preferred as organometallic catalysts.

When a tin ester such as dibutyltin dilaurate is used as the organometallic catalyst, it is preferably contained in a proportion of 0.01 to 2% by mass based on the total amount of the solvent-free base composition. With such an addition amount, the reactivity of the coating composition can be adjusted within a desired range. For example, even if the solventless curing agent composition has relatively low reactivity as a curing agent, the reactivity of the coating composition can be increased. In addition, the reactivity with water can be suppressed, and foaming of the coating composition can be suppressed. Further, the workability of the coating composition can be improved.

Dehydrating agent The solvent-free base composition according to the present invention may further contain, for example, a dehydrating agent. By including a dehydrating agent, the moisture adhering to the painted surface, and a solvent-free curing agent composition described below, for example, can further suppress the generation of carbon dioxide due to the reaction with an aliphatic polyfunctional isocyanate, on the coating film Generation of unevenness and porosity can be further suppressed. The dehydrating agent is not particularly limited, and a known dehydrating agent can be used. For example, molecular sieves of synthetic zeolite, calcium sulfate, calcium oxide and the like can be mentioned. The amount of the dehydrating agent is, for example, 0.3 parts by mass or more and 5 parts by mass or less based on 100 parts by mass of the solid content of the coating composition. When the content is within such a range, water that can be contained in the coating composition can be sufficiently dehydrated, and foaming of the coating composition can be suppressed.
On the other hand, in some embodiments, a dehydrating agent may not be included. The dehydrating agent may not be included as long as no water adheres to the road surface or the amount of water is such that the reaction of the solvent-free base composition is not adversely affected. If the embodiment does not include a dehydrating agent, the production process can be shortened, and in addition, excellent abrasion resistance can be obtained.

Solvent-free curing agent composition The solvent-free curing agent composition contains at least one selected from the group consisting of aliphatic polyfunctional isocyanate compounds and aromatic polyfunctional isocyanate compounds.
The aliphatic polyfunctional isocyanate compound is not particularly limited. For example, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, cyclohexane-1,4-diisocyanate, dicyclohexylmethane-4,4-diisocyanate, methylcyclohexane diisocyanate, isophorone diisocyanate, dicyclohexylmethane Examples include diisocyanate. Further, these modified products may be used.

The aromatic polyfunctional isocyanate compound is not particularly limited, and examples thereof include tolylene diisocyanate, diphenylmethane diisocyanate (MDI), and xylylene diisocyanate. Further, these modified products may be used.

In some embodiments, the solventless curing agent composition comprises an aliphatic polyfunctional isocyanate. Aliphatic polyfunctional isocyanates can suppress discoloration due to weather resistance deterioration. For example, the aliphatic polyfunctional isocyanate is hexamethylene diisocyanate or a modified product thereof.
The aliphatic polyfunctional isocyanate and the aromatic polyfunctional isocyanate may be in the form of a burette, isocyanurate, alphanate or adduct thereof. Further, the solventless curing agent composition may contain an aliphatic polyfunctional isocyanate compound alone or in combination of two or more.

In the coating composition of the present invention, the amount of solvent-free curing agent composition, the equivalent of NCO groups contained in the solvent-free curable composition, of equivalent weight and NH ₂ groups of the OH groups contained in the solvent-free base resin composition It can be adjusted appropriately so that the ratio of the equivalent to the total is within a predetermined range, that is, [NCO / (OH + NH ₂ )] = 0.5 or more and 2.0 or less.

Additives In addition to the above-mentioned components, the coating composition of the present invention may further include aggregates (sand, etc.), silica, reflectors, matting agents such as alumina, surface modifiers, viscosity modifiers, preservatives, fungicides, It may contain additives such as a foaming agent, a dispersant, a light stabilizer, an ultraviolet absorber, a wax, a dehydrating agent, a leveling agent and an antioxidant, which are blended in the coating composition. These additives can be contained in at least one of the solvent-free base composition and the solvent-free curing agent composition. In addition, these amounts can be appropriately adjusted without impairing the effects of the present invention.

The coating composition of the present invention is, in one embodiment, a coating composition selected from a road marking coating composition and a road heat shielding coating composition. If desired, it may include known thermal barrier components.
In one embodiment, the coating composition of the present invention is a white road marking coating composition and / or a road surface heat shielding coating composition, and can be used, for example, for white lines on a road surface.

In one embodiment, the coating composition of the present invention includes at least one selected from the group consisting of a coating composition for coating an inner surface of an iron pipe, a coating composition for coating an outer surface of an iron pipe, and a coating composition for coating the inner and outer surfaces of an iron pipe. One kind. The coating composition of the present invention has a viscosity excellent in coatability, and the resulting coating film has excellent abrasion resistance. It can also be applied to iron pipes, for example, such as steel pipes, for which reduction of the amount of steel is required.

Here, in one embodiment, the term “excellent in abrasion resistance” in the present disclosure means that the amount of wear in a 200 μm-thick coating film of a coating composition in a wear resistance test based on JIS K 5600-5-9 is determined. Means less than the conventional road marking paint composition (210 mg), in one embodiment it is 120 mg or less, for example 80 mg or less, for example 50 mg or less, and in another embodiment it is 45 mg or less. For example, the wear amount may be 40 mg or less, or 38 mg or less, and in one embodiment, may be 30 mg or less.
On the other hand, the amount of wear is 5 mg or more in one embodiment, for example, 10 mg or more.
The wear amount may be, for example, 5 mg or more and 120 mg or less, for example, 5 mg or more and 50 mg or less, and in some embodiments, may be 5 mg or more and 45 mg or less, for example, 5 mg or more and 38 mg or less. In another embodiment, it may be from 5 mg to 30 mg. In the present disclosure, the wear amount may be referred to as a wear reduction.

Method for Preparing Coating Composition The method for preparing the coating composition according to the present disclosure is not particularly limited, and the above solvent-free base material composition, solvent-free curing agent composition, etc. are mixed and stirred, and if necessary, A method for dispersing an agent or the like can be exemplified. The stirring method is not particularly limited, and a disper or the like can be used. In addition, the dispersion method is not particularly limited, and devices generally used for dispersing pigments, such as a roll mill, a paint shaker, a pot mill, a disper, and a sand grind mill, can be used.

Coating object The coating composition according to the present disclosure can be applied to the surface of a pavement such as a road surface. The above-mentioned pavement is not particularly limited, and examples thereof include asphalt pavement and concrete pavement.
Further, the coating composition according to the present disclosure can be applied to the inner surface and the outer surface of an iron pipe. In one embodiment, the iron tube may include an iron component such as a steel tube.

Coating film forming method The coating film forming method according to the present disclosure is to apply a coating composition according to the present disclosure to an object to be coated,
Including curing the coating composition after coating, the coating is spray coating, a coating method using a static method, a coating method using a collision mixing method, at least one selected from the group consisting of slit coater coating and flow coating. Done by the method.
In one embodiment, the coating method of the coating composition according to the present disclosure includes a two-part collision-mixing spray coating in which two components of a solvent-free base composition and a solvent-free curing agent composition are mixed by collision and sprayed. Can be. In the two-liquid collision mixing spray coating, it is preferable to use a high-pressure two-liquid collision mixing spraying device. Furthermore, the solvent-free base composition and the solvent-free curing agent composition may be mixed immediately before coating, and the mixture may be applied using a coating machine such as a slit coater. Further, a method of continuously extruding the two liquids of the solvent-free base material composition and the solvent-free curing agent composition without air, a method of mixing with a static mixer, and a continuous spraying method can also be used.
For example, the coating amount of the coating composition can be appropriately adjusted so that the film thickness after drying and curing becomes 50 μm or more and 2,000 μm or less.
The drying conditions are not particularly limited, and for example, room temperature drying may be used. Further, forcible drying may be performed by using an infrared heater, a burner, or the like according to conditions such as an air temperature and a temperature of a coating object.
In one embodiment, the coating composition according to the present disclosure may be a cold-curable coating composition.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the examples, "parts" and "%" are based on mass unless otherwise specified.

(Solvent-free base composition)
The composition contained in the solvent-free base composition is as follows.
Film forming resin:
URIC-H368 (Castor oil-based polyol manufactured by Ito Oil; solid content hydroxyl value: 195 mgKOH / g, number average molecular weight: about 700)
URIC-H62 (Castor oil-based polyol manufactured by Ito Oil Co .; solid content hydroxyl value: 260 mg KOH / g, number average molecular weight: about 450)
URIC-H73X (Castor oil-based polyol manufactured by Ito Oil Co .; solid content hydroxyl value: 270 mgKOH / g, number average molecular weight: about 450)
Aromatic polyfunctional amine:
-EtaCure 100 (manufactured by Albemare Co., DETDA; solid content amine value: 629 mg KOH / g)
・ Curehard-MED (Kumiai Chemical Co., Ltd., MEDDM; solids amine value: 395 mgKOH / g)
Organometallic catalyst: TVS tin wax (Nitto Kasei Co., Ltd., dibutyltin laurate (DBTL))
Dehydrating agent: Zeolam A4 (Zeolite, manufactured by Tosoh Corporation)
Pigment:
・ Titanium oxide: Taipe CR-97 (manufactured by Ishihara Sangyo),
-Carbonate: Super 2000 (calcium carbonate, manufactured by Maruo Calcium)
-Carbonate: Sunlight SL2200 (calcium carbonate, manufactured by Takehara Chemical Industries)
・ Carbonates: Morigami white flour (calcium carbonate, manufactured by KISSHO)
-Carbonate: Unigross 3000 (calcium carbonate, manufactured by Maruo Calcium Co., Ltd.)
・ Talc: Super SSS (manufactured by Nippon Talc)

溶媒 The solvent-free base composition containing the above composition was blended in the amount (parts by mass) shown in Table 1. Then, the mixture was mixed at 40 ° C. or lower and stirred using a disper to prepare a solvent-free base composition.

(Solvent-free curing agent composition)
The composition contained in the solventless curing agent composition is as follows.
Solvent-free curing agent:
-Coronate HXLV (aliphatic isocyanate compound; manufactured by Tosoh Corporation, trimer of hexamethylene diisocyanate, NCO content: 23.2% by mass)
VESTANAT H12-MDI (aliphatic isocyanate compound; methylene bis (4,1-cyclohexylene) diisocyanate, manufactured by Evonik, NCO content: 31.9% by mass)
-Millionate MR-200 (aromatic isocyanate compound; manufactured by Tosoh Corporation, polymeric MDI, NCO content: 31% by mass)

(Example 1)
(Coating of paint composition and formation of coating film)
The solvent-free base material composition and the solvent-free curing agent composition are mixed immediately before preparing a test plate so that the ratio of active hydrogen (OH + NH ₂ ): NCO = 1: 1.16 in functional group equivalent, and a coating composition Was prepared. Next, using a doctor blade, an object to be coated (electrogalvanized steel sheet: plating amount: 3 g / m ² ) was applied so that the film thickness after curing was 200 μm. The coating composition was dried and cured at 23 ° C. for 72 hours to obtain a test plate having a coating film.

(Examples 2 to 22 and Comparative Examples 1 to 6)
A coating composition was prepared in the same manner as in Example 1 except that the type and / or amount of each component was changed to those shown in Table 1, Table 2, Table 3, or Table 4 below, and a test plate was prepared. Produced.
In addition, in each table, "charcoal" means calcium carbonate.

Using the coating compositions and test plates prepared in the above Examples and Comparative Examples, evaluations described later were performed. The evaluation results are shown in Tables 1, 2, 3 and 4 below.
The main compositions of the coating compositions used in Comparative Examples 4 to 6 are as follows.
-Load line 7000 white: Nippon Liner Co., Ltd., a solvent type acrylic resin-based road marking paint, containing toluene and ethyl acetate as a solvent. It was applied to a thickness of 200 μm according to the method of JIS K 5600-8-4.
-Roadline Mercury White: Acrylic emulsion aqueous road marking paint manufactured by Nippon Liner. It was applied to a thickness of 200 μm according to the method of JIS K 5600-8-4.
-Everline White: a melt-type road marking paint composition manufactured by Nippon Liner Co., Ltd. The method was applied according to JIS K 5600-8-4.

(Measurement of average particle diameter (D50) of pigment dispersed particles)
The average particle size of the pigment-dispersed particles was measured using a laser diffraction particle size distribution analyzer SALD-2200 (manufactured by Shimadzu Corporation) by adjusting the coating composition with toluene so as to have an appropriate measurement concentration (23 ° C.). ).
Further, the distance between the surfaces of the pigment-dispersed particles (L) was calculated from the measured average particle diameter (D50), that is, the average particle diameter (D) of the pigment-dispersed particles, and the blending amount and the specific gravity.
In the case where the coating composition contains a plurality of pigment types, the average particle diameter (D) is obtained by measuring the average particle diameter (D50) of the pigment mixture, and using the value as the average particle diameter (D) of the pigment-dispersed particles. . The specific gravity in the case where the coating composition contains a plurality of pigment types was a value converted from the specific gravity and the compounding ratio of the pigment.

(Coating film durability (wear resistance))
The coating film durability was evaluated according to the method specified in JIS K 5600-5-9 Wear resistance (wear wheel method). Using a rotary ablation tester (manufactured by Toyo Seiki Seisaku-Sho, Ltd.) as a testing machine and CS-17 (manufactured by TABER) as a wear wheel, the wear loss when rotating 1,000 times at a load of 1 kg and 60 rpm was measured. The evaluation was based on criteria.
Abrasion loss (mg) = mass of test plate before test-mass of test plate after test ：: 30 mg or less ：: More than 30 mg, 40 mg or less △: More than 40 mg, 50 mg or less △: More than 50 mg, 120 mg or less ×: Over 120mg

(Martens hardness (indentation hardness))
Using a Fischer scope HM2000XYp (manufactured by Fischer Instruments; test load: 300 mN / 20 seconds), the Martens hardness of the coating film was measured and evaluated according to the following criteria.
◎: 70N / mm ² or more ○: 60N / mm ² more than 70N / mm less than ^² ○ △: 50N / mm ² more than 60N / mm less than ^² △: 40N / mm ² more than 50N / mm ² less than ×: 40N / mm ² Less than

(Two-component mixing)
The solvent-free base composition and the solvent-free curing agent composition were stirred at a rotation speed of 500 rpm for 15 seconds using a disper at the compounding amounts shown in Table 1, and immediately, using a doctor blade, a dry film thickness of 200 μm was obtained. It was coated on the object to be coated (electrogalvanized steel sheet). The state of the coating film left at 23 ° C. for one day was evaluated according to the following criteria.
：: no stickiness of the coating film due to touch ×: stickiness of the coating film remains (the solvent-free base material composition and the solvent-free curing agent composition cannot be uniformly mixed)

(Black and white concealment (visibility))
JIS K 5600-4-1 Visual characteristics of coating film Visibility was evaluated according to Method B (hiding ratio test paper) specified in hiding power (for light-colored paint).
Using a 6 mil applicator, the coating composition was applied to black and white opacity test paper (manufactured by Nippon Test Panel Co.) at room temperature. Hue was measured using a color difference meter CR-400 (manufactured by Konica Minolta) and evaluated according to the following criteria.
○: Occlusion rate of 98% or more ×: Occlusion rate of less than 98%

According to Example 1, the coating composition has a predetermined composition according to the present disclosure, and the ratio (L) between the surface distance (L) of the pigment-dispersed particles in the coating film and the average particle diameter (D) of the pigment-dispersed particles. (L / D) within the range of the present disclosure, a coating film excellent in abrasion resistance (coating film durability), two-component mixing properties, and black-and-white opacity (visibility) could be formed.
According to Examples 2, 7 to 9, 12 to 18, and 21 to 27, it has a predetermined composition and (L / D) according to the present disclosure, and contains carbonate and titanium oxide as pigment components, thereby improving the resistance. A coating film excellent in abrasion (coating film durability) was obtained.
According to Examples 3 to 5, 10 and 20, having a predetermined composition and (L / D) according to the present disclosure, and including carbonate, talc, and titanium oxide as pigment components, the abrasion resistance was improved. (Coating film durability) A coating film excellent in two-liquid mixing property and black-and-white concealing property (visibility) was formed.
According to Example 6, having a predetermined composition and (L / D) according to the present disclosure and including talc and titanium oxide as pigment components, abrasion resistance (coating film durability), two-package A coating film having excellent mixing properties and black-and-white opacity (visibility) was formed.
According to Examples 11 and 19, the pigment has a predetermined composition and (L / D) according to the present disclosure, and contains carbonate, talc, and titanium oxide as pigment components. ), An excellent coating film could be obtained.

Thus, according to Examples 1 to 27, a coating film excellent in abrasion resistance (coating film durability), two-component mixing property, and black-and-white opacity (visibility) could be formed. For this reason, with the coating composition according to the present disclosure, for example, based on information on a road marking film such as a white line, when controlling automatic driving of a vehicle, it is possible to further improve the accuracy of automatic driving. it can. Further, with the coating composition according to the present disclosure, a coating film having a long service life can be formed, and the time required for forming the coating film can be shortened.

On the other hand, in Comparative Examples 1 and 2, since (L / D) was out of the range of the present disclosure, the two-component mixing property was poor, and after the coating of the coating composition, the base composition and the curing agent composition were uniform. Mixing was not possible, and stickiness of the coating film remained.
In Comparative Example 3, since (L / D) was out of the range of the present disclosure, the black-and-white opacity was poor and the visibility of the coating film was poor.
Comparative Examples 4 to 6 are all commercially available coating compositions and do not have at least the predetermined composition according to the present disclosure. In these coating compositions, the abrasion loss is remarkably high as compared with the coating films obtained in Examples according to the present disclosure, and sufficient durability cannot be obtained.

であれば With the coating composition of the present invention, a coating film having excellent abrasion resistance can be formed. Further, the present invention can provide a coating composition having excellent two-liquid mixing properties. The coating composition of the present invention can sufficiently mix the solvent-free base composition and the solvent-free curing agent composition contained in the coating composition, so that the coating and curing of the coating composition can be performed in a shorter time. .

Reference Signs List 1 coating film 2 pigment particles D average particle diameter of pigment dispersed particles L distance between surfaces of pigment dispersed particles

Claims

Solvent-free base composition,
A solvent-free curing agent composition and a coating composition,
The solventless base composition includes a film-forming resin, a pigment and an organometallic catalyst,
The film-forming resin includes at least one selected from a polyol and an aromatic polyfunctional amine,
The pigment includes at least one selected from the group consisting of carbonate, titanium oxide, zinc oxide, precipitated barium sulfate, talc, silica, and kaolin,
The solventless curing agent composition comprises at least one selected from the group consisting of an aliphatic polyfunctional isocyanate compound and an aromatic polyfunctional isocyanate compound,
The ratio (L / D) of the distance (L) between the surfaces of the pigment-dispersed particles and the average particle diameter (D) of the pigment-dispersed particles in the coating film containing the coating composition is 0.4 to 2.0. There is a coating composition.
The ratio [NCO / (OH + NH 2 )] of the equivalent of the NCO group contained in the solvent-free curing agent composition to the sum of the equivalent of the OH group and the equivalent of the NH 2 group contained in the solvent-free base composition is
The coating composition according to claim 1, wherein the coating composition is 0.5 or more and 2.0 or less.
The coating composition according to claim 1 or 2, wherein the amount of the pigment is 5 parts by mass or more and 55 parts by mass or less based on 100 parts by mass of the solid content of the coating composition.
4. The coating composition according to claim 1, wherein the pigment dispersed particles of the pigment have an average particle diameter (D) of 0.2 μm or more and 50 μm or less. 5.
The coating composition according to any one of claims 1 to 4, wherein the carbonate is calcium carbonate.
The coating composition according to claim 5, wherein the amount of the calcium carbonate is 5 parts by mass or more and 55 parts by mass or less based on 100 parts by mass of the solid content of the coating composition.
The coating composition according to any one of claims 1 to 6, which is a coating composition for road marking and / or a coating composition for road heat shielding.
The coating composition according to any one of claims 1 to 6, wherein the coating composition is at least one selected from the group consisting of a coating composition for coating an inner surface of an iron pipe, a coating composition for coating an outer surface of an iron pipe, and a coating composition for coating the inner and outer surfaces of an iron pipe. object.
The coating composition according to any one of claims 1 to 7, wherein the coating composition having a thickness of 200 µm has a wear amount of 120 mg or less in a wear resistance test according to JIS K 5600-5-9.
Applying the coating composition according to any one of claims 1 to 9 to an object to be coated,
Curing the coating composition after the coating,
Including
The coating is performed by at least one method selected from the group consisting of spray coating, slit coater coating, and flow coating,
Coating method.