JPH11181337A - Metallic tone paint composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition which gives a coating film showing no metallic uneveness and a good weather resistance by adjusting the viscosity and the specific gravity of the composition by using an organic solvent, a vinyl-based synthetic resin, a metallic pigment and a viscosity controlling agent and dispersing thereof in a water dispersive medium as gelled particles. SOLUTION: An organic solvent (for example; a fatty hydrocarbon), a vinyl- based synthetic resin (for example; an acrylate-metacrylate copolymer), a metallic pigment (for example a; pearl mica) and a viscosity controlling agent (for example; a bentonite) are mixed to produce the composition having a viscosity adjusted at 0.2-15 Pa.s measured by a BH-type viscometer under 20 rpm and at 20 deg.C (an indicated value at the fourth rotation), a TI value adjusted at 1.2-8.0 and a specific gravity adjusted at 1.0-1.3, which is then dispersed in a water dispersive medium as a gelled particle (a TI value = η1/η2; η1 is an apparent viscosity under 2 rpm (Pa.s: an indicated value at the second rotation); η2 is an apparent viscosity under 20 rpm (Pa.s: an indicated value at the fourth rotation).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallic paint composition which can form a coating film having excellent weather resistance, in which metallic unevenness is very inconspicuous by one application.

[0002]

2. Description of the Related Art Conventionally, there has been known a paint which forms a coating film having a metallic luster, which is called a metallic paint. The metallic paint contains a metallic pigment in the paint formulation in order to impart metallic luster to the formed coating film. Metallic pigments include metal powders such as aluminum, iron, copper, and stainless steel, which are actually pulverized into fine metal powders, mixed with resins, etc., and metal oxides represented by titanium on the surface of fine mica pieces. Pearl pigments coated with an object. By blending such a metallic pigment in a binder resin, which is the main constituent of the coating film, the glitter of the metallic pigment seen through the binder resin from the coating film surface is perceived on the side to be viewed as metallic luster. is there.

On the other hand, there is a coating form comprising a dispersoid containing a binder, a coloring material, a filler, and various additives, which are a main constituent of a coating film, and a dispersion medium for dispersing the dispersoid. A typical example of such a coating composition is a multi-color paint which forms a multi-color paint film by one application. This multicolor paint is specified in JIS K 5667-1983, and has a structure in which two or more color particles in a liquid or gel state are suspended.

[0004] The idea about the composition of such a paint is as follows.
P. Beginning with the BUSCH patent, C. According to ZOLA, US Patent No. 2,591,904, Japanese Patent No. 231
No. 698, represented by an oil-in-water type colorful paint.

[0005] Subsequently, various varnished paints have been developed by paint technicians in Japan and overseas, all of which fall into the following categories.

Oil-in-water type (hereinafter referred to as O / W type) A type in which a dispersed phase, which is a colored organic solvent-based coating material, is dispersed in a water-soluble dispersion medium to a discernible size as a discontinuous phase. .

Water-in-oil type (hereinafter referred to as W / O type) A type in which a dispersion medium is oily and a colored aqueous dispersion phase is dispersed as a discontinuous phase.

Oil-in-oil type (hereinafter referred to as O / O type) An oil-based dispersion medium is used, and a colored sol-like substance that is incompatible with the dispersion medium is dispersed in an discontinuous phase using an organic solvent-based enamel. type.

Water-in-water type (hereinafter referred to as W / W type) A type in which a water-colored gel-like substance is dispersed in a discontinuous phase in an aqueous dispersion medium.

[0010] The above-mentioned various multicolor paints are prepared by mixing various coloring materials with the disperse phase to give different colors, and to impart a multicolor design to the formed coating film. In addition, in some cases, a metallic pigment for imparting a metallic design feeling is blended in addition to the coloring material to form a metallic-colored multicolored coating film.

[0011]

However, in a conventional coating composition containing a metallic pigment, the metallic feeling caused by insufficient dispersion of the metallic pigment, which is called "metallic unevenness", is not uniform, and the coating is not applied. In this case, there is a problem that the streaks occur at the time, the orientation of the metallic pigment varies due to a slight difference in the film thickness, and the metallic pigment floats. Furthermore, when metal powder is used as the metallic pigment, in particular, the metal powder may be corroded or eluted due to alkali or acid rain on the substrate to be coated, or other various environmental conditions. Resulted in deterioration of the coating film.

[0012] In addition to the above-mentioned problems, the multi-color paints have a problem that the coloring particles as the disperse phase settle and fuse in the storage state due to the blending of the metallic pigment. In addition, in the colored particles, the compounded metallic pigment is likely to be biased, and in a coating film formed from such a multi-pattern paint, the metallic feeling is biased, and the multi-pattern paint loses the versatility as a result. Had become.

[0013]

Means for Solving the Problems In order to solve the above problems, the present inventors have proposed a method of preparing a suspension type coating composition of the O / W type by adding a specific resin, metallic pigment, A viscosity modifier is mixed to produce an organic solvent-based composition, which is mixed with a specific aqueous dispersion medium together with a gelling agent and dispersed as gel-like particles, thereby causing sedimentation and fusion of the dispersed phase. Invented was a metallic paint composition having a good metallic feeling of the formed coating film, and excellent in weather resistance, antifouling property and smoothness.

That is, (A) a. An organic solvent, b. Vinyl synthetic resin, c. Metallic pigments, d. At 20 ° C., the viscosity at 20 rpm (indicated value at the fourth rotation) was 0.2 to 1 at a temperature of 20 ° C.
5 Pa · s, the TI value determined by the following is 1.2 to
The gel-like particles of the organic solvent-based composition adjusted to have a specific gravity of 8.0 and a specific gravity of 1.0 to 1.3 are dispersed in the aqueous dispersion medium (B).

<TI value> TI value: A value obtained by using a BH type viscometer according to equation 1. TI value = η1 / η2 (Equation 1) (where η1: apparent viscosity at 2 rpm (Pa · s:
2nd rotation guideline value), η2: Apparent viscosity at 20 rpm (Pa · s: 4th rotation guideline value))

Here, the compounding procedure of the components of the O / W type suspension coating composition is as follows: the organic solvent composition of (A) is gradually added while stirring the aqueous dispersion medium of (B). Then, while further stirring, the (C) gelling agent of the organic solvent composition (A) is added.

Next, in the present invention, the organic solvent-based composition (A) that forms gel-like particles comprises: a. An organic solvent, b. Vinyl synthetic resin, c. Metallic pigments, d. It is composed of a viscosity modifier.

A. As the organic solvent, n-hexane, n
-Aliphatic hydrocarbons such as heptane, mineral spirits, etc., aromatic hydrocarbons such as benzene, toluene, xylene, alicyclic hydrocarbons such as cyclohexane, chlorinated hydrocarbons such as dichloroethane, trichlene, perchrene or the like; Of mixed solvents.

B. Vinyl synthetic resins include vinyl esters such as vinyl acetate and vinyl propionate, vinyl ethers such as ethyl vinyl ether and butyl vinyl ether, acrylates and methacrylates of aliphatic alcohols, acrylonitrile, styrene, vinyl chloride, vinylidene chloride and vinyl toluene. It is a vinyl-based synthetic resin obtained by polymerizing one or more selected acrylic acid, methacrylic acid, itaconic acid and the like, which may provide an acid value. The acid value in this case is preferably from 1 to 30.

C. Metallic pigments are blended in an organic solvent-based composition in order to impart a metallic design to a coating film. Metal powders such as aluminum, nickel, copper, and stainless steel, and pastes thereof, pearl mica, glass The material is not particularly limited as long as it produces metal-like light reflection, such as beads, and it is also possible to use them in combination. In addition, as long as the effects of the present invention are not impaired, it is also possible to mix in an aqueous dispersion medium.

D. The viscosity modifier is blended to prevent each component in the organic solvent-based composition from causing aggregation and sedimentation, and examples thereof include bentonite, aluminum stearate, and amide wax.

In the present invention, in order to adjust the specific gravity of the organic solvent-based composition (A) to fall within the specified range of the present invention,
Further, e. As filler, talc, precipitated barium sulfate, heavy calcium carbonate, kaolin, clay, diatomaceous earth,
It is preferable to use white carbon, barium carbonate, wollastonite or the like in combination.

A. An organic solvent, b. Vinyl synthetic resin,
c. Metallic pigments, d. A viscosity modifier, more preferably formulated e. The ratio with the filler can be appropriately selected according to the intended design. 20 to 60% by weight of an organic solvent, b.
5 to 30% by weight of a vinyl synthetic resin, c. 1 to 25% by weight of a metallic pigment, d. 0.1 to 3% by weight of viscosity modifier,
e. A ratio of 1 to 50% by weight of filler is desirable.

Further, in the organic solvent composition, f. As a coloring material, inorganic pigments such as titanium oxide, zinc oxide, ocher, titanium yellow, red iron oxide, orca, carbon black, chrome green, ultramarine blue, phthalocyanine blue, quinacridone red, perylene red, brilliant carmine, isoindolinone yellow, and first It is also possible to adjust the color to various colors by appropriately blending an organic pigment such as yellow.

In addition, additives such as thickeners, dispersants, defoamers, drying regulators, preservatives, anti-algae agents, and fungicides, which are usually added to paints, are contained in the organic solvent-based composition. It is possible to mix them so as not to impair the effects of the invention.

The TI value of the organic solvent-based composition of the present invention is 1.
By setting the content to 2 to 8.0, the metallic pigment in the organic solvent-based composition is dispersed well, so that the unevenness of the metallic feeling at the time of coating is improved and the dispersion of the gel-like particles at the time of spray coating is reduced. Become smooth. Conversely, when the TI value is less than 1.2, the metallic pigment precipitates in the gel particles of the organic solvent-based composition during long-term storage, uneven distribution of the metallic pigment occurs at the time of coating, and a uniform pattern layer is formed. No metallic pattern appears. When it is larger than 8.0, the viscosity of the gel-like particles is biased toward the thixotropic tendency, so that the gel-like particles tend to be mist during coating.

On the other hand, the specific gravity of the organic solvent-based composition is 1.0 to
By adjusting to 1.3, it is possible to solve the problem that the gel-like particles do not sediment extremely even in the storage state, and that the gel-like particles are fused together. The scattering becomes smooth.
Conversely, if the specific gravity is smaller than 1.0, the gel-like particles float on the aqueous dispersion medium, and a part of the gel-like particles that have risen solidifies to become skinned, resulting in a defective product as a coating composition. If the ratio is larger than 1.3, the gel-like particles tend to sediment extremely, which causes the gel-like particles to fuse together.

The aqueous dispersion medium (B) is not particularly limited as long as it can stably disperse the gel particles of the organic solvent composition as a protective colloid. Considering the height and the durability of the finally formed coating film, an aqueous polyvinyl alcohol solution is preferred.
The concentration of this aqueous polyvinyl alcohol solution is such that the degree of polymerization is 3
0.1 to 1000 of polyvinyl alcohol
Those dissolved in water at a concentration of up to 5.0% by weight preferably have a suitable protective colloid function. The concentration of polyvinyl alcohol is
If it is lower than 0.1, the gel particles of the dispersed phase are less stable and tend to fuse. Conversely, if it is higher than 5, the particle size of the gel particles becomes too small, making it difficult to produce gel particles of a predetermined size.

The (A) organic solvent-based composition is dispersed in (B) an aqueous dispersion medium to form gel-like particles. At this time, the (A) organic solvent-based composition is mixed with the (B) aqueous dispersion medium. Inside (C)
Mix while stirring with the gelling agent. As the gelling agent (C) used in this case, tetra-i-propoxy titanium, tetra-n-butoxy titanium, di-i-propoxy bis (acetylacetonato) titanium, di-n-
Organotitanium compounds such as butoxybis (triethanolaminato) titanium, zirconium normal butyrate,
Organic zirconium compounds such as zirconium tetraacetylacetonate, zirconium monoacetylacetonate, and zirconium bisacetylacetonate; silane couplings such as vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, and γ-methacryloxypropyltrimethoxysilane Agents and the like can be used.

The mixing ratio of (A), (B) and (C) is not particularly limited as long as the gel-like particles are stably dispersed. However, when the above-mentioned polyvinyl alcohol is used as the aqueous dispersion medium, Is based on 100 parts by weight of (B)
It is preferable to mix (A) in an amount of 5 to 250 parts by weight.

On the other hand, when a cationic polyvinyl alcohol is used in place of the polyvinyl alcohol used in the aqueous polyvinyl alcohol solution of the component (B) of the present invention, a metallic paint composition having more excellent antifouling property and antifungal property can be obtained. Become.

Such a cationic polyvinyl alcohol is not particularly limited. For example, a method for post-modifying a polyvinyl alcohol polymer is described in JP-B-30-5563, for example, for each production method. Of amino group by aminoacetalization of
Japanese Patent Application Laid-Open No. 34842/1990 discloses a method for producing cationic polyvinyl alcohol containing a quaternary ammonium salt by reacting glycidyltrimethylammonium chloride with polyvinyl alcohol in the presence of an alkali catalyst, and a second method for copolymerization. No. 56-14504,
JP-A-56-88113, JP-A-56-11899
No. 7, in each publication, a method of saponifying a copolymer of aminoalkyl (meth) acrylamide, aminoalkyl (meth) acrylate (or a quaternary ammonium salt thereof) and vinyl acetate to obtain a cationic polyvinyl alcohol, As described in JP-A-59-135202, N- (3-allyloxy-2-hydroxypropyl) dimethylamine, N- (3-allyloxy-2-hydroxy-2-methylpropyl) dimethylamine,
(4-allyloxy-3-hydroxybutyl) obtained by partially or completely saponifying a copolymer of a cationic monomer such as dimethylamine or a quaternary ammonium salt thereof and an alkyl vinyl ester. There are things.

The concentration of the aqueous solution of the cationic polyvinyl alcohol is set at 0.
1 to 5.0% by weight, but the degree of polymerization is 1000 to 1%.
What about 500 may be melt | dissolved in 50 degreeC-80 degreeC warm water. If the concentration of the polyvinyl alcohol is lower than 0.1, the particles of the dispersed phase are difficult to stabilize and tend to fuse together. If the concentration is higher than 5.0, the particle size is too small, and the dispersed phase is stably formed at the target particle size. The difficulty in dispersing is the same as in ordinary polyvinyl alcohol.

Furthermore, if a crosslinking agent is previously added to the organic solvent composition of the component (A) of the present invention, the strength of the dispersed phase is improved, and the destruction of the dispersed phase during stirring is further reduced. Results. However, even if the strength of the dispersed phase is improved in this way, the surface gelled film of the dispersed phase does not change, and thus has no effect on the fusion of the dispersed phase at the time of forming the coating film.

The crosslinking agent is not particularly limited as long as it crosslinks the resin in the component (A).
For example, as inorganic compounds, magnesium oxide, calcium oxide, zinc oxide, metal oxides such as aluminum oxide, calcium chloride, metal halides such as magnesium chloride, organic compounds such as calcium acetate,
Organic acid metal salts such as calcium phthalate, phenol and amino resins, amine and aziridine compounds, isocyanates, and silane couplings such as vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, and γ-methacryloxypropyltrimethoxysilane Agents and the aforementioned organic titanate compounds can also be used.

Although the mixing ratio of such a cross-linking agent varies depending on the type thereof, it is approximately 1 to 1 in an organic solvent-based composition.
An amount of 5% by weight is desirable. Further, in order to crosslink the inside of the dispersed phase to some extent with this crosslinking agent, when a resin having an acid value is used as the resin forming the dispersed phase, the acid value may be set slightly lower.

The metallic coating composition of the present invention comprises a plurality of suspension-type coating compositions having different hues, each of which is obtained by dispersing an organic solvent-based composition having a different hue as a coloring material in an aqueous dispersion medium. And by appropriately mixing them, it is also possible to obtain a metallic-colored multi-color paint composition.

Further, the composition is formed from a plurality of organic solvent-based compositions in which the mixing ratio of the metallic pigment is different.
A metallic paint composition in which a plurality of suspension-type paint compositions are mixed is formed by spray-coating since the metallic feeling differs for each gel-like particle in the mixed suspension-type paint composition. The metallic feeling of the coating film, even in the case of the same hue of the same coloring material, the metallic feeling changes randomly, and a very beautiful coating film that can not be obtained with the conventional metallic coating film can be formed. .

The substrate to which the metallic coating composition of the present invention is applied is not particularly limited as long as the coating film is not peeled off.
Examples include the surface of civil engineering structures, inorganic and organic building materials, and wallpaper.

In applying the metallic coating composition of the present invention, if the surface of the object to be coated has irregularities or cracks and is so severe that it cannot be covered by the coating of the present invention, the surface is smoothed in advance with a base material. It is necessary to form a surface. In addition, a sealer or a primer may be applied as an undercoat material in order to adjust the suction condition of the base and to further improve the adhesion of the coating film of the present invention. At this time, after applying and drying the colored coating on the undercoat, using an appropriate joint bar or a perforated formwork, after masking the undercoat, the metallic coating composition of the present invention is applied, and finally It is also possible to form joint patterns by removing joint bars and formwork. In addition, acrylic, urethane,
It is also possible to apply an acrylic silicon-based or fluorine-based overcoating material.

[0041]

EXAMPLES (Accelerated Storage Stability) Suspension-type coating compositions were prepared using the respective raw materials shown in Table 1 and in the mixing ratios shown in Table 2 or Table 3. The procedure is as follows. The dispersion medium is charged into a stirring tank, and the organic solvent-based composition prepared in advance is gradually added while stirring at 500 to 1500 rpm with an impeller. The size of the gel particles was adjusted by stirring. While further stirring, the organic titanate compound was gradually added, and after addition of a predetermined amount, stirring was further continued for 20 minutes. The suspension-type coating composition thus produced was stored at 50 ° C. for 7 days, and the progress was observed. The results are shown in Table 4. As the evaluation method, those in which no abnormality was particularly observed were evaluated as ○, and those in which abnormality was found in the gel particles were evaluated as x.

(Workability) Like the accelerated storage stability, Table 1
The suspension-type paint composition prepared using the raw materials shown in Table 2 or 3 at the compounding ratio as shown in Table 2 or 3 was placed on a 90 cm square slate plate (5 mm thick) which was held in a vertical state. It was applied at a required amount of 0.4 kg / m ² with a paint spray gun (gun pressure: 294 Pa). During this coating, the ease with which each suspension-type coating composition was blown out from the spray gun, the degree of dispersion of the gel-like particles at the time of blowing, and the degree of dripping of the gel-like particles attached to the slate plate were confirmed. As the evaluation method, the gel particles are smoothly sprayed at the time of painting, without breaking until the gel particles reach the slate plate, crushed on the slate plate, those that form a clear circular pattern ○, at the time of painting When the gel-like particles were finely crushed and scattered when sprayed, when the circular pattern was unclear, and when the gel-like particles adhered to the slate plate dripped, they were evaluated as x.

(Smoothness of coating film) In a workability test, a slate plate coated with each suspension-type coating composition was cured at 20 ° C for 7 minutes.
After drying and curing for one day, the smoothness of the formed coating film was visually checked. A smooth one was evaluated as ○, and a gel-like particle having extremely conspicuous irregularities was evaluated as ×. The results are shown in Tables 7 and 8.

(Designability) Following the smoothness test of the coating films, the evaluation of the designability of each coating film was evaluated as to whether or not the metallic feeling was uneven. Was visually evaluated.

(Water Resistance) The test pieces evaluated for their design properties were visually observed and evaluated for whitening and blistering of the coating film when immersed in tap water for 3 days. No abnormality was evaluated as ○, slight swelling was evaluated as △, and all swelling was evaluated as x.

(Touch-up property) Using the raw materials shown in Table 1, the suspension type coating composition prepared in the mixing ratio as shown in Table 2 or Table 3 was used. A required amount of 0.4 kg / m on a slate plate (thickness: 5 mm) with a spray gun for multi-color paint (gun pressure: 294 Pa)
² was applied. After the coated slate plate was dried and cured at 20 ° C. for 7 days, a part of the coating film surface (about 15 cm square) was damaged with a nail. Thereafter, the suspension type paint composition used previously was applied to a required amount of 0.4 kg / m by a multi-color paint spray gun (gun pressure: 294 Pa) so as to cover the wound surface.
^After partial coating with 2, the coating was dried and cured at 20 ° C. for 7 days, and the coating film surface was visually observed and evaluated. A mark with scarcely noticeable scratches was evaluated as ○, and a mark with marked scratches and uneven metallic feeling was evaluated as x.

(Examples 1 to 4) Using the raw materials shown in Table 1, each suspension-type coating composition was produced based on the composition shown in Table 2, and the above-mentioned tests were carried out. The gel particles stably existed in the suspension-type coating composition without any particular abnormality in the accelerated storage stability.
Also, in spray coating with a spray gun, the gel-like particles spouted smoothly, crushed on the surface of the object to be coated, formed a clear circular pattern, and the coating film was also very smooth. .

(Comparative Example 1) Using the raw materials shown in Table 1, a suspension-type coating composition was produced based on the composition shown in Table 3.
When the above-mentioned tests were performed, the specific gravity of the organic solvent-based composition was smaller than the range specified in the present invention. It has been found that there is a problem that occurs.

(Comparative Example 2) A suspension-type coating composition was produced in the same manner as in Comparative Example 1, and the above-mentioned tests were performed.
Since the specific gravity of the organic solvent-based composition is larger than the range specified in the present invention, it has been found that there is a problem that the gel-like particles settle and fuse in the suspension-type coating composition during storage. . Further, when the suspension-type coating composition immediately after the production was spray-coated, there was no problem in the coating workability, but the gel-like particles were insufficiently crushed on the surface of the object to be coated. The coated film surface became uneven. In the water resistance test, since the pigment volume concentration was high and the specific gravity was large, the coating film was porous and swelled on the entire surface.

(Comparative Example 3) A suspension-type coating composition was produced in the same manner as in Comparative Example 1, and the above-mentioned tests were performed.
Since the viscosity and the TI value of the organic solvent-based composition are smaller than the ranges specified in the present invention, when the suspension-type coating composition is spray-coated, the gel-like particles crushed on the surface of the object to be coated are not coated. There was a tendency to hang on the object surface. In addition, a very uneven metallic appearance of the formed coating film was observed.

(Comparative Example 4) A suspension-type coating composition was produced in the same manner as in Comparative Example 1, and the above-mentioned tests were performed.
Since the TI value of the organic solvent-based composition is larger than the range specified in the present invention, when the suspension type coating composition is spray-coated, the gel-like particles ejected from the spray gun reach the surface of the object to be coated. In addition, the film was crushed and scattered, so that a finely patterned coating film was formed. When a multicolored coating film is formed by mixing different-colored suspension-type paint compositions for such a finely patterned coating film, each color appears to be integrated, and the multicolored pattern with a sharp angle is formed. This will cause a problem of being less clear. Regarding the design of the formed coating film, unevenness was observed in the metallic feeling.

(Comparative Example 5) A suspension-type coating composition was produced in the same manner as in Comparative Example 1, and the above-mentioned tests were performed.
Since the viscosity of the organic solvent-based composition exceeded the range specified in the present invention, the coating film formed when the suspension-type coating composition was spray-coated became very uneven. Regarding the design of the coating film, unevenness was observed in the metallic feeling. In the water resistance test, the metallic pigment was partially eluted in a portion having a small film thickness due to the uneven coating film, and as a result, swelling occurred.

(Comparative Example 6) Based on the composition shown in Table 3, an organic solvent-based metallic coating was produced instead of a suspension-type coating composition in which an organic solvent-based composition was dispersed in a dispersion medium. This metallic paint is applied to a 90 cm square slate plate (5 mm thick) held in a vertical state by a spray gun (gun pressure: 294 Pa) at a required amount of 0.4 kg / m ² ,
Dry curing was performed at 20 ° C. for 7 days. With respect to the water resistance of the test specimen prepared in this manner, there was no problem because the water resistance of the pearl pigment was relatively good, but the scratch portion was very conspicuous in the touch-up property, and the metallic feeling was also very uneven. occured.

(Comparative Example 7) Based on the composition shown in Table 3, an organic solvent-based metallic paint was produced instead of a suspension-type paint composition in which an organic solvent-based composition was dispersed in a dispersion medium. When a test was performed on this metallic paint in the same manner as in Comparative Example 7, in the water resistance test, the thickness of the formed coating film was thinner than that in the example, and thus the elution of the metallic pigment was observed. As a result, The entire surface was swollen. In addition, the scratch portion was very conspicuous in the touch-up property, and the metallic feeling was very uneven.

[0053]

The metallic coating composition of the present invention is prepared by using a specific resin in an organic solvent-based composition as a disperse phase and adjusting the compounding so as to have a specific viscosity, TI value and specific gravity. The strength of the gel-like particles formed by being dispersed in the aqueous dispersion medium and the dispersion state of the metallic pigment mixed in the gel-like particles become appropriate, and when spray-painted, it is smooth and metallic uneven. Very few coatings can be formed. In addition, when a plurality of different-colored suspension-type coating compositions are mixed and spray-coated, a multi-colored coating film consisting of a very large and clear circular pattern is formed, and a coating film having a uniform metallic feeling. This has the effect of Furthermore, there is an effect that the touch-up property and the weather resistance are superior to the conventional metallic paint.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

Claims (3)

[Claims] (A) a. An organic solvent, b. Vinyl synthetic resin, c. Metallic pigments, d. 20 rpm containing a viscosity modifier and measured with a BH type viscometer at a temperature of 20 ° C.
(Guideline value at the fourth rotation) is 0.2 to 15 Pa ·
s, the gel-like particles of the organic solvent-based composition adjusted to have a TI value of 1.2 to 8.0 and a specific gravity of 1.0 to 1.3 determined as described below are used as the aqueous dispersion medium (B). On the other hand, a metallic paint composition characterized by being dispersed. <TI value> TI value: A value obtained by using a BH type viscometer according to equation 1. TI value = η1 / η2 (Equation 1) (where η1: apparent viscosity at 2 rpm (Pa · s:
2nd rotation guideline value), η2: Apparent viscosity at 20 rpm (Pa · s: 4th rotation guideline value)) 2. The method according to claim 1, wherein (A) the organic solvent-based composition comprises: a. An organic solvent, b. Vinyl synthetic resin, c. Metallic pigments,
d. A viscosity modifier, e. The metallic coating composition according to claim 1, further comprising a filler. (A) a. 20 to 60% by weight of an organic solvent,
b. A vinyl synthetic resin having an acid value of 1 to 30 in a solid content of 5 to 30% by weight, c. 1 to 25% by weight of a metallic pigment, d. 0.1 to 3% by weight of a viscosity modifier, e. Filling material 1
At a temperature of 20 ° C. and a viscosity at 20 rpm (guideline value at the fourth rotation) of 0.2 to 15 Pa · s at a temperature of 20 ° C.
50 to 250 parts by weight of an organic solvent-based composition adjusted to have an I value of 1.2 to 8.0 and a specific gravity of 1.0 to 1.3,
(B) A metallic paint composition characterized by being dispersed as gel particles in 100 parts by weight of an aqueous solution of polyvinyl alcohol having a concentration of 0.1 to 5.0% by weight. <TI value> TI value: A value obtained by using a BH type viscometer according to equation 1. TI value = η1 / η2 (Equation 1) (where η1: apparent viscosity at 2 rpm (Pa · s:
2nd rotation guideline value), η2: Apparent viscosity at 20 rpm (Pa · s: 4th rotation guideline value))