JPH0822982B2 - Paint composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coating composition, and more particularly to a top coating composition for furniture, household electric appliances, automobiles and the like that require aesthetics.

BACKGROUND ART Conventionally, top coatings for automobiles and the like are typically represented by solid colors using pigments such as titanium oxide and iron oxide and surface finishing using metallic colors using metal powder such as aluminum powder. An example of the latter is, for example,
No. 49-38005 introduces 2 coat 1 bake finish including acrylic resin type metallic base coat.

However, recently, in fields such as automobiles and home electric appliances, differentiation such as appearance and hue has been more strongly demanded than ever before.For example, in Japanese Patent Laid-Open No. 61-37423, there is a specific hue. A mica color finish has been proposed in which a coating mica layer and the like are laminated on an undercoating color having the above-mentioned color to exhibit a glittering feeling not present in a metallic coating film.

However, there are limits to the color and appearance of coatings that can be expressed with conventional paints.For example, coatings with a silky appearance and dark-colored glitter coatings are simply combinations of conventionally known pigments. You can't get it alone. For example, when a coating film is created by combining interference black mica with carbon black to obtain a silky appearance, a yellowish color remains as the coating color, and the desired silky tone cannot be obtained. However, such a thing has not been practically presented.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention It is an object of the present invention to provide a coating composition capable of giving a silk-like coating film excellent in designability and a mica color coating film having a glittering feeling which have not been conventionally obtained. is there.

Means for Solving the Problems The object of the present invention is to provide a thermosetting resin composition comprising a thermosetting film-forming resin, a cross-linking agent, and a solvent (A) an interference mica, a metal flake pigment or a combination thereof. And (B) titanium black pigment dispersedly contained therein, the pigment solid content weight ratio of (A) + (B) is 2 to 40%, and (B) is (A) +
This is achieved by the coating composition being present in a proportion of 0.5 to 35% by weight of (B).

The interference mica used in the present invention is a mica particle whose surface is coated with titanium oxide, iron oxide, chromic acid or the like alone or in combination of two or more, and any mica particles usually used for pearl coating and the like can be used. Can be one.
As a specific example, for example, Exterior Marlin Bright White (Mearl Corporation product, titanium oxide coat), Exterior Marlin Highlight Blue (Company product, titanium oxide coat), Exterior Marlin Lassett (product of the same, iron oxide coat, Titanium oxide coat) / Pearl Grace SME-90-9 (product of Nihon Koken Co., Ltd., titanium oxide coat) / Pearl Grace SMB
-90-9 (Nihon Koken Co., Ltd. product, titanium oxide coat)
Pearl Grace SMC-502-90-9 (product of Nippon Koken Co., Ltd., iron oxide, titanium oxide coat) and the like can be mentioned.

Aluminum foil is a typical example of the metal flaky pigment, and for example, Alpaste 7130 manufactured by Toyo Aluminum Mfg. Co., Ltd.
N, Alpaste 51-231, Alpaste 52-509 and the like are exemplified as usable ones.

The titanium black pigment used in combination with the interference mica and / or the metal flaky pigment is a so-called low-order titanium oxide, which is a black pigment composed of titanium oxide except titanium dioxide, A variety of colors are offered and can be selected and used as desired.

If it is shown by the composition formula, for example, TiO, Ti ₂ O ₃ , Ti ₃ O ₅ , Ti
₄ O ₇ , Ti ₂₀ O _{39 and the} like, which are represented by the general formula; Ti _X O _2X-1
(Where x is an integer satisfying 1 ≦ x ≦ 20) (or a mixture of those represented by this general formula).
Specifically, black titanium oxide M-1 and black titanium oxide S
-1 (all are products of Ishihara Sangyo Co., Ltd.) Titanium black powder 13R, titanium black 10S (all are products of Mitsubishi Metals Co., Ltd.) and the like.

If desired, color pigments, extender pigments, rust-preventive pigments, chipping-resistant pigments, etc. other than the above may be used in appropriate amounts in the pigment mixing system within a range that does not hinder the achievement of the object of the present invention. Is.

Such a pigment mixture system is dispersed and contained in a thermosetting resin composition comprising a thermosetting film forming resin, a crosslinking agent and a solvent.

As the thermosetting film-forming resin, a polyester resin composed of a polyhydric alcohol and a polybasic acid, an alkyd resin obtained by modifying this with an oil or the like, or an acrylic resin composed of (meth) acrylic acid or a (meth) acrylic acid ester For example, those which are usually used as a thermosetting binder resin in the field of paints are conveniently used, and a melamine resin, a blocked isocyanate or the like is combined with this as a crosslinking agent.

Next, the pigment solid content weight ratio of the total amount (A) + (B) of (A) interference mica, metal flaky pigment or combination thereof, and (B) titanium black pigment is the solid content of the coating composition. It is necessary to be 2 to 40% with respect to the total weight. If it is less than 2% by weight, it is difficult to obtain the desired appearance and hue. It is not preferable because it causes glossiness and it is difficult to maintain sufficient coating performance. Further, the titanium black pigment (B) should be 0.5 to 35% of the total amount of the interference mica, the metal flaky pigment (A) and the titanium black pigment (B), and when it is less than 0.5%, the silky feeling disappears.
Also, if it exceeds 35%, it will be close to black solid color,
It has been confirmed that all of them are unfavorable because the feeling of brilliance is lost, and the designability is lost.

The scaly pigment such as interference mica or aluminum foil can be dispersed uniformly as a paste which has been previously dispersed in a suitable solvent, or by directly mixing the paste directly into the coating liquid while stirring or the like. On the other hand, the titanium black pigment is, for example, previously uniformly dispersed in a part of the thermosetting acrylic resin varnish to be used, and then the remaining acrylic resin and melamine resin are added and dissolved to prepare a dispersion liquid.

Therefore, when preparing a coating composition, a dispersion liquid of titanium black pigment is first prepared, and the scale-like pigment is directly mixed with it as it is or in the form of a solvent paste.

The coating composition of the present invention is applied as a finishing topcoat to various types of objects to be coated with a thermosetting coating material, and exhibits a unique aesthetic effect. It is useful as a top coat for products and automobiles.
Among them, as a typical coating system, targeting automobiles, etc. 2
A coat 1 bake coating system may be mentioned, and the present coating composition is particularly useful as a base coat for the 2 coat 1 bake coating system.

Here, the two-coat one-bake coating system is one of the coating systems for topcoat paints, and in the case of a metal coated object such as an automobile, first, a chemical conversion treatment is usually performed to prepare an electrodeposition primer (dry film thickness). , Usually 15 to 30μ) is applied, then an intermediate coating is applied (dry film thickness, usually 35 to 40μ) and dried baking,
If desired, this two-coat, one-bake coating system is applied after a preliminary step such as smoothing the surface with water.

In other words, this is a pigment-rich base
Apply a coat and then apply a clear clear or low pigment color clear topcoat wet-on-wet and bake and cure at once to give a basecoat coating phase (dry film, usually 10 ~ 20μ) and clear or color clear layer (dry film thickness, usually 25-40
μ) and are formed.

When the coating composition according to the present invention is applied to the surface to be coated, it is possible to obtain a coating film of calm silky tone, which has not been obtained by the conventional coating compositions, and which has excellent design properties, and is particularly useful for automobiles, household electric appliances, and It will be possible to differentiate from conventional products when painting furniture and other items, which will lead to a significant increase in product value.

 A detailed description will be given below based on Examples.

 Parts and percentages are by weight unless otherwise stated.

Example 1 To 20 parts of interference mica (manufactured by Marl, Exterior Marine Bright White), 20 parts of toluene was added and uniformly dispersed.

Separately from this, titanium black pigment (Mitsubishi Metal Corp.)
Titanium black powder 13R) 20 parts thermosetting acrylic resin varnish (Mitsui Toatsu Co., Ltd., ALMATEX NT)
-U-448, resin solid content 48%) Same volume as 166.7 parts 2mmφ
Melamine resin varnish (manufactured by Dainippon Ink and Chemicals, Super Beckamine J-820-60, resin solid content 60%) was added to the liquid mixed with glass beads and dispersed for 60 minutes with a disper, and stirred for 30 minutes with a disper. And filtered to remove glass beads. The interference mica paste prepared above was added to this titanium black pigment dispersion varnish, and the mixture was uniformly stirred to obtain a coating liquid.

Examples 2 to 8 In the same manner as in Example 1, except that the same raw materials as in Example 1 were used, except that the blending amounts of the raw materials in Example 1 were changed to the blending amounts shown in Table 1. The coating liquid was adjusted.

Example 9 A coating liquid was prepared by the same formulation and method as in Example 2, except that the interference mica of Example 2 was replaced with an aluminum foil pigment (Alto Paste 7130N, manufactured by Toyo Aluminum Co., Ltd., solid content: 65%).

Comparative Example 1 To 20 parts of interference mica (Exterior Merlin Bright White, manufactured by Marl Ltd.) was added 20 parts of toluene, and the mixture was stirred and uniformly dispersed.

Separately, 166.7 parts of a thermosetting acrylic resin varnish (Almatex NT-u-448) and 33.3 parts of a melamine resin varnish (Super Beckamine J-826-60) were added and stirred with a disper for 30 minutes. The interference mica paste previously prepared was added to this varnish, and the mixture was uniformly stirred to obtain a coating liquid.

Comparative Example 2 Twenty parts of titanium black pigment (titanium black powder 13R) was mixed with a thermosetting acrylic resin varnish (ALMATEX NT-
u-448) 166.7 parts and melamine resin varnish (Super Beckamine J-826-60) 33.3 parts, add the same volume (about 200 ml) of 2 mmφ glass beads, stir with a disper for 60 minutes, and filter. The glass beads were removed and the coating liquid was adjusted.

Preparation of paint test plate Polished steel plate (length 500 mm, width 300 mm, thickness 0.8 mm) is treated with zinc phosphate (Nippon Paint Co., Ltd., Granodine SD500)
After pretreatment with a standard method of 0), a cationic power supply paint (manufactured by Nippon Paint Co., Ltd., Power Top U-30, epoxy urethane / cationic resin type) is electrodeposited by a standard method to obtain a dry film thickness of 20 μm. An electrodeposition coating film was formed. Next, an intermediate paint (Nippon Paint Co., Ltd., Olga P-2 Gray,
Polyester / melamine resin type) is applied by a conventional method,
An intermediate coating film having a dry film thickness of 35 μ was formed.

On top of this, each paint solution shown in Table 1 was diluted with a paint thinner (Nippe 298, manufactured by Nippon Paint Co., Ltd.) (#
Electrostatic spray coating with a spray gun (Ransburg Japan Ltd., RBA, Nozzle Cap No. 6) with a Ford cup (13 seconds / 20 ° C) for 1 minute between the first and second flash-off. Coating was repeated twice to form a coating film (converted to a dry film thickness, 15 μ). After that, a clear coating (Nippon Paint Co., Ltd., Superlac O-28L, acrylic melamine resin type) was applied wet-on-wet and baked at 140 ° C for 20 minutes to give a dry total film thickness of 110μ. Coating test plates, each having a film formed thereon, corresponding to each Example and Comparative Example were prepared.

 A test was conducted on this coating test plate.

Test Results Compared with Comparative Example 3, Examples 1 to 10 gave a silky, calm hue.

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Claims (1)

[Claims] 1. A thermosetting resin composition comprising a thermosetting film-forming resin, a cross-linking agent, and a solvent, and (A) an interference mica, a metal flake pigment or a combination thereof, and (B) a titanium black pigment. And (A) + (B) have a pigment solid content weight ratio of 2 to 40%, and (B) is (A) +.
A coating composition characterized by being present in an amount of 0.5 to 35% by weight of (B).