JP2683582B2 - Metallic paint composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a metallic coating composition capable of obtaining a coating appearance with a novel metallic luster, and more specifically, various coating methods and thick coating. The present invention relates to a metallic coating composition that gives a uniform and even metallic coating appearance.

[Conventional technology and its problems]

Conventionally, the surface of various products such as concrete structures, plastic molded products, wood products, and metal products is coated with what is commonly called a "metallic paint" that is made by mixing flaky metal powder, and these products are coated with metal. It is generally done to give a feeling.

As the metal powder used in the metallic paint, aluminum flakes, stainless steel, copper, zinc,
Nickel and the like can be mentioned, but aluminum powder is mainly used for reasons such as low cost, easy coloring to a desired color tone because it is a relatively white type, and abundant types, etc. The metallic feeling of the paint is applied in the process in which the paint is applied and dried to form a film (in the process of organic solvent-based paint, the organic solvent is evaporated, and in water-based paint, water is evaporated from the film). Convection occurs inside, and the metal powder mixed in the paint is randomly arranged by this convection, and the randomly arranged metal powder reflects the light incident from each direction to give a desired metallic feeling. Designed to be obtained.

The metallic feeling imparted by the metallic paint is also called "metallic finish" and has been practiced for a long time, but it also has various problems as described below.

(1) In order to obtain a uniform and uniform metallic finish, it is necessary to arrange the metal powder in the coating film as randomly as possible, and in particular, the convection in the coating film layer that occurs during the drying process is uniform. It is important to Therefore, for that purpose, it is necessary to apply a coating film with a cup-type air spray gun with a small amount of paint discharge so that the coating film thickness is relatively thin and uniform, and other coating methods, for example, With mortar resin guns used in architectural coating, airless spray guns, and other coating methods that use a spray gun with a large discharge rate for thick coating, or coating methods such as brush coating and roller coating,
The coating thickness is thick and tends to be non-uniform, the convection in the coating layer is non-uniform, and the metal powder is partially arranged in the same direction, causing unevenness in light reflection and a coating with a uniform metallic feel. I can't get the appearance.

(2) In order to eliminate the metallic unevenness, an attempt may be made to adjust the viscosity of the paint by adding a thixotropic agent to the metallic paint for the purpose of preventing movement of the metal powder. The effect is not enough to suppress metallic unevenness caused by uneven coating film thickness difference. Rather, addition of a large amount of the thixotropic agent tends to deteriorate the physical properties of the coating film, and is particularly unsuitable for use as an external finishing material for construction.

(3) The above-mentioned conventional metallic paint has a particle size of 10 to 30 μm.
In general, a metal powder having a relatively small m is used, and the metallic feeling of the metallic coating film obtained by the coating is only a metal-like or metal-like color, It is not suitable for the purpose of obtaining a metallic appearance.

[Problems to be solved by the invention]

The present invention is intended to solve the problems of the above conventional metallic paints, and in particular, a metallic paint composition capable of obtaining a novel coating film appearance having an excellent metallic feeling with glittering shine. The purpose is to provide.

[Means for solving the problem]

That is, the metallic coating composition provided by the present invention has a particle size of 3 with respect to 100 parts by weight of the resin solid content.
0 to 200 μm of scaly iron oxide and scaly metal powder 500 to 1
500 parts by weight, and the scaly metal powder is 1 in the total amount of the scaly iron oxide and the scaly metal powder.
It is characterized by having a coating viscosity of 20 to 300 voices at 20 ° C. in an amount of up to 70% by weight, whereby the above object can be achieved.

The metallic coating composition of the present invention having the above structure,
The reason why it is possible to form a coating film having a uniform and even metallic feeling even with a non-uniform coating film thickness is not always clear, but it is presumed that the reason is as follows. That is,
By specifying the particle size and blending amount of the flaky iron oxide and the flaky metal powder mixed in the paint, and by specifying the paint viscosity at the time of application, the convection generated in the applied coating film can be prevented. As a result, the iron oxide powder and the metal powder show a relatively slow movement, and this is considered to suppress the occurrence of the array irregularity in the metal powder even when the convection due to the difference in drying causes a difference.

The resin used in the present invention is not particularly limited, and any organic solvent-based or water-based coating resin generally used in the coating industry can be used. Specifically, synthetic resins such as nitrocellulose, ethyl cellulose, alkyd resins, acrylic resins, vinyl chloride resins, vinyl acetate resins, polyamide resins, vinyl versatate resins, styrene resins, acrylonitrile resins, or natural or synthetic rubbers. It is preferable to use these coating resins as a resin solution in a state of being dissolved in an organic solvent, or as a resin emulsion or a resin aqueous solution.

The flaky iron oxide used in the present invention is supplied to the market, and, for example, "Kikuchi Dye Co., Ltd.""Metaflake", Japan Inorganic Chemical Industry Co., Ltd. "MIO", etc. can be used. The size of the iron oxide particles is 30 to 200 μm, preferably 50 to 120 μm. When the particle size is less than 30 μm, the obtained coating film merely exhibits a metal-like or metal-like color, and lacks a glittering and metallic feeling, and improvement in design cannot be expected. On the other hand, when the thickness exceeds 200 μm, the coating workability is deteriorated, and at the same time, the metallic feeling is likely to be uneven.

Since the scaly iron oxide is generally a brown to black system, it can be used as it is as a metallic coating composition of a black system without a brown system excellent in metallic feel, but is desired for the purpose of further improving the designability. It is not suitable for coloring tones. Therefore, in the present invention, scaly metal powder is used in combination with scaly iron oxide. The amount of the flaky metal powder used is 1 to 70% by weight, preferably 10 to 50% by weight, based on the total amount of the flaky iron oxide and the flaky metal powder.
As the flaky metal powder that can be used, aluminum, stainless steel, zinc having the same particle size range as the flaky iron oxide,
Although it is a white metal powder such as nickel, it is preferable to use stainless powder or nickel powder having excellent water resistance, chemical resistance, and weather resistance.

When the amount of the flaky metal powder used is less than 1% by weight, it is difficult to color it in a desired color tone, and when it exceeds 70% by weight, the metallic feeling becomes uneven and the coating price rises. There is a disadvantage.

In the metallic coating composition of the present invention, the flaky iron oxide and flaky metal powder (hereinafter, referred to as "metallic pigment") per 100 parts by weight of the coating resin (solid content)
The mixing amount is 500 to 1500 parts by weight, and when the mixing amount exceeds 1500 parts by weight, the particle kinematics of the resulting metallic coating composition is extremely decreased and the coating workability is deteriorated, and the resin component is If it is too small, the metallic pigment will fall off from the surface of the coating film.

The metallic coating composition of the present invention uses a combination of the flaky iron oxide and the flaky metallic powder as a metallic pigment, and thus exhibits a white to gray color suitable for coloring in a desired color tone. If necessary, an optional colorant may be added to obtain a coating film having a metallic appearance with a color tone that is more excellent in design. The colorant that can be used is an inorganic or organic pigment or dye known in the paint industry, and specifically, an azo pigment, a phthalocyanine pigment, carbon black, a transparent valve pattern, and the like, and is commercially available. Although various pigment pastes and the like are used, if a large amount of opaque coloring agent is used as the coloring agent, the metallic feeling may be lost, so that it is preferable to use a transparent coloring agent.

In addition, in the present invention, various coating additives other than the above-mentioned components, for example, a dispersant, a defoaming agent, a leveling agent, a thickener, a film-forming aid, a preservative, a fungicide, and an anti-settling agent. Agents, fibrous materials and the like can be used in conventional doses.

The coating composition of the present invention, using a known disperser such as a high-speed dissolver, planetary mixer, gate mixer, etc., mixing and dispersing a predetermined amount of scaly iron oxide and scaly metal powder in the above resin. Can be obtained by In the dispersion of the resin and the metallic pigment, a disperser to which a strong dispersive force is applied, for example, a disperser that rotates a disk in glass beads or the like, a disperser such as a ball mill or a roll mill, has a flaky shape. The iron oxide is further finely pulverized, and the desired metallic feel may not be obtained, which is not preferable.

In order to obtain a uniform and even metallic coating film with the metallic coating composition of the present invention, it is important that the coating viscosity at the time of coating is 20 to 300 poise at 20 ° C, preferably 30 to 100 poise. When the viscosity of the paint is out of the above range, it is preferable to adjust the viscosity with an appropriate diluent. When the paint viscosity is lower than 20 poise, the metallic pigment easily flows in the applied coating film to cause metallic unevenness, and when the paint viscosity is higher than 300 poise, the smoothness of the coating film surface is lost. Incidentally, the metallic coating composition of the present invention, because the flake iron oxide and the metal powder in the coating are more likely to settle as the viscosity becomes lower, the coating viscosity can be reduced when only the storage is targeted. 100
It is preferable to set it higher than poise.

There is no particular limitation on the coating method of the coating composition of the present invention, most coating methods known in the coating industry, for example, spray coating using an air spray gun, airless spray gun, mortar resin gun, Juraku gun, roller coating. ,
Coating methods such as brush coating, iron coating, and spatula coating can be used. Further, it is one of the features of the present invention that it can be coated by a curtain flow coater, which has been difficult to apply metallic coating until now.

The substrate that can give a metallic feeling by the coating composition of the present invention, concrete, ceramic materials, rubber,
Examples include plastic, metal, wood, paper and cloth.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples, but these Examples are merely examples and do not limit the present invention. In addition, the compounding quantity of each component in the following examples was shown by weight.

Examples 1 to 4 and Comparative Examples 1 and 2 Production of Metallic Paint A metallic paint composition was prepared by uniformly adding each component according to the formulation shown in Table 1 below and uniformly mixing them using a high speed dissolver. .

Evaluation of metallic coating Each metallic coating composition obtained above, 3mm
It was applied to a thick asbestos slate board and dried at room temperature for one day, and the appearance of the formed coating film was evaluated. The coating method and the evaluation results are also shown in Table-1.

Supplementary explanation of the above-mentioned Table-1 Paint compounding ingredients (* 1) Acrylic resin A; Taisei Kako, Akrit 109
A, Resin content 50%, (* 5) Acrylic resin B; Dainippon Ink and Chemicals Co., Ltd., Boncoat 3985, Resin content 50%, (* 5) Anti-settling agent; Kusumoto Kasei Co., Disparlon 6900
-10X, (* 4) Membrane forming aid; manufactured by Daicel Chemical Industries, Texanol, (* 5) HEC; hydroxyethyl cellulose, (* 6) dissolved in water for use, (* 7) iron oxide A; Kikuchi Dye Industry Co., Metaflake # 6
0, scaly iron oxide powder having a particle size of about 60 μm, (* 8) iron oxide B; Kikuchi Dye Industry Co., Ltd., Metaflake # 8
0, scaly iron oxide powder with a particle size of approximately 80 μm, (* 9) nickel powder; Fukuda Metal Foil & Powder Co., Ltd., scaly nickel powder E12, particle size of approximately 35 μm, (* 10) stainless steel; Kawatetsu Techno Research Flake shaped stainless steel powder SP ace, particle size about 35 μm, (* 11) aluminum; Alpaste 54-452, flake shaped aluminum powder with particle size about 35 μm, (* 12) preservative Manufactured by San Nopco, Nopco Side N-54
D, (* 13) Defoamer A: Kusumoto Kasei Co., Disparlon OX-70, (* 14) Defoamer B: San Nopco Co., Nopco 8034 (* 15) Processed Pigment A: Yokohama Kasei Co., Unilant 66 Blue, (* 16) Processed Pigment B; Hoechst Synthetic Co., Coranyl Red FGR, coating method (* a) Paint dilution ratio; metallic paint when painting
Kind and amount of diluent used to dilute 100 parts (part), (* b) paint viscosity; paint viscosity during coating (poise / 20
(° C), (* c) coating equipment; each having a mouthpiece diameter of 4 mm, (* d) coating amount; metallic coating usage amount (kg / m ² ), (* e) coating film evaluation result (evaluation Criteria) ◎: Excellent concealment, metallic appearance with glitter, uniform and even finish, ◎ ○: Metal appearance with strong glitter, even finish, ○: Metal appearance with glitter, uneven No finish, ○ △: It has a uniform metallic feel, but it is inferior in chemical resistance, △: There is glitter, it is excellent in metallic feel, but metal powder falls off when lightly rubbed with a finger, ×: Glistening feel And a mediocre metallic appearance, as can be seen from the evaluation results in Table 1 above, Examples 1 to 4 in which a specific metallic pigment is blended in a specific ratio.
The metallic coating compositions shown in 1 above all gave a glittering metallic feeling peculiar to the present invention by adjusting the coating viscosity and coating, and formed a coating film excellent in designability.
On the other hand, the metallic coating compositions shown in Comparative Examples 1 and 2 in which the composition or blending amount of the metallic pigment is out of the range of the present invention are poor in practicality due to poor glitter or other coating film defects. It was a thing.

〔The invention's effect〕

The metallic coating composition of the present invention comprises a mixture of a specific amount of scaly iron oxide powder having a specific particle diameter and a specific amount of metallic powder as a metallic pigment for giving a metallic feeling. Even with a coating method in which it is difficult to keep the film thickness constant, it has the effect of obtaining a uniform and even metallic feeling, and the metallic pigment used in the present invention has a particle size smaller than that of the conventional one. Since it is large, a coating film with glittering brilliance can be obtained, and it has extremely excellent designability. Furthermore, in contrast to the conventional ring flake-shaped iron oxide-containing paint which has the drawback that it is difficult to color, one of the characteristics is that the paint composition of the present invention is easily colored in a desired color tone. For example, since the coating composition of the present invention is designed so that the blending ratio of the metallic pigment is high, the cohesive force of the obtained coating film is small, and therefore the shrinkage of the coating film during drying is small. Even when applied to a panel-shaped base material that is thin or has low strength, it has a secondary effect of preventing warpage of the base material, and is of extremely high practical value.

Claims (2)

(57) [Claims] 1. A scaly iron oxide powder and a scaly metal powder 500 having a particle size of 30 to 200 μm with respect to 100 parts by weight of a resin solid content.
~ 1500 parts by weight, and the scaly metal powder is 1 to 70 wt% in the total amount of the scaly iron oxide and scaly metal powder, the coating viscosity at 20 ℃ 20 ~. A metallic coating composition, which is 300 poise. 2. The metallic coating composition according to claim 1, wherein the flaky metal powder is stainless steel or nickel.