JP2001191021A - Surface roughened coating film and forming method of surface roughened coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a surface roughened coating film having roughened surface by forming fine crater like recessed parts on the surface of the coating film and to provide a forming method of the coating film. SOLUTION: The surface roughened coating film is obtained by applying a liquid coating material on a base material, sticking or burying particles non- compatible with the liquid coating material during the coating material is not cured and, after curing the liquid coating material, removing the particles stuck or buried in the surface of the cured coating film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rough coated film formed as a rough surface by forming crater-shaped concave portions on the coated film surface and a method for forming the rough coated film.

[0002]

2. Description of the Related Art As an example of a paint for forming a rough surface coating film, a matte paint is known. This paint generally contains a so-called fine particle matting material such as resin beads, silica, alumina, and talc in a coating compounding component. Protrudes from the surface of the coating film to form a convex portion, and the convex portion makes the surface of the coating film rough. Therefore, when light hits the surface of such a rough coating film, the light is irregularly reflected on the coating film surface, and the coating film exhibits a matte state.

[0003] The above matte paints are mainly used for applications which hate gloss or require anti-glare properties.
It is widely used for the surface coating of various molded articles, parts, products and the like (hereinafter referred to as molded articles, etc.) used as housings for home electric appliances or OA equipment and interior parts of automobiles.

Further, as a coating material for forming a rough surface coating film similar to the above, a coating material comprising an elastic resin binder as a coating film forming component and elastic resin beads as matte fine particles is also known. (Hereinafter referred to as elastic matte paint or elastic matte coating film). This paint can also be formed into a rough surface by forming a convex portion on the coating film surface by the resin beads blended therein. In particular, in this type of coating, since both the coating film and the matting material are made of an elastic material, the same matting effect as described above can be obtained, and a soft touch can be obtained when touching the coating film surface. For this reason, it is positioned as one of the functional paints, and is attracting attention as a paint capable of increasing the added value of molded articles and the like.

[0005] A rough coated film formed by the above-mentioned conventional matting paint will be described with reference to the drawings. FIG. 3 is a cross-sectional view of a rough surface coating film formed by a conventional matte paint. In FIG. 3, reference numeral 1 denotes a substrate to be coated, 2 denotes a coating film, and 6 denotes fine particles of matting material. The fine particles of matting material 6 protrude from the surface of the coating film 2 to form a convex portion. The peripheral portion of the convex portion is relatively concave, and the entire coating film has an uneven rough surface state.

[0006]

The above-mentioned conventional matting paint is characterized in that a matte coating film can be formed by a relatively simple formulation which only incorporates matting material fine particles. There is a problem that the characteristics of the coating film are deteriorated by the blending of the fine particles. For example, when high anti-glare properties are required, such as in automobile interior parts, it is necessary to incorporate a large amount of matting material, but as the matting material increases, the flexibility of the coating film decreases. In addition, there is a problem that coating film characteristics such as resistance to bending and scratch resistance are deteriorated. In addition, since the coating film tends to be porous as the amount of the matting material increases, there is a problem in that stain resistance, chemical resistance, weather resistance, and the like also deteriorate.

Further, in the case of the elastic matting paint, since the flexibility of the coating film is not impaired, problems such as deterioration of the bending resistance and scratch resistance of the coating film are hardly observed, In selecting an elastic resin binder and an elastic resin bead to obtain a soft feeling and a matte feeling, and a combination thereof, flexibility in formulation is limited, or in addition to difficulty in formulation, cost is high. Problems such as poor abrasion resistance and chemical resistance.

In the present invention, therefore, it is an object of the present invention to provide a rough surface coating film having a sufficient matting effect without using a matting material which is likely to cause problems such as deterioration of coating film properties. An object of the present invention is to provide a method for forming a rough coated film.

[0009]

The rough surface coating film provided by the present invention is characterized in that it has a rough surface by forming minute crater-like recesses on the surface of the coating film. Further, in this case, the rough surface may be formed on at least a part of the coating film, and further preferably, the coating film is a coating film having elasticity, particularly, The elongation is preferably in the range of 50% to 300%.

[0010] The rough surface coating film of the present invention is obtained by coating a liquid paint on a substrate surface and, while the liquid paint is not yet cured, fine particles incompatible with the liquid paint. It is characterized by being formed by adhering or embedding on the surface and then curing the liquid coating, and then removing fine particles adhering or embedding on the surface of the cured coating. In this formation method, the liquid coating applied to the substrate surface is preferably an organic solvent type coating, and the fine particles incompatible with the liquid coating are preferably water-absorbing resin particles. ,
The removal of the water-absorbing resin particles is preferably performed after the particles have absorbed and swollen. Further, in the method of the present invention, the liquid paint used therein preferably forms an elastic coating film after curing. In particular, the liquid coating material has an elongation of 50% to 300% of the cured coating film. It is preferable that the coating material forms a coating film in the range.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rough coated film of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the rough surface coating film of the present invention. In FIG. Reference numeral 3 denotes a crater-shaped concave portion, and reference numeral 4 denotes a cross-sectional projecting convex portion. That is, the rough surface coating film of the present invention is characterized in that crater-shaped concave portions 3 are formed on the surface of the coating film 2, and with the formation of the crater-shaped concave portions, the peripheral portion of the concave portions is Since the projections are formed so as to protrude relatively, the coating film surface has a rough surface with irregularities.

The above-mentioned rough coated film of the present invention is greatly different from the rough coated film obtained from the conventional matting paints in that the conventional matte coated film is blended with the matting material. In contrast, the present invention provides a rough coating film by projecting particles to the coating film surface to form a convex portion, but in the present invention, by forming a crater-like concave portion on the coating film surface,
The point is that the coating film in the peripheral portion is relatively raised to form a convex portion, thereby obtaining a rough surface coating film. That is, since the roughened coating film of the present invention does not need to contain the matting agent fine particles at all in forming the unevenness for roughening, the coating film property deterioration caused by the blending of the matting agent is reduced. Such a problem can be prevented.

In the formation of the rough surface coating film of the present invention, the entire surface of the coating film can be roughened.
It is also possible to roughen only part of the coating. For example,
When attaching the concave portion forming particles to the liquid paint film surface,
Performing through an appropriate masking jig and applying the particles so that patterns, figures, characters, etc. can be drawn so that only that part is roughened, and a highly designed coating film consisting of a combination of a glossy part and a matte part Is obtained. Such an advantage is also one of the major features of the present invention, and it goes without saying that the partially roughened coating film is also included in the scope of the present invention.

Further, in the present invention, the rough surface coating is preferably a coating having elasticity. In particular, the elongation of the coating is defined by JIS K5400, 8.8 tensile strength and elongation. Elongation as measured by the above method is 50% ~
Preferably it is in the range of 300%. When such a coating film is roughened, in addition to the intended matting effect,
There is a great feature that a better soft feeling can be obtained when the coating film surface is touched by hand. The reason is that the soft feeling obtained from the conventional elastic matte coating film is mainly caused by the deformation of the elastic resin beads incorporated in the coating film, whereas the rough surface coating film of the present invention has The soft feeling is obtained by deformation of the convex portion having a projecting cross section formed so as to surround the periphery of the concave portion of the coating film. It is considered that the softness of the coating film is superior.

A method for forming a rough coating film according to the present invention will be described with reference to the drawings. FIG. 2 is a sectional view showing a forming procedure in a method of forming a rough surface coating film of the present invention. In FIG. 2, 1 is a substrate, 2 is a coating film. 3 is a crater-shaped recess, 4
Denotes protrusions in cross section (the above is the same as in FIG. 1), and 5 denotes particles for forming recesses. FIG. 2 (a) shows a step in which a liquid paint is applied to the surface of an arbitrary substrate 1 to form a liquid coating film 2, and FIG. 2 (b) shows a process in which the liquid coating film 2 is uncured. The step of attaching or burying the recess-forming particles 5 on the surface thereof, and the step (c) of removing the recess-forming particles 5 from the surface of the coating film after the liquid coating film is cured. By performing the above steps sequentially, the rough surface coating film of the present invention can be obtained.

In the rough surface coating film of the present invention, the coating material that can be used for forming the coating film is not particularly limited, and includes various coating materials that are common in the coating industry. In forming a crater-shaped concave portion on the coating film surface, it is preferable to use a liquid paint from the viewpoint of ease of formation. Specifically, a polyester resin, a polyurethane resin, an acrylic resin, a vinyl acetate resin, a vinyl chloride resin, a natural rubber or a synthetic rubber is used as a coating film forming component, and a pigment, a dye, an organic solvent, and other It is a paint prepared by blending various paint additives.
These paints may be one-pack paints or two-pack paints using various curing agents.

Among the above paints, it is preferable to use a paint that forms an elastic coating film after curing. In particular, the elongation percentage of the cured coating film is specified in JIS K5400, 8.8 tensile strength and elongation percentage. 50% to 3 when measured by the method
It is preferable to use a paint that forms a coating film in the range of 00%. Specific examples of such paints include polyester
There are isocyanate prepolymer two-component reaction-curable coatings, urethane coatings, etc.Rough surface coatings formed from such elastic coatings have a good matte state and a better soft feel. Therefore, it is possible to contribute to a high added value of a coated article such as a molded article.

The paint used for forming the rough surface coating film of the present invention can be applied to any substrate surface by various known coating methods such as spraying, brushing, dipping, a roller, and a curtain flow coater. . In this case, there is no particular limitation on the amount of application, but it is preferable to apply the coating so as to become a relatively thick film since it is necessary to form a crater-shaped recess on the surface of the coating film. As an example, it is preferable to apply the coating so that the thickness of the cured coating film is 10 μm or more, and it is particularly preferable that the coating thickness is 30 to 100 μm.

In the present invention, in order to form a crater-shaped recess on the surface of a coating film, the above-mentioned coating material is applied to an arbitrary substrate surface, and while the coating material is not yet cured, the surface of the coating material is incompatible with the liquid coating material. It is formed by attaching or burying the crater-like concave forming particles and then curing the liquid paint, and then removing the concave forming particles from the cured coating film surface.

The particles for forming the concave portions which can be used in the present invention need to be particles which can be easily removed from the surface of the coating film since they must be finally removed from the surface of the coating film. The particles need to be incompatible with the liquid paint. In the present invention, the particles that are incompatible with the liquid paint are preferably particles themselves that are incompatible, but even if the particles are compatible, a surface treatment is appropriately performed so as to be incompatible. Particles can be used. These particles may be further subjected to a surface treatment with a release agent, a surfactant or the like so that the particles can be easily and reliably removed from the cured coating film surface.

Specific examples of the particles incompatible with the liquid paint include various organic particles or inorganic particles. Examples of the organic particles include resin particles such as acrylic resin, styrene resin, vinyl chloride resin, vinyl acetate resin, polyethylene resin, polyester resin, polyurethane resin, and epoxy resin.Examples of the inorganic particles include iron, nickel, Metal particles such as aluminum, copper, and zinc. In addition, particles of salt, calcium carbonate, sugar, and the like can be used, and these particles can be appropriately selected and used according to the type of liquid paint used for forming a coating film.

In the above-mentioned recess-forming particles, a particularly preferred example of the present invention is an example in which, when an organic solvent type liquid paint is used as the coating film-forming paint, water-absorbing resin particles are used as the recess-forming particles. In this combination, when the particles for forming the concave portion are removed in the final step, if the particles are swollen by water absorption, there is an advantage that the adhesive force between the particles and the coating film surface is remarkably reduced, and the removing operation is facilitated.

The shape and particle size of the concave portion forming particles used in the present invention are not particularly limited. The particle shape may be spherical or irregular, but spherical particles are preferable in terms of easy removal from the cured coating film surface. The particle size is generally 10 to 2000 μm, preferably 20 to 2000 μm.
Those having a range of 1500 μm can be used. Particle shape is 10
If it is smaller than μm, the rough surface formed is too dense and it is difficult to obtain a sufficient matting effect. If it is larger than 2000 μm, the matte effect is obtained but a rough feeling is generated on the coating film surface, and Product value will be reduced.

It is difficult to uniformly define the amount of the concave portion forming particles used in the present invention because there is a great difference depending on the material (specific gravity) of the particles used. Generally, it is preferable that the entire coating surface be hidden. If the amount is too small, a sufficient matting effect cannot be obtained. Conversely, if the amount is too large (for example, the entire coating surface is more than hidden), the matting effect is significantly improved. Not so economical.

In the present invention, only by spraying the particles for forming the concave portions on the surface of the uncured coating film, the trace of adhesion of the particles is formed as a concave portion on the coating film surface. Since it is proportional to the depth of the concave portion formed on the surface of the coating film, it is preferable to take measures for dispersing the concave portion forming particles such that the particles are actively buried in the coating film surface.
For example, it is preferable to apply a method of applying pressure from above after spraying the concave portion forming particles, or a method of spraying the concave portion forming particles with a spray gun or the like.

It should be noted that the phrase "buried" in the coating film surface of the concave portion forming particles in the present invention does not mean that the particles are completely buried in the coating film, and it is necessary to remove these particles in a later step. Therefore, it is preferably used in a state where about half or less of the particle volume sinks into the coating layer.

The uncured coating film on which the recess-forming particles adhere or are buried is then cured. The curing conditions in this case are preferably in accordance with the curing conditions defined for each of the used liquid paints. For example, in the case of a paint in which a cured coating film is formed by volatilization of an organic solvent contained in the paint, heating at room temperature or an appropriate temperature, and in the case of a solventless paint, it is blended there. In the case of a heating and energy ray-curable coating material at a temperature at which the reaction of the coating film forming components starts, each coating film can be cured by irradiating an energy dose necessary for the curing.

The particles for forming the concave portions are removed from the cured coating film which has been cured as described above. There is no particular limitation on the removal method at that time, and it is preferable to appropriately set the removal method according to the type of the concave part forming particles used. For example, there are generally a method of wiping and removing the coating film surface with a brush, a brush, a cloth, or the like, a method of blowing off high pressure air or pressurized water, and a method of removing with an ultrasonic cleaning device. Further, when the particles for forming concave portions are water-soluble, a method of dissolving them in water to remove them, and for metal particles, a method of magnetically attracting and removing the particles can be adopted. The particles for forming concave portions removed here can be used again as particles for forming concave portions by recovery.

The substrate on which the rough surface coating film according to the present invention can be formed is not particularly limited.
The target is a molded product made of wood, metal, paper, cloth, ceramics, glass, stone, concrete, and the like. In addition, the rough surface coating film of the present invention may be formed directly on the surface of these molded articles or the like, or may be formed via an undercoat coating film used for various purposes, and furthermore, an appropriate sheet After forming a rough coating on the surface of a film or the like, the sheet or film may be adhered to the surface of the molded product or the like.

[0030]

EXAMPLES The rough coating film and the method for forming the rough coating film in the present invention will be specifically described based on the following examples.

Example 1 40 parts by weight of an acrylic resin, 10 parts by weight of carbon black, 4 parts by weight of a structural viscosity imparting agent (Kusumoto Kasei Co., Ltd., trade name: Disparon 6900-20X), leveling agent 1
Weight part (Kusumoto Kasei Co., Ltd., trade name: Dispalon 17)
11) A coating obtained by uniformly mixing and dispersing 45 parts by weight of methyl isobutyl ketone was applied to the surface of an ABS resin base material so that the coating thickness after drying was about 30 μm. Then, while the applied coating film is kept in a fluidized state before curing, the surface of the coating film has a particle diameter of 220 μm as recess forming particles.
Water-absorbent resin particles containing 78% of particles having a particle size of ~ 900 µm (manufactured by Nippon Shokubai Kagaku Co., Ltd., trade name: Aquaric CAK)
4) is sprayed to such an extent that the entire coating surface is hidden, and then the surface is lightly pressed so that the water-absorbent resin particles are partially buried in the coating film. Cured.

The thus-obtained coating film is immersed in water, water is absorbed by the water-absorbing resin particles adhering to the coating surface, and the sufficiently swollen water-absorbing resin particles are rubbed by hand. As removed. The removal of the water-absorbent resin particles was very easy and reliable, and the obtained coating film was in a uniform rough surface state. Then, after drying the coating film to remove water, the gloss of the obtained rough surface coating film was measured with a 60-degree specular gloss meter. Sufficient matting effect was recognized as compared with the gloss ratio of 5 to 10.

Example 2 40 parts by weight of a polyester urethane resin, 10 parts by weight of carbon black, 4 parts by weight of a structural viscosity imparting agent (trade name: DISPARON 6900-20X, manufactured by Kusumoto Kasei Co., Ltd.)
A rough surface was prepared in exactly the same manner as in Example 1 except that 1 part by weight of a leveling agent (manufactured by Kusumoto Kasei Co., Ltd., trade name: Disparon 1711) and a paint obtained by uniformly mixing and dispersing 45 parts by weight of methyl isobutyl ketone were used. A test-like coating was formed and tested similarly. Elongation rate of the obtained coating film (JIS K5400,
8.8 tensile strength and elongation) were 200%.
The gloss of the obtained rough-surfaced coating film was measured by a 60-degree specular gloss meter, and the gloss ratio was 1 or less, and the touch feeling of the coating film surface was a soft brushed touch.

Example 3 A rough surface coating film was formed in exactly the same manner as in Example 2 except that the water-absorbing resin particles having an average particle diameter of 80 μm were used as the recess-forming particles in Example 2 above. did. The gloss of the obtained rough surface coating film was measured with a 60-degree specular gloss meter, and the gloss ratio was 1 or less, and the touch feeling of the coating film surface was a soft brushed touch.

[0035]

Since the present invention has been described above, it has the following effects. That is, the roughened coating film of the present invention does not need to contain a matting material such as a conventional matting paint for forming the crater-shaped concave portion for roughening, so that the matting material is mixed. It is possible to prevent problems such as deterioration of coating film properties.

In the present invention, it is also easy to roughen the coating film on only a part of the coating film. Such a partially roughened coating film can be obtained by combining a glossy part and a matte part. The resulting coating film is rich in design. Furthermore, in the present invention, the formation of the crater-shaped concave portion for roughening is performed by a coating film having elasticity, so that the coating film has excellent coating characteristics and a very soft feel, and this coating film is formed. Contributes to the high added value of molded products.

The formation of the rough surface coating film according to the present invention does not require any special compounding technique or the like, and is a simple method of simply attaching or burying the recess-forming particles to the uncured coating film surface. Can be formed. In particular, in the method of the present invention, when an organic solvent-based paint is used as the coating film-forming paint and water-absorbing resin particles are used as the recess-forming particles, the water-absorbing resin particles swell due to water absorption and have an adhesive force with the coating film surface. Is significantly reduced, so that the particles for forming the concave portions in the final step can be extremely easily and reliably removed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rough surface coating film of the present invention.

FIG. 2 is a cross-sectional view showing a process for making the coating film surface rough in the rough coating film of the present invention.

FIG. 3 is a cross-sectional view of a rough coating film formed by a conventional matting paint.

[Explanation of symbols]

 1, base material 2, coating film 3, concave portion 4, projecting convex portion 5, concave forming particles 6, matting material fine particles

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D075 AC19 AE06 BB20Z BB26Y BB63Z CA03 CA15 CB03 CB32 DA23 DC13 DC19 EA02 EA07 EB10 EB12 EB19 EB22 EB35 EB38 EB60 4J038 BA012 CA011 CA021 CB022 CC03 DD002 002 DG002 HA066 HA096 HA286 KA06 KA08 MA02 MA07 MA09 NA01 PC02 PC03 PC04 PC06 PC08 PC10

Claims (9)

[Claims] 1. A rough surface coating film having a rough surface by forming minute crater-like recesses on the surface of the coating film. 2. The rough surface coating film according to claim 1, wherein the crater-shaped concave portion is formed on a part of the coating film surface. 3. The rough surface coating film according to claim 1, wherein said coating film surface is formed of a coating film having elasticity. 4. The roughened coating film according to claim 3, wherein the elastic coating film has an elongation of 50% to 300% after curing. 5. A liquid paint is applied to a substrate surface, and while the liquid paint is uncured, particles incompatible with the liquid paint are adhered or buried on the surface of the liquid paint film. A method for forming a rough surface coating film, wherein the coating film surface is roughened by removing particles adhered or buried on the surface of the cured coating film after curing the coating film. 6. The rough coating film according to claim 5, wherein said liquid coating material is an organic solvent type liquid coating material, and said fine particles adhering to or embedded in said liquid coating film surface are water-absorbing resin particles. Forming method. 7. The rough surface coating film according to claim 6, wherein the removal of the water-absorbing resin particles adhered to or embedded in the surface of the coating film is performed after the water-absorbing resin particles are swollen by water absorption. Formation method. 8. The method according to claim 5, wherein the liquid paint is a paint that forms an elastic coating film after curing. 9. The method according to claim 1, wherein the liquid paint has an elongation of 5% after curing.
The method for forming a rough surface coating film according to any one of claims 5, 6, and 8, wherein the coating material forms a coating film in a range of 0% to 300%.