JP2013022530A - Method of coating decorative board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of coating a decorative board which can easily create a textured design such as a gradation and sputter.SOLUTION: A coating film 2 is formed on the surface of a base material 1 to coat the decorative board. Beads 3 of which bead average diameter is 60 μm or less and is 1.5 times the thickness of the coating film 2 before drying or less and a paint having 500 cps or less of viscosity measured by a BM type viscometer in conditions of a rotor No. 3 and 60 rpm are mixed. The paint with which the beads 3 are mixed is applied to the surface of the base material 1 having irregularities at 55°C or lower of temperature, to form the coating film 2. The beads 3 remain in recesses 1a, so as to create a design such as a gradation and sputter.

Description

  The present invention relates to a method for painting a decorative board used for a building board or the like.

  Conventionally, in a decorative board used for a building board or the like, design expressions such as blurring and sputtering are used in order to improve the appearance design. Blur is to make the boundary between the outline and the color unclear. Sputtering is to give a color with a fine speckled pattern. A natural color tone can be given to the coating film by the design expression of blurring and sputtering. For example, in ceramic-type exterior materials, it is possible to express the appearance of an outer wall formed of natural stone.

JP 2001-232727 A

  In order to give the design expression of blurring and sputtering as described above, it is expressed by a paint pattern of paint or ink. However, if a design of blur or spatter was expressed by the pattern of painting, only a flat design with no depth could be expressed.

  Patent Document 1 discloses that a coating layer containing inorganic fine particles is provided on the surface of a substrate, but this method is not intended to express a design such as blurring or sputtering.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for painting a decorative board that can easily express a design having a depth such as blurring or sputtering.

  In the method for coating a decorative board according to the present invention, when a decorative film is applied by forming a coating film on the surface of a substrate, the average bead diameter is 60 μm or less and 1.5 times or less the thickness of the coating film before drying. And the rotor No. with a BM viscometer. 3. A paint having a viscosity of 500 cps or less measured under a condition of 60 rpm is mixed, and the paint in which the beads are mixed is applied to the surface of the substrate provided with irregularities at a temperature of 55 ° C. or less. A film is formed.

  According to the present invention, beads can be accumulated in the concave portion of the base material, and the color boundary can be obscured or a speckled pattern can be formed by the beads. Can be easily applied to the decorative board.

It is a schematic sectional drawing explaining an example of the coating method of the decorative board by this invention. It is a photograph which shows an example of a coating state.

  FIG. 1 shows an example of a decorative board coated according to the present invention. A coating film 2 is formed on the surface of the substrate 1 by a paint. The coating film 2 includes beads 3. In this embodiment, an undercoat layer 4 is formed in the lower layer of the coating film 2.

  As a paint for forming the coating film 2 on the surface of the substrate 1, a paint having a viscosity of 500 cps or less as measured with a BM viscometer is used. The viscosity of 500 cps is 500 mPa · s. Beads 3 are mixed with this paint.

  As the beads 3 to be mixed with the paint, those having an average bead diameter of 60 μm or less are used. The average bead diameter is 1.5 times or less the thickness of the coating film 2 before drying. By using the beads 3 having such an average bead diameter, a design such as blurring or sputtering can be expressed on the coating film. In addition, by using the beads 3, it is possible to express a texture that has a three-dimensional effect and depth, and that has a touch feeling. From the viewpoint of design expression, the average bead diameter is preferably 5 μm or more. Further, the average bead diameter is preferably at least 0.1 times the thickness of the coating film 2 before drying. The diameter of the beads constituting the beads 3 is preferably a minimum value of 1 μm and a maximum value of 200 μm. In addition, the thickness before drying of the coating film 2 is a thickness to which a coating material for forming the coating film 2 is applied. This thickness may be the thickness before drying of the coating film 2 in the portion where the beads 3 are disposed. In addition, when the substrate 1 is provided with the concave portion 1a and the convex portion 1b, the thickness in the concave portion 1a. It may be the thickness of the coating film 2 before drying. The average bead diameter is an average particle diameter of the beads 3 and can be measured by, for example, a laser diffraction particle size distribution meter.

  As a material for the beads 3, resin beads can be preferably used. In particular, it is preferable to use colored beads. If colored beads are used, blurring and spatter can be expressed by the color of the colored beads. The color of the color beads may be the same color as that of the paint or may be a different color. Examples of the resin material constituting the beads 3 include, but are not limited to, an acrylic resin, an acrylonitrile resin, a fluorine-based resin, polyethylene, and polypropylene. The shape of the beads may be spherical, or may be an egg shape or an ellipsoid.

  The coating material is not particularly limited as long as it is a liquid-based coating material capable of forming a coating film and can disperse the beads 3. For example, a clear coating material can be preferably used. In particular, it is preferable to use an acrylic clear paint. In that case, a hard surface coating film can be formed with an acrylic resin. Further, when the coating film 2 becomes a clear coating film, the coating film 2 can be seen through and the beads 3 can be visually recognized from the outside, and it becomes easy to apply design expressions such as blurring and sputtering. The paint may include a colorant. In that case, the substrate 1 can be painted in various colors. For example, if the paint is a gray color and the beads 3 are a dark gray or black color, a stone-like expression is possible.

  The paint for forming the coating film 2 may contain a curing agent, a curing accelerator, a stabilizer, etc. in addition to the resin and the colorant. Further, it is preferable to use water, alcohol, esters, ketones and the like as the solvent of the paint. When these solvents are used, it is easy to make the beads 3 flow. In addition, when a solvent is volatile, it is removed at the time of drying.

  The amount of the beads 3 added to the paint is preferably in the range of 0.1 to 30 parts by mass with respect to 100 parts by mass of the paint, but is not limited thereto.

  The viscosity of the paint was measured using a BM viscometer with a rotor No. The viscosity is 500 cps or less, that is, a value indicating 500 mPa · s or less. By setting the viscosity of the paint within this range, the beads 3 can be accumulated in the concave portion 1a on the substrate surface. The viscosity of the paint is preferably 50 cps or more. This viscosity is a value measured under the same conditions as described above with a BM viscometer. If the viscosity is too low, the design of blurring or sputtering may not be expressed. Further, the beads may settle and the dispersion may become non-uniform.

  The substrate 1 is preferably a ceramic building material, particularly a ceramic building board that is plate-shaped. By applying a design of blurring or sputtering to ceramic building materials such as exterior materials, the appearance of the building can be finished to a natural feeling, and a highly designed building can be obtained. As the ceramic material, a cement-based molding material can be preferably used.

  As shown in FIG. 1, the substrate 1 having a surface with unevenness can be used. In this embodiment, the concave portion 1 a and the convex portion 1 b are formed on the surface of the base material 1. The bottom part of the recessed part 1a and the front part (upper end) of the convex part 1b are each formed as a flat surface. Thereby, a plate-shaped decorative material suitable for a building material can be obtained. The depth of the irregularities formed by the concave portions 1a and the convex portions 1b is preferably about 1 to 2000 μm. Moreover, it is preferable that the inclined surface 1c is formed between the recessed part 1a and the convex part 1b. The angle of the inclined surface 1c is preferably 30 to 75 degrees with respect to the substrate surface. By forming an inclination by the inclined surface 1c, the beads 3 can be efficiently accumulated in the recess 1a. Moreover, in the base-material surface, when the position of the up-down direction of the upper end of the some convex part 1b is constant, the several recessed part 1a from which depth differs may be provided. Variations in the design can be expanded by collecting more beads 3 in the deep recesses 1a.

  On the surface of the substrate 1, an undercoat layer 4 is preferably provided in the lower layer of the coating film 2. The fixability of the coating film 2 can be enhanced by the undercoat layer 4. As the undercoat layer 4, a layer formed of an enamel paint can be preferably used. The undercoat layer 4 preferably has an uneven surface substantially following the unevenness of the substrate 1. In the form of FIG. 1, the undercoat layer 4 is formed with a concave portion 4 a and a convex portion 4 b of the undercoat layer 4 following the concave portion 1 a and the convex portion 1 b of the substrate 1. Further, an inclined surface 4 c of the undercoat layer 4 that is substantially the same inclination as the inclined surface 1 c of the substrate 1 is provided. The undercoat layer 4 is preferably one that does not dissolve by the paint for forming the coating film 2. The thickness of the undercoat layer 4 is preferably 10 to 100 μm.

  In applying the coating material for forming the coating film 2 on the base material 1, first, the base material 1 having the undercoat layer 4 provided on the surface of the base material 1 is prepared. At this time, another layer may be provided between the undercoat layer 4 and the surface of the substrate 1. Preferably, the base material 1 is coated with the paint for the undercoat layer 4 and dried, and then continuously sent to the next step. Then, the above-mentioned paint mixed with the beads 3 is applied to the surface of the undercoat layer 4.

  The mixing of the beads 3 can be performed by adding the beads 3 to the paint and stirring them. At this time, the beads 3 are preferably dispersed in the paint. When using a paint in which beads 3 are mixed in advance, the mixture may be stirred again immediately before application. This is because the beads 3 may settle over time. Further, it is preferable to apply the paint to the surface of the substrate 1 immediately after the beads 3 are stirred in the paint.

  The coating material for forming the coating film 2 is applied at a temperature of 55 ° C. or lower. The temperature at the time of application is governed by the ambient temperature, the temperature of the paint, and the plate temperature (substrate temperature). At this time, it is preferable that the ambient temperature and the temperature of the paint are kept at room temperature (about 25 ° C.). On the other hand, the base material 1 is after the coating / drying step of the undercoat layer 4 and usually has a temperature higher than room temperature. Therefore, the substrate temperature substantially controls the temperature at the time of application. Therefore, by setting the temperature of the substrate 1 to 55 ° C. or less, application at 55 ° C. or less becomes possible. In order to set the temperature of the base material 1 to 55 ° C. or less, it is sufficient to leave time until the temperature decreases after the undercoat layer 4 is dried. Alternatively, the temperature may be lowered by blowing air onto the substrate 1. The lower limit of the coating temperature may be room temperature (about 25 ° C.), or may be that temperature when the ambient temperature is low (for example, 4 ° C. in winter).

  As a coating method, methods such as a flow coater, a curtain coater, a roll coater, a spray gun, and an ink jet can be used.

  Moreover, in the setting at the time of application | coating, it is preferable to apply | coat to the base material 1 surface with a uniform application amount. As a result, the coating thickness can be made constant, and the thickness of the coating film 2 before drying can be made almost constant on the surface of the substrate 1. However, the applied paint may flow due to the unevenness of the substrate 1 as will be described below.

  After the coating film 2 is formed, in the wet coating film 2 that has not yet been dried, the applied paint flows, a thin coating film 2 is formed in the convex portion 1b, and a thick coating film is formed in the concave portion 1a. 2 is formed. At this time, the beads 3 flow and accumulate in the recesses 1a in accordance with the flow of the paint. Thereafter, the coating film is dried by a dryer. At this time, in the concave portion 1a, the coating film 2 is formed by drying while containing the accumulated beads 3. The coating film 2 in the recess 1a includes beads 3 whose bead average diameter is 1.5 times or less of the thickness of the coating film in this portion. Further, in the convex portion 1b, the coating film 2 is formed by drying in a state where the beads 3 are reduced or in a state where the beads 3 are not included. Thereby, the design of blurring or sputtering can be expressed by the beads 3 gathered in the recess 1a. Further, if the beads 3 are made to exist more on the inclined surface 1c as they approach the concave portion 1a from the convex portion 1b, the color of the beads 3 gradually becomes darker from the convex portion 1b to the inclined surface 1c and the concave portion 1a. It becomes possible to produce an expression.

  In addition, the thickness of the coating film 2 may be the same in the recessed part 1a and the convex part 1b. If the beads 3 can be flowed while leaving the components of the paint on the protrusions 1b, the thickness of the coating film 2 on the entire surface of the substrate 1 can be made substantially the same. Therefore, you may select the thing which is easy to flow as bead 3. In the coating film 2, a part of the beads 3 may protrude from the coating film 2.

  The thickness of the coating film 2 is preferably 2 to 100 μm. When the thickness of the coating film 2 falls within this range, it becomes easy to express the design of blurring or sputtering.

  The drying temperature in the dryer can be 60 to 300 ° C. Moreover, it is preferable that the time after entering the dryer after painting is 20 seconds or more. Thereby, the beads 3 can be stored in the recess 1a. Further, from the viewpoint of workability, it is preferable that the time from coating to entering the dryer is 60 seconds or less. When the time to enter the dryer is shortened, it is possible to leave more beads 3 in the convex portion 1b. The coating and drying can be performed continuously while feeding the substrate 1 with a belt conveyor or the like.

  In this way, the coating is applied and the base material 1 becomes a decorative board. In this embodiment, the coating film 2 is the outermost layer, and the pattern is applied to the substrate 1 by the coating film 2. According to the above-described coating method, the beads 3 can be accumulated in the recess 1a, and the color boundary can be obscured or a spotted pattern can be formed by the beads. Design expression can be easily applied to a decorative board.

  After the enamel-based undercoat layer 4 is provided on the surface of the ceramic board having the irregularities as shown in FIG. 1, the beads 3 and the clear paint are mixed under the conditions shown in Table 1, and this paint As a coating film 2, a clear coating film was formed. The clear paint was applied by spraying.

The materials used are as follows.
・ Clear paint: acrylic clear (IM7000 clear, manufactured by Kansai Paint)
Resin beads: Acrylic resin beads, Tufic AR650 (average particle size and amount added are shown in Table 1)
The viscosity of the paint was measured using a BM viscometer with rotor No. It was measured under conditions of 3, 60 rpm and room temperature (25 ° C.). Moreover, the thickness (application thickness) of the coating film 2 before drying in the base material 1 was substantially the same on the whole base material surface.

The design properties of the coating film were evaluated according to the following criteria.
・ By appearance observation, the case where the beads appear not to be uniform but collect in the recess is indicated as “◯”, the case where the bead is not uniform but is not clearly stored in the recess is indicated as “△”, and the case where the bead is uniform is indicated as “×”. did.

  As shown in Table 1, the coating film obtained by each comparative example had uniform beads and poor design. On the other hand, in the coating film obtained in each example, beads were accumulated in the recesses, and a blur or spatter pattern was formed to improve the design.

  FIG. 2 shows a photograph of the surface of the decorative board that has been painted. As shown in FIG. 2, it was confirmed that the spatter pattern was formed by collecting the beads 3 on the coating film 2.

DESCRIPTION OF SYMBOLS 1 Base material 1a Concave part 1b Convex part 1c Inclined surface 2 Coating film 3 Bead 4 Undercoat layer

Claims (1)

  When coating the decorative plate by forming a coating film on the surface of the substrate, beads having an average bead diameter of 60 μm or less and 1.5 times or less of the thickness before drying of the coating film, and a BM viscometer Rotor No. 3. A paint having a viscosity of 500 cps or less measured under a condition of 60 rpm is mixed, and the paint in which the beads are mixed is applied to the surface of the substrate provided with irregularities at a temperature of 55 ° C. or less. A method for painting a decorative board, comprising forming a film.