Wood painting metho

Abstract

To simplify maintenance and administration.SOLUTION: A method includes a painting step of painting an impregnation type paint on a surface of wood to form an impregnation type paint layer, and a coating step of painting a coating agent on a surface of the impregnation type paint layer to form a coating layer of a thin film. Maintenance and administration is performed by carrying out only the coating step after a predetermined period.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method for coating wood. [Background technology]

[0002] When placed outdoors, the surface of wood will discolor and deteriorate in a relatively short period of time due to the effects of sunlight, dryness, moisture, decay bacteria, mold, etc. Therefore, in order to maintain the original appearance of wood, for example, the surface of wood is painted.

[0003] Furthermore, Patent Document 1 discloses that the surface of wood is impregnated with an impregnation liquid in a manufacturing factory to impart hardness, water resistance, and the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-170809 Summary of the Invention [Problem to be solved by the invention]

[0005] Paint applied to wood deteriorates over time, and so repainting (for example, painting work requiring temporary scaffolding) is necessary, which requires a lot of maintenance work. In addition, the technology in Patent Document 1 does not allow repainting on-site, so after a period of time, all the components must be replaced.

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to simplify maintenance and management. [Means for solving the problem]

[0007] The main invention for achieving the above object is a wood painting method comprising a painting step of applying an impregnation type paint to the surface of wood to form an impregnation type paint layer, and a coating step of applying a coating agent to the surface of the impregnation type paint layer to form a thin coating layer, the method being maintained and managed by performing only the coating step after a predetermined period of time has elapsed.

[0008] Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings. Effect of the Invention

[0009] According to the present invention, maintenance can be simplified. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an illustration of a paint used to protect a wood surface. [Diagram 2] FIG. 2 is a diagram showing a cross-sectional image of the coating specification of a comparative example (impregnation type). [Diagram 3] FIG. 13 is a diagram showing a cross-sectional image of a coating specification of another comparative example (film-forming type). [Figure 4] FIG. 2 is a diagram showing a cross-sectional image of the paint specification of the present embodiment. [Diagram 5] FIG. 2 is a flow diagram of the coating method of the present embodiment. [Figure 6] FIG. 13 is a diagram showing the state of the first application. [Figure 7] FIG. 13 is a diagram showing the state of the second application. [Figure 8] FIG. 13 is a diagram showing how a coating is applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] At least the following points will become apparent from the description of this specification and the accompanying drawings.

[0012] (Aspect 1) This wood painting method comprises a painting step of applying an impregnation type paint to the surface of wood to form an impregnation type paint layer, and a coating step of applying a coating agent to the surface of the impregnation type paint layer to form a thin coating layer, and is characterized in that the method is maintained by performing only the coating step after a predetermined period of time has elapsed.

[0013] According to the wood coating method of the first aspect, maintenance can be simplified.

[0014] (Aspect 2) In the wood coating method according to the first aspect, it is preferable that the coating step includes applying the coating material multiple times.

[0015] According to the wood coating method of the second aspect, the thickness of the impregnation type paint layer can be increased.

[0016] (Aspect 3) In the wood coating method according to aspect 2, it is preferable that the second or subsequent coatings of the paint are applied after the previously applied paint has dried.

[0017] According to the wood coating method of the third aspect, the paint can be neatly applied in layers.

[0018] (Aspect 4) In the wood coating method according to any one of the first to third aspects, it is preferable that in the coating step, the coating material is spread while being rotated using a coating means.

[0019] According to the wood coating method of the fourth aspect, the paint can be applied uniformly and without unevenness.

[0020] (Aspect 5) In the wood coating method according to any one of the first to fourth aspects, it is preferable that in the coating step, the coating agent is spread while being rotated using a coating means.

[0021] According to the wood coating method of the fifth aspect, the coating agent can be applied uniformly and without unevenness.

[0022] (Aspect 6) In the wood coating method according to any one of the first to fifth aspects, it is preferable that the paint contains a pigment and the coating agent does not contain the pigment.

[0023] According to the wood coating method of the sixth aspect, the wood surface can be colored and protected with a transparent coating layer.

[0024] (Aspect 7) In the wood coating method according to any one of the first to sixth aspects, the paint and the coating agent are preferably water-based.

[0025] According to the wood coating method of the seventh aspect, there is little odor and it is easy to handle.

[0026] (Aspect 8) In the wood coating method according to any one of the first to seventh aspects, the coating layer preferably has a thickness of 5 μm or more and 30 μm or less.

[0027] According to the wood coating method of the eighth aspect, the beauty of the wood surface can be maintained while protecting the impregnating paint layer.

[0028] === Implementation form === <<About painting wood>> As part of measures to combat global warming, technological development is underway for large-scale wooden structures that use wood, which is a source of carbon dioxide fixation, as a structural material, and in recent years, wood is being used not only for the interiors of buildings but also for the exteriors.

[0029] In this application, "wood" is not limited to wood (solid wood) cut from logs, but includes all materials manufactured from wood raw materials (e.g., plywood, laminated lumber, single-ply lumber, etc.).

[0030] In outdoor environments, the surface of wood will discolor and deteriorate in a relatively short period of time due to, for example, sunlight, dryness, humidity, decay fungi, mold, etc. Therefore, in order to maintain the original appearance of wood, for example, the surface of wood is painted.

[0031] The standard coating specifications for wood include "wood preservative coating" as specified in the Architectural Institute of Japan's Standard Specifications for Building Construction. The quality of wood preservative paint is also specified in the Architectural Institute of Japan's Material Standard (JASS18 M-307).

[0032] FIG. 1 is an illustration of a paint used to protect wood surfaces.

[0033] As shown in Figure 1, there are two types of wood paint: "impregnation type" that does not form a coating film, and "film-forming type" that forms a coating film. Impregnation types include "one-component, oil-based" and "one-component, water-based." Film-forming types include "one-component, water-based" and "two-component (base agent, hardener) solvent-based" urethane clear systems (no standard).

[0034] The film-forming type has a longer service life than the impregnating type, but is also more expensive. Also, as described below, there is a problem that the formed film (coating) may crack. Therefore, the impregnating type, which does not form a coating, is generally used.

[0035] In addition, in the case of impregnation, water-based paints have less odor and less impact on the human body and the environment than oil-based paints. In addition, they can be used outdoors once they dry. In addition, in the case of water-based paints, tools used for applying the paint can be washed with tap water and reused for painting.

[0036] In the present embodiment described later, an easy-to-handle water-based impregnation type paint (one-liquid, water-based, impregnation type) is used as the paint.

[0037] <Painting method of comparative example> Fig. 2 is a diagram showing a cross-sectional image of the coating specification of the comparative example (impregnation type), in which the cross-sectional image is exaggerated.

[0038] The painting procedure involves applying (spraying) the same impregnation paint 20 (one-liquid, water-based) for wood protection two or three times to the surface of the wooden piece 10. This forms an impregnation paint layer 21 of the impregnation paint 20 on the surface side of the wooden piece 10. The impregnation paint 20 contains a pigment, and the formation of the impregnation paint layer 21 colors the wooden piece 10.

[0039] The service life (estimated time until repainting) of this impregnating paint (impregnating paint layer 21) is 3 to 5 years, as shown in Figure 1. When repainting after a certain period of time, the same painting work as when the building was new (installation of temporary scaffolding and application of paint twice) is required. Furthermore, there is a risk that the amount of paint required will increase due to deterioration of the wood surface or loss of part of the existing paint (impregnating paint layer 21) due to unevenness of the wood surface.

[0040] This meant that maintenance was time-consuming, and when the cost of temporary scaffolding was taken into account, the pitch (interval between repainting) was shorter than the paint finish maintenance required for normal building construction, resulting in a higher life cycle cost.

[0041] It is possible to extend the period until repainting (for example, 5 to 7 years) by increasing the number of coats to increase the amount of impregnating paint 20 applied (in other words, the thickness of the impregnating paint layer 21) or by using a highly colored (high pigment content) paint. However, there is a problem that the former increases costs, and the latter increases the degree to which the wood grain is concealed (the texture of the wood cannot be utilized).

[0042] Also, Figure 3 is a diagram showing a cross-sectional image of the coating specification of another comparative example (film-forming type). In this example, a film-forming urethane clear paint is used. Again, the cross-sectional image is exaggerated.

[0043] When using a highly weather-resistant, transparent urethane clear paint (hereinafter, film-forming paint 30), the film-forming paint 30 is applied (here, three times) to the surface of the wood 10 to form a coating film 31 of the film-forming paint 30 on the surface of the wood 10. When coloring, it is sufficient to apply (e.g., once) an impregnation-type paint (e.g., impregnation-type paint 20) in advance before applying the film-forming paint 30.

[0044] In the case of this urethane clear film-forming paint 30, since it is a two-liquid, solvent-based paint, there is a problem of odor when it is applied on-site.

[0045] In addition, when repainting due to aging, the same highly weather-resistant transparent urethane clear (two-component, solvent-based) film-forming paint 30 is used for on-site application. This requires full-scale painting work, including the installation of temporary scaffolding (which requires protection to prevent paint from scattering), and there were issues with the time-consuming maintenance and high costs.

[0046] 3, when drying cracks 10a occur on the wooden piece 10, the coating film 31 formed by the film-forming paint 30 may not be able to follow the drying cracks 10a, and the coating film 31 directly above the drying cracks 10a may also crack (causing coating cracks 31a). In this case, there is a risk that the coating film 31 may easily peel off from the area of ​​the coating cracks 31a (causing the wooden piece 10 to easily deteriorate).

[0047] Furthermore, the drying cracks 10a in the wood 10 first require repairs such as applying putty 12 to fill the gaps, and when redoing coloring, the previously formed coating film 31 must be removed, which is time-consuming.

[0048] <Painting method according to this embodiment> In this embodiment, a coating of impregnation-type paint (impregnation-type paint 20) is used as a base, and a transparent coating agent (coating agent 50 described below) is applied on top of it to form a thin protective layer. After some time has passed, maintenance is performed by applying only the coating agent. This coating agent can be applied in the same manner as waxing an automobile body, etc., which simplifies maintenance. Hereinafter, applying the coating agent will also be referred to as "coating application."

[0049] Fig. 4 is a diagram showing a cross-sectional image of the coating specification of this embodiment. The cross-sectional image is also exaggerated in Fig. 4. Fig. 5 is a flow chart of the coating method of this embodiment.

[0050] First, the impregnation type paint 20 (one-liquid, water-based, impregnation type) is applied for the first time to the surface of the wood material 10 (S01), and the applied impregnation type paint 20 is spread evenly.

[0051] After the impregnation type paint 20 applied in step S01 (by soaking into the wooden piece 10) has dried, a second application of the impregnation type paint 20 is performed (S02), and the applied impregnation type paint 20 is spread evenly. This forms an impregnation type paint layer 21 on the wooden piece 10 similar to that shown in Fig. 2. Note that by applying the second application after the impregnation type paint 20 applied in step S01 has dried, the paint can be neatly layered.

[0052] After the impregnation type paint 20 applied in step S02 has dried, a transparent coating agent 50 is applied thereon (specifically, on the surface of the impregnation type paint layer 21) (S03) and spread evenly. As a result, a thin coating layer 51 is formed on the top (surface) of the impregnation type paint layer 21.

[0053] Here, the thin coating layer 51 is a layer (protective layer) for protecting the impregnation type paint layer 21, and its thickness is desirably 5 to 30 μm (5 μm or more and 30 μm or less). This makes it possible to protect the impregnation type paint layer 21 while maintaining the beauty of the surface of the wood material 10 (the impregnation type paint layer 21).

[0054] The coating agent 50 may be water-based (aqueous), and may be, for example, a material containing carbamate wax, a polysiloxane compound, a silane coupling agent, or the like. In this embodiment, the coating agent 50 is transparent, but is not limited to this. For example, the coating agent 50 may be translucent. However, if the coating agent 50 is translucent, there is a risk that the degree of concealment of the grain of the wooden piece 10 may be increased, so it is more desirable that the coating agent 50 be transparent (i.e., that it does not contain a pigment).

[0055] Regarding maintenance, as shown in Fig. 4, only the application of the coating agent 50 (step S03 in Fig. 5) is performed after a relatively short period (a predetermined period) has elapsed. By repeatedly applying the coating agent 50 (forming the coating layer 51), the beauty of the building can be maintained as it was when it was newly built.

[0056] Furthermore, application of the coating agent 50 does not require specialized equipment in a factory or the like, but can be carried out on-site. For example, it can be as simple as waxing an interior floor or cleaning windows. This means that full-scale painting work that requires temporary scaffolding is not required (it is not time-consuming), and maintenance can be simplified.

[0057] <Example of coating using a test piece> Using a wood specimen, the painting method shown in the flow chart in Fig. 5 was carried out. Fig. 6 shows the first application, Fig. 7 shows the second application, and Fig. 8 shows the coating process.

[0058] (First application of impregnating paint 20) As shown in Fig. 6, the impregnating paint 20 was applied to the surface of the test specimen (wood) using a brush, and then spread evenly and thinly using a sponge. Specifically, the paint was spread evenly and imprinted onto the test specimen while rotating the sponge (moving the sponge around the axis of rotation) in a manner similar to waxing.

[0059] (Second coat of impregnating paint 20) After the impregnating paint 20 applied in the first application dried, as shown in FIG. 7, the impregnating paint 20 was applied with a brush in the same manner as in the first application, and the sponge was rotated in the same manner as in the first application to spread the paint evenly and thinly.

[0060] (Coating) After the second applied impregnating paint 20 had dried, a sponge was used to spread a thin layer of coating agent 50 as shown in Fig. 8. In this operation, the sponge soaked in coating agent 50 was rotated in a manner similar to waxing to spread the coating thinly and evenly over the surface to avoid unevenness.

[0061] In this case, since the test specimens are small, a sponge is used as a tool (application means) for spreading the impregnating paint 20 and coating agent 50, but when actually applying to wood, it is preferable to use a trowel.

[0062] A trowel is a painting tool that combines a pad that soaks up paint with a rod-shaped handle (grip). The pad is made of felt or sponge, and its flat shape is generally rectangular. The application surface of a trowel is flat and wide, making it easy to apply paint evenly and produce a nice finish. Commercially available trowels include the One-Touch INNOVA 150mm (manufactured by Handy Crown) and JR-260 (manufactured by Aica Kogyo Co., Ltd.).

[0063] When using a trowel to paint, the paint is placed in a container (such as a tray) that is larger in flat surface area than the pad, and the pad of the trowel is soaked in paint and spread over the object to be painted (in this case, the wooden surface). By using a trowel, a wide area can be painted at once, and the finish can be achieved without unevenness.

[0064] When using a trowel, it is preferable to spread the paint by rotating it in the same manner as in the case of the sponge described above. However, this is not limited to this, and the paint may be spread by moving it in a straight line, for example.

[0065] A polisher may also be used as the application means. A polisher is a tool that polishes by rotating a disk-shaped tool (buff) made of felt or sponge at high speed, and is used for many purposes other than polishing, such as removing scratches and cleaning. For example, it is used to apply wax to car bodies. This polisher can be used to apply paints and coatings.

[0066] Polishers are available in single action and dual action varieties.

[0067] A single action polisher has a disk-shaped buff that rotates in a fixed direction around the center of the disk.

[0068] A double action polisher is a polisher that performs two actions: the same rotational motion as a single action, and an eccentric motion (eccentric rotation) in which the center of the disk (rotation axis) moves. The two types of motion allow for more delicate work (in this embodiment, the work of spreading paint or coating agent evenly and thinly). An example of a double action polisher is the dust-collecting random action sander GEX125-1AE (manufactured by BOSCH). By using such a double action polisher, the efficiency of painting or coating can be further improved.

[0069] ===Other embodiments=== The above-mentioned embodiment is for the purpose of facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof.

[0070] In the above-described embodiment, the application means is exemplified by a sponge, a trowel, and a polisher, but is not limited thereto. For example, a cloth, a roller, etc. may be used. In the case of a roller, the roller is rotated around its central axis while the outer periphery of the roller is in contact with the object to be coated (such as a wooden surface) to be coated.

[0071] In addition, in the above embodiment, the impregnation type paint 20 is applied twice, but it may be applied once, or three or more times. [Explanation of symbols]

[0072] 10 wood 10a Dry cracks 12. Pâté 20 Impregnating paint 21 Impregnating paint layer 30 Film-forming paint 31 Paint film 31a Paint cracking 50 Coating Agent 51 Coating layer

Claims

1. A coating process for applying an impregnating paint to the surface of the wood to form an impregnating paint layer; a coating step of applying a coating agent to the surface of the impregnation type paint layer to form a thin coating layer; having After a predetermined period of time has elapsed, the coating process is carried out alone to maintain the coating. A method for coating wood.

2. The wood coating method according to claim 1, In the painting step, the paint is applied multiple times. A method for coating wood.

3. The wood coating method according to claim 2, The second or subsequent coatings of the paint are applied after the previous coating has dried. A method for coating wood.

4. The wood coating method according to claim 1, In the coating step, the coating material is spread by rotating the coating means. A method for coating wood.

5. The wood coating method according to claim 1, In the coating step, the coating agent is spread by rotating an application means. A method for coating wood.

6. The wood coating method according to any one of claims 1 to 5, The paint contains a pigment, The coating agent does not contain the pigment. A method for coating wood.

7. The wood coating method according to any one of claims 1 to 5, The paint and the coating agent are water-based. A method for coating wood.

8. The wood coating method according to any one of claims 1 to 5, The thickness of the coating layer is 5 μm or more and 30 μm or less. A method for coating wood.

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