JP2009248037A - Coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating method which enables coating with the even film thickness of a coating liquid. <P>SOLUTION: The coating method, wherein after the coating liquid is applied to a surface to be coated, the coating liquid applied to the surface to be coated is coat-spread with a coating liquid impregnated cellulose sponge, and a coating liquid coating-thickness on the surface to be coated can be equalized, thereby enabling the system to form an evenly thick coating film is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coating method for uniformly applying a coating liquid.

  A coating film having a weather resistance and an antifouling effect is formed by coating a coating liquid containing a weather resistance component or an antifouling component on a wall surface or glass surface of a building. A coating solution containing such a weather resistance component or antifouling component is generally prepared as an aqueous solution or an alcohol solution, and coating is performed by spraying the coating solution using a spray gun (for example, patents). Reference 1).

  However, wind is often blown strongly at outdoor high places such as the walls of buildings, so when spraying coating liquid using a spray gun, the spray particles of the coating liquid are blown away by the wind, and the coating liquid There was a problem that a large loss occurred. In addition, when using a spray gun, an electric device such as a compressor is required, which may cause a disaster due to the falling of such a device from the height of a building.

Therefore, using a paint roller, the coating liquid is also coated by rolling the roller onto the surface to be coated such as the wall of the building or the glass surface while the roller is immersed in the coating liquid. (For example, refer to Patent Document 2).
JP 2008-73588 A JP 2004-136156 A

  However, as described above, the coating liquid formed of an aqueous solution or an alcohol solution has a lower viscosity than that of general paints. Therefore, when applied using a paint roller, liquid dripping occurs or the coating starts. There is a problem that it is difficult to coat with a uniform film thickness, such that the film thickness is thick at the part and the film thickness is thin at the end of the coating. In particular, it is necessary to apply the paint roller so that there is some overlap in the rolling trajectory so that there is no unpainted area. It cannot be avoided that it becomes thick. The coating film with weather resistance and antifouling effect formed by coating the coating liquid is a transparent film, but if the film thickness is not uniform in this way, interference fringes may occur due to the interference action of light, Color unevenness due to shading may occur, causing a problem that the appearance of a building or the like is significantly impaired.

  This invention is made | formed in view of said point, and it aims at providing the coating method which can coat a coating liquid with a uniform film thickness.

  The coating method according to claim 1 of the present invention is characterized in that after the coating liquid is applied to the surface to be coated, the coating liquid applied to the surface to be coated is spread with a cellulose sponge soaked with the coating liquid. It is what.

  When the coating liquid is applied to the surface to be coated using a paint roller or other applicator, the coating thickness of the coating liquid is not uniform, but using a cellulose sponge soaked with the coating liquid, By spreading the applied coating liquid, the coating thickness of the coating liquid on the surface to be coated can be made uniform.

  The invention of claim 2 is characterized in that in claim 1, a squeegee having a cellulose sponge sheet widely attached to the tip is attached to the tip, and the coating liquid is spread at the tip of the cellulose sponge sheet of the squeegee. It is.

  Cellulose sponge is attached in the form of a strip-like sheet in the coating tool, and it can easily perform the work of uniformly spreading the coating liquid applied to the surface to be coated by the action of a squeegee blade. is there.

  According to the present invention, the coating thickness of the coating liquid on the surface to be coated is made uniform by spreading the coating liquid coated on the surface to be coated using a cellulose sponge soaked with the coating liquid. And a coating film having a uniform thickness can be formed.

  Hereinafter, the best mode for carrying out the present invention will be described.

  The cellulose sponge is composed of cellulose derived from pulp and natural fibers such as flax and cotton blended as reinforcing fibers. Cellulose sponges are generally produced as follows. First, natural pulp is immersed in a caustic soda solution and pulverized. After the pulp is aged, carbon disulfide is added and sulfided. Next, the viscose is prepared by mixing the reinforcing fibers so that the mass ratio of the pulp and the reinforcing fibers such as cotton is about 65:35, and adding and dissolving the caustic soda solution. After mixing crystalline viscose with this viscose, pressure molding is carried out, and this is boiled and heated, and it is made to coagulate, and a cellulose reproduction body is prepared. The cellulose sponge can be obtained by washing with water and washing the mirabilite to form a sponge, followed by post-treatment such as washing and acid treatment.

  Cellulose sponges have fine open cells as traces of dissolution of mirabilite, and cellulose has a hydrophilic group and is therefore easily compatible with water. For this reason, it has self-water-absorption and self-water-holding by the capillary phenomenon due to fine bubbles, and the absorbed moisture can be held without flowing down.

  Such cellulose sponges are conventionally known in Japanese Patent Publication No. 42-15788, Japanese Patent Application Laid-Open No. 5-305967, Japanese Patent Application Laid-Open No. 11-49881, Japanese Patent Application Laid-Open No. 2007-77320, and the like. What is marketed as "Toray cellulose sponge" by Toray Fine Chemical Co., Ltd. can be used.

  Cellulose sponge is generally formed into a block shape. In the present invention, it is preferable to use a cellulose sponge formed by slicing the cellulose sponge. Here, the diameter and porosity (bubble volume / total volume) of the fine bubbles of the cellulose sponge can be adjusted by the particle size and blending amount of the crystal mirabilite, and are not particularly limited. Cellulose sponge preferably has a fine bubble diameter of 100 to 1500 μm and a porosity of 20 to 80%.

  FIG. 1 shows an example of a squeegee A produced using such a sheet 1 of cellulose sponge. A squeegee A is formed in a T-shape by providing a sheet attachment portion 3 at the tip of the grip 2 at right angles. is there. The seat mounting portion 3 is formed in a channel shape that opens downward, and includes a holding portion 3a having a C-shaped cross section and a pair of parallel flanges 3b and 3b provided on both lower end edges of the holding portion 3a so as to protrude downward. Formed from. Then, the cellulose sponge sheet 1 is folded into two or four to form an elongated band, and the cellulose sponge sheet 1 is inserted into the sheet mounting portion 3 so that the folded side portion is accommodated in the holding portion 3a. The squeegee A is formed by projecting the side end portion on the long side of the sponge sheet 1 from the opening between the flanges 3b and 3b over the entire length. At this time, by inserting a rod-like stopper 4 into the bent portion of the cellulose sponge sheet 1 in the portion accommodated in the holding portion 3a and increasing the diameter of the portion in the holding portion 3a, the cellulose sponge sheet 1 is pulled out. The sheet can be attached to the sheet attaching portion 3 without detachment, and the cellulose sponge sheet 1 can be replaced with the sheet attaching portion 3 by removing the stopper 4.

  Next, the coating method of this invention performed using said cellulose sponge is demonstrated.

  The coating liquid is not particularly limited. For example, a coating solution prepared by dissolving or dispersing a weather resistance component or an antifouling component in water or an alcohol solution dissolved in alcohol is used. Can be used.

  First, a coating liquid is applied to the surface to be coated, such as an outer wall of a building or a window glass. The coating solution is applied by a contact method, not a non-contact method such as spraying. The coating tool is coated on the coated surface by bringing the coating tool containing the coating solution into contact with the coated surface. Application is performed by moving the liquid. By applying the coating liquid in a contact manner, the coating liquid should not be blown away even if the work is performed in a strong outdoor location such as a building wall. It is something that can be done.

  There are various types of contact-type coating tools such as a paint roller and a brush, but it is preferable to use a paint roller because it can be applied quickly over a large area. When the paint roller 5 as shown in FIG. 2 is used, the coating liquid can be applied to the entire surface to be coated by including the coating liquid in the roller 6 and rolling the roller 6 along the surface to be coated. It can be done.

  Thus, in the state which applied the coating liquid to the to-be-coated surface using the paint roller 5 etc., the film thickness of application | coating is not uniform. Normally, the coating thickness tends to be uneven, such that the coating start portion is thick and the coating finish portion is thin. When the coating is performed in an overlapping manner, the coating film is thicker than the other portions where the coating liquid is applied in layers. Furthermore, dripping also occurs in the thick part of the coating film.

  Next, after the coating liquid is applied to the surface to be coated in this way, the coating liquid is spread by rubbing the surface to be coated with the sheet 1 of squeegee A cellulose sponge. At this time, the cellulose sponge sheet 1 of the squeegee A is used in a state in which the above coating liquid is immersed and contained, and the cellulose sponge sheet 1 protruding downward from the sheet attachment portion 3 of the squeegee A. The coating applied to the coated surface by moving the squeegee A in the direction perpendicular to the longitudinal direction of the leading edge of the cellulose sponge sheet 1 with the leading edge of the sheet in contact with the coated surface over the entire length The liquid is spread with a sheet 1 of cellulose sponge.

  By spreading the coating liquid applied to the surface to be coated with the cellulose sponge sheet 1, the coating liquid in the thick part of the coating liquid applied to the surface to be coated is the thin part. The coating film thickness of the coating liquid can be made uniform. The cellulose sponge sheet 1 is pre-impregnated with the coating liquid, so that the coating liquid applied to the surface to be coated is not absorbed by the cellulose sponge sheet 1 and the thick part is thick. The coating liquid can be spread to a uniform film thickness without causing the coating liquid to move excessively to a thin film thickness portion and causing the film thickness to become non-uniform.

  Here, since the cellulose sponge has a hydrophilic group, it is easy to be familiar with water, and since it has self-water absorption and self-water retention due to capillary action due to fine communicating bubbles, the absorbed moisture can be held without flowing down. It can be done. Therefore, when the coating liquid prepared as an aqueous solution is soaked into the cellulose sponge sheet 1, the coating liquid does not hang down from the cellulose sponge sheet 1, and the cellulose sponge sheet 1 is applied to the surface to be coated. The coating liquid soaked in the cellulose sponge sheet 1 is pushed out from the cellulose sponge sheet 1 when the coating liquid is spread on the sheet, and the coating film thickness of the coating liquid becomes non-uniform. There is nothing to do.

  As described above, the coating liquid is spread with the cellulose sponge sheet 1 and coated on the surface to be coated with a uniform thickness, and then dried to form a coating film having weather resistance and antifouling effect. Can be formed. Since the coating film has a uniform film thickness, no interference fringes are generated by the interference action of light, and the appearance of a building or the like can be prevented from being damaged.

  In the above embodiment, the cellulose sponge sheet 1 is attached to the squeegee A for use. However, the present invention is not limited to this, and the cellulose sponge is used in a plate-like form. In some cases, a block-like cellulose sponge can be used as it is without being attached to a tool such as squeegee A.

  In addition, the surface to be coated with the coating liquid is not limited to the wall surface of the building or the window glass as described above, but can be any surface such as a ship bottom, a vehicle body, a ceiling inside the building, a floor, or a wall surface. Any material such as concrete, tile, glass, metal such as aluminum, a siding surface, or a painted surface can be applied.

  The invention will now be illustrated by examples.

Example 1
As the coating solution, a weathering / antifouling ceramic coating aqueous solution having a titania phosphate composition was used. Further, as a cellulose sponge sheet, a “Toray Cellulose Sponge Type PC107” manufactured by Toray Fine Chemical Co., Ltd. (average diameter of fine bubbles 1500 μm, porosity 50%) is sliced to a thickness of 3 mm as shown in FIG. Squeegee A was prepared.

And the coating liquid was apply | coated to the wall surface of the tile of a building with the application amount of 30 g / m < ² > using the paint roller 5 like FIG.

  Next, after immersing the squeegee A cellulose sponge sheet 1 in the coating solution to immerse the coating solution, the coating solution applied to the wall surface of the building is stretched with the squeegee A cellulose sponge sheet 1 to form a coating. The coating thickness of the liquid was made uniform.

  Thereafter, the coating liquid applied to the wall surface of the building after being left for 48 hours was dried to form a coating film. When this coating film was observed, interference fringes were not generated, and it was confirmed that the film thickness was uniform.

(Comparative Example 1)
In the same manner as in Example 1, the coating liquid was applied to the wall surface of the building tile using the paint roller 5, and the coating liquid was then left to stand for 48 hours to form a coating film. When this coating film was observed, irregularities and interference fringes were generated due to liquid dripping, and the film thickness was uneven.

(Comparative Example 2)
In the same manner as in Example 1, after applying the coating liquid to the wall surface of the tile of the building using the paint roller 5, the squeegee A that remains dry without immersing the coating liquid in the cellulose sponge sheet 1 is obtained. Used to stretch the coating solution applied to the wall of the building.

  Thereafter, the coating liquid applied to the wall surface of the building after being left for 48 hours was dried to form a coating film. When this coating film was observed, interference fringes were generated and the film thickness was uneven.

It is a perspective view which shows an example of a squeegee. It is a perspective view which shows an example of a paint roller.

Explanation of symbols

1 Sheet of cellulose sponge A A squeegee

Claims (2)

  A coating method comprising: coating a coating liquid on a surface to be coated and then spreading the coating liquid coated on the surface to be coated with a cellulose sponge soaked with the coating liquid.   The coating method according to claim 1, wherein a squeegee having a cellulose sponge sheet widely attached in a strip shape at the tip is used, and the coating liquid is spread at the tip of the cellulose sponge sheet of the squeegee.

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