JP5166336B2 - Coating method - Google Patents

Description

  The present invention relates to a method for forming a coating film in a building or a civil engineering structure.

  Conventionally, coating materials containing various aggregates are often used as surface decorative materials for buildings, civil engineering structures, and the like. Among these, the coating material containing scaly aggregate can express a unique variety of feeling by a relatively large spotted pattern, and can also form a finished surface such as a natural stone tone.

  As an example of such a coating material, Japanese Patent Laid-Open No. 9-3368 (Patent Document 1) describes a granite-like coating material containing resin flakes, a binder, aggregate fine particles, and additives. Japanese Laid-Open Patent Publication No. 2002-179999 (Patent Document 2) describes a pseudo stone-like coating material containing a film-like chip, colored silica sand, a binder and the like. JP-A-2006-36872 (Patent Document 3) describes a paint containing flaky flakes, cold water sand, synthetic resin emulsion and the like.

Japanese Patent Laid-Open No. 9-3368 Japanese Patent Laid-Open No. 2002-179999 JP 2006-36872 A

  In the coating materials of each of the above patent documents, granular aggregates such as colored silica sand and cold water sand are mixed together with scaly aggregates such as resin flakes. Such a granular aggregate plays a role of constituting the background color of the scaly aggregate in the formed coating film. However, when coating is performed using the coating materials of each of the above-mentioned patent documents, granular aggregates are scattered above the scaly aggregates, and the design properties of the scaly aggregates are likely to be unclear. In order to expose the scaly aggregate on the outermost surface of the coating film and to clarify its design, it is sufficient to employ means for polishing the coating film, but this increases the number of work steps and takes time.

  This invention is made | formed in view of such a problem, It aims at providing the simple method which can clarify the design property by a scaly aggregate, and can obtain the finish with high aesthetics. Is.

  As a result of intensive studies to achieve the above object, the present inventor has conceived a method of using a coating material mixed with scaly aggregate having a specific surface property and finishing it with a tool such as a trowel. The invention has been completed.

That is, the present invention has the following characteristics.
1. An aqueous resin, a granular aggregate having an average particle diameter of 0.01 to 0.8 mm, an average particle diameter of 1 to 20 mm, and a scaly aggregate having a contact angle with respect to water of a planar portion of 90 ° or more; and Water as an essential component, containing 100 to 2000 parts by weight of the granular aggregate and 0.1 to 500 parts by weight of the scaly aggregate with respect to 100 parts by weight of the solid content of the aqueous resin, water in the coating material A coating material having a content ratio of 5 to 35% by weight is applied to a base material and finished while pressing the coated surface using at least one selected from a trowel, a spatula, a roller brush, and a brush. A method of forming a coating film characterized by

  According to the present invention, the scaly aggregate is easily exposed on the outermost surface of the coating film, and the design properties of the scaly aggregate can be clarified. In the present invention, a process such as polishing of the coating film is unnecessary, and a finish with high aesthetics can be obtained by a relatively simple method.

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

  The coating film forming method of the present invention is suitable for a surface makeup method in buildings, civil engineering structures, and the like. The base material to be painted is not particularly limited as long as it can be used in the field of construction and civil engineering. Specific examples include concrete, mortar, porcelain tile, fiber-mixed cement board, cement calcium silicate board, slag cement pearlite board, ALC board, siding board, extruded board, steel sheet, gypsum board, plywood, plastic board, etc. It is done. These substrates may already be provided with a coating film, wallpaper or the like. Further, it may be treated with a surfacer, filler, putty or the like.

In the present invention, a coating material containing water-based resin, granular aggregate, scaly aggregate, and water as essential components is applied to the base material as described above.
Of these, the aqueous resin acts as a binder, and a water-soluble resin and / or a water-dispersible resin can be used. Usable types of resin include, for example, cellulose, polyvinyl alcohol, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, silicone resin, acrylic resin, urethane resin, acrylic silicon resin, fluorine resin, etc. Or these composite systems etc. can be mentioned. These may have crosslinking reactivity. Moreover, the form of aqueous resin is not specifically limited, Either 1 liquid type and 2 liquid type may be sufficient.

  As the granular aggregate in the coating material of the present invention, one having an average particle diameter of 0.01 to 0.8 mm is used. Such granular aggregate mainly contributes to the overall color tone of the coating film. As the granular aggregate, at least one selected from natural aggregates such as natural stones and pulverized natural stones and artificial aggregates such as colored aggregates can be suitably used. Specifically, for example, marble, granite, serpentine, granite, fluorite, cryolite, feldspar, quartzite, quartz sand, and pulverized products thereof, ceramic pulverized product, ceramic pulverized product, glass pulverized product, glass beads, resin Examples thereof include pulverized products, resin beads, and metal particles. Furthermore, those with a color coating on these surfaces can also be used. In the present invention, various colors can be expressed by appropriately using two or more kinds of such granular aggregates in combination. In addition, the granular aggregate in this invention has a shape different from the scale-like aggregate mentioned later. The average particle diameter of the granular aggregate is a value obtained by performing sieving using a metal mesh sieve defined in JIS Z8801-1: 2000 and calculating the average value of the weight distribution.

  The mixing ratio of the granular aggregate is usually 100 to 2000 parts by weight, preferably 200 to 1500 parts by weight, and more preferably 300 to 1200 parts by weight with respect to 100 parts by weight of the solid content of the aqueous resin. If the mixing ratio of the granular aggregate is within such a range, it is preferable in terms of coating workability at the time of coating film formation, design properties of the formed coating film, crack prevention properties, and the like.

  As the scaly aggregate in the present invention, those having an average particle diameter of 1 to 20 mm and a contact angle with respect to water of the planar portion (hereinafter also simply referred to as “contact angle”) of 90 ° or more are used. Such a scaly aggregate plays a role of improving the aesthetics of the coating film by forming a spot-like pattern or the like in the planar portion. In the present invention, since the scaly aggregate has a specific water-repellent performance, the design of the scaly aggregate can be clarified in the finished coating film.

The average particle diameter of the scaly aggregate is 1 to 20 mm, which is relatively larger than the above-mentioned granular aggregate. When normal scaly aggregates are used, even if finishing with a trowel or the like, granular aggregates are likely to remain above the surface area of the scaly aggregates, which impairs the design of the scaly aggregates There is a fear. On the other hand, in the present invention, due to the water-repellent performance of the scaly aggregate, the action of eliminating the granular aggregate from above the scaly aggregate during finishing with a trowel or the like is exhibited, and the planar portion of the scaly aggregate It becomes easy to be exposed to the coating film outermost surface. In addition, the planar site | part of scaly aggregate is two surfaces up and down when a scaly aggregate is set | placed on the horizontal surface in the stable state.
The contact angle of the surface portion of the scaly aggregate needs to be 90 ° or more, preferably 110 ° or more, and more preferably 130 ° or more. In addition, the contact angle with respect to water in the present invention is an angle formed between the water droplet and the sample surface when the water droplet is dropped on the sample surface, and can be measured with a contact angle meter.

When the average particle size of the scaly aggregate is less than 1 mm, it is difficult to make use of the design properties of the scaly aggregate, and when it exceeds 20 mm, there is a risk of hindering the workability of painting.
In addition, the average particle diameter of scaly aggregate is the average value of the major axis of the planar part. The ratio of the major axis to the minor axis (major axis / minor axis) of the scaly aggregate is usually about 1/1 to 1/10 (preferably 1/1 to 1/5). The ratio of the average particle diameter to the average thickness (average particle diameter / average thickness) in the scaly aggregate is usually about 2/1 to 200/1 (preferably 3/1 to 150/1). The average thickness can be measured with a micrometer.

  Examples of such scaly aggregates include (i) a material having a contact angle of 90 ° or more, or (ii) a material obtained by treating base particles with a coating agent having a contact angle of 90 ° or more. Can be used. Among these, the base particles (ii) include, for example, inorganic particles such as mica, glass flakes, shell pieces, metal pieces, or rubber pieces, resin film pieces, plastic pieces, wood pieces and the like having a contact angle of 90 ° or more. Things can be used. Examples of the coating agent having a contact angle of 90 ° or more include wax-based water repellents such as paraffin wax, polyethylene wax, and acrylic / ethylene copolymer wax; silicone resin, acrylic silicone resin, polydimethylsiloxane, and alkylalkoxysilane. Silicone water repellents such as fluorine-based water repellents such as perfluoroalkyl carboxylates, perfluoroalkyl phosphates, perfluoroalkyltrimethylammonium salts, or composites of these water repellents with various resins Is mentioned. These coating agents may contain a colorant such as a color pigment and a dye, and a desired color tone can be imparted to the scaly aggregate by appropriately selecting the colorant. In (ii), a coating film of the coating agent may be formed on the surface of the base particle by a known method.

  The scaly aggregate is usually mixed at a ratio of 0.1 to 500 parts by weight, preferably 0.5 to 200 parts by weight, and more preferably 1 to 100 parts by weight with respect to 100 parts by weight of the solid content of the aqueous resin. If the mixing ratio of the scaly aggregate is within such a range, it is preferable in terms of painting workability, designability, and the like.

  The coating material in the present invention contains 5 to 35% by weight of water. When the water content ratio is within such a range, it is possible to obtain a stable effect in coating workability, designability, and the like. When the water content is outside the above range, the effects of the present invention are difficult to obtain, and it is difficult to ensure coating workability, particularly workability during finishing with a trowel, etc. Tends to be insufficient. In the present invention, in the coating material used for coating, the water content may be in the above range. Dilution etc. can also be suitably performed at the time of coating so that water content may be in the said range.

  Although the coating material in this invention can be manufactured by mixing the said component uniformly by a well-known method, the other component which can be normally used for a coating material can also be mixed as needed. Examples of such components include coloring pigments, extender pigments, thickeners, film-forming aids, leveling agents, plasticizers, antifreezing agents, pH adjusters, diluents, antiseptics, antifungal agents, and algae. Agents, antibacterial agents, dispersants, antifoaming agents, ultraviolet absorbers, antioxidants, light stabilizers, fibers, catalysts, crosslinking agents and the like. Further, various aggregates such as granular aggregate having an average particle diameter exceeding 0.8 mm can be mixed as long as the effect of the present invention is not impaired.

  In the present invention, the above-described coating material is applied to the base material, and finishing is performed using one or more selected from a trowel, a spatula, a roller brush, and a brush while pressing the coated surface. In the present invention, in this step, the coating surface (the surface of the coating film before drying) of the coating material applied to the base material is smoothed while being pressed using a tool such as a trowel, thereby providing a scaly aggregate. Becomes easy to arrange along the coating film. Furthermore, due to the surface properties of the scaly aggregate described above, the scaly aggregate existing in the vicinity of the coating surface (surface side of the coating film) can be easily exposed on the outermost surface of the coating film, and the scaly shape in the finished coating film The design of the aggregate can be clarified. When the contact angle of the scaly aggregate is lower than 90 °, even if finishing with a trowel or the like, it is easy to remain in a state where granular aggregates are scattered above the scaly aggregate, and the design by the scaly aggregate Tend to be unclear.

As the iron, for example, a gold iron or a wooden iron can be used. As the spatula, for example, a gold spatula or a wooden spatula can be used. As the roller brush and brush, those made of various fibers can be used.
Finishing with such a tool may be performed after the coating material is applied and before the coating material is dried. In the present invention, in this step, it is desirable to perform finishing by applying water to a tool such as a iron. Thereby, working efficiency increases and it becomes easy to obtain the effect of the present invention.

In addition, when applying the coating material to the substrate (distribution coating), in addition to using a trowel, a spatula, etc., for example, spraying with various guns, roller coating with a porous roller brush, or the like may be employed.
The coating amount of the coating material is usually about 0.5 to 8 kg / m ² (preferably 1 to 5 kg / m ² ).
The coating film after finishing may be usually dried at room temperature (about 5 to 35 ° C.), but may be performed at a high temperature as necessary.

  In the present invention, after the coating material is dried, a clear paint can be applied as necessary. As such a clear paint, for example, a paint using an acrylic resin, a urethane resin, an acrylic silicon resin, a fluororesin or the like as a binder can be used. Such a clear paint may have a gloss level adjusted with a known matting agent or the like.

  Examples are given below to clarify the features of the present invention.

Example 1
1050 parts by weight of granular aggregate, 20 parts by weight of scaly aggregate A, 280 parts by weight of water, 8 parts by weight of a film-forming aid, with respect to 200 parts by weight of water-dispersible resin (100 parts by weight of solid content), 2 parts by weight of a thickener and 4 parts by weight of an antifoaming agent were mixed and uniformly stirred by a conventional method to prepare a coating material A. The water content in the coating material A is about 24% by weight. In addition, the raw material used for manufacture of a coating material is as follows.

-Water dispersible resin: acrylic resin emulsion (solid content 50%)
・ Granular aggregate: colored silica sand (reddish brown, average particle diameter 70 μm)
Scale-like aggregate A: Colored coating product of resin film piece (water-soluble acrylic resin / silicone water repellent / coating with white colorant mainly composed of titanium oxide (solid content weight ratio 87: 8: 5)) Treated product), average particle size 8mm, contact angle 103 °
Scale-like aggregate B: Colored coating product of resin film piece (water-soluble acrylic resin / silicone water repellent / coating with white colorant mainly composed of titanium oxide (solid content weight ratio 70: 25: 5) Processed product), average particle size 8mm, contact angle 118 °
Scale-like aggregate C: Colored coating product of resin film piece (water-soluble acrylic resin / silicone water repellent / coating with white colorant mainly composed of titanium oxide (solid content weight ratio 55: 40: 5)) Treated product), average particle size 8mm, contact angle 132 °
Scale-like aggregate D: Colored coating treatment product of resin film piece (coating treatment product with white colorant mainly composed of water-soluble acrylic resin / titanium oxide (solid content weight ratio 95: 5)), average particle diameter 8 mm , Contact angle 72 °
-Film-forming aid: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate-Thickener: Hydroxyethyl cellulose powder-Antifoaming agent: Silicone-based antifoaming agent

The coating material A obtained by the above method was applied (distributed) to a 180 cm × 90 cm slate plate with a trowel, and then smoothed evenly while pressing the coating surface using the same trowel. At this time, the coating amount of the coating material was set to 1.2 kg / m ² . After painting, it was dried at room temperature for 48 hours. When the appearance of the formed coating film was confirmed, the colored silica sand particles did not remain so much above the scaly aggregate, and the design of the scaly aggregate was outstanding.

(Example 2)
A coating material was produced in the same manner as in Example 1 except that scaly aggregate B was used instead of scaly aggregate A (coating material B), and coating was performed. In Example 2, almost no colored silica sand particles remained above the scaly aggregate, and the design of the scaly aggregate was conspicuous, which was better than that of Example 1.

(Example 3)
A coating material was produced in the same manner as in Example 1 except that scaly aggregate C was used instead of scaly aggregate A (coating material C), and coating was performed. In Example 3, almost no colored silica sand particles remained above the scaly aggregate, and the design of the scaly aggregate was conspicuous, which was a better state than that of Example 2.

Example 4
A coating material was produced in the same manner as in Example 1 except that the scaly aggregate C was used instead of the scaly aggregate A (coating material C). The coating material C was applied (distributed) to a 180 cm × 90 cm slate plate with a trowel, and then smoothed while pressing the coated surface using a wool roller with water. At this time, the coating amount of the coating material was set to 1.2 kg / m ² . After painting, it was dried at room temperature for 48 hours. When the appearance of the formed coating film was confirmed, as in Example 3, almost no colored silica sand particles remained above the scaly aggregate, and the design of the scaly aggregate was outstanding.

(Comparative Example 1)
A coating material was produced in the same manner as in Example 1 except that scaly aggregate D was used instead of scaly aggregate A (coating material D), and coating was performed. In Comparative Example 1, many colored silica sand particles remained above the scaly aggregate.

Claims (1)

An aqueous resin, a granular aggregate having an average particle diameter of 0.01 to 0.8 mm, an average particle diameter of 1 to 20 mm, and a scaly aggregate having a contact angle with respect to water of a planar portion of 90 ° or more; and Water as an essential component, containing 100 to 2000 parts by weight of the granular aggregate and 0.1 to 500 parts by weight of the scaly aggregate with respect to 100 parts by weight of the solid content of the aqueous resin, water in the coating material A coating material having a content ratio of 5 to 35% by weight is applied to a base material and finished while pressing the coated surface using at least one selected from a trowel, a spatula, a roller brush, and a brush. A method of forming a coating film characterized by