JP2010221149A - Method of spraying coating material to building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of spraying a coating material to a building which can form a wall surface of the building, using a wall facing material of the building with the same texture and beautiful appearance as actual limestone found in the nature. <P>SOLUTION: A first spray coating material 7 of pale beige color is applied to the surface of a resin mortar 23 formed on the wall surface 22 of a building, and thus a spray coating surface is formed. A second red spray coating material 8 and a third white spray coating material 9 are each applied sparsely and in the form of globule, to the spray coating surface constituted of the first spray coating material 7. Further, before the first to the third spray coating material 7, 8 and 9 could dry, the first to the third spray coating material 7, 8 and 9 are moved, with the help of a trowel, in one direction within the plane of the spray coating surface. Consequently, the top layer of the coating surface to which the second and the third spray coating material 8 and 9 are applied sparsely, is levelled off. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a spray coating method for buildings. More specifically, the present invention relates to a spray coating method for a building, which can obtain a wall surface of a building made of a wall material for a building having the same texture and aesthetics as natural stone, particularly limestone.

  Conventionally, natural stone is often used as a finish for building walls and the like because of its beauty and weather resistance. For example, there is a method in which natural stone is used as it is for a wall surface or a pillar, or a thin plate is attached to a wall surface or the like.

As a method of applying a pattern or the like to a wall surface of a building, for example, a method of applying lysine (a composition containing aggregate) and a paint material by a trowel coating method, a roller coating method, a spray coating method, etc. There is. The trowel coating method is a method in which a material is transferred to the surface of a building and extended using a trowel. The roller coating method is a method in which a material is transferred to the surface of a building using a roller or a trowel and extended by a roller. Since these are performed manually, a large pattern can be applied, but they are not suitable for thick coating or large area coating. The spray coating method is a method in which a material is ejected from a spray gun using the force of compressed air and applied (see, for example, Patent Document 1). Here, in the spray coating method using a lysine-based material, the material includes a granular material such as ceramic aggregate, natural stone aggregate, fired aggregate, and synthetic resin, so that thick coating to a certain extent is possible. Become.
Japanese Patent Publication No. 5-9587

  However, the conventional spray painting method has not yet achieved a wall surface of a building made of a wall material for buildings having the texture and beauty of an actual limestone existing in nature.

  Then, in view of this point, the present inventor has intensively studied to obtain a wall surface of a building made of a wall material for a building that is closer to an actual limestone existing in nature, and has come to the present invention.

  The present invention has been made to solve the above-mentioned problems in the prior art, and it is possible to obtain a wall surface of a building made of a wall material for a building having the same texture and aesthetics as an actual limestone existing in nature. The purpose is to provide a method for spray painting of buildings.

  In order to achieve the above object, a method of spraying a building according to the present invention includes spraying a spray material of a predetermined color including aggregate and synthetic resin onto a wall surface of a building to form a spray coating surface. And a step of sparsely spraying a plurality of types of spray materials having different colors from the spray material of the predetermined color, including aggregate and synthetic resin on the spray coating surface, and the spray material of the predetermined color and the plurality A step of leveling the surface of the spray coating surface sprayed with the plurality of types of spray materials by moving the seed spray material along one direction in the surface of the spray coating surface. It is characterized by.

  According to this spray coating method of a building, a plurality of types of spray materials having different colors from the spray material of the predetermined color forming the spray paint surface are sparsely sprayed on the spray paint surface, and the spray material of the predetermined color is sprayed. And the plurality of types of spraying materials are moved along one direction in the surface of the spray coating surface to level the surface of the spray coating surface on which the plurality of types of spraying materials are sprayed sparsely. Thus, the plurality of types of spray materials sprayed sparsely move in the vicinity of the surface of the spray painted surface, and a light streak pattern peculiar to limestone is formed on the surface of the spray painted surface. That is, according to the spray coating method of a building, a wall material for a building having the same texture and aesthetics as an actual limestone existing in nature can be obtained.

  Natural limestone is not suitable for exterior materials because it is vulnerable to acid rain, and is currently used mainly for interiors such as entrances. In this respect, according to the spray coating method of a building of the present invention, a material suitable for the exterior material is used as the material, so that a limestone-like outer wall can be realized.

In the architectural spray coating method of the present invention, it is preferable to spray the spray material of the predetermined color using a spray gun having a small diameter and a high spray pressure. According to this preferred example, the spray material forming the spray coating surface is crushed on the wall surface of the building, and a smooth and uniform spray coating surface can be formed with a thin thickness (a small amount of spray material). That is, the wall surface of a building can be constructed at low cost. In addition, as the spray material, those containing aggregate and synthetic resin are used, and these have flexibility and adhesive strength, so there is a risk that the spray material sprayed will peel off or fall off the wall of the building Absent. In this case, the spray gun preferably has a diameter of 5 to 8 mm and a blowing pressure of 5 to 7 kg / cm ² .

Moreover, in the building spray coating method of the present invention, it is preferable that the sphere equivalent diameter of the plurality of types of spray materials is 2 to 3 mm, and the spray density is 500 to 12000 pieces / m ² .

  Moreover, in the building spray coating method of the present invention, it is preferable to use a light-colored spray material as the predetermined color spray material. In this case, the light color is preferably a light beige color. In this case, it is preferable to use a red spray material and a white spray material as the plurality of types of spray materials.

  Moreover, it is preferable that the method for spraying a building according to the present invention further includes a step of polishing the surface of the leveled spray coating surface. According to this preferable example, it is possible to obtain a wall material for a building having a texture and an appearance close to those of natural limestone with less irregularities.

  In the building spray coating method of the present invention, it is preferable to use a spray material containing 5 to 90 parts by weight of aggregate and 10 to 95 parts by weight of synthetic resin as each of the spray materials.

  Moreover, in the spray coating method for a building of the present invention, it is preferable to use at least one selected from the group consisting of ceramic aggregate, natural stone aggregate, and baked aggregate as the aggregate.

  In the building spray coating method of the present invention, an acrylic resin emulsion is preferably used as the synthetic resin.

  Moreover, in the building spray coating method of the present invention, it is preferable to apply a top coat to the surface of the leveled spray coating surface with a transparent resin. According to this preferable example, the durability and weather resistance of the wall material for buildings can be improved, and contamination can also be prevented. In this case, it is preferable to use an acrylic-silicon-based paint or a fluorine-based paint as the transparent resin. In addition, if a hydrophilic material is used as the top coat in this way, dust does not easily adhere to the top coat, and the dust once attached can be easily washed away with rainwater or the like.

  ADVANTAGE OF THE INVENTION According to this invention, the spray coating method of the building which can obtain the wall surface of the building which consists of the wall surface material for buildings which has the same texture and aesthetics as the actual limestone which exists in nature can be provided.

  Hereinafter, the present invention will be described more specifically using embodiments.

As the spray material, the one prepared in the following components was used. That is,
(1) Ceramic aggregate 61.60 parts by weight (2) Acrylic resin emulsion (solid content 50%) 25.20 parts by weight (3) Thickener (hydroxymethylcellulose) 11.35 parts by weight (4) pH adjuster ( (Ammonia water) 0.17 parts by weight (5) Defoamer (alcohol) 0.03 parts by weight (6) Film-forming aid (alcohol) 0.39 parts by weight (7) Water 1.26 parts by weight Workability For the convenience of storage and storage, thickeners, pH adjusters, antifoaming agents, film-forming aids and the like are mixed, but they are not essential components of the present invention. That is, the spraying material used in the present invention is only required to contain aggregate and synthetic resin, and preferably contains 5 to 90 parts by weight of aggregate and 10 to 95 parts by weight of synthetic resin. The film-forming aid is for lowering the temperature of the emulsion transparent film-forming.

  As the synthetic resin, in addition to the acrylic resin emulsion, other emulsion type, epoxy type and urethane type can also be used.

  Here, ceramic aggregate is used as the aggregate, but natural stone aggregate or fired aggregate may be used in addition to the ceramic aggregate.

  The ceramic aggregate is obtained by mixing an inorganic pigment having an appropriate color with clay, for example, iron oxide, zinc oxide, and the like, firing it at 1200 to 1400 ° C., and crushing it. Natural stone aggregates are obtained by pulverizing and classifying natural stones, with white sand using quartz sand, marble granules, cold water stone, etc., and black using Mino black. The calcined aggregate consists of natural stone granules (usually silica sand is often used), inorganic pigments (usually metal oxides are used, titanium oxide as white, titanium yellow as yellow, cobalt as blue, and green And chrome and carbon as black) are mixed and baked on the surface of natural stone at 800 to 1000 ° C. Many of the aggregates that are actually used are this burned aggregate. In addition, when making at the temperature of 100-300 degreeC, a cold water stone may be used.

As the aggregate particle size distribution, the following was adopted from the strength and aesthetics of the building wall material obtained by spraying the spraying material on the wall surface of the building. That is,
Mesh distribution 3-20 30% by weight
20-200 40% by weight
200-350 30% by weight
The mesh refers to the number of meshes per inch (25.4 mm).

  In the present embodiment, the first spraying material having the above components and using a light-colored ceramic aggregate as a spraying material for forming the sprayed coating surface (spraying material for spraying coating surface formation) Is used. Here, as the ceramic aggregate of the first spray material, a light beige one was used. Further, as a plurality of types of spraying materials to be sprayed sparsely on the spray coating surface, the second and third types using ceramic aggregates having the above-described components and having different colors from the ceramic aggregates of the first spraying material. Spray material is used. Here, as the ceramic aggregate of the second spray material, a red one was used. Moreover, as a ceramic aggregate of the third spray material, a white one was used.

  Hereinafter, the method to obtain the wall material for buildings by spraying the first to third spray materials as described above on the wall surface of the building will be described. FIG. 1 is a horizontal sectional process diagram illustrating a building spray coating method according to an embodiment of the present invention, FIG. 2 is a flowchart illustrating a building spray coating method according to an embodiment of the present invention, and FIG. The top view which shows the wall surface material for buildings obtained using the spray coating method of the building in one embodiment of this invention, FIG. 4 is the spray material (first 1 FIG. 5 is a perspective view showing a three-head spray gun used for spraying spraying material), and FIG. 5 shows spraying materials (second and third spraying materials) sprayed sparsely on the spray coating surface in the method. It is a schematic block diagram which shows the apparatus used.

As shown in FIG. 4, the three-head spray gun is provided with three tanks 1, 2, and 3, and the first spray material 7 of the same color is separately added to each tank 1, 2, and 3. It can be accommodated. The tanks 1, 2, and 3 are provided with ejection nozzles 4, 5, and 6, respectively, and the first spray material 7 in the tanks 1, 2, and 3 is ejected by compressed air. , 6 can be ejected respectively. Here, the diameters of the ejection nozzles 4, 5 and 6 are 5 to 8 mm, and the blowing pressure is set to ⁵ to 7 kg / cm ² . Further, the angles of the ejection nozzles 4, 5, 6 are adjusted so as to be concentrated at almost one point.

  When spraying the first spray material 7, it is not always necessary to use the three-head spray gun as described above, and for example, a hand-held single-head gun or the like can be used.

In FIG. 5, reference numeral 11 denotes a spray gun, and the spray gun 11 is prepared by a hopper 13 from a device 12 for supplying a spray material (second or third spray material) sprayed sparsely on a spray coating surface. The second or third spray material is pumped through the conduit 14. The second or third spray material is sprayed onto the spray coating surface with compressed air having a spray pressure of ^{2 to 3} kg / cm ² generated using an air compressor (not shown).

  The spray gun 11 is formed so that the diameter of the coating nozzle 15 is 5 to 7 mm, and the coating nozzle 15 is opened and closed by retreating or advancing the air nozzle (not shown) (so-called needle valve system). ). That is, a double-structured air nozzle is attached to a piston (not shown). By switching the switching valve 16, the piston moves backward or forward, and compressed air and the second or third spray material are injected or Blocked.

  When the switching valve 16 is operated by a flow switch (not shown) and compressed air is allowed to flow through the flow path 17, the piston in the spray gun 11 moves backward in the right direction in FIG. 5, and the air nozzle attached to the piston Retreat in conjunction. Thereby, the coating nozzle 15 opens. Simultaneously with the opening of the coating nozzle 15, the compressed air that has flowed through the flow path 17 flows through the flow path 18, and this compressed air is supplied to the operating portion of the shut-off valve 19 to open the shut-off valve 19. As a result, the compressed air supply path 20 and the compressed air supply path 21 to the air nozzle are conducted, and compressed air is ejected from the coating nozzle 15 through the compressed air supply path 21 through the air nozzle. At this time, since the coating nozzle 15 is open, the second or third spraying material is supplied to the coating nozzle 15, and the second or third spraying material is applied by the compressed air supplied from the air nozzle. Is injected from.

  When spraying the second or third spray material, it is not always necessary to use the spray gun 11 as described above. For example, a hand-held single-head gun or the like can also be used.

  First, as shown to Fig.1 (a), the wall surface 22 of a building is planarized by apply | coating the resin mortar 23 with a thickness of about 1 mm on the wall surface (frame) 22 of a building using a gold trowel. The base was adjusted (Step 1 in FIG. 2). Next, a sealer (not shown) was sprayed on the resin mortar 23 using an air spray (Step 2 in FIG. 2). As the sealer, Shinto Concrete G Sealer manufactured by Shinto Paint Co., Ltd. was used. Next, a joint color was applied on the resin mortar 23 sprayed with a sealer (step 3 in FIG. 2).

  Next, as shown in FIG.1 (b), the joint stick 10 which consists of foamed resin was affixed on the resin mortar 23 which sprayed the sealer and apply | coated the joint color (step 4 of FIG. 2). Here, an adhesive is applied to the back and front surfaces of the joint rod 10, and a release paper for preventing adhesion is further attached to the back and front surfaces. For this reason, when sticking the joint stick 10 on the resin mortar 23, the release paper on the back side of the joint stick is peeled off.

Next, as shown in FIG. 1C, a thin beige first spraying material 7 is applied on the resin mortar 23 to which the joint rod 10 has been pasted using the three-head spray gun shown in FIG. As a result, a spray-painted surface was formed (step 5 in FIG. 2). In this case, the diameter of the ejection nozzles 4, 5 and 6 is 5 to 8 mm, and the blowing pressure is set to ⁵ to 7 kg / cm ² (small diameter and high blowing pressure). It is crushed on the resin mortar 23, and a smooth and uniform sprayed coating surface can be formed with a thin thickness (a small amount of spraying material). That is, the wall surface of a building can be constructed at low cost. The spray amount of the first spray material 7 is
The thickness was 2.0 to 6.0 kg / m ² , and the thickness of the spray coating surface was about 2 mm.

Next, as shown in FIG. 1 (d), the red second spraying material 8 and the white third coating are applied to the spray coating surface made of the first spraying material 7 by using two apparatuses shown in FIG. 5. Each of the spraying materials 9 was sprayed sparsely and in a ball shape (sparsely spraying) (step 6 in FIG. 2). In this case, the sphere equivalent diameters of the second and third spray materials 8 and 9 sprayed in a ball shape were 2 to 3 mm. Moreover, the spray density of the ball-shaped second and third spray materials 8 and 9 is 500 to 12000 pieces / m ² .

  Next, as shown in FIGS. 1D and 1E, before the first to third spraying materials 7, 8, and 9 are dried, the first iron paste (not shown) is used. By moving the third spraying material 7, 8, 9 along the direction from the left side to the right side (in the direction of arrow A in FIG. 1 (d)) within the surface of the spray coating surface (trowel pulling), The surface of the spray coating surface on which the second and third spray materials 8 and 9 were sparsely sprayed was leveled (step 7 in FIG. 2). The iron was pulled twice at the same place. Thereby, the second and third spray materials 8 and 9 sprayed sparsely move in the vicinity of the surface of the spray coating surface, and the surface of the spray coating surface made of the thin beige first spray material 7 is light. A stripe pattern peculiar to limestone made of brown was formed. Here, the reason why the stripe pattern 24 became light brown is that the light beige first spraying material 7, the red second spraying material 8, and the white third spraying material 9 were mixed. . Note that the iron pulling is performed between adjacent joint rods 10 so as to facilitate the work.

  That is, according to the above-mentioned spray coating method for buildings, it is possible to obtain a wall material for buildings having the same texture and aesthetics as an actual limestone existing in nature. Further, since a material suitable for the exterior material is used as the material, a limestone-like outer wall can be realized.

  Next, as shown in FIGS. 1 (e) and 1 (f), the release paper on the surface side of the joint rod 10 is peeled off, and after the first to third spraying materials 7 to 9 are completely dried, the joint rod 10 Was removed (step 8 in FIG. 2). Thereby, the joint 25 was formed.

  Next, using a disk sander (not shown), the surface of the spray-painted surface after the iron was pulled (equalized) was polished (step 9 in FIG. 2). As a result, there was obtained a wall material for a building having a texture and an aesthetic appearance close to those of natural limestone with few irregularities.

  Finally, a super weather resistant top coat (not shown) with a film thickness of 100 μm is applied to the entire surface of the sprayed surface after the iron is pulled (equalized) using a transparent acrylic-silicon-based paint. (Step 10 in FIG. 2). As the acrylic-silicone paint, Hiten Top semi-gloss clear made by Shinto Paint Co., Ltd. was used. Thus, by covering the surface of the finish coating with the super-weather-resistant top coat finish, it is possible to improve the durability and weather resistance of the wall surface material for buildings and to prevent contamination. In addition, although the acrylic-silicone-type coating material is used as a topcoat, it is not necessarily limited to this, What is necessary is just a transparent resin. For example, a fluorine-based paint can be used as the top coat. In this way, if a top coat made of a hydrophilic material is used, it is difficult for dust to adhere thereto, and the once adhered dust can be easily washed away with rainwater or the like.

  Through the above steps, the spray painting of the building was completed, and a limestone-like building wall material was obtained. A part of the appearance of the obtained wall material for a building is shown in FIG. Since the first to third spray materials 7, 8, and 9 used in the present embodiment have flexibility and adhesive strength, the sprayed first to third spray materials 7, 8, 9 are used. There is no risk of peeling or falling off the wall of the building.

  In the present embodiment, as the first to third spraying materials 7, 8, 9 are used light beige, red, and white materials (based on beige), respectively. It is not limited to color combinations. By changing the combination of colors, hundreds of patterns can be created as patterns on the surface of the spray-painted surface, enriching the expression of the walls of the building. That is, for example, a building wall material adapted to the environment can be obtained by using green as a base tone or blue, purple, or pink as a base tone.

  Further, in this embodiment, two types of spray materials having different colors are used as the spray material sprayed sparsely, but the number of types of spray material sprayed sparsely is not particularly limited. For example, three types of spraying materials may be used, or four or more types of spraying materials may be used.

  In the present embodiment, the joint 25 is formed using the joint rod 10, but the joint need not necessarily be formed. However, in order to improve the workability of pulling the iron, it is preferable to have a joint rod as a mark.

  Moreover, in this Embodiment, although the case where it painted or apply | coated directly to the wall surface of a building was mentioned as an example and demonstrated, you may make it form in a panel shape and affix it on the wall surface of a building. The “building” of the present invention includes not only constructed objects but also building materials used for buildings such as panels and boards.

<Specific examples of top coat>
Below, the more specific example of the topcoat suitable for this invention is given, and the coating method is also demonstrated.

  First, an undercoat coating agent containing a siloxane cross-linked acrylic-silicon (silicon) polymer without adding a matting agent is applied to the surface of the sprayed surface after the iron is pulled (equalized), and the undercoat coating layer is applied. Form. When this primer coating agent is applied, a part of the primer coating agent penetrates into the spray layer, but even if it penetrates, the uniformity of the paint composition and the coating film composition is maintained, and a highly durable coating layer is obtained. In addition, since the undercoat coating layer is chemically bonded to the spray layer by a siloxane bond, it has a strong adhesion, maintains a beautiful appearance for a long period of time, and does not require maintenance, resulting in a highly durable coating layer.

  If the primer coating contains a matting agent, when a part of the primer coating enters the spray layer, the matting agent remains in the primer coating layer, resulting in a portion with a high matting agent concentration. Furthermore, it becomes easy to peel off after a long period of time. Further, since the matrix resin component is removed and the aggregate is exposed on the polished spray-painted surface, the undercoat coating agent can easily penetrate. Therefore, when the undercoat coating agent contains a matting agent, the matting agent is unevenly distributed and white color unevenness appears, which impairs the appearance.

  Next, a topcoat coating layer containing a siloxane cross-linked acrylic-silicone polymer added with a matting agent is applied onto the basecoat coating layer to form a topcoat coating layer. In this case, since the adjacent coating layers are also chemically bonded to each other by a siloxane bond, the coating layers are firmly adhered and become a highly durable coating layer. Further, since the coating film is hydrophilic, it is difficult for dust to adhere to it, and the once adhered dust can be easily washed away with rainwater or the like. As a result, it is possible to obtain a building wall material that maintains a beautiful appearance for a long period of time and does not require maintenance and has high durability. That is, a non-contaminated finished surface having a high durability exceeding 20 years, preferably exceeding 30 years, more preferably exceeding 40 years can be obtained.

  An intermediate coating layer containing a siloxane cross-linked acrylic-silicone polymer with a matting agent in a relatively smaller amount than the top coating layer is applied on the undercoating layer to further form an intermediate coating layer. It is also preferable to do this. In this case, since the undercoating coating layer and the intermediate coating layer, and the intermediate coating layer and the overcoating coating layer are chemically bonded by a siloxane bond, the adhesive layer is firmly adhered and becomes a highly durable coating layer. Further, since the coating film is hydrophilic, it is difficult for dust to adhere to it, and the once adhered dust can be easily washed away with rainwater or the like. As a result, it is possible to obtain a building wall material that maintains a beautiful appearance for a long period of time and does not require maintenance and has high durability. That is, a non-contaminated finished surface having a high durability exceeding 20 years, preferably exceeding 30 years, more preferably exceeding 40 years can be obtained.

  In the following, the undercoat coating layer may be referred to as “clear”, the intermediate coating layer may be referred to as “semi-gloss”, and the topcoat coating layer may be referred to as “matte”. Clear does not contain a matting agent in the coating agent, semi-glossy contains a matting agent of more than 0 and less than 6 parts by weight in 100 parts by weight of the coating agent, and matting exceeds 10 parts by weight in 100 parts by weight of the coating agent. It is preferred to include up to parts by weight of a matting agent.

  The siloxane cross-linked acrylic-silicon polymer contained in the coating agent is preferably an alkoxysilyl group-containing vinyl polymer obtained by polymerizing a monomer represented by the following (Chemical Formula 1) as an essential component.

In the above (Formula 1), R ¹ is a hydrogen atom, a methyl group, a monovalent organic group selected from aryl and aralkyl groups of 7 to 12 carbon atoms having 6 to 25 carbon atoms, R ² is hydrogen or C A monovalent organic group selected from an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 25 carbon atoms and an aralkyl group having 7 to 12 carbon atoms, R ³ is an alkyl group having 1 to ³ carbon atoms, and a is 0 The integer of -2, m shows the integer of 1-10.

As an example, the following monomers may be mentioned, but are not limited thereto.
(1) CH ₂ = CHCOO (CH ₂ ) ₃ Si (OCH ₃ ) _{3
(2) CH 2 = C (} CH 3) COO (CH 2) 3 Si (OCH 3) 3
_{(3) CH 2 = C (} CH 3) COO (CH 2) 3 Si (CH 3) (OCH 3) 2
_{(4) CH 2 = CHCOO (} CH 2) 3 Si (OC 2 H 5) 3
_{(5) CH 2 = CHCOO (} CH 2) 3 Si (CH 3) (OC 2 H 5) 2
_{(6) CH 2 = C (} CH 3) COO (CH 2) 3 Si (OC 2 H 5) 3
_{(7) CH 2 = C (} CH 3) COO (CH 2) 3 Si (CH 3) (OC 2 H 5) 2
The monomer may be one kind or a mixture of two or more kinds.

  Moreover, as a monomer copolymerizable with the said monomer, the alkylester of acrylic acid or methacrylic acid, or another vinyl monomer and amide-type monomer can be used. Specific compounds include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate. , T-butyl acrylate, t-butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, lauryl acrylate, lauryl methacrylate, stearyl acrylate, stearyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, heptyl acrylate, heptyl methacrylate Acid al Ester, styrene, α-methylstyrene, vinyl toluene, vinyl acetate, acrylonitrile, methacrylonitrile, and other vinyl monomers, acrylamide, methacrylamide, methylol acrylamide, methylol methacrylamide, methoxymethyl acrylamide, n-butoxymethyl acrylamide, diacetone acrylamide And amide monomers such as diacetone methacrylamide. These may be used alone or in combination of two or more.

  When these monomers are radically polymerized, the vinyl group is broken and polymerized to form a main chain, and a suitable alkoxysilyl group-containing vinyl polymer can be obtained. The preferred number average molecular weight of this polymer is 3000 to 100,000.

  Since a suitable vinyl polymer has an alkoxysilyl group in the side chain, the reaction proceeds even at room temperature (room temperature) with a catalyst. That is, by a dealcoholization reaction, it reacts with silanol groups or other hydroxyl groups (—OH groups) to form siloxane bonds (—SiO—, Si is tetravalent but divalent is omitted. The same applies hereinafter). The Alternatively, the alkoxysilyl group is hydrolyzed to form a silanol group (—SiOH group), which reacts with silanol groups or another hydroxyl group (—OH group) to form a siloxane bond (—SiO—). This siloxane bond results in a crosslinked structure. Therefore, it is called “siloxane cross-linked type”. Moreover, since the coating film formed in this way is hydrophilic, it is difficult for dust to adhere to it, and the once adhered dust can be easily washed away with rainwater or the like.

  The matting agent contained in the intermediate coating and / or top coating agent is preferably an inorganic powder having an average particle size in the range of 1 to 20 μm. The average particle diameter can be measured with a commercially available particle size distribution meter. For example, it can be measured using a laser diffraction particle size measuring device (LA920) manufactured by Horiba, Ltd., a laser diffraction particle size measuring device (SALD2100) manufactured by Shimadzu. The matting agent can be selected from inorganic powders such as silica, talc, clay and alumina.

  In the method of the present invention, a primer coating agent is applied and cured (formation of a primer coating layer), and a primer coating agent is applied thereon and cured (formation of a primer coating layer). Preferably, an intermediate coating agent is applied between the undercoat coating layer and the topcoat coating layer and cured (formation of the intermediate coating layer). A catalyst, a solvent, and other additives can be added to the undercoat, intermediate coat, and topcoat coating agents together with the siloxane crosslinked acrylic-silicon polymer. As the catalyst, an acid, a base, or an organic metal can be used. Of these, organic tin is preferable. Examples of the organic tin include dioctyltin bis (2-ethylhexyl maleate), dioctyltin oxide or a condensate of dibutyltin oxide and silicate, dibutyltin dioctate, dibutyltin dilaurate. Dibutyltin distearate, dibutyltin diacetylacetonate, dibutyltin bis (ethyl maleate), dibutyltin bis (butyl maleate), dibutyltin bis (2-ethylhexyl maleate), dibutyltin bis (oleyl maleate) -T), stannous octoate, tin stearate, di-n-butyltin rallate oxide and the like. Examples of tin compounds having an S atom in the molecule include dibutyltin bisisononyl-3-mercaptopropionate, dioctyltin bisisononyl-3-mercaptopropionate, octylbutyltin bisisononyl-3-mercaptopropionate. , Dibutyltin bisisooctylthiogluconate, dioctyltin bisisooctylthiogluconate, octylbutyltin bisisooctylthiogluconate, and the like. The catalyst may be used alone or in combination of two or more. When using organic tin, the amount of the catalyst used is preferably 0.01 parts by weight or more and 1 part by weight or less, more preferably 0.1 parts by weight with respect to 100 parts by weight of the siloxane crosslinked acrylic-silicon polymer component. It is not less than 0.2 parts by weight.

  Examples of the solvent include hydrocarbons such as toluene, xylene, n-hexane and cyclohexane; acetates such as ethyl acetate and butyl acetate; alcohols such as methanol, ethanol, isopropanol and n-butanol; ethyl cellosolve and butyl cellosolve. And ethers such as cellosolve acetate; ketones such as methyl ethyl ketone, ethyl acetoacetate, acetylacetone, diacetone alcohol, methyl isobutyl ketone, and acetone. Among these solvents, a particularly preferable solvent is xylene from the viewpoint of safety. The solvent is used in an amount of 50 to 200 parts by weight, preferably 70 to 150 parts by weight, more preferably 80 to 120 parts by weight, based on 100 parts by weight of the siloxane-crosslinked acrylic-silicon polymer component. Or less.

  Examples of the additive include antifoaming agents such as silicone oil, ultraviolet absorbers such as hindered phenol, anti-sagging agents such as light stabilizers and amide wax, and leveling agents.

  In the method of the present invention, it is preferable to apply the intermediate coating agent twice in order to further increase the durability.

  Hereinafter, the top coat will be described in more detail using examples. Note that the present invention is not limited to the following examples.

(Measurement test method for each characteristic)
(1) Accelerated test using sunshine weather meter Tester: Suga Test Instruments Co., Ltd., model number “WE-SUN-HC-DC”
Light source: 1 lamp type, cerium-containing cored carbon is combined 4 each on the top and bottom Light wavelength: 280-400 nm
Irradiance: 255 ± 45 W / m ² with filter, 285 ± 50 W / m ² without filter
Optical filter: Heat-resistant optical glass plate used. 1 set of 8 cuts short wavelength components of 255 nm or less, transmits 10 to 50% of components up to 355 nm. Emission power: 50 V, 60 A (3000 W)
Atmospheric temperature: 63 ± 3 ° C
Shower: Precipitation operation for 18 minutes in 120 minutes Spray water volume: 2100 ± 100 ml / min (pH 6.0-8.0, water temperature 16 ± 5 ° C.) Number of samples: 70 × 150 mm, 76 sheets Operation cycle: 60 hours
(2) Gloss It observed visually and evaluated as follows.

A: Gloss similar to natural stone B: Slightly noticeable gloss (3) Presence or absence of cracks The surface of the sample after the accelerated test using a sunshine weather meter was visually observed and evaluated as follows.

A: No crack B: Slightly cracked, repair required C: Large crack, repair required (4) Discoloration The surface of the sample after the accelerated test with a sunshine weather meter was visually observed and evaluated as follows.

A: No discoloration B: Discolored but inconspicuous to the extent that there is no practical problem, no repair required C: Some noticeable discoloration, repair required D: Clearly discolored, repair required (Example 1)
An undercoat coating agent and an overcoat coating agent were sequentially applied to the surface of the spray-coated surface using a spray nozzle for the coating agent.
(1) Undercoat coating agent (clear)
Hama Top FC Clear (base)
Alkoxysilyl group-containing vinyl polymer (number average molecular weight 15000) 43 parts by weight Additive (antifoaming agent + light stabilizer + pigment dispersant) 1 part by weight Solvent (ethyl acetate) 2 parts by weight Solvent (butyl acetate) 2 parts by weight Solvent (xylene) 45 parts by weight Base 93 parts in total Hama Top FC Clear (curing agent)
1 part by weight of organic tin (dibutyltin dilaurate) (0.1 parts by weight of organic tin)
Solvent (xylene) 6 parts by weight Curing agent Total 7 parts by weight Total 100 parts by weight Application amount 100 g / m ² (50 g / m ^{2 in} dry weight (solid content)) 1 time coating (2) Top coating agent (matte)
Hama Top FC matte clear (base)
Alkoxysilyl group-containing vinyl polymer (number average molecular weight 15000) 40 parts by weight Additive (antifoaming agent + light stabilizer + pigment dispersant) 1 part by weight Solvent (ethyl acetate) 2 parts by weight Solvent (butyl acetate) 2 parts by weight Solvent (xylene) 41 parts by weight Matting agent (silica with an average particle diameter of 8 μm) 7 parts by weight Base Total 93 parts by weight Hamatop FC matting clear (curing agent)
2 parts by weight of a mixture of organic tin (dibutyltin dilaurate) (0.2 parts by weight of organic tin)
Solvent (xylene) 5 parts by weight Curing agent Total 7 parts by weight Total 100 parts by weight Application amount 100 g / m ² (dry weight (solid content) 50 g / m ² ) applied once Wall surface for building with beautiful exterior finish When the material was subjected to an accelerated test using a sunshine weather meter, it was confirmed that the material was durable without cracks, cracks and discoloration even after 8000 hours (equivalent to 40 years).

(Example 2)
In Example 1, spray coating was applied in the same manner as in Example 1 except that the base coating agent was applied once and cured, and the intermediate coating agent was applied twice thereon.
(3) Intermediate coating agent (half gloss)
Hama Top FC semi-gloss clear (base)
Alkoxysilyl group-containing vinyl polymer (number average molecular weight 15000) 41 parts by weight Additive (antifoaming agent + light stabilizer + pigment dispersant) 1 part by weight Solvent (ethyl acetate) 2 parts by weight Solvent (butyl acetate) 2 parts by weight Solvent (xylene) 42 parts by weight Matting agent (silica with an average particle size of 8 μm) 5 parts by weight Base Total 93 parts by weight Hamatop FC semi-gloss clear (curing agent)
2 parts by weight of a mixture of organic tin (dibutyltin dilaurate) (0.2 parts by weight of organic tin)
Solvent (xylene) 5 parts by weight Curing agent Total 7 parts by weight Total 100 parts by weight Application amount 100 g / m ² (50 g / m ^{2 in} dry weight (solid content)) 2 times coating When the material was subjected to an accelerated test using a sunshine weather meter, it was confirmed that the material had no cracks, cracks and discoloration until 7000 hours (equivalent to 35 years).

Example 3
In Example 1, spray coating was applied in the same manner as in Example 1 except that the base coating agent was applied once and cured, and the intermediate coating agent was applied once thereon.

  When the acceleration test using a sunshine weather meter was performed on the wall material for a building with a beautiful finish, it was durable up to 7000 hours (equivalent to 35 years) without cracks, cracks and discoloration. I was able to confirm.

Example 4
In Example 1, spray coating was performed in the same manner as in Example 1 except that the undercoat coating agent was not applied.

  When an accelerated test using a sunshine weather meter was performed on the wall material for a beautifully finished building, it was durable and free of cracks, cracks, and discoloration up to 4000 hours (equivalent to 20 years). I was able to confirm.

(Example 5)
In Example 2, spray coating was performed in the same manner as in Example 2 except that the undercoat coating agent was not applied.

  When an accelerated test using a sunshine weather meter was performed on the wall material for a beautifully finished building, it was durable and free of cracks, cracks, and discoloration up to 4000 hours (equivalent to 20 years). I was able to confirm.

(Example 6)
In Example 2, spray coating was applied in the same manner as in Example 2 except that the undercoat and intermediate coat coating agents were not applied and the top coat coating agent was applied twice.

  When an accelerated test using a sunshine weather meter was performed on the wall material for a building with a beautiful finish, it was durable without cracks, cracks, and discoloration up to 2000 hours (equivalent to 10 years). I was able to confirm.

  The above results are summarized in the following (Table 1).

  As is clear from the above (Table 1), in Examples 1 to 3, since a coating containing a siloxane cross-linked acrylic-silicon polymer without adding a matting agent as an undercoat coating agent was applied, the durability is high. . Further, since a semi-glossy or matte layer was formed on the outermost layer, it had a calm luster similar to natural stone.

  In Examples 4 to 6, since a semi-glossy or matte layer was formed directly on the spray layer, there was a tendency that durability was somewhat low and gloss was too strong.

  INDUSTRIAL APPLICATION Since this invention can obtain the wall surface of the building which consists of the wall material for buildings which has the same texture and aesthetics as the actual limestone which exists in nature, it is useful with respect to the finishing of the outer wall surface of a building. .

Horizontal section process drawing which shows the spray coating method of the building in one embodiment of the present invention The flowchart which shows the spray coating method of the building in one embodiment of this invention The top view which shows the wall material for buildings obtained using the spray coating method of the building in one embodiment of this invention The perspective view which shows the 3 head type spray gun used in order to spray the spraying material for spray coating surface formation in the spray coating method of the building in one embodiment of this invention The schematic block diagram which shows the apparatus used in order to spray the spraying material sprayed sparsely to the spray coating surface in the spray coating method of the building in one embodiment of this invention, respectively

1, 2, 3 Tank 4, 5, 6 Jet nozzle 7 First spray material 8 Second spray material 9 Third spray material 10 Joint rod 11 Spray gun 12 Device 13 Hopper 14 Conduit 15 Coating nozzle 16 Switching valve 17 , 18 Flow path 19 Shut-off valve 20, 21 Compressed air supply path 22 Wall surface of the building (frame)
23 Resin mortar 24 Streaked pattern 25 Joint

Claims (13)

A step of spraying a spray material of a predetermined color including aggregate and synthetic resin on the wall surface of the building to form a spray-painted surface;
A step of sparsely spraying a plurality of types of spraying materials different in color from the spraying material of the predetermined color, including aggregate and synthetic resin on the sprayed coating surface;
By moving the spray material of the predetermined color and the plurality of types of spray material along one direction in the surface of the spray coating surface, the spray coating surface of the spray coating surface on which the plurality of types of spray material are sprayed sparsely. A method of spray painting a building with a surface leveling process.   The spray coating method for buildings according to claim 1, wherein the spray material of the predetermined color is sprayed using a spray gun having a small diameter and a high spray pressure. The spray coating method for a building according to claim ² , wherein the spray gun has a diameter of 5 to 8 mm and a spray pressure of 5 to 7 kg / cm2. It said plurality of kinds of spraying material equivalent spherical diameter of 2 to 3 mm, spraying density of 500 to 12,000 pieces / m ^2, spray coating method of building according to claim 1.   The spray coating method of the building in any one of Claims 1-4 which uses a light color spray material as the said predetermined color spray material.   The architectural spray coating method according to claim 5, wherein the light color is a light beige color.   The spray coating method for buildings according to claim 6, wherein a red spray material and a white spray material are used as the plurality of types of spray materials.   The method of spray painting a building according to any one of claims 1 to 7, further comprising a step of polishing the surface of the leveled spray coating surface.   The building spray coating method according to claim 1, wherein a spray material including 5 to 90 parts by weight of aggregate and 10 to 95 parts by weight of synthetic resin is used as each spray material.   The spray coating method for a building according to any one of claims 1 to 9, wherein at least one selected from the group consisting of ceramic aggregate, natural stone aggregate, and baked aggregate is used as the aggregate.   The architectural spray coating method according to claim 1, wherein an acrylic resin emulsion is used as the synthetic resin.   The method of spray coating a building according to any one of claims 1 to 11, wherein a top coat is applied to the surface of the leveled spray coating surface with a transparent resin.   The method of spray painting a building according to claim 12, wherein an acrylic-silicon paint or a fluorine paint is used as the transparent resin.

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