JP2007204691A - New composition for coating building material requiring no undercoating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a so-called white mortar-based composition for coating building materials, comprising slaked lime and white cement as main components, requiring no undercoating, excellent in adhesiveness with the building material (base) to be coated, generating no cracks and floatings and excellent in appearance and touch feeling. <P>SOLUTION: The composition is prepared by blending a suitable amount of an ethylene-vinyl acetate-based copolymer resin or an ethylene-vinyl chloride copolymer resin and a cation acrylic resin in addition to cement or white cement, slaked lime and an aggregate material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a building material coating composition for coating wall materials, ceiling materials and the like. More specifically, a new composition for painting building materials that does not require undercoating for painting boards, panels, outer wall materials, inner wall materials, ceiling materials made of wood, plywood, concrete, mortar, metal, ceramics, tiles, etc. About.

Conventionally, various materials such as wood, concrete, metal, ceramics, bricks, boards, panels, tiles, etc. have been used as outer wall materials, inner wall materials, and ceiling materials of buildings, depending on their intended use. These materials are properly used. The same applies to civil engineering structural materials, and various materials such as iron, aluminum, concrete, wood, brick, and stone are used.
These outer wall materials, inner wall materials, ceiling materials, civil engineering structural materials, etc., are used to protect the materials from climatic environments such as rain and direct sunlight, to prevent damage, or for decoration purposes, such as paint, mortar, plaster, etc. It is usually painted with.
By the way, when painting with these paints, mortar, plaster, etc., undercoating work was indispensable. The purpose of the primer coating material is
Reinforces the fragile substrate and forms a strong substrate, improves the adhesion of the finish coating material and improves the durability,
It is said to eliminate the uneven suction of the substrate and finish it on a beautiful painted surface, eliminate the unevenness of the substrate, pinholes, hair cracks, etc., and finish it on a beautiful painted surface.
Therefore, in undercoating, it is said that the effectiveness of the paint should be fully understood, the suitability of the topcoat should be carefully examined, and a primer suitable for the paint should be used.
However, these undercoating operations required not only a large amount of undercoating, but also a great deal of labor and construction time. If these undercoating treatments are neglected, the top coat will peel off, cracks and floats will not be achieved, and the original purpose of the paint will not be achieved. .

By the way, as described above, the outer wall material, the inner wall material, the ceiling material, the civil engineering structure material, and the like of the house are usually painted with paint, mortar, plaster, or the like. Of these, plaster originally meant lime and slaked lime applied as the surface finish of the earth wall, but in recent years it has been called plaster including white cement coating.
This white cement-based coating material can be adjusted to various colors by mixing not only the original white color, but also color powder, has excellent durability and weather resistance, and is not affected by water. It is also possible to paint with a pattern, and in addition, it has the advantage that it is more durable than plaster and can be painted on it, so it can be used for interior and exterior walls of buildings, decorative products, concrete products, interior tile joint mortar And so on. In addition, the texture is rougher than Jolipad, so it is warm and expresses a natural feeling, and it is also very popular because it matches Western style houses. Therefore, recently, white cement coating is widely used instead of plaster.

Under such a background, various studies have been made on white cement-based coating materials, and the following inventions and techniques have been reported. For example, the improvement technique regarding inorganic compounding agents such as titanium oxide is as follows.

Japanese Patent Application Laid-Open No. 2003-138690 describes an invention of a concrete panel wall as described below that prevents titanium oxide from peeling off.
“Concrete mainly panel walls used as outer and inner walls of buildings, characterized by being formed by kneading at least cement or white cement, aggregate, water, alkali-resistant glass fiber and titanium oxide. Panel wall ”(see Patent Document 1)

Japanese Patent Application Laid-Open No. 11-12066 provides a building material composition that can be constructed by brush, painting roller, or spraying when creating a board, panel, wall or the like having a surface layer having a high dew condensation prevention effect based on humidity control. The following inventions for the purpose are described.
“In a composition for building materials containing powdered slaked lime, white cement, and powdered baked white diatomaceous earth, 80 to 90 parts by weight of the white cement and 50 to 50% of the powdered baked white diatomaceous earth with respect to 100 parts by weight of the powdered slaked lime. 60 parts by weight, 11 to 67 parts by weight of powdered clay raw material, and a small amount of powdered acrylic resin, metroise, and defoaming agent as auxiliary materials. Composition ”(see Patent Document 2)

Japanese Patent Laid-Open No. 2002-155612 facilitates the decomposition and construction of harmful chemical substances such as formaldehyde, which is a cause of life odor and sick house syndrome, by adopting an improved titanium oxide having a photocatalytic function in white shirasu. The invention relating to the finishing material as described below is described.
White shirasu 55-75%, slaked lime 15-40%, plaster 15-40%, white cement 15-40%, binder, reinforcing material vinylon chip 0.1-3%, improved titanium oxide for photocatalyst, 0.2 A finishing material characterized in that the composition is -5%, Metrose 0.001 to 0.01%, and inorganic pigment 0.1 to 5%. (See Patent Document 3)

Japanese Patent Application Laid-Open No. 2003-183088 relates to an invention relating to a decorative material for concrete as described below, which can shorten the construction period for makeup of a concrete frame and can reduce its cost, and a makeup method using the same. It is described.
“Concrete decorative material containing at least white cement, titanium oxide, powdered serpentine, and pigment” (see Patent Document 4)

In addition, various inventions have been reported for improving techniques for building material coating compositions containing white cement modified with a polymer, as described below.

Japanese Patent Application Laid-Open No. 2004-131345 discloses an architectural composition as described below which is less likely to be cracked, peeled off, floated or the like even when constructed on walls, floors, ceilings, etc., and an invention relating to a wall structure and a floor structure using the composition. Is described.
“One or two or more of cement powder and white cement powder, No. 4 to No. 9 cinnabar sand and river sand, one or more inorganic fibers having a length of 3 to 15 mm, and an ethylene vinyl acetate copolymer A building composition characterized in that a resin powder curing agent is packaged in a container "(see Patent Document 5)

In Japanese Patent Laid-Open No. 11-324337, an existing steel reinforced concrete or steel reinforced concrete column or beam is provided with a steel plate for seismic reinforcement from the outside, and this steel plate is pressed from the outside with a steel material to be anchored. An invention relating to the seismic reinforcement construction method characterized in that there is a reinforced concrete wall on the frame surface, and a steel plate for seismic reinforcement is superposed on the reinforced concrete wall surface and a filler is injected into the gap. Is described.
As the filler, there is a description that a polymer cement-based material prepared by blending a composite polymer emulsion composed of an emulsion composed of white cement, silica sand and additives and a polyacrylic acid polymer cement mortar is described.
Since the present invention does not unnecessarily dismantle the existing building and only requires reinforcement work from the outside, the work can be carried out while the inside of the building remains as it is, and the reinforcement that does not make it bulky can be easily and inexpensively applied. It is intended to be able to do.
The purpose of injecting the filler is to make the filler a polymer cement-based material prepared by compounding a composite polymer emulsion consisting of an emulsion consisting of white cement, silica sand and additives and a polyacrylic acid polymer cement mortar, This is because fire resistance can be increased and fire resistant can be achieved. (See Patent Document 6)

Japanese Patent Application Laid-Open No. 7-119262 reports an invention relating to a waterproof material comprising cement, cinnabar, cationic acrylic resin emulsion, methyl cellulose, and an antifoaming agent.
According to the publication, “Acrylic resin is the strongest to ultraviolet rays compared to other synthetic resins, has a semi-permanent life even on rooftops that are exposed to strong sunlight, and acrylic resin is elastic, even if the underlying concrete is Even if cracking occurs, the waterproof layer on the surface does not stretch and break, so the polymer cement mortar made of this cement and cationic acrylic resin emulsion is an ideal waterproof material in terms of performance and durability. " Says. (See Patent Document 7)

Japanese Patent Laid-Open No. 7-10627 discloses the following paints as elastic paints suitable for heat shielding, heat resistance, waterproofing and UV protection for surfaces such as slate roofs, tin roofs, rubber sheets, asphalt rooftops, waterproof protective surfaces, storage tanks and the like. It reports on.
"White cement 30-60% by weight, titanium oxide 3-10%, silica balloon 10-20%, mica 1-5%, non-chlorine water-soluble polymer 0.1-1% and aggregate 10-30 % Base coat and white cement 30-60%, titanium oxide 3-10%, mica 1-5%, glass pieces 5-30%, UV-cutting agent 0.5-2%, pigment 0.1 1% or less thickener, setting retarder, antifoaming agent in each of the main coating materials containing ˜2%, non-chlorine water-soluble polymer 0.1-1% and bone 10-30% A cement composite type heat reflecting paint characterized in that an admixture and fresh water are further mixed at a predetermined ratio to each main material to which a dispersant is appropriately added to form an undercoat material and an overcoat material.
In addition, in the same document, for each of these main materials, an undercoating material and a top coating material are further mixed as an admixture with a water-soluble emulsion resin such as a cationic acrylic elastic resin and fresh water at a predetermined ratio. It is also described that it may be obtained. (See Patent Document 8)

Japanese Patent Application Laid-Open No. 2003-172009 thickens a cement-based base adjustment coating material on the surface of a base wall material that has been subjected to curing and pretreatment, and the surface is designed until the base adjustment coating material is cured. An undercoating step for forming undulations, and after the base adjustment coating material is cured, a first ceramic coating material in which a colored aggregate made of natural stone or ceramics is mixed in a synthetic resin emulsion is applied to the entire surface of the base adjustment coating material. The invention relates to a wall covering method that has a deep texture and color sensation characterized by comprising an intermediate coating step applied to the surface, and that can freely express shades and color changes according to the surface undulations and patterns Has been. Examples of the cement-based foundation adjustment coating material include a foundation adjustment coating material made of a cement-based elastic cation obtained by blending Portland cement and an inorganic aggregate with a hardening liquid composed of a cationic acrylic synthetic resin emulsion. (See Patent Document 9)

However, the above-mentioned white cement-based coating composition is no exception, and the undercoat treatment is indispensable as in the case of painting with paint, mortar, plaster or the like.
JP 2003-138690 A JP-A-11-12066 JP 2002-155612 A JP 2003-183088 A JP 2004-131345 A JP-A-11-324337 Japanese Patent Laid-Open No. 7-119262 Japanese Patent Laid-Open No. 7-10627 JP 2003-172009 A

The white cement-based coating composition (also called white mortar or Western-style plaster) mainly composed of white cement and slaked lime can be applied with its beauty and color tone, and with a trowel pattern. In addition, it has the advantage that it is more durable than plaster and can be overcoated on top of it, and further matches with Western-style houses, so its popularity is increasing and it is becoming widespread. Research on compounding agents for these white mortars has also been actively conducted.
However, these white cement-based coating compositions are no exception, and in many cases undercoating is indispensable, as in the case of painting with paint, mortar, plaster, etc. It caused peeling of paint and cracks. In addition, a large amount of primer was required for the primer work, and a lot of days were required for the construction.
Accordingly, an object of the present invention is to provide a mortar containing slaked lime that does not require an undercoating operation, is excellent in adhesiveness with a building material to be coated, does not cause cracks or floats, and has excellent appearance and touch. It is preferable to provide a white cement-based coating composition.

As a result of diligent research on a mortar-based coating composition containing slaked lime, particularly a white cement-based coating composition, the inventor has surprisingly found that a conventional mortar mainly composed of cement or white cement, slaked lime and aggregate is used. By blending an ethylene vinyl acetate copolymer resin or ethylene vinyl chloride copolymer resin and a cationic acrylic resin into a coating composition, especially a white cement-based coating composition, an undercoating operation is not necessary and should be applied. The present invention was completed by finding that sufficient adhesion to building materials was ensured and cracks and floats did not occur.

That is, the present invention is as follows.
1. A building material coating composition comprising cement or white cement, slaked lime, aggregate, ethylene-vinyl acetate copolymer resin or ethylene-vinyl chloride copolymer resin, and a cationic acrylic resin.
2. In the above 1, wherein the ethylene-vinyl acetate copolymer resin is an ethylene-vinyl acetate copolymer, an ethylene-vinyl acetate-vinyl chloride copolymer, an ethylene-vinyl acetate-acrylic ester copolymer, or a mixture thereof. The composition for building material coating as described.
3. 0.1 to 2 kg of reinforcing fiber, 0.2 to 10 kg of ethylene-vinyl acetate copolymer resin or ethylene-vinyl chloride copolymer, and 0 of cationic acrylic resin to 25 kg of solid content mixture for mortar The building material coating composition as described in 1 above, comprising 1 to 5 kg.
4). A building material coated with a building material coating composition selected from 1 to 3 above.

Since the composition for painting a building material of the present invention has excellent adhesion to a base made of metal, ceramic, wood, concrete, etc., it is not necessary to perform the undercoating which has been conventionally required. Moreover, the building material coated with the coating composition according to the present invention does not peel off from the building material even though it has not been subjected to a primer treatment, and does not crack or float, but also looks and feels. It is also excellent from the point of view. Therefore, since no undercoating material is required, the work process can be remarkably simplified, the work efficiency can be improved, the labor can be saved, the cost can be reduced, and the construction period can be greatly shortened.

The materials used in the present invention are as follows.

“Slaked lime” is used as a raw material for cement, plaster, plaster and the like, and is a white powder obtained by baking lime and reacting with water. Commercial slaked lime can be used as the slaked lime as a compounding agent.

“Cement or white cement” means ordinary Portland cement or white cement, and white cement is preferable from the viewpoint of white mortar or Western-style plaster. The compounding quantity of the slaked lime with respect to a cement or white cement is 80-500 weight part with respect to 100 weight part of cement or white cement, Preferably it is 100-300 weight part, More preferably, it is 100-170 weight part.

"White cement" is a Hunter whiteness (100 on a scale from 0 to 100) that is whitened by reducing ferric oxide (Fe2O3) and magnesium oxide (MgO), which are the color components of general Portland cement. (Pure white) is a substantially pure white cement having a grade of about 93, has a function as a hardener, and has basically the same properties as ordinary Portland cement.

“Mortar” means a mixture of slaked lime, cement or white cement, sand as an aggregate, and the like with an appropriate amount of water. “White mortar” means mortar using white cement as a cement component. A solid mixture for mortar (white) formed by mixing aggregates such as (white) cement, slaked lime, sand, etc., which is necessary for making mortar, excluding water, is also commercially available. You may add and use water for such a commercial item.
That is, the “solid mixture for mortar” means a mixture made of cement or white cement, slaked lime, and sand as an aggregate. You may mix | blend quartz aggregate and an inorganic pigment as needed.
The (white) mortar can be easily obtained by adding 7 to 15 L, preferably 8 to 12 L, particularly preferably 10 L of water and mixing and stirring with respect to 25 kg of the dry solid content mixture. A preferred commercial product as a white mortar solid mixture is “Trdital” (trade name) sold by PRB, France.

“Aggregate” means (white) cement, sand or gravel mixed with water to make mortar or the like, especially sand. Specifically, “aggregate” is sand, light sand, pulverized coal ash, silica sand, and may be powdered serpentine. Silica sand is white sand mainly composed of quartz and is also known as a raw material for producing glass and ceramics. Aggregates can be classified into fine aggregates and coarse aggregates according to the size of the grains. The fine aggregate means an aggregate having 85% or more of particles having a size of 5 mm or less, and sand is preferable. The blending amount of the aggregate varies depending on the purpose of use, but is generally 1 to 5 times, preferably 2 to 4 times the weight of (white) cement 1.

“Reinforcing fiber” is widely used as a reinforcing material for wall materials. For example, in plaster, fiber such as sasa, hemp, and paper sasa is called “susa” for the purpose of preventing cracks. It's being used. The reinforcing fiber is not necessarily an essential compounding agent in the present invention. However, from the viewpoint of improving the strength, a building material coating composition containing reinforcing fibers is preferable.
The preferred reinforcing fibers used in the present invention are natural organic fibers such as straw, hemp and paper used since ancient times, and synthetic fibers typified by nylon fibers such as Amilan Tuff Binder (product of Toray Industries, Inc.). Inorganic fibers such as carbon fibers (carbon fibers) and glass fibers.
Particularly preferred are inorganic fibers, particularly glass fibers, from the viewpoint of strength and fire resistance, and more preferred are alkali resistant glass fibers. Alkali-resistant glass fibers can be stronger than ordinary concrete products without being affected by the alkali components contained in the cement. Regarding the length, the reinforcing fibers having a length of 2 mm to 10 mm, preferably 20 mm to 80 mm are 80% or more. Moreover, the compounding quantity of the reinforcing fiber is based on 25 kg of the (white) mortar solid content mixture (the dry solid content mixture before adding water to the (white) mortar) that is the raw material of the (white) mortar. 0.1 to 2 kg, preferably 0.3 to 1.5 kg.
By blending reinforcing fibers, not only the strength is improved, but also cracks can be effectively prevented.

“Ethylene vinyl acetate copolymer resin” means a copolymer resin obtained by copolymerizing at least ethylene and vinyl acetate. Specifically, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate- It means a vinyl chloride copolymer or an ethylene-vinyl acetate-acrylic ester copolymer. Particularly preferred is an ethylene-vinyl acetate-vinyl chloride copolymer. The preferred form of these copolymer resins is an emulsion. These copolymer resins are commercially available and known. Preferred commercially available products include BIG SUN from Daiichi Kasei Co., Ltd., Sumikaflex (registered trademark) from Sumika Chemtech Co., Ltd., and copolymer resins sold as U primers from Ube Industries, Ltd. be able to. Particularly preferred is “Big Suncoat SC-100” manufactured by Dainippon Kasei Co., Ltd., and preferred Sumikaflex is, specifically, an ethylene-vinyl acetate copolymer emulsion, an ethylene-vinyl acetate-vinyl chloride copolymer. An emulsion, an ethylene-vinyl acetate-acrylic ester copolymer emulsion, and an ethylene-vinyl acetate-special vinyl ester emulsion. The U primer is a mortar plaster material made of an ethylene vinyl acetate resin emulsion. The preferred blending amount of the ethylene vinyl acetate copolymer resin is 0.2 to 10 kg / 25 kg, preferably 0.3 to 6 kg / 25 kg, more preferably 0.3 to 3 kg with respect to the mortar solid content mixture. / 25Kg.

“Ethylene-vinyl chloride copolymer resin” means a copolymer resin obtained by copolymerizing at least ethylene and vinyl chloride, and a preferred form is an emulsion. These copolymers for resins are commercially available and known. Preferable examples of commercially available products include ethylene-vinyl chloride copolymer emulsion resins sold as Sumielite (registered trademark) manufactured by Sumika Chemtech.

The trade name Sumikaflex (registered trademark) ethylene-vinyl acetate copolymer and the trade name Sumielite (registered trademark) ethylene-vinyl chloride copolymer are both adhesives for civil engineering and construction (mixed with cement). Agent, cement-based waterproofing agent, vegetation), paper / fiber adhesive (nonwoven fabric, impregnated paper binder, carpet backing). Sumikaflex not only has excellent adhesiveness, but also has excellent flexibility and toughness, in particular, excellent alkali resistance, weather resistance, and durability. In addition, smearite not only has excellent adhesiveness, but also has water resistance, gas barrier properties, solvent resistance, durability and alkali resistance, and is excellent in self-extinguishing properties.

The “cationic acrylic resin” is a resin known as a mortar adhesive, a waterproof enhancer, a surface coating material, a mortar plaster material, a base treatment resin, and the like, and is commercially available. For example, Toa Gosei Co., Ltd. sells it as “Aronkathiokreet” as a substrate conditioner. The purpose of blending is to improve appearance and feel. A preferable blending amount of the cationic acrylic resin is 0.1 to 5 kg / 25 kg, preferably 0.2 to 4 kg / 25 kg, more preferably 0.5 to 1.5 kg / 25 kg relative to the mortar solid content mixture. It is.

In addition, you may mix | blend compounding agents, such as a pigment, a titanium oxide, a baking white diatomaceous earth, as needed. The calcined white diatomaceous earth has a porous structure and has excellent anti-condensation action. When the humidity in the building space is high, it absorbs moisture into the porous structure, and when the humidity in the building space is low, the porous structure It releases moisture from the inside to the space and plays a role in providing optimum humidity. These compounding agents such as titanium oxide and calcined white diatomaceous earth are 2 to 60% by weight, preferably 5 to 20% by weight, particularly preferably 5 to 10% by weight based on 100 parts by weight of powdered slaked lime.

Since the coating composition of the present invention has excellent adhesion to various materials to be coated, so-called base materials, the building material (base) to which the coating composition of the present invention is applied is particularly limited. Rather than, for example, ALC, silica light board, PC board, flexible board, polystyrene foam, concrete block, resin block, brick, iron, stainless steel, aluminum, copper plate, tile, ceramic, glass, FRP, asphalt, rubber, siding Examples include board, concrete, lath mortar, lath cut board, gypsum board, panel, veneer, wood, tile carpet, carpet, cloth and paper.
The term “building material” in the present invention means the above-mentioned material to be a so-called base, and includes various materials used for civil engineering and other materials, and is not particularly limited. Absent.

The adjustment method of the composition for building material coating of the present invention is as follows. However, the present invention is not limited to this, and the blending ratio and blending order may be changed as appropriate according to the base material and the purpose of coating.
First, white mortar is prepared according to a normal method, and an appropriate amount of ethylene-vinyl acetate copolymer resin emulsion or ethylene-vinyl chloride copolymer resin emulsion, and a cationic acrylic resin emulsion are blended into the desired building material coating. The composition for use can be obtained.

1. Adjust the white mortar;
White mortar is obtained by adding slaked lime, white cement, sand as an aggregate and an appropriate amount of water. The blending ratio is 20 to 120 parts by weight, preferably 30 to 90 parts by weight, and more preferably 60 to 90 parts by weight with respect to 100 parts by weight of slaked lime.
Sand or the like as aggregate is 1 to 5 times, preferably 2 to 4 times that of white cement, and a ratio of 100 parts by weight of slaked lime, ordinary cement can also be used.
If the amount of water is too small, it will be difficult to apply the coating composition to the coating surface. Conversely, if the amount of water is too large, it will cause dripping, so application methods such as brush coating, roller coating, spray coating, etc. Alternatively, it may be appropriately adjusted according to the base material to be applied. Preferably, the amount of water to be added is 0.2 to 1 times by weight, more preferably 0.3 to 0 to 0 times by weight with respect to the mortar solid mixture composed of slaked lime, white cement and aggregate. 8 times the weight.
At this time, desirably reinforcing fibers, preferably glass fibers, more preferably alkali-resistant glass fibers are blended. The purpose of blending is to increase strength and prevent cracking. The blending ratio is 0.1 to 2 kg, preferably 0.3 to 1.5 kg, based on 25 kg of the solid content mixture for mortar.
The white mortar can be obtained by adding an appropriate amount of water to a commercially available solid mixture for white mortar, for example, “Trdital (trade name)”, instead of blending as described above.

2. Compounding of Resin Next, an appropriate amount of an ethylene-vinyl acetate copolymer resin emulsion or an ethylene-vinyl chloride copolymer resin emulsion and a cationic acrylic resin emulsion are blended with the white mortar obtained above.
Suitable ethylene-vinyl acetate copolymer resins, ethylene-vinyl chloride copolymer resins, and cationic acrylic resins are as described above. “Big Sun Coat SC-100” manufactured by Daiichi Kasei Co., Ltd. is suitable as an ethylene-vinyl acetate copolymer resin. Also suitable as a cationic acrylic resin is a cationic acrylic resin sold as “Aronkathiocleat”.
A suitable blending amount of the ethylene-vinyl acetate copolymer resin is 0.2 to 10 kg / 25 Kg, preferably 0.3 to 6 kg / 25 Kg, more preferably 0.1 to the mortar solid content mixture. 3 to 3 kg / 25 kg. This is because if it is 0.2 kg / 25 kg or less, the adhesiveness with the building material to be applied is insufficient, and there is a problem of peeling or floating. Further, at 10 kg / 25 kg or more, not only the effect is not exhibited, but the original characteristics of the white mortar are diluted, and the original effect of the white mortar is not exhibited.
Moreover, the suitable compounding quantity of a cationic acrylic resin is 0.1-5 kg / 25Kg with respect to the said solid content mixture for mortars, Preferably it is 0.2-4 kg / 25Kg, More preferably, 0.5-1. 5 kg / 25 kg. This is because when it is 0.1 kg / 25 kg or less, it looks good and the tactile effect is insufficient. Further, at 5 kg / 25 Kg or more, not only the effects are not exhibited, but the original characteristics of the white mortar are diluted, and the original effects of the white mortar are not exhibited.

The method for applying the building material coating composition of the present invention can be carried out in the same manner as a normal application method, and is not particularly limited. It can be applied on various building materials such as walls and ceilings with a plastering iron, sprayed with a spray gun, or applied with a roller, sponge, brush or the like.

As a solid content mixture for white mortar, 25 kg of “Trdital (trade name)” sold by PRB of France was used. “Trdital” is a powder mixture containing white cement, slaked lime, sand and quartz aggregate. 10 L of water was added to the powder mixture and stirred to obtain white mortar.
Next, for this white mortar, 1 kg of an ethylene-vinyl acetate-vinyl chloride copolymer emulsion sold as “BIG SUN” by Dainippon Kasei Co., Ltd. A composition for coating building materials was obtained by blending 750 g of cationic acrylic resin sold under the trade name “Cachiocrete” and 50 g of glass fiber and stirring until uniform.
The obtained building material coating composition was applied to a bath tile having a side of 10 cm with a trowel so as to have a thickness of 2 mm. The paint film applied to the tiles is excellent in appearance and touch, and even if it is left for 3 months in direct sunlight or hit with a hammer, the paint film does not peel off. Neither floating nor deterioration was observed.

Since the building material coating composition of the present invention has excellent adhesiveness to metals, ceramics, wood, concrete, etc., it is unnecessary to perform the undercoating work which has been conventionally required. Moreover, the building material coated with the coating composition according to the present invention is not peeled off from the building material even though it has not been subjected to a primer treatment, and it does not crack or float, but also looks and feels. It is also excellent from the point of view. Therefore, since no undercoating material is required, the work process can be remarkably simplified, the work efficiency can be improved, the labor can be saved, the cost can be reduced, and the construction period can be greatly shortened.
Therefore, conventional coating can be applied in an extremely short period of time without undercoating the outer wall materials, inner wall materials, ceiling materials, etc. of various buildings made of wood, concrete, metal, ceramics, bricks, boards, panels, tiles, etc. White mortar coating equivalent to or better than the method can be applied. The building material coating composition of the present invention exhibits its effectiveness not only in exterior wall coating of houses and the like, but also in civil engineering sites.

Claims (4)

A building material coating composition comprising cement or white cement, slaked lime, aggregate, ethylene-vinyl acetate copolymer resin or ethylene-vinyl chloride copolymer resin, and a cationic acrylic resin. 2. The ethylene-vinyl acetate copolymer resin is an ethylene-vinyl acetate copolymer, an ethylene-vinyl acetate-vinyl chloride copolymer, an ethylene-vinyl acetate-acrylic ester copolymer, or a mixture thereof. The composition for building material coating described in 1. 0.1 to 2 kg of reinforcing fiber, 0.2 to 10 kg of ethylene-vinyl acetate copolymer resin or ethylene-vinyl chloride copolymer, and 0 of cationic acrylic resin to 25 kg of solid content mixture for mortar The composition for building material coating according to claim 1, comprising 1 to 5 kg.   A building material coated with a building material coating composition selected from claims 1 to 3.