JPH07166110A - Coating compound for building board and building board - Google Patents

Abstract

PURPOSE:To obtain a coating compound having a feeling of a uniform natural stone even in a building board having an uneven pattern on the surface, applicable to the surface having a colorful design, providing a coating film having extremely excellent wear resistance by mixing a synthetic resin vehicle with an aggregate of a round corner shape. CONSTITUTION:This coating compound is obtained by mixing (B) a synthetic resin vehicle with (A) an aggregate of a round corner shape. The component A is preferably one or more fillers selected from artificial sand, natural sand, ground pottery, ground glass and plastic beads and an acrylic resin is preferably used as the component B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint used for painting building boards and a building board coated with the paint.

[0002]

2. Description of the Related Art Conventionally, as a means for giving a feeling of natural stone to a surface of a building board such as a wall material, an adhesive is applied to the surface of a building board, and an aggregate is sprinkled before the adhesive coating layer is cured. A method of forming a protective layer by adhering it to an adhesive coating layer and then coating a transparent protective coating on it (for example, Japanese Patent Laid-Open No. 64-27668). However, this method requires three steps, a step of applying an adhesive on the surface of the building substrate, a step of spraying an aggregate on it, and a step of applying and forming a protective layer on it, which complicates the coating process. And become longer. Further, in the aggregate spraying process, the air entrained in the aggregate is confined as fine bubbles in the protective layer thereabove, and the aggregate has poor wettability with the protective paint or the adhesive, and an aggregate portion of the aggregate is generated, Inadequate adhesion to building board. In particular, when the surface of the building board is provided with an uneven pattern, it is difficult for the aggregate to adhere to the slopes of the uneven pattern, and it is difficult to spread the aggregate uniformly. Instead of the above coating method, there is provided a coating material in which an aggregate is mixed with a synthetic resin vehicle (for example, JP-A-5-200354). According to the above-mentioned paint, the step of spraying the aggregate and the step of forming the protective layer can be omitted, and the painting step is only one step of painting the above-mentioned paint.

[0003]

However, in the above-mentioned conventional coating material, since hard and sharp aggregates such as plastic shards, glass shards, ceramic shards and concrete shards are used as aggregates. However, there is a problem that the sharp corners of the aggregate existing on the coated surface become scratched by an external force such as friction, and the aggregate easily falls off from the coating film.

[0004]

As a means for solving the above-mentioned conventional problems, the present invention provides a paint for building boards in which a round-cornered aggregate is mixed with a synthetic resin vehicle. As the synthetic resin vehicle used in the present invention, acrylic resins, vinyl acetate resins, styrene resins, vinyl chloride resins, vinylidene chloride resins, alkyd resins, urethane resins, epoxy resins, melamine resins, urea resins and the like are generally used for paints. There are organic solvent solutions or emulsions of synthetic resins used as vehicles. The synthetic resin vehicle may be colorless and transparent or colored.

The aggregate used in the present invention is artificial sand,
There are natural sand, crushed ceramics, crushed glass, synthetic resin beads, and the like, which are round-cornered shapes such as spherical and ellipsoidal shapes. The above-mentioned aggregate originally has a rounded corner shape, and a sharp-angled aggregate may be worn into a rounded corner shape. The aggregate may be colorless or colored and preferably has a particle size of 20.
˜1500 μm. If aggregates with a particle size of less than 20 μm are used, the aggregate will not be recognized as dots in the coating film and the natural stone feeling will be poor, and if it exceeds 1500 μm, the nozzle of the coating machine will be clogged during spray coating. It will be easier.

In the coating material of the present invention, the above-mentioned aggregate is mixed in a range of 5 to 100% by weight with respect to the synthetic resin content of the synthetic resin vehicle. Agents, anti-aging agents, ultraviolet absorbers, leveling agents, viscosity improvers and the like may be added.

Building boards coated with the paint of the present invention include fiber cement board, gypsum board, magnesium carbonate board, calcium silicate board, inorganic board such as asbestos board, plywood,
There are wooden boards such as particle boards and hard boards,
The surface is usually provided with an uneven pattern.

In order to coat the surface of the building substrate with the paint of the present invention, usually, a transparent sealer paint or a colored sealer paint is first applied to the surface of the building substrate to prevent the paint from penetrating into the building substrate. The intermediate coating material is applied to perform surface treatment, the coating film of the intermediate coating material is dried, and then the coating material of the present invention is applied. An air spray, an airless spray, a flow coater or the like is usually used for coating the paint. The coating amount is generally 50 to 200 g / m ² as a paint, preferably a 80 to 150 g / m ² approximately.

[0009]

The coating material of the present invention contains an aggregate, and the building substrate surface is coated with a natural stone feeling by the aggregate.
The aggregate has a rounded corner shape and has little mutual interference, and substantially the entire surface of the aggregate is covered with a synthetic resin vehicle. Therefore, the aggregate is firmly bonded to the synthetic resin in the coating film, and there is no sharp cusp.
Almost no aggregates fall off from the coating film, and even if there is an uneven pattern on the surface of the building substrate, a coating film having a substantially uniform particle distribution is formed on the bottom surface of the concave portion, the surface convex portion, and the inclined surface. Further, as the aggregate, those having various diameters and those having various colors can be selected, and therefore the coating material of the present invention can provide coating films having various design properties. Further, defects such as hair cracks on the surface of the building substrate are concealed by the aggregates in the coating film and can be finished inconspicuously.

[0010]

Example 1 A transparent sealer paint was spray-applied at a rate of 85 g / m ^{2 on} the surface to be coated of a fiber-cement substrate having a smooth surface, dried, and then coated with a concealing acrylic resin intermediate paint.
A base treatment is performed by spray coating at a rate of 0 g / m ² . After performing the above-mentioned base treatment, a transparent acrylic resin emulsion (solid content 50% by weight) was used as a vehicle for the building substrate, and 100 parts by weight of the vehicle was subjected to abrasion processing with a ball mill to form round-cornered silica sand ( Particle size 90-3
(00 μm) 40 parts by weight was added and uniformly mixed and sprayed with an airless spray coater at a rate of 120 g / m ² and left standing for 20 minutes at room temperature for setting, then at 120 ° C. for 10 minutes. A coating sample A was prepared by performing curing.

Example 2 A building substrate similar to that of Example 1 was subjected to the same base treatment as in Example 1, and a transparent acrylic resin emulsion (solid content 50% by weight) was used as a vehicle, and 100 parts by weight of the vehicle was spherical. Acrylic resin beads (manufactured by Toyobo Co., Ltd., trade name Tough, particle size 90-150
The coating composition B was prepared by spraying an upper coating composition prepared by adding 25 parts by weight of 100 μm) and mixing it uniformly with an airless spray coating machine at a rate of 100 g / m ² and performing the same setting and curing as in Example 1.

Comparative Example 1 Coating is carried out in the same manner as in Example 1, except that a transparent acrylic resin emulsion (solid content 50
%) As a vehicle, and 40 parts by weight of commercially available sharp-edged silica sand (sieve size range of 48 to 170 mesh) was added to 100 parts by weight of the vehicle. The same setting and curing as those in No. 1 were performed to prepare a coating sample C.

[Surface Abrasion Test] The above coated samples A, B, C
Table 1 shows the results of the surface wear test (JIS-A-1453) of the above. [Test conditions] Tester: Taber type abrasion tester Test load: 530g Total rotation speed: 500 rotations According to JIS-A-1453

[Table 1] *: Average value of N = 3

[0014]

Therefore, in the present invention, even a building board having an uneven pattern on the surface can be coated on a surface having a uniform natural stone feeling and various design characteristics, and the coating film has abrasion resistance. Is extremely excellent in

Claims (3)

[Claims] 1. A paint for building boards, characterized in that round-cornered aggregate is mixed with a synthetic resin vehicle. 2. The filler is one or more fillers selected from round-cornered artificial sand, natural sand, ground ceramics, ground glass, and plastic beads.
Paint for building board described in 3. A building board whose surface is coated with a paint in which a round-cornered aggregate is mixed with a synthetic resin vehicle.