JP2019039179A - Building board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building board capable of suppressing a decrease in durability. SOLUTION: The building board 1 of the present invention has a base material 10 made of a hydraulic inorganic material, and an impact dispersion unit 23 formed on the surface side of the base material 10 to disperse the impact received from a granular projectile. , Equipped with. [Selection diagram] Fig. 1

Description

  The present invention relates to a building board. In detail, it is related with the building board used suitably as an outer wall material etc. of a building.

  Conventionally, a building board having a coating film on the surface of a base material has been proposed. The coating film is formed for makeup and protection of the substrate, and is formed, for example, with a sealer layer, an enamel layer, and a clear layer (see, for example, Patent Document 1).

JP 2008-246340 A

  However, in the building board as described above, granular flying bodies such as sand may collide with the coating film and the coating film may be peeled off, which may reduce durability. In particular, in high wind areas such as high mountains such as high mountains and coastal areas, a granular flying object is likely to be generated due to strong winds, so that the problem of peeling of the coating film is likely to occur.

  This invention is made | formed in view of said point, and it aims at providing the building board which can suppress a durable fall.

One aspect of the building board according to the present invention is:
A substrate composed of a hydraulic inorganic material;
An impact dispersion portion that is formed on the surface of the substrate and disperses the impact received from the granular flying object.

In the present invention,
It is preferable that the impact dispersion portion has higher strength than the base material.

In the present invention,
It is preferable that the impact dispersion portion is composed of a large number of granular materials held at a uniform thickness on the surface of the base material.

In the present invention,
The granular material is preferably held by a resin material.

In the present invention,
It is preferable that the average particle diameter of the granular material is 0.1 mm or more and 1.0 mm or less.

In the present invention,
It is preferable that the back surface side of the said base material is provided with the scattering suppression member for suppressing the scattering of the said base material.

  In the present invention, the impact received from the granular flying object is dispersed at the impact dispersion portion, and the decrease in durability is suppressed.

FIG. 1 is a schematic sectional view showing an embodiment of a building board according to the present invention. FIG. 2 is a schematic diagram showing a durability test. FIG. 3 is a photograph showing before and after the durability test for Examples 1 and 2 and Comparative Examples 1 and 2.

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

  FIG. 1 shows a building board 1 according to this embodiment. In this building board 1, the protective layer 20 is formed on the entire surface of the base material 10, and the reinforcing layer 30 is formed on the entire back surface of the base material 10.

  The protective layer 20 includes a sealer part 21, a binder part 22, an impact dispersion part 23, and a surface layer part 24. The reinforcing layer 30 includes a scattering suppressing member 31 and an adhesive portion 32.

  As the base material 10, a ceramic base material used for applications such as roof tiles and outer wall materials is used. The ceramic base material is a cured body obtained by curing a hydraulic inorganic material. The hydraulic inorganic material is a mixture of a hydraulic glue, an inorganic filler, a fibrous material, and the like, and is cured and cured after such a hydraulic inorganic material is formed into a desired shape.

  Although it does not specifically limit as a hydraulic glue, For example, 1 type or multiple types of what was chosen from Portland cement, blast furnace cement, blast furnace slag, calcium silicate, gypsum, etc. can be used. In addition, as the inorganic filler, fly ash, microsilica, silica sand, etc., and as the fibrous material, inorganic fibers such as pulp and synthetic fibers, and metal fibers such as steel fibers are used alone or in combination. Can be used. Molding can be performed by methods such as extrusion molding, cast molding, papermaking molding, press molding, etc., and after molding, autoclave curing, steam curing, and room temperature curing are performed as necessary to produce a ceramic base material be able to.

  The sealer portion 21 is a layer formed on the surface of the base material 10 mainly in order to ensure the concealability of the base material 10 and the adhesion of the protective layer 20 to the base material 10. As the sealer coating used to form the sealer portion 21, a permeable type primer material made of a low molecular weight resin or an emulsion having a small particle diameter is used. Specifically, for example, an acrylic emulsion resin was prepared by adding a pigment such as titanium oxide, an iron oxide pigment, carbon black, calcium carbonate, an additive such as butyl cellosolve or an antifoaming agent, water, and the like to stir and disperse. Things are used as sealer paints.

  The binder part 22 is a layer mainly provided for adhering and holding the impact dispersion part 23 to the sealer part 21 and for reducing the impact force received by the impact dispersion part 23. Moreover, it is preferable that the binder part 22 has the high concealing power of the base material 10, is excellent in durability, has a wide variety of colors, and can contribute to the improvement of the appearance design of the building board 1. Such a binder part 22 is formed of enamel, for example. That is, the binder part 22 is formed to include a resin material that is a cured resin and a coloring material such as a pigment or a dye, and the granular material constituting the impact dispersion part 23 is bonded to the sealer part 21 by the resin material. Is held. Colored paints can be used.

  The binder part 22 is formed, for example, by drying and curing a paint such as an enamel paint. Specifically, a pigment such as titanium oxide, iron oxide pigment, carbon black, barium sulfate, an additive such as butyl cellosolve, an antifoaming agent, a thickener, water, etc. are added to an acrylic emulsion resin, and the mixture is stirred and dispersed. The prepared one can be used as an enamel paint.

The thickness of the binder part 22 is not particularly limited, but is 60 μm or more and 120 μm or less, preferably 60 μm or more and 100 μm or less, and more preferably 60 μm or more and 80 μm or less in consideration of the retainability of the impact dispersion part 23. Further, when the binder 22 is of the type containing an acrylic emulsion resin, it is preferable that the compressive modulus is 1560N / ^{m 2} or more 3140N / ^{m 2} or less.

  The impact dispersion part 23 is a layer mainly having an action of dispersing the impact received from the granular flying object colliding with the protective layer 20 in the impact dispersion part 23 so as to spread from the collision part of the flying object. Moreover, since the impact dispersion | distribution part 23 also has the effect | action which makes the base material 10 hard to break with the colliding granular flying body, it is preferable that the impact dispersion | distribution part 23 is higher intensity | strength than the base material 10. FIG. Thereby, compared with the base material 10 which does not have the impact dispersion | distribution part 23, it becomes difficult to produce a damage.

  The impact dispersion part 23 is preferably composed of a large number of granular materials 25. Thereby, the impact dispersion | distribution part 23 can be formed by dispersion | distribution of the granular material 25, and manufacture of the building board 1 becomes easy. Further, it is preferable that the impact dispersion portion 23 has a large number of granular materials 25 formed on the surface side of the substrate 10 with a uniform thickness. Thereby, an impact spreads easily to the impact dispersion | distribution part 23, and the impact resistance of the building board 1 is easy to improve. In addition, the thickness of the impact dispersion | distribution part 23 is substantially the same as the average particle diameter of the below-mentioned granular material. The term “uniform” as used herein is not strictly uniform, and may have a thickness variation of about several hundred μm.

  As the granular material 25, it is preferable that it is a thing whose hardness is larger than the base material 10, for example, silica sand etc. are used. Moreover, it is preferable that the average particle diameter of the granular material 25 is 0.1 mm or more and 1.0 mm or less, and it is more preferable that it is 0.5 mm or more and less than 0.8 mm. If the average particle size of the granular material 25 is less than 0.1 mm, the granular material 25 may be buried in the binder portion 22 and the impact dispersibility of the impact dispersion portion 23 may be reduced. When the average particle size of the granular material 25 is larger than 1.0 mm, the portion buried in the binder portion 22 is reduced, and the granular material 25 is bonded to the protective layer 20 by the impact when the granular flying object collides with the protective layer 20. It becomes easy to drop off from the portion 22. In addition, the median diameter (D50) at the time of measuring a particle size distribution using a laser diffraction type particle size distribution measuring apparatus can be employ | adopted for the average particle diameter of the granular material 25, for example. The thickness of the binder portion 22 is adjusted so that the granular material 25 is held without falling off, and specifically, is adjusted according to the average particle size of the granular material 25.

  The surface layer portion 24 is a layer mainly provided to reduce the falling off of the granular material 25 from the impact dispersion portion 23. For this reason, it is preferable that the surface layer part 24 is a coating film which couple | bonds many granular materials 25. FIG. The surface layer part 24 is formed with a clear coating film, for example. Examples of the clear paint used to form the clear coating film include an acrylic emulsion paint. As the acrylic emulsion paint, it is preferable to use an aqueous paint such as an acrylic resin paint based on an acrylic emulsion or an acrylic silicone resin paint based on an acrylic silicone emulsion in order to reduce environmental burden. The acrylic emulsion paint may contain aggregates such as acrylic beads and mica, thereby improving the design.

  The reinforcing layer 30 is a layer mainly having a function to reinforce the base material 10 to reduce breakage such as cracks and to reduce the scattering of fragments even when the base material 10 is damaged. The reinforcing layer 30 is formed by adhering the scattering suppressing member 31 to the back surface of the base material 10 with the adhesive portion 32. As the scattering suppression member 31, a net (woven fabric) or a nonwoven fabric formed of a fiber material such as glass fiber or synthetic resin fiber can be used. Further, the adhesive portion 32 is a cured product of an adhesive, and for example, an epoxy resin adhesive can be used as the adhesive.

When manufacturing the building board 1 as shown in FIG. 1, first, a sealer paint is applied to the surface of the base material 10 and dried to form a sealer portion 21. At this time, the sealer coating is preferably applied to the surface of the substrate 10 at an application amount of 32 g / m ² or more and 76 g / m ² or less. And drying is preferably performed under conditions of 80 ° C. or higher and 140 ° C. or lower and 1 minute or longer and 3 minutes or shorter using, for example, a jet dryer. The sealer coating can be applied using a spray gun, roll coater, flow coater, curtain coater, or the like.

Next, after the paint is applied to the surface of the sealer portion 21, before the paint is dried, the granular material 25 is spread on the surface, and then the paint is dried and cured to thereby form a binder part that is a cured product of the paint. 22 and an impact dispersion portion 23 composed of a large number of granular materials 25 are formed. The coating material forming the binder part 22 is preferably applied to the surface of the sealer part 21 at an application amount of 76 g / m ² or more and 140 g / m ² or less. And it is preferable to perform drying on 80 to 120 degreeC and the conditions for 1 minute or more and 3 minutes or less using a jet dryer, for example. The coating of the binder 22 is the same as that for the sealer coating. The scattering amount of particulates 25 can be suitably set according to the average particle diameter of the granules 25, for example, be a 750 g / ^{m 2} or more 950 g / ^{m 2} or less.

Thereafter, a coating material for forming the surface layer portion 24 on the surface of the impact dispersion portion 23 is applied and dried. At this time, the coating is preferably applied to the surface of the impact dispersion portion 23 at an application amount of 32 g / m ² or more and 76 g / m ² or less. And drying is preferably performed under conditions of 80 ° C. or higher and 140 ° C. or lower and 1 minute or longer and 3 minutes or shorter using, for example, a jet dryer. The coating of the surface layer portion 24 is the same as that for the sealer coating.

  Further, the reinforcing layer 30 is obtained by applying an adhesive to the back surface of the base material 10 and then stacking the scattering suppressing member 31 on the adhesive and drying and curing the adhesive to form the adhesive portion 32. The curing conditions for the adhesive can be set as appropriate depending on the type of adhesive and the amount of coating.

  The building board 1 of this embodiment is constructed as an outer wall material or the like constructed in a building provided in a strong wind region (for example, a high altitude region such as a high mountain with an altitude of 3000 m or higher, and a coastal region). Is assumed. In this case, the building board 1 is used under the condition that the negative pressure applied to the outer wall is approximately 8700 Pa and the outer wall is exposed to a wind speed of 50 m / sec to 90 m / sec. Therefore, when constructing the building board 1 as an outer wall material on the wall base, it is preferable to employ a direct fastening method in order to make the building board 1 difficult to be scattered. The direct fastening method is a method in which the building board 1 is directly fixed to the surface of the wall base with a fixing tool such as a screw, and a ventilation layer is not formed between the wall base and the building board 1 (not a ventilation method). It is. Thereby, even if it is environmental conditions with a large negative pressure and wind speed, scattering of the building board 1 can be reduced.

  Hereinafter, the present invention will be specifically described by way of examples.

Example 1
As the base material 10, a ceramic base material was used. The sealer part 21 was formed by apply | coating the sealer coating which has acrylic emulsion resin as a main component to the surface of this base material 10, and making it dry and harden | cure. Next, after the sealer portion 21 was preheated, an enamel paint mainly composed of an acrylic emulsion resin was applied. Next, before the enamel paint dried, a large number of granular materials 25 were sprayed. As the granular material 25, No. 5 sand (average particle size: 0.5 mm) manufactured by Keimu Bussera Co., Ltd. was used. The granular material 25 is silica sand (color sand) colored in black, red, brown, etc., and the amount of the granular material 25 applied was 870 g / m ² . This silica sand has a true specific gravity of 2.55 or more and 2.65 or less, a weight of liters of 1.5 or more and 1.7 or less, a porosity of 0.6 or more and 0.9 or less, and a water absorption of 0.1% or more and 0. .3% or less and Mohs' hardness is 7. Thereafter, the enamel paint was dried, cured, and cooled to form the binder portion 22 and the impact dispersion portion 23. Next, after preheating the impact dispersion part 23, a clear coating mainly composed of an acrylic emulsion resin was applied to the surface of the impact dispersion part 23, followed by drying, curing, and cooling to form the surface layer part 24.

  Next, after the two-component mixed epoxy resin adhesive is applied to the back surface of the base material 10, the scattering suppressing member 31 is overlaid on the adhesive, and then the adhesive is cured by drying to cure the adhesive. The reinforcing member 30 was formed by bonding the scattering suppressing member 31 to the back surface of the base material 10 with the bonding portion 32 that is an object. As the scattering suppression member 31, a biaxial assembly fabric having heat resistance and alkali resistance (threads arranged in an orthogonal direction and fixed with an adhesive) was used.

  In this way, a building board 1 was obtained.

(Example 2)
A building board 1 was obtained in the same manner as in Example 1 except that as the granular material 25, No. 4 sand (silica sand having an average particle diameter of 0.8 mm) was used instead of No. 5 sand.

(Comparative Example 1)
The building board 1 was obtained in the same manner as in Example 1 except that the impact dispersion part 23 was not formed and the surface layer part 24 was formed on the surface of the binder part 22.

(Comparative Example 2)
As the base material 10, the building board 1 was obtained like Example 1 except having used the steel plate instead of the ceramic base material.

(Durability test (sandblast test))
As shown in FIG. 2, the test body T of a predetermined magnitude | size is produced from the building board 1 of each Example and each comparative example, the test body T and the injection gun G are made to oppose, and 5 sand from the injection gun G is shown. Was sprayed on the surface of the specimen T as an abrasive S. And the surface of the test body T before and behind a test was observed.

This test was a deterioration acceleration test, and for example, a test for reproducing the impact of dust, volcanic gravel and the like was performed. Specifically, the test conditions were set on the assumption that the building board 1 was an outer wall material constructed for 10 years in a building provided at an altitude of about 3,000 m. That is, volcanic sand and gravel having a diameter of 1 mm, a volume of 5.23 × 10 ⁻¹⁰ m ³ / grain, a specific gravity of 3, and a mass of 0.00157 g / grain collide with the surface of the building board 1 at a wind speed of 50 m / sec for 10 years. Assuming this, the test conditions were set. As test conditions, No. 5 sand was used as the abrasive S assuming volcanic sand and gravel, and a spray gun G having an injection pressure of 0.5 MPa was used. The wind speed for each distance between the spray gun G and the test specimen T was measured so that the impact speed of the abrasive S on the test specimen T was 55 m / s. As a result, the distance between the two was set to 25 cm. Under this setting, since it was 220 grains / cm ² · s in the central part of the test specimen T, the durability test was performed by setting the spraying time as the acceleration time in terms of 10 years to 15 seconds.

  As shown in FIG. 3, the deterioration of the protective layer 20 after the test was less in Example 1 than in Example 2 and Comparative Examples 1 and 2. In Example 2, the protective layer 20 after the test was slightly degraded as compared with Example 1, but there was no problem in practical use. On the other hand, in Comparative Examples 1 and 2, a defect occurred in the protective layer 20 after the test, and the surface of the substrate 10 was exposed.

DESCRIPTION OF SYMBOLS 1 Building board 10 Base material 23 Impact dispersion part 25 Granules 22 Resin material (binder part)
31 Splashing suppression member

Claims (6)

A substrate composed of a hydraulic inorganic material;
An architectural board, comprising: an impact dispersion portion that is formed on the surface side of the substrate and disperses an impact received from a granular flying object. In the building board of Claim 1,
The building board according to claim 1, wherein the impact dispersion portion is stronger than the base material. In the building board of Claim 1 or 2,
The building board according to claim 1, wherein the impact dispersion portion is composed of a large number of granular materials held at a uniform thickness on the surface side of the substrate. In the building board of Claim 3,
The said board | substrate is hold | maintained with the resin material, The building board characterized by the above-mentioned. In the building board of Claim 3 or 4,
The building board, wherein the granular material has an average particle size of 0.1 mm to 1.0 mm. In the building board as described in any one of Claims 1 thru | or 5,
A building board, wherein a scattering suppression member for suppressing scattering of the base material is provided on the back side of the base material.