JP2002210725A - Cement tile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strong cement tile capable of preventing an invasion of rainy water into a base material of the tile by coating a surface of a base. SOLUTION: The cement tile 10 is obtained by overcoating an acrylic emulsion paint on a waterproof undercoating paint on the surface of the base. The tile 10 is obtained by steam curing the base after molding for 4 to 6 hours, then coating the waterproof undercoating paint of a thickness of 50 to 150 g/m2 on the base, and then autoclave curing the base for 10 to 24 hours.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement roof tile having a small roof tile surface painted.

[0002]

2. Description of the Related Art Conventionally, roof tiles made of cement are neutralized with time when exposed and constructed outdoors, and the alkali reaction of the cement is lost and the cement is neutralized. When the cement is neutralized, the original strength of the tile itself made of cement is lost, and the tile is very easily broken.

[0003] The above-mentioned phenomenon of strength reduction is particularly remarkable in a portion where a roof tile is overlapped with a roof tile where rainwater is likely to accumulate. Conventionally, in order to solve the above-mentioned problems, the backside of the tile is painted to prevent the absorption of rainwater from the backside, and the strength of the tile can be maintained.

[0004] As a cosmetic method for inorganic building materials,
No. 42181. In the above-mentioned publication, in the method for producing an inorganic building material in which an undercoating is performed immediately after shaping on the surface of a shaped body formed by extruding a cement compound and autocure curing is performed, the glass transition point is 5 ° C. or lower as the undercoating. Acrylic-styrene emulsion paint is applied, and the glass transition point is 30 ° C as a top coat.
The above acryl-styrene emulsion paint is applied.

[0005] Japanese Patent Publication No. Hei 7-25605 discloses a method for producing a cement molding. In the above publication,
In a method for producing a cement-formed body, a cement composition obtained by mixing and kneading a cement material containing cement as a main component and water is placed in a desired mold, pressurized while forcibly constricting water, and shaped into a desired shape. Prior to performing the forced constriction, the surface of the composition placed in the mold is covered with a film of polyacrylamide in an amount of 0.075 parts by weight or more based on 100 parts by weight of cement of the composition. It has been made like that.

[0006]

As described above, in the prior art, water absorption from the back surface can be prevented by painting the back surface of the roof tile to prevent the strength of the roof from decreasing. However, in the state where the roof tiles are installed, the penetration of rainwater, which promotes the carbonation of cement, into the base material of the roof tiles is larger at the front end of the tile than at the back side where the roof is overlaid, but the front side is not sufficiently painted Rather, there was a problem that it was not possible to prevent the absorption of rainwater moisture from the small face.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to prevent the infiltration of rainwater into the inside of a tile base material by painting the surface of the base material. And to provide a cement tile having high strength.

[0008]

The cement tile according to the present invention according to the present invention is a cement tile in which an acrylic emulsion paint is overcoated on a waterproof base coat on a surface of a base material, wherein the cement tile is provided. After steam-curing the molded substrate for 4 to 6 hours, the substrate is coated with a waterproof undercoat 50-
After coating to a thickness of 150 g / m ² , autocure curing is performed for 10 to 24 hours.

The cement roof tile according to the second aspect of the present invention is one in which the undercoat and the topcoat are applied to a fore-edge surface.

[0010]

According to the first aspect of the present invention, there is provided a cement roof tile according to the present invention, wherein the cement roof tile is steam-cured for 4 to 6 hours, and then a waterproof undercoat is applied to the base material in an amount of 50 to 150 g / m ^2.
After applying to a thickness of 10 to 10
Since the time has elapsed, the amount of moisture absorbed by rainwater from the surface of the base material can be reduced by applying the waterproof coating undercoat. In addition, by applying the undercoat, the undercoat acts as a sealer and improves the adhesion with the overcoat, and even if the overcoat deteriorates due to outdoor exposure, it can be hardly peeled off. The performance of preventing water absorption can be improved.

In the cement roof tile according to the second aspect of the present invention, since the undercoating paint and the topcoating paint are applied to the fore-edge surface, the intrusion of rainwater from the fore-edge surface is prevented by coating the fore-edge surface. It is possible to maintain the long-term strength of the tile by preventing deterioration inside the base material.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing a cement tile of the present invention, FIG. 2 is a cross-sectional view showing a small face of the cement tile of the present invention, and FIG. 3 is a description showing a water absorption comparison test of the small face of the cement tile of the present invention. FIG.

As shown in FIGS. 1 and 2, the cement roof tile 10 of the present invention is formed by applying an acrylic emulsion paint to a waterproof undercoat paint on the surface of a base material.

An acrylic paint is used as a waterproof undercoat paint. In the present embodiment, a product name manufactured by Mizutani Paint Co., Ltd. (hereinafter referred to as “CP wet coat” or “CP coat”).
Is used.

The CP coat is applied to a ceramic product during curing, and simultaneously cures the substrate and the coating material, thereby integrating the substrate and the coating material. In the CP coat, emulsion particles of liquid particles that coat the cement particles of the base material are generated.

The CP coat used in this embodiment is as follows.
It is formed mainly of a modified acrylate resin.

By applying the CP coat to the base material of the cement tile 10, the emulsion particles forming the CP coat adhere to the cement particles of the base material, and a coating film is formed around the cement particles.

The emulsion particles formed on the cement particles are further cured under pressure by autocure curing, and the cement particles are compacted to strengthen the film formation.

In this way, the substrate and the CP coat are integrated, and a highly waterproof coating film is formed on the surface of the substrate.

In the undercoating step of the cement roof tile 10, after the formed base material is steam-cured for 4 to 6 hours, a CP coat of a waterproof undercoat paint is applied to the base material at 50 to 150 g / m2.
After applying to a thickness of ^2, the autoclave curing is 10-2
It has been attached for 4 hours.

The autoclave curing is cured under a pressurized state of 10 k / cm ² under a saturated steam at 180 ° C.

The cement roof tile 10 is manufactured by a papermaking method. That is, the felt is poured into a raw material tank in which the dissolved cement raw material is stored, and the dissolved cement raw material is attached to the felt.

After transferring and laminating the felt to which the raw material of the cement roof tile 10 is adhered by a roll, pressing and molding, then steam curing, applying a CP coating paint to the fore-edge surface, and further, autocure curing Through the above steps, the product cement roof tile 10 is formed.

The base material of the cement roof tile 10 is formed by molding water as the main raw material and, if necessary, an aggregate, a lightweight aggregate, and reinforcing fibers.

In the cement roof tile 10 of the present invention, the undercoat and the topcoat are applied to the fore-edge surfaces 101 and 102.

The roof tiles 103 and 104 and the fore-edge faces 101 and 102 of the cement tile 10 which are overlapped when the roof tile 10 is roofed are painted, and the other parts, the front surface 105 and the back surface are unpainted. A portion 105 is formed.

Small edge 10 at the four peripheral edges of cement roof tile 10
1, 101, 102, 102 are painted and
1, 101, 102, and 102 prevent rainwater from entering the inside of the base material.

The cement roof tile 10 of the present invention is applied so that the small face of the cement roof tile has a thickness of 50 to 150 g / m ² .

As a method of coating the surface of the base material, a coating method such as a roll coater, a flow coater, and a spray is used.

As shown in FIG. 3, in this embodiment, a cut sample 20 of the cement roof tile 10 is used to apply 50 g of the coating amount.
/ M ² , and 150 g / m ² , a comparative test of water absorption performance was carried out with a comparative example not coated.

The method of the comparative test is as follows: water is placed in a container 30, and a cut sample 20 of a cement tile is immersed in water.
A comparative measurement of the amount of water absorption on the fore-edge is being conducted.

[Table 1] As shown in Table 1, as compared with the case where the undercoat was not applied, the sample coated with the CP coat had a small water absorption, and the water absorption of the 150 g / m ² sample with a large coating amount even after the lapse of time was small. It has become.

[0032]

The cement tile of the present invention according to claim 1 is
The cement roof tile is formed by steam curing the formed base material for 4 to 6 hours, and then applying a waterproof undercoat paint to the base material at 50 to 150 g /.
was coated to a thickness of m ^2, again autoclave curing is 10
Since it has been performed for 24 hours, the amount of moisture absorbed by rainwater from the surface of the base material can be reduced by applying the waterproof coating undercoat. In addition, by applying the undercoat, the undercoat acts as a sealer and improves the adhesion with the overcoat, making it difficult for the overcoat to be peeled off even when deteriorated due to outdoor exposure, and to be applied to the inside of the tile base material. The performance of preventing water absorption can be improved.

In the cement roof tile according to the second aspect of the present invention, since the undercoating paint and the topcoating paint are applied to the fore-edge surface, the intrusion of the rainwater from the fore-edge surface is prevented by coating the fore-edge surface. It is possible to maintain the long-term strength of the tile by preventing deterioration inside the base material.

[0034]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cement roof tile of the present invention.

FIG. 2 is a cross-sectional view showing a small edge surface of the cement tile of the present invention.

FIG. 3 is an explanatory view showing a water absorption comparison test of a small edge surface of the cement tile of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cement roof tile 101 Fore face 102 Fore face 103 Roofing part 104 Roofing part 105 Unpainted part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04D 1/28 E04D 1/28 EB28B 11/00 A F term (Reference) 4D075 AE07 AE27 BB56Y BB60Y BB79Y BB95Y CA13 CA38 DA23 DA34 DB12 DC02 EA13 EB22 4G028 FA01 4G055 AA01 BA04 BA35

Claims (2)

[Claims] 1. A cement tile in which an acrylic emulsion paint is overcoated on a waterproof base coat on the surface of a base material, wherein the cement roof is formed by steam curing the formed base material for 4 to 6 hours. , 50 to 150 g /
After applying to a thickness of m ^2, the
Cement roof tile characterized by being done for 24 hours. 2. The cement roof tile according to claim 1, wherein the undercoat and the topcoat are applied to a fore-edge surface.