JP2001335385A - Inorganic cured body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inorganic cured body which contains reinforcing fibers, and is improved so that its carbonation may be prevented even when left under a severe carbonic acid gas atmosphere. SOLUTION: Treated layers are formed on an inorganic board which is made by molding and hydraulically curing a composite containing reinforcement fiber as a component. The treated layers consist of a treated layer 2 which is formed by applying an acrylic-based coating on a front surface of the inorganic board 1, and a treated layer 2 which is formed by applying a water repellent on a rear surface of the same 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cured inorganic material obtained by molding a composition containing a water-hardened inorganic material and a reinforcing fiber as components and hardening the same to form a treated layer on an inorganic plate. .

[0002]

2. Description of the Related Art Conventionally, inorganic hardened materials containing reinforcing fibers have been used for exterior materials, roof tiles and the like. As this inorganic cured material, water-hardened inorganic materials such as cement,
It is known that a reinforcing fiber such as pulp fiber or synthetic fiber, a siliceous material such as silica sand, and a composition containing an inorganic additive material or the like, if necessary, are molded and water-hardened by a papermaking method or the like. . The above-mentioned inorganic hardened body has surface cosmetic properties, and
In order to impart water resistance and moisture resistance, a treated layer is formed by applying an acrylic paint on the front surface or the back surface of the inorganic plate. The back surface of the inorganic plate refers to the side in contact with the substrate when the inorganic cured body is installed on a substrate such as a base wall or a plate, and the surface of the inorganic plate is the surface of the inorganic cured body opposite to the substrate. It refers to the side where the appearance is visible.

[0003]

The inorganic cured product on which the treatment layer coated with the acrylic paint is formed has good water resistance and moisture resistance. It is desired to maintain high quality even in a harsh environment. In a harsh environment, for example, carbonation (neutralization;
C. 80% RH, carbon dioxide gas is left in an atmosphere of 5% by volume for 20 hours), and then in an environment where freezing and thawing are repeated (for example, 300 cycles of frost damage promotion test of ASTM-C666-90A method). Put it. Under such a severe environment, the conventional inorganic cured product has not been sufficiently satisfactory.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an inorganic cured material containing reinforcing fibers, which can maintain the quality even under a severe environment. Is to provide the body.

[0005]

According to a first aspect of the present invention, there is provided an inorganic cured product, wherein a treatment layer is formed on an inorganic plate obtained by molding a composition containing a water-curable inorganic material and a reinforcing fiber as components and then water-curing the composition. The cured inorganic material has a treated layer formed by applying an acrylic paint on the front side of the inorganic plate, and a treated layer formed by applying an alkoxysilane-based water repellent on the back side.

The present inventor has set out the following in order to achieve the above object.
As a result of diligent studies, the use of a treatment layer on the back side formed by applying an alkoxysilane-based water repellent compared to a treatment layer formed by applying an acrylic paint on the front and back sides, The present inventors have found that even under a severe environment in which freezing and thawing are repeated after neutralization with carbon dioxide gas, the quality is excellent, and the present invention has been completed.

[0007] The inorganic cured product according to the second aspect is the first aspect.
In the inorganic cured product described above, the alkoxysilane-based water repellent is represented by the following structural formula (1). R ¹ Si (OR ² ) ₃ (1) wherein R ¹ represents an alkyl group having 6 to 10 carbon atoms and R ² represents a methyl group or an ethyl group. The inorganic cured product according to claim 2, wherein the alkoxysilane-based water repellent is 30 to 100 g.
/ Cm ² . As described above, the strength and the like of the inorganic cured product can be maintained even in a severe environment.

[0008]

FIG. 1 is a schematic sectional view showing an example of an embodiment corresponding to the first to third aspects of the present invention. The cured inorganic material of the present invention comprises a water-cured inorganic material, and an inorganic plate 1 obtained by molding and water-curing a composition containing reinforcing fibers as components, and an acrylic-based material on the surface side of the inorganic plate 1. It has a treatment layer 2 formed by applying a paint, and a treatment layer 3 formed by applying an alkoxysilane-based water repellent on the back side.

The constituent materials of the composition include a water-hardened inorganic material and a reinforcing fiber. The water-hardening inorganic material includes Portland cement and the like. Examples of the reinforcing fibers include pulp fibers; synthetic fibers made of a synthetic resin such as an acrylic resin, a vinylon resin, and a polypropylene resin. These fibers may be used alone or in combination. Above all, pulp fibers are preferable as the reinforcing fibers. Further, as a constituent material of the composition, a siliceous material such as fly ash and silica stone powder, and if necessary, an inorganic additive such as calcium carbonate and aluminum hydroxide may be used.

The mixing ratio of the above constituent materials is such that the water-curable inorganic material is 30 to 70% by weight, preferably 35 to 60% by weight, and the reinforcing fiber is 1 to 10% by weight, preferably Is 3 to 5% by weight, and the siliceous material is 20 to 60% by weight, preferably 30 to 55% by weight.

A composition containing these constituent materials is formed by means such as a papermaking method or cast press molding. The molded product is cured with water to form an inorganic plate.

In the cured inorganic material of the present invention, the treated layer 2 on the front side of the inorganic plate 1 is formed by applying an acrylic paint, and the treated layer 3 on the back side is made of an alkoxysilane-based water repellent. It was formed by coating.

The acrylic paint for forming the treatment layer 2 on the front side is not particularly limited as long as it is commonly used for inorganic cured products. For example, acrylic paints, fluorine-based paints, acrylic silicone-based paints, and inorganic paints can be used. Can be used.

The alkoxysilane-based water repellent for forming the treatment layer 3 on the back side is preferably represented by the following structural formula (1). R ¹ Si (OR ² ) ₃ (1) (R ¹ represents an alkyl group having 6 to 10 carbon atoms, and R ² represents a methyl group or an ethyl group.) The coating amount of the alkoxysilane-based water repellent is as follows. , 30 to 100 g / cm ² is preferable. If the amount is too small, the effect of maintaining the quality is reduced, and if the amount is too large, the strength and the like of the inorganic cured product may be reduced.

The inorganic cured product is prepared by applying an acrylic paint on the front side of the inorganic plate 1, applying an alkoxysilane-based water repellent on the back side, and then curing or drying. The inorganic cured material is used as a building material such as an exterior material or a tile. By forming such a layer structure, the inorganic cured body can maintain good quality even under a severe environment such as repeated freezing and deicing after being neutralized with carbon dioxide gas. is there.

[0016]

EXAMPLES In order to confirm the effects of the present invention, examples and comparative examples were prepared. First, an inorganic plate was produced as follows.

(Inorganic board) Portland cement 50 parts by weight Silica powder 45 parts by weight Pulp fiber 5 parts by weight The composition blended at the above blending ratio has a solid content of 6 to 8% by weight.
Thus, an aqueous slurry was obtained. A paper is made using this aqueous slurry and dehydrated to a water content of 55% by weight.
At a pressure of 50 kg / cm ² , an inorganic plate was obtained.

(Examples 1 to 3 and Comparative Examples 1 and 2) Acrylic paint B (V-Seran # 300-50DK, manufactured by Dainippon Paint Co., Ltd.) was applied to the surface side of the inorganic plate and fired. The thickness of the applied coating film was 25 to 35 μm.

In the examples, the following alkoxysilane-based water repellents were applied on the back side of the inorganic plate, and in the comparative examples, the following acrylic paints were applied. As the alkoxysilane-based water repellent, solvent-based water repellents A and B were used after dilution with ethanol. The water repellent A is represented by R ^{1 in the} above structural formula (1).
Is a water repellent (KBM3103C, manufactured by Shin-Etsu Chemical Co., Ltd.) having an alkyl group having 10 carbon atoms and R ² being a methyl group, and water repellent B is a water repellent having an alkyl group having 6 carbon atoms of R ^1. It is a liquid agent (Toshiba Silicone Co., Ltd., Toss Barrier). In addition, a water-based paint A (PE-2, manufactured by Modern Chemical Industry Co., Ltd.) was used as the acrylic paint.

The resulting inorganic plate was coated with the materials and coating amounts shown in Table 1 and in the amount applied, followed by drying to form a treated layer on the front side and a treated layer on the back side, to obtain a cured inorganic substance.

(Evaluation Method) The obtained cured inorganic material was evaluated by the swelling ratio (%) of a state in which freezing and thawing were repeated after neutralization treatment with carbon dioxide gas. The measurement was performed both when the neutralization treatment was performed and when the neutralization treatment was not performed as a reference. In the neutralization treatment, the obtained cured inorganic material was treated for 20 hours in an atmosphere at a temperature and a humidity of 40 ° C. and 80% RH and a carbon dioxide gas of 5% by volume. The repeated test of freezing and thawing (freezing damage promotion test) was performed according to ASTM-C666-9.
Based on the test method for the resistance of concrete to rapid freezing and deicing of 0, it was processed according to its procedure A for 300 cycles. In the evaluation, the swelling ratio (%) was determined from the dimensional change before and after the frost damage promotion test. The results are shown in Table 1. It was confirmed that all of the examples were better than the comparative examples.

[0022]

[Table 1]

[0023]

According to the first to third aspects of the present invention, by forming such a layer structure, good quality can be maintained even in a severe environment.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inorganic board 2 Processing layer on the front side 3 Processing layer on the back side

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 133/00 C09D 133/00 183/04 183/04 E04C 2/04 E04C 2/04 DF // ( C04B 28/02 (C04B 28/02 16:02) 16:02) Z (72) Inventor Mari Okumae 1048 Odakadoma, Kadoma, Osaka Pref. Matsushita Electric Works F-term (reference) 2E162 FA01 FA11 FC02 FD04 4F100 AC06 AE01A AE02 AJ04 AK25B AK52C BA03 BA07 BA10B CC01B CC01C DE01 DG01A EH46 GB07 JB02 JL09 4G012 PA04 PA22 4G028 CA01 CB04 CD03 4J038 CG001 DL031 NA04 NA07 PB05 PC04 PC10

Claims (3)

[Claims] 1. A cured inorganic material obtained by molding a composition containing a water-curable inorganic material and a reinforcing fiber as components and curing the water with an inorganic plate, wherein an acrylic material is provided on the surface side of the inorganic plate. An inorganic cured product having a treatment layer formed by applying a system paint and a treatment layer formed by applying an alkoxysilane-based water repellent on the back surface side. 2. The inorganic cured product according to claim 1, wherein the alkoxysilane-based water repellent is represented by the following structural formula (1). R ¹ Si (OR ² ) ₃ (1) (R ¹ represents an alkyl group having 6 to 10 carbon atoms, and R ² represents a methyl group or an ethyl group) 3. The method according to claim 1, wherein the alkoxysilane-based water repellent is 30.
Claim 1 or claim 2 inorganic cured body, wherein the range of to 100 g / cm ² is obtained is coated.