JP2001048630A - Inorganic bearing face material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an inorganic bearing face material which can be used as an incombustible bearing face material having excellent durability, high nail holding force and small change rate of the length. SOLUTION: This inorganic bearing face material is produced in the following process. A compounded material consisting of 20 to 60 m% cement, 5 to 50 m% calcium silicate-based lightweight hydrothermally synthesized material essentially comprising tobermolite and/or xonotlite preliminarily prepared by hydrothermal synthesis of a lime source material and silica source material, 3 to 18 m% reinforcing fiber and 0 to 60 m% filler is molded in a wet process to obtain a green sheet as a single layer structure of one kind of a compounded material. Or the green sheet is produced as a multilayered structure of one or more kinds of compounded materials. Then, one or more net layers 5 are formed in the single layer structure or multilayer structure. The obtained structure has 0.5 to 1.2 bulk specific gravity, 10 to 30 N/mm bending strength and >=2.5 wall ratio with a small change rate in the length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic load-bearing surface material used as a substitute for a plywood for a wooden structure, which is widely used as a load-bearing surface material for wooden houses, and a method for producing the same.

[0002]

2. Description of the Related Art In general, a house may receive a load from the side due to an earthquake or wind pressure, and it is necessary to design the house in consideration of such a load. For this reason, plywood for wooden structures is widely used as a load bearing surface material in wooden houses in order to increase strength. On the other hand, as the inorganic material, conventionally, a fiber reinforced cement board such as a calcium silicate board,
Gypsum board or wood fiber reinforced cement board such as wood wool cement board is used, but the strength as a bearing surface material is insufficient, and the performance that can be used as a substitute for structural plywood has been obtained. There is no actual situation.

[0003]

However, it is difficult to say that plywood for wooden structures is a combustible material and has excellent durability. In addition, environmental destruction due to deforestation and problems on the living environment due to adhesives have been pointed out. On the other hand, ceramic boards such as fiber reinforced cement boards such as calcium silicate boards, gypsum boards, and wood wool cement boards have insufficient strength as load-bearing surface materials and are brittle. There is a problem that the property is poor and the holding power of the nail is low.

Accordingly, a first object of the present invention is to provide an inorganic bearing surface material which is nonflammable, has excellent durability, has a high nail holding force, and can be used as a bearing surface material having a small rate of change in length. That is. A second object of the present invention is to provide a method for producing an inorganic bearing surface material which is nonflammable, has excellent durability, has a high nail holding force, and can be used as a bearing surface material having a small rate of change in length. That is.

[0005]

According to the first aspect of the present invention, the calcium silicate-based lightweight water is obtained by hydrothermally synthesizing a calcareous material and a siliceous material in advance by 20 to 60% by mass of cement. A composition comprising 5 to 50% by mass of the thermally synthesized product, 3 to 18% by mass of reinforcing fibers and 0 to 60% by mass of a filler is obtained by wet molding, and has a bulk specific gravity of 0.5 to 1.2.
The first object is achieved by having a bending strength of 10 to 30 N / mm ² and a wall magnification of 2.5 or more.

According to the second aspect of the present invention, the inorganic bearing surface material is 20 to 60% by mass of cement, and a calcium silicate-based lightweight hydrothermal composition obtained by previously hydrothermally synthesizing a calcareous material and a siliceous material. % By weight, a mixture comprising 3 to 18% by mass of reinforcing fibers and 0 to 60% by mass of a filler is obtained by wet molding, and one or two or more types of green sheets are laminated in a plurality of layers. 0.5 to 1.2, bending strength 10
The first object is achieved by setting the wall magnification to ３０30 N / mm ² and a wall magnification of 2.5 or more.

According to a third aspect of the present invention, in the second aspect of the present invention, one or more green sheets are laminated on a green sheet layer, and one net layer is formed on the green sheet layer.
It is characterized by including more than one layer.

According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, a calcium silicate-based lightweight hydrothermal compound is obtained by previously hydrothermally synthesizing a calcareous material and a siliceous material. It is characterized by a bulk specific gravity of 0.05 to 0.3.

According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect of the present invention, the reinforcing fibers include pulp of 3 to 15% by mass and a Young's modulus of 5 kN / mm ² or more. Of fibers having a Young's modulus of less than 5 kN / mm ^{2 and} 0 to 2% by mass.

[0010] In the invention according to claim 6, the inorganic proof surface material is 20 to 60% by mass of cement, and a calcium silicate-based lightweight hydrothermal composition obtained by hydrothermally synthesizing a calcareous material and a siliceous material in advance. A single-layer or multi-layer green sheet obtained by wet molding a composition consisting of 3 to 18% by mass of a reinforcing fiber, 3 to 18% by mass of a reinforcing fiber, and 0 to 60% by mass of a filler is 1 to 20 N /
The above-mentioned second object is achieved by press-molding with a press pressure of mm ² and then curing.

[0011] In the invention according to claim 7, the inorganic proof surface material is 20 to 60% by mass of cement, and a calcium silicate-based lightweight hydrothermal composition obtained by hydrothermal synthesis of a calcareous material and a silica material in advance. A green sheet containing at least one or more net layers as a single layer or a multi-layer obtained by wet-molding a composition comprising 3 to 18 mass% of a reinforcing fiber and 0 to 60 mass% of a filler, The above-mentioned second object is achieved by press-molding with a press pressure of 20 N / mm ² and then curing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to FIGS. FIG.
1 is a cross-sectional view of a single-layer inorganic load-bearing face material according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a three-layer inorganic load-bearing face material. FIG. 3 is a cross-sectional view of a three-layer inorganic bearing surface material including two net layers. These inorganic load-bearing surface materials are made of a calcium silicate-based lightweight hydrothermal compound mainly composed of tobermorite-based and / or zonotlite-based materials obtained by hydrothermally synthesizing a calcareous material and a siliceous material in advance of 20 to 60 m% of cement. A green sheet obtained by wet molding a composition comprising 5 to 50 m%, a reinforcing fiber of 3 to 18% and a filler of 0 to 60 m% has a single-layer structure by one kind of blending (FIG. 1). One type of green sheet or 2
A single-layer structure and a single-layer structure and a multi-layer structure provided with at least one net layer 5 (FIG. 3) have a bulk specific gravity of 0.5. ~ 1.
2. The bending strength is 10 to 30 N / mm ² and the wall magnification is 2.5 or more, which has a small rate of change in length.

The calcium silicate-based lightweight hydrothermal composition used in these inorganic bearing surface materials uses a calcareous material and a siliceous material in advance, and has a molar ratio of calcium oxide to silica of 0.55 to 1.10. A slurry having a concentration of １５15% is hydrothermally synthesized at 150 to 230 ° C. using a stirring type auto grape, and has a bulk specific gravity of 0.05 to 0.3. Siliceous materials include silica stone, diatomaceous earth, silica fume, and the like, and calcareous materials include general-purpose materials such as quicklime. These calcium silicate-based lightweight hydrothermal compounds are tobermorite-based and / or zonotolite-based, and have a bulk specific gravity of 0.05 to 0.3 and a blending amount of 5 to 50%.

Here, if the bulk specific gravity of the calcium silicate-based lightweight hydrothermal composition is less than 0.05, the required strength as a load-bearing surface material and the holding power of the nail cannot be obtained. It is difficult to reduce the weight of the load-bearing surface material and secure good nailing properties. If the amount of the calcium silicate-based lightweight hydrothermal compound is less than 5%, it is difficult to reduce the weight of the load-bearing surface material and secure good nailing properties, and the length change rate becomes large. On the other hand, if it is 50% or more, it is not possible to obtain the necessary strength as a load-bearing surface material and the nail holding force.

As the reinforcing fibers, 3 to 15 m% of pulp and 0 to 2% of fibers having a Young's modulus of 5 kN / mm ² or more and 0 to 2 m% of fibers having a Young's modulus of less than 5 kN / mm ² are blended. Pulp is necessary for improving the bending strength of the inorganic load-bearing surface material, and is particularly effective for preventing cracking and cracking due to nailing, and for further improving nail holding power. If the blending amount of pulp is less than 3%, it is not sufficient for nailing workability. On the other hand, if it is 15m% or more, the length change rate becomes large and the durability is inferior.

Further, as a fiber other than pulp, in order to improve the bending strength and wall ratio as a bearing surface material,
5 kN / mm ² or more fibers having a Young's modulus higher than the bending Young's modulus of the matrix constituting the load-bearing face material are blended. In addition, in order to improve impact resistance, prevent cracking and cracking due to nailing, and further improve performance with respect to nail holding force, the material has a Young's modulus lower than the bending Young's modulus of the bearing surface material and is less than 5 kN / mm ² . Mix the fibers. Here, the fibers having a Young's modulus of 5 kN / mm ² or more include organic fibers such as polyvinyl alcohol fiber, polynosic fiber, aramid fiber, and hemp fiber, and inorganic fibers such as glass fiber and carbon fiber. On the other hand, fibers having a Young's modulus of less than 5 kN / mm ² include polypropylene fibers, polyester fibers,
There are organic fibers such as polyamide fiber, rayon fiber and polyvinyl chloride fiber.

The fiber length is 3 to 12 mm, preferably 3 to 6 mm. If the compounding amount of these fibers other than pulp is 3% or more, the fiber content becomes excessive and the surface properties are poor. When the total amount of fibers including pulp is 18 w% t or more, nonflammability cannot be obtained.

In the present embodiment, a wall magnification of 2.5 or more is obtained by using these constituent materials, which is lightweight, has high bending strength, has a small rate of change in length, and has excellent nailing and nail holding power. It is possible to achieve a load bearing surface material characterized by the following. Further, the wall magnification performance can be improved by forming a multilayer structure. The multilayer structure is preferably a two- or three-layer structure. The method of forming the multilayer can be arbitrarily selected from a method of laminating in a green sheet state in a papermaking process, a method of curing each layer as a single plate, and a method of bonding each layer with an inorganic and / or organic binder. . The inorganic bearing surface material containing the calcium silicate-based lightweight hydrothermal composition has a bulk specific gravity of 0.5 to 1.2, and when formed into multiple layers, the bulk specific gravity of each layer can be set within this range. In addition, the composition of each layer in the case of a multi-layer structure can be arbitrarily selected within the range of the composition of the present invention depending on the required performance.

As a method for producing this inorganic bearing surface material,
A green sheet is formed by slurrying a composition comprising cement, a calcium silicate-based hydrothermal composition and reinforcing fibers, formed into a green sheet by a papermaking method, press-formed at a press pressure of 1 to ²⁰ N / mm ² , and then cured to obtain an inorganic material. Obtain a load-bearing face material. For this production, a general-purpose production method such as a continuous papermaking method such as a round-mesh paper machine, a fourdrinier paper machine, a flow-on paper machine, and a batch molding method such as a dewatering press method is used. By using these methods alone or in combination, an inorganic load-bearing surface material having a single-layer or multilayer structure can be obtained. The molding pressure is 1 N / mm ²
If it is less than the required strength, nail holding power and surface smoothness cannot be obtained, while if it is more than 20 N / mm ² , the weight cannot be reduced and the nailing property is difficult. Curing of the inorganic bearing surface material includes natural curing, wet curing, steam curing and autoclave curing, and steam curing is preferred for shortening the curing time and workability such as nailing.

As shown in FIG. 3, nets can be combined within and / or between single or multiple layers to improve performance, if desired. The compounding of the net is effective for improving the performance of the inorganic load-bearing surface material, particularly for improving the wall magnification. Further, by compounding the net, it is possible to reduce the compounding amount of the reinforcing fiber. 4 to 6 are views showing a method for manufacturing an inorganic load-bearing surface material including a net. FIG.
FIG. 5 is a view showing a method for producing an inorganic load-bearing face material forming one layer of a net using a flow-on papermaking apparatus.
FIG. 6 is a view showing a method for producing an inorganic load-bearing surface material including two layers of a net using a combination of a plurality of flow-on papermaking apparatuses and a round-mesh papermaking apparatus. It is a figure showing an inorganic bearing surface material manufacturing method including two nets used.

Here, as a method of inserting a net,
There is a method of inserting when laminating in a green sheet state during papermaking and during the papermaking process. At this time, in order to improve the adhesion between the net and the molding layer, cement paste,
Inorganic binders such as water glass, silica fume, silica gel and alumina gel, and acrylic emulsions,
It is effective to use an organic binder such as a synthetic rubber latex such as SBR and a vinyl acetate emulsion and a binder obtained by combining these. Further, after each layer is cured as a single plate, it is also possible to bond each layer with only a plate material or with a net layer sandwiched therebetween using inorganic and organic binders.

Examples of the net include organic fibers such as polyvinyl alcohol fiber, polynosic fiber, aramid fiber, polypropylene fiber, polyester fiber, polyamide fiber, rayon fiber, polyvinyl chloride fiber and hemp fiber, and inorganic fibers such as glass fiber and carbon fiber. And metal fibers. The net is inserted into the whole board, and
Alternatively, insert a net tape into the circumference and / or middle part. As a method of manufacturing the inorganic load-bearing surface material into which the net shown in FIG. 3 is inserted, cement, 20 to 60% of cement, 5 to 50% of a calcium silicate-based lightweight hydrothermal compound prepared in advance, and reinforcing fibers 3 to 18 % And a filler consisting of 0 to 60% of a filler are kneaded with water to form a slurry, a round-mesh machine, a long-mesh machine, a flow-on machine,
A green sheet obtained by wet molding with a dehydration press molding machine or the like to have a single layer structure by one kind of blending,
The green sheet may have a multi-layer structure of one kind or two or more kinds, and a composite green sheet having a structure in which one or more net layers are provided in the single-layer structure and the multi-layer structure may be 1 to 20 N / After press molding with a press pressure of mm ² , curing is performed to obtain a plate material. In addition, after each layer was cured as a single plate in the multilayer structure, each layer was joined with an inorganic and / or organic binder using only a plate material or sandwiching a net layer, and pressed with a press pressure of 1 to 10 N / mm ² . After curing, a board material is obtained. This crimping is shown in FIG.
As shown in FIG. 6, after laminating by the adsorption laminating apparatus 10, the pressure is applied by the press machine 11.

The calcium silicate-based lightweight hydrothermal composition is prepared using a calcareous material and a siliceous material in advance, and the molar ratio of calcium oxide to silica is 0.55 to 1.10.
A tobermorite-based and / or zonotlite-based slurry obtained by hydrothermally synthesizing a 15% -concentration slurry at 150 to 230 ° C. using a stirring type autogrape is mainly used.
05 to 0.3. As the siliceous raw material, general-purpose raw materials such as silica stone and the calcareous raw material such as quicklime are used.

Next, Embodiments 1 to 14 will be described with reference to Tables 1 to 4 shown in FIGS. Example 1
Nos. To 14 were manufactured based on the raw material composition and manufacturing conditions shown in FIG. The entire raw material composition is indicated by mass% (m%). In Example 1 and Examples 5 to 14, the mixture obtained by mixing each raw material was mixed with 6 times water to form a slurry, and a single-layer green sheet obtained by a flow-on papermaking machine using this slurry was manufactured as shown in Table 1. 5 to 20 N / m shown in the conditions
Press molding was performed with a press pressure of m ² to obtain a single-layer plate having a thickness of about 10 mm. This plate was cured by natural curing after steam curing to obtain a specimen.

In Example 2, a slurry was prepared by adding 10 times the amount of water to the composition constituting the front and back phases of the composition shown in FIG. 7, and this slurry was used to obtain a slurry by a round-mesh paper machine. The single-layer green sheet was press-formed at a press pressure of 1 N / mm ² to obtain a 1.6 mm-thick raw sheet for the surface layer and the back layer. Further, of the composition shown in FIG. 7, 6 times water was added to the composition constituting the intermediate layer to form a slurry, and a 6 mm green sheet obtained by a flow-on paper machine using this slurry was used for the back layer. A green laminate was laminated on a green plate, and a surface green plate was further laminated on the green plate with a press pressure of 10 N / mm ² to obtain a green laminate having a total thickness of 8 mm. This green plate was cured naturally by steam curing and then cured to obtain a specimen.

Example 3 is a method similar to that of Example 2, except that a 1.7 mm thick raw sheet for the surface layer and a
Was obtained. When laminating this, the opening 5 ×
A 5 mm vinylon net was sandwiched between the back layer and the intermediate layer and between the intermediate layer and the surface layer, and pressed and formed with a press pressure of 10 N / mm ² to obtain a raw laminate having a total thickness of 9 mm. This green plate was cured naturally by steam curing and then cured to obtain a specimen.

In Example 4, a slurry was prepared by adding 10 times the amount of water to the composition constituting the front and back phases of the composition shown in FIG. 7, and the slurry was used to obtain a slurry using a round-mesh paper machine. A single-layer green sheet is press-formed at a press pressure of 10 N / mm ² , cured naturally after steam curing, and cured to a thickness of 1.
5 mm of cured plates for the surface layer and the back layer were obtained. further,
Among the formulations shown in FIG. 7, a 6 mm green sheet obtained by a flow-on paper machine using a slurry obtained by adding 6 times the amount of water to the composition constituting the intermediate layer was used to obtain 6 N / mm ^2.
And then cured naturally by steam curing and then cured to obtain a 6 mm cured plate. Next, a binder in which 10% of SBR latex was mixed with cement paste was applied on a hardened plate for a back layer, and an alkali-resistant glass fiber net having an opening of 5 × 5 mm was stacked thereon, and a hardened plate for an intermediate layer was laminated. Then, a binder obtained by mixing 10% of SBR latex with cement paste is applied thereon, and the opening is 5 × 5 m.
m of alkali-resistant glass fiber nets were laminated, a surface-layer cured plate was laminated, and pressed with a press pressure of 3 N / mm ² to obtain a green laminate having a total thickness of 10 mm. The laminate was steam-cured again, cured naturally, and cured to obtain a test sample. The plates were dried and tested. The results are shown in the table of FIG.

Comparative Examples 1 to 8 were manufactured based on the raw material composition and manufacturing conditions shown in FIG. Six times the amount of water was added to the mixture of each raw material to form a slurry, and a single-layer green sheet obtained by a flow-on paper machine using this slurry was pressed at a pressure of 10 to 25 N / mm ² under the production conditions shown in FIG. Pressure molding was performed under pressure to obtain a single-layer plate having a thickness of about 10 mm. This plate was steam cured, naturally cured, and cured to obtain a specimen. The calcium silicate-based lightweight hydrothermal composition zonotlite used had a bulk specific gravity of 0.15, but only the comparative example 6 used a hydrothermal composition having an insufficient bulk specific gravity of 0.40. . In Comparative Example 9, an asbestos-free calcium silicate plate having a bulk specific gravity of 0.8 and a thickness of 8 mm was used. In Comparative Example 10, a commercially available structural plywood having a thickness of 9 mm was used. These plates were dried and tested as in the examples. The results are shown in Table 4 of FIG.

As shown in the tables of FIGS. 9 and 10, the examples are lighter and have better bending strength, better nailing properties and better nail holding power than the comparative examples, and the wall magnification is notwithstanding the light weight. Has been greatly improved. In Comparative Example 4, incombustibility was not obtained because the amount of fibers was too large.
In comparison with the above, the bending strength was almost similar, the rate of change in length was significantly reduced, and the performance with the same or higher wall magnification was obtained. Regarding the incombustibility, all of the combustibles of Comparative Example 10 were more than the semi-combustible materials. In Comparative Example 6 using pearlite as a lightweight material other than the calcium silicate-based lightweight hydrothermal composition, the specific gravity was small, but the bending strength was low and the length change rate was large. As described above, each of the examples has significantly improved quality as compared with the conventional inorganic plate, and can be said to have sufficiently excellent performance as a substitute for structural plywood.

The calcium silicate lightweight hydrothermal composition shown in the tables of FIGS. 7 and 9 is made of powdered silica and quick lime as raw materials, has a calcium oxide / silica molar ratio of 0.83, and is stirred at a slurry concentration of 10%. Hydrothermal synthesis was performed by autocreep. The tobermorite system was hydrothermally synthesized at 180 ° C. for 3 hours and had a bulk specific gravity of 0.13. The zonotolite system was hydrothermally synthesized at 195 ° C. for 4 hours and had a bulk specific gravity of 0.15. The hydrothermal composition used in Comparative Example 5 was hydrothermally synthesized at 140 ° C. for 5 hours and had a bulk specific gravity of 0.40.
The specific gravity test was measured according to JIS A 5430.
The bending test was measured according to JIS A 5430.
The length change rate was measured according to JIS A 5430. Nailability: At the time of preparing a wall magnification test body, cracks and cracks of the test plate due to nailing were visually observed, and the nailability was evaluated.
Good if there is no abnormality ○, slightly abnormal if △,
Abnormal ones are indicated by x. The nail holding force was evaluated by visually observing the nailed portion of the test specimen after the wall magnification test, observing the expansion, cracking, and cracking of the nail hole.も の indicates that there was no abnormality and was good, や indicates that there was some abnormality, and X indicates that was abnormal. The wall magnification was measured in accordance with the Japanese style of the Japan Building Center, "Technical Regulations for Evaluation of Structural Strength of Low-Rise Buildings (Woody)". The fire prevention material test was performed on the non-combustible material according to the method specified in Notification No. 1828 of the Ministry of Construction, 1970. The semi-combustible material and the flame-retardant material were used in accordance with the method specified in Notification No. 1231 of the Ministry of Construction in 1976.

[0031]

According to the first to fifth aspects of the present invention,
Lightweight, non-flammable, excellent in dimensional stability, excellent wall magnification, excellent nailing performance. As a lightweight inorganic material, it is possible to obtain a high strength inorganic load-bearing surface material, which can be used as a substitute for structural plywood. Can be. In particular, according to the third aspect of the present invention, by providing the net layer, a higher strength inorganic load-bearing surface material can be obtained.

[0032] In the invention according to claims 6 and 7,
It is possible to produce an inorganic load-bearing surface material that is nonflammable, has excellent durability, has a high nail holding force, and can be used as a load-bearing surface material having a small rate of change in length.

[Brief description of the drawings]

FIG. 1 is a sectional view of a single-layer inorganic load-bearing face material.

FIG. 2 is a sectional view of a three-layer inorganic load-bearing face material.

FIG. 3 is a sectional view of a three-layer inorganic load-bearing face material including two nets.

FIG. 4 is a view showing a method for producing an inorganic load-bearing face material including one layer of a net using a flow-on papermaking apparatus.

FIG. 5 is a diagram showing a method for producing an inorganic load-bearing surface material including two nets using a combination of a plurality of flow-on papermaking apparatuses and a round-mesh papermaking apparatus.

FIG. 6 is a diagram showing a method for producing an inorganic load-bearing surface material including two nets using a combination of a plurality of flow-on papermaking apparatuses.

FIG. 7 is a table showing examples of the present invention.

FIG. 8 is a table showing examples of the present invention.

FIG. 9 is a table showing a comparative example of the present invention.

FIG. 10 is a table showing comparative examples of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Single-layer board 2 Surface layer 3 Intermediate layer 4 Back layer 5 Net 6 Raw material slurry 7 Suction box 8 Felt 9 Roll press 10 Adsorption lamination apparatus 11 Press machine 12 Making roll 13 Slurry vat 14 Wire cylinder

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 16:02 16:06) 111: 28 111: 30 111: 40 (72) Inventor Yonori Yamazaki Tokyo 2-12-10, Shiba-Daimon, Minato-ku Asano Slate Co., Ltd. (72) Inventor Hirofumi Ueda 2-12-10, Shiba-Daimon, Minato-ku, Tokyo Inside Asano Slate Co., Ltd. (72) Kohei Ota, Minato-ku, Tokyo 2-12-10 Shiba Daimon Asano Slate Co., Ltd. F-term (reference) 4G012 PA22 PA24 PC11 PC12 PC14 PC15 PE03 PE05 4G052 GA02 GA05 GA11 GA17 GA25 GB53 GB76 GC03 GC06 GC08 4G054 AA01 AA15 AB01 AC04 BA02 DA02

Claims (7)

[Claims] 1. A cement containing 20 to 60% by mass, 5 to 50% by mass of a calcium silicate-based lightweight hydrothermal composition obtained by previously hydrothermally synthesizing a calcareous material and a siliceous material, and 3 to 18 reinforcing fibers.
% By mass and a filler consisting of 0 to 60% by mass of a filler are obtained by wet molding, and have a bulk specific gravity of 0.5 to 1.2 and a bending strength of 10 to 30 N / mm.
Inorganic strength surface material characterized by at ² and walls magnification 2.5 or more. 2. 20 to 60% by mass of cement, 5 to 50% by mass of a calcium silicate-based lightweight hydrothermal composition obtained by previously hydrothermally synthesizing a calcareous material and a siliceous material, and 3 to 18 reinforcing fibers.
% By weight and a mixture comprising 0 to 60% by weight of a filler is obtained by wet molding, and one or two or more types of green sheets are laminated in a plurality of layers, with a bulk specific gravity of 0.5 to 1.2, bending. Strength 10-30N / mm
Inorganic strength surface material characterized by at ² and walls magnification 2.5 or more. 3. A green sheet layer formed by laminating a plurality of one or more kinds of green sheets, and a net layer
The inorganic load-bearing face material according to claim 2, comprising at least two layers. 4. The calcium silicate-based lightweight hydrothermal composition obtained by previously hydrothermally synthesizing a calcareous raw material and a siliceous raw material has a bulk specific gravity of 0.05 to 0.3.
The inorganic load bearing surface material according to claim 2 or 3. The 5. reinforcing fibers, pulp 3-15 wt% and a Young's modulus 5 kN / mm ² or more fibers is 0-2 wt% and a Young's modulus 5 kN / mm ² less than fibers 0-2
3. The method according to claim 1, wherein
The inorganic load bearing surface material according to claim 3 or 4. 6. Cement: 20 to 60% by mass, 5 to 50% by mass of a calcium silicate-based lightweight hydrothermal composition obtained by previously hydrothermally synthesizing a calcareous material and a siliceous material, and 3 to 18 reinforcing fibers.
A single-layer or multi-layer green sheet obtained by wet molding a composition comprising 1% by mass and 0-60% by mass of a filler
A method for producing an inorganic load-bearing surface material, which is formed by press-molding with a press pressure of ２０20 N / mm ² and then curing. 7. 20 to 60% by mass of cement, 5 to 50% by mass of a calcium silicate-based lightweight hydrothermal composition obtained by preliminarily hydrothermally synthesizing a calcareous material and a siliceous material, and 3 to 18 reinforcing fibers.
A green sheet containing at least one or more net layers as a single layer or a multi-layer formed by wet molding a composition comprising 0% to 60% by mass of a filler and 0 to 60% by mass is used.
^2. A method for producing an inorganic load-bearing surface material, which is formed by press-molding with a press pressure of ² , followed by curing.