JP2003171163A - Hydraulic sheet-manufactured board for floor material, and floor material obtained by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart toughness to the conventional floor or the like by using a hydraulic sheet-manufactured molding as a floor material. <P>SOLUTION: The hydraulic sheet-manufactured board for the floor material is used so as to be made into a stacked matter with a board material consisting of a hydraulic material, which contains also 1 to 10 wt.% reinforcing fiber satisfying the following conditions (1) to (3), and which satisfies the following conditions (4) to (1) the reinforcing fiber consists of polyvinyl alcohol based synthetic fiber; (2) the reinforcing fiber has a denier of 6 to 30 dtex, and a fiber length of 6 to 20 mm; (3) the reinforcing fiber has a strength of ≥100 cN, and an elongation of 5 to 10%; and (4) the bending strength in the fiber orientation direction of the hydraulic sheet-manufactured board for the floor material is ≥30 MPa, also, the bending strength in the direction vertical to the fiber orientation direction is ≥20 MPa, and also, the tensile strength in the fiber orientation direction is ≥10 MPa, tensile elongation is ≥0.5%, and tensile toughness is ≥6 MPa-%. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic papermaking board for flooring, which is used for reinforcing a balcony floor of a building and a floor inside and outside of a building regardless of existing construction.

[0002]

2. Description of the Related Art In recent years, with the increase in the height of buildings, it has become important to reduce the weight of structural materials and floor materials. To reduce the weight of floor materials, high-strength concrete, high-strength mortar and secondary products, lightweight concrete and lightweight mortar, have been proposed. Most of them are aimed at weight reduction, but the present situation is that no proposal has been made for a high-performance floor material that is lightweight and has high toughness. Thinning with high-strength concrete and high-strength mortar for weight reduction reduces the covering thickness of the reinforcing bars, etc., so once cracking occurs due to shock such as an earthquake, vibration or drying shrinkage due to a cooler, etc. There are problems such as further progress of cracking and concrete peeling due to the promotion of neutralization and the generation of rust on reinforcing bars. Further, lightweight concrete and lightweight mortar, which are secondary products, have problems in terms of physical properties such as compression, strength, and Young's modulus lower as they are lighter than conventional concrete and mortar. In the reinforcement of floor materials, it is important to improve the toughness of the floor materials, absorb the energy due to drying shrinkage, the energy of earthquakes, etc. to prevent the floor from cracking and prevent the floor from falling off, and improve the durability. It is necessary. Especially in the repair method, it is meaningless unless the durability is improved.

Although there have been studies on flooring materials in which reinforcing fibers have been added to concrete floors and mortar floors, when the reinforcing fibers are added, the fluidity of concrete decreases and special kneading equipment is required. However, it is very difficult to add fibers to obtain high toughness, resulting in poor workability and high cost.

Current concrete used as flooring material,
Mortars and secondary products such as lightweight concrete and lightweight aerated concrete (ALC) boards are currently not cracked due to drying shrinkage, impact, vibration, load, etc. Since it has a great influence on the deterioration of performance such as appearance, durability and watertightness, it is necessary to establish crack countermeasures. The establishment of this countermeasure against cracking has long been a problem, but due to the complexity of the mechanism of occurrence and the material properties of concrete, a sufficient solution has not been obtained until now. However, in recent years, interest in cracks in concrete, mortar, lightweight concrete as a secondary product, and lightweight mortar has rapidly increased, and cracks are prevented by mixing fibers. However, the fiber-mixed concrete has a low fluidity when the amount of the fiber mixed is large, and it is very difficult to perform construction and molding of a plate material of a secondary product. In addition, although the amount of fibers currently in use is sufficient for preventing cracking and improving toughness, the present situation is insufficient. Especially, it is possible to improve the rigidity, sound insulation and impact resistance while preventing cracks while making the most of the lightweight properties such as ALC and cellular concrete, which are widely used for the weight saving of flooring materials, and the properties such as heat insulation. Is desired.

[0005]

DISCLOSURE OF THE INVENTION In the present invention, a fiber-reinforced hydraulically hardened material obtained by a papermaking method in which a specific amount of a specific reinforcing short fiber is mixed is used alone or in combination as a hydraulic papermaking plate for flooring. As a result, a flooring material having no surface cracks and excellent toughness is provided. Specifically, it proposes a floor material reinforcement method that can achieve improvement in toughness, earthquake resistance, crack prevention, sound insulation, and heat insulation with a reasonable and inexpensive technique, and It is intended to provide a hydraulic papermaking plate for flooring, which absorbs the deformation stress of the cured product and has an excellent finished shape. The hydraulic papermaking board for flooring of the present invention can be applied not only to repair / reinforce existing structures but also to new construction.

[0006]

That is, the present invention is used to form a laminate with a plate made of a hydraulic material,
Moreover, the reinforcing fibers satisfying the conditions 1) to 3) below are 1 to 1
A hydraulic papermaking board for flooring, containing 0% by weight / papermaking board and having a thickness of 6 to 15 mm, which satisfies the following condition 4). 1) The reinforcing fiber is a polyvinyl alcohol-based synthetic fiber, 2) the fineness of the reinforcing fiber is 6 to 30 dtex, and the fiber length is 6
˜20 mm, 3) Strength of the reinforcing fiber is 100 cN or more, and elongation is 5-1.
0) 4) Bending strength in the fiber orientation direction of the hydraulic papermaking board for flooring is 3
0 MPa or more and the bending strength in the direction perpendicular to the fiber orientation direction is 20 MPa or more, the tensile strength in the fiber orientation direction is 10 MPa or more, the tensile elongation is 0.5% or more, and the tensile toughness is 6 MPa-% or more, And, the present invention is preferably a method for producing a laminated floor material in which the hydraulic material before curing is poured onto the upper surface of the hydraulic papermaking plate for flooring material and cured, and more preferably, the hydraulic papermaking material for flooring material. This is a method for producing a laminated floor material in which plates are used for the upper surface and the lower surface, and a hydraulic material before curing is poured between them to cure. The present invention is also a laminated floor material in which the above-mentioned hydraulic papermaking sheet for floor material is laminated on the upper surface, lower surface or both upper and lower surfaces of a plate material made of a hydraulic material.

Polyvinyl alcohol (hereinafter abbreviated as PVA) -based synthetic fibers are used as the reinforcing fibers constituting the hydraulic papermaking board for flooring of the present invention. PV used in the present invention
The A-based synthetic fiber must be a fiber having a specific dimension, strength and elongation. That is, the PVA synthetic fiber used in the present invention has a fineness of 6 to 30 dtex, a fiber length of 6 to 20 mm, a strength of 100 cN or more, and an elongation of 5 to 10.
Must be%. When the fineness of the PVA-based synthetic fiber used is smaller than 6 dtex, the fiber content must be secured higher than usual, and thus fiber balls are likely to be generated in the papermaking slurry, and the papermaking property is rapidly deteriorated. On the other hand, if it exceeds 30 dtex, the amount of drainage increases and the cement particles become unfixed. Preferably 7
It is in the range of up to 15 dtex.

The fiber length is closely and complexly related to the fineness, strength and strength, but the range of 6 to 20 mm is in view of the paper-making property of the hydraulic papermaking plate for flooring and the reinforcing property of the hydraulic papermaking plate for flooring. Used. If the length is shorter than 6 mm, the fibers are more likely to come off when the papermaking plate is broken, and the bending strength and the tensile strength are reduced. On the contrary, when the length is longer than 20 mm, the fibers are easily entangled with each other during the papermaking, causing flocs and degrading the papermaking property. It is preferably 8 to 12 mm. Regarding the relationship with the fineness, it is preferable to increase the fiber length as the fineness increases.

The fiber strength (tensile breaking strength per fiber) must be 100 cN or more. This is the process of breaking the hydraulic papermaking plate for flooring, where the frictional force between the fiber and the matrix acts as a tensile force on the fiber, but the strength required to slip the fiber against the tensile force without breaking easily. Is. In particular, the PVA-based synthetic fiber of the present invention has a characteristic that the frictional force gradually increases when slipping because it has good adhesion to cement, and therefore it is required to have high strength. When the strength is less than 100 cN, the fibers are easily broken, and the hydraulic papermaking board for flooring lacks in toughness. It is preferably 110 cN or more. Looking at the relationship with the fineness, for example, a strength of 100 cN at 6 dtex
Strength of about 17cN / dtex or more, 10d
In tex, 10 cN / dtex or more, 30 dte
In x, about 3.3 cN / dtex or more is required.

The elongation of the fiber is preferably in the range of 5% or more and 10% or less in order to facilitate slipping as described above. If the elongation is less than 5%, the fibers are likely to break, and conversely, if the elongation is more than 10%, the elastic modulus of the fibers decreases, and the breaking strength of the hydraulic papermaking board for flooring decreases.
It is preferably 6 to 9%.

When the PVA-based synthetic fiber used in the present invention is produced, it is preferable to produce the fiber by wet spinning or dry-wet spinning from the viewpoints of production processability, cost and the like.
Specifically, it is preferable to use the method for producing a PVA-based synthetic fiber described in JP-A-2000-053455.

The conditions for the PVA-based synthetic fiber used as the reinforcing fiber correspond to the unique composition that does not contain sand in the papermaking cement board and the matrix component obtained as a result of the processing method in which high-pressure pressing is performed before curing. That is, the interaction between the matrix and the reinforcing fibers (friction resistance, pull-out resistance) brings about the maximum reinforcing effect when the conditions of the reinforcing fibers are preferably maintained within the above range. PVA of the present invention
The content of the synthetic fibers is preferably 1 to 10% by weight / papermaking plate. If the content of the fiber is less than 1% by weight / papermaking plate, the toughness is insufficient, and conversely, if it exceeds 10% by weight / papermaking plate, the dispersibility of the fiber becomes extremely poor and the papermaking property deteriorates.
It is preferably 2.5 to 5% by weight / papermaking plate.

The thickness of the papermaking board using the PVA synthetic fiber of the present invention used as a hydraulic papermaking board for flooring is 6 to 15
mm. If the thickness is less than 6 mm, for example, when used as a substitute for deck plates and when placing concrete etc., the weight of the concrete tends to cause bending, and in order to prevent it, it is necessary to take measures to make the support work dense. And the floor reinforcing effect is reduced. On the contrary, when the thickness is thicker than 15 mm, the cost becomes high. It is preferably 6 to 12 mm. The hydraulic papermaking board for flooring of the present invention enables construction by relatively simple supporting work and, at the same time, has good durability and thus prevents deterioration of the floor body for a long period of time. Furthermore, it becomes possible to reinforce the floor body by strengthening its toughness. For example, an earthquake or continuous vibration causes cracks in the structure, and then the crack width gradually increases and stress concentration causes destruction, but in the case of the present invention, there are many extremely fine microcracks in the hydraulic papermaking board for flooring. It can be expected to prolong the life of the structure by absorbing energy as it is generated and greatly delaying the generation of cracks in the internal body. Further, for example, when used in combination with lightweight concrete, ALC, etc., the effect of reinforcing and toughness is particularly large, and the effect of improving heat insulating property, sound insulating property, and sound insulating property is also obtained.

Further, in the papermaking board, the fibers are easily oriented and exhibit a high bending strength in the fiber orientation direction, that is, the maximum bending strength, but in order to be used as the hydraulic papermaking board for flooring of the present invention, the fiber orientation direction is The bending strength in the vertical direction and the minimum bending strength are also required to some extent. In the hydraulic papermaking sheet for flooring of the present invention, the bending strength in the fiber orientation direction, that is, the maximum bending strength is required to be 30 MPa or more, preferably 40 MPa or more. On the other hand, the bending strength in the direction perpendicular to the fiber orientation direction, that is, the minimum bending strength becomes relatively small, but 20 MPa or more is necessary, and preferably 30 MPa or more. If the minimum bending strength is less than 20 MPa, the effect of reinforcing toughness is reduced, which is not preferable. Further, the hydraulic papermaking sheet for flooring using the PVA-based synthetic fibers described above exhibits high elongation and high tensile toughness in the fiber orientation direction, which are not present in conventional materials. The effect of protecting from. Specifically, this effect is sufficiently obtained when the tensile strength in the fiber orientation direction in the hydraulic papermaking board for flooring is 1
0 MPa or more, preferably 12 MPa or more, elongation is 0.5% or more, preferably 1.0% or more, and tensile toughness is 6 MPa-% or more, preferably 8 MP.
It is a-% or more. The tensile toughness can be obtained from the area surrounded by the maximum tensile strength, the breaking elongation and the base axis from the tensile strength-elongation curve.

As the hydraulic papermaking board for flooring of the present invention, a forming board by a papermaking method is used. In the papermaking, a porridge-like product obtained by suspending cement particles and the like in an aqueous medium is filtered into a mesh and molded. In the process, a thin film is laminated one after another to form a molded plate with a desired thickness. A round net method (haschek method), a long net method, or one or several times using a concentrated suspension, to a certain extent. There is a flow-on method to secure the thickness of the. The paper-making method is mechanically continuous and mass-produced in a batch method, and has an advantage that uniform and stable performance can be obtained. Further, the sheet thickness is 2 to 30 mm, more generally 4 to 20 mm, and the plate thickness is relatively thin. The material can be manufactured. The production of such a thin plate is extremely difficult by ordinary mortar casting other than papermaking.

The forming plate which is the hydraulic papermaking plate for flooring of the present invention is manufactured by the method such as the round net, the Fourdrinth, and the flow-on as described above. The material composition is a hydraulic material, a reinforcing fiber, Other additives and the like. The method for preparing the slurry is not particularly limited, but from the viewpoint of obtaining a slurry in which the solid components are uniformly dispersed, the pulp is put into a stirrer filled with water and stirred, and then a reinforcing fiber, a hydraulic material, and the like. Additives (inorganic substances, etc.) are preferably added sequentially. In the present invention, Portland cement is preferably used as the hydraulic material. As described above, the PVA-based synthetic fiber of the present invention is used as the reinforcing fiber. As other additives, blast furnace slag, fly ash, calcium carbonate, silica fume, sepiolite, attapulgite, mica, wollastonite and other inorganic substances are preferably used. These are effects that improve the physical properties of hydraulic papermaking sheets for flooring, such as improvement of freeze-thaw resistance, suppression of intrusion of corrosive substances (chlorine, carbon dioxide, various organic acids such as sulfate ion), reinforcement fiber and matrix Improvement of adhesion, effect of adjusting the viscosity of suspension appropriately to increase papermaking efficiency, effect of controlling drying shrinkage of a paper product that is a hydraulic papermaking plate for flooring, and improvement of strength of hydraulic papermaking plate for flooring The effect will appear. In particular, silica fume, sepiolite, attapulgite, etc. are suitable for the present invention because they are materials that bring about the effect of appropriately adjusting the viscosity of the suspension to increase the papermaking efficiency.

In the present invention, it is preferable to use beaten pulp as the organic fiber. The beating pulp preferably has a beating degree of CSF value of 70 to 130 ml. The amount of these pulps used is preferably 2 to 6% by weight, more preferably 3 to 4% by weight, based on the hydraulic material. If the amount used is less than 2% by weight, especially in the gauze method, the cement particles in the suspension will be insufficiently captured, making it difficult for the cement particles to be filtered out, resulting in poor papermaking efficiency and at the same time in the papermaking product. The cement mixing ratio of No. 1 is decreased, and the strength performance of the hydraulic papermaking plate for flooring is decreased. On the other hand, if the amount of pulp used exceeds 6% by weight, the water resistance of the hydraulic papermaking board for flooring and the effect of suppressing intrusion of corrosive substances (various organic acids such as chlorine, carbon dioxide, and sulfate ions) are impaired.

The hydraulic papermaking board for flooring made of a papermaking product using the PVA-based synthetic fiber of the present invention has excellent strength and toughness. For example, when the maximum bending strength in the bending standard test method is P (MPa) and the bending at that time is δ (cm), the conventional reinforced paper sheet for flooring made of asbestos and the conventional PVA-based synthetic fiber are 1. 5% by weight / so-called papermaking plate for so-called non-asbestos flooring is P × δ
Is about 10 and more powerful than the conventional one,
2% by weight of PVA-based synthetic fiber having a strength of less than 100 cN /
Even in the case of a high-strength flooring papermaking plate using a papermaking plate, Pxδ is limited to about 25, and in that case as well, the deflection is less than 1 cm, whereas the PVA-based synthetic fiber of the present invention was used. In this case, it is possible to easily obtain a papermaking plate for flooring having excellent toughness and having P × δ of more than 30 and bending of more than 1 cm. The uniaxial tensile standard test method has a breaking elongation of 10 to 15 MP.
a, the elongation is 0.5% or more. Conventional product has an elongation of 0.0
It is about 1%.

The hydraulic papermaking board for flooring obtained in the present invention is
Since the member is thin and lightweight, the weight of the structure can be reduced. The hydraulic papermaking sheet for flooring can be manufactured with a thickness of 6 mm, and a maximum of 15 mm is possible.

The following three methods are typical examples of the method of constructing a floor of a building using the hydraulic papermaking board for flooring of the present invention. (1) A method of fixing the deck plate to the upper part of the beam and pouring concrete and mortar on it to construct the floor. The hydraulic papermaking plate of the present invention is used as a substitute for a deck plate. (2) The hydraulic papermaking plate of the present invention is fixed to the upper part of the beam, and supporting work is performed if necessary. Concrete, mortar is poured on the upper surface of the hydraulic papermaking plate, and further the concrete,
A method of laying the hydraulic papermaking plate of the present invention on mortar. (3) Hydraulic plate material (for example, secondary product ALC,
When using lightweight mortar, concrete board, etc.,
Laminating the hydraulic papermaking board for flooring of the present invention and the hydraulic board,
The method of laying on the top of the beam.

In the construction method of the above (1), when the hydraulic papermaking plate of the present invention is used, for example, it is obtained by applying a cement adhesive to the placing surface of concrete or mortar and then flowing concrete or mortar to construct. A laminated flooring material is preferably used. As the cement adhesive, for example, an ethylene vinyl acetate copolymer emulsion type adhesive is preferably used.

In the case of the above-mentioned construction method (2), the cement adhesive is applied to the concrete placing surface of the hydraulic papermaking plate of the present invention, and then concrete and mortar are placed. A laminated floor material obtained by laying a hydraulic papermaking plate coated with the above cement adhesive on the upper part of the concrete and mortar after setting and hardening and then laminating and integrating them in a sandwich is preferably used.

Further, in the case of the construction method of the above (3), particularly in the case of a lightweight plate material such as ALC, cracks or the like are caused by concentrated load or impact load, and therefore the water of the present invention is used to disperse these loads. A rigid papermaking plate, the upper surface of a plate material made of a hydraulic material using an epoxy resin or other adhesive,
A method in which a laminated floor material laminated on the lower surface or both upper and lower surfaces is spread over the beam and used is preferably used.

The flooring material using the hydraulic papermaking board containing the PVA-based synthetic fiber of the present invention as the reinforcing fiber is the conventional PVA.
Compared with a flooring material using a hydraulic papermaking plate containing a synthetic fiber as a reinforcing fiber, it has an effect of improving bending properties, particularly bending toughness, exhibits extremely good toughness, and improves brittleness of concrete.

[0025]

The present invention will be described with reference to the following examples.
The present invention is not limited to these examples. In the present invention, the fiber fineness, the fiber strength, the fiber strength, the fiber elongation, the drainage of the beaten pulp, the maximum bending strength (P) of the molded product, the flexure (δ) indicating the maximum bending strength P, the tensile strength, and the tensile elongation. Degree and tensile toughness mean those measured by the following measuring methods.

[Fineness dtex] The weight of a fixed sample length of the obtained fibrous material was measured to measure the apparent fineness at n = 5 or more, and the average value was obtained. In addition, the thing whose fineness cannot be measured by the weight measurement of a fixed yarn length (fine denier fiber) was measured with the vibroscope.

[Fiber strength cN, strength cN / dtex,
Elongation%] After preliminarily leaving the fibers in an atmosphere of a temperature of 20 ° C. and a relative humidity of 65% for 24 hours to adjust the humidity, single fibers are set to have a test length of 10 cm and a pulling speed of 5 cm / min, and the Instron tester “Shimadzu The fiber strength was measured by "Autograph", and the strength was calculated by dividing the strength by the fineness. The elongation was calculated by breaking the single fiber (cm) / holding length (cm) × 100. When the fiber length is shorter than 10 cm, the maximum length of the sample in the possible range is measured as the gripping length.

[Freeness (CSF) ml] Pulp freeness test method Measured according to the Canadian Standard Model of JIS P8121-1976, slurry concentration 0.4 wt%, temperature 2
The average value corrected to 0 ° C. was evaluated as CSF.

[Maximum bending strength (P1) MPa, minimum bending strength (P2), maximum bending strength P1 indicating flexure (δ)
cm] The hydraulic material slurry is used to produce a standard molded body by the standard paper-making method described below, and the standard molded body is wrapped in a polyethylene sheet for 50 minutes.
Pre-cured for 24 hours at ℃ and saturated humidity, then 20
A specimen aged 28 days after curing at 27 ° C and saturated humidity for 28 days was cut into a rectangle with a width of 45 mm and a length of 220 mm, and the humidity was adjusted by leaving it in a room at 20 ° C and 65 RH% for 7 days. A bending test is performed by the equal point bending test, the bending stress when the maximum load is generated is the bending strength, the bending strength in the fiber orientation direction is the maximum bending strength P1, the bending strength in the direction perpendicular to the fiber orientation direction is the minimum bending strength P2, The deflection showing the maximum bending strength P1 in the load-deflection curve was evaluated as δ. Standard papermaking method: 14 papermaking sheets are wound on a making roller so that the thickness after curing and humidity control is 7 mm ± 0.5 mm after being molded by the cylinder net method by Haschek, and pressed by pressing at 5 MPa. To do. Bending test: Equipment Shimadzu Autograph AG5000-B Sample width 45 mm, thickness 7 mm, length 220 mm cut out with the papermaking direction as the length direction Test speed (loading head speed) 2 mm / min. Bending span 18 cm

[Standard Tensile Test Method] A plate having a thickness of 7 mm is made into paper and cured by the same method as described above. 40m width from the papermaking board
A sample of m and a length of 330 mm is cut out and subjected to humidity control. Tensile test: Device Instron 5566 (manufactured by Shimadzu Corporation) Sample Width 40 mm, thickness 7 mm, length 330 mm cut out with the papermaking direction as the length direction Gripping length 200 mm Test speed 0.5 mm / min The test was performed, and the maximum tensile strength and the tensile toughness at the maximum tensile strength were obtained.

[Examples 1 to 4 and Comparative Examples 1 and 2] 500 liters of water was put into a preliminary stirrer to stir the stirrer, and 1.5 kg of softwood pulp (CSF 100 ml) (3% by weight in solid content). Added, then 87-89% by weight cement, 5% by weight silica fume, 1% by weight sepiolite
Was sequentially added, and finally 2 to 4% by weight of PVA-based synthetic fiber under the conditions shown in Table 1 was added, and after stirring, a slurry having a concentration of 10% by weight was transferred to a chest. Next, the slurry was supplied from the feed tank to the gauze portion, the concentration was adjusted to 5% by weight with dilution water (white water), and papermaking was performed using a Mini-Hascheck machine. The obtained sheet 15
Approximately 17 sheets are wound on a making roller, pressed and squeezed at a pressure of 5 MPa, and wrapped in a polyethylene sheet 50
Aged at ℃ and saturated humidity for 24 hours, then at 20 ℃,
The humidity was controlled in an open state under an environment of saturated humidity. The obtained molded product has a thickness of 6.8 to 7.2 mm and a density of 1.62.
The papermaking plate for flooring was a slate plate of 1.68 g / cm ³ . Table 2 shows the performance of the papermaking plate for flooring. Ordinary cement is "Chichibu Onoda Ordinary Portland Cement", and silica fume is Elchem 9 "Elchem 9".
40U ", sepiolite is" Milcon S "manufactured by Showa Kogyo Co., Ltd.
S "was used. The types and amounts of the reinforcing fibers and other materials are listed in Table 2 together with the physical properties of the flooring papermaking board.

[0032]

[Table 1]

[0033]

[Table 2]

The sheets of Examples 1 to 4 and Comparative Examples 1 to 3 (width 50 cm, length 100 cm) were aged at 50 ° C. for 24 hours under saturated humidity conditions, and then at 20 ° C. for 27 days under saturated humidity conditions. 100mm x 4 from the one cured below
Cut out a rectangle of 00 mm, 100 mm x 100 mm
It is laid on the bottom of a 400 mm iron formwork, and cement adhesive (Nippon Kasei Co., Ltd. "NS High Flex HF-1
000 ") and then poured concrete from above with the formulation of Table 3. In addition, as Comparative Example 3, only the concrete having the composition of Table 3 was poured without a sheet, 24
After a lapse of time, it was demolded and cured in water for 27 days to prepare a floor material. Using a Shimadzu universal testing machine, arrange this so that the papermaking plate is at the bottom of the test piece, and make a span of 300 mm, and perform a three-part bending test to determine the bending load, bending deflection, and bending toughness after cracking. It was measured. The results are shown in Table 4.

As shown in Table 4, the laminated flooring material using the sheets of Examples 1 to 4 is the flooring material prepared by not laminating the laminated flooring material using the sheets of Comparative Examples 1 and 2 or the sheet of Comparative Example 3. It can be seen that the bending toughness value is higher than that of the material, that is, excellent toughness is exhibited.

[0036]

[Table 3]

[0037]

[Table 4]

[0038]

INDUSTRIAL APPLICABILITY The hydraulic papermaking plate for flooring material containing the PVA synthetic fiber of the present invention as the reinforcing fiber has a bending strength higher than that of the conventional hydraulic papermaking sheet for flooring containing the PVA synthetic fiber as the reinforcing fiber. Excellent in bending toughness (flexure), tensile strength, tensile elongation and tensile toughness. Further, the flooring material using the hydraulic papermaking plate for flooring material of the present invention has a high bending toughness value, exhibits extremely good toughness, and improves brittleness of concrete. Therefore, when the hydraulic papermaking plate for flooring of the present invention is used in combination, it largely contributes to the increase in strength of the conventional floor, particularly to the improvement of toughness.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) (C04B 28/04 C04B 16:06 B 16:06 E) 111: 60 111: 60 (72) Inventor Hamada Toshihiro 1-2-1 Kaigandori, Okayama City, Okayama Prefecture F-term in Kuraray Co., Ltd. (reference) 2E162 CA01 CA11 CA13 FD06 4G012 PA06 PA08 PA22 PA24 PA29 PB04 PC11 PC12 PE04 4L055 AA02 AF21 AG04 AG99 AH01 AH37 BE14 BF02 EA07 EA08 EA08 FA13 FA23 FA30 GA23 GA24 GA38

Claims (4)

[Claims] 1. A reinforcing fiber which is used as a laminate with a plate material made of a hydraulic material and which satisfies the conditions 1) to 3) below is contained in an amount of 1 to 10% by weight / papermaking plate and the following 4 )
A hydraulic papermaking board for a flooring material having a thickness of 6 to 15 mm which satisfies the above condition. 1) The reinforcing fiber is a polyvinyl alcohol-based synthetic fiber, 2) the fineness of the reinforcing fiber is 6 to 30 dtex, and the fiber length is 6
˜20 mm, 3) Strength of the reinforcing fiber is 100 cN or more, and elongation is 5-1.
0) 4) Bending strength in the fiber orientation direction of the hydraulic papermaking board for flooring is 3
0 MPa or more and the bending strength in the direction perpendicular to the fiber orientation direction is 20 MPa or more, the tensile strength in the fiber orientation direction is 10 MPa or more, the tensile elongation is 0.5% or more, and the tensile toughness is 6 MPa-% or more, 2. A method for producing a laminated floor material, wherein the hydraulic papermaking plate for flooring according to claim 1 is used as an alternative to a deck plate, and a hydraulic material before curing is poured onto the upper surface of the deck plate and cured. 3. The hydraulic papermaking plate for flooring according to claim 1,
A method for producing a laminated flooring material, which is used for a lower surface, in which a hydraulic material before curing is poured and cured. 4. A laminated floor material in which the hydraulic papermaking sheet for floor material according to claim 1 is laminated on the upper surface, the lower surface or both upper and lower surfaces of a plate material made of a hydraulic material.