JP2003213839A - Fiber-reinforced inorganic plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nearly smooth fiber-reinforced inorganic plate in which fine rugged shape with a nonslip effect in handling during construction is provided on at least one face out of the front and rear faces without impairing the appearance or strength of the fiber-reinforced inorganic plate itself. <P>SOLUTION: This fiber-reinforced inorganic plate has the rugged part at least on one face out of the front and rear faces. In the rugged part, the height difference between a recessed part and a projecting part is 0.1-2 mm, and the pitch between the adjacent projecting parts is within the range of 0.1-3 mm. The area ratio of the projecting parts to the whole rugged part is 20-70%, and the coefficient of static friction is 0.8 or more. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention provides a non-slip effect in handling without impairing the aesthetic appearance of the product surface by imparting a substantially uniform and fine uneven shape to at least one surface of the fiber-reinforced inorganic plate. The present invention relates to a fiber-reinforced inorganic plate having the same.

[0002]

2. Description of the Related Art Fiber-reinforced inorganic boards currently used as general building materials include, for example, cement-based, gypsum-based,
Materials such as calcium silicate are available. These fiber-reinforced inorganic plates are usually manufactured by a method such as a papermaking method and a press molding method, and examples of the fiber-reinforced inorganic plate and a method for manufacturing the fiber-reinforced inorganic plate are disclosed in Japanese Patent Publication No. 25182/1996.
No. 001-48630, Japanese Patent Publication No. 7-35289, etc. are proposed.

Here, Japanese Patent Publication No. 25182/1996 discloses cellulose pulp, synthetic pulp, glass fiber, PV.
A fibrous raw material selected from the group consisting of A fiber, PAN fiber, aramid fiber and carbon fiber, and a powder raw material for matrix formation mainly composed of Portland cement or mainly calcareous raw material and siliceous raw material In the method for producing a non-asbestos slate consisting of wet-mixing the constituent raw materials as the components and stacking a plurality of green plates formed by the papermaking method, and then curing and curing, a raw plate containing water before press molding There is described a method for producing non-asbestos slate, characterized in that the rate is 33% or more and the reduction rate of the green plate water content by press forming is 10% or more. Further, in JP 2001-48630 A, 20 to 60% by mass of cement, 5 to 50% by mass of calcium silicate-based lightweight hydrothermal compound obtained by hydrothermally synthesizing calcareous raw material and siliceous raw material in advance, reinforcing fiber 3-18% by mass
And a filler comprising 0 to 60 mass% are obtained by wet molding, and have a bulk specific gravity of 0.5 to 1.2 and a bending strength of 10
An inorganic load bearing surface material is disclosed, which has a wall strength of 30 N / mm ² and a wall magnification of 2.5 or more. Further, Japanese Patent Publication No. 7-35289 discloses a type II anhydrous gypsum 98-
100 parts by weight of a mixture of 60% by weight (mass%) and 2-40% by weight of short fibers (mass%), 5 to 100 parts by weight of inorganic powder (mass part), and 100 parts by weight of the above-mentioned type II anhydrous gypsum. Addition ratio to 0.1 parts (parts by mass) is 0.1
To 2.5 parts by weight (mass part) of a gypsum hardening accelerator is made into a slurry having a water temperature of 20 to 35 ° C., and the slurry is subjected to paper forming, and then pressure-molded at a pressure of 1 to 400 kg / cm ^2. To obtain a papermaking plate, and the papermaking plate is at a temperature of 0 to 15 ° C.
Disclosed is a method for producing an anhydrous gypsum papermaking board, which comprises cooling and curing in an atmosphere having a humidity of 70 to 100%.

Of these fiber-reinforced inorganic plates, most of them, except the decorative plate whose surface is previously coated, are directly applied to all parts of the building, and in some cases, the surface of the fiber-reinforced inorganic plate is It may remain exposed. At this time, it is preferable for the user that the surface of the fiber-reinforced inorganic plate is finished to be substantially smooth, if possible, and fine polishing is often performed. However, when a builder carries the fiber reinforced inorganic plate at the construction site of the fiber reinforced inorganic plate, a smooth surface may cause slipperiness, and a material having a large mass may cause a difficulty in handling.

On the other hand, a fiber-reinforced inorganic sheet having a finish with a large and rough texture or dent on the surface is excellent in handling property but loses uniformity, so that the surface is not dense and the fiber-reinforced inorganic sheet is not. Since the density of the board is insufficient, the strength of the fiber-reinforced inorganic board is insufficient and the value as a building material is lost.

[0006]

DISCLOSURE OF THE INVENTION According to the present invention, at least one of the front and back surfaces is provided with a fine uneven shape having a non-slip effect during handling during construction without impairing the appearance or strength of the fiber-reinforced inorganic plate itself. An object is to provide a fiber-reinforced inorganic plate that is substantially smooth.

[0007]

That is, in the fiber-reinforced inorganic plate of the present invention, the height difference between the concave portion and the convex portion is 0.1 to 2 mm on at least one of the front and back surfaces, and the pitch between adjacent convex portions is Having an uneven portion within the range of 0.1 to 3 mm, the area ratio of the convex portion to the entire uneven portion is 20 to 70%,
In addition, the coefficient of static friction is 0.8 or more.

The fiber-reinforced inorganic board of the present invention is characterized by being a fiber-reinforced cement board, a fiber-reinforced calcium silicate board or a fiber-reinforced gypsum board.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The fiber-reinforced inorganic plate of the present invention has a height difference of 0.1 to 0.1 on at least one of the front and back surfaces.
2 mm, and the pitch between adjacent protrusions is 0.1 to 3
It is characterized in that it has an uneven portion within a range of mm, the area ratio of the convex portion to the entire uneven portion is 20 to 70%, and the coefficient of static friction is 0.8 or more.

Here, the term "fiber-reinforced inorganic board" described in the present specification refers to, for example, a fiber-reinforced cement board, a fiber-reinforced calcium silicate board, a fiber-reinforced gypsum board and the like which are generally used as building materials at present. Are collectively referred to, and the component blending, manufacturing history, and the like are not particularly limited. For example, a fiber-reinforced cement board uses cement and reinforcing fibers as a main material as a binder, and optionally an inorganic aggregate, an inorganic filler, and the like, and a known method such as a papermaking method or a pressure dehydration molding method. It is manufactured by curing and curing the green sheet molded in. Further, the fiber-reinforced calcium silicate plate, using a matrix-forming raw material such as calcareous raw material and siliceous raw material and reinforcing fibers as the main raw material, if necessary, in combination with inorganic aggregate, inorganic filler, etc.,
It is produced by curing a green sheet formed by a known method such as a papermaking method or a pressure dehydration forming method by hydrothermal reaction. Furthermore, the fiber-reinforced gypsum board uses hydrated gypsum such as hemihydrate gypsum or anhydrous gypsum as a binder and reinforcing fibers as main raw materials, and, like the cement board and calcium silicate board described above, if necessary. It is manufactured by curing and curing a green sheet molded by a known method such as a papermaking method or a pressure dehydration molding method, in which an inorganic aggregate and an inorganic filler are used together. If necessary, a curing retarder or curing accelerator may be added.

The term "static friction coefficient" described in the present specification is obtained by the following method: First, a fiber-reinforced inorganic plate is placed in a normal environment with the surface having the irregularities facing up. Rubber hardness of 40 mm, 100 mm x 100 mm x 3 mm, fixed horizontally and pulled horizontally on top of it
A rubber sheet having a dimension of (thickness) is placed, and a steel weight (mass: Wkg) having a bottom surface having the same shape as the rubber sheet is placed on the rubber sheet, and the rubber sheet is placed in the horizontal direction. Maximum force F (N) required to pull and start moving
Is calculated, and the gravitational acceleration is set to 9.8 (m / sec ² ), and the static friction coefficient μ is calculated by the following equation.

## EQU1 ## μ = F / (9.8W) (1) However, W is in the range of 20 to 30 kg.

According to the research conducted by the present inventors, in the fiber-reinforced inorganic sheet of the present invention, if the coefficient of static friction is 0.8 or more, preferably 0.85 or more, handling at the time of construction of the fiber-reinforced inorganic sheet, etc. It turns out that the problem in can be solved.

The fiber-reinforced inorganic plate of the present invention has an uneven portion on at least one of its front and back surfaces, and the height difference between the concave portion and the convex portion is 0.1 to 2 mm, preferably 0.5 to.
Within the range of 1.5 mm. If the height difference between the concave portion and the convex portion is out of the above range, the coefficient of static friction of the fiber-reinforced inorganic plate cannot be 0.8 or more, and it becomes slippery, which is not preferable. Further, when the height difference between the concave portion and the convex portion exceeds 2 mm, the appearance of the fiber-reinforced inorganic plate is not smooth, and rather, it is close to the unevenness as a pattern, and the substantially smooth fiber-reinforced inorganic plate which is the object of the present invention. Not only is it not desirable because the unevenness increases the meaning of the design, and the unevenness easily causes chipping or rubbing of the convexity depending on the material strength, deterioration of the appearance during handling, and fiber. It is not preferable because it may cause deterioration of the reinforcing inorganic plate itself.

Further, in the uneven portion, the pitch between adjacent convex portions is in the range of 0.1 to 3 mm, preferably 0.5 to 3 mm. Here, if the pitch between the adjacent convex portions exceeds 3 mm, the contact area when gripping the fiber-reinforced inorganic plate is decreased conversely, and as a result, the frictional force becomes insufficient and slipping is unfavorable. In addition, the pitch between adjacent convex portions is 0.1 mm
If it is less than the above range, the unevenness becomes too fine, the coefficient of static friction decreases, and the anti-slip effect is obtained, which is not preferable. In addition, the pitch between adjacent convex portions means between the apex of the convex portions or between the center points of the upper surfaces of the convex portions.

Further, the area ratio of the projections to the entire projections and depressions is in the range of 20 to 70%, preferably 30 to 60%. Here, if the area ratio of the projections to the entire projections and depressions is outside this range, the projections and depressions are in a nearly smooth state, the coefficient of static friction is less than 0.8, and the anti-slip effect becomes insufficient. Not good for

The irregularities can be provided by applying a drainage cloth or a perforated sheet to at least one of the front and back surfaces of the fiber-reinforced inorganic plate, and preferably from both the front and back surfaces for the purpose of purpose. It is preferable.

The fiber-reinforced inorganic plate of the present invention having the above-mentioned uneven portion can be manufactured, for example, by the following method. That is, when the fiber-reinforced inorganic plate is manufactured by a papermaking method, a pressure dehydration molding method, a casting method, or the like,
In the dehydration or primary curing step, by using a drainage cloth or a perforated sheet on at least one of the front and back surfaces of the green sheet of the fiber reinforced inorganic plate, at least one of the front and back surfaces of the fiber reinforced inorganic plate is substantially uniform and fine. It is possible to give an uneven shape.

The drainage cloth or perforated sheet referred to in the present specification is intended to filter solids and extract excess water. As the woven cloth, generally, there are many woven cloths and wire meshes in which fibers are woven, and the weaving method is not particularly limited, and a general shape can be used. For example, a woven fabric woven by a weaving method such as a plain weave, a twill weave, a twill weave, a satin weave, a twill weave, and a double weave can be used.

The materials are polyester, nylon,
Organic synthetic fibers such as polypropylene, polyvinyl alcohol, polyacrylonitrile and Kevlar, inorganic artificial fibers such as carbon fibers and metal fibers can be used. In addition to the woven fabric, a porous sheet, a perforated steel plate or the like can be used.

Using the above-mentioned drainage cloth or perforated sheet, the uneven shape imparted to at least one of the front and back surfaces of the green sheet of the fiber reinforced inorganic plate has fine openings in the drainage cloth or perforated sheet. As a result, the material structure of the fiber-reinforced inorganic plate is retained, and after the water is squeezed, it has a fine, substantially protruding shape. This projection group increases the frictional force when the operator manually lifts up the inorganic plate, and it is possible to carry it relatively easily without requiring more pressure than necessary.

Thus, while maintaining the physical properties required as a building material for the fiber-reinforced inorganic board, a filtering cloth or a perforated sheet can be applied to at least one of the front and back surfaces to give a fine and substantially uniform uneven shape, This can improve the workability of the builder in handling the inorganic plate.

[0022]

The present invention will be described in more detail with reference to the following examples. Example 1 Ordinary Portland cement, reinforcing fibers (wood pulp, polyvinyl alcohol fibers), calcium silicate hydrate and inorganic fillers (calcium carbonate, wollastonite) were mixed with water in the proportions shown in Table 1 to prepare a raw material slurry. Made into a dehydrated raw material film using a papermaking machine
A 6 mm green sheet was prepared. 1820 mm by applying a predetermined drainage sheet (filtering cloth, wire mesh) to the front and back surfaces of this green sheet, pressurizing and dehydrating with a pressure of 8 N / mm ² , and then curing by steam curing and natural curing. A fiber-reinforced inorganic plate having a size of 910 mm and a thickness of 10 mm was obtained.

The physical properties of the obtained fiber-reinforced inorganic plate and the uneven shape transferred to the front and back surfaces were evaluated and confirmed. The obtained results are also shown in Table 1. The average height of the convex portions and the average pitch between the adjacent convex portions are obtained by actually measuring 10 points of arbitrarily selected portions with a low magnification microscope. The coefficient of static friction is the result of measurement with the weight (W) mass of 25 kg in the above formula 1. The appearance is judged to be such that the concavo-convex pattern is not conspicuous when viewed at a distance of about 60 cm, the entire surface is uniform, and there is no unevenness.
It is evaluated in two grades, "good (○)" and "bad (x)". The handling property is evaluated on the basis of two grades, "good (○)" for easy carrying when carrying an inorganic plate by hand, and "poor (x)" for more slippery when more grip is required.

[0024]

[Table 1]

The materials, textures and openings of the drainage sheets used in the examples are as shown in Table 2 below:

[0026]

[Table 2]

The comparative product 1 was obtained by pressure dehydration molding without using a draining sheet between the green sheet and the template, and the surface of the fiber reinforced inorganic plate obtained by this was Although it became a surface without fine irregularities, the coefficient of static friction was reduced, it lacked in handleability, and unevenness, wrinkles, undulations, etc., when viewed as a whole, also occurred partially, which is not desirable as an appearance. It became a thing. Further, Comparative product 2 uses a wire mesh as a sheet for drainage, but the mesh of the wire mesh is large, the mesh pattern is notable and the appearance is impaired, and the convex portion is flat and large so that static friction The coefficient was low and the handling property was poor.

Example 2 Other than using slaked lime, powdered silica stone, reinforcing fiber (wood pulp, polyvinyl alcohol fiber), calcium silicate hydrate and inorganic filler (calcium carbonate, wollastonite) shown in Table 3 as raw materials In the same manner as in Example 1 above, a fiber-reinforced inorganic plate was obtained. Table 3 also shows various properties of the obtained fiber-reinforced inorganic plate.

[0029]

[Table 3]

Example 3 A fiber-reinforced inorganic plate was obtained in the same manner as in Example 1 except that anhydrous lime, powdered silica stone, and reinforcing fibers (wood pulp, polyvinyl alcohol fiber) shown in Table 4 were used as raw materials. Various properties of the obtained fiber-reinforced inorganic plate Table 4
Also described in.

[0031]

[Table 4]

[0032]

EFFECTS OF THE INVENTION According to the present invention, it is possible to provide a fiber-reinforced inorganic plate having improved handling properties during construction without impairing the appearance or strength of the fiber-reinforced inorganic plate itself.

Continued front page    (72) Inventor Takeharu Harasawa             4-23-22 Edogawa, Edogawa-ku, Tokyo (72) Inventor Tomoki Iwanaga             4-13-2 Tokodai, Ishioka City, Ibaraki Prefecture F-term (reference) 2E162 CA06 CA16 CA21 FA01 FA04                       FA20 FB07 FC01 FD06

Claims (2)

[Claims] 1. In the fiber-reinforced inorganic plate, the height difference between recesses and protrusions on at least one of the front and back surfaces is 0.1 to 2 mm, and the pitch between adjacent protrusions is in the range of 0.1 to 3 mm. It has a certain uneven portion, the area ratio of the convex portion to the entire uneven portion is 20 to 70%, and the coefficient of static friction is 0.8.
The fiber-reinforced inorganic board characterized by the above. 2. The fiber-reinforced inorganic board as claimed in claim 1, wherein the fiber-reinforced inorganic board is a fiber-reinforced cement board, a fiber-reinforced calcium silicate board or a fiber-reinforced gypsum board.