JPH11117467A - Fire resistant field board - Google Patents

Abstract

(57) [Problem] To provide a lightweight, safe and inexpensive fire-resistant ground plate having a predetermined strength. SOLUTION: On a surface of an inorganic plate 1, a fire-resistant coating film 5 containing a heat-expandable inorganic granular material and a synthetic resin as essential components is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant ground plate excellent in fire resistance and non-slip properties.

[0002]

2. Description of the Related Art Heretofore, a plate material having excellent fire resistance, such as a wood wool cement board and a hard wood chip cement board, has been used as a fire-resistant field board. However, Japanese Unexamined Utility Model Publication No. 1-105123 discloses a field plate having a large number of projections having a uniform height on a flat surface in order to ensure safe operation on a roof with a large slope.

[0003]

However, when compared with a base plate having a uniform thickness, the base plate is partially thinner in the concave portion, so that stress is likely to concentrate and the strength is lower.
２20% lower. In addition, it is necessary to prepare an embossing die to form a large number of concave and convex portions, and the production cost is high. Furthermore, since many convex parts of uniform height are provided,
Workers' soles are easy to get caught, but on a slope with a large slope, smooth and rigid plates and tools tend to slide down during construction.
In general, a conventional inorganic base plate having excellent fire resistance has a large specific gravity, and is therefore very heavy in a large version. For this reason, there is a problem that it is not easy to carry on a roof with a poor scaffold, and the workability is poor.

[0004] In view of the above-mentioned object, an object of the present invention is to provide a lightweight, safe, and inexpensive fire-resistant base plate having a predetermined strength.

[0005]

Means for Solving the Problems In order to achieve the above object, a fire-resistant field base plate according to the present invention is provided on a surface of an inorganic plate,
It has a configuration in which a fire-resistant coating film containing heat-expandable inorganic granules and a synthetic resin as essential components is formed. In addition, the inorganic plate is formed by laminating an upper layer and a lower layer mainly containing a mineral fiber, an inorganic powder, and a binder on the front and back surfaces of a middle layer portion containing an inorganic foam and a binder as essential components, respectively. It may be something.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment according to the present invention will be described with reference to the accompanying drawings of FIG. In this embodiment, a refractory coating film 5 is formed on the surface of an inorganic plate 1. The inorganic plate 1 is formed by laminating and integrating upper and lower layers 3 and 4 on the front and back surfaces of a middle layer 2 respectively.

The inorganic foam forming the middle layer 2 is added for weight reduction while maintaining the compressive strength. For example, perlite, shirasu foam, silica flower, glass foam, vermiculite, There are obsidian foams and the like, which can be used alone or in combination of two or more. And the addition amount of the inorganic foam,
It is preferable that the content be 40 to 80 parts by weight based on the entire middle layer. 4
If the amount is less than 0 parts by weight, the desired weight reduction effect cannot be obtained. If the amount exceeds 80 parts by weight, the proportion of the inorganic powder and the binder becomes small, and the desired compressive strength cannot be obtained. It is.

The binder for forming the middle layer 2 is added for binding and integrating the inorganic foam.
For example, synthetic resins such as polyvinyl alcohol resin, phenol resin and epoxy resin, starch and the like can be mentioned, and these can be used alone or in combination of two or more. And the amount of the binder added is
It is preferably 5 to 20 parts by weight of the whole. If the amount is less than 5 parts by weight, sufficient strength cannot be obtained.
If the amount exceeds 0 parts by weight, fire resistance is impaired.

If necessary, an inorganic powdery material may be added to the middle layer 2 as a filler to increase the hardness and the screwing performance while maintaining fire resistance. Examples of such an inorganic powder include calcium carbonate, aluminum hydroxide, silica sand, microsilica, and slag. The content of the inorganic powdery substance in the middle layer 2 is preferably set to 40 parts by weight or less of the entire middle layer. If the amount exceeds 40 parts by weight, the amount of the inorganic foam decreases and the plate material becomes heavy.

[0010] If necessary, a fibrous material for connecting the inorganic foam may be added to the middle layer portion 2. Examples of the fibrous material include synthetic resin fibers such as polypropylene and polyester, and natural fibers such as pulp, hemp and flax. These can be used alone or in combination of two or more. The content of the fibrous material is preferably 3 to 15 parts by weight of the entire middle layer 2. If the amount is less than 3 parts by weight, the desired bending strength cannot be obtained. If the amount exceeds 15 parts by weight, the effect of reducing the weight cannot be obtained. In addition, you may use the heat fusion fiber which also has the function as a binder as needed.

The mineral fibers forming the upper and lower layers 3 and 4 include, for example, rock wool, slag wool, mineral wool, and glass wool. These can be used alone or in combination of two or more. Can be used in combination. The content of the mineral fibers is preferably 20 to 80 parts by weight of the entire upper and lower layers 3 and 4.
If the amount is less than 20 parts by weight, the desired bending strength cannot be obtained. If the amount exceeds 80 parts by weight, the ratio of the inorganic powdery material is relatively reduced, so that the desired surface hardness cannot be secured. is there.

The inorganic powder added to the upper and lower layers 3 and 4 may be used to increase the hardness and the screwing performance while maintaining fire resistance. Examples of the inorganic powder include calcium carbonate, aluminum hydroxide, silica sand, microsilica, slag, and the like, and these can be used alone or in combination of two or more. Then, these inorganic powders are formed in the upper and lower layers 3 and 4.
The total amount is preferably 10 to 60 parts by weight. If the amount is less than 10 parts by weight, the desired surface hardness cannot be obtained, and if it exceeds 60 parts by weight, the ratio of the mineral fiber for imparting strength decreases, and the desired bending strength cannot be obtained.

The binder forming the upper and lower layers 3 and 4 is for binding and integrating the mineral fiber and the inorganic powdery material. It is almost the same as the binder.

Further, in addition to the mineral fibers, another fibrous material may be added to the upper and lower layers 3, 4 as required.
Examples of other fibrous materials include synthetic resin fibers such as polypropylene and polyester, and natural fibers such as pulp, hemp and flax.
More than one species can be used in combination. The amount of the fibrous material added is preferably 3 to 15 parts by weight of the entire upper and lower layers 3 and 4. If the amount is less than 3 parts by weight, the desired bending strength cannot be obtained. If the amount exceeds 15 parts by weight, the effect of reducing the weight cannot be obtained. In addition, you may use the heat fusion fiber which also has the function as a binder as needed.

The refractory coating film 5 is formed of a refractory paint obtained by adding a heat-foamable inorganic particulate material to a general synthetic resin for exterior paint. Examples of the synthetic resin include an acrylic resin, an acrylic urethane resin, a urethane resin, and an epoxy resin. The content of the synthetic resin in the refractory coating film 5 is preferably 5% by weight to 20% by weight. When the content is less than 5% by weight, the adhesion of the granular material is not sufficient, and the granular material is easily peeled from the coating film.
If it exceeds 20% by weight, it is not preferable in terms of fire resistance.

[0016] The heat-foamable inorganic particulate material foams when heated by a fire or the like to form an inorganic foam layer on the plate, thereby cutting off flames and relaxing heat conduction. And, it is intended to suppress a rapid rise in temperature in the ceiling and inside the room, to prevent the occurrence of fire due to the ignition of combustibles, and to prevent the spread of fire until the start of fire extinguishing work as much as possible. Examples of the inorganic particles include pearlite, vermiculite, obsidian, shirasu, and graphite that are not foamed. The particle size is preferably from 0.1 to 1.0 mm. If the particle size is less than 0.1 mm, desired irregularities cannot be formed on the surface of the inorganic plate 1 and a sufficient anti-slip effect cannot be obtained. Further, when it exceeds 1.0 mm, the inorganic particulate matter is easily peeled from the coating film. Furthermore, even if foaming is caused by heating due to a fire or the like, a sufficient heat insulating layer cannot be formed. In addition, the inorganic particles need not necessarily be spherical, and may be, for example, flat. However, when the inorganic particles are flat, the width is preferably about 0.1 mm to 2 mm. If it exceeds 2 mm, it becomes too large and is easily peeled. Further, the amount of the inorganic particles added is preferably 10% by weight to 30% by weight. If the amount is less than 10% by weight, the anti-slip effect is small, and if it exceeds 30% by weight, the inorganic particulate matter is easily peeled from the coating film.

Further, it is preferable to add an inorganic powder as a viscosity adjusting material of the coating material. For example, aluminum hydroxide, aluminum carbonate, clay and the like can be used. Further, additives generally used in paints may be added as necessary.

Next, an example of a method for manufacturing a fire-resistant ground plate according to the present invention will be described. Mineral fiber, inorganic powder, binder and fibrous material are appropriately charged and stirred into fresh water to obtain a slurry of a predetermined concentration, which is guided to a fourdrinier machine to form upper and lower layers 3 and 4. To make a wet inorganic mat.
On the other hand, the inorganic foam, the fibrous material, the inorganic powder, and the binder are mixed while spraying fresh water to obtain a middle layer mixture. Then, the mixture for the middle layer is uniformly sprayed, deposited and laminated on the upper surface of the wet inorganic mat to be the lower layer portion 4.
Then, the wet mat to be the upper layer portion 3 is superimposed on the sprayed and deposited mixture for the middle layer to obtain a laminate, which is subjected to heat and pressure integration at a predetermined temperature and pressure, and then dried with hot air.
Then, the refractory paint is applied and dried to form the refractory coating film 5.

[0019]

【Example】

(Example) 65% by weight of rock wool as mineral fiber,
20% by weight of aluminum hydroxide as inorganic powder, 5% by weight of pulp, and 10% by weight of powdered phenol and starch as a binder were poured into clear water and stirred to obtain a slurry of about 2% obtained. Then, the slurry was paper-formed by a fourdrinier paper-making machine to obtain a wet mat having a thickness of 8 mm as an upper layer portion and a lower layer portion.

On the other hand, 65% by weight of pearlite as an inorganic foam, 20% by weight of aluminum hydroxide as an inorganic powder, 5% by weight of pulp, 10% by weight of powdered phenol and starch as a binder are sprayed with fresh water and mixed while spraying. To obtain a mixture.

This mixture was sprayed and deposited on the wet mat as the lower layer to form a middle layer. Then, the wet mat to be the upper layer is laminated on the upper surface thereof to have a thickness of 56 m.
m was obtained. Then, the laminate is heated to a temperature of 100 ° C.
After pressing with a hot press for 5 minutes, dried with a hot air drier at a temperature of 200 ° C. for 60 minutes, specific gravity 0.7, thickness 18
mm inorganic plate was obtained.

Further, a refractory paint was applied to the surface of the inorganic plate by spraying at a rate of about 100 g / m ² and dried by a drier to form a refractory paint film. The fire-resistant paint was composed of 10% by weight of an acrylic resin, 30% by weight of vermiculite having a particle size of 0.5 mm, 57% by weight of aluminum oxide, and 3% by weight of methylcellulose.
To about 3000 cps.
The coating method may be uniform coating or granular coating.

(Comparative Example 1) A sample obtained by treating in the same manner as in the above-mentioned Example except that no refractory coating film was formed was used as a sample.

Comparative Example 2 A hard wood chip cement board of 3 × 6 with a thickness of 18 mm widely used as a field board was used as a sample.

The obtained sample was subjected to a slip test, a construction test and a flame retardancy test. (1) Sliding test The slope of the test piece was set to a 4-dimension slope (a slope with a bottom of 1 shank and a vertical dimension of 4 mm), and was pulled using an Ono-type OY pull slip meter until a weight of 80 kg started to slide, The slip resistance coefficient was measured. The slip resistance coefficient of the example is 0.69.
Whereas that of Comparative Example 1 was 0.53. From this result, it was found that the example was less slippery than the comparative example 1.

(2) Construction Test The embodiment and the comparative example 1 were actually constructed on site and the degree of slip resistance was tested. As a result, a worker reported that he felt that the example was less slippery than the comparative example. In addition, when the example and the comparative example 2 were actually constructed, the thickness of the 18 mm thick 3 × 6 hard wood chip cement board was 36 kg, whereas the example of the same dimensions was 21 kg. This proved that the construction was easy and safe even on a roof with poor scaffolding.

(3) Flame retardancy test The flame retardancy of the surface was determined based on JIS-A1321.
The temperature time area (tdθ) surrounded by the exhaust temperature curve and the standard temperature curve was measured. The temperature time area of the embodiment is 50
(° C. · min), whereas that of Comparative Example 1 was 8
0 (° C. · min). From the measurement results of Example and Comparative Example 1, it was found that each of them had a predetermined flame retardancy, but Examples had better flame retardancy than Comparative Example 1,
It was found that the burning of the coating film and organic components (pulp and binder) could be further suppressed.

[0028]

As is apparent from the above description, the fire-resistant ground plate according to the present invention is obtained by forming a fire-resistant coating film containing heat-expandable inorganic particles on the surface of an inorganic plate.
For this reason, when a fire occurs, the heat-foamable inorganic particulate matter distributed in the coating film is heated and foamed to form a thick inorganic foam layer on the inorganic plate, thereby blocking the flame. As a result, heat conduction is alleviated, so that a rapid rise in temperature in the ceiling or inside the room is suppressed, fires due to ignition of combustibles are prevented, and fire spread until fire extinguishing work is started can be suppressed. Further, the inorganic plate itself has no uneven portion unlike the conventional example and has a uniform thickness. For this reason, stress concentration hardly occurs, and there is no decrease in strength unlike the conventional example. Further, the irregularities formed by the heat-foamable inorganic particles are generally irregular. For this reason, even if a smooth and rigid plate material, tool, or the like is placed, it does not easily slide down, and is safer than the conventional example. The heat-foamable inorganic particles have high surface strength because they are not foamed until heated by a fire or the like. For this reason, even if a worker walks on the fire-resistant field board of the present invention during the construction work, it is not damaged and the construction is easy. Then, it is not necessary to prepare an embossing die for forming the irregularities as in the conventional example, and the cost can be reduced, so that an inexpensive fire-resistant ground plate can be obtained.

According to the second aspect, since the inorganic foam is added to the middle layer, the weight is reduced. For this reason, there is an effect that it is easy to transport even on a roof with a poor scaffolding, and a fire-resistant ground plate that is easy to construct can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a fireproof base plate of the present invention.

[Explanation of symbols]

1 ... Inorganic plate, 2 ... Middle layer, 3,4 ... Top and bottom layers, 5 ... Fireproof coating.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 27/04 B32B 27/04 Z E04B 1/94 E04B 1/94 SV

Claims (2)

[Claims] 1. A fire-resistant ground plate comprising a heat-expandable inorganic particulate material and a synthetic resin as essential components formed on the surface of an inorganic plate. 2. An upper and lower layer comprising mineral fiber, an inorganic powder and a binder as essential components on the front and back surfaces of a middle layer portion of the inorganic plate, which comprises an inorganic foam and a binder as essential components, respectively. The fire-resistant field board according to claim 1, wherein the fire-resistant field board is integrated.