JP2023149639A - Non-combustible backing material - Google Patents

Abstract

To provide a non-combustible backing material which has an excellent screw holding force, secures a high fireproof property by minimizing a use amount of a wooden plate-like base material, and can be manufactured inexpensively.SOLUTION: A non-combustible backing material 1 is constituted by: a wooden plate-like base material 10; an inorganic plate-like base material 20 laminated on one surface of the wooden plate-like base material 10; and a metal foil composite sheet 30 laminated on a surface of the inorganic plate-like base material 20, and serving as a heat shielding layer. When a composition ratio of a thickness of the inorganic plate-like base material 20 and a thickness of the wooden plate-like base material 10 is defined as inorganic plate-like base material 20: wooden plate-like base material 10=1:1 to 1:4, the non-combustible backing material 1 can be acquired which satisfies both a screw holding force and non-combustible performance.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a noncombustible base material that has high screw retention strength and fire resistance.

Inorganic materials and organic (woody) materials are used for interior materials and interior base materials of buildings. From the perspective of preventing fire accidents, the materials used for these interior materials and interior base materials are required to have nonflammability. In line with this, the Building Standards Act has established standards to ensure noncombustibility. Furthermore, depending on the building, noncombustibility performance may be required at a level that exceeds the standard law, and in such cases, noncombustibility performance may be required not only for the surface decorative board but also for the base material.
As the inorganic material, a rock wool board, a volcanic glass multi-layer board, a silica board, a melamine decorative board, etc. are used, and as the organic material, noncombustible wood and noncombustible plywood are used.

When these interior materials and interior base materials are used as wall coverings, they can be used to secure furniture such as picture frames, wall clocks, wall storage racks, wall-mounted TVs, etc. to the wall or to secure handrails, such as hooks or screws. A tool (hereinafter, a screw is used as a representative example) is used. If the wall covering material is made only of inorganic materials, there is a problem that the screw retention force is low and the screws easily come off. When using only wood materials as wall covering materials, non-combustible chemicals must be used, but non-combustible chemicals cause efflorescence due to leaching, and are expensive to begin with, so they are not actively used. There wasn't.
Therefore, in order to give the interior materials and interior base materials used as wall covering materials the ability to retain screws, wood materials are used as part of the back side, but such materials that do not use nonflammable chemicals As interior materials, there are those shown in Patent Document 1.

The interior material described in Patent Document 1 (fire-retardant wood composite material: a wall covering material in which a flammable surface sheet such as wallpaper is provided on the interior base material described below) has a first metal on the surface of a wooden plate-like base material. (aluminum) foil is pasted, and a second metal (aluminum) foil is pasted on the surface side of the first metal foil to provide a fireproof layer made of double metal foil, and a combustible surface sheet ( For example, wallpaper). These constituent members are laminated by adhesive. Here, the interior base material is made by pasting the first metal foil and the second metal foil onto the wooden plate-like base material.
In this interior base material, the thickness of the first metal foil on the wood plate-like base material side (e.g., 80 μm) is thicker than the thickness of the second metal foil on the front side (e.g., 13 μm), and the fireproof layer is formed through the adhesive layer. As mentioned above, it is a double layer of metal foil. When this fireproof layer is heated for 10 or 20 minutes at a radiation intensity of 50 kW/m ² from the side of the combustible topsheet, holes will form in the second metal foil but not in the first metal foil, The total heat generation amount was 1.9 to 2.38 MJ/m ² , which was significantly lower than the specified value of 8 MJ/m ² , and the maximum heat generation rate was 42.5 to 50.2 kW/m ² , which was lower than the specified value of 200 kW/m ² . The time required to significantly fall below and exceed the specified value is recorded as 0 seconds. Furthermore, it has been shown that there is no deformation that is harmful to disaster prevention, and that it has excellent fire retardant properties.

Japanese Patent Application Publication No. 2018-187815

However, when screws are driven into the interior material (fire-retardant wood composite material) of Patent Document 1 installed on the wall in order to fix the furniture to the wall as described above, the screws damage the combustible top sheet and the two metal foil layers. It breaks through and is driven into the wood plate-like base material. The wood plate-like base material is connected to the surface through the gap between the driven screws, the pierced combustible top sheet, and the holes in the two metal foil layers. Since the combustible surface sheet and two metal foil layers are extremely thin, the wood plate-like base material is very close to the surface of the interior material, and the heat of the flame enters through the gaps between the screws and the screw holes. This may impair fire protection.
In the interior material (fireproof wood composite material) of Patent Document 1, the parts other than the combustible surface sheet such as wallpaper and the two metal foil layers are made of a wood plate-like base material, so the above-mentioned gap is If a fire spreads through the wood plate-like base material, it may not be possible to stop the fire. In addition, if the number of metal foil layers is two, it will take more time and cost.

An object of the present invention is to provide a noncombustible base material that has excellent screw holding power, minimizes the amount of wood plate-like base material used, ensures high fire resistance, and can be manufactured at low cost.

The invention according to claim 1 includes:
A wooden plate-like base material 10, an inorganic plate-like base material 20 laminated on one side of the wood plate-like base material 10, and a metal foil composite laminated on the surface of the inorganic plate-like base material 20 to serve as a heat shielding layer. This is a noncombustible base material 1 characterized in that it is composed of a sheet 30.

The invention according to claim 2 provides the noncombustible base material 1 according to claim 1,
It is characterized in that a glass fiber paper 15 is further interposed between the wooden plate-like base material 10 and the inorganic plate-like base material 20.

The invention according to claim 3 provides the noncombustible base material 1 according to claim 1 or 2,
The composition ratio of the thickness of the inorganic plate-like base material 20 and the wooden plate-like base material 10 is configured such that the inorganic plate-like base material 20:woody plate-like base material 10=1:1 to 1:4. It is characterized by

The invention according to claim 4 provides the noncombustible base material 1 according to any one of claims 1 to 3,
The metal foil composite sheet 30 is characterized by being composed of a metal foil 31 having a thickness of 20 μm or more, and a titanium paper 32 laminated on both sides of the metal foil 31 or on the non-adhesive side of the inorganic plate-like base material. .

The invention according to claim 5 provides the noncombustible base material 1 according to any one of claims 1 to 4,
The wood plate-like base material 10 is characterized in that its air-dried density is 300 kg/m ³ or more.

Since the present invention has the above-mentioned configuration, it has excellent screw holding power, minimizes the amount of wood plate-like base material used, ensures high fire resistance, and can be manufactured at low cost.

FIG. 1 is a cross-sectional view of a noncombustible base material according to a first embodiment of the present invention. It is a sectional view of the noncombustible base material concerning a 2nd embodiment of the present invention. It is a comparison table of the screw retention force test results of the present invention and a comparative example. It is a heat generation test result table in the present invention.

The present invention will be described according to illustrated embodiments. The noncombustible base material (first embodiment: FIG. 1) of the present invention includes a wooden plate-like base material 10, an inorganic plate-like base material 20 laminated on the surface of the wooden plate-like base material 10, and an inorganic plate-like base material 20 laminated on the surface of the wooden plate-like base material 10. It is composed of a heat shielding layer made of a single-layer metal foil composite sheet 30 laminated on the surface of a base material 20, and (second embodiment: FIG. 2) consists of a wooden plate-like base material 10 and an inorganic plate-like base material 20. A glass fiber paper 15 is further interposed and bonded between the two. The explanation will be given below.

The wooden plate-like base material 10 is made of, for example, solid wood (block board), wood fiberboard (MDF, etc.), particle board (PB), OSB (Oriented Strand Board), laminated wood, plywood, or laminated veneer lumber (LVL). ) etc. Examples of the wood fiberboard include MDF (medium density fiberboard), hardboard (HB), and insulation board.

The inorganic plate-like base material 20 is a rock wool board, a volcanic glass multilayer board (mainly made of volcanic glass material and mineral fibers), a silica board, a melamine decorative board, or the like. Since the main component is inorganic, it will not undergo thermal deformation in the event of a fire.

The metal foil composite sheet 30 consists of a metal foil 31 and a titanium paper 32 with a basis weight of 20 to 30 g/m ² (a special sheet of paper in which titanium oxide is injected into the paper to give it concealment properties), which is laminated on the front and back (or one side) of the metal foil 31. paper). If the titanium paper weight is less than 20g/ ^m2 , the strength of the titanium paper itself will decrease, and if it exceeds 30g/ ^m2 , it is expected that it will be difficult to ensure performance as a non-combustible base due to the increase in combustible materials. Therefore, it is desirable that the basis weight of the titanium paper is 20 to 30 g/m ² . The titanium paper surface metal foil 31 is made of aluminum, iron, stainless steel, titanium, nickel, copper, or the like. Aluminum foil is preferred because it is easy to process and inexpensive.
When the wall surface of the metal foil composite sheet 30 is exposed to flame during a fire, the metal foil 31 reflects the radiant heat, and the heat is quickly diffused to the surroundings through the metal foil 31, thereby functioning as a heat shield layer.

The thickness of the metal foil 31 is determined to prevent holes from opening due to heating in the event of a fire, and to prevent gas generation due to combustion of the adhesive (adhesive layer 41) that adheres the metal foil composite sheet 30 to the inorganic plate-like base material 20. From the viewpoint of preventing the metal foil composite sheet 30 from expanding in the direction away from the inorganic plate-like base material 20 due to the thickness, the thickness is preferably 20 μm or more. However, if it is too thick, not only will the cost increase, but also there will be problems with workability (difficulty cutting) and from the viewpoint of preventing the weight of the non-combustible base material 1 from becoming excessive, the thickness is preferably 150 μm or less, more preferably 100 μm. or less, more preferably 80 μm or less. It is particularly preferable that it is 80 μm or less.

Adhesion between the metal foil composite sheet 30 and the inorganic plate-like base material 20 (adhesive layer 41), adhesion between the inorganic plate-like base material 20 of the first embodiment and the wooden plate-like substrate 10 (adhesive layer 43), and the second embodiment. A kneaded adhesive (for example, vinyl urethane-based adhesive) is used. As other adhesives, it is preferable to use resorcinol resin adhesives, polyester resin adhesives, etc. from the viewpoint of ensuring adhesiveness and ease of handling.

Note that an interior finishing material or an interior finishing base material such as gypsum board is attached to the surface of the metal foil composite sheet 30.

An example of the manufacturing procedure (first embodiment: FIG. 1) of the above noncombustible base material 1 is shown in which a metal foil composite sheet 30 is attached to one side of an inorganic plate-like base material 20 with a vinyl urethane adhesive (adhesive layer 41 ) A multilayer base material 5 is obtained by adhering.
Next, the other remaining surface of the inorganic plate-like base material 20 of the multilayer base material 5 is bonded to the wood plate-like base material 10 using a vinyl urethane adhesive (adhesive layer 43) to obtain the noncombustible base material 1.
In the second embodiment (FIG. 2), a metal foil composite sheet 30 is bonded to one side of an inorganic plate-like base material 20 with a vinyl urethane adhesive (adhesive layer 41), and the remaining surface is bonded with a vinyl urethane adhesive. The glass fiber paper 15 is bonded (adhesive layer 42) with a compound to obtain the multilayer base material 5.
Next, the other side of the glass fiber paper 15 of the multilayer base material 5 is bonded to the wood plate-like base material 10 using a vinyl urethane adhesive (adhesive layer 43) to obtain the noncombustible base material 1.

There are several thicknesses of the wood plate-like base material 10 and the inorganic plate-like base material 20 that constitute the noncombustible base material 1.
The inorganic plate-like base material 20 has, for example, a thickness of 3 mm, 6 mm, or 9 mm, and an appropriate thickness is selected from the viewpoint of nonflammability.
The wooden plate-like base material 10 is selected to have an appropriate thickness from the viewpoint of screw retention strength.
For the noncombustible base material 1 of the present invention, a combination that satisfies both screw retention and noncombustibility is selected. In particular, the ratio of the thicknesses of the wood plate-like base material 10 and the inorganic plate-like base material 20 is determined so as to satisfy the above-mentioned screw retention force and non-combustibility performance. Examples of the noncombustible base material 1 of the present invention are shown below.

(Example 1)
A 20 μm thick metal foil composite sheet 30 is adhered to one side of a 3 mm thick inorganic plate-like base material 20 (adhesive layer 41) to obtain a multilayer base material 5. Note that the metal foil 31 of the multilayer base material 5 in Examples 1 to 3 is aluminum foil.
Next, after applying a vinyl urethane adhesive to the surface of the 9.3 mm thick wooden plate base material 10 (cypress plywood, air-dried density 0.51 g/cm ³ ) (adhesive layer 43), this surface is coated with an adhesive layer. The non-adhesive surfaces of the metal foil composite sheets of the layer base material 5 were laminated and bonded (adhesive layer 43) to obtain a plurality of noncombustible base materials 1 with a thickness of about 12.3 mm. The composition ratio of the thickness of the inorganic plate-like base material 20 and the wooden plate-like base material 10 of this noncombustible base material 1 is 1:3.
Here, the air-dried density (air-dried specific gravity) is the specific gravity of a wood (plate-like) base material with a moisture content of 15% or less. The larger the number, the harder the material. In the case of a normal wood base material, it is 0.40 to 0.55 g/cm ³ .
(Example 2)
A 20 μm thick metal foil composite sheet 30 is adhered to one side of a 3 mm thick inorganic plate-like base material 20, and a glass fiber paper 15 with a basis weight of 50 g/m ² is adhered to the remaining other side (adhesive layer 42). A multilayer base material 5 was obtained.
Next, after applying a vinyl urethane adhesive to the surface of a 9.3 mm thick wooden plate base material 10 (cypress plywood, air-dried density 0.51 g/cm ³ ), glass fiber paper 15 is adhered to this surface. The obtained surfaces were laminated and bonded (adhesive layer 43) to obtain a plurality of noncombustible base materials 1 having a thickness of about 12.5 mm. The composition ratio of the thickness of the inorganic plate-like base material 20 and the wooden plate-like base material 10 of this noncombustible base material 1 is 1:3.
(Example 3)
A 20 μm thick metal foil composite sheet 30 was adhered to one side of a 6 mm thick inorganic plate-like base material 20 to obtain a multilayer base material 5.
Next, a vinyl urethane adhesive was applied to the surface of a 9.3 mm thick wooden plate-like base material 10 (cypress plywood, air-dried density 0.51 g/cm ³ ), and then a metal foil composite sheet was not bonded to this surface. The surfaces were laminated and bonded (adhesive layer 43) to obtain a plurality of noncombustible base materials 1 with a thickness of 15.3 mm. The composition ratio of the thickness of the inorganic plate-like base material 20 and the wooden plate-like base material 10 of this noncombustible base material 1 is 1:1.5.
(Example 4)
A 20 μm thick metal foil composite sheet 30 was adhered to one side of a 3 mm thick inorganic plate-like base material 20 to obtain a multilayer base material 5.
Next, after applying a vinyl urethane adhesive to the surface of a 12.0 mm thick wooden plate-like base material 10 (cypress plywood, air-dried density 0.51 g/cm ³ ), a metal foil composite sheet was not bonded to this surface. The surfaces were laminated and bonded (adhesive layer 43) to obtain a plurality of noncombustible base materials 1 with a thickness of 15.0 mm. The composition ratio of the thicknesses of the inorganic plate-like base material 20 and the wooden plate-like base material 10 of this noncombustible base material 1 is 1:4.
As comparative examples for the screw retention test, reinforced gypsum board and 12 mm thick softwood plywood were used.

(Screw retention test)
The test method for the screw retention force test is to drive a screw 60 with a diameter of 4 mm from the metal foil composite sheet 30 side of the noncombustible base material 1 to penetrate the wood plate-like base material 10. The driven screw 60 was pulled out in the vertical direction at a rate of 2 mm/min, and the maximum value (unit: N) of the holding force of the non-combustible base material 1 when pulled out was measured multiple times, and the average value and standard deviation were calculated. At the same time, the holding force of Comparative Example 1 (reinforced gypsum board) was set to 100, and the average value and standard deviation of each holding force were calculated. The measurement results are shown in Figure 3.

Measurement results When Comparative Example 1, which has the weakest screw retention force, is set as 100, Comparative Example 2, which was composed only of a wooden plate-like base material (12 mm thick coniferous plywood), has a laminated inorganic plate-like base material that is about 3.5 times as strong. Examples 1 and 2 exhibited a screw retention strength of approximately 4.5 times, and Example 3, in which the inorganic plate-like base material was thicker than that of Examples 1 and 2, exhibited a screw retention strength of approximately 4.8 times.
Comparative Example 2 shows about 3.5 times as much screw retention force as Comparative Example 1, but it is about 70% of the noncombustible plywood of Reference Example, and is judged to be insufficient.
Examples 1 to 3 use a wooden plate-like base material 10 with a thickness of 9.3 mm, which is thinner than that of Comparative Example 2. This is added to the holding force, and the screw holding force is approximately the same as that of the non-combustible plywood of the reference example.
In other words, even if a thin wooden plate-like base material 10 is used, the inorganic plate-like base material 20 exhibits sufficient screw holding power.

(Nonflammability evaluation test (exothermic test))
A noncombustibility evaluation test was conducted on each of the noncombustible base materials of Examples 1 to 3 in accordance with (ISO5660).
The nonflammable material standards are as follows, and it is necessary to satisfy (1) to (3) at the same time.
(1) The total calorific value during a heating time of 20 minutes is 8 MJ/m ² or less.
(2) During the 20 minute heating time, the maximum heat generation rate does not exceed 200kW/ ^m2 for 10 seconds or more.
(3) During the 20 minute heating period, no deformation, melting, cracking or other damage harmful to fire prevention shall occur.

In accordance with the heat generation test based on ISO5660, a cone calorimeter was used in the test, and each sample (10 cm x 10 cm) was heated with a radiant electric heater of 50 kW / m ² of radiant heat was applied for 20 minutes.
The determination results are shown in FIG. Examples 1 to 4 simultaneously satisfy (1) to (3).

In addition, in the above exothermic test, measurements were not made with the screw 60 driven in (no measurement test), but the non-combustible base material of the above example has a thickness of 3 mm or 6 mm, which is far greater than that of the conventional metal foil. Since the thick, incombustible inorganic plate-shaped base material 20 is placed on the indoor side, there is no gap between the screw 60 and the driving hole, which prevents fire from occurring on the indoor side. However, the flame does not go around to the wooden plate-like base material 10 side.

From the above, by setting the composition ratio of the thickness of the inorganic plate-like base material 20 and the wooden plate-like base material 10 to be in the range of 1:1 to 1:4, the screw It was possible to obtain a noncombustible base material 1 that satisfies both holding power and nonflammability.

1: Noncombustible base material, 5: Multilayer base material, 10: Wooden plate-like base material, 15: Glass fiber paper, 20: Inorganic plate-like base material, 30: Metal foil composite sheet, 31: Metal foil, 32: Titanium Paper, 41/42.43: Adhesive layer, 60: Screw

The invention according to claim 1 includes:
A wooden plate-like base material 10, an inorganic plate-like base material 20 laminated on one side of the wood plate-like base material 10, and a metal foil composite laminated on the surface of the inorganic plate-like base material 20 to serve as a heat shielding layer. In the noncombustible base material 1 composed of the sheet 30,
The metal foil composite sheet 30 is characterized by being composed of a metal foil 31 having a thickness of 20 μm or more, and a titanium paper 32 laminated on both sides of the metal foil 31 or on the non-adhesive side of the inorganic plate-like base material. .

The invention according to claim 4 provides the noncombustible base material 1 according to any one of claims 1 to 3,
The wood plate-like base material 10 is characterized in that its air-dried density is 300 kg/m ³ or more.

The invention according to claim 5 provides the noncombustible base material 1 according to any one of claims 1 to 4,
The inorganic plate-like base material 20 is characterized by being made of a rock wool board or a volcanic glass multilayer board .

Claims (5)

A wooden plate-like base material 10, an inorganic plate-like base material 20 laminated on one side of the wood plate-like base material 10, and a metal foil composite laminated on the surface of the inorganic plate-like base material 20 to serve as a heat shielding layer. A noncombustible base material comprising a sheet 30. The noncombustible base material according to claim 1, further comprising a glass fiber paper (15) interposed between the wooden plate-like base material (10) and the inorganic plate-like base material (20). The composition ratio of the thickness of the inorganic plate-like base material 20 and the wooden plate-like base material 10 is configured such that the inorganic plate-like base material 20:woody plate-like base material 10=1:1 to 1:4. The noncombustible base material according to claim 1 or 2, characterized by: The metal foil composite sheet 30 is characterized by being composed of a metal foil 31 having a thickness of 20 μm or more, and a titanium paper 32 laminated on both sides of the metal foil 31 or on the non-adhesive side of the inorganic plate-like base material. The noncombustible base material according to any one of claims 1 to 3. The noncombustible base material according to any one of claims 1 to 4, wherein the wood plate-like base material 10 has an air-dried density of 300 kg/m ³ or more.

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