JP2017109428A - Fireproof heat insulation sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof heat insulation sheet 10, soft at room temperature, expanding in the case of fire forming a heat insulation layer to thereby form a high-strength tabular shape, and excellent in adiabaticity and airtightness.SOLUTION: In a fireproof heat insulation sheet, an expandable resin 30 expanding by heat is formed on double sides of an inorganic fiber layer 20. Aluminum phosphite is contained as an expansion component in the expandable resin 30. An acrylic resin, an urethane resin or an EVA resin is contained as a resin component in the expandable resin 30. A fiber containing silicon is desirably used as the inorganic fiber layer 20.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a fire-resistant and heat-insulating sheet that can be used in a fire-proof shutter screen device that shields the internal space of a building.

  In order to prevent the spread of fire and the spread of smoke in a building in the event of a fire and to facilitate evacuation, the space is divided into a fireproof zone or a smokeproof zone. Equipment such as a fire-proof shutter screen device is systematically arranged.

  Patent Document 1 introduces a fire-proof shutter screen device in which a winding device having a winding shaft is provided on the back of the ceiling. The wind-up device contains a fire-resistant and heat-insulating sheet. In the event of a fire, the fire-resistant and heat-insulating sheet descends from the ceiling to the floor and automatically performs fire-proof and smoke-proof sections.

Patent Document 1 describes in detail a fireproof heat insulating sheet.
That is, this fireproof heat insulation sheet arrange | positions a heat insulation sheet between two nonflammable sheets. The heat insulating sheet is a sheet mainly composed of expandable graphite, and a graphite intercalation compound is used as the expandable graphite.

The heat-insulating sheet is formed to have a thickness of about 2 mm. However, it is described that in the event of a fire, the heat-insulating sheet becomes about 20 times thicker due to the expansion of the expandable graphite and becomes an expanded graphite heat-insulating layer.
And it is described that, due to the high heat insulating property of the expanded graphite heat insulating layer, even if a high temperature flame hits one surface of the fireproof heat insulating sheet, the other surface can be suppressed to a low temperature.

  However, the heat-insulating sheet expanded to 20 times the thickness by a fire becomes an aggregate of coarse particles and is a very fragile sheet. Moreover, it is a sheet | seat without airtightness with the aggregate | assembly of a coarse particle. Patent Document 1 simply describes that a flame-retardant resin layer is formed on the surface of a non-combustible sheet.

Since the fireproof heat insulating sheet divides the indoor space in the event of a fire, it must have mechanical strength to maintain a strong wall structure even after the heat insulating sheet expands.
Moreover, since the fireproof heat insulation sheet is used for fireproofing and smokeproofing indoors in the event of a fire, it must have airtightness to block flames and smoke.

“Heat insulation” required for a refractory heat insulating sheet is not sufficient simply because the heat conductivity of the heat insulating layer is low. This is because if the flame penetrates the heat insulating layer, the layer becomes completely meaningless.
After all, the fireproof heat insulating sheet needs to have heat resistance, mechanical strength, heat insulating properties and airtightness after expansion.

JP 2009-215721 A

An object of this invention is to provide the fireproof heat insulation sheet which expands at high temperature at the time of a fire, and forms a plate-shaped heat insulation layer with high intensity | strength. And it aims at providing the fireproof heat insulation sheet | seat which forms the heat-insulating layer with high airtightness which can shield a flame and smoke completely while being provided with the heat insulation with low heat conductivity.
At the same time, an object is to provide a fireproof heat insulating sheet that is highly flexible at room temperature and can be easily stored in a winding device.

  In order to achieve the above object, the fireproof heat insulating sheet of the present invention is characterized in that an expandable resin layer that expands by heat is formed on both surfaces of an inorganic fiber layer.

Moreover, it can be set as the structure in which the aluminum phosphite is contained as an expansion | swelling component in the said expandable resin layer.
Moreover, it can be set as the structure containing an acrylic resin, a urethane resin, or EVA resin as a resin component in the said expansible resin layer.

Further, the inorganic fiber layer may be configured to be a fiber containing silicon.
The inorganic fiber layer may have a weight of 150 to 600 grams per square meter.

In the fireproof heat insulating sheet of the present invention thus configured, the expandable resin layer expands in the event of a fire to form a flame retardant heat insulating layer with low thermal conductivity. The formed heat insulating layer becomes a fire barrier having high airtightness and high mechanical strength, and can completely shield the flame and smoke.
Further, it is highly flexible at room temperature and can be easily stored in a winding device.

It is a schematic sectional drawing of the fireproof heat insulation sheet which is one embodiment of this invention. It is a schematic sectional drawing of the fireproof heat insulation sheet which is other embodiment of this invention. It is a schematic sectional drawing of the fireproof heat insulation sheet which is another embodiment of this invention.

FIG. 1A schematically shows a refractory heat insulating sheet 10 according to an embodiment of the present invention.
In this fireproof heat insulating sheet 10, expandable resin layers 30 and 30 that are expanded by heat are formed on both surfaces of the inorganic fiber layer 20.
The refractory heat insulating sheet 10 shows a state where the inorganic fiber layer 20 and the expandable resin layer 30 are bonded together, and each is an independent layer without overlapping each other.

FIG. 1B schematically shows a fireproof heat insulating sheet 11 according to another embodiment.
In the fire-resistant and heat-insulating sheet 11, like the fire-resistant and heat-insulating sheet 10, expandable resin layers 30 and 30 that are expanded by heat are formed on both surfaces of the inorganic fiber layer 20.
However, the inorganic fiber layer 20 and the expandable resin layer 30 are partially overlapped with each other. This assumes a case where an expandable resin is applied to both surfaces of the inorganic fiber layer 20.

FIG. 1C schematically shows a fireproof heat insulating sheet 12 which is still another embodiment.
In the fire-resistant and heat-insulating sheet 12, like the fire-resistant and heat-insulating sheet 10, expandable resin layers 30 and 30 that are expanded by heat are formed on both surfaces of the inorganic fiber layer 20.
However, the expandable resin is in a state of being penetrated over the entire inorganic fiber layer 20. This assumes that when the expandable resin is applied to both surfaces of the inorganic fiber layer 20, the fiber density of the inorganic fiber layer 20 is rough and the expandable resin penetrates between the fibers throughout the inorganic fiber layer 20. doing.

  Although the fireproof heat insulating sheets 10, 11, and 12 all show the basic configuration of the present invention, the fireproof heat insulating sheet 10 is used as a representative for convenience in the following description.

The inorganic fiber layer 20 has a thickness of about 0.5 mm (millimeter), for example. Moreover, the expansive resin layer 30 on one side has a thickness of about 0.5 to 2.0 mm (millimeters), for example.
By setting it to such a thickness, it is possible to make the fire-resistant and heat-insulating sheet 10 with high flexibility, and it is possible to make a sheet that can be stored in a state of being wound inside the fire-proof shutter screen device.

  In the event of a fire, the fireproof insulating sheet 10 is released from the fire shutter screen device and descends toward the floor. At this time, it is preferable to provide a rod-shaped weight at the lower end of the sheet so as to be in close contact with the floor surface. Moreover, it is preferable that both right and left end portions descend with respect to the wall surface along the gap of the guide. For this reason, the fireproof heat insulating sheet 10 needs to be reasonably spread by an appropriate weight and to have an appropriate strength.

  When the fireproof heat insulating sheet 10 is suspended from the ceiling and heated to a temperature of about 200 to 300 ° C., the expandable resin layer 30 expands to form a heat insulating layer. The thickness of the heat insulating layer to be formed is preferably about 5 to 10 times the thickness of the original expandable resin layer 30. By this degree of expansion, a heat insulating layer with low thermal conductivity and high airtightness can be obtained.

  The fireproof heat insulating sheet 10 needs to maintain the state suspended from the ceiling at the time of a fire. That is, the heat insulating layer formed by the expansion of the expandable resin layer 30 is required to have strength and flame retardance that can withstand the wind pressure of hot air without peeling off from the inorganic fiber layer 20. In addition, as a plate-like wall structure with high airtightness, it is necessary to partition the space and exhibit fireproof and smokeproof functions.

  The inorganic fiber layer 20 can use metal fibers such as stainless steel fibers and carbon fibers in addition to general inorganic fibers such as silica fibers, alumina fibers, alumina silica-based fibers, glass fibers, and rock wool. .

  That is, in the present invention, “inorganic fiber” is a fiber in which these fibers are used alone or in plural, and is defined as a fiber containing at least 90% by weight of these fibers. In view of sustaining stable fire resistance at high temperatures, inorganic fibers containing silicon are preferable, and inorganic fibers containing 90% or more by weight as silicon dioxide are preferable.

In addition, as the form of the inorganic fiber layer 20, woven fabric, non-woven fabric and paper can be used, but when the expandable resin is applied to the inorganic fiber layer 20, the expandable resin is contained inside the inorganic fiber layer 20. It is preferable that it penetrates into the form of the fireproof heat insulating sheet 12 shown in FIG. 1C.
For example, a relatively coarsely woven plain weave is suitable for this purpose.

  The thickness of the inorganic fiber layer 20 can be determined by estimating the load of the refractory insulation sheet 10 itself that has become high in the event of a fire and the strength that can withstand the wind pressure of the flame. If used, the thickness can be 1 mm or less. Moreover, as the usage-amount of the inorganic fiber layer 20, it can be 150-600 g (gram) per square meter.

The expandable resin layer 30 is a mixture of an expandable component and a resin component.
As the expansion component, expansive graphite or a phosphite-based flame retardant can be used, and among them, aluminum phosphite is preferably used.
Phosphorous acid-based flame retardants have a problem of generating phosphine (PH ₃ ), but aluminum phosphite can suppress the generation of phosphine.

  As the resin component, acrylic resin, urethane resin, EVA resin (Ethylene Vinyl Acetate Copolymer), or the like can be used. Both are excellent in flexibility and strength at normal temperature, and can maintain a strong wall structure without being destroyed even after expansion when heated to a high temperature.

  The mixing ratio of the resin component and the expansion component forming the expandable resin layer 30 can be widely used, but the good properties at normal temperature of the refractory heat insulating sheet 10 are maintained over a long period, and preferable properties at high temperatures. Is determined considering that it can last for a long time.

  That is, at room temperature, the fireproof heat insulating sheet 10 stored in the fireproof shutter screen device in a wound state for a long period of time has a property that does not cause deformation and alteration, and can be normally lowered in a fire. is there.

Moreover, the fireproof heat insulation sheet 10 expanded by heating is excellent in heat resistance and heat insulation, and maintains airtightness and exhibits fireproofing and smokeproofing effects.
For example, when the resin component is an acrylic resin, the aluminum phosphite contained in the expandable resin layer 30 can be 5 to 95% by weight, but may be about 50 to 80%. preferable.

Moreover, the component for making it a more preferable property can be added to the expansible resin layer 30 other than an expansive component and a resin component.
For example, a preferable smoke-proofing effect can be obtained by adding a small amount of bromoantimony. Moreover, the generation of phosphine can be sufficiently suppressed by adding a small amount of titanium oxide.

As the inorganic fiber layer 20, a plain weave silica cloth having a weight per square meter of 310 grams and a layer thickness of about 0.5 mm was used.
For the expandable resin layer 30, a mixture obtained by adding a small amount of bromoantimony and titanium oxide to a mixture of 35% by weight of acrylic resin and 65% by weight of aluminum phosphite was used.
And the expansive resin was apply | coated to both surfaces of the inorganic fiber layer 20, and the fireproof heat insulation sheet 12 shown to FIG. 1C whose whole thickness is about 3.5 mm was produced.
The produced fireproof heat insulating sheet 12 was provided with a flexibility capable of being wound to a diameter of about 50 mm and sufficiently provided with mechanical strength.

(Test example)
Using a fireproof test furnace having a width of 3.0 m and a height of 3.2 m, the fireproof heat insulating sheet 12 was fixed to the opening of the test furnace, and the fireproof and heatproof properties were tested. That is, the inside of the furnace was heated with a gas burner, and the furnace temperature (distance 200 mm from the refractory heat insulating sheet 12) and the non-heated surface temperature (outer surface of the refractory heat insulating sheet 12) were measured with a thermocouple.

(Test results)
20 minutes after the start of the test, the furnace temperature was 885 ° C, and the non-heating surface temperature was 272 ° C.
After 40 minutes from the start of the test, the furnace temperature was 989 ° C, and the non-heated surface temperature was 275 ° C.
Sixty minutes after the start of the test, the furnace temperature was 994 ° C., and the non-heated surface temperature was 276 ° C.

When the fireproof heat insulating sheet 12 after the test was cooled and observed, the thickness expanded to about 15 mm, but a strong plate-like structure was maintained, and no damaged part was found.
Further, although some carbonization was observed on the heating surface side, it was confirmed that the non-heating surface side was in a smooth resin state and excellent in airtightness.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings, but specific configurations are not limited to these embodiments and do not depart from the gist of the present invention. A degree of design change is included in the present invention.

For example, it is preferable to form a decorative film layer on one side or both sides of the fireproof heat insulating sheet 10 to draw a figure or a letter, and write an emergency instruction or the like.
Moreover, although this invention demonstrated as a sheet | seat material which comprises a fire-resistant shutter screen apparatus, it uses as a fireproof heat insulating material which sticks a release paper via the adhesive on one side, and sticks it on the steel frame material of a building material, and covers it. You can also

10, 11, 12: Refractory heat insulating sheet 20: Inorganic fiber layer 30: Expandable resin layer

Claims (5)

  A fireproof heat insulating sheet characterized in that an expandable resin layer that expands by heat is formed on both surfaces of an inorganic fiber layer.   The fireproof heat insulating sheet according to claim 1, wherein aluminum phosphite is contained as an expansion component in the expandable resin layer.   The fireproof heat insulating sheet according to claim 1 or 2, wherein an acrylic resin, a urethane resin, or an EVA resin is included as a resin component in the expandable resin layer.   The fireproof heat insulating sheet according to any one of claims 1 to 3, wherein the inorganic fiber layer is a fiber containing silicon. The fireproof heat insulating sheet according to any one of claims 1 to 4, wherein the inorganic fiber layer has a weight of 150 to 600 grams per square meter.