JP7176905B2 - Incombustible backup material and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a nonflammable backup material and a method for producing the same.

Fireproof glass doors for buildings are required to use a noncombustible backup material for the sash so that the glass can be held in the window frame even in the event of a fire. At present, most backup materials are made of organic foamed resin, but in recent years, there has been a demand for inorganic non-combustible backup materials that exhibit higher holding power in the event of a fire. ing.

As a backup material containing inorganic fibers as a main component, for example, Patent Literature 1 discloses a nonflammable backup material for a fireproof glass door mainly composed of glass fiber. This backup material is obtained by impregnating an inorganic fiber needle mat mainly composed of glass fibers with a water-soluble acrylic resin as a binder between fibers. However, the heat resistance of such a nonflammable backup material is not sufficient. Furthermore, when the backup material is machined at the factory, the human body may be adversely affected if the scattered powder is inhaled.

As a nonflammable backup material containing inorganic fibers as a main component, a material containing refractory ceramic fibers (RCF) having higher heat resistance than glass fibers is known. Such a nonflammable backup material can therefore obtain higher heat resistance than the backup material of Patent Document 1. However, since RCF is designated as a substance subject to the Ordinance on Prevention of Hazards due to Specified Chemical Substances, many restrictions are imposed on its use, such as the obligatory use of official dust masks and the installation of official local exhaust ventilation systems. It became so. Therefore, there is a demand for a nonflammable backup material that has performance equal to or better than that obtained when RCF is blended and that is not affected by the above legal regulations.

JP-A-9-170383

The present invention has been made to solve the above problems, and while having performance equal to or higher than when using RCF, on the other hand, like RCF, it does not have the restrictions of the specific chemical substance hazard prevention regulations. To provide a nonflammable backup material capable of suppressing scattering of fibers during cutting in order to reduce adverse effects on the human body.

In order to achieve the above objects, the present invention provides a nonflammable backup material to be loaded into the inner circumferential groove of a sash of a glass door, comprising a polyester nonwoven fabric layer and an inorganic fiber layer containing glass fibers and alkaline earth silicate wool. is laminated and felted at least one layer at a time, and the entirety of the nonflammable backup material is impregnated with an inter-fiber bonding material.

Such a noncombustible backup material has performance equal to or higher than that when using RCF, specifically high noncombustibility, high elasticity, sufficient post-compression restorability, and moderate compressive strength. On the other hand, unlike RCF, it is not subject to the restrictions of specific chemical substance hazard prevention regulations, and in order to reduce adverse effects on the human body, it is a nonflammable backup material that can suppress scattering of fibers during cutting. be able to.

Further, it is preferable that one layer of the polyester nonwoven fabric layer and one layer of the inorganic fiber layer are laminated and felted.

With such a material, the performance as a non-combustible backup material can be sufficiently exhibited, and the material can be easily manufactured.

Further, when the inorganic fiber layer has a total content of the glass fiber and the alkaline earth silicate wool of 100% by mass,
30% by mass or more and 98% by mass or less of the glass fiber, and 2% by mass or more and 70% by mass or less of the alkaline earth silicate wool;
is preferably blended in a ratio of

Such an inorganic fiber layer can be used as a nonflammable backup material having sufficient physical properties such as heat resistance, elasticity, compression recovery, and compression strength.

Moreover, it is preferable that the interfiber binder is starch.

With such an interfiber binder, the powder that scatters when the nonflammable backup material is cut in a factory has less adverse effects on the human body.

The alkaline earth silicate wool preferably contains SiO ₂ , MgO and CaO as main components and has the following composition.
SiO ₂ : 73.6% by mass to 85.9% by mass
MgO: 9.0% by mass to 15.0% by mass
CaO: 5.1% by mass to 12.4% by mass
Al ₂ O ₃ : 0% by mass or more and less than 2.3% by mass Fe ₂ O ₃ : 0% by mass to 0.50% by mass
SrO: less than 0.1% by mass

Since such alkaline earth silicate wool is excellent in biosolubility, heat resistance, and alumina reactivity resistance, it can be suitably used for the nonflammable backup material of the present invention.

Further, the alkaline earth silicate wool preferably has an average fiber diameter of 3 to 5 μm.

With such an average fiber diameter, the small fiber diameter increases the number of crossing points (points of contact) between the fibers, so that the required physical properties can be obtained even with a small amount of interfiber binder to be impregnated. can be done.

Moreover, it is preferable that the glass fiber is made of E glass.

Such glass fibers not only have excellent heat resistance, but are also inexpensive and readily available.

Further, it is preferable that the average fiber diameter of the glass fiber is 6 to 13 μm.

With such an average fiber diameter, since the fiber diameter is rather small, the number of crossing points (contact points) between the fibers is large, so that less interfiber binder is impregnated to obtain the desired physical properties. At the same time, since it has a constant thickness, it exerts a repulsive force and can impart more suitable compression recovery properties to the nonflammable backup material of the present invention.

Moreover, in the present invention,
(1) A step of laminating an inorganic fiber layer containing glass fibers and alkaline earth silicate wool on a polyester nonwoven fabric layer, and then joining the polyester nonwoven fabric layer and the inorganic fiber layer by needle punching to produce a felted mat;
(2) a step of immersing the mat in a solution containing an interfiber binder to impregnate the entire mat with the interfiber binder;
(3) a step of heat-press molding the mat impregnated with the inter-fiber binder; and (4) a step of heat-drying the heat-press-molded mat.
To provide a method for manufacturing a noncombustible backup material comprising:

The nonflammable backup material of the present invention can be produced by such a method.

As described above, the incombustible backup material of the present invention is a noncombustible backup material that has heat resistance equal to or higher than that of the case of using RCF and is not subject to the restrictions of the Ordinance on Prevention of Hazards due to Specified Chemical Substances. be able to. In addition, by impregnating the entire backup material with the interfiber binder, there is no scattering of fibers during cutting at the factory. By using a material that has less adverse effects, it is possible to obtain a nonflammable backup material that has less adverse effects on the human body when the scattered powder is inhaled.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing one example (two-layer structure) of the nonflammable backup material of the present invention. FIG. 4 is a schematic diagram showing another example of another aspect of the noncombustible backup material of the present invention (multi-layer structure alternately laminated). FIG. 3 is a schematic diagram showing an example of another aspect of the nonflammable backup material of the present invention (multi-layer structure in which inorganic fiber layers are continuously laminated). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing one example of a mode in which the nonflammable backup material of the present invention is used;

As described above, although it has performance equal to or higher than that when using RCF, specifically high nonflammability, high elasticity, sufficient post-compression resilience, and moderate compressive strength, etc., On the other hand, unlike RCF, there is a demand for the development of a non-combustible backup material that is not restricted by the Ordinance on Prevention of Hazards from Specified Chemical Substances and that can suppress the scattering of fibers during cutting in order to reduce adverse effects on the human body. .

As a result of intensive studies on the above problems, the present inventors have found that by replacing RCF with alkaline earth silicate wool (AES), it has heat resistance equal to or higher than that when using RCF, and specialized The inventors found that it is possible to produce a nonflammable backup material that is not subject to the regulations of the law, and that scattering of fibers can be prevented by impregnating not only the surface of the nonflammable backup material but also the entire surface of the nonflammable backup material with an interfiber binder, thereby completing the present invention. .

That is, the present invention provides a nonflammable backup material to be loaded into the inner circumferential groove of a sash of a glass door, comprising at least one polyester nonwoven fabric layer and at least one inorganic fiber layer containing glass fiber and alkaline earth silicate wool. The incombustible backup material is a noncombustible backup material that is obtained by being hardened and felted, and in which the entire noncombustible backup material is impregnated with an interfiber bonding material.

Although the present invention will be described in detail below, the present invention is not limited thereto.

[Noncombustible backup material]
As shown in FIG. 1, the nonflammable backup material 1 of the present invention has, for example, a two-layer structure in which an inorganic fiber layer 2 and a polyester nonwoven fabric layer 3 are layered and felted. The whole is impregnated with an interfiber binder (not shown). Alternatively, one inorganic fiber layer may be sandwiched between polyester nonwoven fabric layers from both sides to form a felt structure. In addition to these, the nonflammable backup material 1 of the present invention can be made by alternately laminating a plurality of inorganic fiber layers 2 and polyester nonwoven fabric layers 3 to form a felt, for example, as shown in FIG. As shown in FIG. 3, the inorganic fiber layer 2 may be continuously laminated over a plurality of layers, and may include a structure in which this is laminated with the polyester nonwoven fabric layer 3 to form a felt.

Although the thickness of each inorganic fiber layer 2 is not particularly limited, it can be, for example, 1 mm to 20 mm, more preferably 2 mm to 15 mm, and still more preferably 3 mm to 12 mm. The thickness of each polyester nonwoven fabric layer is not particularly limited, but can be, for example, 0.05 mm to 2 mm, more preferably 0.1 mm to 0.5 mm.

In the nonflammable backup material of the present invention, the entire nonflammable backup material is impregnated with an interfiber binder, which imparts properties of high elasticity and resilience. It is preferably used as a member for holding. In particular, it is possible to impart rigidity (high bending strength) for good workability when processed to fit a large window frame. Furthermore, it is possible to prevent scattering of fibers during cutting in a factory.

As shown in FIG. 4, the nonflammable backup material 1 of the present invention as described above is loaded into the inner peripheral groove 4 of the sash of a glass door (especially a fireproof glass door), and together with the sealing material 5, the setting block 6 is set. It holds a plate glass 7 (a window glass, such as a wired plate glass or a heat-resistant plate glass) attached to the sash via the glass plate.

In the event of a fire, even if the sealing material 5 is destroyed by fire, the incombustible backup material 1 of the present invention has high heat resistance and therefore remains without being destroyed by fire, and continues to hold the glass door while allowing the flame to escape from the inner peripheral groove. has the effect of preventing passage through

[Inorganic fiber layer]
The inorganic fiber layer of the nonflammable backup material of the present invention contains glass fiber and alkaline earth silicate wool.

The inorganic fiber layer contains 30% by mass or more and 98% by mass or less of glass fiber and 2% by mass of alkaline earth silicate wool when the total content of glass fiber and alkaline earth silicate wool (AES) is 100% by mass. It is preferably blended at a ratio of 70% by mass or more, but more preferably 80% by mass or more and 98% by mass or less of glass fiber, and 2% by mass or more and 20% by mass or less of alkaline earth silicate wool. More preferably, the ratio of glass fiber is 90% by mass or more and 95% by mass or less, and the ratio of alkaline earth silicate wool is 5% by mass or more and 10% by mass or less. If the glass fiber content is 30% by mass or more, it will have sufficient compression recovery properties. If the AES is 2% by mass or more, it will have good heat resistance.

Such an inorganic fiber layer can be used as a nonflammable backup material having sufficient physical properties such as heat resistance, elasticity, compression recovery, and compression strength.

<Alkaline Earth Silicate Wool (AES)>
The inorganic fiber layer contains alkaline earth silicate wool (hereinafter referred to as AES), which has high heat resistance. If RCF is used like existing incombustible backup materials, there is concern that it may adversely affect the health of workers, especially respiratory illnesses. becomes larger. In contrast, using AES reduces these adverse health effects. In particular, unlike RCF, AES is not regulated by the Ordinance on Prevention of Hazards from Specified Chemical Substances, so it is essential for the nonflammable backup material of the present invention.

AES is not particularly limited, and any AES can be used. For example, the one disclosed in Japanese Patent No. 5634637 is preferable.

Such an AES preferably has, for example, SiO ₂ , MgO, and CaO as main components and has the following composition.
SiO ₂ : 73.6% by mass to 85.9% by mass
MgO: 9.0% by mass to 15.0% by mass
CaO: 5.1% by mass to 12.4% by mass
Al ₂ O ₃ : 0% by mass or more and less than 2.3% by mass Fe ₂ O ₃ : 0% by mass to 0.50% by mass
SrO: less than 0.1% by mass

Since such AES is excellent in biosolubility, heat resistance, and alumina reactivity resistance, it can be suitably used for the nonflammable backup material of the present invention.

Also, the average fiber diameter of the alkaline earth silicate wool is preferably 3 to 5 μm, more preferably 4 μm.

With such an average fiber diameter, the small fiber diameter increases the number of crossing points (points of contact) between the fibers, so that the required physical properties can be obtained even with a small amount of interfiber binder to be impregnated. can be done.

The method for measuring the average fiber diameter of the alkaline earth silicate wool is not particularly limited. A sample is prepared by uniformly adhering the sample to a tape, and the average fiber diameter is obtained by observing the sample with an electron microscope. In addition to this method, A method described in JIS R 3420 (contour observation of a filament placed in a medium with a different refractive index than glass and measuring the diameter with a microscope) or B method (resin Observing the cross section of the impregnated and cured strand under a microscope and measuring the diameter of the filaments in the strand) may also be used.

The fiber length of alkaline earth silicate wool is not particularly limited, but is preferably 20 to 600 mm, more preferably 30 to 400 mm, even more preferably 50 to 200 mm. If it is 20 mm or more, the holding force can be maintained more reliably even in the event of fire. If it is 600 mm or less, the handleability at the time of production will be excellent.

<Glass fiber>
The glass fiber is not particularly limited, but may be E glass, C glass, S glass, or D glass, for example. Among them, it is particularly preferable to use E glass from the viewpoint of heat resistance, price, and the like.

Also, the average fiber diameter of the glass fibers is preferably 6 to 13 μm, more preferably 8 to 11 μm, still more preferably 9 to 10 μm.

With such an average fiber diameter, since the fiber diameter is rather small, the number of crossing points (contact points) between the fibers is large, so that less interfiber binder is impregnated to obtain the desired physical properties. At the same time, since it has a constant thickness, it exerts a repulsive force and can impart more suitable compression recovery properties to the nonflammable backup material of the present invention.

The method for measuring the average fiber diameter of the glass fiber is not particularly limited. and measure the diameter) or B method (observe the cross section of a strand impregnated with resin and cured with a microscope and measure the diameter of the filament in the strand).

Although the fiber length of the glass fiber is not particularly limited, it is preferably 20 to 600 mm, more preferably 30 to 400 mm, even more preferably 50 to 200 mm. If it is 20 mm or more, the holding force can be maintained more reliably even in the event of fire. If it is 600 mm or less, the handleability at the time of production will be excellent.

<Other fibers>
In addition to AES and glass fiber, the inorganic fiber layer of the nonflammable backup material of the present invention can also contain other fibers. Other fibers are not particularly limited. When other fibers are inorganic fibers, for example, ceramic fibers, rock wool, silica fibers, slag wool and the like can be used. When the other fibers are organic fibers, for example, polyester fibers, polyamide fibers, PVA fibers, polyacrylic fibers, rayon fibers, cotton and the like can be used. When the other fibers are heat-fusible fibers, examples thereof include vinylon fibers, nylon fibers, polyethylene fibers, low-melting-point polyester fibers, and the like. These may be used singly or in combination.

[Polyester nonwoven fabric layer]
The polyester nonwoven fabric layer is used as a so-called holding material for holding the inorganic fiber layer. The polyester nonwoven fabric is not particularly limited, and various polyester nonwoven fabrics can be used. For example, polyester spunbond nonwoven fabric (manufactured by Toyobo Co., Ltd., trade names "Bolance", "Ecoure", "Heim"), etc. can be used. can be done.

[Interfiber binder]
The interfiber binder is not particularly limited, and various resin components can be used. However, it is preferable that the binder has little adverse effect on the human body when inhaling the scattered powder during cutting in a factory. Examples of such resin components include starch. The starch is not particularly limited, but examples include cornstarch, waxy cornstarch, high amylose cornstarch, wheat starch, rice starch, potato starch, sweet potato starch, tapioca starch, mylostarch, sago starch, arrowroot starch, bracken starch, lotus root starch, Alternatively, mung bean starch and the like can be mentioned. These may be used singly or in combination. Among them, corn starch is particularly preferable because it has high biodegradability and is inexpensive.

Resin components other than starch that are biodegradable (biodegradable resins) are suitable for use in the nonflammable backup material of the present invention. Examples of such biodegradable resins include , polylactic acid, polyethylene succinate, polycaprolactone, polybutylene succinate, polyhydroxybutyrate, polybutylene succinate adipate, polybutylene succinate carbonate, polybutylene succinate terephthalate, polybutylene adipate terephthalate, polytetramethylene adipate terephthalate, Examples include aliphatic polyesters such as polybutylene succinate adipate terephthalate, polyvinyl alcohol, cellulose acetate, and polymers modified from these.

In addition to the above-described resin components, the interfiber binder may also include phenol-formaldehyde resin, melamine-formaldehyde resin, urea-formaldehyde resin, furan resin, epoxy resin, unsaturated polyester resin, alkyd resin, and xylene resin. , bisdiene resin, BT resin, diallyl phthalate resin, urethane resin, thermosetting resin such as silicone resin, polyethylene resin, polypropylene resin, polyisobutylene resin, polycarbonate resin, saturated polyester resin, polyvinyl chloride resin, polyvinylidene chloride resin, Polyvinyl acetate resin, polyvinyl alcohol resin, polyvinyl acetal resin, polymethyl methacrylate resin, polyacrylonitrile resin, polyamide resin, polyimide resin, cellulose resin, cellulose acetate resin, fluorine resin, chlorinated polyether resin, polystyrene resin, Thermoplastic resins such as polymethylbenzene resin, polyethylene oxide resin, chroman-indene resin, polyvinylpyrrolidone resin, ethylene-vinyl alcohol copolymer resin, polyglutamic acid resin, polyhydroxyolefin resin, polysulfone resin, petroleum resin, natural rubber, Chloroprene rubber, styrene rubber, nitrile rubber, acrylonitrile-butadiene-styrene copolymer rubber, butyl rubber, polysulfide rubber, silicone rubber, butadiene rubber, ethylene propylene rubber, tetrafluoroethylene propylene rubber, chlorosulfonate polyethylene, urethane elastomer, Rubbers or elastomers such as fluoroelastomer, ethylene/vinyl acetate copolymer, halogenated butyl rubber, isoprene rubber, shrimp chlorohydrin rubber, ethylene propylene rubber, fluorosilicone rubber, and ethylene propylene diene rubber may be used.

As the inter-fiber binder, one of the above resin components may be used alone, or a plurality of them may be mixed and used.

Furthermore, as the interfiber binder, not only the resin component as described above, but also various additives may be added to the resin component, if necessary. Examples of such additives include surfactants, antifoaming agents, thickeners, preservatives and the like.

[Manufacturing method of incombustible backup material]
Moreover, in the present invention,
(1) A step of laminating an inorganic fiber layer containing glass fibers and alkaline earth silicate wool on a polyester nonwoven fabric layer, and then joining the polyester nonwoven fabric layer and the inorganic fiber layer by needle punching to produce a felted mat;
(2) a step of immersing the mat in a solution containing an interfiber binder to impregnate the entire mat with the interfiber binder;
(3) a step of heat-press molding the mat impregnated with the inter-fiber binder; and (4) a step of heat-drying the heat-press-molded mat.
To provide a method for manufacturing a noncombustible backup material comprising:

<Step (1)>
In step (1), after laminating an inorganic fiber layer containing glass fibers and alkaline earth silicate wool on a polyester nonwoven fabric layer, the polyester nonwoven fabric layer and the inorganic fiber layer are joined by needle punching to produce a felted mat. After producing the mat, a step of cutting the mat to an appropriate width can be further performed. The polyester nonwoven fabric layer and the inorganic fiber layer used here can be those described above, and the felting by needle punching can employ any of the commonly used methods.

<Step (2)>
Step (2) is a step of immersing the mat in a solution containing the interfiber binder to impregnate the entire mat with the interfiber binder. As the interfiber binding material, the above-described ones can be used. Although the solution containing the interfiber binder is not particularly limited, for example, a 1 to 10% starch aqueous solution can be used.

<Step (3)>
Step (3) is a step of heat-press molding the mat impregnated with the interfiber binder. The temperature during hot press molding can be, for example, 100°C to 300°C. Moreover, in hot press molding, it is preferable to use a spacer so that the press molded product has a predetermined thickness. By changing the thickness of the spacer to be used, it is possible to produce a mat having a desired thickness according to need.

<Step (4)>
Step (4) is a step of heating and drying the heat-press-molded mat. The drying conditions are not particularly limited, but can be, for example, 100 to 200° C. for 5 minutes to 10 hours.

The nonflammable backup material of the present invention can be produced by such a method. After that, it may be cut to the appropriate dimensions.

EXAMPLES The present invention will be specifically described below using Examples and Comparative Examples, but the present invention is not limited to these.

[Example 1]
E-glass and AES were mixed at a ratio of E-glass:AES=92.3:7.7 to produce an inorganic fiber layer. This was laminated on a polyester nonwoven fabric (polyester nonwoven fabric layer), and the inorganic fiber layer and the polyester nonwoven fabric layer were joined by needle punching and felted to prepare a mat. After cutting this mat into a width of 900 mm, it was immersed in a 3% starch (cornstarch) aqueous solution to allow the starch to penetrate into the inside of the mat. The starch-impregnated mat was then pressed at 180°C for 10 minutes using spacers of the required thickness and then dried at 150°C for 60 minutes to produce non-combustible Each backup material was produced.

[Comparative Example 1]
Comparative incombustible backup materials of various thicknesses were produced in the same manner as in Example 1, except that AES was changed to RCF (trade name: SC Bulk 1260, manufactured by Shin-Nippon Thermal Ceramics Co., Ltd.).

The noncombustible backup materials obtained in Example 1 and Comparative Example 1 and the comparative noncombustible backup materials were subjected to the following tests to evaluate performance. Table 1 shows the results.

<Bulk density measurement>
A sample was cut from the produced incombustible backup material, and the length, width, and height of the sample were measured using a dimension measuring device (eg, vernier caliper). Next, the weight of the sample was measured, and the bulk density was measured by the following formula.
Bulk density (g/cm ³ ) = weight/vertical dimension/horizontal dimension/height

<Ignition loss measurement>
Ignition loss (mass%) is the mass of the crucible containing the test piece when a test piece is placed in a crucible of mass W _R (g) and held at a temperature of 20 ° C. and a relative humidity of 65% for 24 hours. _The weight of the crucible containing the test piece was heated at 625° C. for 30 minutes and then allowed to cool.
Ignition loss (mass%) = {(W-W ₁ )/(W-W _R )} x 100

<Measurement of compression recovery rate>
The recovery rate at 50% compression (compression recovery rate) was obtained by setting the sample thickness to 100% and the compression rate to 50%, and compressing it to a predetermined thickness using a material testing machine (Autograph, Shimadzu Corporation) ( 2 mm/min). After the test was completed, the thickness of the sample was measured, and the compression recovery rate (%) was calculated from the following formula.
Compression recovery rate (%) = thickness after compression test/thickness before test x 100

<Compressive stress measurement>
The stress at 10% compression (compressive stress) was calculated by dividing the load value at the time of sample compression during testing by the area (longitudinal dimension and lateral dimension) determined by sample dimension measurement. For the load during compression, measure the dimensions of the sample, set the thickness of the sample to 100%, set the compression ratio to 10%, and compress to a predetermined thickness (2 mm) using a material testing machine (Autograph, Shimadzu Corporation). / min).
Compressive stress (Mpa) = measurement load (N) / sample area (mm ² )

From the results in Table 1, the nonflammable backup material of the present invention using AES of Example 1 has a bulk density, ignition loss, And it showed a compression recovery rate and compression strength equal to or higher than the same. Therefore, the incombustible backup material of the present invention is a noncombustible backup material having the same degree of heat resistance, flexibility, workability, etc. as when using RCF, and is restricted by the Ordinance on Prevention of Hazards by Specified Chemical Substances. It turned out to be unacceptable.

It should be noted that the present invention is not limited to the above embodiments. The above-described embodiment is an example, and any device having substantially the same configuration as the technical idea described in the claims of the present invention and exhibiting the same effect is the present invention. included in the technical scope of

DESCRIPTION OF SYMBOLS 1... nonflammable backup material, 2... inorganic fiber layer, 3... polyester nonwoven fabric layer,
4... Inner peripheral groove of sash, 5... Sealing material, 6... Setting block,
7... Plate glass.

Claims (8)

A noncombustible backup material loaded into the inner circumferential groove of the sash of the glass door,
At least one polyester nonwoven fabric layer and at least one inorganic fiber layer containing glass fiber and alkaline earth silicate wool are laminated and felted,
The incombustible backup material is entirely impregnated with an inter-fiber bonding material , and
When the total content of the glass fiber and the alkaline earth silicate wool in the inorganic fiber layer is 100% by mass,
The glass fiber is 80% by mass or more and 98% by mass or less, and
The alkaline earth silicate wool is 2% by mass or more and 20% by mass or less,
A nonflammable backup material characterized by being blended at a ratio of 2. The nonflammable backup material according to claim 1, wherein one polyester nonwoven fabric layer and one inorganic fiber layer are laminated and felted. 3. The nonflammable backup material according to claim 1, wherein said interfiber binder is starch. 4. The alkaline earth silicate wool according to any one of claims 1 to 3 , wherein the alkaline earth silicate wool is mainly composed of three components of _SiO2 , MgO and CaO and has the following composition. non-combustible backup material.
SiO ₂ : 73.6% by mass to 85.9% by mass
MgO: 9.0% by mass to 15.0% by mass
CaO: 5.1% by mass to 12.4% by mass
Al ₂ O ₃ : 0% by mass or more and less than 2.3% by mass Fe ₂ O ₃ : 0% by mass to 0.50% by mass
SrO: less than 0.1% by mass The nonflammable backup material according to any one of claims 1 to 4 , wherein the alkaline earth silicate wool has an average fiber diameter of 3 to 5 µm. 6. The nonflammable backup material according to any one of claims 1 to 5 , wherein said glass fiber is made of E glass. The nonflammable backup material according to any one of claims 1 to 6 , wherein the glass fibers have an average fiber diameter of 6 to 13 µm. (1) A step of laminating an inorganic fiber layer containing glass fibers and alkaline earth silicate wool on a polyester nonwoven fabric layer, and then joining the polyester nonwoven fabric layer and the inorganic fiber layer by needle punching to produce a felted mat;
(2) a step of immersing the mat in a solution containing an interfiber binder to impregnate the entire mat with the interfiber binder;
(3) a step of heat-press molding the mat impregnated with the inter-fiber binder; and (4) a step of heat-drying the heat-press-molded mat.
and
When the total content of the glass fiber and the alkaline earth silicate wool in the inorganic fiber layer is 100% by mass,
The glass fiber is 80% by mass or more and 98% by mass or less, and
The alkaline earth silicate wool is 2% by mass or more and 20% by mass or less,
A method for producing a nonflammable backup material, characterized in that it is blended at a ratio of

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