JP2812671B2 - Heat-resistant and flame-retardant film - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant and flame-retardant film. More specifically, the present invention relates to a heat-resistant and flame-retardant film having excellent heat-resistant and flame-retardant properties. The present invention relates to a fiber membrane excellent in flexibility. [0002] In recent years, there has been a strong demand for non-combustible and non-flammable synthetic resins used for materials such as building materials and interior materials, various articles such as vehicles, ships and aircraft, electric appliances and the like. The use regulations by law are also being tightened. As one of the measures, for example, Japanese Patent Publication No. Sho 55-2
Japanese Patent No. 5055 discloses a nonflammable film in which a coating layer mainly composed of chlorsulfonated polyethylene is formed on the surface of a glass fiber cloth. However, since chlorsulfonated polyethylene is expensive, this incombustible film has not been put to practical use. In recent years, various types using a silicone resin or a fluorine resin as a heat-resistant and flame-retardant coating main agent have been developed, but all are more expensive than the above-mentioned chlorsulfonated polyethylene. Requires a long time, and fluororesin has poor workability and is difficult to use as a practical processing material. For the above-described reasons, it is preferable to use a general-purpose polyvinyl chloride resin, which is flame-retardant and versatile, as the heat-resistant and flame-retardant coating main agent. [0004] The most common polyvinyl chloride resin as a coating material causes a large amount of smoke to be burned, which may make a person present at a fire site and a firefighter difficult to breathe and cause casualties. There is a problem, and therefore, it is necessary to further increase the non-combustibility of the polyvinyl chloride resin and further reduce smoke emission during combustion as much as possible. Japanese Patent Publication No. 55-4582 discloses a nonflammable composition comprising a vinyl chloride resin and one or more borates, zinc compounds or iron compounds, and aluminum hydroxide and / or barium sulfate. Disclosed is a non-combustible film formed by uniformly coating on a base fabric. This film body hardly burns when a flame approaches, hardly emits smoke even when ignited, and is widely used as a sheet having desired waterproofness and strength. It can be used for applications. [0006] However, since this film uses a non-combustible glass fiber fabric as a base fabric, its non-combustibility is excellent, but its weight (basis weight) is large and it is inconvenient to use and handle. Since it is difficult to sew and has low bending resistance, there are problems such as breakage easily during use and tearing from perforations. [0007] Therefore, it has sufficient heat-resistant flame retardancy for practical use, withstands violent vibration, fluttering, or repeated bending, is easy to sew, and does not tear from perforations. The appearance of membranes is strongly desired. SUMMARY OF THE INVENTION The present invention has satisfactory heat-resistant flame retardancy, is easy to sew, has good bending resistance, and is resistant to tearing from perforations. Provide a flame-retardant film. The heat-resistant and flame-retardant film of the present invention comprises a base fabric made of a cross-woven fabric of a yarn made of inorganic fibers and a yarn made of organic fibers, and this cross-woven base fabric. At least one of
Formed on the surface and comprising a vinyl chloride resin
A heat-resistant and flame-retardant coating layer of 300 g / m ² , wherein the mixed weight ratio of inorganic fiber yarn to organic fiber yarn in the base fabric is 1
0:90 to 70:30. The inorganic fiber used for the base fabric of the heat-resistant and flame-retardant membrane of the present invention can be selected from asbestos fiber, ceramic fiber, silica fiber, glass fiber, carbon fiber and metal fiber. Organic fibers used for the base fabric include natural fibers such as cotton and hemp, regenerated fibers such as viscose rayon and cupra, and semi-synthetic fibers such as di- and tri-acetate fibers. And synthetic fibers such as nylon 6, nylon 66, polyester (such as polyethylene terephthalate) fibers, aromatic polyamide fibers, acrylic fibers, polyvinyl chloride fibers, polyolefin fibers, and insolubilized or hardly soluble polyvinyl alcohol fibers. Can be. The fibers in the base fabric may be ordinary yarns, such as spun short fiber yarns, long fiber yarns, split yarns, tape yarns, bulky yarns, and the like, and the base fabrics may be made of the above inorganic materials. It is a cross-woven fabric of fiber yarns and organic fiber yarns. Such a cross-woven fabric exhibits surprisingly good sewing part strength and bending resistance despite containing inorganic fiber yarns. In addition, the form of the fiber is preferably a long fiber (filament) having a small elongation with respect to stress, and a plain woven fabric is preferably formed. However, there is no particular limitation on the weave structure and its form. The organic fiber yarn is useful for maintaining the mechanical strength of the obtained heat-resistant and flame-retardant membrane at a high level. The breaking elongation of the organic fiber is preferably 10% or less, more preferably 7% or less, and about 5 to 0.5%. It is more preferable to increase the strength. When glass fiber is used, there is no particular limitation on the type and thickness of the glass fiber.
What is called a beta yarn of μm, especially about 3 μm, has been awarded. The base fabric used in the present invention is made of a cross-woven fabric of a yarn made of inorganic fibers and a yarn made of organic fibers, and there is no particular limitation on the structure, basis weight, and the like of the cross-woven fabric. . In the heat-resistant and flame-retardant film of the present invention, it is preferable that the organic fibers contained in the base fabric include heat-resistant organic synthetic fibers having a melting point of 300 ° C. or higher or a thermal decomposition point.
Polymers forming such high melting point or high thermal decomposition point fibers include those shown in Tables 1 to 5. [Table 1] [Table 2] [Table 3] [Table 4] [Table 5] Among the heat resistant polymers shown in Tables 1 to 5, polymetaphenylene isophthalamide and polyparaphenylene terephthalamide are particularly common, and Teijin Limited's "HM-50" is used as a para-aramid fiber other than the above. "Can also be used. Aromatic polyamides useful for such fibers are:
Also, at least 50 mol% of the following formulas (I) and (II): It is preferable to have at least one selected from the units represented by the following as the main repeating unit. In the above formulas (I) and (II), the divalent aromatic group represented by Ar ₁ and Ar ₂ is represented by the following formula: Is preferably selected from the aromatic residue group represented by These aromatic residues may contain an inert substituent such as a halogen, an alkyl group, a nitro group and the like. Generally, the aromatic polyamide is represented by the following formula: Those having a repeating unit represented by the following formula as a main component are more preferable. These heat-resistant organic synthetic fibers generally have an elongation at break of 10% or less, and exhibit high strength. Therefore, not only from the viewpoint of heat resistance but also from the viewpoint of improving the strength utilization rate of the film, a high-strength film is required. It is very preferable to obtain. As the heat-resistant organic synthetic fibers, in addition to the above, fluorine-based fibers and other fibers can be used as long as they have a melting point or a thermal decomposition point of 300 ° C. or higher. The mixed weight ratio of the inorganic fiber yarn to the organic fiber yarn in the base fabric of the present invention is in the range of 10:90 to 70:30. When the content of the inorganic fiber yarn is less than 10% by weight, the flame retardancy of the obtained film is insufficient, and when the content of the organic fiber yarn is less than 30% by weight, the obtained film is bent. Insufficient strength. The organic fiber preferably contains at least 25% by weight of the heat-resistant organic synthetic fiber, more preferably 30 to 100% by weight, and more preferably 50 to 100% by weight. Is even more preferred. Further, in order to promote adhesion and other performances between the base fabric and the heat-resistant and flame-retardant coating layer, low heat-resistant fibers having a melting point or a thermal decomposition point lower than 300 ° C. are contained in the organic fibers. Is also good. In this case, there is no particular limitation on the low heat resistant fibers to be mixed. However, the mixing ratio of the low heat-resistant fiber to be mixed is preferably 70% or less, more preferably 50% or less, based on the total weight of the fibers in the base fabric. When the mixed weight ratio of the inorganic fiber yarn and the organic fiber yarn is in the range of 70:30 to 10:90, the obtained film has good flame retardancy and the organic fiber is a heat-resistant organic fiber. It is preferred, but not limited, to be selected from synthetic fibers. In the case where the mixing weight ratio is in the range of 50: 550 to 10:90, when the mixing ratio of the organic fiber yarns is increased, heat-resistant organic synthetic fibers are used as the organic fibers, and the ratio of the amount used may be increased. Preferably, when the mixed weight ratio of the inorganic fiber yarn to the organic fiber yarn is smaller than 20:80, it is more preferable that 100% of the organic fibers are heat-resistant organic synthetic fibers. For the heat-resistant and flame-retardant coating layer, a compounding agent described later may be compounded in the polyvinyl chloride resin. In the present invention, the polyvinyl chloride resin used for forming the heat-resistant and flame-retardant coating layer is, for example, a vinyl chloride homopolymer, a vinyl chloride-vinyl acetate copolymer, or a vinyl chloride-ethylene copolymer. And a vinyl chloride copolymer such as a copolymer obtained by graft-polymerizing vinyl chloride on a vinyl chloride-ethylene-vinyl acetate copolymer. The vinyl chloride resin applied to the present invention includes:
For example, smoke reducing agents such as borates and zinc compounds, and conventionally known flame retardants such as aluminum hydroxide, antimony tri (pentoxide), and barium sulfate, as well as commonly used plasticizers (especially flame retardant plasticizers) ), Stabilizers, flame retardants, fillers, pigments and other additives. The borates used as smoke reducing agents include calcium borate, magnesium borate, barium borate, etc., zinc compounds include zinc oxide and zinc carbonate, and iron compounds include oxalic acid. Ferrous iron, fumaric acid ferrous
Iron, black iron oxide and the like are suitable. Examples of the plasticizer include phthalic acid esters such as dioctyl phthalate, diisodecyl phthalate and dibutyl phthalate; flame-retardant plasticizers composed of aliphatic dibasic acid esters such as dioctyl adipate and dioctyl sebacate; Epoxy plasticizers such as soybean oil and epoxidized linseed oil are used. Examples of the flame retardant include paraffin chloride, aliphatic, cycloaliphatic or aromatic halogen compounds, tricresyl phosphate, tris-2,3-dibromopropyl phosphate and tris-2,3. Dichloropropyl phosphate and the like are used, and as the filler, calcium carbonate, silica, aluminum silicate and the like are suitable. The vinyl chloride resin composition applied to the base fabric is preferably used as a paste, a film or the like. The paste is obtained by diluting the resin composition with a nonflammable organic solvent and impregnating the base fabric. Alternatively, the film is applied using knife coating, roll coating, or the like, and the film is attached to a base fabric mainly using a calender.
Normally, after impregnating or applying and fixing the paste on the base cloth, a film is stuck on one or both sides of this base cloth, and the total amount of resin applied to the base cloth can be regulated to 100 to 300 g / m ^2. preferable. The paste is uniformly impregnated and applied to the base cloth,
After sufficiently penetrating into the yarn, it is dried at about 100 ° C. to 150 ° C. for about 1 to 5 minutes, and further heat-treated in a high temperature atmosphere of 150 ° C. to 200 ° C. to be gelled. Further, the same resin composition film is usually adhered to one or both sides of the base fabric. The film is 0.04-0.20mm
It is of a uniform thickness and can be attached to the base fabric by heating and pressing using a calender. The weight of the resin composition adhered to the entire base fabric is in the range of 100 to 300 g / m ² . The weight of the heat-resistant flame-retardant coating layer containing polyvinyl chloride resin is 100 g / m ²
If less than, it is difficult to completely cover the base cloth, and
If it exceeds 300 g / m ² , there is a danger that the amount of resin contained in the base fabric becomes excessive, which in turn causes smoke during combustion and an increase in heat generation. The heat-resistant and flame-retardant film obtained in this manner has low smoke and heat generation during combustion, and is JIS-A-1321 (1975).
In the surface test in the “flame retardancy test method for building interior materials and construction methods” specified in, the smoke emission coefficient is 120 or less, sometimes 60 or less. Also, since the base cloth is uniformly coated with a continuous film, at least 15
A good heat-resistant and flame-retardant film body that can withstand the water pressure of a 00 mm water column and has appropriate strength can be obtained. The determination of the flame resistance and the waterproof test of the membrane according to the present invention are carried out as follows. B) Judgment of flame resistance A base material test and a surface test are performed based on the flame retardancy test method shown in JIS-A-1321 (1975). (Building Standards Law enforcement order, quasi-nonflammable, flame-retardant, surface test, Ministry of Construction Notice 3415). The specimen in the surface test has no melting and cracking, no deformation and no generation of toxic gas, the residual flame time is less than 30 seconds, the exhaust temperature curve does not exceed the standard temperature curve, and the smoke emission coefficient per unit area (CA) Was determined. B) Waterproofness The water level (mm) at the time when water droplets came out from three places on the back side of the test piece was measured using the 5.24.1.A method of JIS-L-1079 test method of chemical fiber fabric. The heat-resistant and flame-retardant coating layer is formed mainly of the above-mentioned polyvinyl chloride resin, and a heat-resistant inorganic additive other than alkali titanate is preferably used in an amount of 1 to 300 parts by weight based on the weight of the polyvinyl chloride resin. %, More preferably 10-250
%. The heat-resistant inorganic additive can be selected from inorganic smoke-reducing agents, inorganic flame retardants, silica-based additives, asbestos fibers, mica, high-refractive-index inorganic compounds, and endothermic inorganic compounds. The heat-resistant inorganic additive serves to reinforce the polyvinyl chloride layer. For example, various inorganic substances such as titanium oxide, mica, alumina, talc, glass fiber powder, rock wool fine fiber, silica powder, and clay are used. May be included. When it is desired to provide the obtained sheet with surface smoothness, so as not to impair the surface smoothness of the sheet,
As the heat-resistant inorganic additive, it is generally preferable to use a fine powder having a particle size of 50 μm or less. Further, the heat-resistant flame-retardant coating layer of the present invention may contain a high refractive index inorganic compound or an endothermic inorganic compound as described above. High refractive index inorganic compounds have excellent shielding performance against radiant heat, and endothermic inorganic compounds are heated at this contact surface when they come into direct contact with slag during welding or fusing. Lower. Therefore, the above-mentioned inorganic compound can suppress the collapse and penetration breakdown of the coating layer of the present invention, and can further protect the film substrate. The high refractive index inorganic compound useful in the present invention may be any compound having a refractive index of 1.5 or more, and particularly preferably a compound having a specific gravity of 2.8 or more. There is something. Powder of crushed natural or synthetic minerals such as 2) Fine powders or granules, fibrous materials or foams of frit or fused phosphate or other similar solid solutions obtained as a solid solution of high refractive glass or phosphate rock and snake ore. As the endothermic inorganic compound, calcined gypsum,
Alum, calcium carbonate, aluminum hydroxide, hydrosalcite aluminum silicate, etc.
Endothermic inorganic compounds such as a carbon dioxide release type, a decomposition endothermic type, and a phase change type can be exemplified. In the present invention, the above-mentioned heat-resistant inorganic additives except alkali titanate, ie, the above-mentioned inorganic smoke reducing agent, inorganic flame retardant, silica-based additive, asbestos fiber, mica, high refractive index inorganic compound, and / or endothermic type When the inorganic compound is mixed and dispersed in the polyvinyl chloride resin, a preferable coating mixture for a film structure according to the present invention is obtained. As a method for preparing the mixed dispersion, all known means can be used. In addition, in the coating mixture, a dispersant and a defoaming agent for uniformly dispersing each component, a coloring agent for adjusting color and mechanical strength, a resin powder, a flame retardant, a metal powder, and the like. Various fillers can be freely mixed. It is preferable to mix metal powder such as copper powder, nickel powder, brass powder, and aluminum powder from the viewpoint of improving the surface heat reflection effect and the penetration suppressing effect. As a method of coating the surface of the base fabric with the heat-resistant and flame-retardant coating layer, a method of applying the coating mixture to the surface of the base fabric by spray coating, brush coating, roll coating, or the like, or a method of coating the coating mixture. Is applied to the surface of the base fabric, or the base fabric is immersed in a coating mixture for impregnation. Further, two or more of these methods may be used in combination. The mixing ratio of the polyvinyl chloride resin with the high refractive index inorganic compound, the inorganic smoke suppressant, the inorganic flame retardant, the silica-based additive, the asbestos fiber, the mica, and / or the endothermic inorganic compound is determined by the amount of the polystyrene used. Although it depends on the type and particle size of the vinyl chloride resin and the inorganic compound, generally, when the content of the heat-resistant inorganic additive is high, the heat-resistant flame retardancy of the obtained coating layer is improved. However, if the content of the polyvinyl chloride resin is too small, the strength of the coating layer is insufficient, so that when used as a heat-resistant and flame-retardant film, the coating layer is cracked or the coating layer peels off from the base fabric. And the like. Accordingly, in the present invention, the polyvinyl chloride resin 1
400 when adding heat-resistant inorganic additives to 00 parts by weight
Although the amount can be limited to the range of 1 part by weight, the range of 1 to 300 parts by weight is usually preferable. Some or all of these heat-resistant inorganic additives can be replaced by commonly used inorganic pigments, fillers for increasing the amount of inorganic substances, inorganic powders for imparting flame retardancy, etc. It is preferably at most 400 parts by weight, more preferably at most 300 parts by weight, per 100 parts by weight of the vinyl resin. In order to further improve the effect of the present invention, a flame retardant may be used in combination. The flame retardant used here is not particularly limited. For example, organic flame retardants such as phosphate ester type, organic halogen compound type, phosphazene compound type, calcined gypsum, alum, calcium carbonate, hydroxide Endothermic decomposition type inorganic compounds and antimony compounds (antimony tri (pentanoate)) composed of inorganic compounds such as aluminum, hydrotalcite-type aluminum silicate, etc. and inorganic compounds such as water of crystallization type, carbon dioxide release type, decomposition endothermic type and phase change type And other inorganic flame retardants. For the purpose of improving the adhesion and durability between the base fabric and the coating layer, an adhesive substance may be interposed between them.
In this case, it is not necessary to intervene particularly thickly to improve the adhesive strength. The adhesive substance is not used for forming a film, and therefore, a substance known as an adhesive can be used. For example, amino groups, imino groups, ethyleneimine residues, acrylates containing alkylenediamine residues, acrylates containing aziridinyl groups, aminoester-modified vinyl polymers, aromatic epoxy adhesives, amino nitrogen-containing methacrylate polymers, and others An adhesive may be used in combination. In addition, a resin of the same quality as the resin constituting the fiber base fabric, such as polyamideimide or polyimide, or an RFL-modified substance can be arbitrarily selected and used as the adhesive. In the heat-resistant and flame-retardant film of the present invention, the heat-resistant and flame-retardant coating layer may be formed only on one side, or may be formed on both sides to compensate for the low weather resistance of the base fabric. Often,
Depending on the conditions of use, double-sided formation may be an essential condition. On the other side, depending on the performance required for the membrane, natural rubber, neoprene rubber, chloroprene rubber, silicone rubber, fluorine rubber, Hypalon and other synthetic rubbers, or ethylene-vinyl acetate copolymer (EVA) resin,
Acrylic resin, silicone resin, fluorine resin, urethane resin, polyester resin, and other synthetic resins can also be used. In this case, these resins need to be flame retarded. The heat-resistant and flame-retardant film of the present invention may be formed into a tape or a strip, or a wide film may be cut into a tape or a strip. The heat-resistant and flame-retardant film of the present invention may be used in combination with another material, for example, a foam, a mat or a net. The heat-resistant and flame-retardant film of the present invention may be covered or wound around a material to be protected, for example, an electric wire. EXAMPLES The heat-resistant and flame-retardant film of the present invention will be further described with reference to examples. In Examples 1 to 5 and Comparative Examples 1 and 2 , a cloth having the following structure was used as a base cloth. Fabric of Comparative Example 1 Fabric A: Use of glass fiber Turkish satin weave: Fabric of Comparative Example 2 Fabric B: polyester spun yarn plain woven fabric Fabric of Example 1 (Fabric 1): In the glass fiber fabric of the fabric A, the glass fiber yarns were added at a rate of one per 25.4 mm to a polyester filament of 1000 d / 14.
Replaced by 8f yarn. Fabric of Example 2 (Fabric 2): The structure of Fabric A was arranged in the order of 10 glass fiber threads and 1 polyester thread to form a fabric. Fabric of Example 3 (Fabric 3): In the structure of Fabric A, two glass fiber yarns / one polyester yarn / two glass fiber yarns / aromatic polyamide fiber (Kevlar) yarn (1000d / 148f) The fabric was arranged in the order of one piece. Fabric of Example 4 (Fabric 4): In the structure of Fabric A, a glass fiber yarn and a Kevlar yarn were alternately arranged. Fabric of Example 5 (Fabric 5): In the structure of Fabric A, two glass fiber yarns and eight Kevlar yarns were arranged in this order. Each of the above base fabrics was treated with the following resin composition. The paste of the above resin composition was diluted with trichlene, the diluted solution was impregnated into a base fabric by a dipping method, squeezed, dried at 150 ° C. for 2 minutes to disperse the diluent, and then dried at 185 ° C. for 1 hour. Heat treatment for 70 minutes, and apply 70 g /
m ² . Next, using a straight PVC, a film made of the same resin composition as described above was prepared by a calendar, and this was attached to one surface of a PVC resin-impregnated and fixed base fabric, and the total amount of resin held by the base fabric was 200 g / It was m ^2. Table 6 shows the results of evaluating the performance of the obtained various film bodies. [Table 6] * 1-Judgment criteria: * 2 Folding strength: Based on JIS-P-8115 (1976), "Testing method for folding strength of paper and paperboard using MIT type tester". * 3- Almost infinite * 4- Tensile strength preservation ratio of sewing joint: Nomex multifilament as a sewing thread using a singer 112W-115 industrial sewing machine (two needles, main sewing thread feeder, for tent) Using a thread (500d), sewing is performed with the number of stitches described in Table 6 by lockstitching and straight-line double stitching, and the stitched joint is observed.
In addition, the tensile strength was measured, and the storage ratio was calculated in comparison with the strength of the unsewn portion. * 5- The joint was torn during sewing. * 6-Heat resistance: Evaluated according to the following criteria based on the fire and heat insulation test described in JP-A-58-130183. Evaluation Criteria The evaluation of refractory heat insulation performance was classified into the following five types. Class A: When a 9 mm thick spark-generating steel sheet is blown, there is no through-hole that is harmful to the generated spark and fire. Class B: When a 4.5 mm thick spark-generating steel sheet is blown, there is no through hole that is harmful to the generated spark and fire. Class C: When a 3.2 mm thick steel plate for spark generation is blown, there is no through hole that is harmful to the generated sparks and fire. Class D: When a 3.2 mm thick steel plate for spark generation is blown, through holes harmful to fire prevention are generated. Class E: Flames occur when a 3.2mm thick steel plate for spark generation is blown. (Commercial asbestos paper (3A class) was Class E.) As shown in Table 6, when the conventional organic fiber was 100% (Comparative Example 2), the heat-resistant and flame-retardant coating layer was formed. Even if it is formed, its flame resistance is insufficient and it is rejected. In the case of 100% glass fiber (Comparative Example 1), it is nonflammable, but has a low tensile strength storage rate at the bent or sewn joint. When organic fibers are used in combination, the bending resistance is improved and the tensile strength preservation rate of the sewn joint is also improved. Since the membrane is usually sewn and used for use, this property is extremely preferable and has practical value. As clearly shown in Table 6, the conventional non-combustible film of Comparative Example 1 has low bending strength and is not suitable for applications where bending is severe or where vibration or fluttering is severe. . In addition, the sewing performance is low, and if the number of needles is larger than about 25 pitch / 10 cm in order to increase the tensile strength of the sewing joint, the tensile strength of the joint decreases, and eventually the sewing machine is torn by the sewing needle. I will. However, the heat-resistant and flame-retardant membranes of the present invention (Examples 1 to 5) exhibited good flame retardancy, non-combustibility, folding strength and sewing properties, and a preservation rate of the tensile strength of the sewing joint. . The heat-resistant and flame-retardant film according to the present invention has good heat-resistant and flame-retardant properties, and is lightweight and tough, and has a resistance to repeated bending, sewing, and the like. In particular, it is excellent in preventing tearing of perforations at the suturing portion. For this reason, the heat-resistant and flame-retardant film of the present invention is used in building materials and interior materials for fire-resistant clothing, gyms, warehouses, markets, amusement arcades, factories, parking lots, and various accommodation facilities where fires are expected. It is suitable for applications such as tents, awnings, blinds, sheets, partitions, and other materials that are subject to frequent bending, vibration, and fluttering.

Claims (1)

(57) [Claims] A base fabric made of a cross-woven fabric of a yarn made of an inorganic fiber and a yarn made of an organic fiber;
Formed on the surface and comprising polyvinyl chloride resin 1
Having a heat-resistant and flame-retardant coating layer of 00 to 300 g / m ² , wherein the mixed weight ratio of the inorganic fiber yarn to the organic fiber yarn in the base fabric is in the range of 10:90 to 70:30. A heat-resistant and flame-retardant film body characterized by the following. 2. The membrane according to claim 1, wherein the inorganic fiber is selected from asbestos fiber, ceramic fiber, silica fiber, glass fiber, carbon fiber, and metal fiber. 3. The film according to claim 1, wherein the heat-resistant and flame-retardant coating layer further contains a heat-resistant inorganic additive other than alkali titanate. 4. The heat-resistant inorganic additive contained in the heat-resistant flame-retardant coating layer is selected from an inorganic smoke reducing agent, an inorganic flame retardant, a silica-based additive, asbestos fiber, mica, a high-refractive-index inorganic compound and an endothermic inorganic compound. Item 7. A film according to Item 3. 5. The film according to claim 3, wherein the content of the heat-resistant inorganic additive is in the range of 1 to 300% based on the weight of the polyvinyl chloride resin.