JPH04226342A - Heat-resistant, flame-retardant film member - Google Patents

Abstract

PURPOSE:To enhance sewing properties and flexing resistance and improve the breaking strength of perforation while the heat resistance and flame retardance of a heat-resistant, flame-retardant film member are kept at a high level. CONSTITUTION:A heat-resistant, flame-retardant film member whose base fabric consists of inorganic fibers and organic fibers, the mixture weight ratio of the inorganic fibers to the organic fibers being 10:90-95.5:0.5, and on which base fabric is formed a heat-resistant, flame-retardant coating layer mainly composed of a polyvinyl chloride resin and, as necessary, containing a silicic additive and an inorganic additive selected from a mica inorganic compound with high refractive index and an endothermic type inorganic compound.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a heat-resistant and flame-retardant membrane, and more specifically, to a fiber membrane that has excellent heat-resistant and flame-retardant properties, as well as excellent sewing and bending resistance. It is.

0002

[Prior Art] In recent years, there has been a strong demand for synthetic resins used in building materials, interior decoration materials, various items for vehicles, ships, aircraft, electrical appliances, etc. to be made nonflammable and flame retardant, and this is required by law. Regulations on its use have also been strengthened.

[0003] As one of the countermeasures, for example,
Japanese Patent No. 25055 discloses a nonflammable film body in which a coating layer containing chlorosulfonated polyethylene as a main ingredient is formed on the surface of a glass fiber cloth. However, because chlorosulfonated polyethylene is expensive, this nonflammable membrane has not been put into practical use. In recent years, various types of heat-resistant and flame-retardant coatings using silicone resins or fluororesins as the main ingredient have been developed, but they are all more expensive than the chlorosulfonated polyethylene mentioned above, and in addition, silicone resins are difficult to crosslink and form a coating. It takes a long time to process, and fluororesin has poor workability, making it difficult to use as a practical processing material. For the above reasons, it is preferable to use polyvinyl chloride resin, which is flame retardant itself and has versatile properties, as the main ingredient for the heat-resistant and flame-retardant coating.

[0004] Polyvinyl chloride resin, which is the most common coating material, produces a large amount of smoke when burned, making it difficult for people present at the fire scene and firefighters to breathe, which can result in casualties. Therefore, it has become a challenge to further improve the nonflammability of polyvinyl chloride resin and to further reduce smoke generation during combustion as much as possible.

[0005] Japanese Patent Publication No. 55-4582 discloses that a composition consisting of a vinyl chloride resin, one or more of borate, zinc compound or iron compound, and aluminum hydroxide and/or barium sulfate is used as a non-combustible material. The present invention discloses a nonflammable membrane formed by uniformly coating a base fabric. This membrane hardly combusts even when a flame approaches, and even if it ignites, it emits almost no smoke.Furthermore, it can be widely used as a sheet-like material with the desired waterproofness and strength. It can be used for various purposes.

However, since this membrane uses nonflammable glass fiber fabric as the base fabric, although its nonflammability is excellent, its weight (fabric weight) is large, making it inconvenient to use and handle. Since it is difficult to sew and has low bending resistance, it has problems such as being easily broken during use and easily tearing from perforations.

[0007] Therefore, a heat-resistant and flame-retardant material that maintains sufficient heat-resistance and flame retardancy for practical use, can withstand strong vibrations, flapping, or repeated bending, is easy to sew, and does not tear from perforations. The appearance of a membranous body is strongly desired.

[0008]

[Problems to be Solved by the Invention] The present invention has satisfactory heat and flame retardant properties, is easy to sew, has good bending resistance, and is resistant to tearing from perforations. Provides a membrane body.

[0009]

[Means for Solving the Problems] The heat-resistant and flame-retardant membrane of the present invention comprises a base fabric containing inorganic fibers and organic fibers, and formed on at least one surface of the base fabric, and a heat-resistant and flame-retardant coating layer comprising a vinyl chloride resin, and the weight ratio of inorganic fiber to organic fiber in the base fabric is 10:9.
It is characterized by being within the range of 0 to 99.5:0.5.

0010

[Function] The inorganic fibers used for the base fabric of the heat-resistant and flame-retardant membrane of the present invention can be selected from asbestos fibers, ceramic fibers, silica fibers, glass fibers, carbon fibers and metal fibers.

The organic fibers used for the base fabric include natural fibers such as cotton and linen, regenerated fibers such as viscose rayon and cupro, semi-synthetic fibers such as di- and tri-acetate fibers, etc. and synthetic fibers, such as nylon 6, nylon 66, polyester (polyethylene terephthalate, etc.) fibers, aromatic polyamide fibers, acrylic fibers, polyvinyl chloride fibers, polyolefin fibers, and insoluble or poorly soluble polyvinyl alcohol fibers. I can do it.

[0012] The fibers in the base fabric may be in any form such as ordinary yarns, such as short fiber spun yarns, long fiber yarns, split yarns, tape yarns and bulky yarns, and the base fabric may be woven fabrics, It may be a knitted fabric, a nonwoven fabric, or a composite fabric thereof. However, in consideration of the strength and bending resistance of the sewn portion, a woven or knitted fabric is preferable as the base fabric, and a woven fabric is more preferable. Further, as for the form of the fibers, it is preferable that the fibers are in the form of long fibers (filaments) which have little elongation under stress, and are preferably in the form of a plain woven fabric. However, there are no particular limitations on the weaving structure or its form. Organic fibers are useful for maintaining the mechanical strength of the resulting heat-resistant and flame-retardant membrane at a high level.

[0013] Furthermore, the elongation at break of the organic yarn is 10% or less, preferably 7% or less, and an elongation of about 5 to 0.5% balances the elongation performance of the inorganic fiber and improves the breaking strength utilization rate. More preferred for increasing strength.

[0014] When glass fiber is used, there are no particular limitations on its type or thickness, but it generally has a thickness of about 2 to 1
Beta yarns with a diameter of about 0 μm, particularly about 3 μm, are widely used.

[0015] There is no particular limitation on the form in which the inorganic fibers and organic fibers are mixed in the base fabric, and they may be mixed yarns, mixed woven or knitted fabrics, mixed twisted yarns, mixed bulky yarns, or drawn yarns of different types of fiber yarns. Alternatively, inorganic fibers and organic fibers may be woven or knitted separately and then used together to form a base fabric.

[0016] In the heat-resistant and flame-retardant membrane 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. Examples of polymers that form such high melting point or high 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. H.M.
-50'' etc. can also be used.

Aromatic polyamides useful in such fibers include:
In addition, at least 50 mol% of the following formulas (I) and (II)
):

Preferably, it has at least one type of unit selected from the following as the main repeating unit.

In the above formulas (I) and (II), A
The divalent aromatic group represented by r1 and Ar2 has the following formula:

Preferably, it is selected from the group of aromatic residues represented by the following formula. These aromatic residues may contain inert substituents such as halogen, alkyl groups, and nitro groups.

Generally, the aromatic polyamide has the following formula:

It is more preferable to have a repeating unit represented by the following formula as a main component. The elongation at break of these heat-resistant organic synthetic fibers is generally 10% or less, and they also exhibit high strength. Therefore, high-strength membranes are required not only from the standpoint of heat resistance but also from the standpoint of improving the strength utilization rate of the membrane. It is extremely preferable to obtain

In addition to the above-mentioned heat-resistant organic synthetic fibers, fluorine-based fibers and other fibers can also be used as long as they have a melting point or decomposition point of 300° C. or higher.

The weight ratio of inorganic fiber to organic fiber in the base fabric of the present invention is within the range of 10:90 to 99.5:0.5. If the content of inorganic fibers is less than 10% by weight, the flame retardancy of the obtained membrane will be insufficient, and if the content of organic fibers is less than 0.5% by weight, the flexural strength of the obtained membrane will be insufficient. It becomes insufficient. Further, 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. It is even more preferable.

[0023] In addition, in order to promote adhesion and other properties between the base fabric and the heat-resistant and flame-retardant coating layer, the organic fibers are heated at 300°C.
It may also contain low heat resistant fibers having a lower melting point or decomposition point. In this case, there are no particular limitations on the low heat resistant fibers to be mixed. However, the mixing rate of the low heat resistant fibers 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.

[0024] The mixing ratio of inorganic fiber and organic fiber is 99.5:
When the ratio is within the range of 0.5 to 70:30, the flame retardance of the resulting membrane is significantly excellent. The organic fibers are preferably selected from heat-resistant organic synthetic fibers, but are not limited thereto. When the mixing weight ratio of inorganic fibers and organic fibers is in the range of 70:30 to 10:90, the resulting membrane has good flame retardancy, and the above weight ratio is 50:
In the range of 50 to 10:90, when the mixing ratio of organic fibers becomes high, it is preferable to use heat-resistant organic synthetic fibers as the organic fibers and increase the ratio of the amount used. When the ratio is less than 20:80, it is more preferable that 100% of the organic fibers are heat-resistant organic synthetic fibers. The heat-resistant and flame-retardant coating layer may be formed by blending the compounding agents described later with the polyvinyl chloride resin.

In the present invention, the polyvinyl chloride resin used to form the heat-resistant and flame-retardant coating layer includes, for example, vinyl chloride homopolymer, vinyl chloride-vinyl acetate copolymer, and vinyl chloride-ethylene copolymer. Examples include vinyl chloride copolymers such as a copolymer obtained by graft polymerizing vinyl chloride onto a vinyl chloride-ethylene-vinyl acetate copolymer.

[0026] The vinyl chloride resin applied to the present invention includes:
For example, in addition to smoke reducing agents such as borates and zinc compounds, and conventionally known flame retardants such as aluminum hydroxide, antimony tri(5) oxide, and barium sulfate, commonly used plasticizers (
In particular, flame retardant plasticizers), stabilizers, flame retardants, fillers, pigments and other additives may also be added.

Borates used in smoke reducing agents include calcium borate, magnesium borate, barium borate, etc., zinc compounds include zinc oxide, zinc carbonate, etc., and iron compounds include oxalate, etc. Ferrous iron, ferrous fumarate, black iron oxide, etc. are suitable.

[0028] As a plasticizer, flame-retardant plasticizers consisting of phthalate esters such as dioctyl phthalate, diisodecyl phthalate, and dibutyl phthalate, aliphatic dibasic acid esters such as dioctyl adipate and dioctyl sebacate, or epoxy Epoxy plasticizers such as epoxidized soybean oil and epoxidized linseed oil are used.

In addition, flame retardants include chlorinated paraffin, aliphatic, cycloaliphatic or aromatic halogen compounds, tricresyl phosphate, tris-2,3-dibromopropyl phosphate, tris-2,3 - Dichloropropyl phosphate, etc. are used, and calcium carbonate, silica, aluminum silicate, etc. are suitable as fillers.

The vinyl chloride resin composition applied to the base fabric is preferably used as a paste, film, etc. The paste is prepared by diluting the resin composition with a nonflammable organic solvent and impregnating the base fabric with the diluted resin composition. Or knife coating,
It is applied using roll coating or the like, and the film is mainly attached to the base fabric using a calendar machine. It is usually preferable to impregnate or apply and fix the paste onto a base fabric and then affix a film to one or both sides of the base fabric so that the total amount of resin applied to the base fabric is regulated to 100 to 300 g/m 2 .

The paste is uniformly impregnated and applied to the base fabric,
After sufficiently permeating into the yarn, the temperature is about 100°C to 150°C.
Dry at ℃ for about 1 to 5 minutes, and then dry at 150℃ to 2
It is gelled by heat treatment in a high temperature atmosphere of 00°C.

[0032] Also, the same resin composition film is usually attached to one or both sides of the base fabric. Film is 0.04~0
．． It has a uniform thickness of about 20 mm and is attached to the base fabric by heating and pressing using a calendar machine. The weight of the resin composition fixed to the entire base fabric is 100 to 300 g/m2
It is preferable that it is in the range of . If it is less than 100g/m2, it is difficult to completely cover the base fabric, and 3
If it exceeds 00 g/m2, the resin content will be excessive with respect to the base fabric, and there is a danger that it will cause smoke generation and an increase in calorific value during combustion.

The thus obtained heat-resistant and flame-retardant film exhibits low smoke emission and calorific value during combustion, and meets JIS-A-1321.
(1975), the smoke generation coefficient is
It is 120 or less, some 60 or less, or 30 or less. In addition, since the base fabric is uniformly covered with a continuous film, it can withstand water pressure of at least 1500 mm of water column.
Further, a film body having appropriate strength and good heat resistance and flame retardancy can be obtained.

[0034] The flame retardant property judgment and waterproof test of the membrane according to the present invention are carried out as follows. b) Flame retardant judgment JIS-A
A base material test and a surface test are conducted based on the flame retardancy test method shown in J.-1321 (1975). (Enforcement Ordinance of the Building Standards Act, semi-flammable, flame retardant, surface test, Ministry of Construction Public Notice No. 3415). The specimen in the surface test has no melting, no cracks, no deformation, no generation of toxic gas, afterflame time is less than 30 seconds, the exhaust temperature curve does not exceed the standard temperature curve, and the smoke generation coefficient per unit area (
CA).

B) Waterproof JIS-L-1079 Chemical Fiber Fabric Test Method 5.24.1. Using Method A, the water level (mm) when water droplets appeared from three locations on the back side of the test piece was measured.

The heat-resistant and flame-retardant coating layer is formed using the above-mentioned polyvinyl chloride resin as a main component, and preferably contains a heat-resistant inorganic additive other than alkali titanate in an amount of 1 to 300% by weight based on the weight of the polyvinyl chloride resin. %, more preferably 10
It is preferable that it is added in an amount of ~250%. Inorganic additives can be selected from inorganic smoke reducers, inorganic flame retardants, silica additives, asbestos fibers, mica, high refractive index inorganic compounds, endothermic inorganic compounds, and the like.

The above-mentioned inorganic additives serve to reinforce the polyvinyl chloride layer, and include various inorganic substances such as titanium oxide, mica, alumina, talc, glass fiber powder, rock wool fine fibers, silica powder, and clay. It's okay to stay. If you want the resulting sheet to have surface smoothness,
In order not to impair the surface smoothness of the sheet, it is generally preferable to use a fine powder of 50 μm or less as the inorganic additive.

Furthermore, the heat-resistant and 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 when endothermic inorganic compounds come into direct contact with slag during welding or fusing, they are heated at this contact surface, and an endothermic reaction occurs during decomposition, lowering the temperature of the slag. lower. Therefore, the above-mentioned inorganic compound can suppress the collapse and penetration failure of the coating layer of the present invention, and can further protect the membrane base material.

[0039] The high refractive index inorganic compound useful in the present invention may have a refractive index of 1.5 or more, but those with a specific gravity of 2.8 or more are particularly suitable; examples thereof include the following: There is something. Powder of crushed natural or synthetic minerals such as 2) Fine powders or granules, fibrous materials or foams of frit or high refractive glass or molten phosphorus fertilizer obtained as a solid solution of phosphorite and snake ore or other similar solid solutions.

[0040] Also, examples of endothermic inorganic compounds include calcined gypsum,
Alum, calcium carbonate, aluminum hydroxide, hydrosalcite aluminum silicate, etc., crystal water releasing type,
Examples include endothermic inorganic compounds such as carbon dioxide releasing type, decomposition endothermic type, and phase conversion type.

In the present invention, when silica additives, asbestos fibers, mica, high refractive index inorganic compounds, and/or endothermic inorganic compounds are mixed and dispersed in polyvinyl chloride resin,
A preferred coating mixture for membrane structures according to the invention is obtained. All known means can be used to prepare the mixed dispersion. In addition, the above-mentioned coating mixture includes a dispersant and a defoaming agent for homogeneously dispersing each component, a coloring agent for adjusting color and mechanical strength, etc., resin powder, flame retardant,
Metal powder and various other fillers can be mixed freely. Incidentally, it is preferable to mix metal powder such as copper powder, nickel powder, brass powder, aluminum powder, etc. from the viewpoint of improving the surface heat reflection effect and the penetration suppressing effect.

[0042] The surface of the base fabric can be coated with a heat-resistant and flame-retardant coating layer by applying a coating mixture to the surface of the base fabric by spraying, brushing, roll coating, or the like; There is a method in which a film formed by molding is adhered to the surface of a base fabric, or a method in which the base fabric is immersed in a coating mixture and impregnated. Furthermore, two or more of these methods may be used in combination.

The blending ratio of polyvinyl chloride resin and high refractive index inorganic compound, inorganic smoke reducing agent, inorganic flame retardant, silica additive, asbestos fiber, mica, and/or endothermic inorganic compound, etc. depends on the polyvinyl chloride resin used. Although it varies depending on the type and particle size of the vinyl chloride resin and the inorganic compound, in general, as the content of the high refractive index inorganic compound and/or endothermic inorganic compound increases, the heat resistance and flame retardance of the resulting coating layer improves. However, if the content of polyvinyl chloride resin is too low, the strength of the coating layer will be insufficient, resulting in cracks in the coating layer or peeling of the coating layer from the base fabric when used as a heat-resistant and flame-retardant membrane. Such disadvantages arise.

Therefore, in the present invention, polyvinyl chloride resin
When blending a heat-resistant inorganic additive to 100 parts by weight (hereinafter referred to as parts by weight), up to 400 parts can be blended, but a range of 1 to 300 parts is generally preferred. In addition, some or all of these heat-resistant inorganic additives can be replaced with commonly used inorganic pigments, inorganic bulking fillers, inorganic powders that impart flame retardancy, etc., but the amount used is limited to polychloride. It is preferably at most 400 parts, more preferably at most 300 parts, based on 100 parts of the vinyl resin.

A flame retardant may be used in combination to further enhance the effects of the present invention. The flame retardants used here are not particularly limited, but include, for example, organic flame retardants such as phosphate ester type, organic halogen compound type, and phosphazene compound type, calcined gypsum, alum, calcium carbonate, and hydroxide. Endothermic decomposition type inorganic compounds such as aluminum, hydrotalcite-based aluminum silicate, crystal water release type, carbon dioxide gas release type, decomposition endothermic type and phase conversion type inorganic compounds and antimony compounds (tri(5) antimony oxide) There are inorganic flame retardants such as

[0046] In order to improve the adhesion and durability between the base fabric and the coating layer, an adhesive substance may be interposed between the two. In this case, there is no need to interpose the layer thicker than to improve adhesive strength. Adhesive substances are not used for film formation; therefore substances known as adhesives can be used. For example, acrylates containing amino groups, imino groups, ethyleneimine residues, alkylene diamine residues, acrylates containing aziridinyl groups, amino ester-modified vinyl polymer-aromatic epoxy adhesives, amino nitrogen-containing methacrylate polymers, etc. An adhesive may also be used. Further, a resin having the same quality as the resin constituting the fiber base fabric, such as polyamideimide or polyimide, or an RFL modified substance, etc. can be arbitrarily selected.

There are no particular limitations on the weight or thickness of the coating layer, but it is generally 10 to 1000 g/m2, preferably 50 g/m2.
A weight of ~300 g/m2 is preferred.

In the heat-resistant and flame-retardant film body of the present invention, the heat-resistant and flame-retardant coating layer may be formed only on one side, but it may be formed on both sides to compensate for the low weather resistance of the base fabric. often,
Depending on the usage situation, double-sided formation may be an essential condition. Depending on the performance required of the membrane, the other side may be made of natural rubber, neoprene rubber, chloroprene rubber, silicone rubber, fluorine rubber, Hypalon or other synthetic rubber, ethylene-vinyl acetate copolymer (EVA) resin, acrylic. Resin, silicone resin, fluororesin, urethane resin, polyester resin and other synthetic resins can also be used. In this case, these resins need to be flame retardant.

The heat-resistant and flame-retardant film of the present invention may be formed into a tape or strip, or a wide film may be cut into a tape or strip. Furthermore, the heat-resistant and flame-retardant membrane of the present invention may be used in combination with other materials such as foam, mat, or net. The heat-resistant and flame-retardant membrane of the present invention may be coated or wrapped around a material to be protected, such as an electric wire.

[0050]

[Example] The heat-resistant and flame-retardant membrane of the present invention will be further explained with reference to Examples.

Examples 1 to 5 and Comparative Examples 1 to 2 In the comparative examples, fabrics having the following structure were used as base fabrics. Fabric of Comparative Example 1 Fabric A: Turkish satin weave using glass fiber: DE150
1/2 3.3S 54 pieces/25.4mm x 51 pieces/25.4mm Fabric of Comparative Example 2 Fabric B: Polyester spun yarn plain fabric

Fabric of Example 1 (Fabric 1): In the glass fiber fabric of Fabric A, polyester filament 1000d/1 was replaced with glass fiber thread at a ratio of one thread per 25.4 mm.
It was replaced with a 48f thread. 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 prepare a fabric. Fabric of Example 3 (
Fabric 3): In the structure of fabric A, two glass fiber threads/one polyester thread/two glass fiber threads/one aromatic polyamide fiber (Kevlar) thread (1000d/148f) are arranged in the order of the fabric. And so.

Fabric of Example 4 (Fabric 4): In the structure of Fabric A, glass fiber threads and Kevlar threads were arranged alternately. Fabric of Example 5 (Fabric 5): In the structure of Fabric A, two glass fiber threads and eight Kevlar threads were arranged in this order.

Each of the above base fabrics was treated with the following resin composition.

[0055] The paste of the above resin composition was diluted with trichlene, this diluted liquid was impregnated into a base fabric by a dipping method, wrung out, dried at 150°C for 2 minutes to scatter the diluent, and then soaked at 185°C for 1 hour. The resin was heat-treated for a minute to adhere the resin to the base fabric at a rate of 70 g/m2. Next, using straight PVC, a film made of the same resin composition as above was created using a calendar, and this was pasted on one side of the PVC resin-impregnated fixing base fabric, so that the total resin content was reduced to 200% by being retained by the base fabric.
g/m2. Table 6 shows the results of evaluating the performance of the various membrane bodies obtained.

[0056]

[Table 6] Notes for Table 6: *1-Judgment criteria: *2-Folding strength: JIS-P-8115 (1976
), "Folding strength test method using MIT type tester for paper and paperboard". *3 - Almost infinite

*4 - Tensile strength retention rate of sewn joint: Using a Singer 112W-115 industrial sewing machine (two needles, lockstitch thread feed, tent use), Nomex multifilament thread (500d) was used as the sewing thread, Sewing was performed using lockstitch and two straight stitches at the number of stitches listed in Table 2, the sewn joint was observed, and its tensile strength was measured, and the retention rate was determined by comparing it with the strength of the unsewn part. Calculated.

*5-The joint was torn during sewing. *6-Heat resistance: Evaluated according to the following criteria based on the fire resistance and insulation test described in JP-A-58-130183.

Evaluation Criteria The fire resistance and heat insulation performance was graded into the following five categories. Class A: When cutting a 9mm thick spark-generating steel plate, there should be no through-holes that are harmful to the sparks that are generated and are harmful to fire prevention. Class B: When cutting a spark-generating steel plate with a thickness of 4.5 mm,
There shall be no through-holes that are harmful to sparks and cause fire prevention. Class C: When cutting a spark-generating steel plate with a thickness of 3.2 mm,
There shall be no through-holes that are harmful to sparks and cause fire prevention. Class D: When cutting a spark-generating steel plate with a thickness of 3.2 mm,
Penetration holes that are harmful to fire safety occur. Class E: When cutting a spark-generating steel plate with a thickness of 3.2 mm,
Inflammation. (Commercially available asbestos paper (Class 3A) was Class E.)

As clearly shown in Table 6, in the case of 100% conventional organic fiber (Comparative Example 1), even if a heat-resistant and flame-retardant coating layer was formed, its flame retardancy was insufficient and it was rejected. . In the case of 100% glass fiber, it is nonflammable, but the tensile strength retention rate at the folded or sewn joint is low. When organic fibers are used in combination, the bending resistance is improved and the tensile strength retention rate of the sewn joints is also improved. Since membrane bodies are usually sewn before use, this characteristic is extremely desirable and has practical value.

Furthermore, as Table 6 clearly shows, the conventional nonflammable membrane of Comparative Example 1 has low bending strength, and is not suitable for applications that require heavy bending or applications that are subject to severe vibrations or flapping. . Moreover, its sewing properties are poor, and if the number of stitches is increased to more than about 25 pitches/10 cm in order to increase the tensile strength of the sewn joint, the tensile strength of the joint decreases and it will eventually be torn by the sewing machine needle.

However, the heat-resistant and flame-retardant membranes of the present invention (Examples 1 to 5) showed good flame retardancy, non-combustibility, folding strength, seamability, and retention of tensile strength at sewn joints. .

[0063]

Effects of the Invention The heat-resistant and flame-retardant film body according to the present invention exhibits good heat-resistant and flame-retardant properties, is lightweight and strong, and has excellent resistance to repeated bending and sewing properties, especially at seams. It is also excellent in preventing tearing at the perforations. Therefore, the heat-resistant and flame-retardant film body of the present invention can be used as fire-resistant clothing, building materials and interior materials for gymnasiums, warehouses, markets, playgrounds, factories, parking lots, various accommodation facilities, etc. where fire is expected, and Suitable for materials such as tents, awnings, blinds, sheets, partitions, etc., and other applications that are subject to significant bending, vibration, flapping, etc.

Claims (7)

[Claims] 1. A base fabric comprising an inorganic fiber and an organic fiber, and a heat-resistant and flame-retardant coating layer formed on at least one surface of the base fabric and comprising a polyvinyl chloride resin. and the weight ratio of inorganic fiber to organic fiber in the base fabric is within the range of 10:90 to 99.5:0.5.
A heat-resistant and flame-retardant film body characterized by: 2. The membrane body according to claim 1, wherein the inorganic fibers are selected from asbestos fibers, ceramic fibers, silica fibers, glass fibers, carbon fibers and metal fibers. 3. The membrane body according to claim 1, wherein the organic fiber includes a heat-resistant organic synthetic fiber having a melting point or thermal decomposition point of 300° C. or higher. 4. The organic fiber comprises at least 25% by weight.
The membrane body according to claim 3, comprising the heat-resistant organic synthetic fiber. 5. The membrane body according to claim 1, wherein the heat-resistant and flame-retardant coating layer further contains a heat-resistant inorganic additive excluding alkali titanate. 6. The heat-resistant and flame-retardant coating layer further includes a heat-resistant inorganic additive, and the inorganic smoke reducing agent and inorganic flame retardant are silica-based additives, asbestos fibers, mica, and barium sulfate high refractive index inorganic compounds. and an endothermic inorganic compound.
Membrane body described in. 7. The membrane body according to claim 5, wherein the content of the heat-resistant inorganic additive is within a range of 1 to 300% based on the weight of the polyvinyl chloride resin.