JP2018192680A - Composite membrane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite film capable of preventing radioactive materials from scattering from a nuclear reactor building of a nuclear power plant and usable for a long period of time in a high radiation dose environment. SOLUTION: An organic fiber cloth having a limiting oxygen index (LOI) of 25 or more is used as a base cloth 11, and a non-combustible or flame-retardant resin coating layer 12 is formed on both surfaces thereof, and a resin coating layer 12 is formed. A composite film having a fluororesin coating layer 20 formed on at least one surface thereof and having a tensile strength of 1,000 N/inch or more in both vertical and horizontal directions. The organic fiber cloth is composed of one or more types of tissues selected from woven fabric, knitted fabric, knitted fabric or honeycomb, and the organic fiber preferably has a tensile strength of 15 cN/dtex or more, and preferably aramid fiber. Is a composite membrane. Preferred is a composite film in which the flame-retardant or non-flammable resin layer is one or more fats and oils selected from vinyl chloride resins. [Selection diagram] Figure 1

Description

  The present invention relates to a composite film for curing, and more particularly to a composite film for curing intended to prevent scattering of radioactive substances from a nuclear reactor building.

  TEPCO's Fukushima Daiichi NPS is taking measures against the so-called meltdown that nuclear fuel melts down immediately after the March 2011 tsunami. At the time of decommissioning, it is necessary to remove the melted nuclear fuel from the nuclear reactor. When removing nuclear fuel and fuel debris from the reactor building, it is necessary to take measures to prevent the radioactive material from scattering from the reactor building, and it is necessary to cure the area around the reactor building and to prevent the radioactive material from leaking outside. .

  Usually, as a film material for a curing sheet or a tent, a film material in which a soft vinyl chloride resin or the like is laminated on a cloth made of synthetic fiber such as nylon or polyester is often used. However, in places where the radiation dose is high, such as the reactor building of the Fukushima Daiichi NPS, these synthetic fibers have a problem with radiation resistance, so they deteriorate in a short period of time and have a short service life. There is a problem that must be done. Since replacement work under a high radiation dose is very difficult and there is a risk of radioactive material scattering, a long-life film material is required.

  Patent Document 1 proposes a film material in which a fluororesin film is laminated and heat-welded to a fabric using glass fibers as reinforcing fibers. However, since glass fibers are inorganic fibers, they have poor bending fatigue resistance. It has been known. When the membrane material is used outdoors for a long period of time, it repeatedly deforms due to wind flaking, so that there is a problem that the strength of the glass fiber is lowered and the membrane life is shortened.

  Patent Document 2 proposes a composite film in which a soft vinyl chloride resin base layer is formed on both front and back surfaces of a fiber fabric base fabric, and a fluororesin surface layer is formed thereon. As the fiber fabric, natural fibers (for example, cotton and hemp), synthetic fibers (for example, polyester, polyamide, polyvinyl alcohol fiber and the like), and inorganic fibers (for example, glass and carbon fiber) are disclosed. However, the exemplified natural fibers and synthetic fibers have poor radiation resistance under high radiation, and inorganic fibers have poor bending fatigue resistance.

  On the other hand, in Patent Document 3, a resin coating layer is formed on at least one surface of a fiber fabric (base fabric) as a film material suitable for use as a film material for radiation shielding water sacs in a radiation environment, and the resin A composite film in which a radiation shielding resin layer containing tungsten powder or the like is laminated on a coating layer is disclosed, and Patent Document 4 discloses a mesh as a film material for a packing material suitable for packing while grasping the contents. A composite film is disclosed in which a transparent fabric and a sheet having a large tensile elongation are laminated. However, these film materials have problems in terms of long life and combustibility necessary for use as a film material for curing.

JP 2002-210894A JP-A-6-246873 Japanese Patent Laying-Open No. 2015-224967 JP, 2006-010971, A

  The present invention has been made in view of the background of the prior art, and an object of the present invention is to provide a composite film that can prevent scattering of radioactive materials from a nuclear power plant reactor building and can be used for a long time in a high radiation dose environment. And

  As a result of studying a radiation-resistant composite film in order to solve the above-mentioned problems, the present inventors used an organic fiber fabric having a limiting oxygen index (LOI) of 25 or more as a base fabric. A composite film in which a flame-retardant resin coating layer is formed and a fluororesin coating layer is formed on at least one surface of the resin coating layer can be found to be able to solve unexpected problems at once. The invention has been completed.

  That is, the present invention is as follows.

(1) An organic fiber fabric having a limiting oxygen index (LOI) of 25 or more is used as a base fabric, a non-flammable or flame-retardant resin coating layer is formed on both sides thereof, and at least one side of the resin coating layer A composite film in which a fluororesin coating layer is formed.
(2) The composite membrane according to (1), wherein the organic fiber fabric is composed of at least one structure selected from a woven fabric, a knitted fabric, a knitted fabric, and a honeycomb-shaped product.
(3) Non-flammable or flame retardant resin coating layer is made of vinyl chloride resin, vinylidene chloride resin, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinylidene chloride copolymer, vinyl chloride / acrylic acid ester copolymer. The composite film according to (1) or (2), which is composed of at least one selected from the group consisting of:
(4) The organic fiber is a high-strength fiber, the tensile strength is 15 cN / dtex or more, and at least one selected from an aramid fiber, a polyparaphenylenebenzbisoxazole fiber, and a wholly aromatic polyester fiber The composite film in any one of said (1)-(3) containing the fiber of.
(5) The composite film according to (4), wherein the high-strength fiber is an aramid fiber.
(6) Fluorine-based resin coating layer is made of vinyl fluoride, vinylidene fluoride, ethylene trifluoride chloride, ethylene tetrafluoride, ethylene tetrafluoride / perfluoroalkoxyethylene copolymer, ethylene tetrafluoride / ethylene copolymer The composite film according to any one of the above (1) to (5), which contains at least one resin selected from a coalescence and a vinylidene fluoride / tetrafluoroethylene copolymer.
(7) The composite film according to any one of (1) to (6), wherein the composite film has a tensile strength of 1,000 N / inch or more in both the vertical and horizontal directions.

  Since the composite membrane of the present invention has high tensile fracture strength and excellent radiation resistance, it is suitable as a curing membrane material to be used for a long time under a high radiation dose. In particular, it is suitable as a film material for curing when radioactive material is prevented from scattering from the reactor building of a nuclear power plant and airtightness is ensured.

It is explanatory drawing explaining the laminated structural example of the composite film of this invention.

In the composite film according to the present invention, a non-flammable or flame-retardant resin coating layer is formed on both surfaces of a fabric (base fabric) using organic fibers, and a fluorine-based resin coating layer is further formed on at least one surface of the resin coating layer. Is formed.
FIG. 1 shows a preferred laminated configuration example. 1 is a composite film, 11 is an organic fiber fabric (base fabric), 12 is a non-flammable or flame-retardant resin coating layer, and 20 is a fluororesin coating layer.

  The preferred tensile strength of the composite film of the present invention is 1,000 N / inch or more in both the vertical and horizontal directions. If the tensile strength is 1,000 N / inch or more, damage during handling and curing can be prevented, and breakage due to scattering of sand or stones in use can be prevented.

  It is important to use organic fibers having a limiting oxygen index (LOI) of 25 or more as the organic fibers constituting the organic fiber fabric. Such a fiber is preferably used because it has the property of hardly burning and has excellent radiation resistance compared to a fiber having a limiting oxygen index of less than 25. Furthermore, if the organic fiber is a high-strength fiber and the tensile strength based on JIS L 1013: 2010 “Chemical Fiber Filament Yarn Test Method” is 15 cN / dtex or more, it is strong as a composite film without increasing the fabric weight. It is more preferable because the weight of the composite film can be reduced.

  Examples of the fabric (base fabric) made of organic fibers include those composed of at least one kind of structure selected from woven fabrics, knitted fabrics, knitted fabrics, and honeycombs. Among these fabrics, a fabric is preferable from the viewpoint of strength. The fabric structure is not particularly limited, and plain weave, twill weave, satin weave and the like can be used.

  Examples of the high-strength fibers include aramid fibers, polyparaphenylene benzbisoxazole fibers, and wholly aromatic polyester fibers, and at least one selected from the group consisting of these high-strength fibers can be used. Aramid fibers are preferably used from the viewpoint of excellent resistance to radiation.

  As the aramid fiber, either a meta-aramid fiber or a para-aramid fiber can be used, but para-aramid fibers are preferred from the viewpoint of excellent tensile strength. Examples of such para-aramid fibers include polyparaphenylene terephthalamide fiber (manufactured by Toray DuPont, trade name “KEVLAR” (registered trademark)), copolyparaphenylene-3,4′-diphenyl ether terephthalamide fiber (Teijin Techno Products) Product name "Technora").

Basis weight of the fabric with organic fiber (base fabric) ^is preferably ^{50g / m 2 ~1,000g / m 2} . In the case of a fabric using an aramid fiber, even if the basis weight is 50 g / m ² , since the tensile strength of the fabric exceeds 1,000 N / inch, it becomes possible to produce a lightweight and strong composite membrane. Particularly preferred. In addition, when the basis weight is 1,000 g / m ² or less, a composite film having no problem in terms of light weight and bending fatigue resistance can be obtained. Basis weight of the fabric (base fabric) has a tensile strength, light weight, from the viewpoint of obtaining good composite membrane of the balance between flexural fatigue resistance, more preferably from ^{100g / m 2 ~800g / m 2} , more preferably it is a ^{200g / m 2 ~500g / m 2} .

  The fineness of the fibers constituting the base fabric is preferably thick from the viewpoint of strength, but if it is too thick, the processability to fabric is inferior. From an economical viewpoint, 220 dtex or more is preferable, More preferably, it is 220-6,400 dtex.

  The non-flammable or flame-retardant resin coating layer formed on both sides of the base fabric is obtained by completely covering both sides of the base fabric, and the mass of the resin coating layer is from 1 to 10 times the mass of the base fabric. A double mass is preferred. If the mass of the resin coating layer is equal to or more than the mass of the base fabric, the organic fibers constituting the base fabric can be prevented from being exposed from the resin coating layer, and the mass is 10 times the mass of the base fabric. If it is below, it is possible to prevent the entire composite membrane from becoming heavy and difficult to handle. The mass of the resin coating layer is more preferably 2 to 6 times the mass of the base fabric. When the non-flammable or flame-retardant resin coating layer is provided on both sides of the base fabric, the resin coating amount on both sides is not particularly limited, and may be appropriately determined according to the conditions to which the composite film is applied. The mass of the resin coating layer refers to the mass including the additive in the case of a resin coating layer using an incombustible or flame-retardant resin to which additives such as a plasticizer and a stabilizer described later are added. .

  Examples of non-flammable or flame retardant resins include vinyl chloride resin, vinylidene chloride resin, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinylidene chloride copolymer, vinyl chloride / acrylate copolymer, etc. A vinyl chloride resin is mentioned. Among these vinyl chloride resins, vinyl chloride resins are preferable from the viewpoint of processability and economy.

  One of these vinyl chloride resins may be used alone, or two or more thereof may be used in combination. When using 2 or more types together, the method of forming the resin coating layer formed on both surfaces of a base fabric with different resin, or forming the mixture of 2 or more types of resin on both surfaces of a base fabric, etc. are mentioned. By laminating these resins on both sides of the base fabric, the composite film can be made non-combustible. By using this non-combustible composite film, it can be used safely even in the event of a fire. it can.

  When forming a nonflammable or flame retardant resin coating layer on both sides of the base fabric, a conventionally known method can be used without any particular limitation. For example, it is possible to use a method in which a paste-like vinyl chloride composition sol softened by blending a plasticizer is coated on a base cloth and adhered, and then heated to gel. Alternatively, a method of heat laminating a soft vinyl chloride resin film previously formed into a film on a base fabric, or a method of dipping the base fabric in a vinyl chloride resin emulsion and then drying by heating may be used.

  The non-flammable or flame-retardant resin can provide effects such as extending the life of the resin by blending additives such as plasticizers, flameproofing agents, stabilizers, and UV absorbers. The compounding quantity of a plasticizer can be set arbitrarily and 30-100 mass parts is preferable with respect to 100 mass parts of polyvinyl chloride resin. In addition, known resin additives such as organic pigments, inorganic pigments, colorants, flame retardants, fillers, antistatic agents, antifungal agents, crosslinking agents, viscosity modifiers and the like can be arbitrarily blended.

  Known plasticizers, flameproofing agents, stabilizers, ultraviolet absorbers and the like can be used. Examples of the plasticizer include phthalic acid ester compounds, adipic acid ester compounds, and sebacic acid ester compounds. Examples of the flameproofing agent include inorganic compounds such as antimony oxide and zinc borate, and phosphoric acid ester compounds such as tris (dichloropropyl) phosphate. Examples of the stabilizer include Ba-Zn-based and Ca-Zn-based composite metal soaps, metal soaps such as barium stearate, organotin compounds such as dibutyltin laurate, and epoxy compounds such as epoxidized soybean oil. . Examples of the ultraviolet absorber include known triazole-based, benzophenone-based, and salicylic acid-based ultraviolet absorbers.

  In the composite film of the present invention, a fluorine resin coating layer is further formed on the surface of the non-flammable or flame retardant resin coating layer. Fluorine-based resins generally have excellent antifouling properties and are suitable for outdoor use. It also has excellent light resistance and can be used outdoors for a long time. Furthermore, the lifetime can be further extended by adding titanium oxide, an ultraviolet absorber, or the like to the fluororesin.

  Fluorine resins include vinyl fluoride resin, vinylidene fluoride resin, ethylene trifluoride chloride resin, ethylene tetrafluoride resin, ethylene tetrafluoride / perfluoroalkoxyethylene copolymer, ethylene tetrafluoride / ethylene copolymer A fluororesin selected from a polymer, a vinylidene fluoride / tetrafluoroethylene polymer, and the like can be used. Among these fluororesins, vinyl fluoride resins or ethylene / tetrafluoroethylene copolymers are particularly preferable because they are excellent in radiation resistance.

  In the composite film of the present invention, the fluororesin coating layer may be provided on at least one side of the non-flammable or flame retardant resin coating layer, and is not necessarily provided on both sides. When a building or the like is covered with a composite film provided with a fluorine-based resin coating layer only on one side, it is preferable to cover the building so that the side provided with the fluorine-based resin coating layer is on the outside.

  When forming a fluorine resin coating layer, a conventionally known method can be used without any particular limitation. For example, a method of applying a fluorine resin coating liquid to a non-flammable or flame retardant resin coating layer formed on a base fabric and drying, a method of applying a melt of a fluorine resin, or a film-like fluorine resin And a method of heat laminating. Examples of the application method include a roll coating method, a knife coating method, a spray coating method, and a dip coating method.

  The thickness of the coating layer is not particularly limited, and may be determined as appropriate according to the conditions to which the composite film is applied. As thickness of a coating layer, 10-80 micrometers is preferable and 10-50 micrometers is more preferable. When the thickness of the coating layer is 10 μm or more, antifouling property, weather resistance, and radiation resistance during curing can be imparted. On the other hand, when the thickness of the coating layer exceeds 80 μm, it is not preferable in terms of manufacturing cost.

  In order to enhance the adhesion between the fluorine-based resin and the non-flammable or flame-retardant resin when the fluorine-based resin coating layer is formed on the non-flammable or flame-retardant resin coating layer, for example, An intermediate layer made of acrylic resin, urethane resin or the like may be provided.

  EXAMPLES Next, although an Example and a comparative example are given and this invention is demonstrated further more concretely, this invention is not limited only to the following Examples. Each measured value in the examples was based on the following method.

(Weight)
Based on JIS K 6404-2-2: 1999 “Testing Method for Rubber and Plastic”, the mass of the composite film per 1 m ² was measured.

(Thickness)
The thickness of the composite film was measured based on JIS K 6404-2-3: 1999 “Testing Method for Rubber and Plastic”.

(Tensile strength of composite film)
Based on JIS K 6404-3: 1999 A-1 method (strip method), the tensile strength of the composite film in the vertical direction and the horizontal direction was measured and evaluated according to the following criteria.
○: More than 1,500 N / inch Δ; 1,000 N to 1,500 N / inch ×; less than 1,000 N / inch

(Evaluation of radiation resistance)
The irradiation was completed by irradiating γ rays (Co60) at room temperature (in the air) and completing the irradiation with a cumulative absorbed dose of 1 MGy.
The radiation resistance was evaluated according to the following criteria by comparing the tensile strength before and after the irradiation by performing the same tensile test after irradiating the sheet-like composite film with radiation.
○: Tensile strength after irradiation is 70% or more of the tensile strength before irradiation Δ: Tensile strength after irradiation is 50% to 70% of the tensile strength before irradiation
X: Tensile strength after irradiation is less than 50% of tensile strength before irradiation

(Evaluation of bending fatigue)
Based on JIS K 6404-3: 1999 A-1 method “Testing method of rubber and plastics”, a fir test was conducted to compare the bending fatigue properties. The sample after 1,000 times of firing was observed and evaluated according to the following criteria: ○: No abnormality.
Δ: Peeling of the resin layer is observed.
X: Peeling of the resin part and fraying of the fiber are observed.

(Evaluation of light resistance)
Based on JIS K 6404-17: 1999 “Testing Method for Rubber and Plastic”, a light resistance test was performed and the light resistance was compared. Samples after 450 hours exposure to an ultraviolet carbon arc lamp were observed and evaluated according to the following criteria using a faded gray scale.
○: Grade 3 or higher △; Grade 2 ×: Grade 1

Example 1
As an organic fiber fabric (base fabric), KEVLAR® fiber woven product number 710 (fiber: KEVLAR 29, fineness: 1,670 dtex, weaving density: 24 / inch × 24 / inch, basis weight: 319 g / m ² , thickness Thickness: 0.43 mm).
Paste vinyl chloride composition sol (paste vinyl chloride: 100 parts by weight, phthalate ester plasticizer: 60 parts by weight, Ba-Zn composite stabilizer: 2 parts by weight, epoxy soybean oil: 3 parts by weight on both sides of this base fabric , Ca-based filler: 10 parts by mass, cross-linking agent: 2 parts by mass, white pigment: 2 parts by mass), and this is heated at 170 ° C. to be gelled and coated with a double-sided resin. (Weight: 770 g / m ² , thickness: 0.55 mm) was obtained.

Next, a fluorine resin coating layer was formed. As the fluororesin, a TEDLAR (R) film manufactured by DuPont was used. The TEDLAR (R) film is a film made of vinyl fluoride resin, and the product number TWH15BE3 (thickness: 15 μm, basis weight: 56 g / m ² , specific gravity: 1.46) is previously applied on one side in order to improve adhesion. Was subjected to corona treatment.

A surface-treated TEDLAR (R) film was laminated on one side of the organic fiber fabric coated with the double-sided resin, and using a hot press machine, the temperature was 130 to 200 ° C., the press pressure was 20 kg / cm ² , and the press time was about A composite film was produced by hot pressing under conditions of 10 minutes.
The obtained composite film had a basis weight of 826 g / m ² , a thickness of 0.57 mm, and a tensile strength of 4,900 N / inch in the vertical direction and 5,300 N / inch in the horizontal direction.

(Example 2)
As an organic fiber fabric, KEVLAR (R) fiber woven product number 732 (fiber: KEVLAR 29, fineness: 440 dtex, weaving density: 32 / inch × 32 / inch, basis weight: 109 g / m ² , thickness: 0.15 mm) Was used. Both surfaces of this organic fiber fabric were coated with a resin under the same conditions as in Example 1 to obtain an organic fiber fabric coated with both surfaces of the resin. The basis weight was 560 g / m ² and the thickness was 0.39 mm. Next, in the same manner as in Example 1, a TEDLAR® film was heat pressed to produce a composite membrane.
The obtained composite membrane had a basis weight of 616 g / m ² , a thickness of 0.44 mm, and a tensile strength of 2,000 N / inch in the vertical direction and 2,000 N / inch in the horizontal direction.

Example 3
As an organic fiber fabric, KEVLAR (R) fiber woven product number 740 (fiber: KEVLAR 29, fineness: 440 dtex, weaving density: 40 / inch × 40 / inch, basis weight: 71 g / m ² , thickness: 0.13 mm) A composite membrane was produced in the same manner as in Example 1 except that was used.
The basis weight of the organic fiber fabric at the stage where the vinyl chloride composition was coated on both surfaces was 370 g / m ² and the thickness was 0.26 mm. Next, in the same manner as in Example 1, a TEDLAR® film was heat pressed to produce a composite membrane.
The obtained composite film had a basis weight of 426 g / m ² , a thickness of 0.28 mm, and a tensile strength of 1,400 N / inch in the vertical direction and 1,500 N / inch in the horizontal direction.

(Comparative Example 1)
As organic fiber fabric, the same as Example 1 except that polyester (PET) filament woven fabric (fineness: 1660 dtex, weaving density: vertical 21 pieces / inch, horizontal 19 pieces / inch, basis weight: 215 g / m ² ) is used. Thus, a composite membrane was produced.
The basis weight of the organic fiber fabric at the stage of coating the vinyl chloride composition on both sides is 670 g / m ² , the thickness is 0.5 mm, the basis weight of the composite film is 726 g / m ² , and the thickness is 0.52 mm, The tensile strength was 2,370 N / inch in the vertical direction and 2,120 N / inch in the horizontal direction.

(Comparative Example 2)
As the organic fiber fabric, a woven fabric using polyester (PET) filaments (fineness: 1660 dtex, weaving density: vertical 21 pieces / inch, horizontal 19 pieces / inch, basis weight: 215 g / m ² ) was used. Paste vinyl chloride composition sol (paste vinyl chloride: 100 parts by weight, phthalate ester plasticizer: 60 parts by weight, Ba-Zn composite stabilizer: 2 parts by weight, epoxy soybean oil: 3 parts by weight on both sides of this base fabric , Ca-based filler: 10 parts by mass, cross-linking agent: 2 parts by mass, white pigment: 2 parts by mass), and this is heated at 170 ° C. to be gelled and coated with a double-sided resin. Got. The weight of the composite film was 670 g / m ² , the thickness was 0.50 mm, and the tensile strength was 2,270 N / inch in the vertical direction and 2,020 N / inch in the horizontal direction.

(Comparative Example 3)
As the fiber fabric, a composite membrane was used in the same manner as in Example 1 except that a woven fabric using glass fiber (fineness: 960 dtex, weave density: vertical 19 pieces / inch, width 18 pieces / inch, basis weight: 203 g / m ² ) was used. Was made. Basis weight of the organic fiber fabric at the stage of coating the PVC composition on both sides 660 g / ^{m 2,} the thickness was 0.5 mm, basis weight of the composite film is 716 g / ^{m 2,} a thickness of 0.52 mm, The tensile strength was 853 N / inch in the vertical direction and 810 N / inch in the horizontal direction.

The composite films obtained in Examples 1 to 3 and Comparative Example 1 were evaluated for radiation resistance.
In addition to the above-described method for evaluating the radiation resistance based on the tensile strength values before and after irradiation, the appearance (crack, breakage, hardening, etc.) of the composite film after irradiation was also added to the evaluation. The evaluation results are shown in Table 1.

  From Table 1, it can be seen that the composite film of the present invention has high retention of tensile strength after irradiation and excellent radiation resistance compared to the composite film of Comparative Example 1 having substantially the same basis weight. I understand. The composite membranes of Examples 1 to 3 use aramid fibers (trade name: KEVLAR®) for the fabric, and by using such aramid fibers, a composite membrane excellent in radiation resistance can be obtained. I was able to confirm that.

  Although the present invention has been described above, it goes without saying that the present invention can be modified as appropriate within the scope of the claims.

  Since the composite film of the present invention has excellent radiation resistance and high tensile strength, it can be suitably used as a film material for curing under high radiation. It can also be used for outdoor lightweight tents.

1 Composite membrane 11 Organic fiber fabric (base fabric)
12 Nonflammable or flame retardant resin coating layer 20 Fluorine resin coating layer

(1) A high-strength fiber having a limiting oxygen index (LOI) of 25 or more and a tensile strength of 15 cN / dtex or more, and selected from an aramid fiber, a polyparaphenylenebenzbisoxazole fiber, and a wholly aromatic polyester fiber At least one organic fiber fabric is used as a base fabric, a non-flammable or flame-retardant resin coating layer is formed on both sides thereof, and a fluororesin coating layer is formed on at least one side of the resin coating layer A composite film for curing intended to prevent the scattering of radioactive materials .
(2) The composite membrane according to (1), wherein the organic fiber fabric is composed of at least one structure selected from a woven fabric, a knitted fabric, a knitted fabric, and a honeycomb-shaped product.
(3) Non-flammable or flame retardant resin coating layer is made of vinyl chloride resin, vinylidene chloride resin, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinylidene chloride copolymer, vinyl chloride / acrylic acid ester copolymer. The composite film according to (1) or (2), which is composed of at least one selected from the group consisting of:
(4) The composite film according to any one of (1) to (3) , wherein the high-strength fiber is an aramid fiber.
( 5 ) Fluorine-based resin coating layer is made of vinyl fluoride, vinylidene fluoride, ethylene trifluoride, tetrafluoroethylene, tetrafluoroethylene / perfluoroalkoxyethylene copolymer, ethylene tetrafluoride / ethylene copolymer The composite film according to any one of (1) to ( 4 ), comprising at least one resin selected from a coalescence and a vinylidene fluoride / tetrafluoroethylene copolymer.
( 6 ) The composite film according to any one of (1) to ( 5 ), wherein the tensile strength of the composite film is 1,000 N / inch or more in both the vertical and horizontal directions.

The high-strength fiber, A aramid fibers, polyparaphenylene benzobisoxazole fibers, wholly aromatic polyester fiber and the like, Ru using at least one selected from the group consisting of high-strength fibers. Of these, it is preferable to use an aramid fiber from the viewpoint of excellent resistance to radiation.

Claims (7)

  An organic fiber fabric having a limiting oxygen index (LOI) of 25 or more is used as a base fabric, a non-flammable or flame-retardant resin coating layer is formed on both sides thereof, and a fluororesin is formed on at least one surface of the resin coating layer A composite film having a coating layer formed thereon.   The composite film according to claim 1, wherein the organic fiber fabric is composed of at least one structure selected from a woven fabric, a knitted fabric, a knitted fabric, and a honeycomb-shaped fabric.   The non-flammable or flame retardant resin coating layer is selected from vinyl chloride resin, vinylidene chloride resin, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinylidene chloride copolymer, vinyl chloride / acrylate copolymer. The composite membrane according to claim 1 or 2, comprising at least one kind.   The organic fiber is a high-strength fiber, the tensile strength is 15 cN / dtex or more, and at least one fiber selected from an aramid fiber, a polyparaphenylene benzbisoxazole fiber, and a wholly aromatic polyester fiber is used. The composite film according to claim 1, comprising:   The composite membrane according to claim 4, wherein the high-strength fibers are aramid fibers.   The fluororesin coating layer is made of vinyl fluoride, vinylidene fluoride, ethylene trifluoride chloride, tetrafluoroethylene, tetrafluoroethylene / perfluoroalkoxyethylene copolymer, tetrafluoroethylene / ethylene copolymer, fluorine The composite film in any one of Claims 1-5 containing at least 1 or more types of resin chosen from the vinylidene fluoride and the tetrafluoroethylene copolymer.   The composite film according to any one of claims 1 to 6, wherein the tensile strength of the composite film is 1,000 N / inch or more in both the vertical and horizontal directions.

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