JPS61172736A - Flame-retardant sheet material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention provides a fiber sheet that is nonflammable or has excellent flame retardancy, has excellent stain resistance and weather resistance, and has excellent stitchability and bending resistance. It is related to.

BACKGROUND OF THE INVENTION In recent years, sheet materials containing various synthetic resins have been used as building materials, interior materials, vehicles, ships, aircraft, and other components. These synthetic resins have the disadvantage of generating a large amount of noxious or toxic gas or smoke when burned in a fire or the like. For example, a large amount of sheet materials containing polyvinyl chloride resin are used as the above-mentioned sheet materials, and various proposals have been made to make such sheet materials nonflammable or flame retardant.

For example, Japanese Patent Publication No. 55-4582 proposes adding a borate, a zinc compound, or an iron compound, and aluminum hydroxide or barium sulfate to the polyvinyl chloride resin to be applied to the base fabric of the sheet material. However, the results are still not completely satisfactory.

Japanese Patent Publications No. 53-13505, Japanese Patent Publication No. 51-37397, and Japanese Unexamined Patent Publication No. 54-68470 propose the use of silicone resin as the nonflammable resin. In these cases, the effect of making it nonflammable or flame retardant is quite high, but when sheet materials coated with such silicone resins are used outdoors, for example as sheets for tents, they can deteriorate significantly during use. Easy to get dirty (,
Moreover, since the surface of this silicone resin coating layer is soft and brittle, it has the drawback that various solid dust powders and the like cannot adhere to it, penetrate and become buried therein, or cause the coating layer to peel off.

Therefore, there has been a strong desire in the art to solve the above-mentioned drawbacks of non-flammable or flame-retardant coating layers.

Therefore, the present inventors have already prepared a non-combustible base fabric (glass fiber, asbestos fiber, metal fiber and/or other inorganic non-combustible fiber on at least one side thereof), which is selected from non-flammable or flame-retardant silicone resin and silicone rubber. Forming a coating layer containing at least one type of noncombustible coating layer, and covering at least one of the noncombustible coating layers with an antifouling/weather resistant coating layer formed from a thermoplastic synthetic resin material with excellent antifouling/weather resistance. proposed a flame retardant, durable or non-combustible sheet (Patent Application No. 100392/1982)
. This noncombustible sheet satisfactorily achieves the purpose of being noncombustible and flame retardant, and has excellent stain resistance and weather resistance, making it highly effective for tent curtains and other uses.

However, depending on the application, this noncombustible sheet is heavy (fabric weight) and inconvenient to use and handle, difficult to sew, and has low bending resistance, so it is easy to break during use and can be easily machined by sewing machine. There are problems such as easy tearing from the eyes.

Furthermore, it has been proposed in JP-A-59-204981 to simply coat an organic fiber base fabric with a silicone resin to impart flame retardancy and 1B water resistance to improve sewing properties and heat resistance. However, this does not solve the problem of stain resistance and weather resistance.

Conventionally, a coating layer containing silicone resin or silicone rubber is formed on a nonflammable inorganic fiber base fabric to make the sheet material nonflammable or flame retardant. To provide a flame-retardant fiber sheet that is easy to sew, has good bending resistance, and is difficult to cut at perforations by eliminating the drawbacks of the layer, that is, it is easily stained and the film is soft and easily peeled off. do.

To determine the intervening The above problems are solved by the sheet material of the present invention.

That is, the flame-retardant sheet material of the present invention includes a base fabric made of organic fiber fabric, and at least one surface of this base fabric is coated,
and a non-flammable coating layer formed from a coating material containing at least one kind selected from non-flammable or flame-retardant silicone resin and silicone rubber, and coating on at least one of the non-flammable coating layers, and It comprises an antifouling/weather resistant coating layer formed from a thermoplastic synthetic resin material with excellent stain and weather resistance.

of ! J Hl and the fibers constituting the base fabric used in the sheet material of the present invention are natural fibers such as cotton and linen, recycled fibers such as
viscose rayon, cufurana, etc., semi-synthetic fibers such as g- and tri-acetate fibers, and synthetic fibers such as nylon 6, nylon 66, polyester (polyethylene terephthalate, etc.) fibers, aromatic polyamide fibers, acrylic fibers, polychlorinated fibers It can be selected from vinyl fibers, polyolefin fibers, insolubilized or hardly soluble polyvinyl alcohol fibers, and the like. The fibers in the base fabric may be in any form such as short fiber spun yarn, long fiber yarn, split yarn, or tape yarn, and the base fabric may be a woven fabric, a knitted fabric, a nonwoven fabric, or a composite fabric thereof. It's okay. 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. In addition, the form of the fiber is
Long fibers (filaments) with little elongation under stress
It is preferable to have the shape of , and preferably to form a plain woven fabric. However, there are no particular limitations on the weaving structure or its form. The organic fiber base fabric is useful for maintaining the mechanical strength of the resulting flame-retardant sheet at a high level.

In the flame-retardant sheet of the present invention, it is preferable that the organic fibers constituting the base fabric have a melting point or thermal decomposition point of 300° C. or higher. Polymers that form such high melting point or high decomposition point fibers include those shown in Table 1.

Among the heat-resistant polymers shown in Table 1 below, polymekphenylene isophthalamide and polyparaphenylene terephthalamide are particularly common, and as para-aramid fibers other than those mentioned above, rHM-50J of Ondai ■ etc. can also be used.

Aromatic polyamides useful in such fibers also have at least 50 mole percent of formulas (4') and (II), ÷A
r lCON H± (1)÷Ar+−CO
NH-Ar! -NHCO± (II) [In the above formula, Ar,
and Ar represent a divalent aromatic group, which may be the same or different from each other. It is preferable that In the above formulas (1) and (II), the divalent aromatic groups represented by Ar and Ar2 are represented by the following formula, the following blanks [In the above formula, A is -o-, -s-, -5o-, -so□-
1-Co-, -CH2- or -C(CH3)z-] is preferably selected from aromatic residue moieties represented by the following. These aromatic residues may contain inert substituents such as halogen, alkyl groups, and nitro groups.

Generally, as aromatic polyamides, those having repeating units represented by the following formula as a main component are more preferable.

In addition to the above-mentioned heat-resistant organic 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.

Fibers with lower melting or decomposition points can also be mixed into the base fabric to promote adhesion and other performance with the heat-resistant coating layer. In this case, there are no particular limitations on the fibers to be mixed. However, it is preferable that the blending ratio of low melting point or low decomposition point fibers to be mixed is 70% or less,
More preferably, it is 50% or less.

The silicone resin and silicone rubber used to form the nonflammable or flame-retardant coating layer in the present invention include, for example, organopolysiloxane, poly(silorganylenesiloxane), polysilthian, polysilazane, and silicone-containing side chains. You can choose from carbon polymer, polysilane, etc.For example, flame retardant silicone resin KR166, KR168, KR202, KR made by Shin-Etsu Chemical.
2038 and KR-101-10 are examples that can be used in the present invention.

The silicone resin used in the present invention is selected from organopolysiloxane silicone resins, polyacryloxyalkylalkoxysilane silicone resins, polyvinylsilane silicone resins, and modified products of the silicone resins. It is preferable that

The organopolysiloxane resin used in the present invention is
Having at least one organic substituent such as a vinyl group, an allyl group, a hydroxyl group, an alkoxy group having 1 to 4 carbon atoms, an amino group, a mercapto group, polydimethylsiloxane silicone resin, polydiphenylsiloxane silicone resin, It includes polymethylphenylsiloxane silicone resins, resins made of copolymers thereof, and the like.

The polyacryloxyalkylalkoxysilane silicone resin used in the present invention has the general formula (R is a monovalent hydrocarbon group having 1 to 10 carbon atoms, and R' is hydrogen or a monovalent hydrocarbon group having 1 to 10 carbon atoms. (R# is a divalent hydrocarbon group having 2 to 10 carbon atoms, and n is an integer of 1 to 3.) and at least one ethylenically unsaturated monomer. This includes copolymers with

Furthermore, the polyvinylsilane silicone resin used in the present invention has the general formula % [where R' is the same as above, B is OR', or OR''-O
R'(R',R' are the same as above). ] Also included are copolymers of the vinyl silane compound represented by the formula and at least one ethylenically unsaturated monomer.

The above-mentioned ethylene thread picker contains 1 to 5 ethylene threads in the silicone resin.
It may be copolymerized with a content of 0% by weight. Such monomers include, for example, styrene, methylstyrene, dimethylstyrene, ethylstyrene, chlorostyrene, bromostyrene, fluorostyrene, nitrostyrene, or acrylic, methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate. , ethyl methacrylate, butyl methacrylate, acrylamide, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, acrylonitrile, methacrylonitrile, 2-
Examples include chloroacrylonitrile, vinyl acetate, vinyl chloroacetate, vinyl butyrate, vinyl chloride, vinyl bromide, vinyl fluoride, vinylidene chloride, vinyl halogen compounds, and vinyl ethers.

The silicone resins mentioned above may be combined with other resins, such as epoxies,
It may be modified with polyester, alkynd resin, amino resin, etc., or it may be modified with fatty acid.

In the present invention, one type or a mixture of two or more types selected from these organopolysiloxane silicone resins, polyacryloxyalkylalkoxysilane silicone resins, polyvinylsilane silicone resins, and modified products of these silicone resins is used. can. However, if self-extinguishing properties are important, organopolysiloxane silicone resins containing preferably 70% by weight or more of the polysiloxane component in the silicone resin, polyacrylooxyalkylalkoxysilane silicone resins, and polyvinyl In the silane silicone resin, it is preferable that the ethylenically unsaturated monomer to be copolymerized is 50% by weight or less, particularly 20% by weight or less. Furthermore, when flexibility is important as well as self-extinguishing property, unmodified organopolysiloxane silicone resin is preferred.

These silicone resins may be solid at room temperature, flexible pastes, liquids, or dispersions such as emulsions (if necessary, an appropriate solvent may be added before use). Based on the above, silicone resins are classified into room temperature curing type, heat curing type, ultraviolet ray or electron beam curing type, and they generally contain curing agents, curing accelerators, and curing accelerators well known to those skilled in the art.
For example, metal carboxylates of zinc, lead, cobalt, iron, etc.
dibutyltin octoate, dibutyltin laurate,
organic tin compounds such as, titanium chelate compounds such as tetrapropyl titanate, tetraoctyl titanate, N-
A desired three-dimensional structure can be obtained by using a combination of tertiary amines such as N-dimethylaniline and triethanolamine, peroxides such as benzoyl peroxide, dicumyl peroxide, and t-butyl peroxide, and platinum-based catalysts. Cures into a network structure.

The non-combustible or flame-retardant coating layer may be formed only from the silicone resin and/or silicone rubber as described above, but these materials contain 30 to 3
00%, preferably 100 to 250% of other fillers such as silica-based fillers, potassium titanate-based fillers, asbestos fibers, mica, and other inorganic heat-resistant materials may be mixed.

Fillers serve to reinforce the resin layer formed by the silicone resin face, and include various inorganic substances such as titanium oxide, mica, alumina, talc, glass fiber powder, rock wool fine fibers, silica powder, and clay. However, if you want the resulting sheet to have surface smoothness, it is generally 50 μm so as not to impair the surface smoothness of the sheet.
It is preferable to use a fine powder having a particle size of less than m.

Also, among the inorganic fillers, it is particularly effective to use alkali titanate to improve the heat resistance of the product. That is, the alkali titanate is used by being blended into the silicone resin face, and is used to ensure that the sheet of the present invention maintains sufficient flame retardant properties.

The alkali titanate will be explained in more detail.

Alkali titanate has the general formula M: 0·nTio.

・mH! 0 (wherein M represents an alkali metal such as Li, Ma, etc., n represents a positive real number of 8 or less, and m represents a positive real number of 0 or 1 or less). Yes, more specifically, Li, Tie, Li
, Ties (0<n<1.m=0), an alkali titanate with a salt-type structure, Naz Tit 016
1 KZ Tf, 2 Tis 01 to O1s'? (
n<8. This is an alkali titanate having a tunnel structure represented by m=o). Among these, the general formula Kg 0 ・
6 T i Ox mHz O (in the formula, m is the same as above)
Potassium hexatitanate and its hydrate represented by are suitable in that they greatly improve the fire resistance and heat insulation properties of the final target product.

Not only potassium hexatitanate but also alkali titanates are generally powders or fibrous microcrystals, but among these, those with a fiber density of 5 μm or more and an aspect ratio of 20 or more, particularly 100 or more, are suitable for use in the heat-resistant sheet of the present invention. Provides favorable results in improving strength. In addition, fibrous potassium titanate has a high specific heat and excellent heat insulation performance, and is particularly preferable for realizing the performance of the fire-resistant and heat-resistant sheet of the present invention.

The alkali titanate can be used as is, but in order to achieve better reinforcing hardening, it is necessary to use an alkali titanate of 0.05 to 1
．． It is best to use fibers whose surfaces have been treated with about 0.1% of a silane coupling agent, such as a gin coupling agent such as T-aminopropyltriethoxysilane or T-glycidoxypropyrotrimethoxysilane. preferable.

Furthermore, the coating layer of the present invention may contain a high refractive index inorganic compound or a heat-absorbing inorganic compound.

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. let 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 sheet base material.

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, and examples thereof include the following: .

1) Dolomite (dolomite, specific gravity 2.8-2.9, refractive index 1.50-1
．． 68) Magnesite (Rhiochite 〃3.O～3.1 〃1.51～1.
72) Finish rough "°Suit(,"2.9~=3.0 - 1.63~1.68
) Apatite (scalyte 〃3.1~3.2 〃1.63~1
．． 64) Spinel (Spinel 〃3.5~3.6 〃1.72000
．． 73) Corundum (3.9~4.0 1.76~1.77) Zircon (3.90~4.10 1.79~1.81)
Silicon carbide (〃3.17~3.19 〃1.65~2.68)
Powder of crushed natural or synthetic minerals such as

2) Fine powders or granules of frit or high refractive glass or dissolved phosphorous fertilizer obtained as a solid solution of phosphorite and snake ore, and other similar solid solutions, and fibrous materials such as foams.

In addition, endothermic inorganic compounds include calcined gypsum, alum, calcium carbonate, aluminum hydroxide, hydrosalcite-based aluminum silicate, etc., crystal water releasing type, carbon dioxide gas releasing type, decomposition endothermic type, phase change type, etc. Examples include type inorganic compounds.

By mixing and dispersing a fibrous alkali titanate and, if necessary, a high refractive index inorganic compound and/or an endothermic inorganic compound in a silicone resin, a coating mixture for sheet production according to the invention is obtained. All known means can be used to adjust the mixing and dispersion. In addition, the above coating mixture contains dispersants and defoamers to homogeneously disperse each component, colorants to adjust color and mechanical strength, resin powder, flame retardants, metal powder, etc. Various fillers can be freely mixed. Incidentally, it is preferable to mix metal powder such as copper powder, nickel powder, brass powder, aluminum powder, etc. from the viewpoint of improving surface heat, reflection effect, and penetration suppressing effect.

The surface of the base fabric can be coated with the above-mentioned coating layer by coating the coating mixture on the surface of the base fabric by spraying, brushing, roll coating, etc., or by molding the dipping mixture into a film. There is a method of adhering the base fabric to the surface of the base fabric, or a method of immersing the base fabric in a coating mixture to impregnate it.

The heat-resistant sheet of the present invention is manufactured, for example, as follows. That is, after adding an appropriate curing accelerator and additives to a mixture of a silicone resin, an alkali titanate, and, if necessary, a high refractive index inorganic compound and/or an endothermic inorganic compound, toluene, xylene, trichlene, etc. are added as necessary. An organic solvent is added to make a dispersion of an appropriate concentration, and this dispersion is coated by conventionally well-known coating methods such as the M method, spray method, roll coating method, reverse roll coating method, knife coating method, etc. Apply to one or both sides of the base fabric and apply at room temperature or under heating, preferably within the range of 150 to 200°C.
The silicone resin is cured by heat treatment for a minute and is integrally fixed to the above-mentioned base material. The blending ratio of silicone resin and alkali titanate, high refractive index inorganic compound, and/or endothermic inorganic compound, etc. varies depending on the type and particle size of the silicone resin and inorganic compound used, but in general, if there is too little silicone resin, the coating layer As a result of insufficient strength, when used as a fire-resistant heat insulating sheet, defects such as cracking in the coating layer or peeling of the coating layer from the base fabric occur, and conversely, if there is too much silicone resin, the heat resistance deteriorates. In severe cases, flammable combustion may occur.

Therefore, in the present invention, the amount of alkali titanate blended with 100 parts by weight of silicone resin (hereinafter "parts by weight" is abbreviated as "parts") is 1 to 200 parts, preferably 30 to 100 parts, and furthermore, When blending a refractive index inorganic compound and/or an endothermic inorganic compound, etc., it can be blended up to 400 parts by replacing it with alkali titanate corresponding to the same weight to 1/4 of the weight, but usually 10 to 10 parts by weight. 300
A range of 50% is preferred. Furthermore, these high refractive index inorganic compounds,
Part or all of the endothermic inorganic compound can be replaced with commonly used inorganic pigments, inorganic extender fillers, inorganic powders that impart flame retardancy, etc., but the amount used is 100 parts of silicone resin. It is preferably 400 parts or less, more preferably 300 parts or less. A flame retardant may be used in combination to 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. There are endothermic decomposition type inorganic compounds made of inorganic compounds such as crystal water release type, carbon dioxide gas release type, decomposition endothermic type and phase change type such as aluminum and hydrotalcite aluminum silicate, and inorganic flame retardants such as antimony compounds. .

The thickness of the heat-resistant sheet of the present invention is preferably 0.02 mm or more, and 0.05 to 2.0 mm. More preferably, it is within the range of Ota. Moreover, the thickness of the coating layer is 5 to 20
It is preferably 0 μm, more preferably 10 to 1500 μm.

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 non-flammable or flame-retardant coating phase, but it is generally 10 to 1000 g/cd.

It is preferably formed with a weight of 50-700 g/rrr and a thickness of 10-500 microns on one side.

As the antifouling and weather-resistant synthetic resin used in the present invention, fluorine-containing resins and acrylic resins can be used.

That is, the antifouling/weather-resistant coating layer is generally formed by adhering a film made of a fluorine-containing resin or an acrylic resin onto a desired nonflammable coating layer.

Although fluorine-containing resins are generally nonflammable, they are not compatible with ordinary plastic adhesives, so it is extremely difficult to adhere them to the surface of a silicone resin or rubber layer as is.

In the present invention, by subjecting the fluorine-containing resin film to surface corona discharge treatment and activating it as much as possible, it is possible to improve the affinity with resin adhesives such as vinyl chloride, epoxy, acrylic, polyester, etc., or the above-mentioned adhesives. is increasing. Usually, the above treatment activates the surface portion of the fluorine-containing resin film.

For this purpose, for example, 100-200cm, 40-100cm.
17F.

Discharge treatment is performed under conditions of a short circuit current of 1 to 2 A.

Such discharge treatment gives the fluorine-containing resin film the desired adhesion ability, but the surface treatment of the fluorine-containing resin film used in the present invention is not limited to this, and other surface treatments etc. can give the same or better adhesive ability. It is fine as long as it is effective.

The resin constituting the fluorine-containing resin film includes various polyfluoroethylenes synthesized from monomers in which one or more hydrogen atoms of ethylene are replaced with fluorine atoms, such as polytetrafluoroethylene, or partially chlorine. There are various types of polyfluorochloroethylene, such as polytrifluorochloroethylene, including polyvinyl fluoride, polyvinylidene fluoride, polydichlorodifluoroethylene,
Others are also included. The thickness of the film is generally 0.001
The thickness is about 0.5 to 0.5 microns, preferably about 5 to 50 microns, but it can be made thicker or thinner if it achieves the objectives of weather resistance, antifouling properties, and durability, but there are no particular limitations. There isn't. Furthermore, the fluorine-containing resin film may be mixed with other resins such as MMA, etc., as long as the object of the present invention is achieved. Commercially available fluorine-containing resin films used in the present invention include Tetra Film (Dupont Trademark), Afresox Film (Asahi Glass Commercial! 1), KFC Film (Kureha Chemical), and the like.

In the present invention, it is preferable that a fluorine-containing resin in the form of a film with a substantially smooth surface is adhered to the upper surface of the silicone resin or rubber coating layer, but a method of applying a fluorine-containing resin solution, emulsion, etc. is also possible. be. The fluorine-containing resin film used in the present invention preferably has a tensile strength of 100 kg/co1 or more.

In the present invention, the antifouling/weatherproof coating layer may be formed of acrylic resin. For this purpose, an acrylic resin film is generally used, but a method of applying an acrylic resin solution or emulsion onto a silicone resin or rubber coating layer and drying may also be used.

The acrylic resin film used in the present invention is 100k
It is preferable to have a tensile strength of g/c4 or more, and 1 to
Weight of 50g/rrf, preferably 3-30g/rrf, or 5 microns or more (usually 10-50 microns)
The thickness is more preferably 30 to 15 microns.

The adhesive resin film applied to the present invention may be based on the T-die method, the inflation silane method, or any other method.Also, it may be stretched or unstretched, but the elongation is about 100 to 300%. Further, as mentioned above, the thickness is usually about 5 μm to 50 μm, but it may be slightly thicker or thinner if sufficient weather resistance and antifouling properties are achieved.

The film material is a polyalkyl methacrylate film, such as a film whose main material is methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, etc., or acrylate, vinyl acetate,
A film formed from a homopolymer or copolymer containing vinyl chloride, styrene, acrylonitrile, methacrylate trile, etc. as a homomonomer or comonomer component is preferable. Such a film is adhered to the surface of the silicone resin or rubber coating layer using an adhesive or by other methods.

In the present invention, the antifouling/weatherproof coating layer formed on the silicone resin or rubber coating layer is composed of a polyvinylidene fluoride resin layer and an acrylic resin layer, in addition to the above-mentioned fluorine-containing resin and acrylic resin. It may consist of a laminate or a laminate of a polyvinylidene fluoride resin layer, an acrylic resin layer, and a polyvinyl chloride resin layer. In these laminates, the thickness of the polyvinylidene fluoride resin layer is 2 to 2.
3 microns, the thickness of the acrylic resin layer is preferably 2 to 4 microns, and the thickness of the polyvinyl chloride resin layer is preferably 40 to 45 microns, but the thickness is not limited to these values.

In the flame-retardant sheet of the present invention, the non-flammable 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, depending on the usage situation. Double-sided formation may be an essential condition. In addition, depending on the performance required for the sheet, the other side may be made of natural rubber or
Neoprene rubber, chloroprene rubber, silicone rubber,
Hypalon and other synthetic rubbers, PvC resins, ethylene-vinyl acetate copolymer (EVA) resins, acrylic resins, silicone resins, urethane resins, polyester resins and other synthetic resins can also be used. In this case, it is more preferable that these resins are flame retardant.

The thickness of the coating layer is 5 to 2000 μm, especially 10 to 1500 μm.
Preferably it is μm.

The flame retardant sheet of the present invention may be formed into a tape shape or a strip shape, or a wide sheet may be cut into a tape shape or a strip shape. Further, the flame retardant sheet of the present invention may be used in combination with other materials such as foam or net.

The flame-retardant sheet of the present invention may be coated or wrapped around a material to be protected, such as an electric wire.

Blood loss base The flame retardant sheet of the present invention will be further explained with reference to Examples.

Example 1.2 and comparative example In Example 1, the following fabric was used as the base fabric.

Fabric A--Aromatic polyamide long fiber yarn (Kevlar, trademark,
DuPont) 195d/130fX 195d/130
f eye 4th dimension: 60g/rrl tensile strength (
Longitudinal and latitudinal average): 149kg/3cm Example 2
In this case, the following fabric was used as the base fabric.

Fabric B - Aromatic solamide spun yarn Conex, trademark, Ontaisha) Eye size: 90 g/rrr Tensile strength (average in warp and weft directions): 66 kg/3 cm In Comparative Example 1, the following fabric was used as the base fabric .

Fabric C - Glass fiber cloth grain 4 dimensions: 290g/nf Above fabric A,
A coating dispersion having the following composition was applied to both sides of each of B and C.

Curing agent: 2 parts by weight Potassium titanate (Teismo D, trademark, Otsuka Chemical Co., Ltd.) The applied dispersion layer was air-dried for 5 minutes, then heated at 200°C for 5 minutes.
A heat treatment was performed for a minute to form a coating layer each having a thickness of 0.1 m.

30 g of alkaline adhesive (SC-462, manufactured by Sony Chemical Co., Ltd.) was applied to the silicone resin-coated surface of each sheet obtained.
g/rrr, and coated with an RFC sheet manufactured by Kureha Chemical Industry Co., Ltd. [vinylidene fluoride resin (2
~3 μm)/acrylic resin (2-4 μm)/PVC resin (45 μm)) were thermally attached with the PVC side facing the adhesive sublayer side.

The flame retardant and antifouling properties of the obtained flame-retardant sheets were both extremely good, but the folding durability and sewing properties were as shown in the table below.

Margin below Table 2 (Rate) l JIS-P8115 (1776) (*)
2 The joint was torn during the manufacturing process.

(Umbrella), Almost Infinite Compliant with "Test method for folding strength using MIT type tester for paperboard and paperboard" (Umbrella) 4 Singer 122W-115 industrial sewing machine (2
500 d of thread made of Nomex multifilament thread using a regular needle, lock stitch thread feeder, and for tents.
/2f, sew by lockstitch, two straight stitches, with the number of stitches listed in Table 2, observe the sewn joint, and
Its tensile strength was measured.

As Table 2 clearly shows, the conventional noncombustible sheet of Comparative Example 1 has low folding 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 flame-retardant sheets of the present invention (Examples 1 and 2) exhibited good flame retardancy, antifouling/weather resistance, folding strength, stitchability, and tensile strength at sewn joints.

Example 3 A fabric woven by alternating the following polyester multifilament yarns and aromatic polyamide yarns both vertically and horizontally was used as a base fabric.

Weight: 300g/rd thickness
Size: 0.35 m Acrylic resin adhesive (trademark, 5C-462, Sony Chemical Co., Ltd.) was applied to both sides of this base fabric at a coating amount of 30 g/rd, and a flame retardant adhesive similar to that in Example 1 was applied. A coating layer was formed.

- An acrylic resin film (25 μm) manufactured by Mitsubishi Rayon Co., Ltd. was heat-affixed to one side of the obtained flame-retardant sheet via an adhesive layer similar to Example 1 to obtain a flame-retardant sheet.

The flame retardancy and stain resistance of this sheet are extremely good, and the folding strength, sewing properties, and tensile strength of the seamed joints are also excellent in Example 1.
The results were good.

The flame-retardant sheet of the present invention has sufficient non-flammability or flame-retardant properties, and is less prone to dirt during use, and prevents dirt particles from penetrating into the coating layer or burying the coating layer. It does not peel off, is lightweight and strong, and has excellent resistance to bending and bending, and is easy to sew. Therefore, the flame-retardant sheet of the present invention is suitable for fire-resistant layers, opening/closing partition curtains, and other uses that are subject to intense bending, vibration, flapping, etc. at high temperatures and are easily soiled. Therefore, it has a wide range of uses as a flame-retardant sheet material.

The flame-retardant sheet of the present invention does not emit smoke or generate heat even at high temperatures, and is a building material for gymnasiums, warehouses, markets, playgrounds, factories, parking lots, various accommodation facilities, etc. where fire is expected. It is also used as an interior material, and also as a material for tents, awnings, blinds, sheets, partitions, etc.

Margin below Procedural amendment (voluntary) March/Sunday, 1985

Claims (1)

[Scope of Claims] 1. A fibrous base fabric made of organic fibers, and at least one material selected from nonflammable or flame-retardant silicone resins and silicone rubbers, covering at least one surface of the fibrous base fabrics. 1
A non-flammable coating layer formed from a coating material containing seeds, and a barrier coating formed from a thermoplastic synthetic resin material having excellent dirt resistance and weather resistance and covering at least one of the non-flammable coating layers. A flame-retardant sheet material comprising a dirt and weather-resistant coating layer. 2. The flame-retardant sheet according to claim 1, wherein the organic fiber has a melting point or thermal decomposition point of 300° C. or higher. 3. The nonflammable coating layer is made of at least one selected from the nonflammable or flame retardant silicone resin and silicone rubber.
A sheet material according to claim 1, consisting only of seeds. 4. The nonflammable coating layer is made of at least one selected from the nonflammable or flame retardant silicone resin and silicone rubber.
2. A sheet material according to claim 1, which is formed from a mixture of seeds and 30 to 300% by weight of non-combustible or flame-retardant fillers. 5. The sheet material according to claim 1, wherein the antifouling/weather-resistant synthetic resin is made of at least one selected from fluorine-containing resins and acrylic resins. 6. The sheet material according to claim 1, wherein the antifouling/weather-resistant coating layer is formed of a laminate consisting of a polyvinylidene fluoride resin layer and an acrylic resin layer. 7. The sheet according to claim 1, wherein the antifouling/weather-resistant coating layer is formed of a laminate of a polyvinylidene fluoride resin layer, an acrylic resin layer, and a polyvinyl chloride resin layer. material.