WO2022149331A1

WO2022149331A1 - Frame-retardant fabric containing infrared absorbent and textile product of same

Info

Publication number: WO2022149331A1
Application number: PCT/JP2021/038775
Authority: WO
Inventors: 内堀恵太; 大野重樹
Original assignee: 株式会社カネカ
Priority date: 2021-01-05
Filing date: 2021-10-20
Publication date: 2022-07-14
Also published as: JP2024021087A

Abstract

One or more embodiments of the present invention relate to a flame-retardant fabric which has a limiting oxygen index of 26 or more, while containing from 1.0% by weight to 20% by weight of an infrared absorbent relative to the total weight of the flame-retardant fabric, wherein: the near-infrared light transmittance is less than 11%; the infrared absorbent is contained in the fibers that constitute the flame-retardant fabric; and the infrared absorbent does not contain carbon black. Consequently, the present invention provides: a flame-retardant fabric which has excellent thermal barrier properties, flame retardancy and color developability; and a textile product which uses this flame-resistant fabric.

Description

Flame-retardant fabrics containing infrared absorbers and their textile products

The present invention relates to a flame-retardant fabric containing an infrared absorber and a textile product thereof.

In recent years, since the outside temperature due to sunlight is high (especially in midsummer), various fabrics have been developed for the purpose of suppressing the temperature rise as fabrics used for sunshades and curtains in order to reduce the influence on the human body. ing. For example, Patent Document 1 proposes a heat-shielding fiber fabric in which a resin layer having a conductive metal oxide is applied to the surface of the fabric. In Patent Document 1, by using a conductive metal oxide as an infrared absorber, the transmission of infrared rays is blocked and the temperature of the cloth itself rises, but the temperature rise on the back surface side of the cloth having a resin layer is suppressed. It is possible to block heat rays from the sun during the daytime in the summer.

Japanese Unexamined Patent Publication No. 2002-370319

However, although the heat ray-blocking fiber fabric described in Patent Document 1 can obtain heat-shielding property, its flame retardancy has not been investigated, and consideration is given to the fact that it is used at a distance close to the human body such as an indoor interior or a tent. Then, there remained a problem from the viewpoint of safety. Further, since the resin layer containing the metal oxide is laminated on the cloth, the washing durability and the texture may be deteriorated. On the other hand, carbon black is well known as an infrared absorber, but when carbon black is kneaded into the fiber, the whiteness of the fiber is lowered and the color development property when the fabric containing the fiber is dyed is inferior. There was a problem.

In order to solve the above problems, the present invention provides a flame-retardant fabric having excellent heat-shielding, flame-retardant and color-developing properties, and a textile product using the same.

The present invention is a flame-retardant fabric in one or more embodiments, has a limiting oxygen index of 26 or more, and has an infrared absorber of 1.0% by weight or more and 20% by weight based on the total weight of the flame-retardant fabric. It is said that the infrared absorber has a transmittance of less than 11%, the infrared absorber is contained inside the fiber constituting the flame-retardant fabric, and the infrared absorber does not contain carbon black. It relates to a characteristic flame-retardant fabric.

The present invention relates to a textile product containing the flame-retardant fabric in one or more embodiments.

According to the present invention, it is possible to provide a flame-retardant fabric having excellent heat-shielding property, flame-retardant property and color-developing property, and a textile product using the same.

As a result of diligent studies, the present inventors have made the fabric contain an infrared absorber in a specific amount excluding carbon black and set the transmittance of near-infrared rays to less than 11%, thereby improving the heat-shielding property of the fabric. I found that. The reason is not speculative, but the infrared absorber contained in the fabric absorbs near-infrared rays and converts them into heat, so that the temperature is lowered at a position away from the back surface of the surface in the infrared incident direction. It is thought that it can be kept. Further, since the infrared absorber is contained inside the fibers constituting the fabric, the texture is better and the washing durability is higher than that in the case where the infrared absorber is adhered to the fiber surface. Further, since the cloth does not use a dark infrared ray absorber such as carbon black, the whiteness of the cloth does not decrease and the color development property at the time of dyeing becomes good. Further, since the fabric has a critical oxygen concentration of 26 or more and is highly flame-retardant, it is possible to expand the range in which it can be developed as a textile product from the viewpoint of safety.

<Transmittance>
The transmittance means the spectral transmittance (%) of the cloth having a wavelength of 250 to 2500 nm by a spectrophotometer, and the near-infrared transmittance means the average value of the transmittances having a wavelength of 780 to 2500 nm. The lower the transmittance of near-infrared rays, the higher the heat-shielding rate, and the higher the transmittance, the lower the heat-shielding rate. In one or more embodiments of the present invention, the flame-retardant fabric has a transmittance of less than 11% for near-infrared rays, and when it is 11% or more, it is not preferable from the viewpoint of heat shielding properties, and the near-infrared rays of the fabric irradiate the fabric. It may be difficult to sufficiently suppress the temperature rise on the back surface side of the surface. In one or more embodiments of the present invention, the numerical range indicated by "... to ..." includes both ends values as in the numerical range indicated by "... or more ... or less".

In one or more embodiments of the present invention, the lower limit of the transmittance of near-infrared rays of the flame-retardant fabric is not particularly limited, but may be 4% or more from the viewpoint of easily improving the heat-shielding property, for example. In one or more embodiments of the present invention, the transmittance of near-infrared rays of the flame-retardant fabric is preferably 4% or more and less than 11%, and more preferably 4.2% or more and 10.9% or less. , 4.5% or more and 10.5% or less, more preferably 5% or more and 10% or less, and even more preferably 5.2% or more and 9% or less. It is particularly preferable that it is 5% or more and 8% or less.

<Heat shield rate>
The heat shield rate is such that the distance between the light source and the cloth is 50 cm, the front surface of the cloth is irradiated with the light source, and the black body at a position 10 cm away from the back surface of the cloth is the black body with and without the cloth. The temperature of is measured and calculated by the following formula (1).

[Formula 1]
Heat shield rate (%) = (AB) / A × 100
A: Blackbody temperature (° C) when there is no cloth, B: Blackbody temperature (° C) when there is cloth

In one or more embodiments of the present invention, the heat shield rate of the flame-retardant fabric is preferably 45.0% or more. When the heat shield rate is less than 45.0%, the heat shield becomes insufficient and the temperature of the fabric increases due to the heat, and the temperature rise becomes large even at a position away from the fabric, which is not preferable.

In one or more embodiments of the present invention, the upper limit of the heat shield rate of the flame-retardant fabric is not particularly limited, but may be 55% or less, for example, from the viewpoint of easily suppressing the permeability. In one or more embodiments of the present invention, the heat shielding rate of the flame-retardant fabric is preferably 45.0% or more and 55% or less.

<Infrared absorber>
The infrared absorber is contained in an amount of 1.0% by weight or more and 20% by weight or less based on the total weight of the fabric. As a result, it is possible to obtain a fabric having high infrared absorption ability, low average transmittance, and heat shielding performance. From the viewpoint of improving the infrared absorbing ability, it is more preferable to contain the infrared absorber in the fabric in an amount of 1.5% by weight or more and 19% by weight or less. From the viewpoint of dyeability, the infrared absorber preferably contains 1.8% by weight or more and 18% by weight or less, more preferably 2.0% by weight or more and 17% by weight or less, and further preferably 3.0% by weight or more and 16% by weight. Including% or less. Since the infrared absorber is contained inside the fibers constituting the fabric, preferably uniformly dispersed inside the fibers, the texture is compared with the case where the infrared absorber is adhered to the fiber surface. Is good, and the washing durability is also high.

The infrared absorber may be any as long as it has an effect of absorbing near infrared rays except carbon black, and is not particularly limited. For example, it is preferable to have an absorption peak in the wavelength region of 750 to 2500 nm. Specific examples thereof include metal oxides, and more specifically, antimony-doped tin oxide, indium tin oxide, niob-doped tin oxide, phosphorus-doped tin oxide, fluorine-doped tin oxide, and antimony-doped supported on a titanium oxide substrate. Examples thereof include tin oxide, iron-doped titanium oxide, carbon-doped titanium oxide, fluorine-doped titanium oxide, nitrogen-doped titanium oxide, aluminum-doped zinc oxide, and antimony-doped zinc oxide. Indium tin oxide includes indium-doped tin oxide and tin-doped indium oxide. From the viewpoint of improving the infrared absorptive capacity, the infrared absorber is preferably a tin oxide-based compound, and antimony-doped tin oxide, indium tin oxide, niobium-doped tin oxide, phosphorus-doped tin oxide, fluorine-doped tin oxide, and titanium oxide. It is more preferably one or more selected from the group consisting of antimony-doped tin oxide carried on the substrate, and one or more selected from the group consisting of antimony-doped tin oxide and antimony-doped tin oxide supported on the titanium oxide substrate. It is even more preferable, and it is even more preferable that the antimony-doped tin oxide is carried on the titanium oxide substrate. The infrared absorber may be used alone or in combination of two or more.

In one or more embodiments of the present invention, the infrared absorber does not contain carbon black. By not containing carbon black, the whiteness does not decrease, the fabric can be light-colored, and the color-developing property at the time of dyeing becomes good.

The infrared absorber preferably has an average particle size of 2 μm or less, more preferably 1 μm or less, and even more preferably 0.5 μm or less, from the viewpoint of being easily dispersed evenly inside the fiber. In one or more embodiments of the present invention, the particle size of the infrared absorber can be measured by a laser diffraction method in the case of powder, and in the case of a dispersion (dispersion liquid) dispersed in water or an organic solvent. Can be measured by laser diffraction or dynamic light scattering.

<Fiber>
In one or more embodiments of the present invention, the fibers constituting the flame-retardant fabric are not particularly limited, but for example, from the viewpoint of dispersibility of the infrared absorber in the fibers, at least acrylic fibers, cellulose fibers, and the like. And preferably contains any of polyester fibers.

<Acrylic fiber>
The acrylic fiber is preferably composed of an acrylic polymer containing 40 to 70% by weight of acrylonitrile and 30 to 60% by weight of other components with respect to the total weight of the acrylic polymer. When the content of acrylonitrile in the acrylic polymer is 40 to 70% by weight, the heat resistance and flame retardancy of the acrylic fiber are improved.

The other components are not particularly limited as long as they can be copolymerized with acrylonitrile. For example, a halogen-containing vinyl-based monomer, a sulfonic acid group-containing monomer, and the like can be mentioned.

Examples of the halogen-containing vinyl-based monomer include halogen-containing vinyl and halogen-containing vinylidene. Examples of the halogen-containing vinyl include vinyl chloride and vinyl bromide, and examples of the halogen-containing vinylidene include vinylidene chloride and vinylidene bromide. These halogen-containing vinyl-based monomers may be used alone or in combination of two or more. From the viewpoint of heat resistance and flame retardancy, the acrylic fiber preferably contains 30 to 60% by weight of a halogen-containing vinyl monomer as another component with respect to the total weight of the acrylic polymer.

Examples of the monomer containing a sulfonic acid group include methacrylsulfonic acid, allylsulfonic acid, styrenesulfonic acid, 2-acrylamide-2-methylpropanesulfonic acid, and salts thereof. In the above, examples of the salt include, but are not limited to, sodium salts such as sodium p-styrene sulfonic acid, potassium salts, and ammonium salts. These monomers containing a ruphonic acid group may be used alone or in combination of two or more. A monomer containing a sulfonic acid group is used as needed, but if the content of the monomer containing a sulfonic acid group in the acrylic polymer is 3% by weight or less, it is produced in the spinning process. Excellent stability.

The acrylic polymer is a copolymer of 40 to 70% by weight of acrylonitrile, 30 to 57% by weight of a halogen-containing vinyl-based monomer, and 0 to 3% by weight of a monomer containing a sulfonic acid group. It is preferably a polymer. More preferably, the acrylic polymer contains 45 to 65% by weight of acrylonitrile, 35 to 52% by weight of a halogen-containing vinyl-based monomer, and 0 to 3% by weight of a sulfonic acid group. It is a copolymerized copolymer.

The acrylic fiber is not particularly limited, but preferably contains the above-mentioned infrared absorber inside the fiber, and more preferably is uniformly dispersed inside the fiber. The infrared absorber is easily dispersed in the fiber, and the fabric is easily heat-shielded.

The acrylic fiber is not particularly limited, but preferably contains a flame retardant from the viewpoint of flame retardancy. Examples of the flame retardant include antimony compounds. The content of the antimony compound in the acrylic fiber is preferably 2 to 30% by weight, more preferably 3 to 20% by weight, based on the total weight of the fiber. When the content of the antimony compound in the acrylic fiber is within the above range, the production stability of the spinning process is excellent and the flame retardancy is good.

Examples of the antimony compound include antimony acid salts such as antimony trioxide, antimony tetroxide, antimony pentoxide, antimony acid, and sodium antimonate, antimony oxychloride, and the like, and one or a combination of two or more thereof. Can be used. From the viewpoint of production stability in the spinning process, the antimony compound is preferably one or more compounds selected from the group consisting of antimony trioxide, antimony tetroxide and antimony tetroxide.

The acrylic fiber is not particularly limited, but may contain an ultraviolet absorber. The ultraviolet absorber is not particularly limited, and for example, an inorganic compound such as titanium oxide or zinc oxide, an organic compound such as a triazine-based compound, a benzophenone-based compound, or a benzotriazole-based compound can be used. Above all, titanium oxide is preferable from the viewpoint of whiteness. The acrylic fiber preferably contains an ultraviolet absorber in an amount of 0.3 to 10% by weight, more preferably 0.5 to 7% by weight, still more preferably 1 to 5% by weight, based on the total weight of the acrylic fiber. include.

Further, the acrylic fiber is, if necessary, a flame retardant aid, a matting agent, a crystal nucleating agent, a dispersant, a lubricant, a stabilizer, a fluorescent agent, and an antioxidant, as long as the effect of the present invention is not impaired. , Antistatic agents, pigments and other various additives may be contained.

The fineness of the acrylic fiber is not particularly limited, but is preferably 1 to 20 dtex, more preferably 1.5 to 15 dtex, from the viewpoint of spinnability, processability, texture and strength when made into a fabric. The fiber length of the acrylic fiber is not particularly limited, but is preferably 38 to 127 mm, more preferably 38 to 76 mm, from the viewpoint of spinnability and processability. In one or more embodiments of the present invention, the fineness of the fiber is measured based on JIS L 1015.

The strength of the acrylic fiber is not particularly limited, but is preferably 1.0 to 4.0 cN / dtex, and more preferably 1.5 to 3.0 cN / dtex from the viewpoint of spinnability and processability. preferable. The elongation of the acrylic fiber is not particularly limited, but is preferably 20 to 35%, more preferably 20 to 25%, from the viewpoint of spinnability and processability. In one or more embodiments of the present invention, the strength and elongation of the fiber are measured based on JIS L 1015.

It can be manufactured by wet spinning the undiluted spinning solution in the same manner as for general acrylic fibers, except that an infrared absorber, a flame retardant, etc. are added to the undiluted spinning solution in which the acrylic polymer is dissolved.

As the acrylic fiber, an acrylic fiber containing an infrared absorber inside the fiber and an acrylic fiber containing no infrared absorber inside the fiber may be used in combination.

<Cellulose fiber>
Cellulose-based fibers are a general term for fibers derived from cellulose, and are not particularly limited, and commercially available cellulosic fibers may be used. For example, cotton, hemp (including flax, ramie, jute, kenaf, cannabis, Manila hemp, sisal hemp, New Zealand hemp), natural fibers such as capoc, banana and palm, semi-synthetic fibers such as acetate and triacetate, and rayon and cupra. , Contains regenerated fibers such as lyocell. The method for producing rayon, which is a regenerated fiber, may be a conventionally known method for producing viscose rayon fiber. Specifically, viscose having a cellulose content of about 7 to 10% and an alkali such as caustic soda in an amount of about 50 to 80% with respect to cellulose may be used. This is extruded from a spinning nozzle into an acidic solution containing sulfuric acid or the like and chemically reacted while forming fibers to regenerate cellulose and produce it. Further, the cellulosic fiber may be a functional cellulosic fiber containing the above-mentioned infrared absorber inside the fiber, and is not particularly limited. As the functional cellulosic fiber, for example, "Solar Touch (registered trademark)" manufactured by Omikenshi Co., Ltd. can be used. As the cellulosic fiber, a cellulosic fiber containing an infrared absorber inside the fiber and a cellulosic fiber not containing an infrared absorber may be used in combination. When the cellulosic fiber contains an infrared absorber inside the fiber, it preferably contains an ultraviolet absorber in an amount of 0.3 to 10% by weight, more preferably 0.5 to 7% by weight, still more preferably 1 to 5% by weight. %include. When the cellulosic fiber contains an infrared absorber inside the fiber, it is preferable that the infrared absorber is uniformly dispersed inside the fiber.

The fineness of the cellulosic fiber is not particularly limited, but is preferably 1 to 20 dtex, more preferably 1.5 to 15 dtex, from the viewpoint of spinnability, processability, texture and strength when made into a fabric. The fiber length of the cellulosic fiber is not particularly limited, but is preferably 38 to 127 mm, more preferably 38 to 76 mm, from the viewpoint of spinnability and processability.

<Polyester fiber>
As the polyester, at least one selected from the group consisting of terephthalic acid as a main acid component and alkylene glycol having 2 to 6 carbon atoms, that is, ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, and hexamethylene glycol. Glycol, particularly preferably a polyester containing ethylene glycol as a main glycol component is exemplified, and the above-mentioned functional polyester containing an infrared absorber may be used, and is not particularly limited.

In one or more embodiments of the present invention, the polyester fiber is composed of a polyester resin composition. The polyester-based resin composition means that the polyester-based resin is contained in an amount of more than 50% by weight when the total weight of the polyester-based resin composition is 100% by weight, and the polyester-based resin may be contained in an amount of 70% by weight or more. It is preferable to contain 80% by weight or more, more preferably 90% by weight or more, and even more preferably 95% by weight or more.

As the polyester-based resin, it is preferable to use one or more selected from the group consisting of polyalkylene terephthalate and copolymerized polyester mainly composed of polyalkylene terephthalate. In one or more embodiments of the present invention, the "copolymerized polyester mainly composed of polyalkylene terephthalate" refers to a copolymerized polyester containing 80 mol% or more of polyalkylene terephthalate.

The polyalkylene terephthalate is not particularly limited, and examples thereof include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polycyclohexanedimethylene terephthalate.

The copolymerized polyester mainly composed of polyalkylene terephthalate is not particularly limited, but for example, polyalkylene terephthalate such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polycyclohexanedimethylene terephthalate is mainly used, and other copolymerization components are used. Examples thereof include copolymerized polyester contained therein.

Other copolymerization components include, for example, isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, paraphenylenedicarboxylic acid, trimellitic acid, pyromellitic acid, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, and sebacic acid. , Polyvalent carboxylic acids such as dodecanedioic acid and their derivatives; dicarboxylic acids including sulfonates such as 5-sodium sulfoisophthalic acid, 5-sodium sulfoisophthalic acid dihydroxyethyl and their derivatives; 1,2-propanediol , 1,3-Propanediol, 1,4-Butanediol, 1,6-hexanediol, Neopentylglycol, 1,4-Cyclohexanedimethanol, Diethyleneglycol, Polyethylene glycol, Trimethylolpropane, Pentaerythritol, 4-Hydroxybenzoic acid Examples thereof include acid, ε-caprolactone, and ethylene glycol ether of bisphenol A.

From the viewpoint of stability and ease of operation, the copolymerized polyester is preferably produced by reacting the main polyalkylene terephthalate with a small amount of other copolymerizing components. As the polyalkylene terephthalate, a polymer of terephthalic acid and / or a derivative thereof (for example, methyl terephthalate) and alkylene glycol can be used. The copolymerized polyester is a mixture of terephthalic acid and / or a derivative thereof (for example, methyl terephthalate) used for the polymerization of the main polyalkylene terephthalate and alkylene glycol, and a monomer or a monomer which is a small amount of other copolymerization components. It may be produced by polymerizing a product containing an oligomer component.

The copolymerized polyester may be polycondensed with the above-mentioned other copolymerization components on the main chain and / or side chain of the main polyalkylene terephthalate, and the copolymerization method is not particularly limited.

Specific examples of the copolymerized polyester mainly composed of polyalkylene terephthalate include, for example, ethylene glycol ether of bisphenol A, 1,4-cyclohexadimethanol, isophthalic acid and dihydroxyethyl 5-sodium sulfoisophthalate mainly composed of polyethylene terephthalate. Examples thereof include polyester obtained by copolymerizing a kind of compound selected from the group consisting of.

The polyalkylene terephthalate and the copolymerized polyester mainly composed of the polyalkylene terephthalate may be used alone or in combination of two or more. Among them, polyethylene terephthalate; polypropylene terephthalate; polybutylene terephthalate; polyester mainly composed of polyethylene terephthalate and copolymerized with ethylene glycol ether of bisphenol A; polyester mainly composed of polyethylene terephthalate and copolymerized with 1,4-cyclohexanedimethanol; polyester. It is preferable to use polyester mainly composed of terephthalate and copolymerized with isophthalic acid; and polyester mainly composed of polyethylene terephthalate and copolymerized with dihydroxyethyl 5-sodium sulfoisophthalate alone or in combination of two or more.

The intrinsic viscosity (sometimes referred to as IV value) of the polyester resin is not particularly limited, but is preferably 0.3 dL / g or more and 1.2 dL / g or less, and 0.4 dL / g or more and 1.0 dL / g. It is more preferably g or less. When the intrinsic viscosity is 0.3 dL / g or more, the mechanical strength of the obtained fiber does not decrease and there is no risk of drip during the combustion test. Further, when the intrinsic viscosity is 1.2 dL / g or less, the molecular weight does not increase too much, the melt viscosity does not become too high, melt spinning becomes easy, and the fineness tends to be uniform.

The polyester resin composition may contain a flame retardant. The flame retardant is not particularly limited, and examples thereof include a phosphorus-based flame retardant and a bromine-based flame retardant.

The polyester-based resin composition may contain other resins in addition to the polyester-based resin. Examples of other resins include polyamide-based resins, vinyl chloride-based resins, modaacrylic-based resins, polycarbonate-based resins, polyolefin-based resins, and polyphenylene sulfide-based resins. As for other resins, one type may be used alone, or two or more types may be used in combination.

The fineness of the polyester fiber is not particularly limited, but is preferably 1 to 20 dtex, more preferably 1.5 to 15 dtex, from the viewpoint of spinnability, processability, texture and strength when made into a fabric. The fiber length of the polyester fiber is not particularly limited, but is preferably 38 to 127 mm, more preferably 38 to 76 mm, from the viewpoint of spinnability and processability.

It can be produced by melt-spinning a polyester-based resin composition in the same manner as in the case of general polyester-based fibers, except that a flame retardant, an infrared absorber, or the like is added to the polyester-based resin composition.

As the polyester fiber, a polyester fiber containing an infrared absorber inside the fiber and a polyester fiber not containing an infrared absorber may be used in combination. When the polyester fiber contains an infrared absorber inside the fiber, it preferably contains an ultraviolet absorber in an amount of 0.3 to 10% by weight, more preferably 0.5 to 7% by weight, still more preferably 1 to 5% by weight. %include. When the polyester fiber contains an infrared absorber inside the fiber, it is preferable that the infrared absorber is uniformly dispersed inside the fiber.

<Flame retardant>
In one or more embodiments of the invention, the flame retardancy of the fabric can be indicated by the limit oxygen index (LOI). The larger the LOI, the higher the flame retardancy of the fabric. In order for the fabric to have excellent flame retardancy, the LOI is preferably 26 or more, more preferably 28 or more, and most preferably 30 or more. This is because if the limit oxygen index is less than 25, it cannot be said that it is sufficient for making the fabric flame-retardant, and it is not at a level of safely self-extinguishing in combustion behavior.

<Flame-retardant fabric>
The flame-retardant fabric is an acrylic fiber containing 2 to 30% by weight of an antimony compound with respect to the total weight of the fiber from the viewpoint of heat insulation, flame retardancy, color development and texture. 35 to 65% by weight, cellulose fibers 25 to 45% by weight, polyester fibers 0 to 45% by weight, acrylic fibers 35 to 60% by weight, cellulose fibers 25 to 45% by weight. %, And 5 to 45% by weight of polyester fiber, more preferably 35 to 60% by weight of acrylic fiber, 30 to 45% by weight of cellulose fiber, and 5 to 40% by weight of polyester fiber. More preferably, it contains 35 to 55% by weight of acrylic fiber, 30 to 40% by weight of cellulose fiber, and 5 to 40% by weight of polyester fiber, and 35 to 50% by weight of acrylic fiber. It is even more preferable to contain 30 to 40% by weight of cellulose-based fibers and 10 to 40% by weight of polyester-based fibers. From the viewpoint of flame retardancy, the acrylic fiber preferably contains 3 to 20% by weight of the antimony compound with respect to the total weight of the fiber. The infrared absorber may be contained inside at least one of the acrylic fiber, the cellulose fiber and the polyester fiber, and further, for example, the acrylic fiber and the cellulose fiber contain the infrared absorber inside the fiber. Two or more fibers may contain an infrared absorber.

Further, from the viewpoint of improving the strength of the fabric, other fibers may be contained as long as the effect of the present invention is not impaired. Examples of other fibers include conductive fibers, aramid fibers and polyimide fibers. In the case of para or meta-aramid fibers, the fibers are contained in an amount of 5 to 20% by weight based on the total weight of the fabric. You may.

In the flame-retardant fabric, the fiber may be in the form of spun yarn. The thickness of the spun yarn is not particularly limited, but may be, for example, an English-style cotton count of 5 to 40 or 10 to 30. The yarn type may be a single yarn or a twin yarn.

The form of the flame-retardant fabric is not particularly limited, and may be, for example, a knitted fabric or a woven fabric. The structure of the knitted fabric is not particularly limited, and may be a round knit, a horizontal knit, or a warp knit. The structure of the woven fabric is not particularly limited, and may be a plain weave, a twill weave, a satin weave, or the like, or a patterned woven fabric using a special loom such as a dobby or a jaguar. From the viewpoint of excellent durability, the flame-retardant fabric is preferably a woven fabric, and more preferably a twill woven fabric.

The basis weight (weight per unit area) of the flame-retardant fabric is not particularly limited, but is preferably 3 to 10 oz / yd ² from the viewpoint of lightness and durability, and is preferably 4 to 9 oz / yd ² . More preferably, it is more preferably 4 to 8 oz / yd ² .

<Infrared source>
The infrared source is not particularly limited, and may be anything from a heating device such as sunlight, a stove, or a bonfire that irradiates a large amount of infrared rays to a human body that generates a small amount of infrared rays.

<Textile products>
The above-mentioned fabric may be used as the textile product, and the fabric is not particularly limited. Examples include duvet covers, mufflers, sunshades, hats, flameproof stuffing, insulation, filters, linings, tents, tarps, etc. Textile products may also contain other fabrics and fibers.

Hereinafter, the present invention will be described in more detail based on examples. The present invention is not limited to these examples.

The measurement and evaluation methods used in the examples and comparative examples are as follows.

(Transmittance)
For the transmittance of the fabric, the transmittance (%) at a wavelength of 250 to 2500 nm was measured with a V-770 spectrophotometer manufactured by Nippon Spectroscopy Co., Ltd., and the average value of the transmittance at a wavelength of 780 to 2500 nm was obtained. The transmittance was used. The band width was 5 nm (250 to 850 nm) and 20 nm (850 to 2500 nm).

(Heat shield rate)
The heat shield rate when the fabric was irradiated with infrared rays was determined based on the following, and the heat shield test was carried out under the following conditions.
Measurement environment: 20 ° C x 65% RH
Type of light source: Artificial solar lighting SERIC XC-500EFSS
Illuminance: 100,000 lux
The distance between the light source and the cloth was set to 50 cm, the front surface of the cloth was irradiated with the light source, a blackbody with a temperature sensor was installed at a place 10 cm away from the back surface of the cloth, and the temperature change after irradiating the light source for 20 minutes was measured. .. Moreover, after removing the cloth, the temperature change of the black body after irradiating with a light source for 20 minutes was measured. Further, the heat shield rate was calculated using the following mathematical formula (1).
[Formula 1]
Heat shield rate (%) = (AB) / A × 100
A: Blackbody temperature (° C) when there is no cloth, B: Blackbody temperature (° C) when there is cloth

(Flame retardance)
The limit oxygen index (LOI value) was measured in accordance with the combustibility test method according to the JIS-L 1091 E method oxygen index.

<Acrylic fiber manufacturing example i>
An acrylic copolymer consisting of 51% by weight of acrylonitrile, 48% by weight of vinylidene chloride and 1% by weight of sodium p-styrene sulfonic acid was dissolved in dimethylformamide so that the resin concentration was 30% by weight. Antimony-doped tin oxide (hereinafter, also referred to as Ti-ATO) supported on a titanium oxide base material in an amount of 5 parts by weight based on 100 parts by weight of the resin in the obtained resin solution (manufactured by Ishihara Sangyo Co., Ltd., product name "ET521W"). And 10 parts by weight of antimony trioxide (Sb ₂ O ₃ , manufactured by Nihon Seiko Co., Ltd., product name "Patox-M") and 5 parts by weight of titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., product name "R-22L") are added. Then, it was used as a spinning stock solution. The obtained undiluted spinning solution was extruded into a 50 wt% dimethylformamide aqueous solution using a nozzle with a nozzle hole diameter of 0.08 mm and a hole number of 300 holes to coagulate it, then washed with water and dried at 120 ° C., and tripled after drying. After stretching, an acrylic fiber was obtained by further heat-treating at 145 ° C. for 5 minutes. The obtained acrylic fiber of Production Example i had a fineness of 1.7 dtex, a strength of 2.4 cN / dtex, an elongation of 25%, and a cut length of 51 mm. In the production example of the acrylic fiber, the fineness, strength and elongation of the acrylic fiber were measured based on JIS L 1015. The acrylic fiber of Production Example i contained Ti-ATO inside the fiber, and the content of Ti-ATO with respect to the total weight of the acrylic fiber was 4.2% by weight.

<Acrylic fiber manufacturing example ii>
To the obtained resin solution, 10 parts by weight of antimony trioxide (Sb ₂ O ₃ , manufactured by Nihon Seiko Co., Ltd., product name "Patox-M") was added to 100 parts by weight of the resin to prepare a spinning stock solution. Obtained an acrylic fiber in the same manner as in Production Example i. The obtained acrylic fiber of Production Example ii had a fineness of 1.7 dtex, a strength of 2.6 cN / dtex, an elongation of 27%, and a cut length of 51 mm.

<Production example of acrylic fiber iii>
In the obtained resin solution, 2.6 parts by weight of carbon black (CB, CABOT, product name "BLACK PEARLS") and 10 parts by weight of antimony trioxide (Sb ₂ O ₃ , Japan) with respect to 100 parts by weight of the resin. Acrylic fibers were obtained in the same manner as in Production Example i, except that a product name "Patox-M" manufactured by Seiko Co., Ltd. was added to prepare a spinning stock solution. The obtained acrylic fiber of Production Example iii had a fineness of 1.7 dtex, a strength of 2.2 cN / dtex, an elongation of 24%, and a cut length of 51 mm. Further, the acrylic fiber of Production Example iii contained carbon black inside the fiber, and the content of carbon black with respect to the total weight of the acrylic fiber was 2.3% by weight.

<Manufacturing examples 1 to 9 of spun yarn>
Acrylic fibers and cellulose fibers obtained in the above production examples i to iii (“Tencel®” manufactured by Lenting Co., Ltd., fineness 1.4 dtex, cut length 38 mm, hereinafter also referred to as “Lyocell”), fiber interior. Cellulous fiber containing an infrared absorber (metal oxide) ("Solar Touch (registered trademark)" manufactured by Omikenshi Co., Ltd., infrared absorber content 3% by weight, fineness 1.4 dtex, cut length 38 mm, " Solar touch), polyester fiber ("Tetron (registered trademark)" manufactured by Teijin Frontier, fineness 1.7dtex, cut length 38mm, hereinafter also referred to as "PET"), para-aramid fiber (Yantai Taiho Advanced Materials Co.) ., Made by LTD, product name "Taparan (registered trademark)", fineness 1.7 dtex, cut length 51 mm, hereinafter also referred to as "p-Aramid"), and meta-aramid fiber (manufactured by Teijin, product name "Conex (registered trademark)". , Fineness 1.7 dtex, cut length 51 mm, also referred to as "m-Aramid" in the following) were mixed at the ratio shown in Table 1 below and spun by ring spinning, all of which were blended yarns with an English cotton count of 20 (20). / 1) was manufactured.

(Example 1)
The spun yarn of Production Example 1 was used for the warp yarn and the weft yarn to prepare a woven fabric having a 2/1 twill structure. The number of threads to be driven was 76 threads / 1 inch for warp threads, 54 threads / 1 inch for weft threads, and a basis weight of 5.5 oz / yd ² (hereinafter, also referred to as osy).

(Example 2)
The spun yarn of Production Example 2 was used for the warp yarn and the weft yarn to prepare a woven fabric having a 2/1 twill structure. The number of threads to be driven was 80 threads / 1 inch for the warp threads, 60 threads / 1 inch for the weft threads, and the basis weight of the obtained woven fabric was 5.0 oz / yd ² .

(Example 3)
A woven fabric was produced in the same manner as in Example 1 except that the spun yarn of Production Example 3 was used for the warp yarn and the weft yarn. The basis weight of the obtained woven fabric was 5.5 oz / yd ² .

(Example 4)
A woven fabric was produced in the same manner as in Example 1 except that the spun yarn of Production Example 4 was used for the warp yarn and the weft yarn. The basis weight of the obtained woven fabric was 5.8 oz / yd ² .

(Comparative Example 1)
A woven fabric was produced in the same manner as in Example 1 except that the spun yarn of Production Example 5 was used for the warp yarn and the weft yarn. The basis weight of the obtained woven fabric was 5.8 oz / yd ² .

(Comparative Example 2)
A woven fabric was produced in the same manner as in Example 2 except that the spun yarn of Production Example 6 was used for the warp yarn and the weft yarn. The basis weight of the obtained woven fabric was 5.9 oz / yd ² .

(Comparative Example 3)
A woven fabric was produced in the same manner as in Example 2 except that the spun yarn of Production Example 7 was used for the warp yarn and the weft yarn. The basis weight of the obtained woven fabric was 5.0 oz / yd ² .

(Comparative Example 4)
A woven fabric was produced in the same manner as in Example 2 except that the spun yarn of Production Example 8 was used for the warp yarn and the weft yarn. The basis weight of the obtained woven fabric was 5.5 oz / yd ² .

(Comparative Example 5)
A woven fabric was produced in the same manner as in Example 2 except that the spun yarn of Production Example 9 was used for the warp yarn and the weft yarn. The basis weight of the obtained woven fabric was 5.8 oz / yd ² .

The transmittance and heat shielding rate of the woven fabrics obtained in Examples and Comparative Examples were measured as described above, and the results are shown in Table 2 below.

As can be seen from Table 2, the flame-retardant fabric of the example has a low transmittance of near-infrared rays, the temperature rise on the back surface side of the surface irradiated with the near-infrared rays of the fabric is suppressed, and the heat shielding rate is also high. rice field.

The present invention is not particularly limited, but preferably includes at least the following embodiments.
[1] It is a flame-retardant fabric and is
Limiting oxygen index is 26 or more,
Contains 1.0% by weight or more and 20% by weight or less of an infrared absorber with respect to the total weight of the flame-retardant fabric.
Near infrared transmittance is less than 11%,
The infrared absorber is contained inside the fibers constituting the flame-retardant fabric.
The infrared absorber is a flame-retardant fabric, characterized in that it does not contain carbon black.
[2] The flame-retardant fabric according to [1], wherein the flame-retardant fabric contains at least one fiber selected from the group consisting of acrylic fibers, cellulosic fibers, and polyester fibers.
[3] The flame-retardant fabric according to [1] or [2], wherein the infrared absorber is uniformly dispersed inside the fiber.
[4] The flame-retardant fabric according to [2] or [3], wherein the acrylic fiber contains an antimony compound as a flame retardant.
[5] The flame-retardant fabric according to any one of [1] to [4], wherein the fiber has a single fiber fineness of 1 to 20 dtex.
[6] The flame-retardant fabric contains 35 to 65% by weight of acrylic fibers containing 3 to 20% by weight of an antimon compound, 25 to 45% by weight of cellulosic fibers, and 0 to 45% by weight of polyester fibers. The flame-retardant fabric according to any one of [1] to [5], which comprises.
[7] The flame-retardant fabric according to [6], wherein the acrylic fiber contains an infrared absorber.
[8] The flame-retardant fabric according to [6] or [7], wherein the cellulosic fiber contains an infrared absorber.
[9] The flame-retardant fabric according to any one of [1] to [8], which has a heat shield rate of 45.0% or more.
[10] A textile product comprising the flame-retardant fabric according to any one of [1] to [9].

Claims

It is a flame-retardant fabric
Limiting oxygen index is 26 or more,
Contains 1.0% by weight or more and 20% by weight or less of an infrared absorber with respect to the total weight of the flame-retardant fabric.
Near infrared transmittance is less than 11%,
The infrared absorber is contained inside the fibers constituting the flame-retardant fabric.
The infrared absorber is a flame-retardant fabric, characterized in that it does not contain carbon black.
The flame-retardant fabric according to claim 1, wherein the flame-retardant fabric contains at least one fiber selected from the group consisting of acrylic fibers, cellulosic fibers, and polyester fibers.
The flame-retardant fabric according to claim 1 or 2, wherein the infrared absorber is uniformly dispersed inside the fiber.
The flame-retardant fabric according to claim 2 or 3, wherein the acrylic fiber contains an antimony compound as a flame retardant.
The flame-retardant fabric according to any one of claims 1 to 4, wherein the fiber has a fineness of 1 to 20 dtex.
The flame-retardant fabric is claimed to contain 35 to 65% by weight of acrylic fibers containing 3 to 20% by weight of an antimon compound, 25 to 45% by weight of cellulosic fibers, and 0 to 45% by weight of polyester fibers. Item 5. The flame-retardant fabric according to any one of Items 1 to 5.
The flame-retardant fabric according to claim 6, wherein the acrylic fiber contains an infrared absorber.
The flame-retardant fabric according to claim 6 or 7, wherein the cellulosic fiber contains an infrared absorber.
The flame-retardant fabric according to any one of claims 1 to 8, which has a heat shield rate of 45.0% or more.
A textile product comprising the flame-retardant fabric according to any one of claims 1 to 9.