阅读说明：本技术 电弧防护服用布帛及电弧防护服 (Fabric for arc protective clothing and arc protective clothing ) 是由 大关达郎 内堀惠太 见尾渡 田中康规 宇都宫裕人 于 2015-12-11 设计创作，主要内容包括：本发明涉及电弧防护服用布帛及电弧防护服,所述电弧防护服用布帛的特征在于,其含有纤维素系纤维、红外线吸收剂和阻燃剂,其对波长为750～2500nm的入射光的平均总反射率为60％以下,该平均总反射率如下测定算出：(1)使用分光光度计测定布帛的总反射率,(2)使用分光光度计测定布帛的透射率,(3)使用总反射率(R)及透射率(t1),利用下述联立方程式算出吸光率(a1),式中,r1表示布帛的反射率,(4)在以所得入射光的波长为横轴、以总反射率为纵轴的总反射率的曲线图中,计算在被波长为750nm～2500nm、总反射率为0％～100％包围的面积内,总反射率的曲线下方部分所占面积的比例,作为平均总反射率。1＝r<Sub>1</Sub>+t<Sub>1</Sub>+a<Sub>1</Sub>.......(1)<Image he="88" wi="700" file="DDA0002229003240000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>(The present invention relates to a fabric for arc protective clothing, which contains a cellulose fiber, an infrared absorber and a flame retardant, and has an average total reflectance of 60% or less with respect to incident light having a wavelength of 750 to 2500nm, the average total reflectance being calculated by the following measurement: (1) the total reflectance of the fabric was measured using a spectrophotometer, (2) the transmittance of the fabric was measured using a spectrophotometer, (3) the absorbance (a1) was calculated using the following simultaneous equation using the total reflectance (R) and the transmittance (t1), where R1 represents the reflectance of the fabric, and (4) the proportion of the area occupied by the lower part of the curve of the total reflectance in the area surrounded by the total reflectance of 0% to 100% at wavelengths of 750nm to 2500nm was calculated as the average total reflectance in a graph of the total reflectance with the wavelength of the obtained incident light as the abscissa and the total reflectance as the ordinate. 1 ═ r 1 +t 1 +a 1 .......(1))

1. A fabric for arc protective clothing, which is a fabric comprising a cellulose fiber, and which further comprises an infrared absorber and a flame retardant, and which has an average total reflectance of 60% or less with respect to incident light having a wavelength of 750 to 2500nm, the average total reflectance being calculated by the following measurement:

(1) first, the total reflectance of the fabric was measured using a spectrophotometer,

(2) subsequently, the transmittance of the fabric was measured using a spectrophotometer,

(3) the absorbance (a1) was calculated from the total reflectance (R) and the transmittance (t1) by the following simultaneous equation in which R1 represents the reflectance of the fabric [ equation 1]

1＝r₁+t₁+a₁…………………………·(1)

(4) In a graph of total reflectance with the wavelength of the obtained incident light as the horizontal axis and the total reflectance as the vertical axis, the proportion of the area occupied by the lower part of the curve of the total reflectance in the area surrounded by the wavelengths of 750nm to 2500nm and the total reflectance of 0% to 100% is calculated as the average total reflectance for the incident light with the wavelength of 750nm to 2500 nm.

2. The fabric for arc protective clothing according to claim 1, wherein,

the infrared absorber is a tin oxide compound.

3. The fabric for arc protective clothing according to claim 1, wherein,

the infrared absorber is one or more tin oxide compounds selected from antimony-doped tin oxide, indium tin oxide, niobium-doped tin oxide, phosphorus-doped tin oxide, fluorine-doped tin oxide, and antimony-doped tin oxide supported on a titanium oxide substrate.

4. The fabric for arc protective clothing according to any one of claims 1 to 3, wherein,

the fabric contains 0.15 to 5 wt% of an infrared absorber relative to the total weight of the fabric.

5. The fabric for arc protective clothing according to any one of claims 1 to 3, wherein,

the flame retardant is a phosphorus flame retardant.

6. The fabric for arc protective clothing according to any one of claims 1 to 3, wherein,

the flame retardant is more than one phosphorus compound selected from N-hydroxymethyl phosphonate compounds and tetrahydroxyalkyl phosphonium salts.

7. The fabric for arc protective clothing according to any one of claims 1 to 3, wherein,

the fabric contains 5-30 wt% of a flame retardant based on the total weight of the fabric.

8. The fabric for arc protective clothing according to any one of claims 1 to 3, wherein,

the fabric further contains aramid fibers.

9. The fabric for arc protective clothing according to any one of claims 1 to 3, wherein,

the arc protective clothing fabric has a weight per unit area of 8oz/yd²When the ATPV value is 8cal/cm, as determined by ASTM F1959/F1959M-12, which is a standard test method for determining the arc rating of garment materials²The above.

10. An arc protective clothing comprising the arc protective clothing fabric according to any one of claims 1 to 9.

Technical Field

The present invention relates to arc-resistant acrylic fibers having arc resistance, arc protective clothing fabrics, and arc protective clothing.

Background

In recent years, a large number of accidents caused by arc flash have been reported, and in order to prevent the risk of arc flash, protective clothing worn by workers who work in an environment where there is a risk of actual exposure to an arc, such as power maintenance personnel and factory workers, has been studied to have arc resistance.

For example, patent documents 1 and 2 describe protective clothing using an arc protection yarn or fabric containing modacrylic fiber (modacrylic fiber) and aramid fiber. Patent document 3 describes that a yarn or fabric containing an antimony-containing modacrylic fiber, a flame-retardant acrylic fiber, and an aramid fiber is used in arc protection clothing.

Disclosure of Invention

Technical problem to be solved by the invention

However, in patent documents 1 and 3, improvement of the arc resistance of modacrylic fibers by adjusting the amount of modacrylic fibers or aramid fibers blended to impart arc resistance to yarns or fabrics has not been studied. In addition, in patent document 2, improvement of the arc resistance of modacrylic fibers by providing arc resistance to a blend product of modacrylic fibers and aramid fibers in which the amount of antimony is reduced has not been studied.

The invention provides an arc-resistant acrylic fiber having arc resistance, an arc protective clothing fabric, and an arc protective clothing.

Means for solving the technical problem

The present invention relates to an arc-resistant acrylic fiber comprising an acrylic polymer, wherein the acrylic fiber contains an infrared absorber in an amount of 1 to 30 wt% based on the total weight of the acrylic polymer.

The present invention also relates to a fabric for arc protective clothing, which contains the arc-resistant acrylic fiber, and is characterized in that the content of the infrared absorber is 0.5 wt% or more based on the total weight of the fabric.

The infrared absorber is preferably a tin oxide compound, and more preferably 1 or more selected from antimony-doped tin oxide, indium tin oxide, niobium-doped tin oxide, phosphorus-doped tin oxide, fluorine-doped tin oxide, and antimony-doped tin oxide supported on a titanium oxide substrate.

The arc-resistant acrylic fiber preferably further contains an ultraviolet absorber. The ultraviolet absorber is more preferably titanium oxide.

The acrylic polymer preferably contains 40 to 70 wt% of acrylonitrile and 30 to 60 wt% of other components based on the total weight of the acrylic polymer.

The arc protective clothing fabric preferably further contains an aramid fiber. Further, the arc protective clothing fabric preferably further contains a cellulose fiber.

The fabric for arc protective clothing preferably has a weight per unit area of 8oz/yd²When ATPV value measured according to ASTM F1959/F1959M-12(Standard Test Method for Determining the Arc Rating of Material for Clothing) is 8cal/cm²The above.

The arc protection clothing fabric preferably has an average total reflectance of 50% or less with respect to incident light having a wavelength of 750 to 2500 nm.

The present invention also relates to a fabric for arc protective clothing, which is a fabric containing a cellulose fiber, and is characterized in that the fabric further contains an infrared absorber and a flame retardant, and the average total reflectance of incident light having a wavelength of 750 to 2500nm is 60% or less.

The present invention also relates to arc protective clothing, which is characterized by comprising the arc protective clothing fabric.

Effects of the invention

The present invention provides an arc-resistant acrylic fiber having arc resistance by including an infrared absorber in the acrylic fiber. Further, by incorporating an acrylic fiber and an infrared absorber into the fabric, it is possible to provide an arc protective clothing fabric having arc resistance and an arc protective clothing comprising the fabric. Further, the present invention can provide an arc protective clothing fabric having arc resistance and arc protective clothing including the fabric, by further including an infrared absorber and a flame retardant in the fabric including a cellulose fiber, and by setting the average total reflectance to incident light having a wavelength of 750 to 2500nm to 60% or less.

Drawings

FIG. 1 is a graph showing the total reflectance of the fabric of the example in the wavelength region of 250 to 2500 nm.

FIG. 2 is a graph showing the total reflectance of the fabric of the comparative example in the wavelength region of 250 to 2500 nm.

FIG. 3 is a graph showing the total reflectance of the fabric of the example in the wavelength region of 250 to 2500 nm.

FIG. 4 is a graph showing the total reflectance of the fabric of the example in the wavelength region of 250 to 2500 nm.

FIG. 5 is a graph showing the absorbance in the wavelength region of 250 to 2500nm of the fabric of the example.

FIG. 6 is a graph showing the total reflectance in the wavelength region of 250 to 2500nm of the fabrics of examples and comparative examples.

Fig. 7 is a schematic explanatory view of a measurement method for measuring the total reflectance of the fabric with respect to incident light.

Fig. 8 is a schematic explanatory view of a measurement method for measuring the transmittance of the fabric to incident light.

Detailed Description

The present inventors have conducted intensive studies to impart arc resistance to a fiber or fabric, and as a result, have found that: the present inventors have completed the present invention by incorporating an infrared absorber in an acrylic fiber and adjusting the reflection and/or absorption of light, thereby imparting arc performance to the acrylic fiber and using the acrylic fiber as an arc-resistant fiber. In general, the heat retaining property is imparted by incorporating an infrared absorber into the fiber to absorb infrared as heat ray, but the present inventors have surprisingly found that by incorporating an infrared absorber into an acrylic fiber or an acrylic fiber-containing fabric to absorb light in the infrared region, the acrylic fiber or the acrylic fiber-containing fabric exhibits high arc resistance. Further, the present invention has been accomplished by the finding that a fabric containing a cellulose fiber can be used as an arc-resistant fabric by adding an infrared absorber and a flame retardant to the fabric and by setting the average total reflectance of the fabric to 60% or less with respect to incident light having a wavelength of 750 to 2500 nm.

(arc-resistant acrylic fiber)

The arc-resistant acrylic fiber contains an infrared absorber. The infrared absorber may be present in the fiber or may be attached to the surface of the fiber. The infrared absorber is preferably present inside the fiber from the viewpoint of hand and washing resistance. The arc-resistant acrylic fiber contains 1 to 30 wt% of an infrared absorber based on the total weight of the acrylic polymer. When the content of the infrared absorber is 1 wt% or more, the acrylic fiber has high arc resistance. When the content of the infrared absorber is 30% by weight or less, the hand feeling becomes good. From the viewpoint of improving arc resistance, the arc-resistant acrylic fiber preferably contains the infrared absorber in an amount of 2 wt% or more, more preferably 3 wt% or more, and still more preferably 5 wt% or more, based on the total weight of the acrylic polymer. From the viewpoint of hand feeling, the arc-resistant acrylic fiber preferably contains the infrared absorber in an amount of 28 wt% or less, more preferably 26 wt% or less, and still more preferably 25 wt% or less, based on the total weight of the acrylic polymer.

The infrared absorber is not particularly limited as long as it has an infrared absorbing effect. Examples thereof include antimony-doped tin oxide, indium tin oxide, niobium-doped tin oxide, phosphorus-doped tin oxide, fluorine-doped tin oxide, antimony-doped tin oxide supported on a titanium oxide substrate, 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 arc resistance, the infrared absorber is preferably a tin oxide-based compound, more preferably 1 or more selected from antimony-doped tin oxide, indium tin oxide, niobium-doped tin oxide, phosphorus-doped tin oxide, fluorine-doped tin oxide, and antimony-doped tin oxide supported on a titanium oxide substrate, more preferably 1 or more selected from antimony-doped tin oxide and antimony-doped tin oxide supported on a titanium oxide substrate, and still more preferably antimony-doped tin oxide supported on a titanium oxide substrate. The infrared absorbing agent may be used alone or in combination of 2 or more.

The particle diameter of the infrared absorber is preferably 2 μm or less, more preferably 1 μm or less, and still more preferably 0.5 μm or less, from the viewpoint of being easily dispersed in an acrylic polymer constituting the acrylic fiber. When the particle diameter of the infrared absorber is within the above range, the dispersibility of the infrared absorber on the fiber surface of the acrylic fiber is also improved. In the present invention, the particle diameter of the infrared absorber can be measured by a laser diffraction method in the case of a powder, and can be measured by a laser diffraction method or a dynamic light scattering method in the case of a dispersion (dispersion liquid) dispersed in water or an organic solvent.

The arc-resistant acrylic fiber preferably further contains an ultraviolet absorber. The arc resistance is further improved by absorbing light in the ultraviolet region in addition to the infrared region. The ultraviolet absorber is not particularly limited, and for example, inorganic compounds such as titanium oxide and zinc oxide, organic compounds such as triazine compounds, benzophenone compounds and benzotriazole compounds, and the like can be used. Among them, titanium oxide is preferable from the viewpoint of the coloring degree. The arc-resistant acrylic fiber preferably contains 0.3 to 10 wt%, more preferably 0.5 to 7 wt%, and still more preferably 1 to 5 wt% of an ultraviolet absorber, based on the total weight of the acrylic polymer. The arc resistance is improved, and the hand feeling is also good.

The particle diameter of the ultraviolet absorber is preferably 2 μm or less, more preferably 1.5 μm or less, and still more preferably 1 μm or less, from the viewpoint of being easily dispersed in an acrylic polymer constituting the acrylic fiber. When the particle diameter of the ultraviolet absorber is within the above range, the dispersibility of the ultraviolet absorber on the fiber surface of the acrylic fiber is also improved. In the case of titanium oxide, the particle diameter is preferably 0.4 μm or less, more preferably 0.2 μm or less. The particle size of the compound dissolved in the organic solvent used in the production of the spinning solution with the organic ultraviolet absorber is not limited. In the present invention, the particle diameter of the ultraviolet absorber can be measured by a laser diffraction method in the case of a powder, and can be measured by a laser diffraction method or a dynamic light scattering method in the case of a dispersion dispersed in water or an organic solvent.

The arc-resistant acrylic fiber is preferably composed of an acrylic polymer containing 40 to 70 wt% of acrylonitrile and 30 to 60 wt% of other components, based on the total weight of the acrylic polymer. When the content of acrylonitrile in the acrylic polymer is 40 to 70 wt%, the acrylic fiber has good heat resistance and flame retardancy.

The other component is not particularly limited as long as it is copolymerizable with acrylonitrile. Examples thereof include halogen-containing vinyl monomers and sulfonic acid group-containing monomers.

Examples of the halogen-containing vinyl monomer include halogen-containing vinyl and vinylidene halide. Examples of the halogen-containing vinyl include vinyl chloride and vinyl bromide, and examples of the vinylidene halide include vinylidene chloride and vinylidene bromide. These halogen-containing vinyl monomers may be used in a combination of 1 or 2 or more. The arc-resistant acrylic fiber preferably contains 30 to 60 wt% of a halogen-containing vinyl monomer as another component based on the total weight of the acrylic polymer from the viewpoint of heat resistance and flame retardancy.

Examples of the sulfonic acid group-containing monomer include methacrylic sulfonic acid, allyl sulfonic acid, styrene sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid, and salts thereof. Examples of the salt include, but are not limited to, sodium salts such as sodium p-styrenesulfonate, potassium salts, and ammonium salts. These sulfonic acid group-containing monomers may be used in 1 kind or in combination of 2 or more kinds. The sulfonic acid group-containing monomer is used as needed, but when the content of the sulfonic acid group-containing monomer in the acrylic polymer is 3% by weight or less, the production stability in the spinning step is excellent.

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

The arc-resistant acrylic fiber may further contain an antimony compound. The content of the antimony compound in the acrylic fiber is preferably 1.6 to 33 wt%, more preferably 3.8 to 21 wt%, 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 in the spinning step is excellent and the flame retardancy is good.

Examples of the antimony compound include salts of antimonic acid such as antimony trioxide, antimony tetraoxide, antimony pentoxide, antimonic acid, sodium antimonate, etc., antimony oxychloride, etc., and 1 kind or a combination of 2 or more of these compounds may be used. From the viewpoint of production stability in the spinning step, it is preferable that the antimony compound is at least 1 compound selected from antimony trioxide, antimony tetraoxide, and antimony pentaoxide.

The fineness of the arc-resistant acrylic fiber is not particularly limited, but is preferably 1 to 20dtex, more preferably 1.5 to 15dtex, from the viewpoint of the hand and strength when the acrylic fiber is made into a fabric. The fiber length of the acrylic fiber is not particularly limited, but is preferably 38 to 127mm, and more preferably 38 to 76mm, from the viewpoint of strength. In the present invention, the fineness of the fiber is measured in accordance with JIS L1015.

The strength of the arc-resistant acrylic fiber is not particularly limited, but is preferably 1.0 to 4.0cN/dtex, more preferably 1.5 to 3.0cN/dtex, from the viewpoint of spinning and processability. The elongation of the arc-resistant acrylic fiber is not particularly limited, but is preferably 20 to 35%, more preferably 20 to 25%, from the viewpoint of textile properties and processability. In the present invention, the strength and elongation of the fiber are measured according to JIS L1015.

The arc-resistant acrylic fiber can be produced by wet spinning as in the case of a normal acrylic fiber, except that an infrared absorber, an ultraviolet absorber, or the like is added to the spinning solution. Alternatively, the acrylic fiber may be impregnated with an aqueous dispersion of an infrared absorber or an ultraviolet absorber to attach the infrared absorber or the ultraviolet absorber to the acrylic fiber. In this case, a binder used in fiber processing may also be used.

The arc resistance of the arc-resistant acrylic fiber can be evaluated by the relative value of the arc resistance to the aramid fiber. Specifically, the evaluation can be made by using the relative value of the ratio ATPV of 100 wt% of the arc-resistant acrylic fiber to 100 wt% of the aramid fiber. Specific ATPV ((cal/cm)²)/(oz/yd²) Is the weight per unit area (oz/yd) obtained by dividing ATPV by the weight per unit area²) ATPV (cal/cm)²) ATPV (Arc thermal Performance value, Arc thermal Performance ratio) was determined using an Arc test based on ASTM F1959/F1959M-12(Standard test Method for Determining the Arc Rating of Materials for cloning). Since ATPV is affected by the type of fabric, it is necessary to evaluate ATPV using the same type of fabric. The arc resistance of the arc resistant acrylic fiber can be evaluated by the method described later when the same type of fabric or 100 wt% of arc resistant acrylic fiber is not present.

(arc protective clothing)

The arc protective clothing fabric of the present invention will be explained below. First, the arc protective clothing fabric according to embodiment 1 will be described.

(embodiment mode 1)

The arc protective clothing fabric according to embodiment 1 of the present invention contains the arc-resistant acrylic fiber, and the content of the infrared absorber is 0.5 wt% or more based on the total weight of the fabric. From the viewpoint of arc resistance, the content of the infrared absorber is preferably 1 wt% or more, more preferably 5 wt% or more, based on the total weight of the fabric. From the viewpoint of hand, the arc protective clothing fabric preferably contains the infrared absorber in an amount of 10 wt% or less based on the total weight of the fabric. As the infrared ray absorber, the same one as used for the arc-resistant acrylic fiber described above can be used.

The arc protective clothing fabric preferably further contains an ultraviolet absorber in an amount of 0.15 to 5 wt%, more preferably 0.75 to 3.5 wt%, and still more preferably 0.5 to 2.5 wt% based on the total weight of the fabric. As the ultraviolet absorber, the same ultraviolet absorbers as those used for the arc-resistant acrylic fibers can be used.

The arc protective clothing fabric preferably contains aramid fibers from the viewpoint of durability. The aramid fiber can be para-aramid fiber or meta-aramid fiber. The fineness of the aramid fiber is not particularly limited, and is preferably 1 to 20dtex, more preferably 1.5 to 15dtex, from the viewpoint of strength. The fiber length of the aramid fiber is not particularly limited, and is preferably 38 to 127mm, and more preferably 38 to 76mm, from the viewpoint of strength.

The arc protective clothing fabric preferably contains 5 to 30 wt%, more preferably 10 to 20 wt%, of the aramid fiber, based on the total weight of the fabric. When the content of the aramid fiber in the arc protective clothing fabric is within the above range, the durability of the fabric can be improved.

The arc protective clothing fabric may further contain a cellulose fiber from the viewpoint of hand feeling. The cellulose-based fiber is not particularly limited, and a natural cellulose-based fiber is preferably used from the viewpoint of durability. Examples of the natural cellulose fibers include cotton (cotton), kapok (kabok), flax (linen), ramie (ramie), and jute (jute). The natural cellulose fibers may be flame-retardant cellulose fibers obtained by subjecting natural cellulose fibers such as cotton (cotton), kapok (kabok), flax (linen), ramie (ramie), and jute (Jute) to flame-retardant treatment using a flame retardant such as a phosphorus compound such as an N-hydroxymethylphosphonate compound or a tetrahydroxyalkylphosphonium salt. These natural cellulose fibers may be used in 1 kind or in combination of 2 or more kinds. From the viewpoint of strength, the natural cellulose fiber preferably has a fiber length of 15 to 38mm, more preferably 20 to 38 mm.

The arc protective clothing fabric preferably contains 30 to 60 wt%, more preferably 30 to 50 wt%, and still more preferably 35 to 40 wt% of natural cellulose fibers, based on the total weight of the fabric. When the content of the natural cellulose fiber in the arc protective clothing fabric is within the above range, the fabric can be provided with excellent texture and moisture absorption, and the durability of the fabric can be improved.

The arc protective clothing fabric may further contain acrylic fibers (hereinafter, also referred to as "other acrylic fibers") other than the arc-resistant acrylic fibers. The other acrylic fiber is not particularly limited, and all acrylic fibers containing no infrared absorber can be used. As the other acrylic fiber, an acrylic fiber containing an antimony compound such as antimony oxide may be used, or an acrylic fiber containing no antimony compound may be used.

The arc protective clothing fabric preferably contains the acrylic fiber in an amount of 30 wt% or more, more preferably 35 wt% or more, and further preferably 40 wt% or more, in total, based on the total weight of the fabric, from the viewpoint of heat resistance.

The weight per unit area (weight per one ounce of fabric per unit area (1 square yard, 1 square yard)) of the fabric for arc protection clothing is preferably 3 to 10oz/yd²More preferably 4 to 9oz/yd²More preferably 4 to 8oz/yd². When the weight per unit area is within the above range, protective clothing that is light in weight and excellent in workability can be provided.

The arc protective clothing fabric has a weight per unit area of 8oz/yd²In the following, the ATPV value measured in accordance with ASTM F1959/F1959M-12(Standard Test Method for Determining the Arc Rating of materials for cloning) is preferably 8cal/cm²The above. Can be used forCan provide light-weight protective clothing with good arc resistance. ATPV per unit area weight, i.e. specific ATPV (cal/cm)²)/(oz/yd²) Preferably 1.1 or more, more preferably 1.2 or more, and further preferably 1.3 or more.

The arc protective clothing fabric preferably has an average total reflectance of 50% or less, more preferably 40% or less, further preferably 30% or less, and further preferably 20% or less, with respect to incident light having a wavelength of 750 to 2500 nm. When the average total reflectance of incident light having a wavelength of 750 to 2500nm is within the above range, the infrared ray absorption ability is high and the arc resistance is excellent. In addition, the arc protective clothing fabric preferably has a total reflectance of 30% or less, more preferably 25% or less, and even more preferably 20% or less in a wavelength region of 2000nm or more, from the viewpoints of high infrared ray absorption ability and excellent arc resistance. In this manner, the arc protective clothing fabric absorbs incident light having a wavelength of 750 to 2500nm (light in the infrared region) without reflecting, so that the surface directly irradiated with an arc is carbonized during arc irradiation, and transmitted light can be further reduced. In the present invention, the total reflectance of the fabric can be measured on either the front surface or the back surface. The arc protective clothing fabric preferably has a difference in average total reflectance with respect to incident light having a wavelength of 750 to 2500nm of 10% or less, more preferably 5% or less, and even more preferably 0% in total reflectance measurement with the front surface as a measurement surface and total reflectance measurement with the back surface as a measurement surface.

Examples of the form of the fabric for arc protective clothing include woven fabric, knitted fabric, and nonwoven fabric, but are not limited thereto. In addition, the textile fabric can be warp-knitted, and the knitted fabric can also be warp-knitted.

The arc protective clothing fabric is not particularly limited, and is preferably 0.3 to 1.5mm, more preferably 0.4 to 1.3mm, and even more preferably 0.5 to 1.1mm in thickness from the viewpoint of strength and comfort of the fabric as a work clothing. The thickness was measured according to JIS L1096 (2010).

The weave of the woven fabric is not particularly limited, and may be a three-dimensional weave such as a plain weave, a twill weave, and a satin weave, or a pattern woven fabric using a special loom such as a dobby loom (dobby loom) or a Jacquard loom (jacqard loom). The structure of the knitted fabric is not particularly limited, and may be any of circular knitting, flat knitting, and warp knitting. The fabric is preferably a woven fabric, and more preferably a twill woven fabric, from the viewpoint of high tear strength and excellent durability.

The arc protective clothing fabric may be formed by forming a fiber mixture containing arc-resistant acrylic fibers containing an infrared absorber into a fabric, or may be formed by attaching an infrared absorber to a fabric containing acrylic fibers. When the infrared absorbent is attached to the fabric containing acrylic fiber, the infrared absorbent is also attached to the acrylic fiber. For example, by impregnating a fabric containing acrylic fibers with an aqueous dispersion in which an infrared absorbing agent is dispersed, the infrared absorbing agent can be attached to the fabric and the infrared absorbing agent can also be attached to the acrylic fibers. In this case, a binder used in fiber processing may be used.

(embodiment mode 2)

The fabric for arc protection clothing according to embodiment 2 of the present invention contains a cellulose fiber, an infrared absorber and a flame retardant, and has an average total reflectance of 60% or less for incident light having a wavelength of 750 to 2500 nm.

The cellulose-based fiber is not particularly limited, and a natural cellulose fiber is preferably used from the viewpoint of durability. As the natural cellulose fiber, for example, cotton (cotton), kapok (kabok), flax (linen), ramie (ramie), jute (Jute), or the like can be used, and among them, cotton (cotton) is preferable from the viewpoint of more excellent durability. These natural cellulose fibers may be used in 1 kind, or 2 or more kinds may be used in combination.

The natural cellulose fiber preferably has a fiber length of 15 to 38mm, more preferably 20 to 38mm, from the viewpoint of strength.

The infrared absorber is not particularly limited as long as it has an infrared absorbing effect. Examples thereof include antimony-doped tin oxide, indium tin oxide, niobium-doped tin oxide, phosphorus-doped tin oxide, fluorine-doped tin oxide, antimony-doped tin oxide supported on a titanium oxide substrate, 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 arc resistance, the infrared absorber is preferably a tin oxide-based compound, more preferably at least one selected from antimony-doped tin oxide, indium tin oxide, niobium-doped tin oxide, phosphorus-doped tin oxide, fluorine-doped tin oxide, and antimony-doped tin oxide supported on a titanium oxide substrate, still more preferably at least one selected from antimony-doped tin oxide and antimony-doped tin oxide supported on a titanium oxide substrate, and still more preferably antimony-doped tin oxide supported on a titanium oxide substrate. The infrared absorbing agent may be used alone or in combination of 2 or more.

The arc protection clothing fabric preferably contains the ultraviolet absorber in an amount of 0.15 to 5 wt%, more preferably 0.3 to 3.5 wt%, and further preferably 0.4 to 2.5 wt% based on the total weight of the fabric, from the viewpoint of excellent arc resistance. As the ultraviolet absorber, the same ultraviolet absorbers as those used for the arc-resistant acrylic fibers can be used.

The flame retardant is not particularly limited, but from the viewpoint of improving arc resistance, a phosphorus flame retardant is preferred, and a phosphorus compound such as an N-hydroxymethylphosphonate compound or a tetrahydroxyalkylphosphonium salt is more preferred. The N-hydroxymethylphosphonate compound readily reacts with and binds to the cellulose molecule. Examples of the N-hydroxymethylphosphonate compound include N-hydroxymethyldimethylphosphonocarboxylic acid amide containing N-hydroxymethyldimethylphosphonopropionic acid amide. Tetrahydroxyalkylphosphonium salts tend to form insoluble polymers in cellulosic fibers. Examples of the tetrahydroxyalkylphosphonium salt include tetrahydroxymethylphosphonium chloride (THPC), tetrahydroxymethylphosphonium sulfate (THPS), and the like.

The arc protection clothing fabric preferably contains 5 to 30 wt%, more preferably 10 to 28 wt%, and still more preferably 12 to 24 wt% of the flame retardant based on the total weight of the fabric, from the viewpoint of excellent arc resistance.

The arc protective clothing fabric preferably has an average total reflectance of 55% or less, more preferably 50% or less, still more preferably 45% or less, and still more preferably 40% or less, with respect to incident light having a wavelength of 750 to 2500 nm. When the average total reflectance of incident light having a wavelength of 750 to 2500nm is within the above range, the infrared ray absorption ability is high and the arc resistance is excellent. In addition, the arc protective clothing fabric has a total reflectance of preferably 45% or less, more preferably 40% or less, and even more preferably 35% or less in a wavelength region of 2000nm or more from the viewpoints of high infrared ray absorption ability and excellent arc resistance. In the present invention, the total reflectance of the fabric can be measured on either the front surface or the back surface. The arc protective clothing fabric preferably has a difference in average total reflectance with respect to incident light having a wavelength of 750 to 2500nm of 10% or less, more preferably 5% or less, and even more preferably 0% in total reflectance measurement with the front surface as a measurement surface and total reflectance measurement with the back surface as a measurement surface.

The arc protective clothing fabric may contain aramid fibers from the viewpoint of durability. The aramid fiber can be para-aramid fiber or meta-aramid fiber. The fineness of the aramid fiber is not particularly limited, and is preferably 1 to 20dtex, more preferably 1.5 to 15dtex, from the viewpoint of strength. The fiber length of the aramid fiber is also not particularly limited, and is preferably 38 to 127mm, and more preferably 38 to 76mm, from the viewpoint of strength.

The arc protective clothing fabric preferably contains 5 to 30 wt%, more preferably 10 to 20 wt%, of the aramid fiber, based on the total weight of the fabric. When the content of the aramid fiber in the arc protective clothing fabric is within the above range, the durability of the fabric can be improved.

The fabric for arc protective clothing may further contain other fibers such as plant fibers including cotton and hemp, animal fibers including wool, camel hair, goat wool, and silk, regenerated fibers including viscose rayon and cuprammonium fiber, semi-synthetic fibers including acetate fiber, and synthetic fibers including nylon fiber, polyester fiber, and acrylic fiber, within a range not to impair the effects of the present invention. The other fibers are preferably contained in an amount of 40 wt% or less based on the total weight of the fabric. Among them, plant fibers or regenerated fibers are preferable because of easy carbonization.

The weight per unit area (one ounce) of the fabric for arc protection clothing) is preferably 3 to 10oz/yd²More preferably 4 to 9oz/yd²More preferably 4 to 8oz/yd². When the weight per unit area is within the above range, protective clothing that is light in weight and excellent in handling properties can be provided.

The arc protective clothing fabric has a weight per unit area of 8oz/yd²In the following, the ATPV value measured in accordance with ASTM F1959/F1959M-12(Standard Test Method for Determining the Arc Rating of materials for cloning) is preferably 8cal/cm²The above. Can provide lightweight protective clothing with good arc resistance. ATPV per unit area weight, i.e. specific ATPV (cal/cm)²)/(oz/yd²) Preferably 1.1 or more, more preferably 1.2 or more, and further preferably 1.3 or more.

Examples of the form of the fabric for arc protective clothing include woven fabric, knitted fabric, and nonwoven fabric, but are not limited thereto. In addition, the textile can be warp-knitted, and the knitted fabric can be warp-knitted.

The weave of the woven fabric is not particularly limited, and may be a three-dimensional weave such as a plain weave, a twill weave, and a satin weave, or a pattern woven fabric using a special loom such as a dobby loom or a jacquard loom. The structure of the knitted fabric is not particularly limited, and may be any of circular knitting, flat knitting, and warp knitting. The fabric is preferably a woven fabric, and more preferably a twill woven fabric, from the viewpoint of high tear strength and excellent durability.

The arc protective clothing fabric is not particularly limited, and the thickness is preferably 0.3 to 1.5mm, more preferably 0.4 to 1.3mm, and even more preferably 0.5 to 1.1mm from the viewpoint of strength and comfort of the fabric to be used as a work clothing. The thickness was measured according to JIS L1096 (2010).

The fabric for arc protective clothing can be produced by subjecting a fabric containing a cellulose fiber to flame retardant treatment with a flame retardant, and then attaching an infrared absorber thereto.

When a phosphorus-based compound such as an N-hydroxymethylphosphonate compound or a tetrahydroxyalkylphosphonium salt is used as the flame retardant, the flame-retardant treatment with the phosphorus-based compound is not particularly limited, and for example, from the viewpoint of bonding the phosphorus-based compound to the cellulose molecules of the natural cellulose fibers, the treatment with PYROVATEX is preferably performed. The PYROVATEX processing method can be performed according to a known general procedure described in, for example, PYROVATEX CP technical material of HUNTSMAN corporation.

The flame retardant treatment using the phosphorus-based compound is not particularly limited, and is preferably performed by an ammonia curing method using a tetrahydroxymethylphosphonium salt (hereinafter also referred to as a THP-ammonia curing method), for example, from the viewpoint that the phosphorus-based compound easily forms an insoluble polymer in cellulose fibers. The THP-ammonia curing method can be carried out, for example, in accordance with a known and usual procedure described in Japanese patent publication No. 59-39549.

Next, the cloth containing the natural cellulose fiber subjected to the flame retardant treatment is impregnated with an aqueous dispersion in which an infrared absorbing agent is dispersed, whereby the infrared absorbing agent can be attached to the cloth. In this case, a binder used in fiber processing may be used.

(arc protective clothing)

The arc protective clothing of the present invention can be produced by a known method using the arc protective clothing fabric of the present invention. The arc protective clothing may be used as a single-layer protective clothing using the arc protective clothing fabric, or may be used as a multi-layer protective clothing using the arc protective clothing fabric in 2 or more layers. In the case of a multilayered protective garment, the arc protective garment fabric described above may be used for all layers, or may be used for some layers. When the arc protective clothing fabric is used as a part of the layers of the multilayer protective clothing, it is preferable to use the arc protective clothing fabric as the outer layer.

The arc protection suit of the present invention is excellent in arc resistance and also excellent in flame retardancy and workability. Further, the arc resistance and flame retardancy are maintained even after repeated washing.

The present invention provides a method for using the acrylic fiber as an arc-resistant acrylic fiber. Specifically disclosed is a use of an arc-resistant acrylic fiber, which is composed of an acrylic polymer and contains an infrared absorber in an amount of 1-30 wt% relative to the total weight of the acrylic polymer. Further, a method for using the fabric as a fabric for arc protective clothing is provided. Specifically, the present invention provides a use of the arc protective clothing fabric as an arc protective clothing fabric, wherein the arc protective clothing fabric contains the arc-resistant acrylic fiber, and a content of the infrared absorber is 0.5 wt% or more based on a total weight of the fabric. Also disclosed is a use of the fabric for arc protective clothing, which contains a cellulose fiber, an infrared absorber and a flame retardant, and has an average total reflectance of 50% or less for incident light having a wavelength of 750-2500 nm.