JP2015030934A - Antistatic work clothing with excellent electrostatic performance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fabric with excellent conductive and antistatic performance and work clothing in which the cloth made by sewing up the fabric has conductivity throughout it and which is also provided with excellent durability and antistatic performance.SOLUTION: Antistatic clothing is made by sewing together by sewing threads pieces of fabric including a conductive fiber, the sewing threads containing 0.5-20 mass% of the conductive fiber, the conductive fiber contained in the sewing threads being composed of a conductive layer (a) formed of carbon and a thermoplastic resin (A) and a protective layer (b) formed of a thermoplastic resin (B) and satisfying all of the following conditions (1) to (4): (1) The electric resistance value of a single yarn of the conductive fiber is 1×10-9×10Ω/cm f. (2) The single fiber fineness of the conductive fiber is 1.1-7.5 dtex. (3) The mass ratio between the conductive layer (a) and the protective layer (b) in the conductive fiber is 5:95-30:70. (4) ΦB/D≤0.5. Where, ΦB is the closest distance (μm) between the conductive layer and an external surface of the conductive fiber in the conductive fiber. D is the furthest linear distance (μm) between the center of gravity of the conductive layer and the external surface of the conductive fiber in the conductive fiber.

Description

  The present invention relates to a woven fabric excellent in electrical conductivity and antistatic property, and a garment formed by stitching the woven fabric. Specifically, the present invention relates to an antistatic clothing that is electrically conductive throughout and has excellent durability and antistatic properties.

  Conventionally, in electrical and electronic equipment manufacturing work, electrostatic charging has been a factor that deteriorates the yield of products in order to handle precision equipment such as semiconductor devices. In recent years, general household appliances, automobiles, mobile phones, and the like have also made heavy use of semiconductor devices, and prevention of static electricity has become a major issue in terms of product safety and quality assurance. In the energy supply industry, sparks and sparks due to electrostatic charging can lead to major accidents, so improving the antistatic performance of work clothes and improving the durability of antistatic performance are major issues. Many conductive polyester fabrics using conductive fibers for at least part of the warp and / or weft of the fabric as a countermeasure against static electricity have been proposed and marketed (see, for example, Patent Document 1 and Patent Document 2). If this method is used, it is possible to effectively prevent charging. However, if the arrangement and arrangement of the conductive fibers are not precise, a sufficient effect cannot be expected and the price becomes expensive. Furthermore, when conductive fibers are densely woven into a woven fabric, there are differences in the properties of the original yarn such as strength, elongation, and shrinkage between the conductive yarn and the other yarns that make up the woven fabric. There was a problem that various defects such as cutting and puckering were likely to occur. If the arrangement / arrangement is kept small, the antistatic effect is poor and the antistatic work clothes are not preferable.

JP-A-60-173140 JP 2001-73207 A

  An object of the present invention is to solve the above-described problems. In particular, the fabric has excellent conductivity and antistatic properties, and the entire fabric formed by stitching the fabric has conductivity, and its durability and The object is to provide work clothes with excellent anti-static properties.

  As a result of intensive studies on the above problems, the inventors of the present invention have excellent electrical conductivity and antistatic properties by stitching woven fabrics containing conductive yarns with sewing yarns containing conductive fibers. The inventors have found that an antistatic garment can be obtained and have reached the present invention.

That is, the present invention is an antistatic garment in which fabrics containing conductive fibers are sewn together with a sewing thread, and the sewing thread contains 0.5 to 20% by mass of conductive fibers, and the sewing thread contains The conductive fibers contained are composed of a conductive layer (a) composed of carbon and a thermoplastic resin (A) and a protective layer (b) composed of a thermoplastic resin (B), and the following (1) to (4) Both are satisfying antistatic clothing.
(1) The electric resistance value of the single yarn of the conductive fiber is 1 × 10 ^{5 to} 9 × 10 ¹⁰ Ω / cm · f.
(2) The single yarn fineness of the conductive fiber is 1.1 to 7.5 dtex.
(3) The mass ratio of the conductive layer (a) and the protective layer (b) in the conductive fiber is 5:95 to 30:70.
(4) ΦB / D ≦ 0.5.
ΦB: the closest distance (μm) between the conductive layer and the outer surface of the conductive fiber in the conductive fiber
D: The farthest linear distance (μm) between the center of gravity of the conductive fiber and the outer surface of the conductive fiber

  Preferably, in the antistatic clothing, the armhole portion and / or the side stitch portion are sewn with the sewing thread.

  More preferably, the antistatic garment is characterized in that the woven fabric contains conductive fibers in the warp and / or the weft.

  More preferably, the conductive fiber contained in the woven fabric is composed of a conductive layer (c) and a protective layer (d), and the protective layer (d) of the conductive layer (c) is in the fiber cross section of the conductive fiber. The antistatic garment covering the entire surface.

  The antistatic apparel of the present invention is less likely to be charged even when processed with a commercial dryer such as a tumbler, and even if washing is repeated, the antistatic property and strength are not reduced. It has excellent characteristics and also has excellent wear resistance characteristics.

It is a schematic diagram of one Embodiment regarding the cross section of the conductive fiber contained in the antistatic clothing of this invention. It is a schematic diagram of one Embodiment regarding the cross section of the conductive fiber contained in the antistatic clothing of this invention. It is a schematic diagram of one Embodiment regarding the cross section of the conductive fiber contained in the antistatic clothing of this invention. It is a schematic diagram of one Embodiment regarding the cross section of the conductive fiber contained in the antistatic clothing of this invention. It is a schematic diagram of one Embodiment regarding the cross section of the conductive fiber contained in the antistatic clothing of this invention. It is a mimetic diagram as one embodiment about work clothes (outerwear) which is the antistatic clothing of the present invention. It is the schematic diagram as one Embodiment regarding the work pants which are the antistatic clothing of this invention.

  The antistatic garment of the present invention is an antistatic garment in which fabrics containing conductive fibers are stitched together with a sewing thread, and the conductive fiber is contained in the sewing thread. First, details of the sewing thread will be described below.

(Sewing thread)
The sewing thread of the present invention is composed of conductive fibers and non-conductive fibers made of synthetic fibers or natural fibers. About the ratio of the conductive fiber in the sewing thread, 0.5 to 20% by mass is contained from the point of imparting conductivity to the sewing thread stably over a long period of time and having excellent wear resistance. is important. If the conductive fiber content is less than 0.5% by mass, it will be difficult to stably provide the sewing part with long-term conductivity. If it exceeds 20% by mass, the resistance of the sewing thread or antistatic clothing will be reduced. It will lack wear and aesthetics. Preferably it is 0.8-15 mass%, More preferably, it is 1.0-10 mass%.

  The structure of the sewing thread is not limited as long as the utility of the present invention is achieved, but the structure is such that a conductive fiber is covered with a non-conductive fiber made of a synthetic fiber or a natural fiber, or a synthetic fiber or a natural fiber. A structure in which a non-conductive fiber and a conductive fiber are twisted together is preferably used because it is easy to produce a sewing thread and the conductive characteristics of the obtained sewing thread are good. As described above, by using the mixed yarn / spun conductive yarn as a sewing thread, sufficient conductivity can be obtained, and the antistatic clothing using the sewing thread is repeatedly worn and washed, and the stitched portion using the sewing yarn is used. Even when puckering occurs, a stitched portion having excellent durability can be formed.

(Conductive fiber contained in sewing thread)
The conductive fibers contained in the sewing thread of the present invention include a conductive layer (hereinafter referred to as a conductive layer (a)) composed of carbon and a thermoplastic resin (A) and a protective layer (hereinafter referred to as a conductive layer (B)). And a protective layer (referred to as (b)). This is because if the conductive layer containing carbon is made into a fiber alone, the spinnability and stretchability are poor even if the thermoplastic resin (A) as a matrix has sufficient fiber-forming properties. Yes, this is because it is difficult to make the conductive layer alone. Therefore, it is important that the conductive fiber is composed of the conductive layer (a) and the protective layer (b), and the mass ratio of the conductive layer (a) and the protective layer (b) in the conductive fiber is Being between 5:95 and 30:70 is important in that it is easy to make conductive fibers and maintain physical properties. If the mass ratio of the conductive layer (a) exceeds 30, the spinnability at the time of spinning the conductive fiber tends to decrease, and spun yarn and stretched yarn frequently occur. On the other hand, if the mass ratio of the conductive layer (a) is less than 5, problems occur in terms of continuity in the fiber length direction of the conductive layer (a) and exposure to the surface of the conductive fiber, and further sufficient conductivity is exhibited. Difficult to do. The mass ratio is preferably 15:85 to 30:70, and more preferably 18:82 to 25:75.

  The melting point of the resin constituting the conductive layer (a) is preferably 200 ° C. or more from the viewpoint of practical durability. More preferably, it is 210 degreeC or more and 250 degrees C or less.

As carbon in the conductive layer (a), known carbon such as conductive carbon black can be used, and other examples include acetylene black, oil furnace black, thermal black, channel black, ketjen black and the like. . Among these, conductive carbon black is preferably used, and in particular, conductive carbon black having a specific electric resistance of 10 ⁻³ to 10 ³ Ω · cm is preferably used from the viewpoint of securing the conductivity of the sewing thread. The carbon content in the conductive layer (a) is 23 to 40% by mass, preferably 25 to 35% by mass. When the content of the conductive carbon black is less than 23% by mass, the conductivity as intended by the present invention cannot be obtained, and the sufficient static elimination performance is not exhibited, which is not preferable. On the other hand, if it exceeds 40% by mass, further improvement in conductivity is not recognized, but rather the fluidity of the polymer is drastically lowered and the spinnability is extremely deteriorated.

The thermoplastic resin (A) in the conductive layer (a) is preferably a thermoplastic polyester or a thermoplastic polyamide from the viewpoint of spinning stability and wear resistance of the conductive fiber.
Examples of the thermoplastic polyester include terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, 4,4′-dicarboxydiphenyl, 5-sodium sulfoisophthalic acid and other aromatic dicarboxylic acids, azelaic acid, and sebacic acid. Dicarboxylic acid components such as aliphatic dicarboxylic acids such as ethylene glycol, diethylene glycol, propylene glycol; aromatic diols such as ethylene oxide adducts of bisphenol A or bisphenol S; diol components such as alicyclic diols such as cyclohexanedimethanol Examples thereof include a fiber-forming polyester formed by using a polybutylene terephthalate resin. In particular, in the design of antistatic clothing, when it is desired to increase the carbon content in the conductive layer (a) and increase the conductivity of the conductive fiber, a polybutylene terephthalate resin is preferably used. When it is desired to improve the fastness to washing, a polyethylene terephthalate resin is preferably used.
Examples of the thermoplastic polyamide include nylon 12, nylon 11, nylon 6, nylon 66, nylon elastomer, and the like.

  The protective layer (b) plays an important role in maintaining long-term durability performance without causing interfacial peeling from the conductive layer (a) and maintaining good processability during the fiberization of the present invention. I'm in charge. As the thermoplastic resin (B) constituting the protective layer (b), thermoplastic polyester or thermoplastic polyamide capable of forming fibers can be used. A polymer inferior in spinnability is basically unsuitable as the protective layer resin of the present invention.

As the thermoplastic polyester in the protective layer (b), for example, terephthalic acid, isophthalic acid, naphthalene-2 are preferable because they have good melt viscosity characteristics when fiberized, and excellent fiber properties and heat resistance. , 6-dicarboxylic acid, 4,4'-dicarboxydiphenyl, 5-sodium sulfoisophthalic acid and other aromatic dicarboxylic acids; azelaic acid, sebacic acid and other aliphatic dicarboxylic acid components, ethylene glycol, diethylene glycol , Propylene glycol, 1,4-butanediol, polyethylene glycol, polytetramethylene glycol and other aliphatic diols; bisphenol A or bisphenol S ethylene oxide adducts and the like; cyclohexanedimethanol and other alicyclics Diol components such as diol Mention may be made of fiber-forming polyesters formed by using them.
Among them, polyesters containing 80 mol% or more, preferably 90 mol% or more of ethylene terephthalate units and butylene terephthalate units which are general-purpose polyesters can be mentioned, and modified polyesters containing a small amount of a third component can also be used. It is. In particular, polyethylene terephthalate-based polyester is preferable in terms of fiberizing process properties, fiber properties, and durability.

Further, as the thermoplastic polyamide in the protective layer (b), nylon 12 and nylon 11 are specifically mentioned from the viewpoint of good melt viscosity characteristics at the time of fiberizing and further excellent fiber physical properties and heat resistance. , Nylon 6, nylon 66, nylon elastomer and the like. Further, these may contain a small amount of additives, fluorescent whitening agents, stabilizers and the like.
Among these, nylon 6 and nylon 12 are preferable in terms of achieving both fiberization process properties and fiber physical properties such as durability, and being excellent in economic efficiency.

  In this invention, arrangement | positioning of the conductive layer (a) in the fiber cross section of the conductive fiber contained in a sewing thread is important. That is, between the linear distance ΦB that is closest between the conductive layer (a) and the outer surface of the conductive fiber, and the linear distance D that is most remote between the center of gravity in the fiber cross section and the outer surface of the conductive fiber, It is important that a relationship of ΦB / D ≦ 0.5 exists. By satisfying the above relationship, it becomes possible to secure sufficient conductivity of the sewing thread and to reduce the charge amount of the antistatic clothing of the present invention. In addition, when there are a plurality of conductive layers (a) in the fiber cross section, the linear distance closest to the conductive layer and the outer surface of the conductive fiber among the plurality of conductive layers (a) is ΦB. To do.

The electric resistance value of the single yarn of the conductive fiber contained in the sewing thread of the present invention is in the range of 1 × 10 ^{5 to} 9 × 10 ¹⁰ Ω / cm · f. This is important in achieving both the properties and securing the conductivity when used as a sewing thread. The range of 1 × 10 ⁵ to 1 × 10 ⁹ Ω / cm · f is more preferable to ensure the stability of the charge electrification amount of the antistatic clothing, and 1 × 10 ⁵ to 1 × 10 ⁸ Ω / cm. -More preferably, it is in the range of f.

  The fineness of the single yarn of the conductive fiber is 1.1 to 7.5 dtex, and the spinnability of the conductive fiber and the sewing thread made of the obtained conductive fiber satisfy both strength and conductivity. It is important in that it becomes easy.

  The conductive fiber may be a long fiber or a short fiber, but a short fiber is preferable in view of cost merit due to performance, durability, and low mixing ratio.

(Non-conductive fiber contained in sewing thread)
The non-conductive fibers contained in the sewing thread of the present invention together with the conductive fibers are natural fibers, even if they are synthetic fibers, as long as they do not fray or loosen during production and have sufficient strength as a sewing thread. There may be. Among them, polyester fibers and polyamide fibers are preferably used for synthetic fibers, and cotton fibers and wool fibers are preferably used for natural fibers because they have moderately hygroscopic properties and are economically superior.

  The length of the non-conductive fiber may be either a short fiber or a long fiber as long as strength characteristics and abrasion resistance as a sewing thread are sufficient. It is preferable from the viewpoint of the quality stability that it is the same as the fiber. In particular, considering that the production of the sewing thread with a general-purpose device is easy, it is preferable that the fibers constituting the sewing thread are short fibers, both of the conductive fibers and the other fibers.

  The woven fabric constituting the antistatic clothing of the present invention is characterized by containing conductive fibers. Hereinafter, the details of the fabric will be described.

(fabric)
The structure of the woven fabric of the present invention is not particularly limited, and considering the strength characteristics of the antistatic clothing, it preferably has a woven fabric structure such as plain weave, twill weave, satin weave. In particular, considering that the yarn containing conductive fibers is regularly and uniformly exposed on the surface of the fabric, the fabric structure is preferably a plain weave.

  The woven fabric is composed of conductive yarn made of conductive fibers and non-conductive fibers, and non-conductive yarn made only of non-conductive fibers. The proportion of the conductive yarn in the woven fabric is such that the non-conductive yarn containing no conductive fiber is 100 parts by weight and the conductive yarn is 0.5 to 20 parts by weight in each part of the antistatic clothing. It is preferable for achieving both uniformity of charging characteristics, uniformity of color tone at each part, and aesthetics.

  Moreover, it is preferable that the said woven fabric contains a conductive fiber in the warp and / or the weft which comprise a textile fabric part. That is, it is preferable that conductive yarn is mixed in the warp and / or the weft, and the mixing pitch of the conductive yarn is preferably 1/3 cm or more, more preferably 1/1 cm or more in the warp direction. The weft direction is preferably 1/5 cm or more, more preferably 1 / 2.5 cm or more.

(Non-conductive yarn constituting woven fabric)
The fibers used for the non-conductive yarn constituting the woven fabric of the present invention are polyesters represented by polyethylene terephthalate and polybutylene terephthalate, taking into consideration the strength characteristics including the durability of antistatic garments, handleability, and economy. A fiber, a polyamide fiber represented by nylon 6, nylon 66, or the like is preferably used.

  The length of the fiber used for the non-conductive yarn may be either a long fiber or a short fiber, but in consideration of the production process of the fabric and the occurrence of fluff of the resulting fabric, the warp direction of the fabric The non-conductive yarn and the non-conductive yarn in the weft direction are preferably made of long fibers.

(Conductive yarn constituting the fabric)
The conductive yarn constituting the woven fabric of the present invention preferably has a structure in which long non-conductive fibers are covered with conductive fibers. More preferably, the conductive yarn used for the warp and / or the weft has a double covering structure in which the non-conductive fiber of the core long fiber is covered with the conductive fiber, or used for the warp and / or the weft. One of the conductive yarns is a double-covering structure in which the non-conductive fibers of the long fibers serving as the core are covered with the conductive fibers, and the non-conductive fibers of the long fibers serving as the core are the conductive composite fibers. A covered single covering structure or a double covering structure in which a non-conductive fiber of a long fiber, which is one of the cores of the conductive yarn used for warp and / or weft, is covered with a conductive fiber, The other has a structure in which long-fiber non-conductive fibers and conductive fibers are twisted together.

In the conductive yarn having the double covering structure, the conductive fiber coverage indicating the proportion of the conductive fiber is the proportion of the conductive yarn when the conductive yarn is viewed from the side, and is represented by the following formula.
Conductive fiber coverage (%) = (area of conductive fiber) / (area of conductive yarn) × 100
The conductive fiber coverage is preferably as high as possible, but the conductive fiber coverage is preferably 20 to 70% in view of processability, weaving property, cost, conductivity and the like of the conductive yarn. If it is less than 20%, it is difficult to obtain a conduction effect. Further, if it exceeds 70%, sufficient conduction can be obtained, but even if mixed more than that, the effect of improving the conductivity is small, which is disadvantageous in terms of cost, and the problem of poor wear resistance occurs.

  The long non-conductive fibers used for the conductive yarn may be essentially the same as those constituting the base of the woven fabric for clothes. Specific examples of the material include polyester (polyethylene terephthalate, etc.) and polyamide (nylon 6, nylon 66, etc.). Polyester is most preferable from the viewpoint of chemical resistance and handling properties.

(Conductive fiber contained in the conductive yarn of the fabric)
The conductive fiber contained in the conductive yarn constituting the fabric of the present invention is substantially composed of a conductive layer (hereinafter referred to as a conductive layer (c)) composed of carbon-containing thermoplastic polyester or thermoplastic polyamide and carbon. It consists of a protective layer (hereinafter referred to as protective layer (d)) made of a fiber-forming polymer not contained. Preferably, the conductive layer (c) forms the core component of the fiber and the protective layer (d) forms the sheath component, so that the protective layer (d) is the conductive layer (c) in the fiber cross section of the conductive fiber. ) Is a conductive fiber covering the entire surface.

  About carbon content contained in a conductive layer (c), it is 23-40 mass%, Preferably it is 25-35 mass%. When the carbon content is less than 23% by mass, the conductivity as intended by the present invention cannot be obtained, and sufficient static elimination performance cannot be exhibited. On the other hand, when it exceeds 40% by mass, further improvement in conductivity is not recognized, but rather the fluidity of the polymer is drastically lowered and the spinnability is extremely deteriorated.

  Further, when the polymer constituting the conductive layer (c) is a thermoplastic polyester, there is almost no conductivity when the carbon content is less than 20% by mass, and when 23% by mass, the conductivity is rapidly improved, When it exceeds 25% by mass, it is almost saturated. In the case of a thermoplastic polyamide, if the carbon content is less than 25% by mass, there is almost no effect, and if it is 30% by mass, it will improve rapidly, and if it exceeds 35% by mass, it will be almost saturated.

As the carbon in the conductive layer (c), well-known materials such as conductive carbon black can be used in the same manner as the sewing thread, and acetylene black, oil furnace black, thermal black, channel black, ketjen black are also available. Etc. are exemplified. Among these, conductive carbon black is preferably used, and one having a specific electric resistance of 10 ⁻³ to 10 ³ Ω · cm is more preferable. When carbon black is completely dispersed in particles, the conductivity is generally poor, and when a chain structure called a structure is formed, the conductivity is improved and the carbon black is called conductive carbon black. Become something. Therefore, when imparting conductivity to a polymer using conductive carbon black as carbon, it is important to disperse the conductive carbon black without destroying the structure.

  In general, since the structure is easily broken when the normal drawing is performed, in the present invention, as a drawing method having the feature that the structure is hardly broken despite being drawn, Japanese Patent No. 4902652 (paragraph 0042). And 0057) is used. That is, since the normal stretching method is a method of forcibly stretching due to the speed difference between the rollers, the fiber is forcibly stretched and the structure is cut. In the present invention, the fiber is not a method of stretching between the rollers. Since the method of entrusting to free stretching is used, excessive tension is not applied to the fiber, so that the structure is difficult to be cut.

  And as an electric conduction mechanism of the conductive carbon black-containing composite, there are a carbon black chain contact and a tunnel effect, and the former is considered to be the main. Therefore, when the carbon black chain is long or has a high density and the carbon black is present in the polymer, the contact probability increases and the conductivity becomes high. In order to lengthen the chain, the polymer constituting the conductive layer (c) is crystallized, and the amorphous structure is loosely structured to allow molecular motion, so that carbon black concentrates on the amorphous part. The carbon concentration in the amorphous part increases, and the conductive performance increases.

  In the present invention, since the above-described special spinning / drawing method is used, the conductive layer (c) is crystallized and the amorphous portion is capable of molecular motion as compared with the conductive fiber subjected to the normal drawing treatment. Therefore, it is extremely excellent as a conductive fiber. The conductive fiber obtained by the special spinning drawing method of the present invention is different from the conductive fiber obtained by using the conventional general drawing method (including the direct spinning drawing method) or the non-drawing conductive fiber. Regarding (DT) and elongation (DE), the following conditions are satisfied: 1.8 ≦ DT (cN / dtex) ≦ 4.5 and 30 ≦ DE (%) ≦ 90.

  Examples of the thermoplastic polyester used in the conductive layer (c) include fragrances such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, 4,4′-dicarboxydiphenyl, and 5-sodium sulfoisophthalic acid. Dicarboxylic acid components such as azelaic acid and sebacic acid, and aliphatic diols such as ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, polyethylene glycol, and polytetramethylene glycol; Aromatic diols such as ethylene oxide adducts of bisphenol A or bisphenol S; fiber-forming polyesters formed using diol components such as alicyclic diols such as cyclohexanedimethanol, and polybutylene terephthalate Rate-based resins can be mentioned. Moreover, it is necessary from the point of practical durability that melting | fusing point of resin which comprises a conductive layer is 200 degreeC or more. Preferably it is 210 degreeC or more and 250 degrees C or less.

  Examples of the thermoplastic polyamide used for the conductive layer (c) include nylon 12, nylon 11, nylon 6, nylon 66, and nylon elastomer.

  The ratio of the mass of the conductive layer (c) is preferably 15 to 30% by mass with respect to the mass of the fiber. Resin with a high concentration of carbon is protected because the spinnability and stretchability are poor even if the matrix resin has sufficient fiber-forming properties, and it is difficult to fiberize alone. Maintaining the fiber forming process and fiber properties by combining with the layer polymer. However, when the conductive layer (c) of the sheath component containing carbon exceeds 50% by mass of the fiber mass, the spinnability at the time of spinning tends to be lowered, and the spun yarn and the stretched yarn frequently occur. Therefore, it is preferable that the protective layer (d) of the core component occupies 50% by mass or more of the fiber mass, and more preferably 70% by mass or more. However, if the amount of the conductive layer (c) is too small, a problem arises in terms of the continuity of the conductive layer (c) and the exposure to the fiber surface. Therefore, the proportion of the conductive layer (c) is preferably 15% by mass or more. More preferably, it is 18-25 mass%.

  The protective layer (d) plays an important role in maintaining long-term durability performance while maintaining good processability and without causing interface peeling with the conductive layer (c) during fiberization of the present invention. I'm in charge. As the polymer constituting the protective layer (d), thermoplastic polyester and thermoplastic polyamide capable of forming fibers can be used. A polymer inferior in spinnability is basically unsuitable as the protective layer resin of the present invention.

  Examples of the thermoplastic polyester used in the protective layer (d) include fragrances such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, 4,4′-dicarboxydiphenyl, and 5-sodium sulfoisophthalic acid. Dicarboxylic acid components such as azelaic acid and sebacic acid, and aliphatic diols such as ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, polyethylene glycol, and polytetramethylene glycol; Examples thereof include an aromatic diol such as an ethylene oxide adduct of bisphenol A or bisphenol S; and a fiber-forming polyester formed using a diol component such as an alicyclic diol such as cyclohexanedimethanol. Among these, polyesters containing ethylene terephthalate units and butylene terephthalate units, which are general-purpose polyesters, are 80 mol% or more, preferably 90 mol% or more, and modified polyesters containing a small amount of a third component can also be used. is there.

  Specific examples of the thermoplastic polyamide used for the protective layer (d) include nylon 12, nylon 11, nylon 6, nylon 66, and nylon elastomer. Further, these may contain a small amount of additives, fluorescent whitening agents, stabilizers and the like.

  As the thermoplastic polyester and the thermoplastic polyamide, those having good melt viscosity characteristics when fiberized and further excellent in fiber physical properties and heat resistance are preferably employed. Among these, nylon 6 is preferable in terms of fiberizing process properties, fiber properties, and durability in the case of polyethylene terephthalate polyester and polyamide.

  The cross-sectional form of the conductive fiber used for the conductive yarn constituting the fabric of the present invention can be in any form as long as the charged amount of the antistatic clothing of the present invention satisfies a desired value. When importance is attached to the property and wear resistance, the protective layer preferably covers the entire surface of the conductive layer. A typical cross-sectional form of the conductive fiber is shown in FIGS.

  As the fineness of the conductive fiber, for example, a single yarn fineness of 1 to 22 dtex, a total fineness of 10 to 220 dtex, preferably 10 to 110 dtex is used. By making the fineness of the conductive yarn containing the conductive fiber the same as that of the non-conductive yarn constituting the woven fabric, the conductive yarn does not protrude from the woven fabric and the wear durability can be improved. it can.

The resistance value of the conductive fiber is usually 1 × 10 ⁹ Ω / cm · f or less, preferably 1 × 10 ⁸ Ω / cm · f, in order to ensure the stability of the electrification amount of the antistatic clothing. f or less.

(Antistatic clothing)
The antistatic apparel of the present invention is characterized in that the fabrics are sewn together by the sewing thread, and among the parts to be sewn in the antistatic apparel, the armhole part and / or the side stitch part contain conductive fibers. Sewing with a sewing thread is preferably employed in the sense of reducing the charge amount of the antistatic clothing. Thus, it can be confirmed that sufficient performance stabilization can be realized by measuring the charge amount by the tumbler method (JIS standard T-8118). Moreover, even if wearing, washing, etc. are repeated and puckering occurs in the stitched portion, it is preferable from the viewpoint that stable performance and durability can be secured via the sewing thread.

  About the armhole part and the side stitching part, it is preferable that 10% or more of the part length of the whole antistatic clothing is sewn with a sewing thread made of conductive fibers, and 50% or more of the part length is made of conductive fibers. More preferably, 80% or more of the part length is stitched with a sewing thread made of conductive fibers. Regarding the sewing of the arm home portion, a sewing thread made of conductive fibers may be continuous around the arm home portion.

  Examples of the present invention will be described below. The evaluation method is as follows.

[Charged charge of work clothes]
Evaluation was performed by a tumbler method defined in JIS standard T-8118 (including washing 50HL).

[Fiber cross-sectional form]
In the conductive fiber contained in the sewing thread, any 10 fiber cross sections are selected from the electron micrograph of the fiber cross section (magnification: 2000 times), and the most between the conductive layer and the conductive fiber outer surface of the conductive fiber. The average value of the close distance (ΦB; μm) and the most distant linear distance (D; μm) between the center of gravity of the conductive fiber and the outer surface of the conductive fiber was determined.

<Reference example>
A reference example is a polyester (polyethylene terephthalate; hereinafter abbreviated as PET) false twisted yarn 167T-48f (warp density: 90 yarns / in) as a warp forming a woven fabric, and a PET false twist as a weft The processed yarn 167T-48f // 2 (weft density: 76 yarns / in) is used, and as the conductive yarn of the warp part, the PET long fiber yarn 84T-36f and the conductive fiber “Kurabo Kc-300” (Kuraray Co., Ltd.) are used. Manufactured, electrical resistance value: 4 × 10 ⁷ Ω / cm · f) 28T-2f is obtained by twisting ZT twist at 600 T / m and inserting the conductive yarn at a rate of 1 / in. A woven fabric was created. Using cotton short fibers as the sewing thread, two spun yarns of cotton count No. 60 are combined to create a reference sewing thread, and the plain fabric is sutured at all points with the reference sewing thread. (Chaku) was created.
The evaluation results by the tumbler method are shown in Table 1. The work clothes sewn with the control sewing thread have a charge amount of 0.57 μC / point, and work clothes having a value close to the upper limit of those satisfying the standard (charge amount: 0.60 μC / point or less) by the tumbler method evaluation; became.

<Example 1>
In Example 1, the same plain fabric as in the reference example was used. On the other hand, as for the sewing thread, the short cotton fiber described in the reference example and the conductive fiber “Kurabo Kc-585” (manufactured by Kuraray Co., Ltd., electrical resistance: 3 × 10 ⁸ Ω / cm · f, conductive layer and protection) The mass ratio of the layers = 13: 87, single yarn fineness: 3.3T, ΦB / D = 0, fiber cross section: FIG. 1) short fibers so that the conductive fibers are contained in a proportion of 5% by mass. Sliver is mixed to obtain a conductive spun yarn with a twist number of S1020 T / m and a cotton count of 60, and this is combined with two Z860T / m and set at 95 ° C to create a sewing thread. did. The plain woven fabric was sewn at all points with sewing threads to prepare M-size antistatic work clothes (outerwear).
The evaluation results by the tumbler method are shown in Table 1. The charged charge amount of the work clothes sewn with the sewing thread is 0.49 μC / point, satisfies the standard by the tumbler method evaluation (charge charge amount: 0.60 μC / point or less), and compared with the work clothes of the reference example. Work clothes with better antistatic performance were obtained.

<Example 2>
Example 2 is the same as in Example 1 except that the sewing thread used for the stitched parts other than the armhole part and the side stitching part is changed to the reference sewing thread of the reference example. )created. The evaluation results are shown in Table 1. The charged charge amount was 0.51 μC / point, and work clothes having excellent antistatic performance were obtained.

<Example 3>
In Example 3, the conductive fiber used for the sewing thread is a four-core embedded type “Kurabo Kc-485” (manufactured by Kuraray Co., Ltd., electric resistance value: 5 × 10 ⁷ Ω / cm · f, single yarn fineness: 4.4T). Antistatic work clothes under the same conditions as in Example 2 except that the ratio of the conductive layer to the protective layer was changed to short fibers of 13:87, ΦB / D = 0.17, and fiber cross section: FIG. (Outerwear) was created. The evaluation results are shown in Table 1. The charge amount was 0.50 μC / point, and work clothes having excellent antistatic performance were obtained.

<Example 4>
Example 4 has the same conditions as in Example 1 except that the antistatic clothing is changed to LL size antistatic work trousers that are sewn on the side stitches and other parts using the same sewing thread as in Example 3. It carried out in. The evaluation results are shown in Table 1. The charged charge amount was 0.48 μC / point, and work pants having excellent antistatic performance were obtained.

<Example 5>
Example 5 was the same as Example 1 except that the ratio of the conductive fibers contained in the sewing thread was changed to 10% by mass and the size of the antistatic work clothes (outerwear) was changed to EL. It carried out in. The evaluation results are shown in Table 1. The charge amount was 0.55 μC / point, and work clothes having excellent antistatic performance were obtained.

<Example 6>
In Example 6, the conductive fiber used for the sewing thread is a 4-core embedded type “Kurabo Kc-484” (manufactured by Kuraray Co., Ltd., electrical resistance value: 5 × 10 ⁷ Ω / cm · f, single yarn fineness: 4.4T). The antistatic work clothes under the same conditions as in Example 5 except that the length ratio of the conductive layer to the protective layer was changed to a long fiber of 13:87, ΦB / D = 0.17, fiber cross section: FIG. (Outerwear) was created. The evaluation results are shown in Table 1. The charge amount was 0.55 μC / point, and work clothes having excellent antistatic performance were obtained.

<Comparative Example 1>
In Comparative Example 1, a PET false twisted yarn 167T-48f (warp density: 90 yarns / in) was used as a warp forming a woven fabric portion, and a PET false twisted yarn 167T-48f / 2 (weft density: A plain woven fabric containing no conductive fibers and conductive yarns was prepared using 76 pieces / in). As a sewing thread, the control sewing thread described in the reference example was used to sew all the parts, and an M-size work clothes (outerwear) in which no conductive fibers were contained in the woven fabric and the sewing thread were prepared. The evaluation results by the tumbler method are shown in Table 2. The charged charge amount was 1.14 μC / point, which did not satisfy the standard (charge amount: 0.60 μC / point or less) based on the tumbler method evaluation, and the work clothes were inferior in antistatic performance.

<Comparative example 2>
In Comparative Example 2, work clothes (outerwear) were created under the same conditions as in Example 5 except that the sewing thread was changed to the reference sewing thread described in the Reference Example. The evaluation results are shown in Table 2. The amount of charged electric charge was 0.61 μC / point, which did not satisfy the above standard, and the work clothes were inferior in antistatic performance.

<Comparative Example 3>
In Comparative Example 3, the conductive fiber used for the sewing thread was a concentric type (manufactured by Kuraray Co., Ltd., electric resistance value: 5 × 10 ⁸ Ω / cm · f, single yarn fineness: 3.3 T, ΦB / D = 0.65. , Fiber cross section: Work clothes (outerwear) were created under the same conditions as in Example 1 except that the fiber was changed to the short fiber of FIG. The charged charge amount was 0.59 μC / point, which was close to the upper limit of those satisfying the above-mentioned standards, and the antistatic performance was slightly inferior to the working examples.

<Comparative Example 4>
Comparative Example 4 was carried out under the same conditions as in Example 2 except that the mass ratio of the conductive layer and the protective layer in the conductive fiber used for the sewing thread was changed to 40:60. Many yarns were produced, and mass productivity was not obtained.

<Comparative Example 5>
In Comparative Example 5, work clothes (outerwear) were created under the same conditions as in Example 2 except that the mass ratio of the conductive layer and the protective layer in the conductive fibers used for the sewing thread was changed to 2:98. Unlike the comparative example 4, although the yarn forming processability was good, the charged charge amount was 0.62 μC / point, which did not satisfy the standard, and the work clothes were inferior in antistatic performance.

<Comparative Example 6>
Comparative Example 6 was the same as Comparative Example 1 except that the sewing thread was changed to a sewing thread containing conductive fibers described in Example 1, and the size of the antistatic work clothes (outerwear) was changed to EL. The work clothes (outerwear) in which the conductive fiber is not contained in the woven fabric and contained only in the sewing thread were prepared. The charge amount was 0.80 μC / point, which did not satisfy the standard, and the work clothes were inferior in antistatic performance.

<Comparative Example 7>
In Comparative Example 7, LL size work pants were created under the same conditions as in Example 4 except that the sewing thread was changed to the reference sewing thread described in the Reference Example. The charge amount was 0.60 μC / point, which was the upper limit value of the above standard, and the work performance was slightly inferior to that of the example in terms of antistatic performance.

  The antistatic apparel of the present invention provides work clothes that have excellent conductivity and antistatic properties in electrical and electronic equipment manufacturing work and energy supply industry.

1. 1. Conductive layer constituting conductive fiber 2. Protective layer constituting conductive fiber 3. Center of gravity of the cross section of the conductive fiber The closest distance (ΦB) between the conductive layer and the outer surface of the conductive fiber
5. The furthest linear distance (D) between the center of gravity and the outer surface in the fiber cross section of the conductive fiber
6). 6. Armhole part in work clothes (outerwear) Side stitches in work clothes (outerwear) 8. Side stitching in work pants

Claims (4)

An antistatic garment formed by stitching woven fabrics containing conductive fibers with a sewing thread, the sewing thread containing 0.5 to 20% by mass of conductive fibers,
The conductive fibers contained in the sewing thread are composed of a conductive layer (a) composed of carbon and a thermoplastic resin (A) and a protective layer (b) composed of a thermoplastic resin (B). Antistatic clothing satisfying all of (4).
(1) The electric resistance value of the single yarn of the conductive fiber is 1 × 10 ^{5 to} 9 × 10 ¹⁰ Ω / cm · f.
(2) The single yarn fineness of the conductive fiber is 1.1 to 7.5 dtex.
(3) The mass ratio of the conductive layer (a) and the protective layer (b) in the conductive fiber is 5:95 to 30:70.
(4) ΦB / D ≦ 0.5.
ΦB: the closest distance (μm) between the conductive layer and the outer surface of the conductive fiber in the conductive fiber
D: The farthest linear distance (μm) between the center of gravity of the conductive fiber and the outer surface of the conductive fiber   The antistatic clothing according to claim 1, wherein the armhole portion and / or the side stitch portion are stitched by the sewing thread.   3. The antistatic clothing according to claim 1, wherein the woven fabric contains conductive fibers in warp and / or weft.   The conductive fiber contained in the woven fabric is composed of a conductive layer (c) and a protective layer (d), and the protective layer (d) covers the entire surface of the conductive layer (c) in the fiber cross section of the conductive fiber. The antistatic clothing according to any one of claims 1 to 3.

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