JP6487228B2 - Flame retardant antistatic fabric and clothes - Google Patents

Description

  The present invention relates to a fabric using conductive fibers that has both flame retardancy and antistatic properties.

Conventionally, many antistatic fabrics suitable for work clothes worn at the site where electronic parts and precision parts are handled have been proposed. As such a fabric, for example, one in which conductive threads are arranged at intervals in the fabric and the surface resistance value between two points across the stitches is defined within a predetermined range has been proposed (for example, Patent Document 1). reference). The antistatic fabric has required characteristics defined by international standards, and the surface resistance value according to IEC 61340-5-1, 5-2 is preferably 10 ¹² Ω or less.

  In recent years, with the progress of industry, the use of antistatic fabric has greatly expanded, and there is a significant tendency for antistatic fabric to be used not only at the manufacturing site of electronic and precision parts, but also at all sites where static electricity becomes an obstacle. For example, at sites where a lot of dust is present, such as steel manufacturing sites and fire sites (firefighting activity sites), antistatic fabrics are frequently used from the viewpoint of ensuring safety, and accordingly flame retardancy and flameproofness tend to be required.

  Under such circumstances, several fabrics have been proposed as fabrics having both anti-flameability and flameproofing properties. For example, Patent Document 2 discloses a woven fabric in which a flame-retardant polyester fiber composite yarn is used as a ground yarn and conductive composite yarns are arranged in a grid pattern on the fabric, and Patent Document 3 discloses a metal-plated polyester fiber fabric. A fabric in which a flame retardant is applied to the surface of the fabric is disclosed.

JP 2010-47847 A JP 2006-28655 A JP 2004-2111247 A

  The woven fabric described in Patent Document 2 is excellent in tear strength, chemical resistance, and the like, and is more considered for safety as a flame retardant antistatic fabric. However, in this woven fabric, a twisted polyester yarn and conductive fiber are used as the conductive composite yarn, so that the exposed amount of the conductive fiber on the surface of the composite yarn is small, and the conductive at the contact points in the lattice arrangement. There is a problem that sufficient electrical conductivity between fibers cannot be secured. For this reason, there exists a subject that said IEC standard cannot be achieved. In this case, it is possible to reduce the surface resistance of the fabric to some extent if the mixing ratio of the conductive fibers is increased. However, if the conductive fibers are increased more than necessary, the strength is lowered and the safety is impaired. It is also disadvantageous in terms of cost and appearance.

  In addition, the woven fabric described in Patent Document 3 has an advantage that it can be suitably used as a general material because it has excellent flame retardancy and is excellent in electromagnetic shielding properties. However, in the same fabric, the entire fiber fabric is metal-plated for imparting antistatic properties, and furthermore, a flame retardant is imparted via a hot-melt resin adhesive coated on the entire surface. There is a problem that basic characteristics required for clothes such as appropriate breathability cannot be obtained.

  In view of the above, flame retardant and anti-static fabrics that are excellent in anti-static properties as well as flame retardant and flame proof properties, and suitable for general uniform clothes worn in the field where static electricity suppression is required for safety have been proposed. The fact is not.

  The present invention eliminates the above-mentioned drawbacks of the prior art, and is excellent in anti-static properties as well as flame retardancy and flame resistance, and is used not only in the manufacturing site of electronic parts and precision parts, but also in pharmaceuticals and food processing sites. Another object of the present invention is to provide a flame-retardant and anti-static fabric that can be used safely and comfortably in general sites where static electricity is an obstacle, such as steel manufacturing sites and fire sites.

  The present inventor has intensively studied to obtain a safe and comfortable fabric that has basic characteristics as a uniform garment, as well as antistatic properties, flame retardancy, and flame resistance. As a result, if an appropriate fiber material is selected and then the fiber is arranged in a specific manner in the fabric, it will be possible to exhibit other desired characteristics while embodying the basic characteristics of clothing. I came up with an idea. In other words, it came to the idea that other desired characteristics could be exhibited without sacrificing the basic characteristics as a uniform garment. Therefore, based on this point, we first examined the conductive composite yarn, and in addition to arranging the conductive fiber outside the composite yarn, if the conductive composite yarn is thicker than the ground yarn, the contact between the conductive fibers is sufficient. As a result, the present inventors have found that excellent antistatic properties are exhibited as a whole fabric. Furthermore, if the flame retardant fiber is applied not only to the ground yarn but also to the core yarn of the composite fabric, various properties relating to safety such as flame retardancy and flame resistance can be remarkably improved as a whole fabric. I found it. The present invention has been completed by further studies based on these findings.

  That is, the present invention firstly is a fabric comprising a flame retardant fiber yarn and a conductive composite yarn, wherein the conductive composite yarn is arranged in a lattice pattern with an interval between the conductive composite yarn, , Composed of a core yarn containing a flame retardant fiber and a sheath yarn containing a conductive fiber, and the conductive composite yarn is thicker than the flame retardant fiber yarn, and is measured based on the JIS L1091 8.5E-2 method. The gist of the present invention is a flame retardant antistatic fabric characterized by having a limiting oxygen index (LOI value) of 25 or more.

  ADVANTAGE OF THE INVENTION According to this invention, the flame-retardant antistatic fabric which is excellent in antistaticity, a flame retardance, etc. and suitable for the uniform clothes which can be worn in the field | area in which suppression of static electricity is calculated | required can be provided.

  Hereinafter, the present invention will be described in detail.

  The flame retardant antistatic fabric of the present invention is basically composed of a flame retardant fiber yarn and a conductive composite yarn, the former constituting the ground yarn, and the latter having a space between the ground yarns. Are arranged.

  First, the flame-retardant fiber yarn in the present invention is basically composed of flame-retardant fibers, and is formed by bundling a plurality of fibers. The yarn may contain fibers other than the flame-retardant fibers as long as the effects of the present invention are not impaired. Examples of other fibers include natural fibers such as cotton and hemp, recycled fibers such as rayon, polynosic, cupra, lyocell, and acetate, polyesters, polyamides, polyolefins, polyurethanes, and the like. Among these, cellulose fibers are preferably used when it is desired to improve the texture and dyeability of the fabric, as well as shrinkage resistance and weather resistance, and in addition to this, when it is desired to further improve the flame retardancy, a flame retardant. It is preferable to use a cellulose fiber containing. For example, as a regenerated cellulose fiber kneaded with a flame retardant, there is “Lentining FR” manufactured by Lenzing.

  The form of the flame retardant fiber yarn may be any of spun yarn, multifilament yarn, and long and short filament yarn, and is not particularly limited. Furthermore, the single yarn fineness of the flame-retardant fiber yarn is preferably 0.6 to 4.2 dtex in general from the viewpoint of strength and the like, regardless of the yarn form. When using a fiber together, it is advantageous in terms of cost and productivity. The total fineness is preferably, for example, 10 to 50 in the case of spun yarn, and 50 to 550 dtex in the case of multifilament yarn.

  Moreover, when comprising a flame-retardant fiber yarn using a short fiber, it is preferable to set it as 10-60 mm as an average fiber length of the short fiber. In particular, when other fibers are used in combination, when the flame retardant fibers and the other fibers are both short fibers, it is preferable to make the fiber lengths of both fibers substantially the same from the viewpoint of productivity.

  As the flame retardant fiber constituting the flame retardant fiber yarn, fibers having a limiting oxygen index (LOI value) measured by JIS L1091 8.5E-2 method of preferably 32 or more, more preferably 35 or more are used. it can. Specifically, flame retardant vinylon fiber, meta-aramid fiber, para-aramid fiber, polyparaphenylene benzoxazole fiber, polybenzimidazole fiber, polyimide fiber, polyetherimide fiber, polyamideimide fiber, carbon fiber, polyphenylene sulfide Examples thereof include fiber, polyvinyl chloride fiber, flame retardant rayon, modacrylic fiber, flame retardant acrylic fiber, flame retardant polyester fiber, melamine fiber, fluorine fiber, flame retardant wool, and flame retardant processed cotton. Among these, flame retardant vinylon fibers having excellent flame retardancy and capable of being dyed are suitable, and flame retardant vinylon fibers having a LOI value of 32 or more, preferably 35 or more are particularly preferred. Examples of vinylon fibers having an LOI value of 32 or more include “Muron FR” manufactured by Unitika Trading.

  When vinylon fiber is used, the polymer constituting the fiber includes a polymer that is insoluble in water and hot water containing 70 mol% or more of vinyl alcohol units, or a vinyl alcohol unit and a vinyl chloride unit. A polymer having a total of 70 mol% or more of all structural units is preferred. In particular, in the case of the latter polymer, the content ratio of both units (vinyl alcohol unit / vinyl chloride unit) is preferably in the range of 85/15 to 35/65.

  In the present invention, particularly from the viewpoint of improving flame retardancy, a vinylon fiber having a total content of vinyl alcohol units and vinyl chloride units of 95 mol% or more of all the structural units is suitable, and in particular, both units are 98 mol% or more. Further, a fiber containing 99 mol% or more, particularly 99.8 mol% or more is preferable. The degree of polymerization of the polymer constituting the vinylon fiber is not particularly limited, but is preferably 500 or more and more preferably 1500 or more from the viewpoint of improving fiber strength.

  In addition, in the present invention, the polymer constituting the vinylon fiber may be acetalized as necessary, and thus improvement in water resistance and hot water resistance can be expected. Acetalization is usually carried out inside the polymer, between the polymers, or both, and the degree of acetalization at this time is preferably about 10 to 40 mol%. By adjusting the degree of acetalization, it is possible to reconcile hygroscopicity and water absorption, which are one of the basic characteristics of clothes, with the above water resistance and hot water resistance.

  When vinylon fiber is used in the present invention, one having flame retardancy is used. Examples of means for imparting flame retardancy include means for modifying the polymer itself and kneading a flame retardant into the fiber, and the latter means is generally preferred. Examples of the flame retardant at this time include tin compounds and antimony compounds.

  In addition, the polymer constituting the vinylon fiber may include a constituent unit other than the constituent units described above. Other units include monomer components such as ethylene, vinyl acetate, itaconic acid, vinylamine, acrylamide, vinyl bivalinate, maleic anhydride, and sulfonic acid-containing vinyl compounds. In addition, the vinylon fiber may contain any functional agent such as an antistatic agent, an antioxidant, a heat-resistant agent, and an antifouling agent as necessary.

  On the other hand, the conductive composite yarn in the present invention is composed of a core yarn containing a flame retardant fiber and a sheath yarn containing a conductive fiber. It is necessary to make a core-sheath structure from the viewpoint of conductivity. In the yarn in which the yarn containing the conductive fiber is arranged in the core portion, the conductivity is hardly exhibited, and a desired antistatic property cannot be expected.

  First, as the flame retardant fiber, the above-mentioned flame retardant fiber can be used, and flame retardant vinylon fiber is particularly preferable. The flame retardant fiber in the conductive composite yarn and the flame retardant fiber in the above-mentioned flame retardant fiber yarn do not necessarily need to be the same type, but it is usually preferable to use the same type.

  On the other hand, as the conductive fiber, a fiber composed of a polymer containing conductive fine particles and a fiber-forming polymer can be preferably used. As the conductive fine particles, for example, conductive carbon black, a metal simple substance, a metal compound, or the like can be used. Examples of the conductive carbon black include furnace black, ketjen black, acetylene black, and channel black. Examples of the simple metal include silver, nickel, copper, iron, and tin, and examples of the metal compound include copper sulfide, zinc sulfide, and copper iodide.

  Examples of the fiber-forming polymer include polyolefin polymers such as polyethylene and polypropylene, polyamide polymers such as nylon 6, nylon 66, and nylon 4, and polyester polymers such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate. However, it is not limited to these. In the present invention, polyester polymers are particularly preferred from the standpoints of washing resistance, form retention, and the like.

  In addition, the same polymer as that described above can be used for incorporating the conductive fine particles. In this case, a polymer different from the fiber-forming polymer may be used as the polymer, but it is preferable to use the same polymer because the delamination can be effectively suppressed when the fiber is used.

  Furthermore, in the conductive fiber, the arrangement of the polymer containing the conductive fine particles and the fiber-forming polymer is not particularly limited, but generally, when a large amount of the polymer containing the conductive fine particles is arranged on the fiber surface, It can be said that it is preferable in terms of antistatic properties because it is easy to secure a contact between the polymers at the intersection of the conductive composite yarns. However, when conductive carbon black is used as the conductive fine particles, if the polymer is exposed too much on the fiber surface, the fiber appearance tends to be black, and the appearance may be reduced when the fabric is used. Therefore, the exposure degree of the polymer is preferably suppressed to about 10 to 35% in terms of the surface area ratio. Preferred arrangements of both polymers include a state in which the polymer containing conductive fine particles is exposed at several positions on the fiber surface, and the exposed portions are continuously connected in the longitudinal direction of the fiber. Is also disposed in the fiber core, and the polymer in the core and the polymer exposed on the fiber surface are connected.

  The cross-sectional shape of the conductive fiber is arbitrary, but a round shape is usually preferable. Also, the form of the conductive fiber may be either a short fiber or a long fiber, but usually a long fiber is used from the viewpoint of conductivity.

The single yarn fineness of the conductive fiber is preferably 1.5 to 20 dtex. Further, when constituting the sheath yarn of the conductive composite yarn, it is common to use the fiber in the state of a multifilament yarn, and the total fineness at that time is preferably 20 to 45 dtex, and the electric resistance of the yarn The value is preferably 10 ⁵ to 10 ⁹ Ω / cm. Examples of multifilament yarns made of conductive fibers include “Beltron” manufactured by KB Seiren and “Megana” manufactured by Unitika Trading.

  The conductive composite yarn in the present invention is composed of the above flame-retardant fiber and conductive fiber, and has a core-sheath structure. In this respect, the fibers to be arranged in the core and sheath of the composite yarn need only contain flame retardant fibers in the core and conductive fibers in the sheath. It may be included. However, it is preferable that only the sheath portion is composed of conductive fibers from the viewpoint of conductivity. Generally, the mixing ratio of the conductive fibers is preferably about 10 to 50 parts by mass with respect to 100 parts by mass of the conductive composite yarn.

The conductive composite yarn may be used after being twisted as necessary, such as a twin yarn or a triple yarn.
By using the conductive composite yarn having such a configuration, it becomes easy to ensure the conductivity between the conductive fibers at the intersection of the conductive composite yarn in the fabric, and the antistatic property of the fabric is improved. At the same time, in the fabric, the ground yarn is composed of flame retardant fiber yarns and the composite yarn core is composed of flame retardant fibers, so that the mixture ratio of the flame retardant fibers is increased and the flame retardant is excellent as a whole fabric. Flameproofing will be achieved.

  And as other fibers that can be included in the composite yarn as necessary, the same fibers as other fibers that can be included in the flame-retardant fiber yarn as needed can be used, and the form of the fiber The same can be used for the fiber length. The other fibers that can be included in the composite yarn core portion and the other fibers that can be included in the flame-retardant fiber yarn may be the same or different.

  Next, the design of the fabric will be described.

  The fabric of the present invention includes flame retardant fiber yarns and conductive composite yarns, and the conductive composite yarns are arranged in a lattice pattern at intervals. That is, after using a flame-retardant fiber yarn as the ground yarn, one or a plurality of conductive composite yarns are arranged between the ground yarns and inserted in a lattice shape in the weft direction or the bias direction. In this respect, in light of the fact that the antistatic property is derived from the conductive fiber, it can be said that it is preferable from the viewpoint of improving the antistatic property that the fabric is composed only of the conductive composite yarn. However, conductive fibers are disadvantageous in that they are expensive and increase the manufacturing cost of the fabric. Furthermore, the strength is lower than that of general garment fibers, and if the mixing ratio is increased more than necessary, universal and basic characteristics such as tear strength and tensile strength tend to be lost. In addition, if the mixing ratio increases too much, for example, when conductive carbon black or the like is used as the conductive fine particles, the fiber appearance tends to be black, and the appearance of the fabric may be impaired accordingly. Therefore, it is preferable to suppress the amount of the conductive fiber used as long as the antistatic property is not impaired. In this sense, the composite yarns are arranged at intervals, thereby maintaining a balance between the antistatic property and the basic characteristics of the garment. In addition, the conductive fibers are generally poor in flame retardancy per se, and increasing the mixing ratio is not preferable from the viewpoint of flame retardancy. In other words, it can be said that the antistatic property and the flame retardancy are in a contradictory relationship. Therefore, the present inventor made trial and error in designing the fabric in order to balance both characteristics, and designed a fabric that exhibits excellent flame retardancy of LOI value 25 or more even when conductive fibers are used. is there.

  Here, the mixing ratio of the conductive fibers is preferably about 0.3 to 10 parts by mass with respect to 100 parts by mass of the fabric. Further, the mixing ratio of the conductive composite yarn is preferably about 5 to 30 parts by mass with respect to 100 parts by mass of the fabric.

The fabric of the present invention is excellent in antistatic performance as described above, and the index at this time is determined by the IEC (International Electrotechnical Commission) as described above. In the present invention, in accordance with this index, when a fabric is sewn and used as a garment, the surface resistance value measured based on IEC 61340-5-1 and 5-2 between any two points between which at least one stitch is sandwiched. It is preferably less than 1.0 × 10 ¹² Ω. Furthermore, in the present invention, in order to achieve this required characteristic, the surface resistance value based on IEC61340-5-1, 5-2 is used in any of the warp, weft, and bias method of the fabric in a state where the stitches are not sandwiched. Is preferably in the range of less than 1.0 × 10 ¹² Ω.

  As a device for designing the fabric to satisfy the IEC standard, it is necessary to make the conductive composite yarn thicker than the flame-retardant fiber yarn. When the composite yarn becomes thinner than the flame-retardant fiber yarn, the binding force by the structure is weakened as much as the composite yarn becomes thin, and the composite yarn is easily loosened in the structure. If it does so, it will become difficult for conductive fibers to contact in the intersection of a composite yarn, and it will become impossible to ensure sufficient electrical conductivity. Furthermore, the composite yarn is arranged in a recessed shape relative to the flame-retardant fiber yarn as the ground yarn, and the IEC standard cannot be achieved. The total fineness ratio of the conductive composite yarn and the flame retardant fiber yarn (conductive composite yarn / flame retardant fiber yarn) is preferably 1.1 to 2.0, more preferably 1.1 to 1.8. . When the total fineness ratio is less than 1.1, it is difficult to ensure conductivity as described above, and when it exceeds 2.0, although it is preferable at first glance in terms of conductivity, the composite yarn is excessively large relative to the ground yarn. Since it will be arranged in a raised shape, when it is later used as a garment, the conductive fibers tend to be easily cut due to rubbing and attrition received during wearing, which is not preferable.

  It is also effective to devise an interval for the arrangement of the conductive composite yarn in order to satisfy the IEC standard. Specifically, the conductive composite yarns are preferably arranged in a lattice pattern at intervals of 3 to 10 mm in the background or bias direction of the fabric, and more preferably 4 to 8 mm. When the thickness is less than 3 mm, it is preferable in terms of conductivity, but as a result of increasing the amount of conductive fibers used, the cost increases and the appearance and texture of the fabric tend to be reduced, which is not preferable. On the other hand, if it exceeds 10 mm, the antistatic property of the entire fabric tends to decrease, and the sewing width may have to be considerably wide so that the surface resistance value between the stitches does not increase, resulting in the production of clothes. The cost tends to increase, which is not preferable. Note that the lattice-like spacing does not necessarily have to be the same at every point.

  In addition, devising a sewing method is also effective in optimizing the surface resistance value. As a sewing method, any stitch such as main sewing, single ring sewing, double ring sewing, and overlock can be basically employed. In addition, any stitches such as winding stitches, folding stitches, interlocks, and piping can be adopted for the stitches, but four or more lap winding stitches are particularly effective in securing a contact point between the conductive fibers. In addition, it is also effective to improve the electrical conductivity by using a thread whose electrical resistance is kept low by using conductive fibers as a sewing thread. and so on.

Furthermore, in view of the fact that the fabric of the present invention is suitable for uniform clothes, it is preferable that the fabric has excellent antistatic washing durability in consideration of repeated use of the fabric. There are several indicators of wash durability. For example, after washing 30 times according to JIS L0217 103 method, the surface resistance value measured based on IEC 61340-5-1, 5-2 is between two arbitrary points sandwiching at least one stitch, and In the warp, weft, and bias method of the fabric without pinching the eyes, all satisfy the range of less than 1.0 × 10 ¹² Ω, and after washing 50 times according to JIS L0217 103 method, JIS L1094 5. For example, the frictional voltage measured based on 2 satisfies the range of 1000 V or less in the warp and weft directions of the fabric. It is recognized that the fabric satisfying these indices is excellent in washing durability. Among these, in light of the use as a uniform garment, the latter index relating to the frictional band voltage is particularly preferable as the index of washing durability in the present invention.

  With respect to the latter, it is possible to improve the washing durability applied to the frictional voltage by performing a durable antistatic process on the fabric. As the durable antistatic processing, for example, an antistatic polyurethane resin, antistatic polyester resin, antistatic acrylic resin, antistatic polyolefin resin, or the like may be used to form a film on the fabric surface. As a means for forming the film, any means such as a padding method, a spray method, a printing method, a coating method, a gravure processing method, and a foam processing method can be adopted. Among them, it is preferable to perform durable antistatic processing by a padding method using an antistatic polyurethane resin in that a durable film can be easily formed on a dyed fabric. Here, as an antistatic polyurethane resin, the urethane resin which has a polyalkylene glycol unit as an antistatic functional group can be illustrated.

  The fabric of the present invention is excellent not only in antistatic properties but also in flame retardancy and flame resistance. These characteristics are derived from the flame retardant fiber yarn contained in the ground yarn and the flame retardant fiber contained in the conductive composite yarn. Flame retardancy is indicated by a limiting oxygen index (LOI value) measured by the JISL1091 8.5E-2 method. This value needs to be 25 or more in the fabric of the present invention. And about flameproofing, two criteria which the public interest incorporated foundation Japan Flameproofing Association recognizes become an index. One is that it is evaluated by the flameproofing test method for clothes (vertical methane burner method) that the carbonization length is 17.8 cm or less on average and that there is no ignition of flame ignitable gauze, The first is a work-wear flame-proof test (ISO 15025): “After 5 times of washing with water (using weak alkaline synthetic detergent), it does not melt or drip, no flame spreads to the edge, no holes are opened, no residual flame “Time 2 seconds or less, residual dust time 2 seconds or less”.

  The flame retardancy and flame resistance of the fabric can be adjusted mainly by the type and mixing ratio of the flame retardant fibers used. However, since the problem of the present invention is to provide a flame-retardant and anti-static fabric mainly suitable for uniform clothes, not only flame retardancy and flame resistance but also texture and dyeability required for uniform clothes are considered. The fabric design is recommended. In that sense, a cellulose that can be dyed as a flame-retardant fiber, and at the same time, can impart not only a good texture and dyeability to the fabric, but also a shrink-proof property and an anti-mold property in the fabric. It is preferable to incorporate fibers. At this time, the mixing ratio of the flame retardant vinylon fiber and the cellulose fiber is preferably 55 to 85 parts by mass of the flame retardant vinylon fiber and 15 to 45 parts by mass of the cellulose fiber with respect to 100 parts by mass in total. It is more preferable that they are 60-75 mass parts of flammable vinylon fibers and 25-40 mass parts of cellulose fibers. Examples of cellulose fibers include cotton, hemp, rayon, cupra, lyocell, and the like, as long as they are contained in any place in the fabric. Thereby, characteristics, such as a texture and dyeing | staining property, can be provided, maintaining a desired flame retardance and flameproofness.

  Next, the preferable method for manufacturing the fabric of this invention is demonstrated.

  In the method of the present invention, first, flame-retardant fiber yarns, conductive composite yarns and other yarns as necessary are prepared. Other yarns may be produced by a known method by selecting any one of the above-mentioned other fibers.

  As described above, the flame-retardant fiber yarn is basically composed of flame-retardant fibers, and may contain other fibers as necessary. The method of incorporating other fibers is not particularly limited, and examples thereof include mixed spinning, mixed fiber, combined twisting, aligning, fine spinning and twisting, and composite false twisting.

  On the other hand, the conductive composite yarn can be obtained, for example, by supplying a yarn containing conductive fibers around a yarn containing flame retardant fibers. Both yarns may contain other fibers as necessary. Specifically, first prepare a yarn containing flame retardant fiber and a yarn containing conductive fiber, then add overfeed to the yarn containing conductive fiber, or adjust the tension and feed amount of both yarns Adjust the length of yarn between the yarns by adjusting them, then mix with yarns containing flame retardant fibers, entanglement, false twist, etc., or conductive around the yarns containing flame retardant fibers A conductive composite yarn can be obtained, for example, by sequentially winding yarns containing fibers. In the present invention, the latter method is particularly preferable, and a covering method can be exemplified as such a method. Examples of the covering method include single covering and double covering, and the double covering method is particularly preferable in terms of conductivity. By using the covering yarn, a lot of conductive fibers are exposed on the surface of the composite yarn, and the electrical conductivity and the antistatic property are remarkably improved.

  After preparing each yarn, weaving and knitting using them. In the case of woven fabrics, for example, warp a loom beam in which flame retardant fiber yarns are used as ground yarns, and one or more conductive composite yarns are arranged at regular intervals between the yarns. As the weft, the flame retardant fiber yarn and the conductive composite yarn may be wefted by repeating one to several conductive composite yarns for several to several tens of the flame retardant fiber yarns. At this time, if necessary, other yarns may be inserted into any position of the warp and weft. The structure of the woven fabric is not particularly limited, and examples thereof include a plain structure, a twill structure, and a satin structure. In particular, a plain structure tends to restrain warp and weft compared to other structures, and tends to be less susceptible to a decrease in antistatic properties due to the woven structure. As the loom, an air jet loom, a rapier loom, a fly shuttle loom, or the like can be used.

  On the other hand, in the case of a knitted fabric, an arbitrary knitted fabric such as a circular knitted fabric, a Russell knitted fabric or a tricot knitted fabric can be adopted. In this case, the flame-retardant fiber yarn is used as the ground yarn, and the conductive composite yarn may be knitted in the background or the bias direction at a certain ratio. The organization of the knitted fabric is not particularly limited, and examples include atlas, tricot half, etc. in addition to tengu, kanoko, and smooth.

  After weaving and knitting, dyeing is preferably performed for the purpose of imparting commercial value. Furthermore, after dyeing, if necessary, durable anti-static processing, heat-resistant processing, shrink-proof processing, anti-wrinkle processing, antibacterial processing, deodorization processing, antifouling processing, water absorption processing, flexible processing, and the like may be performed.

  The flame-retardant and anti-static fabric of the present invention is excellent in anti-static property, flame retardancy and the like, and can be designed optimally according to the purpose. Applicable to all clothing. Among them, it is suitable for uniform clothes used in electronic parts, precision parts, pharmaceuticals, food handling sites, medical sites, chemical factory sites, gas station sites, welding sites, steel manufacturing sites, fire sites, and the like.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these. The properties of the fabric were measured and evaluated by the following methods.

1. Flame retardance Based on JIS L1091 8.5E-2 method, the limiting oxygen index (LOI value) of the flame retardant vinylon fiber and the fabric was measured.

2. Flame resistance The flame resistance of the fabric was measured and evaluated based on the vertical methane burner method certified by the Japan Flame Protection Association and ISO 15025.

3. Antistatic property The surface resistance value of the fabric was measured based on IEC61340-5-1 and 5-2. The measurement was performed in a 23 ° C., 25% RH environment between the warp, weft, and bias method of the fabric, and two points 30 cm apart (a stitched portion in the table) across one stitch. In addition, about the stitching | suture part, the blister was sewed by four-layered lap sewing using "Sunderron" by Nippon-Ishimo dyeing company for a sewing thread, and the surface resistance value was measured about the stitching part in the said blouson.

4). Washing durability (1) A fabric which was washed 50 times according to JIS L0217 103 method was prepared, and the friction band voltage in the warp and weft directions of this fabric was measured based on JIS L1094 5.2. In the table, “initial” indicates the friction band voltage applied to the fabric before washing, and “after 50 washing” indicates the friction band voltage applied to the fabric after 50 washings.
(2) A fabric which was washed 30 times based on JIS L0217 103 method was prepared, and the surface resistance value of this fabric was measured by the same method as described in “3. In the table, “initial” refers to the surface resistance value applied to the fabric before washing, and “after 30 washing” refers to the surface resistance value applied to the fabric after 30 washings.

Example 1
Flame retardant vinylon fiber ("Muron FR" manufactured by Unitika Trading Co., Ltd., LOI value 35, single yarn fineness 1.5dtex, average fiber length 38mm) and cotton fiber blended in a ratio of 75 parts by weight vinylon fiber and 25 parts by weight cotton fiber Thus, a flame-retardant fiber yarn having a twist coefficient of 3.5 and a thickness of 15th was prepared. Then, the flame retardant fiber yarn was used as a core yarn, and a conductive multifilament yarn (“Megana E5” manufactured by Unitika Trading Co., Ltd., 28 dtex2f) was sequentially double covered at 300 T / M to obtain a conductive composite yarn.

  Subsequently, after warping a loom beam in which the flame retardant fiber yarn and the conductive composite yarn are arranged by repeating 16 flame retardant fiber yarns and one conductive composite yarn, the air jet loom is used. The flame retardant fiber yarn and the conductive composite yarn were weft-inserted by repeating 14 flame retardant fiber yarns and one conductive composite yarn, and a raw machine having a width of 163 cm and a 2/2 twill structure was obtained. The raw machine density was a warp density of 85 / 2.54 cm and a weft density of 75 / 2.54 cm.

  Then, the obtained raw machine was successively scoured, bleached and mercerized, and then dyed by a continuous dyeing method using a selenium dye.

  Next, an aqueous solution having the composition shown in Formula 1 below was prepared. And after immersing the dyed fabric in this aqueous solution and squeezing the fabric with a mangle so that the squeezing rate becomes 40%, it is dried and heat-treated at 170 ° C. for 2 minutes using a net dryer, A woven fabric having a width of 152 cm, a warp density of 91 / 2.54 cm, and a weft density of 76 / 2.54 cm. In the obtained woven fabric, the conductive composite yarns were arranged in a lattice pattern, and the interval between them was 5 mm in the weft direction. The total fineness ratio of the conductive composite yarn and the flame-retardant fiber yarn (conductive composite yarn / flame-retardant fiber yarn) was 1.14.

<Prescription 1>
TS897 (manufactured by Takamatsu Yushi Co., Ltd., containing antistatic polyurethane resin) 75g / L
CAT908K (manufactured by Takamatsu Yushi Co., Ltd., containing organotin compound catalyst) 5g / L

(Example 2)
A mixed spun yarn having the same configuration as the flame-retardant fiber yarn used in Example 1 and a conductive multifilament yarn used in Example 1 were prepared, respectively, except that the thickness was 30th. Then, the mixed yarn and the conductive multifilament yarn are twisted at 300 T / M while setting the latter to have a lower tension than the former, and then the two obtained twisted yarns are twisted at 570 T / M. Thus, a conductive composite yarn was obtained.

  Thereafter, a woven fabric was obtained in the same manner as in Example 1 except that the conductive composite yarn was used as the conductive composite yarn.

(Example 3)
Change the thickness of the flame-retardant fiber yarn as the ground yarn to 20th, change the weft insertion to 11 flame-retardant fiber yarns and 1 conductive composite yarn, and change the fabric structure to a plain structure Except doing, it carried out similarly to the case of Example 1, and obtained the raw material of width | variety 163 cm. The raw machine density was a warp density of 80 / 2.54 cm and a weft density of 60 / 2.54 cm.

  Thereafter, dyeing and durable antistatic processing were performed under the same conditions as in Example 1 to obtain a woven fabric having a width of 152 cm, a warp density of 85 / 2.54 cm, and a weft density of 61 / 2.54 cm. In the obtained woven fabric, the conductive composite yarns were arranged in a lattice pattern, and the interval between them was 5 mm in the weft direction. The total fineness ratio (conductive composite yarn / flame retardant fiber yarn) of the conductive composite yarn and the flame retardant fiber yarn was 1.52.

(Examples 4 and 5)
An aqueous solution having the composition shown in Formula 2 below was prepared. Fabrics were obtained in the same manner as in Examples 1 and 3 except that the aqueous solution of formulation 2 was used instead of the aqueous solution of formulation 1. An experimental example corresponding to Example 1 was set as Example 4, and an experimental example corresponding to Example 3 was set as Example 5.

<Prescription 2>
Sunsofter A700 conc. new (manufactured by Nikka Chemical Co., Ltd., containing an anionic softener) 20 g / L

(Comparative Example 1)
A woven fabric was obtained in the same manner as in Example 1 except that only the 15th flame retardant fiber yarn was inserted at the same driving density.

(Comparative Example 2)
A woven fabric was obtained in the same manner as in Example 1 except that the thickness of the core yarn of the conductive composite yarn was changed to 20th. In the obtained woven fabric, the total fineness ratio of the conductive composite yarn and the flame retardant fiber yarn (conductive composite yarn / flame retardant fiber yarn) was 0.89.

  Table 1 shows the measurement and evaluation results of the fabrics obtained in the above Examples and Comparative Examples.

  The woven fabric according to the example was excellent in antistatic property, flame retardancy and flameproofness, and excellent in antistatic washing durability. In addition, the sewn blouson also satisfied the IEC standards. Furthermore, in the woven fabric according to the example, the texture was good because cotton was used in combination, and the tailored blouson was excellent in wearing feeling and looked good.

  In particular, when the fabric of Example 1 using the covering yarn as the conductive composite yarn is compared with the fabric of Example 2 using the twisted yarn, the former is generally superior to the latter in terms of antistatic properties. It was. Furthermore, since the fabrics according to Examples 4 and 5 were softened, the texture was particularly excellent. However, with respect to washing durability, compared with the fabrics of Examples 1 and 3 subjected to durable antistatic processing, the results were inferior particularly in terms of washing durability concerning the frictional band voltage.

On the other hand, in the woven fabric according to Comparative Example 1, although conductive composite yarns are used, the composite yarns are not intermingled with each other, and as a result, sufficient electrical conductivity cannot be secured, resulting in lack of antistatic properties. . In Comparative Example 2, since the conductive composite yarn was thinner than the flame retardant fiber yarn, the conductive composite yarn loosened in the fabric, and sufficient electrical conductivity could not be secured. For this reason, it became the textile lacking in antistatic property. Furthermore, IEC standards could not be met.

Claims (6)

A fabric including a flame retardant fiber yarn and a conductive composite yarn, wherein the conductive composite yarn is arranged in a lattice pattern with an interval, and the conductive composite yarn includes a core yarn including the flame retardant fiber; A sheath yarn containing conductive fibers, the conductive composite yarn is thicker than the flame retardant fiber yarn,
The flame retardant fiber yarn is composed of a flame retardant vinylon fiber, and the flame retardant fiber contained in the core yarn of the conductive composite yarn is a flame retardant vinylon fiber,
A flame-retardant antistatic fabric characterized by having a limiting oxygen index (LOI value) of 25 or more measured based on JIS L1091 8.5E-2 method. Furthermore, the cellulose fiber is included in the fabric, and the mixing ratio of the flame retardant vinylon fiber and the cellulose fiber is 55 to 85 parts by mass of the flame retardant vinylon fiber and 15 to 45 parts by mass of the cellulose fiber with respect to 100 parts by mass in total. The flame-retardant antistatic fabric according to claim 1 . The flame retardant and antistatic fabric according to claim 1 or 2 , wherein the conductive composite yarn is a covering yarn. The flame-retardant antistatic fabric according to any one of claims 1 to 3, wherein the conductive composite yarns are arranged at intervals of 3 to 10 mm in the background or the bias direction. The difficulty according to any one of claims 1 to 4, wherein the friction band voltage of the fabric measured based on JIS L1094 5.2 is 50 V or less after washing 50 times according to JIS L0217 103 method. Combustion electric fabric. An IEC (International Electrotechnical Commission) 61340-5 between any two points that are sewn using the flame-retardant antistatic fabric according to any one of claims 1 to 5 and sandwich at least one stitch. A surface resistance value measured on the basis of -1, 5-2 is less than 1.0 × 10 ¹² Ω.