JP2017203220A - Magnetizable fiber, method for producing the same, twisted yarn and magnetized fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber having use feeling of being lightness, of not being musty, of being free from oppressive feeling and of being good in followability to the movement of the body, having good usability of being easy to be mounted and of free from slippage, additionally, excellent in daily durability such as cleaning resistance, a temperature change and flexibility, and excellent in the utilizability of a magnetism.SOLUTION: Provided is a magnetizable fiber comprising a thermoplastic elastomer and rare earth magnetic powder, and having a surface magnetic flux density of 0.50 mT or more.SELECTED DRAWING: None

Description

  The present invention relates to a magnetized fiber, a method for producing the same, a twisted yarn, and a magnetized fabric.

  It is well known that the magnetic force has a lightening effect and blood circulation promoting effect on stiff shoulders, muscle pain, low back pain, etc., and magnetic fibers, fabric fibers, fabrics, etc. have been developed to utilize the effects. Has been.

  These fibers and fabrics are used as materials for health devices, medical devices, or daily necessities that maintain health based on the effect of reducing the magnetic force and promoting blood circulation.

  Such materials include, for example, fiber-forming thermoplastics as magnetic fibers that exhibit a rough surface state of the fiber surface, various process properties such as spinning and drawing, degradation of mechanical properties of the fiber, and sufficiently exhibit magnetic properties. There is a composite fiber composed of a protective layer component (A) made of a polymer and a polymer layer component (B) containing 5 to 85% by weight of magnetic particles (Patent Document 1).

  In addition, magnetic fibers containing fine particles and spherical magnetic particles are known as magnetic fibers that are excellent in single fiber properties, exhibit sufficient workability to form paper, nonwoven fabrics, woven fabrics, knitted fabrics, and the like, and have excellent magnetic properties. (Patent Document 2).

  Furthermore, health clothing using magnetic cellulose fibers having a surface magnetic flux density of 5 to 50 gauss is known (Patent Document 3).

  Further, as a woven fabric that can be processed in the same manner as a normal fabric and can record magnetic bar code information, a ferrimagnetic powder having a coercive force of 50 oersted or more and a thermoplastic polymer containing magnetic particles of ferromagnetic powder are used. A polyester mesh fabric woven with a core-sheath composite magnetic monofilament having a core component and polyester as a sheath component is known (Patent Document 4).

  After applying a mixture of magnetic powder and thermoplastic resin powder to the fiber, the fiber is heat-treated, pressure-treated, and then magnetized, so that the surface magnetic properties do not impair the physical properties of the fiber. A magnetic fiber product of 100 gauss or more is known (Patent Document 5).

  In addition, as a method for producing magnetic fibers capable of continuously producing magnetic fibers excellent in stretchability, strength and smoothness by melt spinning, a composite process in which a nylon resin binder and magnetic powder are combined to produce a resin composition There is known a method for producing a magnetic fiber having a melt spinning process in which the resin composition is melted and extruded into a yarn shape, and a stretching process in which the obtained yarn is stretched (Patent Document 6).

JP-A-6-108309 JP-A-7-197311 JP 7-299152 A JP 2000-314045 A JP 2004-52159 A JP 2004-91932 A

  However, in the invention of Patent Document 1, nylon fiber is described, but since it is a composite fiber, there is a problem that flexibility is difficult, and in the case of a fabric, there is a problem that followability to the body is not sufficient.

  The invention of Patent Document 2 is a so-called acrylic fiber mainly composed of an acrylonitrile-based polymer, but it is difficult to say that it is suitable for a fabric because it is vulnerable to temperature changes. In addition, the invention of Patent Document 3 uses a magnetic rayon yarn as a fabric together with a non-magnetic yarn, and it is difficult to adhere to the body. In invention of patent document 4, since it is a core-sheath composite magnetic monofilament, there exists a limit in a softness | flexibility. The invention of Patent Document 5 applies magnetic powder to a cloth, and the fiber itself does not have magnetism.

  The invention of Patent Document 6 is merely an invention for a magnetic powder-containing nylon fiber, and there is no description as to how much surface magnetic flux density the fiber has.

  In addition, magnetic therapy is actually performed in osteopaths, etc., and in order to increase the effect of magnetic therapy, the entire affected area is directly or indirectly subjected to magnetic force rather than applying a magnet locally to the acupoint of the human body. It has been confirmed that the product is effective even if the magnetic force is weak by wearing the product for a long time.

  At present osteopaths and the like, magnet-coated sheets and patch agents containing ferritic magnet powder are actually used in place of shipping agent drugs, and the effect has been confirmed, but magnet-coated sheets Is hard, heavy, and has problems such as rugged areas in contact with the skin. Since the adhesive containing the magnetic powder has no breathability, there is a problem that the adhesive becomes stuffy when it is applied for a long time.

  As described above, the conventional magnetic fibers have their respective problems, and even if they are worn for a long time, which is required for a health device, a medical device, or a daily product for maintaining health, for the above effect of magnetic force, or In addition to ease of use such as no side effects, lightness, no stuffiness, no feeling of pressure, good follow-up to body movement, easy to wear, no slippage, and daily durability For example, it was in a situation where properties such as washing resistance, temperature change resistance, and bending resistance could not be satisfied.

  The fibers having these properties are nylon fibers or fabrics made of nylon fibers that have high toughness, excellent tensile strength, heat resistance, chemical resistance, impact resistance, and wear resistance. However, a polyamide fiber or nylon fabric having the above-described characteristics and having an appropriate magnetic force on the body has not been known so far. The reason is that, in the case of fibers in which a magnetic powder is contained in a resin such as nylon 6 or nylon 12, a hard yarn having a yarn strength of 0.6 cN / dtx or less and an elongation of 20% or less even when drawn. It was because it was only obtained. When a magnetic material is included, the yarn has low strength and low elongation. Therefore, many yarn breaks occur in the drawing process during spinning, and thin yarns with a diameter of 0.1 to 0.2 mm cannot be produced. It was. Furthermore, even when the yarn has a diameter of 0.1 to 0.2 mm, the Young's modulus is 10 cN / dtx at the time of knitting and the yarn is hard and difficult to knitting. High and industrial production was difficult. This is because the product knitted fabric became a hard and firm knitted fabric, and only a fabric having a poor wearing feeling was obtained.

  As a result of diligent research, the present inventor has found that when a rare earth magnetic powder is mixed with a thermoplastic elastomer to form a magnetic fiber, the tensile strength at break is as low as about 1/2 that of nylon 12, but the tensile elongation at break is high. Focusing on the fact that it is a resin with a low bending / tensile modulus, the result of spinning a 0.1 mm diameter yarn by containing a magnetic material was that it was possible to spin without breakage in the drawing process. The magnetized fiber can be a fiber having excellent flexibility and stretchability than ordinary nylon fiber, and even if the fiber contains a rare earth powder, the properties of the fiber can be maintained. And the present invention has been completed.

  That is, the problem of the present invention is that there is no side effect even if it is worn or used for a long time, it is light, does not stuffy, there is no feeling of pressure, it is easy to wear, slippery In addition to ease of use such as no use, it is excellent in daily durability, such as washing resistance, temperature change, bending resistance, etc. Provided is a twisted yarn and fabric.

  The present invention is a magnetized fiber comprising a thermoplastic elastomer and a rare earth magnetic powder and having a surface magnetic flux density of 0.5 millitesla or more.

  The magnetized fiber of the present invention has a diameter of 0.1 mm to 2.0 mm, a breaking strength of 0.4 cN / dtx or more, a breaking elongation of 40 to 120%, and a 10% elongation recovery rate of 70% or more. The Young's modulus is 1.0 to 10 cN / dtx, and the thermoplastic elastomer is at least one of a polyamide-based elastomer and a polyester-based elastomer.

  The magnetized fiber of the present invention has a diameter of 0.5 mm to 5.0 mm, a breaking elongation of 100 to 300%, a 20% elongation recovery rate of 80% or more, and a Young's modulus of 0.1 to 5. 0 cN / dtx, and the thermoplastic elastomer is at least one of an olefin elastomer, a styrene elastomer, and a urethane elastomer.

Further, according to the present invention, the rare earth magnetic powder includes samarium-cobalt magnet (SmCo _2-17 ), samarium-iron-nitrogen magnet (SmFeN), samarium-zirconium-iron-cobalt-boron-nitrogen magnet (SmZrFeCoBN), neodymium- It is characterized by being at least one powder of an iron-boron magnet (NdFeB) and a bonded magnet containing these magnetic powders.

  Moreover, this invention is a twisted yarn of the above-mentioned magnetized fiber, Comprising: The diameter of the said twisted yarn is 1.0 mm-20 mm, The twisted yarn of the magnetized fiber characterized by the above-mentioned. Furthermore, the present invention is a magnetized fabric comprising the above magnetized fiber.

The present invention also includes a mixing step of mixing the thermoplastic elastomer raw material and the rare earth magnetic powder in a fluidized state,
A spinning step of spinning a mixture of the thermoplastic elastomer raw material and the rare earth magnetic powder mixed in the mixing step;
A method of producing a magnetized fiber having a surface magnetic flux density of 0.5 mT or more, comprising a drawing step of drawing the fiber obtained in the spinning step.

  The magnetized fiber of the present invention is light, rich in flexibility, has stretchability, and is excellent in recoverability. By adjusting the content of the rare earth magnetic powder to be contained, the magnetism to the body can be made appropriate.

  In addition, when the magnetized fiber of the present invention is used as a fabric, it is light, does not stuffy, has no feeling of pressure, has good followability to body movement, is easy to wear, does not deviate from the body wearing site, and is washed. Because it is a fabric excellent in resistance, temperature change, bending resistance, etc., for a health device, a medical device, or a daily product for maintaining health aimed at the effect based on the lightening effect of the magnetic force and the blood circulation promoting effect It can be said that it is the best material.

  Such a magnetized fabric is excellent in deformability according to the shape of the body and is excellent in followability corresponding to the movement of the body.

  In addition, the magnetized fiber of the present invention can impart predetermined magnetism to the fiber by being magnetized after production. Further, the fibers of the present invention can be magnetized after being combined with several twisted yarns after production.

  Furthermore, even when the magnetized fiber is a fabric, magnetism can be uniformly applied to the entire fabric by magnetizing in the same manner as described above.

  According to the present invention, the magnetized fiber includes a thermoplastic elastomer and a rare earth magnetic powder, and has a surface magnetic flux density of 0.5 millitesla or more. Therefore, the magnetized fiber has a high magnetic force and a high tensile breaking elongation. It is a flexible fiber that has higher strength than resin, high elongation, and low Young's modulus. In addition, because it contains rare earth magnetic powder, the surface magnetic flux density of the target can be obtained even if the amount added to the resin is small due to its high magnetic force. Has the effect.

  Furthermore, the specific gravity of the samarium-based magnetic powder is as high as 7, for example, when 50% by weight is mixed with the resin, the polyamide elastomer resin of the thermoplastic elastomer has a specific gravity of 1.0, and the styrene elastomer / olefin elastomer resin is Since the specific gravity is as low as 0.87, the volume mixing ratio of the magnetic material powder is 12.2% and 10.8%. In the case of polyamide elastomer resin, styrene elastomer / olefin elastomer resin, the volume ratio of thermoplastic elastomer is Since it becomes high, there is an advantage that the spinnability is improved and the decrease in physical properties is reduced.

  According to the present invention, the magnetized fiber has a diameter of 0.1 mm to 2.0 mm, a breaking strength of 0.4 cN / dtx or more, a breaking elongation of 40 to 120%, and 10% elongation recovery. It is at least one of a polyamide-based elastomer and a polyester-based elastomer having a rate of 70% or more and a Young's modulus of 1.0 to 10 cN / dtx.

  The magnetic fiber of the present invention has a diameter of 0.1 mm and has a low Young's modulus and is very soft and high elongation compared to normal nylon 12 resin and polyester resin magnetic fibers. It is easy to knit because the yarn breakage during standing is unlikely to occur. In addition, because it has stretch properties, it can produce a product that fits the body, there is no sense of incongruity even if worn for a long time, and the stretch recovery property is high, so the knitted fabric structure is not deformed even after repeated wear. The effect that a fabric is obtained is obtained.

  The magnetized fiber of the present invention has a diameter of 0.5 mm to 5.0 mm, an elongation at break of 100 to 300%, a 20% elongation recovery rate of 80% or more, and a Young's modulus of 0.1 to 5. 0 cN / dtx, and the thermoplastic elastomer is at least one of an olefin elastomer, a styrene elastomer, and a urethane elastomer.

  The thermoplastic elastomer of the present invention is a magnetic fiber made of an olefin elastomer, a styrene elastomer, or a urethane elastomer, and has a Young's modulus lower than that of the nylon elastomer or polyester elastomer even if the fiber diameter is 1.0 mm or more, Since it is a soft, highly stretched magnetic fiber, it has excellent processability during weaving. Furthermore, when using a twisted yarn, there is a feature that it is soft and easy to twist. Products such as neck loops have a low bending rigidity, so products with excellent wearing feeling can be obtained.

According to the present invention, the rare earth magnetic powder is samarium-cobalt magnet (SmCo _2-17 ), samarium-iron-nitrogen magnet (SmFeN), samarium-zirconium-iron-cobalt-boron-nitrogen magnet (SmZrFeCoBN), neodymium- It is at least one powder of an iron-boron magnet (NdFeB) and a bonded magnet containing these magnetic powders. Samarium-based magnetic materials are resistant to rust and do not rust due to sweat when worn, making it possible to make products such as underwear that come in direct contact with the skin.

  Neodymium magnets are cheaper and have a lower specific gravity than samarium magnets. Nylon 12 resin bonded magnets containing these magnetic powders are coated with nylon resin, so when added to a thermoplastic elastomer, the magnetic powders will deposit on the surface of the yarn and will not easily fall off. The effect of having the following features is obtained.

  Furthermore, according to this invention, it is the twisted yarn which consists of one of the said magnetized fibers, Comprising: The diameter of the said twisted yarn is 1.0 mm-20 mm, It is the twisted yarn of the magnetized fiber characterized by the above-mentioned.

  In order to obtain a magnetized fiber having a magnetic force with a high magnetic flux density, it is conceivable to increase the content of the magnetic powder, but in that case, the diameter of the fiber increases and the yarn is thick and hard, so only limited fabrics are produced. However, since the magnetic yarn obtained by twisting thin magnetic fibers is much softer than the single yarn 1.0 mm diameter magnetic yarn, there is an advantage that weaving and knitting becomes easy and various fabrics can be manufactured. Further, by twisting, there is no gap between the yarns, and the entire yarn is magnetized as one yarn, so that there is an advantage that a twisted magnetic yarn having a high surface magnetic flux density can be obtained. .

  Furthermore, according to the present invention, since it is a magnetic fabric made of the above-mentioned magnetic fibers, there is no side effect even if it is worn or used for a long time, and it is light, does not stuffy, has no feeling of pressure when worn, In addition to usability such as good followability to movement, ease of wearing, and ease of use such as no slippage, it also has the effect of satisfying daily durability such as washing resistance, temperature change, bending resistance, etc. It is done.

  The magnetized fiber of the present invention is a magnetized fiber containing a thermoplastic elastomer and a rare earth magnetic powder and having a surface magnetic flux density of 0.5 millitesla or more.

  In the present invention, the magnetized fiber means that the thermoplastic elastomer constitutes the main component of the entire fiber. The rare earth magnetic powder is present in a state of being uniformly dispersed in the fiber.

  Further, the magnetization in the magnetized fiber of the present invention means that when the magnetized fiber is magnetized, the surface magnetic flux density has a magnetic force of 0.50 millitesla or more as measured by a Tesla meter. .

The surface magnetic flux density of the magnetized fiber of the present invention is a magnetism obtained by cutting the sensor part into a length of 10 cm under the measurement conditions of a measurement range of 0 to 200 mm Tesla and a resolution of 0.1 m Tesla with a Teselameter TM-801 manufactured by KANETEC. Contact was made in a direction perpendicular to the central portion of the fiber, the magnetized fiber was rotated in the circumferential direction, and the maximum surface magnetic flux density (millitesla) in the circumferential direction was measured.
A 1 m long magnetized fiber was cut every 10 cm, the cut 10 cm long magnetized fiber was measured as described above, and an arithmetic average value was obtained from a total of 10 measured values to obtain a surface magnetic flux density. .

  Further, the magnetized fiber in which the thermoplastic elastomer of the present invention is composed of at least one of a polyamide-based elastomer and a polyester-based elastomer has a diameter of 0.1 mm to 2.0 mm, preferably 0.1 to 1.0 mm, Particularly preferably, it has a diameter of 0.1 to 0.8 mm.

  Furthermore, the breaking strength is 0.4 cN / dtx or more, preferably 0.5 to 2.0 cN / dtx, and particularly preferably 0.5 to 1.0 cN / dtx.

  The present invention is a magnetized fiber containing a magnetic material having a high specific gravity, which is about twice as high as that of a fiber not containing a normal magnetic material. The breaking strength (cN / dtx) is a value obtained by measuring the breaking strength (N) and dividing the breaking strength by decitex (dtx), and the tex is a weight (g) per 1000 m. Since the specific gravity of the magnetized fiber of the present invention is about twice, the decitex value is about twice. When compared with normal nylon having the same fiber diameter, even if the breaking strength value is the same, the breaking strength is indicated by about a half of the value, so that it appears to be a low value.

  Further, the elongation at break is 40 to 120%, preferably 60 to 120%, particularly preferably 60 to 100%. The recovery rate at 10% elongation is 70% or more, preferably 80 to 100%, particularly preferably 90 to 100%.

  Furthermore, the Young's modulus is 1.0 to 10 cN / dtx, preferably 1.0 to 7.0 cN / dtx, and particularly preferably 1.0 to 5.0 cN / dtx.

  Moreover, the diameter of the magnetized fiber in which the thermoplastic elastomer of the present invention is at least one of an olefin elastomer, a styrene elastomer and a urethane elastomer is 0.5 mm to 5.0 mm, preferably 0.8. Those having a diameter of ˜5.0 mm, particularly preferably 1.0 to 4.0 mm. Further, the elongation at break is 100 to 300%, preferably 100 to 250%, particularly preferably 150 to 250%.

Further, the recovery rate at 20% elongation is 80% or more, preferably 80 to 100%, particularly preferably 90 to 100%.
Furthermore, the Young's modulus is 0.1 to 5.0 cN / dtx, preferably 0.1 to 2.0 cN / dtx, and particularly preferably 0.1 to 1.0 cN / dtx.

The magnetized fiber of the present invention may have a circular cross section, may have various shapes such as an ellipse, a rectangle, and a star, and may be a sheath-core type two-layer yarn.
When the magnetized fiber of the present invention has a multilayer structure such as the sheath-core type two-layer yarn, the rare earth magnetic powder is contained in the sheath portion, the core portion, or both of them. In the case of inclusion in both, the content ratio may be changed.

  The diameter when the magnetized fiber of the present invention is not circular means the diameter of the longest portion of the fiber cross section.

  In the present invention, examples of the thermoplastic elastomer include polyamide elastomers, olefin elastomers, styrene elastomers, ester elastomers, and urethane elastomers.

Since thermoplastic elastomers require fluidity at high temperatures, they are composed of a plastic component (hard segment) and an elastic component (soft segment), and a block polymer type in which a hard segment and a soft segment are chemically bonded in a single polymer. In the present invention, any type of thermoplastic elastomer can be suitably used. .
Examples of the polyamide-based elastomer include those containing an aliphatic polyether and a non-aromatic polyester in addition to polyamide.

  Examples of polyamides include one or more polymers of lactams such as ε-caprolactam and ω-laurolactam, and one or more polymers of aminocarboxylic acids such as 6-aminocaproic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid. Or one or more aliphatic diamines such as hexamethylene diamine, nonamethylene diamine, undecamethylene diamine, dodecamethylene diamine, and one aliphatic dicarboxylic acid such as succinic acid, adipic acid, sebacic acid, azelaic acid It is a polycondensate with the above.

  Specific examples of such polyamides include nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon 612, and copolymerized nylon. Among these, nylon 6, nylon 11, and nylon 12 are preferable.

  Furthermore, as the aliphatic polyether block, the weight average molecular weight is preferably 400 to 6000, more preferably 500 to 4000, and particularly preferably 600 to 3000, polyethylene glycol, polypropylene ether glycol, polytrimethylene ether glycol, polytetramethylene. Methylene ether glycol, polyhexamethylene ether glycol, block or random copolymer of ethylene oxide and propylene oxide, polyalkylene ether glycol such as block or random copolymer of ethylene oxide and tetrahydrofuran, preferably composed of polytetramethylene ether glycol can give.

  Non-aromatic polyesters include oxalic acid, succinic acid, adipic acid, azelaic acid, sebacic acid and other aliphatic dicarboxylic acids, or hexahydroterephthalic acid, hexahydroisophthalic acid, dicyclohexyl-4,4′-dicarboxylic acid. One or more of alicyclic dicarboxylic acids such as ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, or other aliphatic diols, or 1,4-cyclohexanediol, 1,4-cyclohexanedi It is a polycondensate with one or more alicyclic diols such as methanol, or a lactone such as ε-caprolactone or one or more polymers of an aliphatic monool carboxylic acid such as ω-oxycaproic acid. It is done.

  The polyamide-based elastomer has a hard segment of polyamide and a soft segment of polyether. These may be produced by a known method. Examples of the thermoplastic elastomer include “Pebax” (registered trademark, manufactured by Arkema Co., Ltd.), “Vestamide / Diamid” (registered trademark, Daicel Evonik). And Uvesta Expa (registered trademark, manufactured by Ube Industries Co., Ltd.).

  Among the above-mentioned polyamide elastomers, “Uvesta Expa” is a polyamide polyether block copolymer in which the hard segment is nylon 12 and the soft segment is an aliphatic polyether block. There is a feature that does not have.

  Thus, a flexible fiber having excellent hydrolysis resistance, low tensile elastic modulus, and low Young's modulus is obtained. In addition, it has high tensile elongation at break, stretchability, excellent recovery, bending fatigue, and low-temperature flexibility. Since it can be set as the magnetic tool excellent in the followability and durability with respect to a motion, it is preferable.

  Examples of the ester elastomer include those obtained by using polybutylene terephthalate (PBT) as a hard segment and copolymerizing a polyether as a soft segment.

  Examples of such ester elastomers include commercially available products such as Hytrel (registered trademark, manufactured by Toray DuPont Co., Ltd.), Primalloy (registered trademark, manufactured by Mitsubishi Chemical Corporation), and Perprene (registered trademark, manufactured by Toyobo Co., Ltd.). It is done.

  As the olefin elastomer, polypropylene (PP) is used as a hard segment, and non-crosslinked EPM (ethylene / propylene rubber), partially crosslinked EPDM (ethylene / propylene / diene rubber), and fully crosslinked EPDM (ethylene / propylene) as a soft segment. In addition to blends of gen rubber, polypropylene (PP) and polyethylene are copolymerized.

  Examples of such olefin-based elastomers include Miralastomer, Tuffmer (registered trademark, manufactured by Mitsui Chemicals), Espolex (registered trademark, manufactured by Sumitomo Chemical Co., Ltd.), Thermoran, Zelas (registered trademark, manufactured by Mitsubishi Chemical Corporation), JSR. Examples include commercially available products such as EXELINK (manufactured by JSR Corporation).

  Examples of the styrene elastomer include those obtained by copolymerizing both polystyrene (PS) as a hard segment and polybutadiene, hydrogenated polybutadiene, and hydrogenated polyisobutylene as soft segments.

  Examples of such styrenic elastomers include TUFPRENE, TUFTEC (registered trademark, manufactured by Asahi Kasei Corporation), LAVALON (registered trademark, manufactured by Mitsubishi Chemical Corporation), Esporex (registered trademark, manufactured by Sumitomo Chemical Co., Ltd.), RB, TR, Commercially available products such as SIS (manufactured by JSR Corporation) can be mentioned.

  Examples of the urethane elastomer include those obtained by using polyurethane as a hard segment and copolymerizing polyether, polyester, etc. as a soft segment. Examples of such urethane elastomers include resamine (registered trademark, manufactured by Dainichi Seika Kogyo Co., Ltd.), pandex (manufactured by DIC Covestro Polymer Co., Ltd.), miractron (registered trademark, manufactured by Nippon Miractron Co., Ltd.), loglan (registered) And a commercially available product such as BASF INOAC Polyurethane Co., Ltd.).

  The magnetized fiber of the present invention may contain components such as a smoothing agent and a colorant.

  In the present invention, any magnetic powder may be used as long as it contains a rare earth element such as samarium or neodymium. These magnetic powders can be used alone or in admixture of two or more.

Specific examples of the rare earth magnetic powder include samarium-cobalt magnets (SmCo _2-17 ), samarium-iron-nitrogen magnets (SmFeN), and samarium-zirconium-iron-cobalt-boron-nitrogen. Examples include magnets (SmZrFeCoBN), neodymium-iron-boron magnets (NdFeB), and powders thereof. Further, even a bonded magnet of these magnetic powders can be suitably used.

  The rare earth magnetic powder may be a powder or a spherical particle. In particular, the spherical particle is unlikely to aggregate and is easily dispersed uniformly in the fiber. It may be compounded with nylon 12 resin like a bond magnet. The content of the rare earth magnetic powder in the fiber is 20.0 to 80% by weight, preferably 30 to 70% by weight, particularly preferably 40 to 70% by weight.

  The magnetized fiber of the present invention comprises a mixing step of mixing a thermoplastic elastomer raw material and a rare earth magnetic powder in a fluidized state, and a thermoplastic elastomer raw material and a rare earth magnetic powder powder mixed in the mixing step. Can be produced by carrying out a spinning step of spinning a mixture of the above and a stretching step of stretching the fiber obtained in the spinning step.

  Magnetization may be performed after the drawing process is completed, or may be performed after combining the magnetized fibers, or may be performed after forming a magnetized fabric such as a woven or knitted fabric. Good.

  For example, when a polyamide-based elastomer or a polyester-based elastomer is used, when the magnetic fiber having a diameter of 2.0 mm or more after finishing the stretching process is magnetized, the bending rigidity of the fiber becomes high and the knitting process becomes difficult. There arises a problem that the texture of the finished fabric becomes hard. In such a case, weaving and knitting can be facilitated by reducing the bending rigidity by combining magnetic fibers having a diameter of 0.1 mm to 0.5 mm to 2.0 mm. A soft texture can be obtained.

  When a polystyrene elastomer, a polyolefin elastomer or a polyurethane elastomer is used, the fiber has a low Young's modulus, a low bending rigidity and a flexible fiber, so that weaving and knitting with a single yarn is possible even with a 5 mm diameter.

  However, when the combined yarn is magnetized by simple alignment, the entire combined yarn is not magnetized by the S and N poles, but is magnetized one by one. Since it attracts and neutralizes, the surface magnetic flux density decreases. When using a twisted yarn or the like to form a combined yarn, it is necessary to perform the magnetizing process after leaving no gap between the yarns.

  Similarly, when obtaining a surface magnetic flux density of 20 millitesla or more, a thickness of 2.0 mm or more is required if one thread is used. When a polyamide-based elastomer or a polyester-based elastomer is used for the yarn having such a thickness, it is hard and difficult to fabricate. Likewise, the number of combined yarns of magnetic fibers having a diameter of 0.1 mm to 0.5 mm may be adjusted to obtain a combined yarn having a desired surface magnetic flux density.

  When using a polystyrene elastomer, polyolefin elastomer, or polyurethane elastomer, the number of yarns of 0.5 to 2.0 mm diameter magnetic fiber is used because the yarn is softer than when using a polyamide elastomer or a polyester elastomer. Is adjusted to obtain a yarn having a desired surface magnetic flux density.

  The method of combining yarns is to combine several yarns that have been twisted with a ring twister or flyer twister as in the case of sewing thread manufacture, and to twist in the opposite direction to the lower twist, The added yarns are further combined and twisted in the direction opposite to the upper twist to form a yarn, and the yarn may be further twisted to form a strand, and the strand may be further combined to form a rope. Furthermore, it is good also as a combined yarn by a blade machine like braid manufacture.

  The number of twists and the number of beats are adjusted as appropriate according to the thickness of the base yarn. When there is no gap between the yarns and the yarn is magnetized, the entire yarn is magnetized in the cross-sectional direction as a single yarn. What should I do? When the yarns are combined in this way, if the diameter increases, the yarns are hard and even if the yarns are combined, a gap is formed between the yarns and the entire yarn is not magnetized as a single yarn. In this case, it is preferable to use a soft fiber having a diameter of 1.0 mm or less.

  Furthermore, when magnetizing with a cloth, the magnetization pattern can be changed, and the magnet can be magnetized to two poles on one side, two poles on both sides, and one side multipole. At the stage where the desired health device, medical device or daily necessities for maintaining health are molded, a space is provided between the S and N poles so that magnetic lines of force fly between the S and N poles. By doing, it can be set as an effective health device, a medical device, etc. by a magnetic force line.

  In the mixing step, the thermoplastic elastomer and the magnetic powder are mixed in a fluid state. Specifically, the thermoplastic elastomer is heated and melted, and the magnetic powder is added to and mixed with the thermoplastic elastomer to obtain a melt of the thermoplastic elastomer and the magnetic powder, or the thermoplastic elastomer and the magnetic powder powder. The mixture can be heated and melted while mixing and mixed to obtain the melt.

  At this time, the magnetic powder is preferably used in the form of powder, and the average particle diameter is 20 μm or less, preferably 10 μm or less, particularly preferably 5 μm or less.

  Taking samarium iron nitrogen as an example of the magnetic powder, particles having a spherical shape and having a particle size of 20 μm or less can be used, and those having a particle size in the range of 1 to 5 μm are preferred. When the particle size is 20 μm or more, when blended in the fiber, many yarn breaks occur during spinning, making industrial production difficult.

  In the mixing step, for example, a high-concentration masterbatch is produced by kneading and molding a thermoplastic elastomer raw material and magnetic powder with a twin-screw kneading extruder and the like so that the magnetic powder has a predetermined concentration during spinning. There are a method of diluting with a plastic elastomer raw material and a method of producing and spinning a compound containing a magnetic powder in a predetermined concentration. In the present invention, these methods can be used.

  When kneading the thermoplastic elastomer raw material and the magnetic powder, dispersibility is improved by adding various dispersants. Furthermore, in order to increase the adhesion between the raw material resin and the magnetic powder, a magnetic powder surface-treated with a silane coupling agent, a titanate coupling agent, a zirconium coupling agent, or the like can be used.

  The temperature at which the thermoplastic elastomer raw material is melted by heating varies depending on the type and properties of the thermoplastic elastomer, but can be easily mixed, for example, at 190 to 250 ° C.

  The blending ratio of the thermoplastic elastomer raw material and the magnetic powder varies depending on the combination of the thermoplastic elastomer raw material and the magnetic powder, but may be any ratio that has a predetermined surface magnetic flux density as the magnetized fiber, It is not specifically limited, It is 20 to 90 weight% with respect to a thermoplastic elastomer raw material, Preferably it is 30 to 80 weight%, Especially preferably, it is 40 to 70 weight%.

  Further, in the spinning step, spinning can be performed by a method used in spinning of a polymer material.

  Examples of the spinning method include a melt spinning method.

  When melt spinning, the thermoplastic elastomer raw material is heated and melted, and magnetic powder is added to and mixed with this to obtain a melt of the thermoplastic elastomer raw material and magnetic powder, or the thermoplastic elastomer raw material and magnetic material. The mixture is heated and melted while mixing and mixed to obtain the melt. Next, the melted material is extruded from the die into a fiber, cooled and solidified, whereby the magnetized fiber of the present invention can be produced.

  In the mixing step, for example, a high-concentration masterbatch is produced by kneading and forming a thermoplastic elastomer raw material and magnetic powder with a twin-screw kneading spinning machine, and heat is applied so that the magnetic substance has a predetermined concentration during spinning. There are a method of diluting with a raw material of a plastic elastomer, and a method of producing a thermoplastic elastomer compound containing a magnetic substance at a predetermined concentration and spinning the compound as it is.

  Cooling can be performed by a method such as air cooling or a liquid bath, and the cooling method may be selected depending on the settings of the type of raw material resin, fiber thickness, viscosity, and the like. Further, there is a method in which a polymer substance and magnetic powder are mixed with a twin-screw kneading extruder and extruded and spun as it is, and spinning may be performed by this method.

  The spinning speed may be 20 to 200 m / min, preferably 50 to 100 m / min, and the drawn fiber is continuously drawn after being wound or without being wound. In the stretching step, the spun magnetized fiber is subjected to a stretching process so that the fiber has an appropriate strength as the magnetized fiber. Stretching can be performed in a single stage or in multiple stages. Further, as a method for applying heat necessary for stretching into a filament shape, a known method such as roll heating, steam heating, hot liquid heating, or dry heat heating may be used.

  The stretching is preferably performed under the condition of 1.0 to 3 times.

  In the magnetizing process, the magnetized fiber is magnetized using a known device such as a magnetic circuit incorporating a permanent magnet, a continuous magnetic field generator such as an electromagnet, or an instantaneous magnetic field generator using an oil capacitor or a chemical capacitor. This can be done by magnetizing.

  In addition to the resin, components such as a smoothing agent and a colorant can be added to the fiber of the present invention.

  Examples of the smoothing agent include lithium stearate and calcium stearate.

  Furthermore, examples of the colorant include organic pigments and inorganic pigments commonly used or widely used in this technical field.

  The magnetized fiber of the present invention can be used as a single yarn, or several to several tens of single yarns can be used together. When the yarns are combined, the yarns may be combined by a known method such as twisted yarn or blade knitting, and the method is not particularly limited. However, the single yarns are preferably in close contact with each other and there is no gap between the single yarns. It is preferable. In the case of combining yarns, it is preferable to use a single yarn having a diameter of 0.1 mm to 2.0 mm so that the diameter after the combined yarn is 1.0 mm to 20 mm.

  When combining yarns, single yarns having a single diameter may be used, or a plurality of yarns having different single yarn diameters may be used. The combined yarn can be magnetized and processed to have a desired surface magnetic flux density.

  In the magnetized fiber of the present invention, the maximum spinnable content of the magnetic powder is approximately 80% by weight. The surface magnetic flux density becomes a magnetic fiber having a high magnetic force as the diameter of the magnetized fiber is increased. Since the surface hardness of the polyamide-based or polyester-based elastomer resin used in the present invention is 20 to 75 in Shore D hardness and the bending elastic modulus is 200 to 800 MPa, the Young's modulus is 1.0 to 10 cN even when the magnetic yarn is formed. / Dtx flexible yarn.

  Since nylon 12 resin has, for example, Rockwell hardness R108 and flexural modulus of 1200 MPa, the magnetized fiber of the present invention is a softer magnetic fiber than nylon 12 resin, but has a magnetic force with a surface magnetic flux density of 15 millitesla or more. In order to achieve this, even if 80% by weight of magnetic powder is contained, the fine diameter is required to be 1.0 mm or more. If a single yarn has a diameter of 1.0 mm, since the yarn is thick and hard, only limited fabrics can be produced. In such a case, for example, if five 0.2 mm diameter magnetic yarns are twisted together, the equivalent of a 1.0 mm diameter is obtained. Since the twisted magnetic yarn is much softer than the single yarn 1.0 mm diameter magnetic yarn, weaving and knitting becomes easy and various fabrics can be manufactured.

  The tensile break strength of the polyamide-based or polyester-based elastomer resin is 20 to 50 MPa, and the strength of the magnetic yarn is relatively easily obtained at 0.4 cN / dtx or more. If it is a twisted yarn of magnetic yarn having a diameter of 0.1 mm to 0.5 mm, there is no problem in the knitting processability and the physical properties of the product fabric.

  In the present invention, when a magnetic yarn having a surface magnetic flux density of 15 millitesla or more and having a diameter of 1.0 mm or more is obtained, the thermoplastic elastomer used is at least one of an olefin elastomer, a styrene elastomer, and a urethane elastomer. Seeds can be used. The characteristics of the olefin-based elastomer, styrene-based elastomer, and urethane-based elastomer resin are 40 to 90 in terms of surface hardness Shore A hardness and 20 to 100 MPa in flexural modulus, which is a very soft resin.

  Therefore, even a 1.0 mm diameter magnetic yarn is a very soft magnetic yarn. Since it is a soft magnetic yarn, it is possible to produce a woven or knitted fabric with a single yarn. Furthermore, even if a magnetic yarn having a diameter of 1.0 to 5.0 mm is twisted, there is no gap between the yarns, and the entire yarn is magnetized as a single yarn. A twisted magnetic yarn is obtained.

  Since the tensile breaking strength of these resins is 3 to 15 MPa, the absolute strength of the magnetic yarn is insufficient when the diameter is 0.5 mm or less when the magnetic yarn is used. There are no problems in workability, knitting workability and physical properties of commercial fabrics.

  The magnetized fiber of the present invention can be a twisted yarn, braid, woven fabric, knitted fabric, non-woven fabric, or other fabric. The cloth may be mixed with other non-magnetic fibers or magnetic fibers to form a cloth. When mixed, covering, mixed fiber, combined yarn, twisted yarn may be used, and then woven or knitted. Any other means may be used, in which fibers and non-magnetic fibers may be alternately woven or knitted one by one, or 1: 3. Further, the fabric can be subjected to processing such as dyeing and resin processing as needed, and can be used for the intended use. Dyeing can be performed in the form of fibers, fabrics, and intended tools.

  When the magnetic fiber is in contact with the adjacent magnetic fiber, the magnetic fiber fabric is attracted by the magnetic force at the portion magnetized in the south pole and the portion magnetized in the adjacent north pole, and is neutralized to weaken the magnetic force. In the case of a knitted fabric or a woven fabric so that the magnetic fibers are not adsorbed, it is preferable to perform knitting by aligning with the non-magnetic yarn. When a knitting machine having a plurality of yarn feeders is used, it is preferable to perform knitting so that one or several magnetic yarns are alternately arranged between the magnetic yarn and the non-magnetic yarn.

  The fabric can be used as a material for medical devices such as a magnetic band, a magnetic bed, a magnetic supporter, a magnetic shirt, and a magnetic loop.

  Furthermore, the fabric is corset, arm / knee support, belly band, leg warmer, neck warmer, sports undershirt, socks and underwear. It can be used as a material for clothing such as pants, bedding such as sheets, pillow covers, blankets, futons, cushions, mattresses, and vehicle articles such as vehicle seats and cushion rugs.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited only to these examples.
In the following examples, the surface magnetic flux density and the elongation recovery rate were measured as follows.

<Measurement method of surface magnetic flux density>
With a measurement condition of a measuring range of 0 to 200 millitesla and a resolution of 0.1 millitesla with a Teslameter TM-801 manufactured by KANETEC, the sensor unit was brought into contact with the central portion of the magnetized fiber cut to a length of 10 cm, The magnetized fiber was rotated in the circumferential direction, and the maximum surface magnetic flux density (millitesla) in the circumferential direction was measured. A 1 m long magnetized fiber was cut every 10 cm, the cut 10 cm long magnetized fiber was measured as described above, and an arithmetic average value was obtained from a total of 10 measured values to obtain a surface magnetic flux density. .

<Measurement method of elongation recovery rate>
Using a constant speed extension type tensile tester, a sample length of 20 cm and an initial load of 0.08826 cN per 1 dtx are applied at a gripping interval of 20 cm, and a tensile speed of 20 cm / min is stretched to 10% or 20%. Immediately, it was deweighted at the same speed. Immediately after complete dewetting, the film was stretched to the initial load, and the recovery elongation at that time was defined as L, which was defined as the elongation recovery rate.
Elongation recovery rate (%) = ((20− (L−20)) / 20) × 100

(Examples 1-3)
Magnetic powder of samarium iron nitrogen with a mean particle diameter of 2-3 μm (trade name, MELLMAX S1, manufactured by Sumitomo Metal Mining Co., Ltd.) and polyamide elastomer “Uvesta Expa” (registered trademark, manufactured by Ube Industries) 9055F1 And a polyamide elastomer resin compound containing 65 wt% of the magnetic powder.

  Using this compound, melt spinning was performed using an extruder-type spinning device. The extruder polymer was melted at a temperature of 210 ° C and spun by a spin pack heated to 210 ° C. 0.1mm diameter fiber is extruded using 0.8mm spinneret, 0.20mm diameter fiber is extruded using 1.0mm spinneret, 0.28mm diameter fiber is extruded using 1.2mm spinneret, The undrawn yarn was obtained by cooling in a cooling bath at 20 ° C.

  Without winding up the undrawn yarn, the first stage drawing was performed 2.5 times in a warm water bath at 80 ° C., and then passed through a 125 ° C. dry heat bath so that the total draw ratio was 2.6 times. Then, it was stretched in the second stage and further passed through a dry heat bath at 125 ° C. and subjected to 3% relaxation heat treatment to obtain fibers having diameters of 0.15 mm, 0.20 mm, and 0.28 mm. The spinning condition was able to be spun without problems with no yarn breakage.

  The obtained fiber was wound around a bobbin that can be attached to a magnetized coil using a magnetizer (device name: condenser-type magnetizer MAG-3540, manufactured by Toyo Magnetic Industry Co., Ltd.). It was mounted in a 100 mmH magnetizing coil and applied with an applied voltage of 3900 V and 4000 μF to magnetize it in the fiber diameter direction. As shown in Table 1, in Examples 1 to 3, a magnetized fiber having a low Young's modulus, a flexible, high elongation, stretch property, and a good elongation recovery rate was obtained.

(Examples 4 to 5)
For bonded magnets, 89% by weight of nylon 12 resin is blended with polyamide elastomer “Uvesta Expa” (registered trademark, manufactured by Ube Industries Co., Ltd.) 9055F1 and magnetic powder of samarium iron nitrogen with an average particle diameter of 2 to 3 μm. A resin (trade name, MELLMAX S3A-10M, manufactured by Sumitomo Metal Mining Co., Ltd.) was blended 60%, and melt spinning was performed using an extruder spinning apparatus. The extruder polymer was melted at a temperature of 210 ° C and spun by a spin pack heated to 210 ° C.

  0.5mm diameter fiber uses 1.8mm spout, 1.0mm diameter fiber uses 4.0mm spout and is extruded from the spinning hole, and the spun yarn is cooled in a cooling bath at 20 ° C. An undrawn yarn was obtained. Without winding up this undrawn yarn, it was first stretched 2.0 times in a warm water bath at 80 ° C. and then passed through a 125 ° C. dry heat bath so that the total draw ratio was 2.3 times. Then, the film was stretched in the second stage, and further passed through a 125 ° C. dry heat bath and subjected to a 3% relaxation heat treatment to obtain fibers having diameters of 0.5 mm and 1.0 mm. The spinning condition was able to be spun without problems with no yarn breakage.

  The obtained fiber was magnetized in the same manner as in Examples 1 to 3. As shown in Table 1, in Examples 4 and 5, a magnetized fiber having a low Young's modulus, a high elongation, a stretch property, and a good elongation recovery rate was obtained.

(Example 6)
60 parts of bonded magnet resin (trade name, MELLMAX S5, manufactured by Sumitomo Metal Mining Co., Ltd.) in which magnet powder of samarium iron nitrogen and neodymium iron boron is blended in nylon 12 resin as magnetic powder and polyamide elastomer “Uvesta Expa” ( (Registered trademark, manufactured by Ube Industries, Ltd.) 9055F1 was blended with 40 parts, and melt spinning was performed using an extruder spinning apparatus. The polymer of the extruder was melted at a temperature of 220 ° C. and spun by a spin pack heated to 220 ° C. The spinneret was extruded from a spinning hole having a diameter of 1.2 mm, and the spun yarn was cooled in a cooling bath at 20 ° C. to obtain an undrawn yarn.

  Without winding up the undrawn yarn, it is first-stage drawn 2.7 times in a warm water bath at 80 ° C., and then passed through a 130 ° C. dry heat bath so that the total draw ratio becomes 2.8 times. Then, the fiber was stretched in the second stage, further passed through a 130 ° C. dry heat bath, and subjected to 3% relaxation heat treatment to obtain a fiber having a diameter of 0.31 mm. The spinning condition was able to be spun without problems with no yarn breakage. The obtained fiber was magnetized in the same manner as in Examples 1 to 3. As shown in Table 1, in Example 6, a magnetized fiber having a low Young's modulus, flexibility, high elongation, stretchability, and good elongation recovery rate was obtained.

(Example 7)
A warp nylon 20 dtx monofilament having a warp density of 60 yarns / inch, exposed to weft yarn, cotton No. 80 twin yarn, and magnetized 0.20 mm monofilament fiber of Example 2 alternately with a weave density of 70 weft density / inch A plain fabric was prepared. There was no problem in weaving and a flexible magnetic fabric was obtained.

(Example 8)
Using a 6 gauge sock knitting machine (manufactured by Nagata Seiki Co., Ltd.) with a 4.75 inch hook diameter, a nylon processed yarn of 56 dtx double yarn as the back yarn and two 20/2 cotton combed yarns as the front yarn and examples A supporter knitted fabric for foot knees having a length of 50 cm was prepared by aligning 1 magnetized 0.15 mm monofilament fibers. The knitting was knitted without problems.

  This supporter knitted fabric was repeated for about 2 months by repeating the action of wearing and washing for 20 weeks with a calf and knee pain going to an osteopathic clinic from waking up to sleeping for a week. Most of the impressions were that it was a supporter with a good feeling of use even when worn for a long time. Moreover, even when worn for 2 months and repeated washing, the knitted fabric was not deformed and was excellent in durability. Fifteen of the 20 patients were warm and had no cold feet, and were found to reduce pain in the calves and knees.

(Comparative Example 1)
Resin for bonded magnet (trade name, MELLMAX 3), in which 89% nylon 12 resin is blended with Nylon 12 Daiamide L1901 (manufactured by Daicel Eponic Co., Ltd.) and magnetic powder of samarium iron nitrogen with an average particle size of 2 to 3 μm as magnetic powder. , Manufactured by Sumitomo Metal Mining Co., Ltd.) was blended 60% to obtain a fiber having a diameter of 0.20 mm under the same conditions as in Example 2. The obtained fiber was magnetized with a magnetizer in the same manner as in Example 1. As shown in Table 1, the properties of the obtained magnetized fiber were hard fibers with low elongation, high Young's modulus, and poor stretch recovery rate.

(result)
The results are as shown in Table 1.

Example 9
Three 0.5 mm diameter yarns having a surface magnetic flux density of 5.0 millitesla obtained in Example 4 were aligned using a ring twisting machine, and S-twisted 220 t / m. The three twisted yarns were combined as an upper twist and Z-twisted 150 t / m to obtain a twisted yarn in which nine 0.5 mm diameter yarns were combined. As a result of observing the twisted state of this twisted yarn with a microscope (75 magnifications), there was no gap between the yarns.

  This twisted yarn was wound around a bobbin that can be attached to a magnetized coil using a magnetizer (device name: condenser-type magnetizer MAG-3540, manufactured by Toyo Magnetic Industry Co., Ltd.). It was mounted in a 100 mmH magnetizing coil and applied with a voltage of 3900 V and 4000 μF to magnetize it in the fiber diameter direction. When the surface magnetic flux density of a yarn obtained by twisting nine magnetized 0.5 mm diameter yarns was measured, a twisted yarn having a high surface magnetic flux density of 38.7 millitesla was obtained. Since this magnetized synthetic yarn has a high surface magnetic flux density and is a soft magnetized fiber, it is a magnetized fiber that can be worn without any discomfort even if it is a neck loop product.

(Reference example)
The 1.0 mm diameter fiber having a surface magnetic flux density of 13.12 mT obtained in Example 5 was subjected to S twisting 150 t / m as a two-ply twisting with a ring twisting machine. The three twisted yarns were combined into a top twist and Z-twisted at 95 t / m to obtain a twisted yarn in which six 1.0 mm diameter fibers were combined. This twisted yarn was wound around a bobbin that can be attached to a magnetized coil using a magnetizer (device name: condenser-type magnetizer MAG-3540, manufactured by Toyo Magnetic Industry Co., Ltd.). It was mounted in a 100 mmH magnetizing coil and applied with a voltage of 3900 V and 4000 μF to magnetize it in the fiber diameter direction.

  When the surface magnetic flux density of a twisted yarn obtained by twisting six magnetized 1.0 mm diameter fibers was measured, the magnetic force was 12.5 millitesla, which was lower than the surface magnetic flux density of the original yarn of 1.0 mm diameter fibers. The value is shown. When the twisted state of the twisted yarn was observed with a microscope (75 times magnification), a gap was observed between the yarns. This indicates that when the fiber diameter is increased to 1.0 mm, the bending rigidity is increased, and the number of twisted yarns that eliminate gaps between the yarns cannot be applied. The density is low.

(Examples 10 to 13)
Magnetic powder of samarium iron nitrogen with an average particle diameter of 2 to 3 μm (trade name, MELLMAX S1, manufactured by Sumitomo Metal Mining Co., Ltd.) and polyester elastomer “Hytrel” (registered trademark, manufactured by Toray Deyupon Co., Ltd.) 5557 as magnetic powders A polyester elastomer resin compound containing 60 wt% of the magnetic powder was produced using a twin screw extruder.

  Using this compound, melt spinning was performed using an extruder-type spinning device. The polymer of the extruder was melted at a temperature of 220 ° C. and spun by a spin pack heated to 220 ° C. 0.16mm diameter fiber uses 0.8mm spout, 0.22mm diameter fiber uses 1.0mm spout, 0.32mm diameter fiber uses 1.2mm spout, 0.5mm diameter fiber Was extruded using a 1.8 mm diameter nozzle, and the spun yarn was cooled in a cooling bath at 30 ° C. to obtain an undrawn yarn.

  Without winding up the undrawn yarn, the first stage drawing was performed 2.5 times in a warm water bath at 70 ° C., and then passed through a 140 ° C. dry heat bath so that the total draw ratio was 2.6 times. Then, the fiber was stretched in the second stage and further passed through a dry heat bath at 140 ° C. and subjected to 3% relaxation heat treatment to obtain fibers having diameters of 0.16 mm, 0.22 mm, 0.32 mm, and 0.50 mm. The spinning condition was able to be spun without problems with no yarn breakage.

  The obtained fiber was wound around a bobbin that can be attached to a magnetized coil using a magnetizer (device name: condenser-type magnetizer MAG-3540, manufactured by Toyo Magnetic Industry Co., Ltd.). It was mounted in a 100 mmH magnetizing coil and applied with a voltage of 3900 V and 4000 μF to magnetize it in the fiber diameter direction. As shown in Table 2, in Examples 10 to 13, magnetized fibers having low Young's modulus, soft, high elongation, stretchability, and good elongation recovery rate were obtained.

Hereinafter, examples using other types of resins will be described.
(Example 14)
Magnetic powder of samarium iron nitrogen with a mean particle size of 2-3 μm (trade name, MELLMAX S1, manufactured by Sumitomo Metal Mining Co., Ltd.) as a magnetic powder, polystyrene elastomer “Lavalon” (registered trademark, manufactured by Mitsubishi Chemical Corporation) SJ9400, Using a twin screw extruder, a polystyrene elastomer resin compound containing 65 wt% of the magnetic powder was produced. Using this compound, melt spinning was performed using an extruder-type spinning device. The extruder polymer was melted at a temperature of 190 ° C and spun by a spin pack heated to 190 ° C. The spinneret was extruded from a spinning hole having a diameter of 1.2 mm, and the spun yarn was cooled in a cooling bath at 30 ° C. to obtain an undrawn yarn.

  Without winding up the undrawn yarn, the first stage drawing was performed 1.2 times in a warm water bath at 80 ° C., and then passed through a 125 ° C. dry heat bath so that the total draw ratio was 1.3 times. The fiber was stretched in the second stage while being processed to obtain a fiber having a diameter of 0.5 mm. The spinning condition was able to be spun without problems with no yarn breakage. The obtained fiber was wound around a bobbin that can be attached to a magnetized coil using a magnetizer (device name: condenser-type magnetizer MAG-3540, manufactured by Toyo Magnetic Industry Co., Ltd.). It was mounted in a 100 mmH magnetizing coil and applied with an applied voltage of 3900 V and 4000 μF to magnetize it in the fiber diameter direction.

  The obtained magnetized fiber has a 0.5 mm diameter surface magnetic flux density of 5.7 millitesla, a breaking elongation of 220%, a 20% elongation recovery rate of 100%, a Young's modulus of 0.61, and is very soft, A magnetized fiber having high elongation, stretchability and good elongation recovery rate was obtained.

(Example 15)
Three yarns having a surface magnetic flux density of 5.7 millitesla obtained in Example 14 and having a diameter of 0.5 mm were aligned by a ring twisting machine, and S-twisting was performed at 200 t / m. The three twisted yarns were combined as an upper twist and Z-twisted 150 t / m to obtain a twisted yarn in which nine 0.5 mm diameter yarns were combined. As a result of observing the twisted state of the combined combustion yarn with a microscope (75 times magnification), there was no gap between the yarns.

  This twisted yarn was wound around a bobbin that can be attached to a magnetized coil using a magnetizer (device name: condenser-type magnetizer MAG-3540, manufactured by Toyo Magnetic Industry Co., Ltd.). It was mounted in a 100 mmH magnetizing coil and applied with a voltage of 3900 V and 4000 μF to magnetize it in the fiber diameter direction. When the surface magnetic flux density of a yarn in which nine magnetized 0.5 mm diameter yarns were twisted was measured, a twisted yarn having a high surface magnetic flux density of 38.2 millitesla was obtained. Since this magnetized synthetic yarn has a high surface magnetic flux density and is a soft magnetized fiber, it was a magnetized fiber that can be worn without discomfort even if it is a neck loop product.

(Example 16)
Magnetic powder of samarium iron nitrogen having an average particle diameter of 2 to 3 μm as magnetic powder (trade name, MELLMAX S1, manufactured by Sumitomo Metal Mining Co., Ltd.), polyolefin elastomer “Tuffmer” (registered trademark, manufactured by Mitsui Chemicals) 2060, Using a twin screw extruder, a polyolefin elastomer resin compound containing 65 wt% of the magnetic powder was produced. Using this compound, melt spinning was performed using an extruder-type spinning device. The extruder polymer was melted at a temperature of 190 ° C and spun by a spin pack heated to 190 ° C. The spinneret was extruded from a spinning hole having a diameter of 4.0 mm, and the spun yarn was cooled in a cooling bath at 30 ° C. to obtain an undrawn yarn.

  Without winding this unstretched yarn, it was first stretched 1.1 times in a warm water bath at 70 ° C., and then. The fiber was dried at a constant speed in a dry heat bath at 100 ° C. to obtain a fiber having a diameter of 3.2 m. The spinning condition was able to be spun without problems with no yarn breakage. The obtained fiber was wound around a bobbin that can be attached to a magnetized coil using a magnetizer (device name: condenser-type magnetizer MAG-3540, manufactured by Toyo Magnetic Industry Co., Ltd.). It was mounted in a 100 mmH magnetizing coil and applied with an applied voltage of 3900 V and 4000 μF to magnetize it in the fiber diameter direction.

  The obtained magnetized fiber has a surface magnetic flux density of 3.2 mm in diameter, 28.7 millitesla, a breaking elongation of 220%, a 20% elongation recovery rate of 100%, a Young's modulus of 0.25 cN / dtx, A magnetized fiber having high elongation, stretchability and good elongation recovery rate was obtained. Since the surface magnetic flux density is high and it is a soft magnetized fiber, it is a magnetized fiber that can be worn without discomfort even if it is a neck loop product as it is.

(Example 17)
Magnetic powder of samarium iron nitrogen with an average particle diameter of 2 to 3 μm as magnetic powder (trade name, MELLMAX S1, manufactured by Sumitomo Metal Mining Co., Ltd.) and polyurethane elastomer “Rezamin” (registered trademark: manufactured by Dainichi Seika Kogyo Co., Ltd.) A polyurethane elastomer resin compound containing 50 wt% of the magnetic powder was manufactured using P-890 with a twin screw extruder. Using this compound, melt spinning was performed using an extruder-type spinning device. The polymer of the extruder was melted at a temperature of 200 ° C. and spun by a spin pack heated to 200 ° C. The spinneret was extruded from a spinning hole having a diameter of 1.8 mm, and the spun yarn was cooled in a cooling bath at 40 ° C. to obtain an undrawn yarn.

  Without winding up this undrawn yarn, it was first-stage drawn 1.1 times in a hot water bath at 60 ° C. and then dried while passing through a dry heat bath at 100 ° C. to obtain a fiber having a diameter of 1.1 mm Got. The spinning condition was able to be spun without problems with no yarn breakage. The obtained fiber was wound around a bobbin that can be attached to a magnetized coil using a magnetizer (device name: condenser-type magnetizer MAG-3540, manufactured by Toyo Magnetic Industry Co., Ltd.). It was mounted in a 100 mmH magnetizing coil and applied with an applied voltage of 3900 V and 4000 μF to magnetize it in the fiber diameter direction.

  The obtained magnetized fiber having a diameter of 1.1 mm has a surface magnetic flux density of 12.7 millitesla, a breaking elongation of 250%, a 20% elongation recovery rate of 100%, a Young's modulus of 0.21 cN / dtx, and is soft and high. A magnetized fiber having stretchability and good elongation recovery rate was obtained.

Claims (7)

  A magnetized fiber comprising a thermoplastic elastomer and rare earth magnetic powder and having a surface magnetic flux density of 0.50 millitesla or more.   The diameter is 0.1 mm to 2.0 mm, the breaking strength is 0.4 cN / dtx or more, the breaking elongation is 40 to 120%, the 10% elongation recovery rate is 70% or more, and the Young's modulus is 1.0 to 2. The magnetized fiber according to claim 1, wherein the temperature is 10 cN / dtx and the thermoplastic elastomer is at least one of a polyamide-based elastomer and a polyester-based elastomer.   Thermoplastic elastomer having a diameter of 0.5 mm to 5.0 mm, a breaking elongation of 100 to 300%, a 20% elongation recovery rate of 80% or more, a Young's modulus of 0.1 to 5.0 cN / dtx The magnetized fiber according to claim 1, wherein at least one of an olefin elastomer, a styrene elastomer, and a urethane elastomer is used. Rare earth magnetic powder is samarium-cobalt magnet (SmCo _2-17 ), samarium-iron-nitrogen magnet (SmFeN), samarium-zirconium-iron-cobalt-boron-nitrogen magnet (SmZrFeCoBN), neodymium-iron-boron magnet (NdFeB). 4) and at least one kind of bonded magnet containing these magnetic powders. 4. The magnetized fiber according to any one of claims 1 to 3.   5. A twisted yarn of a magnetized fiber comprising the magnetized fiber according to claim 1, wherein the twisted yarn has a diameter of 1.0 mm to 20 mm.   A magnetized fabric comprising the magnetized fiber according to any one of claims 1 to 4. A mixing step of mixing the thermoplastic elastomer raw material and the rare earth magnetic powder in a fluidized state;
A spinning step of spinning a mixture of the thermoplastic elastomer raw material and the rare earth magnetic powder mixed in the mixing step;
And a drawing step of drawing the fiber obtained in the spinning step.