WO2021106843A1 - 糸および布帛 - Google Patents

糸および布帛 Download PDF

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Publication number
WO2021106843A1
WO2021106843A1 PCT/JP2020/043599 JP2020043599W WO2021106843A1 WO 2021106843 A1 WO2021106843 A1 WO 2021106843A1 JP 2020043599 W JP2020043599 W JP 2020043599W WO 2021106843 A1 WO2021106843 A1 WO 2021106843A1
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WO
WIPO (PCT)
Prior art keywords
thread
yarn
piezoelectric
potential
surfactant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/043599
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English (en)
French (fr)
Japanese (ja)
Inventor
辻　雅之
貴子 西浦
英治 田口
宏和 林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP2021561407A priority Critical patent/JP7131715B2/ja
Priority to CN202090000982.3U priority patent/CN219342438U/zh
Publication of WO2021106843A1 publication Critical patent/WO2021106843A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made

Definitions

  • the present invention relates to a yarn provided with a potential generating fiber that generates an electric potential by energy from the outside, and a fabric provided with the yarn.
  • Patent Document 1 discloses a piezoelectric thread that generates an electric potential by external energy.
  • an object of the present invention is to provide a thread and a fabric that suppress the disappearance of an electric field more than before.
  • the thread of the present invention includes a plurality of electric potential generating fibers that generate electric potentials by energy from the outside, and a surfactant that adheres to the plurality of electric potential generating fibers. Further, the yarn is characterized in that the adhesion mode of the surfactant is not uniform.
  • Surfactant improves the wettability of the thread surface. Moisture spreads wet on the surface of the yarn and easily evaporates. In particular, when the adhesion mode of the surfactant is not uniform, the moisture is more likely to get wet and spread on the surface of the yarn than when it is uniform. Therefore, it becomes difficult for water to intervene between the plurality of potential generating fibers. Therefore, the thread of the present invention can easily maintain an electric field.
  • the thread of the present invention can suppress the disappearance of the electric field more than before.
  • FIG. 1 (A) is a diagram showing the configuration of the thread 1
  • FIG. 1 (B) is a cross-sectional view taken along the line AA of FIG. 1 (A).
  • 2 (A) and 2 (B) are views showing the relationship between the uniaxial stretching direction of polylactic acid, the electric field direction, and the deformation of the piezoelectric fiber 10.
  • FIG. 3 is a diagram showing the configuration of the thread 2. It is a figure which shows the electric field in the thread 1 and the thread 2. It is a simulation result which shows the relationship between the amount of a surfactant and the water content after a lapse of a predetermined time. It is sectional drawing of the thread 1A which concerns on the modification. It is a figure which shows the cloth 75.
  • FIG. 1 (A) is a partially exploded view showing the configuration of the thread 1
  • FIG. 1 (B) is a cross-sectional view taken along the line AA of FIG. 1 (A).
  • the yarn 1 is a multifilament yarn in which a plurality of piezoelectric fibers 10 are twisted. Further, the thread 1 has a surfactant 100 attached to the plurality of piezoelectric fibers 10.
  • the piezoelectric fiber 10 is a fiber having a circular cross section.
  • the yarn 1 is a left-handed swirl yarn (hereinafter, referred to as S yarn) in which a plurality of piezoelectric fibers 10 are swiveled to the left and twisted.
  • S yarn left-handed swirl yarn
  • the yarn 1 in which seven piezoelectric fibers 10 are twisted is shown, but the number of twists is actually set as appropriate in consideration of the intended use and the like.
  • the piezoelectric fiber 10 is made of, for example, a piezoelectric polymer.
  • the piezoelectric fiber 10 is manufactured, for example, by a method of extruding a piezoelectric polymer into fibers.
  • the piezoelectric fiber 10 is a method of melt-spinning a piezoelectric polymer into fibers (for example, a spinning / drawing method in which a spinning step and a drawing step are performed separately, a direct drawing method in which a spinning step and a drawing step are connected, and false twisting.
  • the POY-DTY method which can be performed at the same time, or the ultra-high-speed spinning method for high speed, etc.), dry or wet spinning of piezoelectric polymers (for example, by dissolving the raw material polymer in a solvent)
  • the cross-sectional shape of the piezoelectric fiber 10 is not limited to a circular shape.
  • Piezoelectric polymers include those having pyroelectricity and those not having pyroelectricity.
  • the piezoelectric fiber 10 of the present embodiment may or may not have pyroelectricity.
  • PVDF polyvinylidene fluoride
  • Pyroelectric piezoelectric polymers such as PVDF also generate potentials due to the thermal energy of the human body. In this case, the heat energy of the human body is the energy from the outside.
  • Polylactic acid is a piezoelectric polymer that does not have pyroelectricity. Polylactic acid is uniaxially stretched to produce piezoelectricity. Polylactic acid includes PLLA having a right-handed helical structure in which an L-form monomer is polymerized, and PDLA having a left-handed helical structure in which a D-monomer is polymerized and having a piezoelectric constant polarity opposite to that of PLLA.
  • FIGS. 2 (A) and 2 (B) show the uniaxially stretched direction, the electric field direction, and the piezoelectric fiber 10 of the thread 1 in the case where the piezoelectric fiber 10 is uniaxially stretched L-form polylactic acid. It is a figure which shows the relationship with the deformation of. Note that FIGS. 2 (A) and 2 (B) are views when the piezoelectric fiber 10 is assumed to have a film shape as a model case.
  • Polylactic acid is a chiral polymer, and its main chain has a spiral structure. Polylactic acid exhibits piezoelectricity when it is uniaxially stretched and the molecules are oriented. Further heat treatment is applied to increase the crystallinity, thereby increasing the piezoelectric constant.
  • the uniaxially stretched piezoelectric fiber 10 made of polylactic acid is defined as the first axis in the thickness direction, the third axis in the stretching direction 900, and the second axis in the direction orthogonal to both the first axis and the third axis. It has tensor components of d 14 and d 25 as piezoelectric strain constants. Therefore, the piezoelectric fiber 10 made of uniaxially stretched polylactic acid generates an electric potential when strain occurs in the direction of 45 degrees with respect to the uniaxially stretched direction.
  • the piezoelectric fiber 10 contracts in the direction of the first diagonal line 910A and extends in the direction of the second diagonal line 910B orthogonal to the first diagonal line 910A, in the direction from the back side to the front side of the paper surface. Generates an electric field. That is, the piezoelectric fiber 10 generates a negative potential on the front side of the paper surface. As shown in FIG. 2B, the piezoelectric fiber 10 also generates an electric potential when it extends in the direction of the first diagonal line 910A and contracts in the direction of the second diagonal line 910B, but the polarity is reversed and the surface of the paper surface. An electric field is generated in the direction from to the back side. That is, the piezoelectric fiber 10 generates a positive potential on the front side of the paper surface.
  • Polylactic acid does not need to be polled like other piezoelectric polymers such as PVDF or piezoelectric ceramics because piezoelectricity is generated by the orientation of molecules due to stretching.
  • the piezoelectric constant of uniaxially stretched polylactic acid is about 5 to 30 pC / N, and has a very high piezoelectric constant among polymers. Furthermore, the piezoelectric constant of polylactic acid does not fluctuate with time and is extremely stable.
  • each piezoelectric fiber 10 having the above properties is applied to the thread 1 of FIG. 1 (A)
  • the stretching direction 900 of each piezoelectric fiber 10 coincides with the axial direction of each piezoelectric fiber 10.
  • the drawing direction 900 of the piezoelectric fibers 10 is tilted 45 degrees to the left on the paper surface with respect to the axial direction of the yarn 1.
  • the piezoelectric fiber 10 When the thread 1 which is such an S thread is stretched by applying an axial tension, the piezoelectric fiber 10 stretches along the axial direction of the thread 1 and contracts along the width direction of the thread 1.
  • the axial direction of the thread 1 corresponds to the second diagonal line 910B in the example of FIG. 2A.
  • the piezoelectric fiber 10 contracts in the direction corresponding to the first diagonal line 910A and extends in the direction corresponding to the second diagonal line 910B, as in the example shown in FIG. 2 (A). Therefore, a negative potential is generated on the surface of the piezoelectric fiber 10, and a positive potential is generated on the inside. That is, the piezoelectric fiber 10 generates an electric potential by energy from the outside.
  • the inclination of the thread 1 with respect to the axial direction is not limited to 45 degrees to the left.
  • the drawing direction 900 may intersect at least with respect to the axial direction of the yarn 1. That is, the drawing direction 900 of the piezoelectric fiber 10 may be greater than 0 degrees and less than 90 degrees to the left with respect to the axial direction of the yarn.
  • FIG. 3 is a partially exploded view showing the yarn 2 constituting the right-handed swivel yarn (hereinafter referred to as Z yarn) twisted by swirling the piezoelectric fiber 10 to the right.
  • the thread 2 is a Z thread.
  • the drawing direction 900 of the piezoelectric fibers 10 is tilted 45 degrees to the right on the paper surface with respect to the axial direction of the yarn 2.
  • the piezoelectric fiber 10 When the Z thread 2 is stretched by applying tension, the piezoelectric fiber 10 stretches along the axial direction of the thread 2 and contracts along the width direction of the thread 2.
  • the axial direction of the thread 2 corresponds to the first diagonal line 910A in the example of FIG. 2B.
  • the piezoelectric fiber 10 extends in the direction corresponding to the first diagonal line 910A and contracts in the direction corresponding to the second diagonal line 910B, as in the example shown in FIG. 2 (B). Therefore, a positive potential is generated on the surface of the piezoelectric fiber 10, and a negative potential is generated on the inside. That is, the piezoelectric fiber 10 generates an electric potential by energy from the outside.
  • the inclination of the thread 2 with respect to the axial direction is not limited to 45 degrees to the right, as long as it intersects at least the axial direction of the thread 2. Good. That is, the stretching direction 900 of the piezoelectric fiber 10 may be greater than 0 degrees and less than 90 degrees to the right with respect to the axial direction of the yarn 2.
  • FIG. 4 is a cross-sectional view showing the state of the electric field in the thread 1 and the thread 2.
  • the thread 1 alone has a negative potential on the surface and a positive potential inside when an axial tension is applied.
  • the thread 2 alone when an axial tension is applied, the surface becomes a positive potential and the inside becomes a negative potential.
  • an electric field is mainly formed from the inside to the outside of the thread 1
  • an electric field is mainly formed from the outside to the inside.
  • these electric fields leak into the air and are synthesized, and the electric field is formed between the yarn 1 and the yarn 2 due to the potential difference between the yarn 1 and the yarn 2.
  • an electric field is generated between the thread 1 and the object close to the thread 1.
  • an electric field is generated between the thread 2 and the object close to the thread 2.
  • the thread 1 and the thread 2 do not have to have potentials having opposite polarities to each other. Even when the thread 1 and the thread 2 have potentials of the same polarity, an electric field is generated if there is a potential difference between them. That is, the thread 1 and the thread 2 may have different potentials when the potential is generated.
  • Such an electric field can suppress the growth of, for example, bacteria, fungi, archaea, or microorganisms such as mites and fleas.
  • the thread 1 or the thread 2 contains water containing an electrolyte
  • an electric current flows through the water.
  • the potential generated in the thread 1 or the thread 2 disappears.
  • the electric potential disappears, so does the electric field.
  • the thread 1 or thread 2 of the present embodiment has a surfactant 100 attached to a plurality of piezoelectric fibers 10.
  • the surfactant 100 may be ionic (cationic / anionic / zwitterionic) or nonionic (nonionic). Further, the surfactant 100 may be a small molecule or a polymer.
  • the surfactant 100 is, for example, an oil agent used in the fiber manufacturing process. When the user washes clothes containing thread 1 (or thread 2), the oil agent may be removed, but a laundry finishing agent (softener) may be attached instead. This softener is also an example of the surfactant 100.
  • the surfactant 100 improves the wettability of the surface of the piezoelectric fiber 10. Therefore, the water wets and spreads on the surface of the piezoelectric fiber 10. Moisture is exposed to the outside of the yarn by wetting and spreading on the fiber surface. Therefore, the moisture is more likely to evaporate and dries faster than when no surfactant is attached.
  • FIG. 5 is a simulation result showing the relationship between the amount of the surfactant and the water content after a lapse of a predetermined time. As shown in FIG. 5, as the amount of the surfactant increases, the water content after a lapse of a predetermined time decreases. That is, the larger the amount of the surfactant, the easier it is for the water to evaporate.
  • the mode of attachment of the surfactant 100 to the plurality of piezoelectric fibers 10 in the present embodiment is not uniform. That is, the thread 1 (or thread 2) has a piezoelectric fiber 10 having a large amount of the surfactant 100 attached and a piezoelectric fiber 10 having a small amount of the surfactant 100 attached. More specifically, the surfactant 100 adhered by the piezoelectric fiber 10 arranged on the outside of the thread 1 (or thread 2) and the piezoelectric fiber 10 arranged on the inside of the thread 1 (or thread 2). The amount is different. For example, in the example of FIG. 1B, the amount of the surfactant 100 adhering to the piezoelectric fiber 10 arranged on the outside is larger than the amount of the surfactant 100 adhering to the piezoelectric fiber 10 arranged on the inside. ..
  • Thread 1 (or thread 2) is a multifilament thread. Therefore, the thread 1 or the thread 2 contains a large amount of surfactant inside. Therefore, a large amount of water is drawn into the thread 1 or the thread 2. Moisture drawn in is not exposed to the outside, so it is harder to dry than moisture that has spread to the outside. Since the thread 1 or the thread 2 also contains a surfactant on the outside, the thread 1 or the thread 2 is in a wet state as a whole.
  • the mode of attachment of the surfactant 100 to the plurality of piezoelectric fibers 10 is not uniform, the wetting and spreading of water is biased.
  • the amount of the surfactant 100 adhering to the piezoelectric fiber 10 arranged on the outside is large, a large amount of water is exposed to the outside. Therefore, the water content is more likely to evaporate than when the surfactant 100 adheres in a uniform manner.
  • the amount of the surfactant 100 adhering to the piezoelectric fiber 10 arranged on the outside is large, water is easily drawn into the inside of the yarn. In this case, the outside becomes dry. Therefore, the electric field formed between the yarn 1 and the yarn 2 is easily maintained.
  • FIG. 6 is a cross-sectional view of the thread 1A according to a modified example of the thread 1.
  • the thread 1A includes a resin 50 between the plurality of piezoelectric fibers 10.
  • Resin 50 is an example of an insulator.
  • the resin 50 is arranged so as to coat the periphery of the piezoelectric fiber 10 arranged at the center and fill the gap with the surrounding piezoelectric fiber 10. Therefore, the surfactant 100 adheres more to the outside than the inside of the thread 1A.
  • Such a thread 1A adheres a large amount of surfactant 100 to the outside. Therefore, the water is more likely to evaporate. Therefore, the thread 1A can easily maintain the electric field.
  • the resin 50 makes it difficult for moisture to enter the thread 1A. From this point as well, the thread 1A can easily maintain an electric field.
  • the thread 2A according to the modified example 2 provided with the resin 50 can be configured for the thread 2 as in the example of FIG. 6
  • the thread 1A may be a covering thread in which the piezoelectric fiber 10 is coated with the resin 50 and the coated piezoelectric fiber 10 is arranged as the core thread. In this case, the other plurality of piezoelectric fibers 10 rotate around the core yarn.
  • the surfactant 100 adheres more to the outside than the inside of the thread 1A.
  • the core thread may be a material to which the surfactant 100 does not easily adhere. Also in this case, the surfactant 100 adheres more to the outside than to the inside.
  • the sheath yarn wound around the core yarn is not limited to the filament yarn, and may be a film-shaped piezoelectric material.
  • the filament yarn may be false twisted yarn. False plying has many gaps. Therefore, the surfactant 100 easily adheres to the false plying yarn. In addition, the false plying has a good texture.
  • the thread may have thick fibers on the inside and a plurality of thin piezoelectric fibers 10 on the outside. Also in this case, the surfactant 100 adheres more to the outside than to the inside.
  • the amount of adhesion of the surfactant 100 on the inner side and the outer side of the hollow fiber or the thread having irregularities on the surface is different.
  • the piezoelectric fibers constituting the yarn are not limited to long fibers, and may contain at least one short fiber.
  • the yarn is a spun yarn obtained by twisting a plurality of short fibers, the shape is more complicated than that of the long fibers. Therefore, the amount of the surfactant 100 adhered is not uniform.
  • the ends of some short fibers are exposed from the sides of the yarn. That is, more fibers are exposed on the surface of the yarn. Therefore, when short fibers are used, more surfactant adheres to the outside than to the inside.
  • the Z yarn using PDLA can be considered.
  • the S yarn using PDLA can be considered.
  • the fabric 75 shown in FIG. 7 includes the yarn of the present embodiment described above.
  • the fabric 75 containing the yarn shown in the present embodiment also easily maintains an electric field.
  • the maximum value and the minimum value of the contact angle at the time of pulling up were ⁇ 10 ° or more from the center value, respectively. Therefore, it can be seen that the adhesion mode of the surfactant is not uniform also for the cloth 75.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Woven Fabrics (AREA)
PCT/JP2020/043599 2019-11-26 2020-11-24 糸および布帛 Ceased WO2021106843A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2021561407A JP7131715B2 (ja) 2019-11-26 2020-11-24 糸および布帛
CN202090000982.3U CN219342438U (zh) 2019-11-26 2020-11-24 纱线和布帛

Applications Claiming Priority (2)

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JP2019213068 2019-11-26
JP2019-213068 2019-11-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023248612A1 (ja) * 2022-06-22 2023-12-28 株式会社村田製作所 糸，布および糸の製造方法
US11950280B2 (en) 2018-05-10 2024-04-02 Interdigital Patent Holdings, Inc. Channelization and BWP

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000248442A (ja) * 1999-03-03 2000-09-12 Unitika Ltd 抗菌性交編織物
JP2004027374A (ja) * 2002-06-21 2004-01-29 Nippon Ester Co Ltd ポリ乳酸系繊維
JP2005232645A (ja) * 2004-02-23 2005-09-02 Toray Ind Inc ポリ乳酸繊維およびその製造方法、並びにそのポリ乳酸繊維からなる産業資材用繊維構造体
WO2018211817A1 (ja) * 2017-05-19 2018-11-22 株式会社村田製作所 抗菌繊維、シート、およびシートカバー
WO2019239866A1 (ja) * 2018-06-12 2019-12-19 花王株式会社 抗菌繊維および衣料

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3557027B2 (ja) * 1996-01-26 2004-08-25 トヨタ自動車株式会社 自然分解性複合糸およびその製品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000248442A (ja) * 1999-03-03 2000-09-12 Unitika Ltd 抗菌性交編織物
JP2004027374A (ja) * 2002-06-21 2004-01-29 Nippon Ester Co Ltd ポリ乳酸系繊維
JP2005232645A (ja) * 2004-02-23 2005-09-02 Toray Ind Inc ポリ乳酸繊維およびその製造方法、並びにそのポリ乳酸繊維からなる産業資材用繊維構造体
WO2018211817A1 (ja) * 2017-05-19 2018-11-22 株式会社村田製作所 抗菌繊維、シート、およびシートカバー
WO2019239866A1 (ja) * 2018-06-12 2019-12-19 花王株式会社 抗菌繊維および衣料

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11950280B2 (en) 2018-05-10 2024-04-02 Interdigital Patent Holdings, Inc. Channelization and BWP
US12284675B2 (en) 2018-05-10 2025-04-22 Interdigital Patent Holdings, Inc. Channelization and BWP
WO2023248612A1 (ja) * 2022-06-22 2023-12-28 株式会社村田製作所 糸，布および糸の製造方法
JP2024001705A (ja) * 2022-06-22 2024-01-10 株式会社村田製作所 糸，布および糸の製造方法

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Publication number Publication date
JP7131715B2 (ja) 2022-09-06
JPWO2021106843A1 (https=) 2021-06-03
CN219342438U (zh) 2023-07-14

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