JP5053141B2 - Spun yarn and method for producing the same - Google Patents

Description

  The present invention relates to a spun yarn and a method for producing the spun yarn, and more particularly to a spun yarn that can reflect a heat storage and heat retention effect and a unique function of a natural fiber or recycled fiber on a woven or knitted fabric. .

  Conventionally, various studies have been made in order to impart heat retention to sports, leisure clothing, cold clothing, and the like. For example, for woven and knitted fabrics using synthetic fibers, those using hollow fibers that utilize the heat insulation of air, and those that use the warming effect of the padding by inserting padding between the outer material and the lining are proposed. ing. However, such a knitted or knitted fabric is generally thick and has a problem that it is not particularly suitable for the field of sports clothing that is required to follow the movement of the body. In addition, although a technique has been proposed in which heat dissipation from the body is reduced by using a woven or knitted fabric on which a metal such as aluminum or titanium is used as a backing, a problem remains in terms of durability.

  There is also an attempt to impart heat retention to woven and knitted fabrics using natural fibers and recycled fibers. As an example, one in which carbon black is fixed to the fiber surface has been proposed. However, there remains a problem in durability as described above, such as interfacial peeling due to insufficient adhesion between the binder layer used for fixing carbon black and the fiber surface. In addition, a woven or knitted fabric using this fiber generally has a hard texture, and this point has not been solved yet.

  There are various proposals for these problems. For example, Patent Document 1 proposes a technique in which transition metal carbides belonging to Group 4 of the periodic table are contained in polyester fibers or polyamide fibers to absorb sunlight and emit far infrared rays.

  Patent Document 2 proposes a technique that uses a fibrous material in which ceramics such as alumina, zirconia, magnesia, and titanium are kneaded, paying attention to the heat retaining effect by far infrared rays. These ceramics have a function of emitting far infrared rays.

Further, Patent Document 3 proposes a hygroscopic exothermic composite spun yarn in which natural fibers or hygroscopic exothermic properties or modified natural fibers are arranged as core components.
Japanese Patent Publication No. 03-009202 Japanese Patent Laid-Open No. 01-306607 JP 2003-293235 A

  However, transition metal carbides belonging to Group 4 of the periodic table used in the technique according to Patent Document 1 are generally very hard with a hardness of 7 to 10, and when this is exposed on the fiber surface, the thread is passed through in each step. The guide may be damaged. Therefore, when kneading such a carbide into a fiber, it is necessary to arrange it near the center of the fiber. If it does so, a restriction | limiting arises in setting of a fineness, a cross-sectional shape, etc., and the problem that fibers, such as a hollow fiber which can provide various functionality to a knitted fabric, an ultrafine fiber, and an atypical cross-section fiber, becomes difficult.

  Moreover, in the technique concerning patent document 2, since ceramics are white type | system | groups, sunlight cannot fully be absorbed, and as a result, the heat retention effect show | played is not satisfactory.

  Furthermore, the spun yarn according to Patent Document 3 is specifically a hygroscopic exothermic composite spun yarn using a natural fiber with an official moisture content of 15%, which exhibits the function of natural fiber, but has a heat storage effect by sunlight. This also leaves a problem with the heat retention effect.

  Thus, the actual situation is that a spun yarn that can simultaneously reflect an excellent heat storage effect and a function unique to natural fibers, regenerated fibers, and the like in a woven or knitted fabric has not yet been proposed.

  The present invention has been made in view of the above-mentioned present situation, a novel spun yarn that can simultaneously reflect the heat storage and heat retention effect by sunlight and the unique function of natural fiber or regenerated fiber in a woven or knitted fabric, An object of the present invention is to provide a method for efficiently producing the spun yarn.

As a result of intensive studies, the present inventors have reached the present invention. That is, the gist of the present invention is as follows.
(1) 20 to 90% by mass of a synthetic fiber having a fiber length of 30 to 250 mm, comprising a near-infrared absorber comprising a cyanine compound, a phthalocyanine compound, a dithiol metal complex, a naphthoquinone compound, an anthraquinone compound, a diimmonium compound or an azo compound A spun yarn comprising 80% to 10% by mass of natural fiber and / or recycled fiber, and having a reflectance of 50% or less at a wavelength of 700 to 850 nm.
(2) The spun yarn according to ( 1 ) , wherein the synthetic fiber is polyethylene terephthalate, nylon 6, or polylactic acid.
(3) 100 synthetic fibers having a fiber length of 30 to 250 mm using an aqueous dispersion containing a near-infrared absorber comprising a cyanine compound, a phthalocyanine compound, a dithiol metal complex, a naphthoquinone compound, an anthraquinone compound, a diimmonium compound or an azo compound. A method for producing a spun yarn, which is subjected to wet heat treatment at ˜135 ° C., dried and then spun using 20 to 90 mass% of the synthetic fiber and 80 to 10 mass% of natural fiber and / or recycled fiber.

  ADVANTAGE OF THE INVENTION According to this invention, the spun yarn which can provide the heat storage and heat retention effect by sunlight, and the unique function which a natural fiber or a reproduction | regeneration fiber has simultaneously to a woven / knitted fabric can be provided.

  In addition, according to the production method of the present invention, since a method of attaching a near-infrared absorber to the fiber surface is adopted, any synthetic fiber can be implemented regardless of the shape, and as a result, a heat storage effect on the woven / knitted fabric It is expected to impart any property other than.

  In view of the above, the spun yarn of the present invention can be preferably applied to underwear, socks, sweaters, etc., in addition to sports and leisure clothing and cold clothing.

  Hereinafter, the present invention will be described in detail.

  As the near-infrared absorbing agent in the present invention, any can be used, but basically, those capable of absorbing light in the near-infrared region (700 to 2000 nm) are preferably employed. Specifically, cyanine compounds, phthalocyanine compounds, dithiol metal complexes, naphthoquinone compounds, anthraquinone compounds, diimmonium compounds, and azo compounds are used.

  In addition, the synthetic fiber in the present invention is not particularly limited as long as it exhibits a strength sufficient to withstand use when it is woven or knitted. However, polyester and polyamide are preferable from the viewpoint of use. Among polyesters, polyethylene terephthalate obtained by polycondensation of dimethyl terephthalate or terephthalic acid and ethylene glycol, polybutylene terephthalate obtained by polycondensation of dimethyl terephthalate and butanediol, and the like are particularly preferable. Polyethylene terephthalate is preferable from the viewpoints of dimensional stability of the knitted or knitted fabric and production cost. In view of environmental problems, it is also possible to select polylactic acid as the polyester. As polylactic acid, in addition to general poly L lactic acid and poly D lactic acid, a stereocomplex obtained by mixing both is also effective.

  On the other hand, as the polyamide, nylon 66 obtained by using hexamethylenediamine and adipic acid, nylon 6 obtained by ring-opening polymerization of ε-caprolactam, and the like are preferable, and nylon 6 is particularly preferable in terms of cost.

  Since the synthetic fiber in the present invention is used as one unit constituting the spun yarn, it needs to have a specific fiber length. That is, it is necessary to satisfy the range of 30 to 250 mm as the fiber length. If the fiber length of the synthetic fiber is out of this range, a spun yarn with a uniform degree cannot be obtained.

  Further, the fiber diameter and cross-sectional shape of the synthetic fiber are not particularly limited, but in general, the fiber diameter is preferably in the range of 3 to 50 μm, and the cross-sectional shape may be triangular, hexagonal, flat, etc. in addition to a round cross-section. An irregular cross section, a hollow cross section and the like are preferable. When a material other than a round cross section is employed, characteristics according to the fiber cross section can be imparted to the woven or knitted fabric. For example, if a hollow cross section is employed, the weight of the woven or knitted fabric can be reduced. In the present invention, these synthetic fibers are generally used alone, but a plurality of them may be used as necessary.

  The spun yarn of the present invention contains the above synthetic fiber. However, the desired effect cannot be obtained by this alone. Therefore, in addition to this, natural fibers and / or recycled fibers are used.

  Examples of natural fibers in the present invention include cotton, hemp, wool, and natural bamboo. Examples of regenerated fibers include solvent-spun cellulose fibers, viscose rayon, and cupra.

  As described above, the spun yarn of the present invention is composed of a specific synthetic fiber and natural fiber and / or recycled fiber. The content ratio of both fibers in the spun yarn of the present invention is as follows. It is necessary to contain 20 to 90% by mass and the latter 80 to 10% by mass. If the content ratio of both fibers is out of this range, the heat storage / heat retention effect and the unique functions of natural fibers or recycled fibers cannot be reflected in a woven or knitted fabric in a balanced manner.

  The spun yarn of the present invention can impart such excellent properties to the woven or knitted fabric, but among these, for the heat storage and heat retention effect, it is not sufficient to simply blend the two fibers in a predetermined ratio, The spun yarn finally obtained must have a reflectance of 50% or less at a wavelength of 700 nm to 850 nm. This is because if the reflectance exceeds 50%, light cannot be sufficiently converted into heat energy. In other words, in order to impart a heat storage / warming effect to the woven or knitted fabric, the spun yarn needs to contain both the fibers at a specific ratio and at the same time have a specific reflectance. In other words, the heat storage / heat retention effect is obtained by functionally or functionally relating the two configurations, and can be said to be a synergistic effect by the so-called two configurations.

  Next, the manufacturing method of the heat retention fiber of this invention is demonstrated.

  First, a synthetic fiber having a fiber length of 30 to 250 mm in the form of rose hair, tow or sliver is prepared, and this synthesis is carried out by using an aqueous dispersion containing a near-infrared absorber with a rose hair dyeing machine, an overmeier dyeing machine, or the like. Wet heat-treat the fibers. The aqueous dispersion preferably contains a surfactant from the viewpoint of uniformly dispersing the near-infrared absorber, and as the surfactant, any of nonionic, anionic and cationic can be used. is there. The purpose of the wet heat treatment of the synthetic fiber using the aqueous dispersion is to attach the near-infrared absorbent to the synthetic fiber. Needless to say, even if such an absorbent is attached only to the fiber surface, it is of course predetermined. Heat storage and heat retention effects can be achieved. However, in order to realize a higher effect, it is preferable to exhaust the near infrared absorber into the fiber together with the fiber surface. From this point, in the present invention, the near infrared absorber is exhausted as a surfactant. It is preferable to employ an excellent nonionic and / or anionic one.

  In addition to this, from the viewpoint of improving the light resistance of the synthetic fiber, the aqueous dispersion may contain an ultraviolet absorber and other various function-imparting agents according to the purpose.

  In the present invention, such wet heat treatment is performed at a temperature of 100 to 135 ° C. When the temperature of the wet heat treatment is less than 100 ° C., it is difficult to fix the near-infrared absorbent to the fiber, and as a result, it is difficult to impart a heat storage / heat retaining effect to the woven or knitted fabric, which is not preferable. On the other hand, when the temperature exceeds 135 ° C., the synthetic fiber is easily embrittled by heat, and as a result, the physical properties of the yarn may be deteriorated. The heat treatment time is generally preferably 10 to 60 minutes.

  After the wet heat treatment of the synthetic fiber, the fiber is dried, and then the resultant synthetic fiber is spun using the natural fiber and / or regenerated fiber prepared in advance. As a use ratio of both fibers at the time of spinning, the synthetic fiber is 20 to 90% by mass, and the natural fiber and / or the regenerated fiber is 80 to 10% by mass.

  Spinning refers to spinning a fiber lump into a yarn. Specifically, the draft is repeated on the fiber lump, the fibers are gradually arranged in parallel, and twisted to form a thin and strong yarn.

  Spinning generally consists of a plurality of processes, and undergoes slightly different processes depending on the length of the fiber used. In general, the cotton spinning method is adopted when the fiber length is 30 to 50 mm, and the worsted spinning method is adopted when the fiber length is 40 to 250 mm. However, even in the same spinning method, the number of steps may be slightly different depending on the purpose. However, the basic process is the same in any spinning method. That is, a mixed cotton process for opening fibers, a carding process for removing and collimating fibers, a kneading process for homogenizing thick fiber bundles, a roving process for narrowing fiber bundles by drafting, and twisting while drafting It is common in that spinning is performed sequentially through the spinning steps to be applied, and it is easy for those skilled in the art to design a process to be adopted based on this basic process.

  Although the spun yarn of the present invention can be obtained as described above, the spun yarn can take various forms depending on the purpose. Structure, sea-island structure, etc.

  Next, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the following examples.

Example 1
First, a sliver made of a hollow cross-section polyester fiber having a fiber length of 80 mm and a fiber diameter of 14 μm and a hollow ratio of 40% was prepared. Then, using a coiling motion, the sliver was overlapped from below and compressed to form a bump.

  Then, this bump winding is loaded into a carrier, and the bump winding is carried out for 30 minutes at a bath ratio of 1:10 and a temperature of 130 ° C. with an aqueous dispersion having the composition shown in the following formula 1 using an Overmeier dyeing machine. Wet heat treatment.

<Prescription 1>
Near-infrared absorber (“KP DEEPER NR (trade name)” manufactured by Nippon Kayaku Co., Ltd. 6% owf
Surfactant (“Nikkasan Salt RN130E (trade name)” manufactured by Nikka Chemical Co., Ltd.) 0.5 g / L
Acetic acid 0.1cc / L

  Subsequently, the bump winding was washed and oiled using the Overmeyer dyeing machine, and the sliver was dehydrated and opened with a mangle and dried with a conveyor dryer.

  Next, the obtained sliver and a sliver made of wool fibers were sequentially blended at a mass ratio of 30:70 to obtain a roving yarn. The obtained roving was supplied to the fine spinning machine in the form of single roving and twisted at 660 times / m while giving a draft of 20 times to obtain a spun single yarn.

  Thereafter, the above spinning single yarn is used and twisted at 690 times / m, the spinning of the present invention having a thickness of 40 (metric) and 30% by weight of synthetic fiber and 70% by weight of natural fiber. I got a thread.

(Comparative Example 1)
Instead of a hollow cross-section polyester fiber to which a near-infrared absorber is attached, a solid cross-section solid polyester fiber (fiber length of 80 mm, fiber diameter of 14 μm) having a core-sheath structure containing 2% by mass of zirconium carbide in the core portion. A spun yarn having a thickness of 40 (metric) was obtained in the same manner as in Example 1 except that it was used.

(Example 2)
First, a solid polyester fiber having a round cross section with a fiber length of 38 mm and a fiber diameter of 14 μm was loaded into a carrier for dyeing rose, and then the concentration of the near-infrared absorber in the above-mentioned prescription 1 using an overmeier dyeing machine. The fiber was wet-heat treated with an aqueous dispersion having a composition of 4% owf instead of 6% owf for 30 minutes at a bath ratio of 1:10 and a temperature of 135 ° C.

  Subsequently, the fibers were washed and oiled using the same Overmeyer dyeing machine, dehydrated with mangles, and dried with a batch dryer.

  Next, the obtained polyester fiber and cotton fiber were blended in order at a mass ratio of 65:35 to obtain a roving yarn having a thickness of 0.5 g / m and a twist number of 0.8 times / m. The obtained roving is supplied to the spinning machine in the form of single roving, twisted 23 times / 2.54 cm while giving a draft of 35 times, 65% by mass of synthetic fiber and 35% by mass of natural fiber A spun yarn of the present invention having a thickness of 40 (English cotton count) was obtained.

(Comparative Example 2)
A spun yarn having a thickness of 40 (English cotton count) was obtained in the same manner as in Example 2 except that the wet heat treatment using the aqueous dispersion was omitted.

(Example 3)
First, Example 2 except that solid nylon 6 fiber having a round length of 38 mm and a fiber diameter of 5 μm is used instead of solid polyester fiber having a round cross section, and the wet heat treatment temperature is set to 100 ° C. instead of 135 ° C. The fiber was wet-heat treated in the same manner as described above, and then the fiber was similarly washed, oiled, dehydrated and dried.

  Next, the obtained nylon 6 fiber and solvent-spun cellulose fiber were sequentially blended at a mass ratio of 50:50 to obtain a roving yarn having a thickness of 0.5 g / m and a twist number of 0.8 times / m. Was spun in the same manner as in Example 2 to obtain a spun yarn of the present invention having a thickness of 40 (English cotton count) comprising 50% by mass of synthetic fiber and 50% by mass of natural fiber.

(Comparative Example 3)
Instead of a solid nylon 6 fiber with a round cross section to which a near-infrared absorber is attached, a solid cross-section solid nylon with a core sheath structure having a fiber length of 38 mm and a fiber diameter of 16 μm, containing 2% by mass of zirconium carbide in the core part. A spun yarn having a thickness of 40 (metric) was obtained in the same manner as in Example 3 except that 6 fibers were used.

  About the spun yarn obtained above, the following items were evaluated according to the following criteria. The results are shown in Table 1.

1. Reflectivity After making the target spun yarn into a tubular knitted fabric using a cylinder knitting machine manufactured by Koike Machinery Co., Ltd., the reflectance of the knitted fabric with a wavelength of 700 to 850 nm is measured using a spectrophotometer. This was taken as the reflectance of the spun yarn.

2. Heat storage and heat retention effect A 100 mm square window is provided on a foamed polystyrene board having a thickness of 10 mm, and the cylindrical knitted fabric is attached so as to cover the window. Next, in an outdoor environment with an illuminance of 100000 Lux and an air temperature of 20 ° C., the board is tilted so that sunlight directly strikes the tubular knitted fabric, and the temperature of the back surface of the tubular knitted fabric is determined by the infrared thermal imaging device “Thermo” manufactured by NEC Sanei Co., Ltd. Observe with "Tracer TH7102 (trade name)" and measure the temperature when equilibrium is reached. This temperature was used as a standard for evaluating the heat storage / heat retention effect.

3. Texture The above-mentioned tubular knitted fabric was evaluated by a sensory test in three stages from ○ (excellent) to × (poor).

  As can be seen from Table 1, the tubular knitted fabric using the spun yarn of the present invention has not only a heat storage and heat retention effect but also a unique function and texture of natural fibers or recycled fibers.

  In addition, the wet heat treatment of each synthetic fiber did not cause any particular problems in the process and could be carried out efficiently.

Of the above examples, in Example 1, since the hollow cross-sectional polyester fiber was used as the synthetic fiber in the spun yarn, the weight of the tubular knitted fabric could also be achieved.

Claims (3)

20% to 90% by mass of a synthetic fiber having a fiber length of 30 to 250 mm, comprising a near infrared absorber comprising a cyanine compound, a phthalocyanine compound, a dithiol metal complex, a naphthoquinone compound, an anthraquinone compound, a diimmonium compound or an azo compound , and natural A spun yarn comprising 80 to 10% by mass of fibers and / or recycled fibers, and having a reflectance at a wavelength of 700 to 850 nm of 50% or less.   The spun yarn according to claim 1, wherein the synthetic fiber is polyethylene terephthalate, nylon 6, or polylactic acid. Using an aqueous dispersion containing a near-infrared absorber comprising a cyanine compound, a phthalocyanine compound, a dithiol metal complex, a naphthoquinone compound, an anthraquinone compound, a diimmonium compound or an azo compound, a synthetic fiber having a fiber length of 30 to 250 mm is converted to 100 to 135 ° C. A method for producing a spun yarn, wherein the synthetic fiber is spun using 20 to 90% by mass, natural fiber and / or regenerated fiber is used in an amount of 80 to 10% by mass.