JP5848599B2 - Dyeing method of knitted fabric made of polyurethane elastic fiber, knitted fabric dyed by the method, elastic garment using the knitted fabric and elastic garment material - Google Patents

Description

  The present invention relates to a method for dyeing a knitted fabric made of polyurethane-based elastic fibers. More specifically, the present invention has excellent stretchability, dimensional stability, fit to the skin, excellent strength retention, and rich design. The present invention relates to a method for dyeing a knitted fabric made of polyurethane-based elastic fibers, a knitted fabric dyed by the method, a stretchable garment using the knitted fabric, and a stretchable garment material.

  Due to its excellent stretch properties, polyurethane elastic fibers are widely used in stretch clothing applications such as fitness wear, leotards, spats, leg wear, inner wear, sports wear, swimwear, and industrial materials. Such elastic fibers are generally used in combination with various materials. For example, not only synthetic fibers such as polyamide fibers, polyester fibers and acrylic fibers, but also natural fibers such as cotton, wool, rayon, and semi-fibers. Combined with synthetic fiber, it is used more and more recently. Moreover, in recent years, there has been a demand for clothing that fits the body, is easy to move, and pursues comfort, and various technical improvements have been proposed for clothing using these elastic fibers.

  However, the above-mentioned polyurethane-based elastic fibers are not easy to dye with high fastness, are liable to cause discoloration, fading, discoloration and the like, and cause color transfer to other clothing. For this reason, conventionally, in order to enhance the designability by dyeing in a desired color even when using polyurethane-based elastic fibers to enhance stretchability, natural fibers and synthetic fibers that are easily dyed can be used. Used in combination with inelastic fibers.

  For example, a circular knitted fabric excellent in stretchability, stretch recovery, and fit has been proposed and used by combining non-elastic fibers such as synthetic fibers and polyurethane-based elastic fibers in a plating knitting etc. The elastic fibers are preferably used in addition to those mixed with non-elastic fibers such as polyester fibers, and covering yarn in which non-elastic fibers are wound around, as well as bare yarn (bare yarn) (for example, patent documents). 1 and 2 (hereinafter referred to as prior art 1).

  Further, a swimsuit knitted fabric having good dimensional stability and excellent stretchability by knitting about 80% acrylic fiber yarn and about 20% polyurethane elastic fiber yarn has been proposed. (For example, refer to Patent Document 3, hereinafter referred to as Conventional Technology 2).

  However, in the above prior art 1, the stretchability is limited because the stretchability is determined by the number of loops of the knitted fabric in a certain area (multiplication of the number of courses and the number of wales), that is, the knitted fabric density. In addition, since inelastic fibers are included, distortion of the knitted fabric due to repeated wear gradually increases, and it is difficult to avoid a decrease in fit.

  Further, in the above-mentioned prior art 2, the above-mentioned non-elastic fibers are easily shrunk by various processes such as a dyeing process. For this reason, the polyurethane-based elastic fibers are combined with the non-elastic fibers at a high temperature such as 195 ° C. Dimensional stability was improved by heat setting. As a result, it is difficult to avoid power loss of the polyurethane elastic fiber, and there is a problem that it is not easy to maintain high extensibility.

JP 2009-174099 A JP 2006-328567 A Japanese Patent Laid-Open No. 2005-120521

  The technical problem of the present invention is to solve the above problems, have excellent stretchability and dimensional stability, fit to the skin, excellent strength retention, and can be made into a knitted fabric rich in design, An object of the present invention is to provide a method for dyeing a knitted fabric made of polyurethane-based elastic fibers, a knitted fabric dyed by the method, a stretchable garment and a stretchable garment material using the knitted fabric.

In order to solve the above-mentioned problems, the present invention is configured as follows.
That is, the present invention 1 relates to a method for dyeing a knitted fabric made of polyurethane-based elastic fibers, which is a method for dyeing a knitted fabric knitted only with a knitting yarn made of polyurethane-based elastic fibers, wherein the polyurethane-based elastic fibers are mainly polymers. A polyurethane-based elastic fiber obtained by the reaction of a diol, a diisocyanate, and a chain extender, and containing a polymer containing a sulfonic acid group, and at least one of before and after the above knitting, a cation It dye | stains at 30 degreeC or more and 130 degrees C or less using dye, It is characterized by the above-mentioned.

The present invention 2 relates to a knitted fabric made of polyurethane-based elastic fibers, and is a knitted fabric using only knitting yarn made of polyurethane-based elastic fibers, characterized in that it is dyed by the dyeing method of the present invention 1 described above.
In addition, the present invention 3 relates to a stretchable garment, wherein the knitted fabric made of the polyurethane elastic fiber of the above-mentioned present invention 2 is used.
Furthermore, the present invention 4 relates to a stretchable garment material, characterized in that the knitted fabric made of the polyurethane elastic fiber of the above-mentioned present invention 2 is used.

  The above knitted fabric uses only knitting yarn made of polyurethane-based elastic fibers, so it has excellent stretchability, and is excellent in dimensional stability without distortion or deformation even when worn repeatedly. Good elasticity is maintained well forever, and the fit to the skin is good. The polyurethane-based elastic fiber is a polyurethane-based elastic fiber obtained mainly by the reaction of a polymer diol, diisocyanate, and a chain extender, and contains a polymer containing a sulfonic acid group. Since it is used and dyed at 30 ° C. or higher, discoloration, fading, discoloration and the like hardly occur, and excellent dyeing fastness is exhibited. In addition, since the dyeing temperature is 130 ° C. or lower, the embrittlement of the polyurethane fiber is suppressed, the above-mentioned stretchability is maintained well, and the strength is also kept good.

  When the above dyeing is applied to the knitted fabric after knitting, the knitted fabric uses only a knitting yarn made of polyurethane elastic fiber, so that it has excellent dimensional stability and changes in dimensions. Since the rate is small and wrinkles do not occur, it is possible to omit heat setting such as pre-setting and finishing set. However, after dyeing, if the finish is set at a predetermined temperature, the surface of the knitted fabric becomes smooth and part of the knitting yarns are easily fused, so that the knitting yarns protrude from the stitches. It is preferable to reduce the occurrence of the so-called “scratch” phenomenon, which is maintained at the same time, and the so-called “run” phenomenon in which the stitches are released one after another when the knitting yarn of the polyurethane elastic fiber is cut. In addition, from the viewpoint of knitted fabric quality and dimensional stability, the above finishing set temperature is preferably 190 ° C. or less, and heat setting at 150 to 180 ° C. can suppress embrittlement of the polyurethane elastic fiber. More preferable from the viewpoint.

  Since the knitted fabric of the present invention 2 is knitted using only a knitting yarn made of polyurethane-based elastic fiber, it has excellent dimensional stability and prevents loosening of the knitted fabric when repeatedly worn. However, the dimensional change rate measured by the G method (household electric washing machine method) defined in 8.39 (dimensional change) of JIS L 1096: 2010 (fabric and knitted fabric test method) It is preferable that both the wale direction (longitudinal direction) and the course direction (lattice direction) are −2% or more and + 2% or less because a more excellent dimensional stability can be exhibited, and the dimensional change rate is −1% or more, +1 % Or less is more preferable.

Further, the knitted fabric of the present invention 2 is not limited to one using a knitting yarn having a specific fineness or a specific knitted fabric density or knitted structure. It varies depending on the fineness and knitted fabric density as well as the stitch structure, and is not limited to a specific value.
However, the fineness (total fineness) of the knitting yarn made of the polyurethane elastic fiber is preferably 11 dtex or more, more preferably 22 dtex, and further preferably 33 dtex. Further, the upper limit of the fineness of the knitting yarn is not limited to a specific value, but if it is too large, the knitted fabric becomes thick, so it is preferably 310 dtex or less, more preferably 156 dtex or less.

  When the stress at 200% elongation of the knitted fabric is smaller than 100 cN, the feeling of tightening when wearing the garment using the knitted fabric is lowered and a fit cannot be obtained, and the stress is larger than 3000 cN. This is not preferable because it restricts the movement of the body when worn. Therefore, although the stress at the time of 200% elongation of this knitted fabric varies depending on the use of the garment, it is preferably set to 100 to 3000 cN, more preferably set to 100 to 2000 cN, and further preferably set to 100 to 1000 cN. Most preferably, it is set to 100 to 600 cN. By using the knitting yarn having these finenesses and setting the stress at the time of 200% elongation, the fit to the skin can be improved without excessively restraining the body.

  The knitted fabric of the present invention 2 is excellent in stretchability, dimensional stability and fitability to the skin, and therefore can be used for any application where these are required, particularly fitness wear, leotards, spats, legwear, innerwear. It is suitably used alone or in combination with other woven fabrics and knitted fabrics for various elastic clothing such as clothing, sportswear and swimwear, and various elastic clothing materials such as anti-slip tape, waistband and underwear tape.

  The method for dyeing a knitted fabric made of the polyurethane-based elastic fiber of the present invention, the knitted fabric dyed by the method, and the elastic garment and the elastic garment material using the knitted fabric are constituted and act as described above. The following effects are achieved.

The above knitted fabric uses only knitting yarn made of polyurethane-based elastic fibers, so it has excellent stretchability, and is excellent in dimensional stability without distortion or deformation even when worn repeatedly. In addition, good stretchability is sufficiently maintained forever, and the fit to the skin is good.
In addition, polyurethane-based elastic fibers can be dyed well, and excellent dyeing fastness can be exhibited. Moreover, since the dyeing temperature is 130 ° C. or lower, embrittlement of the polyurethane can be suppressed, the above excellent stretchability and the like can be maintained well, and the strength can also be kept good. As a result, it is possible to provide a knitted fabric having excellent stretchability, dimensional stability, fit to skin, excellent strength retention, and rich design.

1 is a knitting structure diagram of a circular knitted fabric of Example 1. FIG. 3 is a knitting structure diagram of a circular knitted fabric of Example 2. FIG. It is a knitting organization chart of the circular knitted fabric of Example 3. It is the measurement result comparison table 1 which shows the measurement result of the dye fastness of Examples 1-4. It is a measurement result contrast table 2 which shows the measurement result of dyeing | staining temperature and bursting strength of Examples 1-10.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present invention relates to a method for dyeing a knitted fabric knitted only with a knitting yarn made of polyurethane-based elastic fibers. The polyurethane-based elastic fiber is a polyurethane-based elastic fiber obtained mainly by a reaction of a polymer diol, diisocyanate, and a chain extender, and contains a polymer containing a sulfonic acid group. And this polyurethane type elastic fiber is dye | stained at 30 degreeC or more and 130 degrees C or less using a cationic dye in at least any one before and after the knitting of said knitted fabric.

The dyeing machine used for the above dyeing is not particularly limited and may be either dip dyeing or textile printing. However, a normal liquid dyeing machine, a beam dyeing machine, a paddle dyeing machine, and the like are preferable from the viewpoint of productivity and uniform dyeing.
The above dyeing temperature can be arbitrarily set as long as it is 30 ° C. or higher and 130 ° C. or lower, but is more preferably 50 ° C. or higher from the viewpoint of fastness to dyeing and dyeing quality, and from the viewpoint of keeping the strength of the knitted fabric high. , 100 ° C. or less, more preferably 90 ° C. or less. In addition, drying after dyeing is preferably performed at 130 ° C. or lower by a normal method.

Since the above knitted fabric is knitted only with polyurethane elastic fiber yarns, it has excellent dimensional stability, has a small dimensional change rate, and does not generate wrinkles. It is possible to omit the heat set. However, the above knitted fabric may be heat-set as a finishing set on the dyed knitted fabric for the reason of smoothing the surface. This finishing set is preferably performed at 190 ° C. or less from the viewpoint of knitted fabric quality and dimensional stability, and it is more preferable to perform heat setting at 150 to 180 ° C. from the viewpoint of suppressing embrittlement of the polyurethane elastic fiber. .
In addition, the heating time of said heat set is not specifically limited, For example, it sets in the range for 30 second-5 minutes.

  A knitted fabric using only the knitting yarn made of the polyurethane-based elastic fiber is excellent in dimensional stability, and can prevent loosening of the knitted fabric when repeatedly worn. In addition, this knitted fabric has a dimensional change measured by a test method according to JIS L 1096: 2010 (fabric and knitted fabric test method), G method (household electric washing machine method) defined in 8.39 (dimensional change). When the rate is −2% or more and + 2% or less in both the wale direction and the course direction, it is possible to exhibit further excellent dimensional stability, and it is more preferable that the ratio is −1% or more and + 1% or less.

  Further, the knitting yarn made of the polyurethane-based elastic fiber preferably has a fineness (total fineness) of 11 dtex or more, more preferably 22 dtex, and even more preferably 33 dtex. The upper limit of the fineness of the knitting yarn is not limited to a specific value, but if it is too large, the knitted fabric will be thick, so it is preferably 310 dtex or less, more preferably 156 dtex or less. The breaking elongation of the knitting yarn is preferably 300% or more. The cross-sectional shape of the knitting yarn may be circular, flat or other shapes.

  In the knitted fabric using only the knitting yarn made of the polyurethane-based elastic fiber, the stress at 200% elongation is set to 100 to 3000 cN. When the stress at 200% elongation is 100 cN or less, the feeling of tightening is lowered, and when it is 3000 cN or more, the movement of the body is restrained. Therefore, although the stress at the time of 200% elongation varies depending on the use of clothing, it is preferably set to 100 to 3000 cN, more preferably set to 100 to 2000 cN, and more preferably set to 100 to 1000 cN. Preferably, it is set to 100 to 600 cN.

  The polyurethane-based elastic fiber may be any polyurethane as long as the main component is a polyurethane obtained by the reaction of a polymer diol, a diisocyanate, and a chain extender, and is not particularly limited. Also, the synthesis method is not particularly limited.

  As the polymer diol, polyether glycol, polyester glycol, polycarbonate diol and the like are preferable. In particular, polyether glycol is preferably used from the viewpoint of imparting flexibility and elongation to the yarn.

  Specific examples of the polyether glycol include polyethylene glycol, modified polyethylene glycol, polypropylene glycol, polytrimethylene ether glycol, polytetramethylene ether glycol (hereinafter abbreviated as PTMG), tetrahydrofuran (hereinafter abbreviated as THF). ) And 3-methyl-THF are modified PTMG, THF and 2,3-dimethyl-THF are modified PTMG, THF and neopentyl glycol are modified PTMG, THF and Examples thereof include random copolymers in which ethylene oxide and / or propylene oxide are irregularly arranged. One kind of these polyether glycols may be used, or two or more kinds may be mixed or copolymerized. Among these, PTMG or modified PTMG is preferable.

  Examples of the diisocyanate include aromatic diisocyanates such as diphenylmethane diisocyanate (hereinafter abbreviated as MDI), tolylene diisocyanate, 1,4-diisocyanate benzene, xylylene diisocyanate, and 2,6-naphthalene diisocyanate. Suitable for synthesizing high polyurethane. Further, as the alicyclic diisocyanate, for example, methylene bis (cyclohexyl isocyanate), isophorone diisocyanate, methylcyclohexane-2,4-diisocyanate, methylcyclohexane-2,6-diisocyanate, cyclohexane-1,4-diisocyanate, hexahydroxylylene diisocyanate, hexa Hydrotolylene diisocyanate, octahydro-1,5-naphthalene diisocyanate and the like are preferable. In addition, aliphatic diisocyanates can be used effectively especially when suppressing yellowing of polyurethane yarns. And these diisocyanates may be used independently and may use 2 or more types together.

  Furthermore, a polyfunctional active hydrogen compound is used as the chain extender. For example, ethylenediamine, 1,2-propylenediamine, hexamethylenediamine, xylylenediamine, 4,4′-diphenylmethanediamine, hydrazine, 1,4- It is preferable to use one kind of diaminopiperazine, ethylene glycol, 1,4-butanediol, 1,6-hexanediol, water, or a mixture of two or more thereof. If desired, these compounds may be used in combination with a small amount of a terminator such as monoamine or monoalcohol.

  The polymer containing a sulfonic acid group contained in the polyurethane elastic yarn is not particularly limited as long as it is a compound obtained by polymerizing a compound having a sulfonic acid group as a monomer, and only a compound having a sulfonic acid group as a monomer is used. It may also be a copolymer containing other monomers. From the viewpoint of obtaining a polyurethane yarn having high chemical resistance and high tensile elongation, the molar concentration of the monomer having a sulfonic acid group is preferably 5 mol% or more.

  Examples of the polymer containing a sulfonic acid group include formaldehyde condensation polymer of benzenesulfonic acid, formaldehyde condensation polymer of phenolsulfonic acid, formaldehyde condensation polymer of phenolsulfonic acid and cresol, and addition of ethylenesulfonic acid and styrene. Addition polymer of propylenesulfonic acid and styrene, addition polymer of styrenesulfonic acid and styrene, addition polymer of benzenesulfonic acid and divinylbenzene, addition polymer of phenolsulfonic acid and divinylbenzene, benzenesulfonic acid and divinyl Benzenesulfonic acid addition polymer, phenolsulfonic acid and divinylbenzenesulfonic acid addition polymer, benzenesulfonic acid and divinylsulfone addition polymer, phenolsulfonic acid and divinylsulfone addition polymer, benzene Formaldehyde condensation polymer of phonic acid and 4,2'-dihydroxydiphenylsulfone, formaldehyde condensation polymer of phenolsulfonic acid and 4,2'-dihydroxydiphenylsulfone, formaldehyde condensation of benzenesulfonic acid and 4,4'-dihydroxydiphenylsulfone Examples thereof include a polymer, a formaldehyde condensation polymer of phenolsulfonic acid and 4,4′-dihydroxydiphenylsulfone, and the like.

  The polyurethane-based elastic fibers include, for example, 2,6-ditetrabutylparacresol, an antioxidant such as phosphite, a light or ultraviolet absorber such as hydroxybenzophenone or hydroxybenzothiazole, Various stabilizers and pigments such as gas yellowing and deterioration preventing agents such as 1-dialkyl-substituted semicarbazide and dithiocarbamate, or white pigments such as titanium oxide and zinc oxide may be contained.

  The knitted fabric using only the polyurethane-based elastic fibers may be either a weft knitted fabric or a warp knitted fabric. A circular knitted fabric is used for the weft knitted fabric, and a tricot fabric or a raschel fabric is used for the warp knitted fabric. It is preferable. For example, a knitting machine for knitting a circular knitted fabric is not limited to a specific one, but a double circular knitting machine capable of knitting double-sided knitting is preferable. For example, a double circular knitting machine having a diameter of 20 inches or more, more preferably 33 inches or more. Is used. In this case, the knitting of the knitted fabric is not limited to a specific condition. For example, the yarn feeding tension is set to 1 to 10 g, more preferably 2 to 5 g, and the knitting is performed at 10 gauge or more, more preferably at 22 gauge or more. Is done.

  The circular knitted fabric is not limited to a specific knitting structure, but at least one of knitting yarns in which one or more knitting yarns are knitted only with dial needles and knitting yarns knitted only with cylinder needles. A circular knitted fabric is preferable because the knitting yarns are easily constrained to each other, and the occurrence of so-called “scratch marks” and “runs” is favorably reduced. Specific examples of such a knitting structure include a mock Milan rib (commonly known as a punch) structure shown in FIG. 1 and a mock loady (commonly known as a picket) structure as illustrated in FIG. 2, a mock royal interlock, a cross-miss interlock, Examples include knitting structures such as punch Rome, deformed punch, and well triple.

  The cationic dye used for the above dyeing is not limited to a specific one, and any commercially available cationic dye may be used, either a regular type (common name: raw cation) or a dispersion type. For example, kayakril, kayakryl ED (manufactured by Nippon Kayaku Co., Ltd.), Nichiron (manufactured by Nissei Kasei Co., Ltd.), Astrazon (manufactured by Daistar Co., Ltd.) and the like can be mentioned.

  In addition, as ancillary processing in the above dyeing treatment, antifouling processing, antibacterial processing, deodorization processing, deodorization processing, sweat absorption processing, moisture absorption processing, ultraviolet absorption processing, weight reduction processing, etc. may be performed, and further post processing For example, calendering, embossing, wrinkling, raising, opal, and bonding may be performed.

  The knitted fabric dyed by the above dyeing method has excellent stretchability, dimensional stability, fit to the skin, excellent strength retention, and rich design, so it can be used alone or in other ways. Elastic clothing such as fitness wear, leotards, spats, legwear, innerwear, sportswear, swimwear, etc. and non-slip tape, waistband, underwear tape, etc. It is preferably used for materials.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.
In addition, the characteristic of each Example was measured with the following measuring method.
(1) Stress at 200% elongation Tested according to the measurement method prescribed in 8.16.3 B method (elongation force at constant elongation of knitted fabric) of JIS L 1096: 2010 (fabric and knitted fabric testing method) Three test pieces each having a width of 2.54 cm and a distance of 10 cm between the grips are taken in the wale direction (vertical direction) and the course direction (horizontal direction), and the tensile speed is measured using a constant speed extension type tensile tester with a self-recording device. The stress at the time of 200% elongation was measured at 10 cm / min, and the average value of three sheets for each of the wale direction and the course direction was obtained.

(2) Dimensional change rate According to JIS L 1096: 2010 (fabric and knitted fabric test method), test method according to G method (household electric washing machine method) specified in 8.39 (dimensional change) The dimensional change rate of the ground was measured. Specifically, two test pieces of about 300 mm × 300 mm are collected, and three pairs of marks are attached at intervals of 200 mm in the wale direction and the course direction, respectively, and used as the measurement reference length (L1) before washing. After washing the ground, it was naturally dried by screen drying. And after drying, after leaving it to stand in a test room in a standard state for 4 hours or more, the average value (L2) of each of the three measured lengths in the wale and course directions is obtained, and the formula: (L2-L1) × 100 / L1 The dimensional change rate was calculated.

(3) Dye fastness The dye fastness to washing was measured according to method A-2 of the type of test specified in JIS L 0844: 2005. The dyeing fastness to sweat was measured in accordance with JIS L 0848: 2004. Furthermore, the dyeing fastness to water was measured in accordance with JIS L 0846: 2004. In either case, the contaminating attached cloth was made of nylon for the first attached cloth and cotton for the second attached cloth.

(4) Burst strength Measured in accordance with 8.18.1 A method (Murlen form method) of JIS L 1096: 2010 (fabric and knitted fabric test method). However, when the test piece was mounted on the tightening device, the test piece was stretched and mounted so as to extend 500% with respect to the area of the upper clamping plate.

(Example 1)
Using a 22 gauge, 33 inch double circular knitting machine, a circular knitted fabric with a mocked Milan rib (commonly called punch) structure shown in FIG. 1 was knitted. In this knitting structure, the knitting yarns (11 to 14) are supplied from the four yarn feeders (F1 to F4), respectively, but the knitting yarn supplied from the first yarn feeder (F1) and the second yarn feeder (F2). The yarn (11, 12) is knit alternately with the dial needle (D) and the cylinder needle (C), and the knitting yarn (13) supplied from the third yarn feeder (F3) is knit only with the dial needle (D). The knitting yarn (14) supplied from the fourth yarn feeder (F4) is knitted only with the cylinder needle (C).

  All of the above four yarn feeders (F1 to F4) are supplied with 78 dtex of polyurethane elastic fiber (trade name LYCRA T-909B, manufactured by Toray Operontex Co., Ltd.), and consists only of polyurethane elastic fiber. A circular knitted fabric was obtained.

  Next, this circular knitted fabric was dyed with a cationic dye (cationic dye manufactured by Nippon Kayaku Co., Ltd., trade name Kayacrill Black BS-ED). The concentration of the dye was 2% by mass with respect to the knitted fabric to be dyed, and dyed with a liquid dyeing machine at 100 ° C. for 30 minutes. Then, after performing normal soaping, washing with hot water, drying at 120 ° C., and finishing setting at 170 ° C. for 1 minute, a circular knitted fabric of Example 1 was obtained.

  When the characteristics of the circular knitted fabric of Example 1 were measured, the stress at 200% elongation was 280 cN in the wale direction (vertical direction), 490 cN in the course direction (horizontal direction), and the dimensional change rate was in the wale direction. -0.3% and the course direction was -0.1%. In addition, the circular knitted fabric of Example 1 was free from sink marks and runs, had excellent stretchability, dimensional stability, fit to the skin, and was well dyed.

(Example 2)
Using a 36 gauge, 34 inch double circular knitting machine, the organization chart knit a circular knitted fabric of mockrody (commonly called picket) organization shown in FIG. In this knitting structure, knitting yarns (11 to 16) are supplied from six yarn feeders (F1 to F6), respectively, but the knitting yarns supplied from the first yarn feeder (F1) and the fourth yarn feeder (F4). (11 ・ 14) is knitted with dial needle (D) and cylinder needle (C) alternately, and knitting yarn (12 ・ 15) supplied from the 2nd yarn feeder (F2) and 5th yarn feeder (F5) Is knitted only with the cylinder needle (C), and the knitting yarns (13, 16) supplied from the third yarn feeder (F3) and the sixth yarn feeder (F6) are knitted only with the dial needle (D).

  All of the above six yarn feeders (F1 to F6) are supplied with 44 dtex of polyurethane elastic fiber (trade name LYCRA T-909B, manufactured by Toray Operontex Co., Ltd.), and consists only of polyurethane elastic fiber. A circular knitted fabric was obtained.

  Next, this circular knitted fabric was dyed with the same dye as in Example 1 above. The dye concentration, the dyeing machine used, and the dyeing time were the same as in Example 1, but the dyeing temperature was 120 ° C. Thereafter, as in Example 1, normal soaping was performed, followed by washing with hot water, and then drying and finishing set were performed under the same conditions to obtain a circular knitted fabric of Example 2.

  When the characteristics of the circular knitted fabric of Example 2 were measured, the stress at 200% elongation was 220 cN in the wale direction and 350 cN in the course direction, and the dimensional change rate was -0.8% in the wale direction. The direction was -0.5%. The circular knitted fabric of this Example 2 also did not generate sink marks or runs, had excellent stretchability, dimensional stability, fit to the skin, and was well dyed.

(Example 3)
In the same manner as in Example 1, a 22 gauge, 33 inch double circular knitting machine was used, and a circular knitted fabric having a smooth (commonly called interlock) structure shown in FIG. 3 was knitted. In this knitting structure, knitting yarns (11, 12) are supplied from two yarn feeders (F1, F2), respectively, but each knitting yarn (11, 12) is dial needle (D) and cylinder needle. Knit alternately with (C).

Each of the two yarn feeders (F1, F2) was supplied with the same polyurethane elastic fiber 44dtex as in Example 2 to obtain a circular knitted fabric made only of the polyurethane elastic fiber.
Next, this circular knitted fabric was dyed under the same conditions using the same dye and dyeing machine as in Example 1 above, soaped, washed with water and dried under the same conditions, and finished and set under the same conditions. 3 circular knitted fabric.

  When each characteristic was measured for the circular knitted fabric of this Example 3, the stress at the time of 200% elongation was 220 cN in the wale direction and 150 cN in the course direction, and the dimensional change rate was -0.6% in the wale direction. The course direction was −1.0%, had excellent stretchability, dimensional stability, fit to the skin, and was well dyed. However, since the knitting structure is different from Example 1 and Example 2, sink marks and runs are likely to occur to some extent, and the fabric quality is slightly inferior.

Example 4
Using the circular knitted fabric knitted in Example 1 above, using the same dye and dyeing machine as in Example 1, dyeing under the same conditions as in Example 2, soaping, washing with hot water and drying under the same conditions, The finishing set was omitted, and a circular knitted fabric of Example 4 was obtained.

  When the characteristics of the circular knitted fabric of Example 4 were measured, as in Example 1, the stress at 200% elongation was 271 cN in the wale direction and 485 cN in the course direction, and the dimensional change rate was in the wale direction. It was -0.4%, the course direction was -0.2%, had excellent stretchability, dimensional stability, fit to the skin, and was dyed well. However, in Example 4, since the knitted fabric was not heat-set in the dyeing process, sink marks and runs were likely to occur to some extent, and the fabric quality was slightly inferior.

  Next, dyeing fastness was measured about said Examples 1-4. The results are shown in Table 1 for comparison of measurement results in FIG. As is apparent from the measurement results, each of the circular knitted fabrics of the examples in which the polyurethane elastic fibers are dyed with a cationic dye exhibits high dyeing fastness in both discoloration and contamination.

(Example 5)
Using the circular knitted fabric knitted in Example 1 above, dyeing is performed under the same dyeing conditions as in Example 1 except that the dyeing temperature is 85 ° C., and then soaping, hot water washing, drying and finishing set are performed under the same conditions. A circular knitted fabric of Example 5 was obtained.
When the characteristics of the circular knitted fabric of Example 5 were measured, the stress at 200% elongation was 276 cN in the wale direction and 486 cN in the course direction, and the dimensional change rate was -0.4% in the wale direction. The direction was -0.3%. The circular knitted fabric of this Example 5 was free from sink marks and runs, had excellent stretchability, dimensional stability, fit to the skin, and was well dyed.

(Example 6)
Using the circular knitted fabric knitted in Example 2 above, dyeing is performed under the same dyeing conditions as in Example 1 except that the dyeing temperature is 85 ° C., and then soaping, hot water washing, drying and finishing set are performed under the same conditions. A circular knitted fabric of Example 6 was obtained.
When the characteristics of the circular knitted fabric of Example 6 were measured, the stress at the time of 200% elongation was 210 cN in the wale direction and 330 cN in the course direction, and the dimensional change rate was -1.0% in the wale direction. The direction was -0.8%. The circular knitted fabric of this Example 6 was free from sink marks and runs, had excellent extensibility, dimensional stability, fit to the skin, and was well dyed.

(Example 7)
Using the circular knitted fabric knitted in Example 3 above, dyeing is performed under the same dyeing conditions as in Example 1 except that the dyeing temperature is 85 ° C., and then soaping, hot water washing, drying and finishing set are performed under the same conditions. A circular knitted fabric of Example 7 was obtained.
When each characteristic was measured for the circular knitted fabric of this Example 7, the stress at the time of 200% elongation was 200 cN in the wale direction and 140 cN in the course direction, and the dimensional change rate was −0.8% in the wale direction. The course direction was -1.2%, had excellent extensibility, dimensional stability, fit to the skin, and was well dyed. However, sink marks and orchids are likely to occur to some extent, and the fabric quality is slightly inferior.

(Example 8)
Using the circular knitted fabric knitted in Example 1 above, dyeing was performed under the same dyeing conditions as in Example 1 except that the dyeing temperature was 85 ° C., and then soaping, washing with hot water and drying were performed under the same conditions. The round knitted fabric of Example 8 was obtained by omitting the finishing set.
When the characteristics of the circular knitted fabric of Example 8 were measured, the stress at 200% elongation was 260 cN in the wale direction and 470 cN in the course direction, and the dimensional change rate was -0.6% in the wale direction. The direction was -0.4%, and it had excellent extensibility, dimensional stability, fit to the skin, and was well dyed. However, sink marks and orchids are likely to occur to some extent, and the fabric quality is slightly inferior.

Example 9
Using the circular knitted fabric knitted in Example 1 above, dyeing was performed under the same dyeing conditions as Example 1 except that the dyeing temperature was 50 ° C., and then soaping, hot water washing and drying were performed under the same conditions. A round knitted fabric of Example 9 was obtained by omitting the finishing set.
When the characteristics of the circular knitted fabric of Example 9 were measured, the stress at 200% elongation was 250 cN in the wale direction and 460 cN in the course direction, and the dimensional change rate was -0.8% in the wale direction. The direction was -0.6% and had excellent extensibility, dimensional stability, and fit to the skin. However, sink marks and orchids are likely to occur to some extent, and the fabric quality is slightly inferior.

(Example 10)
Using the circular knitted fabric knitted in Example 1 above, dyeing was performed under the same dyeing conditions as Example 1 except that the dyeing temperature was 30 ° C., and then soaping, washing with hot water and drying were performed under the same conditions. A round knitted fabric of Example 10 was obtained by omitting the finishing set.
When the characteristics of the circular knitted fabric of Example 10 were measured, the stress at 200% elongation was 230 cN in the wale direction and 450 cN in the course direction, and the dimensional change rate was -1.0% in the wale direction. The direction was -0.8% and had excellent extensibility, dimensional stability, and fit to the skin. However, sink marks and orchids are likely to occur to some extent, and the fabric quality is slightly inferior.

  Next, burst strength was measured about said Examples 1-10. The results are shown in Table 2 for comparison of measurement results in FIG. As is apparent from the measurement results, Examples 5 to 10 having a lower dyeing temperature than Examples 1 to 4 were excellent in bursting strength in any knitted structure.

  The method for dyeing a knitted fabric made of polyurethane-based elastic fibers, the knitted fabric dyed by the method, and the stretch garment and the stretch garment material using the knitted fabric described in the above embodiment are the technical aspects of the present invention. It is illustrated to embody the idea, and the material and fineness of polyurethane elastic fiber, the type of knitting machine, the number of gauges and the diameter, the knitting structure, the type and concentration of dye, heating conditions, heat setting conditions, etc. The present invention is not limited to the above embodiments and examples, and various modifications can be made within the scope of the claims of the present invention.

For example, in the above examples, a specific cationic dye manufactured by Nippon Kayaku Co., Ltd. was used as the dye, but other cationic dyes may be used in the present invention, and the concentration, dyeing temperature, etc. It is set as appropriate according to the knitted fabric.
In the above-described examples, the description has been made in connection with the case of dyeing the circular knitted fabric after knitting, but in the present invention, the yarn of the polyurethane elastic fiber before knitting may be dyed, Further, it may be dyed both before and after knitting.

  In Examples 1 to 3 and Examples 5 to 7, the finishing set was applied after the dyeing process. However, in the present invention, the finishing set is performed before the dyeing process, or only the preset is applied. Also good. However, since the knitted fabric made only of the polyurethane elastic fiber of the present invention is excellent in dimensional stability and does not generate wrinkles, for example, as in Example 4 above, these heat sets are omitted. In this case, since the urethane fiber is not embrittled by heat, there is an advantage that more excellent stretchability and strong holding ability can be exhibited.

  In the above embodiment, the circular knitted fabric whose knitting structure is mock Milan rib, mock loddy, or smooth is described. However, the knitted fabric dyed by the dyeing method of the present invention is only a knitting yarn made of polyurethane elastic fibers. As long as the knitted fabric is knitted, it may be other knitted fabrics, and may be a warp knitted fabric such as a tricot fabric.

  The polyurethane-based elastic fiber of the present invention may be a polyurethane-based elastic fiber different from the product name LYCRA T-909B manufactured by Toray Operontex Co., Ltd. used in the above examples, and has a fineness other than 78 dtex and 44 dtex. Needless to say, yarn may be used.

  The knitted fabric dyed by the dyeing method of the present invention and the stretch garment and stretch garment material using the knitted fabric have excellent stretchability, dimensional stability, fit to the skin, and excellent strength retention. In addition, because it is rich in design, it is particularly suitable for elastic clothing such as legwear, innerwear, sportswear, swimwear, and elastic clothing materials such as anti-slip tape, waistband, and underwear tape. It can also be suitably used as other stretchable clothing and stretchable materials other than clothing.

11-16 ... Knitting yarn C ... Cylinder needle D ... Dial needle
F1-F6 ... Yarn feeder

Claims (1)

A method for dyeing a knitted fabric knitted only with a knitting yarn comprising a polyurethane elastic fiber, wherein the polyurethane elastic fiber is obtained mainly by a reaction of a polymer diol, a diisocyanate and a chain extender. And containing a polymer containing a sulfonic acid group, using a cationic dye at least at least either before or after the above knitting without performing a presetting before dyeing , at 30 ° C. A method for dyeing a knitted fabric comprising polyurethane elastic fibers, characterized by dyeing at 130 ° C. or lower.

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