JP2010255130A - Method for producing dyed water-absorbing and quick-drying woven and knitted fabrics - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a dyed water-absorbing and quick-drying woven or knitted fabric, wherein a dyed woven or knitted fabric made of a polyester fiber is excellent in washing durability of water-absorbing and quick-drying performance, retains a texture of firm feeling in spite of being soft, and has high color fastness and excellent wearing feeling. <P>SOLUTION: By the method for producing the dyed water-absorbing and quick-drying woven or knitted fabric, the woven or knitted fabric containing 20 wt.% or more of a sheath-core polyester fiber, which has one or more recessed parts in a single filament cross-section, contains 0.4-4.0 wt.% of a polyethylene glycol in the sheath part and has a weight ratio of the sheath part/core part of 20/80-50/50, is treated to reduce the weight by 5-15% using an alkali aqueous solution containing an EO addition alkyl benzyl dimethyl ammonium chloride at 100°C or less, is neutralized, and then is dyed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for producing a woven or knitted fabric containing polyester fibers and excellent in water absorption and quick drying.

  Various characteristics are required for clothing fabrics used for sports clothing, underwear, etc. Especially when worn, the fabric feels sticky when the entire fabric gets wet due to sweat, or sweat due to poor dryness. There is a need to improve comfort when wearing since it feels cold after being worn and feels uncomfortable.

  Conventionally, as a method for imparting water absorbency to a polyester fiber, a method of imparting a polymer having a hydrophilic group to the fiber by a padding method, an immersion method, or the like, or a method of imparting a monomer or polymer having a hydrophilic group to the fiber surface by graft polymerization Has been done. However, in these methods, the fiber has a high moisture retention ability, so that the quick-drying property is poor, there is a sticky feeling when sweating, and satisfactory wearing comfort cannot be obtained.

  In addition, as a method for chemically modifying the fiber itself, there is a method of spinning a polymer having a hydrophilic group and a polyester polymer. There are problems with management difficulty, low dyeing fastness, and texture. As a physical modification method of the fiber itself, there is a method of using a capillary phenomenon between the fibers by making the fiber cross section into a special shape, but in this method, the water absorption performance changes due to fluctuations in the weaving and knitting structure and basis weight, There is a problem that stable water absorption performance cannot be obtained.

  As a method of solving these problems, there is a method in which a specific continuous streak groove is formed on the fiber surface in the fiber axis direction, a space is provided inside the fiber, and a part of the space is communicated with the streak groove. It is disclosed in Document 1, Patent Document 2, and the like. However, in this method, although water absorption performance is improved, moisture is retained in the gap portion. Therefore, when worn, a phenomenon that the moisture retained in the void portion returns to the skin surface (so-called wet return phenomenon) occurs. There is a problem in that the comfort is poor and a high degree of weight reduction processing is required to form the gap, so that the texture is strong and the texture is not strong.

  Further, Patent Document 3 discloses a method in which fine grooves parallel to the fiber axis direction are formed on the fiber surface. However, with this method, although water absorption is obtained, since the fine grooves are arranged in a specific size and the number is small, the performance of diffusing the absorbed water is extremely poor and the weight loss rate is high. There is a problem that a certain texture cannot be obtained.

  Furthermore, Patent Document 4 discloses a method for imparting a hydrophilic agent to a fiber having a large number of streak-like holes oriented in the fiber axis direction on the fiber surface. However, this method has a problem that although water absorption is improved, water absorption performance is lowered by washing. In particular, there is a problem that the performance of the hydrophilic agent is greatly deteriorated by high-temperature washing, and a texture with a firm feeling cannot be obtained due to the influence of the hydrophilic agent application.

  Patent Document 5 discloses a method for obtaining a water-absorbing quick-drying woven or knitted fabric by treating polyester fibers having a sheath-core structure with a W-shaped cross section with an alkaline aqueous solution containing alkylbenzylammonium chloride. However, with this method, although a woven or knitted fabric with high water absorption and quick drying performance can be obtained, oily spots and dye stains are likely to occur during dyeing, and a complicated washing step is required after processing, resulting in poor industrial productivity. There is.

  Therefore, the above problems can be solved, and not only normal laundry at home, but also high temperature laundry at home in Europe and the United States and high temperature laundry as represented by linen supply, sufficient water absorption A method for easily producing a polyester woven dyed article having excellent water-absorbing and quick-drying performance and having a soft texture but a firm feel and excellent dyeing fastness without requiring complicated processes. Longed for.

Japanese Patent No. 2688794 Japanese Patent No. 3293704 JP 2003-166125 A Japanese Patent Laying-Open No. 2005-200799 JP 2008-150728 A

  An object of the present invention is to provide a woven or knitted fabric that includes polyester fibers and is excellent in water absorption and quick drying. In particular, the dyed water-absorbing quick-sensitive woven or knitted fabric is superior in durability of water-absorbing and quick-drying performance due to high-temperature washing, retains a soft and soft texture, has excellent dyeing fastness, and is comfortable to wear. An object is to provide a manufacturing method.

As a result of intensive studies to solve the above problems, the inventor of the present invention has a specific amount of polyethylene glycol in the sheath portion of the polyester fiber in the woven or knitted fabric including the polyester fiber having a sheath core structure with an irregular cross section having one or more recesses. It is found that an excellent water-absorbing quick-drying woven or knitted fabric can be obtained by forming specific streak grooves along the fiber axis direction of the polyester fiber surface by subjecting to alkali weight reduction treatment under specific conditions. It came to make this invention.
That is, the present invention is as follows.

1. A woven or knitted fabric containing 20 wt% or more of a sheath-core type polyester fiber that satisfies the following requirements (1) to (3) is used at a temperature of 100 ° C. or less using an alkaline aqueous solution containing EO-added alkylbenzyldimethylammonium chloride. A process for producing a dyed water-absorbing quick-drying woven or knitted fabric, characterized by neutralizing and then dyeing after 5 to 15% reduction processing.
(1) A modified cross-section fiber having one or more recesses in a single yarn cross section.
(2) The sheath part contains 0.4 to 4.0 wt% of polyethylene glycol.
(3) The weight ratio of the sheath / core is 20/80 to 50/50.

  The water-absorbing quick-drying woven or knitted fabric obtained by the production method of the present invention has excellent water absorption and quick-drying properties, and has no stickiness or cold feeling even when the entire fabric is wet due to sweat, and has excellent comfort when worn. ing.

It is a figure which shows the relationship between the specific surface area and water absorption quick-drying property in the sheath core type | mold polyester fiber used for this invention. In the single yarn of the sheath-core type polyester fiber used for this invention, it is a figure which shows typically an example of a W-shaped flat cross section.

The present invention will be described in detail below.
The present invention relates to a method for producing a dyed water-absorbing quick-drying woven or knitted fabric including a sheath-core polyester fiber having an odd-shaped cross section having one or more recesses and a sheath-core structure, and is specific to the sheath portion of the sheath-core polyester fiber A method for producing a water-absorbing quick-drying woven or knitted fabric in which a specific streak groove parallel to the fiber axis direction is formed on the surface of a sheath-core polyester fiber by containing an amount of polyethylene glycol and subjecting to alkali weight reduction treatment under specific conditions It is.

  Unlike conventional products, the water-absorbing quick-drying woven or knitted fabric in the present invention does not particularly use a hydrophilic agent such as a known hydrophilic polyester resin, hydrophilic polyamide resin, hydrophilic polyurethane resin, or hydrophilic polyacrylic resin in the dyeing process. Even in this case, excellent water-absorbing quick-drying property and washing durability can be obtained.

  Generally, in order to feel pleasant even when sweating when wearing clothes, it is necessary for the fabric to have the ability to absorb moisture. However, when sweat is absorbed, moisture is retained only in the part that touches the sweat. Therefore, when the dryness of the fabric is poor, the sticky feeling is not eliminated and the cloth feels uncomfortable. In order to eliminate this sticky feeling, it is necessary to accelerate the drying by quickly diffusing the absorbed moisture. As described above, in order to improve the comfort when sweating, two functions are necessary at the same time: a function of quickly absorbing and transporting moisture and a function of quickly diffusing the absorbed moisture.

  In order to exhibit these two functions at the same time, in the present invention, it is important to mix two kinds of long streak grooves A and short streak grooves B. In order to transport the sucked moisture, the strip-shaped groove A having an elongated shape is effective, and in order to maximize this effect, the stripe-shaped groove A is formed in the recess of the recess of the single yarn cross section or in the vicinity thereof. Preferably it is present. Due to this presence, the effect of quickly sucking and transporting moisture (pumping effect) is exhibited as if it were an action of a spider.

  On the other hand, the short streak-like grooves B are present around the recesses, so that the moisture can be quickly diffused and spread throughout the knitted and knitted fabric as if it were an action of a capillary tube. To do. In order to exhibit the above effect more effectively, it is preferable that 20 or more streak-like grooves B are formed on average in a length of 30 μm in the fiber axis direction.

  In the present invention, in order to obtain a water-absorbing quick-drying performance excellent in washing durability performance, only one of the streak-like grooves A or the streak-like grooves B lacks the ability to transport the absorbed water, or the water-absorbing and diffusing performance. It is missing. Therefore, it is important to use a sheath-core type polyester fiber having an atypical cross section in which the streak-like groove A and the streak-like groove B are mixed around the depressions of the recesses. It can form on the surface of a fiber by carrying out alkali weight reduction process on specific conditions.

  In the present invention, it is essential that the sheath part of the sheath-core type polyester fiber contains a polyethylene glycol that is incompatible with the polyester, and the number average molecular weight of the polyethylene glycol is preferably 4,000 to 50,000.

  Moreover, in order to form the streak-like groove A and the streak-like groove B in the recess of the recess, or around the recess, the sheath-core polyester fiber has an atypical cross section having one or more recesses in the single yarn cross section, and the sheath part / It is essential that the weight ratio of the core is 20/80 to 50/50. This further enhances the synergistic effect of the single yarn shape having one or more recesses and the streaky grooves A and B of the surface layer, and has excellent water absorption that has never been achieved without the addition of a hydrophilizing agent. Quick drying performance and washing durability can be exhibited.

In the present invention, the polyester fiber refers to a fiber composed of a polymer in which at least 90 mol% is ethylene terephthalate.
Therefore, the fiber which consists of a polyethylene terephthalate in which the total amount of another acid component and / or glycol component contained in the range of 10 mol% or less is included as a 3rd component. For example, the third component includes polyethylene glycol, adipic acid, isophthalic acid, isophthalic acid containing a sulfonic acid metal salt, and the like.

  Polyester fibers also include trimethyl phosphate, triethyl phosphate, tributyl phosphate, triphenyl phosphate, trimethyl phosphite, triethyl phosphite, triphenyl phosphite, phosphoric acid, phosphorous acid, etc. to improve hue and heat resistance May be added in the range of 0.001 to 2 wt%, preferably 0.02 to 1 wt%, with respect to the polyester fiber. Further, a cobalt compound such as cobalt acetate and cobalt formate and a commercially available fluorescent whitening agent may be added to the polyester fiber in a range of 0.0001 to 0.1 wt% with respect to the polyester fiber as a coloring inhibitor. Good.

  In the present invention, the sheath-core polyester fiber is a modified cross-section fiber having one or more recesses in the single yarn cross section, and the weight ratio of the sheath portion / core portion is 20/80 to 50/50. When the weight ratio of the sheath / core is 20/80 to 50/50, it is preferable for forming the elongated strip-like grooves (strip-like grooves A, stripe-like grooves B) continuous in the recesses or around the recesses. . By forming a continuous elongated strip-like groove around the recess or around the recess, the pumping effect related to moisture transport is enhanced. In addition, when the weight ratio of the sheath portion / core portion is within the above range, a decrease in the yarn strength due to the alkali weight loss treatment is suppressed.

  If the sheath / core weight ratio is smaller than 20/80, the spinning yield will be poor and the dispersion of polyethylene glycol in the polyester will be poor. Long continuous streak becomes difficult to obtain. On the contrary, when the weight ratio of the sheath part / core part exceeds 50/50, the decrease in the raw yarn strength due to the alkali weight loss treatment increases, and the burst strength of the woven or knitted fabric decreases. From the viewpoints of the productivity of raw yarn, the formation of streak-like grooves on the fiber surface by the alkali weight loss treatment, and the physical properties of the fabric, the weight ratio of the sheath / core is preferably 25/75 to 40/60.

  In the present invention, the sheath core type polyester fiber having an irregular cross section having one or more recesses in the single yarn cross section is subjected to an alkali weight reduction treatment, so that a large number of streak grooves A and streak grooves along the fiber axis direction are formed on the fiber surface. In order to form B, it is essential for the sheath to contain polyester glycol and an incompatible polyethylene glycol.

  The polyethylene glycol to be used preferably has a number average molecular weight of 4,000 to 50,000, more preferably a number average molecular weight of 6,000 to 30,000. If the number average molecular weight is less than 4000, the kneadability with the polyester is too good, and there is a tendency that it is difficult to take a streak-like dispersion state in the polyester matrix. There is a tendency for the formation of long, continuous streak grooves to be insufficient. On the other hand, when the number average molecular weight exceeds 50,000, the melt viscosity is high, so that it is difficult to melt and add to the polyester, and the yarn-making property tends to be poor.

The polyethylene glycol content in the sheath is preferably 0.4 to 4.0 wt%. When the content is in the above range, the recess or the streak groove is sufficiently formed in the periphery thereof by the alkali weight reduction treatment, so that excellent water absorption quick drying performance and washing durability can be obtained. The sheath-core type polyester fiber having a different cross-sectional shape having at least one can be spun at a good yield, and a textured feel fiber can be obtained.
The content of polyethylene glycol is preferably in the range of 0.1 to 1.0 wt%, more preferably 0.2 to 0.9 wt%, with respect to the sheath-core polyester fiber.

In the present invention, the method for mixing polyethylene glycol with polyester is not particularly limited, and any conventionally known method such as mixing at the polymerization stage, chip blending, melt kneading, etc. can be employed.
In the present invention, in the sheath-core polyester fiber, long streak-like grooves A and short streak-like grooves B are mixed along the fiber axis direction.

  The streak-like groove A has a length of 30 μm or more, preferably 50 to 2000 μm. It is preferable that one or more streak-like grooves A are formed in or around the recess, and the ratio P (P = L / D) of the length (L) to the width (D) of the streak-like groove is 75. It is preferable that it is above, More preferably, P is 100-300. By having the streak-like groove A as described above, the function of quickly absorbing sweat and transporting the absorbed moisture, especially the effect of wrinkles, is maximized. Since it does not stick and does not feel sticky, it is comfortable to wear and provides excellent comfort.

  The streak-like groove B has a length of 15 μm or less, preferably 10 μm or less. The streak-like groove B preferably has a P of 50 or less, more preferably 20 to 50, and is preferably formed in an average of 20 or more in a length of 30 μm in the fiber axis direction. Preferably it is the range of 20-100 pieces. By having the streak-like grooves B as described above, the function of diffusing the absorbed moisture is exhibited to the maximum, and the evaporation of moisture is promoted.

  Therefore, by mixing the two types of the streak groove A and the streak groove B, when wearing clothes, when sweating, it does not become sticky, a smooth feeling is obtained, and the evaporation of sweat is promoted to dry quickly. Therefore, wearing comfort is improved, and the presence of the streak-like groove A and streak-like groove B around the recess or the recess makes the touch even better, and the effect is retained even after repeated washing. It is.

  Even if P is 75 or more in the streak-like groove A, if the length is less than 30 μm, the force to quickly absorb and transport the moisture is insufficient, and the pumping effect is weak, so that the wrinkle effect is sufficiently exerted Can not. On the other hand, when P is less than 75, since the width of the streak groove is relatively wide, the water retention power tends to be strong, and the spin-off dehydration rate when dehydrated is poor, and the drying property tends to deteriorate. If this is 30 μm or more, such a negative factor is considerably reduced.

  In the streak-like groove B, even if P is less than 50, when the number in the length of 30 μm in the fiber axis direction is less than 20, the diffusion action of the absorbed water tends to be weak, and the number is 20 Even if the number is more than 50, when P is 50 or more, although the diffusibility is increased, the specific surface area is increased, and the water-absorbing quick drying property tends to be decreased.

  For this reason, in the present invention, it is important to mix and form the streak-like grooves A and the streak-like grooves B. In order to mix such a streak-like groove A and streak-like groove B, a sheath-core type polyester fiber having a modified cross section containing polyethylene glycol in the sheath and having one or more recesses in the single yarn cross section will be described later. It is important to reduce the amount by 5 to 15% by alkali weight reduction treatment.

  The formation state of the streak-like groove can be controlled by the conditions of the alkali weight loss treatment, the structure of the atypical cross section, the weight ratio of the sheath / core, the type and amount of polyethylene glycol contained in the sheath. In particular, when a hydrolysis accelerator having a high affinity for polyester fibers is used as an auxiliary agent during the alkali weight reduction treatment, long streak grooves A are mainly formed in the recesses and short streak grooves B are formed around the recesses. The tendency becomes remarkable.

  Further, when the weight loss rate by the alkali weight loss treatment is less than 5%, not only the length of the continuous long streak groove A formed around the recess or the periphery of the recess becomes less than 30 μm, but P becomes less than 75, and the absorbed moisture In addition, since a predetermined number of short streak grooves B are not formed, the water diffusibility is poor and the water absorption and quick drying performance is lowered.

  On the other hand, when the weight loss rate exceeds 15%, the long streak groove A and the short streak groove B both have a large groove width and a specific surface area as described in the examples. As a result, the water retention capacity is increased and the diffusibility of the absorbed water is deteriorated. As a result, since the water retaining ability is high, there is a problem that when washing is actually performed, the spin-off dewatering rate is deteriorated and the drying speed is slow in the dewatering after washing.

FIG. 1 shows the relationship between the specific surface area and the water-absorbing quick-drying property based on the example of the present invention. The specific surface area has an appropriate range, and the specific surface area is preferably in the range of 0.3 to 0.6 m ² / g, more preferably 0.4 to 0.5 m ² / g. When the specific surface area is in the above range, excellent water-absorbing quick-drying properties are obtained, and the effects of the present invention are effectively exhibited.

  In order to control the shape (size) of the streak groove A and streak groove B on the fiber surface, the alkali concentration, the EO-added alkylbenzyldimethylammonium chloride concentration of the hydrolysis accelerator, the treatment temperature in the alkali weight loss treatment It is possible by appropriately selecting the processing time and the like. Specifically, in the alkali weight loss treatment, the alkali concentration is 2 to 8 g / liter, the EO-added alkylbenzyldimethylammonium chloride concentration is 0.5 to 4 g / liter, the treatment temperature is 85 to 100 ° C., and the treatment time is 5 to 5 ° C. 60 minutes is preferred.

  When the shape of the streak-like groove A and the streak-like groove B is within the range defined by the present invention, excellent water-absorbing quick-drying property and washing durability can be obtained. In particular, the water-absorbing and quick-drying washing durability is implemented not only in the durability of household washing from room temperature to lukewarm water, but also in hot washing at 60 ° C. or higher and linen supply as is done in European and American homes. Excellent durability in high temperature washing.

In the water-absorbing quick-drying woven or knitted fabric of the present invention, the water drop disappearance time after washing 30 times at 80 ° C. is preferably 10 seconds or less, more preferably 5 seconds or less.
In the water-absorbing quick-drying woven or knitted fabric of the present invention, the dehydration drying property after washing 30 times at 80 ° C. is preferably 20 minutes or less, more preferably 18 minutes or less.
In the water-absorbing quick-drying woven or knitted fabric of the present invention, the water-absorbing diffusion area after washing 30 times at 80 ° C. is 10 cm ² or more, more preferably 12 cm ² or more.

  By mixing the streak-like groove A and the streak-like groove B around the recesses or around the recesses, the water-absorbing quick-drying property and the washing durability thereof are improved. The reason is that the streak-like grooves are not present over the entire fiber surface, but are present in the recesses or the periphery of the recesses, so that the fiber surface is excellent in abrasion resistance. This is because both the streak-like grooves B are not fibrillated and the shape of the streak-like grooves is maintained without being damaged. As a result, it is considered that, due to the ridge structure of the streak-like grooves, the moisture transport ability and the water absorption and diffusion effect are hardly changed even after washing.

  In the present invention, the single yarn of the sheath-core type polyester fiber has a modified cross-sectional shape having one or more recesses. The irregular cross-sectional shape may be a polygonal shape such as an L shape, a T shape, a W shape, an M shape, a V shape, an X shape, a Y shape, a cross shape, or an eight leaf shape, or an irregular shape. Further, in order to further utilize the capillary phenomenon, the thread may have slits or fine holes with an angle. The number of recesses is, for example, 2 for the T type, 3 for the W type, and 4 for the X type.

  If the fiber has an atypical cross-sectional shape having one or more recesses, the recesses and protrusions of the fiber cross section are entangled and the fibers are easily joined to each other. It is formed and exhibits the effect of improving water absorption and water conductivity by vigorous capillary action.

  In the sheath-core type polyester fiber used in the present invention, the shape of the atypical cross section of the single yarn may be one having a flatness of 1.1 to 5 and having one or more recesses, or the opening angle of the recesses in the corrugated flat cross section Having at least one recess of 60 to 160 degrees is preferable. Among these, a W-shaped flat cross section having three concave portions in which the flatness of the single yarn is 2 to 5 and the opening angle of the concave portion is in the range of 100 to 150 degrees is preferable also from the hand surface. An example of a W-shaped flat cross section is shown in FIG.

  In the case of such a W-shaped flat cross section, the thicknesses of the three sheaths of the recesses may be not only uniform as shown in FIG. 2 but also non-uniform. In general, since the thickness of the recess tends to be thinner than other places, when the recess is relatively thin, continuous elongated stripe-like grooves such as stripe-like groove A and stripe-like groove B are formed. It is easier to form.

  In addition, when the cross-sectional shape of the single yarn is W-type, the flatness of the single yarn is increased to 3 to 5, and it is easy to obtain a soft texture although it is soft in the present invention. Furthermore, when the cross-sectional shape is W-shaped, the specific surface area is large, so the efficiency during the alkali weight reduction treatment is increased, and the streak-like grooves A and streak-like grooves B are easily formed around the recesses. The streak-like groove A and the streak-like groove B are preferably formed in all three of the recesses, but if they are present in at least one recess, the object of the present invention is sufficiently achieved.

  Although the fineness of the sheath-core type polyester fiber used for this invention is not specifically limited, It is preferable that a total fineness is 30-250 dtex. The form of the fiber may be long fiber or short fiber, and may be uniform or thick in the length direction. Examples of the form of the yarn on which the fiber is processed include, for example, spun yarn such as ring spun yarn, open-end spun yarn, air jet fine spun yarn, sweet-twisted yarn to high-twisted yarn, false twisted yarn (POY drawn false twisted yarn) Air injection processed yarn, indented processed yarn, knitted knitted yarn, and the like.

The woven or knitted fabric in the present invention contains 20% by weight or more of the sheath-core type polyester fiber. If the sheath-core polyester fiber is less than 20%, the washing durability of the water-absorbing quick-drying performance is deteriorated.
In addition, the woven or knitted fabric made of 100% sheath-core polyester fiber has excellent water absorption and diffusion performance, but there are problems such as sebum stains when worn, stains such as blemishes, stains when washing, etc. Since the water-holding power of the entire knitted fabric is increased, the water-absorbing and drying speed after washing is lowered, and a soft and firm texture cannot be obtained.

In the present invention, the upper limit of the content of the sheath-core type polyester fiber is preferably 60 wt% or less from the viewpoint of washing durability with water absorption and quick drying performance, drying speed in practical washing, cost, texture, and the like.
Although it does not specifically limit as another fiber mixed with the sheath core type polyester fiber used for this invention, For example, it is possible to mix a non-sheath core type polyester fiber, spandex, polyamide, a cellulose fiber, etc.

  Non-sheath core type polyester fibers that can be used in combination are preferably polyester multi-yarns, high-strength polyester yarns, easily dyeable polyester fibers, polytrimethylene terephthalate fibers, etc. Can be used. Among them, high-strength polyester yarns and polytrimethylene terephthalate fibers are particularly preferable mixed materials because the weight reduction rate due to alkali is extremely slow. This is because when these fibers are mixed, a streak-like groove can be preferentially formed on the surface of the sheath-core type polyester fiber used in the present invention by the alkali weight loss treatment.

In the present invention, the form of the mixed article of the sheath-core type polyester fiber and other fibers may be a yarn form or a woven or knitted form.
Examples of yarn forms include blended yarn (blended cotton, fleece blended, sliver blended, core yarn, silo span, silofill, hollow spindle, etc.), entangled blended yarn, twisted yarn, design twisted yarn, covering (single, double), composite temporary Examples include twisting (simultaneous false twisting, first twist false twisting), elongation difference false twisting, phase difference false twisting, mixed fiber after false twisting, and two-feed (simultaneous feed or feed difference) air injection machining.

  As an example of the form of the woven or knitted fabric, there is a general knitting knitting. For example, in the knitting, a method in which the fibers are aligned and fed, a double knitted fabric (for example, a double circular knitting machine, a double flat knitting) Machine, a double raschel warp knitting machine), and a method of supplying yarns by feeding or aligning the fibers on the front surface and / or back surface. In the cross weaving, one fiber is used as a warp and the other fiber is used as a weft. Alternatively, one to three warps and / or wefts are alternately warped or inserted, and a raised fabric. In the pile fabric, one fiber constitutes a ground structure and the other fiber constitutes a raised portion and / or a pile portion, and a woven fabric that forms a ground structure, a raised portion, etc. by mixing each fiber. . In addition, in the double woven fabric, a woven fabric in which the front surface and / or the back surface are configured by each fiber, a woven fabric configured by mixing each fiber, and the like can be given. Furthermore, the fibers may be combined and combined on a loom or knitting machine.

  In order to form the streak-like groove A and the streak-like groove B in the sheath-core type polyester fiber, prior to dyeing, the woven or knitted fabric containing the sheath-core type polyester fiber is reduced by 5 to 15% using an alkaline aqueous solution. Alkali weight loss treatment. The alkali weight loss treatment may be performed before or after the steps such as scouring, relaxing, and presetting. In the alkali weight loss treatment, hanging weight loss and batch weight loss using a liquid dyeing machine are preferable.

  In the present invention, it is important to form streak-like grooves at a reduced rate only on the fiber surface of the sheath-core polyester fiber, in order to obtain a firm feeling. If the weight loss rate due to the alkali weight loss treatment is too high, the amount of polyester fiber to be mixed is greatly reduced, and a crater-like groove is formed on the fiber surface, resulting in a decrease in tear strength and burst strength as a fabric, water absorption quick drying performance However, the durability to washing is not improved, and a firm texture is not obtained.

  Accordingly, in the alkali weight reduction treatment, it is preferable to treat with an aqueous alkali solution such as low concentration sodium hydroxide or potassium hydroxide in order to keep the weight loss rate of the mixed polyester fibers small. In addition, in order to effectively form a streak groove at or around the recess of the sheath-core type polyester fiber using a low-concentration alkaline aqueous solution, treatment with an alkaline aqueous solution containing alkylbenzyldimethylammonium chloride is performed. This is very important.

  Alkylbenzyldimethylammonium chloride acts as a phase transfer catalyst and binds to a hydrophilic alkali agent such as sodium hydroxide to accelerate the hydrolysis reaction of the polyester fiber. Alkylbenzyldimethylammonium chloride has a high affinity for polyester fibers, and the binding agent with an alkali agent is particularly attracted to the recesses of the recesses, so the reaction around the recesses is selectively promoted, so the recesses or the periphery of the recesses Long streak-like grooves A are easily formed, and short streak-like grooves B are easily formed around the recesses.

  By using together with alkylbenzyldimethylammonium chloride, it is easy to control the weight loss rate in the alkali weight loss treatment within the range of 5% to 15%, and the streak groove A and streak groove B can be easily formed. it can. Further, since it is possible to perform alkali weight reduction treatment at a low alkali concentration, the polyester fiber to be mixed is not excessively reduced, so that a woven or knitted fabric with a soft and firm feel can be obtained.

In the alkylbenzyldimethylammonium chloride, a compound having an alkyl group of C _{12 to} C ₁₈ can be used, and the number of added moles of EO (ethylene oxide) is 10 mol or less, preferably 5 mol or less. It is good because it does not cause a stain problem at the time of dyeing. When the EO addition mole number is 10 moles or more, the affinity with the polyester fiber is lowered, and the streak-like groove A and the streak-like groove B are not obtained within the weight loss rate range of the present invention. On the other hand, when EO is not added, oil stains and dye stains are likely to occur at the time of dyeing because the adsorption power to the fiber surface is high. To avoid this, the adsorbate on the fiber surface is removed after the alkali weight reduction treatment. Therefore, complicated soaping is required and industrial productivity is deteriorated.

Specific examples of the EO addition type alkylbenzylammonium chloride include Laccol CT-2000 (manufactured by Meisei Chemical Industry Co., Ltd., alkyl group C ₁₈ , EO addition mole number 2 mol).

  The concentration of the EO-added alkylbenzyldimethylammonium chloride is preferably in the range of 0.5 to 4.0 g / liter. If the concentration used is less than 0.5 g / liter, the intended elongated continuous streak groove may not be formed in the recess of the recess or its periphery, and there is variation in the formation of the streak groove between the single yarns. Large, it is difficult to obtain the streak-like groove A and the streak-like groove B defined in the present invention, so that there is a tendency that the washing durability of the water absorption quick-drying performance becomes insufficient. On the other hand, if the use concentration is higher than 4.0 g / liter, the hydrolysis reaction is excessively promoted, and it tends to be difficult to control the desired weight loss rate, and the foaming property at the time of processing increases, which affects productivity. There's a problem.

In the alkali weight reduction treatment, it is preferable that the concentration of the alkaline aqueous solution is 2 to 8 g / liter because the weight loss rate can be easily controlled. The treatment temperature is 100 ° C. or less, preferably 85 to 95 ° C., and the treatment time is preferably in the range of 5 to 60 minutes.
The range of the alkali weight loss rate of the present invention is 5 to 15%. When the weight loss rate is less than 5%, the formation of the streak groove is insufficient, the streak groove A and the streak groove B defined in the present invention cannot be obtained, and the washing durability of the water absorption and quick drying performance is insufficient. It becomes.

On the other hand, when the weight loss rate exceeds 15%, the width of the streak-like groove becomes large, the water holding power is increased, and the water absorption and quick drying performance tends to be lowered. Furthermore, if the weight loss rate exceeds 15%, fibrillation due to single yarn breakage and accompanying deterioration in the appearance quality of the knitted or knitted fabric and reduction in bursting strength may occur, resulting in not only a firm feeling but also a stain. There is also a problem that is easily attached.
By controlling the weight loss rate by the alkali weight loss treatment to 5 to 15%, preferably 6 to 10%, the polyester knitted fabric has good water-absorbing quick-drying performance and washing durability, and has a soft and firm texture. It becomes possible to grant.

In the present invention, the EO-added alkylbenzyldimethylammonium is treated by immersion treatment at a temperature of 70 to 80 ° C. with an aqueous solution of an anionic activator or nonionic activator alone or in combination after neutralization treatment after alkali weight reduction treatment. Since chloride can be completely removed, it is possible to avoid the influence on the dyeability and the problem of stains, and to prevent a decrease in light fastness.
In the dyeing process, when dyeing with disperse dyes, the dyeing conditions for dyeing polyester fibers with disperse dyes are usually applicable. Types of dyeing assistants and their concentrations, dyeing pH, dyeing bath ratio, dyeing time, etc. What is necessary is just to set suitably in consideration of the kind of goods to be dyed, the dyeing apparatus used, and the dyeing method.

  As the disperse dyes, azo disperse dyes represented by benzeneazo (monoazo, disazo, naphthaleneazo) and heterocyclic azo (thiazoleazo, benzothiazoleazo, quinolineazo, pyridoneazo, imidazoleazo, thiophenazo, etc.) It is preferable for improving color reproducibility and dyeing fastness. In particular, in a woven or knitted fabric mixed with easily dyeable polyester fiber or polytrimethylene terephthalate fiber, it is preferable to use a disperse dye having a diffusion index of 3.0 or more because color variation among dyeing batches is reduced.

The dyeing temperature is preferably 135 ° C. or lower, and the dyeing operation can be carried out by either a batch method or a continuous method using an apparatus such as a wins, a jigger, a beam dyeing machine, or a liquid dyeing machine. In addition to dip dyeing, it can also be dyed by a padding dyeing method or a printing method.
As post-treatment after dyeing, it is preferable to carry out reduction cleaning using a reducing agent. As the reducing agent, sodium hydrosulfite and thiourea dioxide are preferable, and as the alkali agent used in combination, an alkali metal hydroxide such as sodium hydroxide and an alkali metal carbonate such as sodium carbonate can be preferably used.

After reductive washing, finishing may be performed according to a conventional method, but the final set temperature is preferably 160 ° C. or lower, and in order to suppress dye sublimation from the sheath-core polyester fiber having an increased surface area due to the formation of streak grooves. When set at 130 ° C. or lower, more preferable results can be obtained.
As for the finishing agent used for the finishing treatment, any of those usually used for polyester fibers can be used. Among them, core-corona type fine particles composed of styrene-PEG 4000 (particle size distribution: 90 to 200 nm). Can be preferably used because it covers the entire surface of the sheath-core polyester fiber used in the present invention and further enhances the hygroscopicity and water absorption. Further, at the time of finishing, it is preferable to improve the water absorption and quick-drying performance by controlling the quantity so that it is driven in the course direction and widened in the well direction.

  The woven or knitted fabric dyed in this way has a soft and firm texture, exhibits excellent water-absorbing quick-drying properties and washing durability, and is excellent in wearing comfort and fastness performance. It is good. Specifically, a dyeing woven or knitted fabric having a high commercial value is obtained because the fastness to washing with a synthetic detergent according to the JIS-L-0844 method is grade 3 or higher.

EXAMPLES The present invention will be described more specifically with reference to examples below, but the present invention is not limited to these examples.
Measurement methods, evaluation methods, etc. are as follows.

(1) Flatness Flatness is represented by the ratio of the long side b and the short side a of the circumscribed rectangle of the cross section of the single yarn, and was calculated by the following equation.
Flatness = (long side b) / (short side a)

(2) Specific surface area of fiber Using a BET specific surface area meter (manufactured by Mounttech), the specific surface area of the single yarn was measured five times, and the average value was obtained.

(3) Shape and size of streak groove Using a scanning electron microscope (manufactured by Hitachi, model S-3500N), the surface of the sheath-core polyester fiber surface of the sample was magnified 1800 times, and five photographs were taken as appropriate. Take a picture and measure the width, length and number of the recesses and streak grooves around the recesses based on the scale gauge, the ratio of width to length (P), and the number of fibers per 30 μm (pieces) ) Was calculated and the average value of 5 locations was determined.

(4) Polyethylene glycol content After washing the knitted fabric, it was dried at room temperature for 24 hours, the sheath-core polyester fiber was taken out, and the content of polyethylene glycol in the fiber was measured by ¹ H-NMR method.
The measuring apparatus and conditions were as follows.
Measuring device: JNM-LA400 manufactured by JEOL Ltd.
_{Solvent: HFIP-d 2 / CDCL 3} (5/5)
Sample concentration: 5.0 wt / vol%
Measurement temperature: 25 ° C
Chemical shift standard: Tetramethylsilane (TMS) was set to 0 ppm Integration number: 256 Wait time: 2.9 seconds

In order to separate titanium oxide, the lysate was centrifuged and the supernatant was measured.
In addition, content rate was calculated | required using the methylene group signal of polyethyleneglycol, the measurement was performed 3 times for every sample, and the average value was calculated | required.

(5) Washing method The woven or knitted fabric was subjected to 30 cycles using an aqua dry washing machine (manufactured by Electroux-Wascater) with a cycle of the following conditions as one wash.
Washing conditions: Synthetic detergent (Kao Attack) 2g / liter, bath ratio 1:20, wash for 30 minutes at 80 ° C and dehydrated, then wash at 40 ° C for 5 minutes and dehydrate, then further to 40 ° C Washed with water for 10 minutes, dehydrated and dried at 70 ° C. for 30 minutes.

(6) Water drop disappearance time The water drop disappearance time was evaluated according to JIS L-1097 dropping method. Measurement was performed 5 times for each sample, and the average water droplet disappearance time was determined. At this time, the average amount of one water droplet was 0.039 ml.

(7) Water-absorbing quick-drying Wet knitted fabric (10 cm square) with water sufficiently, dehydrated with a dehydrator at 2000 rpm for 1 minute, weighed the woven / knitted fabric, calculated the moisture content, and then temperature 20 ° C Then, in an environment with a relative humidity of 65%, the time (minutes) until the moisture content of the knitted or knitted fabric became 2% (moisture content that felt dry) was measured.

(8) Water-absorbing diffusion area A woven or knitted fabric is attached to a 15 cm diameter embroidery round frame, and 0.1 ml of a water-soluble blue dye solution (containing 0.005 wt% of CI Acid Blue 62) is dropped on the surface of the woven or knitted fabric. The water absorption and diffusion area that spreads after 3 minutes was determined from the following equation.
Water absorption diffusion area (cm ² ) = [vertical diameter (cm) × horizontal diameter (cm)] × π ÷ 4
The measurement was performed 5 times for each sample, and the water absorption and diffusion area was determined from the average of the 5 times.

(9) Texture evaluation It evaluated by the inspector (30 persons). After washing the dyed product 10 times, the texture of the woven or knitted fabric was relatively evaluated according to the following criteria.
○ (Good): Soft and good feeling △ (Normal): Soft, but normal feeling × (Bad): Soft, but no feeling of stiffness

(10) Fastness to washing For dyed products, in accordance with JIS-L-0844 A2, the detergent is Kao Attack 1 g / liter, dyed fabric and white fabric (the same fabric as the dyed fabric is fluorescent whitened in the usual way) Then, the same finished fabric) was washed at a ratio of 1: 1 and a bath ratio of 1:30, and the washing liquid contamination and the contamination of the white fabric were judged by comparing with the contamination gray scale, respectively.

[Examples 1 to 3]
4 wt% polyethylene glycol with a number average molecular weight of 20000 is contained in polyethylene terephthalate A containing 2.0 wt% titanium oxide in the sheath and having an intrinsic viscosity [η] of 0.60 (measured in orthochlorophenol at 1 wt%). A polymer obtained by blending 50% by weight of copolymerized polyester B (polyethylene glycol content in the sheath portion is 2.0% by weight) was used. Polyethylene terephthalate A was used for the core.

  Both were extruded using two extruders so that the sheath / core weight ratio was 30/70, and the spinning temperature (spin head temperature) 290 was obtained from a nozzle having 36 spinning holes perforated in a W shape. The extrusion was performed at a temperature of 2000 ° C. and a spinning speed of 2000 m / min. Next, the filament is heated with a first drawing roll at 90 ° C., heat-set with a second drawing roll at 130 ° C., and drawn so that the elongation becomes 30 to 40%. A stretched yarn of 84 dtex / 36 filaments having a letter-shaped cross section was obtained (3 recesses, 130 ° opening angle inside recess, flatness 3.5, strength 3.7 cN / dtex, elongation 38%).

The obtained sheath-core polyester yarn having a W-shaped cross section was false twisted by a conventional method using a two-heater false twister to obtain false twisted yarn.
Using the obtained false twisted yarn and the false twisted yarn of 84 dtex / 72 filament polyester yarn (full dull), a smooth knitted fabric was prepared under normal knitting conditions on a 28 gauge, 33 inch knitting machine. . In this knitted fabric, the mixture ratio of the sheath-core type polyester fiber was 35.2 wt%, and the basis weight was 215 g / m ² .

  After scouring this knitted fabric at 80 ° C. and pre-setting at 170 ° C., the treatment time was adjusted so as to achieve the weight loss rate shown in Table 1-1 under the conditions shown below. The alkali weight loss treatment was performed.

(Conditions for alkali weight loss treatment)
Alkali: sodium hydroxide; 4 g / liter EO addition type alkylbenzylammonium chloride: Rakkor CT-2000 (manufactured by Meisei Chemical Industry); 1.5 g / liter
Bath ratio: 1:50
Processing temperature: 95 ° C

After the alkali weight loss treatment, washing with water was performed, and after washing for 10 minutes at 60 ° C. using 1.5 g / liter of an anionic activator (7WA-62; manufactured by Yushi Kogyo Co., Ltd.) and 1 ml / liter of acetic acid, the same anionic activator After washing at 80 ° C. for 15 minutes using 2 g / liter, washing with water was performed.
The measurement result of the polyethylene glycol content rate of each obtained knitted fabric is shown in Table 1-1.

Next, it dye | stained on the following dyeing | staining conditions.
(Dyeing conditions)
Dye: Dianics Blue S-2R (Dystar); 2.5% omf
Auxiliary agent: Nikka Sun Salt RM-340 (manufactured by Nikka Chemical Co., Ltd.); 0.5 g / liter Acetic acid: 0.5 cc / liter Sodium acetate: 1 g / liter Bath ratio; 1:25
Dyeing temperature and time: 130 ° C, 30 minutes

Confirm that there is no stain after dyeing, complete the dyeing, drain the dyeing residual liquid from the dyeing machine, add water to the dyeing machine, raise the temperature to 80 ° C., add the following agents to this, A reductive washing bath having the following concentration was prepared, and reductive washing was performed at 80 ° C. for 20 minutes.
Hydrosulfite: 2 g / liter Caustic soda: 2 g / liter Bisnole UP-10 (manufactured by Yushi Co., Ltd.): 0.5 g / liter Bath ratio; 1:25

After this reductive cleaning, the residual liquid is discharged, the dyed product is rinsed with warm water and water, and after dehydration, a sewing improver and an antistatic agent are applied, and after drying, a dry heat set at 110 ° C. for 40 seconds is performed. Done and finished.
Table 1-2 shows the evaluation results of water droplet disappearance time, water absorption diffusion area, water absorption quick drying, texture, and wash fastness of the finished dyed knitted fabric.
Table 1-1 shows the shapes of the streak-like grooves A and streak-like grooves B on the surface of the sheath-core polyester fiber when the obtained dyed knitted fabric is observed with an electron microscope at a magnification of 1800 times.

[Comparative Examples 1-3]
As Comparative Example 1, the knitted fabric of Example 1 was dyed and finished under the same conditions as in Example 1 without performing the alkali weight loss treatment.
As Comparative Example 2, instead of the sheath-core type polyester fiber, 84 decitex / 36 filament polyester fiber having W-shaped cross section (trade name; Technofine, concave opening angle 130 degrees, flatness 3) 0.0 semi-dial yarn), a smooth knitted fabric is prepared, alkali weight reduction treatment is performed so that the weight loss rate is 9.7%, and water-soluble polyester resin [SR-1000 (manufactured by Takamatsu Yushi)] is used at the time of dyeing. It dye | stained and finished on the conditions similar to Example 1 except having used together 5% omf.

  As Comparative Example 3, an 84 dtex / 36 filament sheath core yarn with a round cross-sectional shape was prepared by the same spinning method as in Example 1 using the same polymer as in Example 1. The sheath core weight ratio at this time was 30/70. The obtained raw yarn was false twisted in the same manner as in Example 1. Smooth knitting was performed using the obtained false twisted yarn and false twisted yarn made of 84 dtex / 72 filament polyester fiber (full yarn), and the weight was reduced by 5.8% in the same manner as in Example 1. Thereafter, it was dyed and finished under the same conditions.

Table 1-2 shows the evaluation results of water drop disappearance time, water absorption diffusion area, water absorption quick drying, texture, and wash fastness of each dyed product obtained.
Regarding Comparative Examples 1 to 3, the shape of the streak-like groove A and the streak-like groove B when observed at a magnification of 1800 times with an electron microscope as in Example 1 is shown in Table 1-1.
From the results of Table 1-2, the dyed knitted fabrics obtained in Examples 1, 2, and 3 of the present invention have a water absorption quick-drying property and their washing compared with the dyed knitted fabrics obtained in Comparative Examples 1, 2, and 3. It can be seen that this is a dyed knitted fabric that is excellent in durability, has a soft and firm texture, has no dirt during dyeing, and has a high commercial value.

[Examples 4 to 6]
4 wt% of polyethylene glycol having a number average molecular weight of 15000 is contained in the sheath portion of polyethylene terephthalate A containing 2.0 wt% of titanium oxide and having an intrinsic viscosity [η] of 0.60 (measured in orthochlorophenol at 1 wt%). A polymer obtained by blending 55% by weight of polyester B having a copolymer content of 55% (polyethylene glycol content in the sheath is 2.2% by weight) was used, and polyethylene terephthalate A was used for the core.

  Both are extruded using two extruders so that the sheath / core weight ratio becomes 40/60, and is spun at a spinning temperature (spin head temperature) 290 from a nozzle having 36 spinning holes perforated in a W shape. The extrusion was performed at a temperature of 2000 ° C. and a spinning speed of 2000 m / min. Next, the filament is heated with a first drawing roll at 90 ° C., heat-set with a second drawing roll at 130 ° C., and drawn so that the elongation becomes 30 to 40%. A drawn yarn of 84 dtex / 36 filaments having a letter-shaped cross section was obtained (3 recesses, 130 ° opening angle inside recess, flatness 3.6, strength 3.7 cN / dtex, elongation 37%).

From the obtained sheath-core polyester having a W-shaped cross section, false twisted yarn was obtained by a conventional method using a two-heater false twister.
The obtained false twisted yarn and false twisted yarn of 84 dtex / 24 filament polyester yarn (semi-dal), and false twisted yarn of 84 dtex / 36 filament polytrimethylene terephthalate fiber (Asahi Kasei Fibers Co., Ltd.) A smooth knitted fabric was prepared using a 28 gauge, 33 inch knitting machine. In this knitted fabric, the mixture ratio of the sheath-core type polyester fiber was 36.4 wt%, and the basis weight was 245 g / m ² .

After scouring this knitted fabric at 80 ° C. and pre-setting at 160 ° C., the treatment time was adjusted under the same conditions as in Example 1 so that the weight loss rate shown in Table 2-1 was obtained. The alkali weight loss treatment was performed with a flow dyeing machine.
The polyethylene glycol content of the obtained knitted fabric was as shown in Table 2-1.

Next, dyeing was performed under the same conditions as in Example 1, and it was confirmed that stains did not occur after dyeing, reduction washing was performed, the dyed product was rinsed, dehydrated, sewn improver, antistatic After applying the agent and drying, it was finished by performing a dry heat setting at 110 ° C. for 30 seconds.
Table 2-1 shows the shape of the streak-like groove A and streak-like groove B on the surface of the sheath-core polyester fiber when the obtained dyed knitted fabric is observed with an electron microscope at a magnification of 1800 times.
In addition, Table 2-2 shows the evaluation results of water drop disappearance time, water absorption quick drying, water absorption diffusion area, texture, and wash fastness of the obtained dyed knitted fabric.

[Comparative Example 4]
As Comparative Example 4, the knitted fabric of Example 2 was dyed and finished under the same conditions without performing the alkali weight loss treatment. Table 2-2 shows the evaluation results of water drop disappearance time, water absorption diffusion area, water absorption quick drying, texture, and wash fastness of the dyed product obtained.
From the results shown in Table 2-2, the dyed knitted fabric obtained in Examples 4, 5, and 6 of the present invention is superior in water-absorbing quick-drying property and its washing durability as compared with the dyed knitted fabric obtained in Comparative Example 4. It can be seen that this is a dyed knitted fabric that is excellent in wearing comfort, has a soft and firm feel, has no dirt during dyeing, and has a high commercial value.

[Examples 7 and 8]
4 wt% of polyethylene glycol having a number average molecular weight of 6000 is contained in the sheath portion of polyethylene terephthalate A containing 2.0 wt% of titanium oxide and having an intrinsic viscosity [η] of 0.60 (measured in orthochlorophenol at 1 wt%). %, A polymer obtained by blending 50% by weight of polyester B copolymerized (polyethylene glycol content in the sheath part is 2.0% by weight), and polyethylene terephthalate A was used for the core part.

  Both were extruded using two extruders so that the sheath / core weight ratio was 25/75, and the spinning temperature (spin head temperature) 290 was obtained from a nozzle having 36 spinning holes perforated in a W shape. Extrusion was performed at a temperature of 2000 ° C. and a spinning speed of 2000 m / min. Next, the filament is heated with a first drawing roll at 90 ° C., heat-set with a second drawing roll at 130 ° C., and drawn so that the elongation becomes 30 to 40%. A stretched yarn of 84 dtex / 36 filaments having a letter-shaped cross section was obtained (3 recesses, 130 ° opening angle inside recess, flatness 3.3, strength 3.3 cN / dtex, elongation 36%).

The obtained sheath-core polyester having a W-shaped cross section was false twisted by a conventional method using a two-heater false twister to obtain false twisted yarn.
Using the obtained false twisted yarn and a false twisted yarn of 84 dtex / 72 filament polyester (semi-dull), the mixing ratio of the sheath core type polyester fiber was 35.2 wt% on a 28 gauge, 33 inch knitting machine. The knitting conditions were adjusted so that a smooth knitted fabric was prepared. The basis weight of this knitted fabric was 210 g / m ² .

After scouring this knitted fabric at 80 ° C. and pre-setting at 180 ° C., the treatment time was adjusted to the weight loss rate shown in Table 3-1 in the same manner as in Example 1, and liquid dyeing was performed. Alkali weight loss treatment was performed with a machine.
The polyethylene glycol content of each knitted fabric obtained was as shown in Table 3-1.

Next, dyeing is performed under the same conditions as in Example 1, it is confirmed that there is no dirt, reduction washing is performed, and the dyed knitted fabric is rinsed, then dehydrated and dried, and then a sewing improver and an antistatic agent. After applying, dry heat setting was performed at 110 ° C. for 40 seconds to finish.
Table 3-1 shows the shapes of the streak-like grooves A and streak-like grooves B on the surface of the sheath-core polyester fiber when the obtained dyed knitted fabrics are observed with an electron microscope at a magnification of 1800 times.
In addition, Table 3-2 shows the evaluation results of water drop disappearance time, water absorption diffusion area, water absorption quick drying, texture, and wash fastness of each dyed knitted fabric obtained.

[Comparative Example 5]
As Comparative Example 5, the knitted fabric of Example 3 was dyed and finished under the same conditions without being subjected to alkali weight loss processing. Table 3-2 shows the evaluation results of water drop disappearance time, water absorption diffusion area, water absorption quick drying, texture, and wash fastness of the obtained dyed knitted fabric.
From the results of Table 3-2, the dyed knitted fabric obtained in Examples 7 and 8 of the present invention is superior in water-absorbing quick-drying and washing durability compared to the dyed knitted fabric obtained in Comparative Example 5. Further, it can be seen that this is a dyed knitted fabric having a soft and firm feeling, having no stain at the time of dyeing and having a high commercial value.

  The water-absorbing quick-drying woven or knitted fabric according to the present invention has excellent drying properties, has no stickiness or feeling of cooling even when the entire fabric is wet by sweat, and has excellent comfort when worn, such as sports clothing, underwear, etc. Can be suitably used.

a Short side b Long side S1 Streaky groove A (continuous muscle)
S2 Streak groove B (fine muscle)

Claims (1)

A woven or knitted fabric containing 20 wt% or more of a sheath-core type polyester fiber that satisfies the following requirements (1) to (3) is used at a temperature of 100 ° C. or less using an alkaline aqueous solution containing EO-added alkylbenzyldimethylammonium chloride. A process for producing a dyed water-absorbing quick-drying woven or knitted fabric, characterized by neutralizing and then dyeing after 5 to 15% reduction processing.
(1) A modified cross-section fiber having one or more recesses in a single yarn cross section.
(2) The sheath part contains 0.4 to 4.0 wt% of polyethylene glycol.
(3) The weight ratio of the sheath / core is 20/80 to 50/50.

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