JP2010255139A - Water-absorbing and diffusing polyester knit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-absorbing and diffusing polyester knit having excellent washing durability in water-absorbing and diffusing properties, soft texture with moist feeling, high color fastness, and excellent wearing feeling. <P>SOLUTION: The water-absorbing and diffusing polyester knit is composed as follows. A yarn constituting one surface of a knit fabric comprises a modified cross-section polyester fiber (a) having one or more dent parts in a single-fiber cross section, and a polyester fiber (b) having a single fiber fineness of 3 dtex or less. Further, the knit satisfies the followings: (1) the modified cross section fiber (a) having one or more dent parts on the single fiber cross section constitutes 60% or more of surface loops in one surface of the knit; (2) on the surface, the loops constituted of the modified cross section fiber (a) having one or more dent parts on the single fiber cross section are arranged so as to form three or more loops continued in a course direction and in a wale direction; and (3) the modified cross section fiber (a) having one or more dent parts on the single fiber cross section of not less than 20 wt.% is contained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water-absorbing and diffusing polyester knitted fabric that has excellent water-absorbing and diffusible washing durability and has a moist and soft texture.

  Conventionally, fabrics mainly composed of polyester fibers have excellent performance and are used for various purposes. 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. As the cloth for clothing, a cloth mainly made of polyester fiber is often used, but the polyester fiber generally has a problem of poor water absorption.

  Conventionally, as a method for imparting water absorbency to a polyester fiber, there are a method of imparting a polymer having a hydrophilic group to the fiber by a padding method, a dipping method, 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 moisture retention ability of the fiber is strong, so the diffusibility of moisture is poor and 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 utilizing the capillary phenomenon between the fibers by making the fiber cross section into a special shape, but in this method, the water absorption and diffusion performance changes due to fluctuations in the knitting structure and basis weight, There is a problem that stable water absorption and diffusion 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, with this method, although the water absorption performance is improved, moisture is retained in the gap and the diffusibility is poor, and when worn, the phenomenon that the moisture retained in the gap returns to the skin surface (so-called wet return phenomenon) occurs. However, it is not comfortable to wear, and it requires a high degree of weight reduction processing to create a gap, resulting in a strong texture and a soft texture with a moist feeling cannot be obtained. is there.

  Further, Patent Document 3 discloses a method for imparting a hydrophilic agent to thick fibers having a large number of fine grooves extending in a direction perpendicular to the fiber axis direction on the fiber surface. However, in this method, although the water absorption performance when not washed is improved, the washing durability is not sufficient, and since the fine grooves are arranged in a specific size and the number is small due to high weight reduction processing, However, since the performance of diffusing water is extremely poor and the weight loss rate is high, there is a problem that the texture becomes strong.

  Further, Patent Document 4 discloses a method for obtaining a knitted fabric having high water absorption and diffusibility by treating a polyester fiber 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 knitted fabric with high water absorption / diffusion performance can be obtained, it is difficult to obtain a moist and soft texture when used on the skin surface of a fabric because it is an irregular cross-section fiber. Therefore, in order to obtain a soft texture, it is necessary to combine with a multi yarn having a small single yarn fineness. However, by combining with a multi yarn having a small single yarn fineness, the absorbed water is retained in the fine yarn and the water absorption There is a problem that the diffusion performance deteriorates and there is a feeling of stickiness, and the smoothness of the skin is poor.

  Therefore, when the above problems are solved and polyester knitted dyed goods are washed not only at home, but also at high temperature in Europe and the United States, or at high temperature as represented by linen supply However, it exhibits sufficient water absorption, has excellent water absorption and diffusion performance, has a soft texture with a moist feeling on the skin surface, has good skin feel and wear comfort, and is dyeing fastness An excellent dyed product is highly desired.

Japanese Patent No. 2688794 Japanese Patent No. 3293704 Japanese Patent Laid-Open No. 08-013332 JP 2008-150728 A

  An object of this invention is to provide the knitted fabric which contains the polyester fiber and was excellent in the water absorption-diffusion performance. In particular, it has excellent durability of water absorption and diffusion performance due to high-temperature washing, has a moist and soft feel on the skin surface, excellent dyeing fastness, and excellent water absorption and diffusion comfort when sweating. The purpose is to provide knitting.

As a result of intensive studies to solve the above-mentioned problems, the present inventor constitutes one surface of a knitted fabric composed of a modified cross-section polyester fiber having one or more recesses and a polyester fiber having a single yarn fineness of 3 dtex or less. It has been found that an excellent water-absorbing and diffusing knitted fabric can be obtained by arranging atypical cross-section fibers having one or more recesses in a loop under specific conditions, and has led to the present invention.
That is, the present invention is as follows.

  1. The yarn constituting one surface of the knitted fabric is composed of a modified cross-section polyester fiber (a) having one or more recesses in the single yarn cross section, and a polyester fiber (b) having a single yarn fineness of 3 dtex or less. 1. A water-absorbing and diffusing polyester knitted fabric satisfying the conditions of 1) to (3).

(1) On one surface of the knitted fabric, the modified cross-section fiber (a) having one or more recesses in the single yarn cross section constitutes 60% or more of the surface loop.
(2) On the surface, the arrangement of loops formed by the atypical cross-section fiber (a) having one or more recesses in the single yarn cross section is three or more loops continuously in the course direction and the well direction.
(3) The modified cross-section fiber (a) having one or more recesses in the single yarn cross section is contained in an amount of 20 wt% or more.

  According to the present invention, it is a knitted fabric excellent in water absorption / diffusion performance including polyester fiber, excellent in water absorption / diffusion performance by high-temperature washing, has a moist and soft feel on the skin surface, and has a fast dyeing strength. It is possible to provide a water-absorbing and diffusing polyester knitted fabric excellent in wear comfort when sweated.

It is a figure which shows typically an example of the flat cross section of a W cross-section sheath core type polyester fiber as an example of the single yarn of the atypical cross-section fiber (a) which has one or more recessed parts. It is a figure which shows typically arrangement | positioning of the loop in the knitted fabric surface. It is a figure which shows typically that the needle extraction location becomes a space | gap in the leopard pattern structure | tissue by needle extraction.

The present invention will be described in detail below.
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.

  The water-absorbing and diffusing polyester knitted fabric of the present invention is a knitted fabric mainly composed of polyester fibers. A knitted fabric made of 100% polyester fiber may be used, and fibers other than the polyester fiber may be partially mixed as long as the effects of the present invention are not impaired.

  The water-absorbing and diffusing polyester knitted fabric of the present invention comprises a modified cross-section polyester fiber (a) having one or more recesses in a single yarn cross section, and a polyester fiber (b) having a single yarn fineness of 3 dtex or less, and any of the knitted fabrics One surface of the loop is a water diffusible knitted fabric in which a specific ratio is constituted by a modified cross-section polyester fiber having one or more concave portions, and a specific loop arrangement is formed.

  In the present invention, the cross-sectional shape of the single yarn of the modified cross-section polyester fiber (a) having one or more recesses in the single yarn cross section is not particularly limited, and is L-type, T-type, W-type, M-type, V-type, X-type. Polygon type such as Y type, cross type, and Yaba type, or indefinite type may be used. 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 with one or more recesses, the recesses and protrusions of the fiber cross section are entangled and the fibers are easily joined to each other. In addition, the active capillary effect brings about the effect of improving water absorption and water conductivity.

  As the cross-sectional shape of the single yarn of the modified cross-section polyester fiber (a) used in the present invention, the flatness is 1.1 to 5 and one or more recesses are provided, or the opening angle of the recesses in the corrugated flat cross section is 60. Those having one or more recesses of ˜160 degrees are preferred. Among them, 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 also preferable 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 thickness of the three sheaths of the recesses may be not only uniform as shown in FIG. 1 but also non-uniform. Further, 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 the bending stress is reduced when mixed with fibers having a single yarn fineness of 3 dtex or less in the present invention. In addition, due to the synergistic effect, it is easy to obtain a moist and soft texture.

  In general, in order to feel comfortable even when sweating when wearing clothes, it is necessary for the fabric to have the ability to absorb moisture. Since it is held, if the dryness of the fabric is poor, the sticky feeling is not eliminated, so the fabric feels uncomfortable and feels uncomfortable.

In order to eliminate this sticky feeling and smoothness of the skin, it is necessary to quickly diffuse the absorbed water and promote drying.
Thus, in order to improve the wearing comfort when sweating, two functions of a function of quickly absorbing and transporting moisture and a function of quickly diffusing the absorbed moisture are necessary at the same time.

  In order to exhibit these two functions at the same time, in the present invention, a specific long streak groove A and a short streak groove parallel to the fiber axis direction are formed on the surface of a modified cross-section fiber having one or more recesses in a single yarn cross section. It is particularly preferable to mix the two types of 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 exert this effect to the maximum, the stripe-shaped groove A is formed in the recess of the concave portion on the surface of the single yarn 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 is quickly diffused and spread throughout the knitted fabric as if it were an action of a capillary tube. As a result, the effect of promoting evaporation is exhibited. Is. 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 and diffusing performance excellent in washing durability performance, either the streak groove A or the streak groove B is used as the streak groove to be present on the surface of the atypical cross-section fiber having one or more recesses. If it is alone, it will lack the ability to transport the absorbed moisture or lack the ability to absorb and diffuse water.

  Therefore, it is important that the streak-like groove A and the streak-like groove B are mixed around the recess of the recess, and the specific streak-like groove contains incompatible polyethylene glycol in the polyester, and has a specific condition. By carrying out the alkali weight reduction treatment, a large number can be formed on the fiber surface along the fiber axis direction. In order to suppress a decrease in strength of the raw yarn due to the alkali weight loss treatment, it is particularly preferable that the atypical cross-section fiber having one or more recesses in the single yarn cross section has a sheath core structure and the sheath portion contains 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 content of polyethylene glycol contained in the sheath is preferably 0.4 to 4.0 wt%. When the content is in the above range, the recesses or the streak grooves are sufficiently formed in the periphery by the alkali weight reduction treatment, so that excellent water absorption / diffusion performance and washing durability can be obtained. A sheath-core type polyester fiber having an irregular cross-sectional shape having one or more recesses can be spun at a good yield.

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 of incorporating polyethylene glycol into the polyester is not particularly limited, and any conventionally known method such as mixing in the polymerization stage, chip blending, melt kneading, etc. can be employed.

  In the present invention, the sheath / core polyester fiber, which is a preferred form of the modified cross-section fiber having one or more recesses in the single yarn cross section, preferably has a sheath / core weight ratio of 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. Moreover, when the weight ratio of the sheath portion / core portion is within the above range, a decrease in strength of the raw yarn 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. It tends to be difficult to obtain long continuous streak grooves. On the contrary, when the weight ratio of the sheath part / core part exceeds 50/50, the decrease in the yarn strength due to the alkali weight loss treatment increases, and the burst strength of the knitted fabric tends to decrease. The weight ratio of the sheath part / core part is preferably 25/75 to 40/60 from the viewpoints of the productivity of raw yarn, the formation of streak-like grooves on the fiber surface by alkali weight reduction treatment, and the knitted material properties.

  In the present invention, a sheath-core type polyester fiber, which is a preferred form of a modified cross-section fiber having one or more recesses in a single yarn cross section, has a long streak groove A and a short streak groove along the fiber axis direction on the surface of the fiber. More preferably, B is mixed.

  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-shaped grooves A are formed in the recess or the periphery of the recess, and the ratio P (P = L / D) of the length (L) to the width (D) of the streak-shaped grooves is It is preferable that it is 75 or more, 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, when two types of streak groove A and streak groove B are mixed, sweat is quickly absorbed and diffused when wearing clothes and sweat, so that it is not sticky and has a smooth feeling. Since the evaporation of sweat is promoted and drying quickly, the comfort of wear is improved, and the presence of the streak groove A and streak groove B in the recess or around the recess makes the touch even better, and the effect is It is retained even after repeated washing.

  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 P or more, when P is 50 or more, although the diffusibility increases, the specific surface area increases and the dehydration drying property tends to decrease.

  For this reason, in the present invention, it is more preferable to mix and form the streak-like groove A and the streak-like groove B because the water absorption diffusivity is further improved. In order to mix such a streak-like groove A and streak-like groove B, a fiber using a sheath core type polyester fiber having a different cross section having one or more recesses in a single yarn cross section and containing polyethylene glycol in the sheath part is used. It is preferable to reduce the amount by 5 to 15% by alkali weight reduction treatment.

  In the present invention, the polyester fiber (b) having a single yarn fineness of 3 dtex or less is a polyester fiber that does not include a recess in the single yarn cross section. Preferably, the single yarn fineness is 2.5 dtex or less, and the total fineness is 30 to 250 dtex, since both the water absorption diffusion performance and the soft texture are combined. If the single yarn fineness exceeds 3 dtex, a soft texture cannot be obtained.

  The form of the fiber may be long fiber or short fiber, and may be uniform or thick in the length direction. The cross-sectional shape of the fiber is preferably a round cross-section yarn, but if an eyebrows type flat yarn is used, a soft texture with a moist feeling can be obtained and more preferably used.

  In the present invention, the fineness of the modified cross-section polyester fiber having one or more recesses in the single yarn cross section is not particularly limited, but the total fineness is preferably 30 to 250 dtex, and the single yarn fineness is 2 dtex or more, preferably 2 .3 dtex or more is preferable from the viewpoint of water diffusibility.

  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 knitted fabric of the present invention contains 20 wt% or more of atypical cross-section polyester fiber (a) having one or more recesses in a single yarn cross section. When the modified cross-section polyester fiber is less than 20 wt%, the washing durability of the water absorption and diffusion performance is deteriorated.

  A knitted fabric made of 100% atypical cross-section polyester fiber (a) with one or more recesses in a single yarn cross section has excellent water absorption and diffusion performance, but it has sebum stains when worn, stains such as blemishes, and stains during washing. There is a problem that it is easy, and the water retaining power of the entire knitted fabric becomes high. From the viewpoint of washing durability, drying speed in practical washing, cost, texture, etc., the content of the atypical cross-sectional polyester fiber is preferably 60 wt% or less.

  The knitted fabric of the present invention is characterized in that, on one surface of the knitted fabric, the atypical cross-sectional polyester fiber (a) having one or more recesses constitutes 60% or more of the surface loop. When the proportion of the irregular cross-section polyester fiber (a) in the surface loop is less than 60%, the water absorption and diffusion performance is deteriorated. The upper limit of the ratio in the surface loop is preferably less than 90% from the viewpoints of the knitted fabric physical properties, the texture of the knitted fabric surface, the texture, and the water absorption and diffusion performance.

  In the present invention, the above-mentioned atypical cross-section polyester fiber (a) having one or more recesses in the single yarn cross-section constitutes 60% or more of the surface loop, and the atypical cross-section polyester fiber ( In order to improve the water absorption and diffusion performance, it is important that the arrangement of the loops constituted by a) is arranged continuously in three or more loops in the course direction and the well direction.

  In the present invention, a preferred example of the arrangement of loops constituting one surface of the knitted fabric is shown in FIG. In FIG. 2, when the loop formed by the fiber (a) is V and the loop formed by another fiber is U, the example shown in FIG. 2- (1) to FIG. 2- (5) The loop V formed by the fiber (a) is continuously arranged in three or more loops in the course direction (vertical direction in the figure) and the well direction (horizontal direction in the figure). In the example of FIG. 2- (8), the loop V indicates that only 1-2 loops are continuously arranged in the course direction.

  Of the arrangement of loops constituting the surface, in the course direction, the well direction, or in both the course direction and the well direction, when the continuous loop formed by the fiber (a) is less than 3, the fiber Even if the mixing ratio in the knitted fabric of (a) is 20 wt% or more and the loop ratio of the knitted fabric surface is 60% or more, the diffusibility is inhibited by other fibers, and the water absorption and diffusion performance deteriorates.

  In addition, even when loops are continuously arranged in the course direction and the well direction, in the case of a tissue having a cocoon pattern by “needle removal” that is generally performed to make the knitted fabric surface mesh-like, Since the atypical cross-section fiber having one or more recesses in the single yarn cross section is cut, the water absorption and diffusion performance is deteriorated, which is not preferable. An undesirable example of a loop arrangement with ridges is shown in FIG.

  In the present invention, the polyester fiber includes trimethyl phosphate, triethyl phosphate, tributyl phosphate, triphenyl phosphate, trimethyl phosphite, triethyl phosphite, triphenyl phosphite, phosphoric acid, phosphorous acid to improve hue and heat resistance. An acid or the like may be added to the polyester fiber in an amount of preferably 0.001 to 2 wt%, more preferably 0.02 to 1 wt%. 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 knitted fabric of the present invention, examples of the form of the knitted fabric include general knitting, for example, a method of aligning and feeding each fiber, a double knitted fabric (for example, a double circular knitting machine, a double horizontal knitting machine) In a knitting machine or a double raschel warp knitting machine), there is a method in which each fiber is fed or fed to the front surface and / or back surface.

  In the present invention, in the case of forming two types of streak grooves, a specific long streak groove A and a short streak groove B, parallel to the fiber axis direction on the surface of the atypical cross section fiber having one or more recesses in the single yarn cross section It can be controlled by the conditions for 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.

  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 on the fiber surface is within the range defined by the present invention, excellent water-absorbing diffusibility and washing durability can be obtained. In particular, the water-absorbing and diffusive washing durability is implemented not only in the durability of home washing washed with warm water from room temperature, but also in high-temperature washing at 60 ° C. or higher and linen supply as is done in Western homes. Excellent durability in high temperature washing.

In the water-absorbent 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 and diffusing knitted fabric of the present invention, the water-absorbing and diffusing area after washing 30 times at 80 ° C. is 8 cm ² or more, more preferably 12 cm ² or more.

  By mixing the streak-like grooves A and the streak-like grooves B on the fiber surface around the recesses or around the recesses, the water-absorbing diffusibility and its washing durability 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.

  Moreover, 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 with a moist feeling 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.

  In order to form the streak-like groove A and streak-like groove B on the surface of the modified cross-section polyester fiber having one or more recesses in the single yarn cross section, an alkaline aqueous solution is used for the knitted fabric containing the atypical cross-section polyester fiber prior to dyeing. The alkali weight loss treatment is performed at a weight loss rate of 5 to 15%. 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.

  When the weight loss rate by the alkali weight loss treatment is less than 5%, the length of the continuous long streak groove A formed in the recess or the periphery of the recess becomes less than 30 μm, and P becomes less than 75, and the transport of the absorbed moisture Since the force is weak and a predetermined number of short streak grooves B are not formed, the water diffusibility is poor and the water absorption and diffusion performance is lowered.

  On the other hand, when the weight loss rate by the alkali weight loss treatment exceeds 15%, both the long streak groove A and the short streak groove B have a large groove width, an increased specific surface area, and a high water retention capacity. , The diffusibility of the absorbed water becomes worse. 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.

  In the present invention, in order to obtain a soft texture with a moist feeling on the skin surface, it is important to form streak-like grooves at a reduced rate only on the fiber surface of the atypical cross-section fiber having one or more recesses. . If the weight loss rate due to the alkali weight loss treatment is too high, the polyester fiber with a single yarn fineness of 3 dtex or less is greatly reduced, and a crater-like groove is formed on the fiber surface. The water absorption quick drying performance is insufficient, the washing durability is not improved, and a moist and soft feel is not obtained.

  Therefore, in the alkali weight loss treatment, it is preferable to treat with a low concentration aqueous solution of sodium hydroxide, potassium hydroxide or the like in order to keep the weight loss rate of the polyester fiber having a single yarn fineness of 3 dtex or less to be 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. It is preferable.

  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 an alkali weight reduction treatment at a low alkali concentration, the polyester fiber to be mixed is not excessively reduced, so that a moist and soft knitted fabric can be obtained.

  In the alkylbenzyldimethylammonium chloride, a compound having a C12 to C18 size can be used, and the number of added EO (ethylene oxide) is 10 mol or less, preferably 5 mol or less. This is preferable because it does not cause the problem of contamination. When the EO addition mole number is 10 moles or more, the affinity with the polyester fiber is reduced, and preferable streak-like grooves A and streak-like grooves B cannot be obtained within the above-mentioned weight loss range. On the other hand, when EO is not added, oil stains and dye stains are likely to occur during dyeing because of the high adsorption power to the fiber surface. In order to avoid this, after the alkali weight reduction treatment, complicated soaping for removing the adsorbate on the fiber surface 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 C18, 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. Since large and sufficient streak-like grooves A and streak-like grooves B are difficult to obtain, the washing durability of the water absorption and diffusion performance tends to be insufficient. On the other hand, when the concentration used is higher than 4.0 g / liter, the hydrolysis reaction is excessively promoted, and it tends to be difficult to control to a desired weight loss rate. There is a problem that affects productivity.

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-like grooves becomes insufficient, the preferable streak-like grooves A and B are not obtained, and the washing durability of the water absorption / diffusion performance becomes insufficient.

  On the other hand, if the weight loss rate exceeds 15%, the width of the streak-like groove becomes large, the water holding power becomes high, and the water absorption and diffusion performance tends to be lowered. In addition, if the weight loss rate exceeds 15%, not only does the fibrillation due to single yarn breakage, the appearance quality of the knitted fabric and the rupture strength decrease, and a soft texture with a moist feeling cannot be obtained. There is also a problem that it is easy to get dirty.

  By controlling the weight loss rate by the alkali weight loss treatment to 5 to 15%, preferably 6 to 10%, the water absorption and diffusion performance of the polyester knitted fabric and its washing durability are improved, and a soft texture with a moist feeling is given. Is possible.

  In the present invention, when alkali reduction treatment is performed, neutralization treatment is performed after the treatment, and then an EO-added alkylbenzyl is treated by immersion treatment at a temperature of 70 to 80 ° C. with an anion activator or nonionic activator alone or in combination. Since dimethylammonium 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. It may be set as appropriate in consideration of the type of article 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 the reduction cleaning, finishing treatment may be performed according to a conventional method, but the final set temperature is preferably less than 150 ° C., and dye sublimation from one or more irregular cross-section polyester fibers having a surface area increased by forming a streak groove In order to suppress this, a more preferable result can be obtained by setting at 130 ° C. or lower.

  As for the finishing agent used for the finishing treatment, any of those usually used for polyester fibers can be used. Further, at the time of finishing, it is preferable to increase the water absorption / diffusion performance by controlling the property so that it is driven in the course direction and widened in the well direction.

  The dyed knitted fabric has a moist and soft texture, exhibits excellent water diffusibility and washing durability, is also excellent in wearing comfort, and has good fastness performance. It is. Specifically, a dyeing knitted fabric having a high commercial value is obtained, which has a fastness to washing with a synthetic detergent according to JIS-L-0844, which is 3 or higher.

EXAMPLES Hereinafter, although an Example etc. are given and this invention is demonstrated further, this invention is not limited at all by these Examples.
The characteristic value measurement method, evaluation method, 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) 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.

(3) 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 vol%
Measurement temperature: 25 ° C
Chemical shift standard: Tetramethylsilane (TMS) was set to 0 ppm Integration count: 256 Waiting 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.

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

(5) 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.

(6) Water-absorbing diffusion area The knitted fabric is attached to a round frame for embroidery with a diameter of 15 cm, 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.

(7) Texture evaluation It evaluated by the inspector (30 persons). After washing the dyed product 10 times, the feeling of the knitted fabric was relatively evaluated according to the following criteria.
○ (Good): Moist feeling and very soft texture △ (Normal): Moist feeling and soft texture slightly missing × (Poor): No moist feeling and soft texture

(8) Fastness to washing For dyed products, in accordance with JIS-L-0844-A2, using 1g / liter of Kao Attack as a detergent, dyed fabric and white fabric (the same fabric as the dyed fabric is fluorescent using a conventional method) Whitened fabric with the same finishing finish) was washed at a ratio of 1: 1 and a bath ratio of 1:30, and washing liquid contamination and contamination of the white fabric were judged by comparing with the contamination gray scale, respectively. .

[Examples 1 to 5]
4 wt% of polyethylene glycol with a number average molecular weight of 20,000 is contained in polyethylene terephthalate A containing 2.0 wt% of titanium oxide in the sheath and having an inherent year [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 a false twisted yarn of 84 dtex / 72 filament polyester yarn (full dull) on a 28 gauge, 33 inch knitting machine, the above W-shaped atypical cross-section fibers are shown in Table 1. A smooth knitted fabric was prepared by adjusting the knitting conditions so that the mixture ratio (in the knitted fabric) and the ratio in the surface loop of the knitted fabric were adjusted. The basis weight was adjusted to be around 220 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 alkali weight loss rate shown in Table 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: Rakkol CT-2000 (manufactured by Meisei Chemical Co., Ltd.); 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 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.
Table 1 shows the measurement results of the polyethylene glycol content of each obtained knitted fabric.

Next, it dye | stained on the following dyeing | staining conditions.
(Dyeing conditions)
Dye: Dianics Blue S-2R (Dystar); 3.5% 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.
Thiourea dioxide: 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 2 shows the evaluation results of the water drop disappearance time, water absorption diffusion area, texture, and wash fastness of the finished dyed knitted fabric.
Table 1 shows the shape of the streak groove A and the streak groove B on the surface of the sheath-core polyester fiber having a W-shaped cross section when the obtained dyed knitted fabric is observed with an electron microscope at a magnification of 1800 times. .

[Comparative Examples 1-3]
As a comparative example, a smooth knitted fabric was prepared by using the same yarn as in Example 1 and adjusting the knitting conditions so that the mixing ratio shown in Table 1 (in the knitted fabric) and the ratio in the surface loop of the knitted fabric were obtained. The basis weight was adjusted to be around 220 g / m ² .

After scouring the obtained knitted fabric at 80 ° C. and pre-setting at 190 ° C., the treatment time was adjusted under the same conditions as in Example 1 so that the alkali weight loss rate shown in Table 1 was obtained. The alkali weight loss treatment was performed with a flow dyeing machine. After weight reduction processing, it was dyed and finished under the same conditions as in Example 1.
Table 2 shows the evaluation results of the water drop disappearance time, water absorption diffusion area, water absorption drying property, texture, and wash fastness of each dyed product obtained.

For Comparative Examples 1 to 3, as in Example 1, the shapes of the streak-like groove A and streak-like groove B when observed with an electron microscope at a magnification of 1800 times are shown in Table 1.
From Tables 1 and 2, the dyed knitted fabrics obtained in Examples 1, 2, 3, 4 and 5 of the present invention were more water-absorbing and diffusive than the dyed knitted fabrics obtained in Comparative Examples 1, 2, and 3. It can be seen that this is a dyed knitted fabric having excellent washing durability, a moist soft feel, excellent dyeing fastness and high commercial value.

[Examples 6 to 8]
As an example, instead of the sheath-core type polyester fiber of Example 1, 84 decitex / 36 filament polyester fiber having a W-shaped cross section (Asahi Kasei Fibers Co., Ltd., trade name; Technofine, 3 recesses, opening of recesses) Using a 28-gauge, 33-inch knitting machine, using a false twisted yarn with a 130 degree angle and a flatness of 3.0, and a false twisted yarn with 84 dtex / 72 filament polyester (full dull) A smooth knitted fabric was prepared by adjusting the knitting conditions so that the W-shaped atypical cross-section fibers had the mixing ratio shown in Table 3 (in the knitted fabric) and the ratio in the surface loop of the knitted fabric. The basis weight was adjusted to be around 220 g / m ² .

  This knitted fabric was scoured at 80 ° C., pre-set at 180 ° C., and then dyed under the same conditions as in Example 1. At the time of dyeing, a water-soluble polyester resin [SR-1000 (manufactured by Takamatsu Yushi)] was used in combination with 5% omf.

After dyeing, reduction washing is performed under the same conditions as in Example 1. After reduction washing, the residual liquid is discharged, the dyed product is rinsed with warm water and water, and after dehydration, a sewing improver and antistatic An agent and a polyester resin [Ultrafil HSD (manufactured by Huntsman) 2%] were applied, and after drying, a heat-drying set at 150 ° C. for 40 seconds was performed.
Table 3 shows the evaluation results of the water drop disappearance time, water absorption diffusion area, texture, and wash fastness of the finished dyed knitted fabric.

[Comparative Examples 4 to 6]
As Comparative Examples 4 to 6, the same yarn as in Example 2 was used, and the smooth knitted fabric was adjusted by adjusting the knitting conditions so that the mixing ratio (in the knitted fabric) and the ratio in the surface loop of the knitted fabric shown in Table 3 were obtained. Prepared. The basis weight was adjusted to be around 220 g / m ² .

The obtained knitted fabric was scoured at 80 ° C., pre-set at 180 ° C., and then dyed and reduced and washed under the same conditions as in Example 6 to give a finish and finish.
Table 3 shows the evaluation results of the water droplet disappearance time, water absorption diffusion area, water absorption drying property, texture, and wash fastness of each dyed product obtained.

From the results in Table 3, the dyed knitted fabrics obtained in Examples 6, 7, and 8 of the present invention were more water diffusible and their washing durability than the dyed knitted fabrics obtained in Comparative Examples 4, 5, and 6. It can be seen that this is a dyed knitted fabric having a high softness with a moist feeling and excellent dyeing fastness.

  The water-absorbing and diffusing knitted fabric of the present invention has excellent diffusion performance, has no stickiness or cold feeling even when the entire fabric is wet due to sweat, and is excellent in comfort when worn.For sports clothing, underwear, etc. It can be used suitably.

a Short side b Long side S1 Streaky groove A (continuous muscle)
S2 Streak groove B (fine muscle)
V Loop of irregular cross-section fiber having one or more recesses in the cross section of single yarn U Loop of fiber with single yarn fineness of 3 dtex or less

Claims (1)

The yarn constituting one surface of the knitted fabric is composed of a modified cross-section polyester fiber (a) having one or more recesses in the single yarn cross section, and a polyester fiber (b) having a single yarn fineness of 3 dtex or less. 1. A water-absorbing and diffusing polyester knitted fabric satisfying the conditions of 1) to (3).
(1) On one surface of the knitted fabric, the modified cross-section fiber (a) having one or more recesses in the single yarn cross section constitutes 60% or more of the surface loop.
(2) On the surface, the arrangement of the loops formed by the modified cross-section fiber (a) having one or more recesses in the single yarn cross section is three or more loops continuously in the course direction and the well direction.
(3) The modified cross-section fiber (a) having one or more recesses in the single yarn cross section is contained in an amount of 20 wt% or more.

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