JP2009144317A - Polyester multifilament fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester conjugate multifilament fiber imparting stretch property and good fullness feeling of woven or knitted fabric, having good process-through property in production of a woven or knitted fabric and imparting sufficient fullness feeling and stretch property, and to provide woven or knitted fabric thereof. <P>SOLUTION: The polyester multifilament is composed of a single fiber in which two kinds of polyester polymers having different melting viscosities are bonded and simultaneously satisfies the following requirements (1), (2), and (3). (1) the percentage of crimp (CC) is ≥20 and ≤50 (%), (2) the percentage of crimp at high temperature (HC) is ≥25 and ≤60 (%), and (3) HC>CC, wherein the percentage of crimp (CC) is the percentage of crimp measured under wet heat treatment conditions for 20 min at 90°C, and the percentage of crimp at high temperture (HC) is the percentage of crimp measured under wet heat treatment conditions for 20 min at 130°C. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a polyester multifilament fiber that gives stretchability and good swelling feeling of a woven or knitted fabric, has good process-passability during the production of a woven or knitted fabric, and provides a deep color.

  Conventionally, Patent Document 1 discloses that two types of thermoplastic polymers having different melt viscosities are made into a joint type composite fiber yarn by a composite spinning that is discharged from the same discharge hole, and a spiral type crimp is expressed by heat treatment to form a crimped stretch yarn. In order to obtain a high crimp, it is possible to increase the difference in melt viscosity between the two thermoplastic polymers used, and to use a polyester having a high shrinkage as a high melt viscosity component. Latent crimped composite fibers have been proposed, and it is known that a woven or knitted fabric made of the fibers has a stretchable and deep color.

  However, the conventional latently crimped conjugate fiber produces large crimps due to heat treatment of the twisted set after twisting, and crimps, snares, etc. are generated. Problems such as thread catching and thread breakage due to abrasion are likely to occur.

Japanese Patent Laid-Open No. 9-157941

  The present invention provides a polyester multifilament fiber that solves the disadvantages of the prior art, and that is excellent in processability in knitting and weaving, and that imparts stretchability and deep color when made into a woven or knitted fabric. It is.

The first gist of the present invention is characterized in that it consists of a single fiber in which two types of polyester polymers having different melt viscosities are joined, and satisfies the following requirements (1) to (3) simultaneously as a multifilament fiber. Polyester multifilament fiber.
(1) 20 ≦ crimp rate (CC) ≦ 50 (%)
(2) 25 ≦ high temperature crimp rate (HC) ≦ 60 (%)
(3) HC> CC
However, the crimp ratio (CC) is a crimp ratio measured at 90 ° C. for 20 minutes under wet heat treatment conditions, and the high temperature crimp ratio (HC) is a crack measured at 130 ° C. for 20 minutes under wet heat treatment conditions. Reduction rate.

  The second gist of the present invention is a copolymerized polyethylene terephthalate obtained by copolymerizing a high-viscosity component of 5 to 15 mol% of the third component among the two types of polyester polymers having different melt viscosities in the main constitution. The polyester maltofilament fiber according to Item 1 is a woven or knitted fabric characterized by including the polyester multifilament fiber of the present invention and having a fabric shrinkage (LC) of 20 to 40%.

  The present invention provides a polyester composite multifilament fiber and a woven or knitted fabric that have good process passability during the production of a woven or knitted fabric, provide a deep color, and impart sufficient swelling and stretchability.

  Hereinafter, preferred embodiments of the present invention will be specifically described.

  The polyester composite multifilament fiber of the present invention needs to be a multifilament fiber composed of single fibers obtained by joining two kinds of polyester polymers having different melt viscosities in order to develop stretchability when used as a fabric.

  The polyester polymer constituting the single fiber may be a combination of a low viscosity and a high viscosity with the same polymer as long as it has a combination of different melt viscosities in order to obtain good stretchability when formed into fibers. Polyester (A), which is one component having a different viscosity, has a high viscosity and acts as a high shrinkage component, and polyester (B), which is the other component, acts as a low viscosity and low shrinkage component.

  From the viewpoint of crimping, a copolymerized polyethylene terephthalate in which a high viscosity component is copolymerized in an amount of 5 to 15 mol% among two polyester polymers having different melt viscosities is preferable.

  If the third component is less than 5 mol%, it is difficult to obtain sufficient crimping power, and if it exceeds 15 mol%, the melting point is remarkably lowered and not only composite spinning itself becomes difficult, but also crimping power tends to be insufficient.

  Examples of the third component include aromatic dicarboxylic acids other than terephthalic acid components, acid components such as aliphatic dicarboxylic acids, aliphatic diols other than ethylene glycol components, alicyclic diols, diol components such as aromatic diols, Specifically, isophthalic acid, adipic acid, sebacic acid, 1,4-butanediol, cyclohexanediol, bisphenol A ethylene oxide adduct, sulfoisophthalic acid metal salt, 2,2-bis [4- (2-hydroxyethoxy) Phenyl] propane and the like, and isophthalic acid, adipic acid, sulfoisophthalic acid metal salt, and 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane are particularly preferable. These third components may be used alone or in combination of two or more.

  Furthermore, the joining of the two polyester polymers having different melt viscosities according to the present invention may be any joining as long as the joint fiber exhibits good stretchability. The side-by-side type or the eccentric core-sheath type is preferably used, and the side-by-side type is more preferably used for obtaining a high stretch property.

  Moreover, in this invention, it is required as a multifilament fiber that a crimp rate (CC) is 20 to 50%, and a high temperature crimp rate (HC) is 25 to 60%.

  The crimp ratio (CC) affects the crimp generated during the twisting set after twisting. The lower limit of CC is 20% or more, preferably 30% or more, and the upper limit is 50% or less, preferably 45% or less. good. If it is less than 20%, the processability of knitting and weaving is good, but the stretchability when made into a fabric is inferior. If it exceeds 50%, the crimps appearing in the twisted set after twisting will cause yarn breakage in the knitting and weaving process, and the form of the knitted or knitted fabric will not be stable.

  Further, the high temperature crimp ratio (HC) indicates the crimp ratio developed by heat treatment in the dyeing process, and the lower limit of HC is 25% or more, preferably 30% or more, and the upper limit is 60% or less, preferably 50% or less. good. If the HC is less than 25%, the stretchability when the woven or knitted fabric is made is inferior, and if it exceeds 60%, when the crimp is developed in the dyeing process, the unevenness becomes remarkable and the form of the woven or knitted fabric is not stable.

In the present invention, it is necessary that HC> CC. When HC is larger than CC, crimping occurs even in the heat treatment in the dyeing process after weaving and weaving after heat treatment with a twisting set after twisting, and the stretch properties are excellent when it becomes a woven or knitted fabric.
Furthermore, the lower limit of the degree of elongation (DE) of the multifilament fiber of the present invention is preferably 20% or more, more preferably 30% or more, and the upper limit is 70% or less, more preferably 60% or less. When the elongation exceeds 70%, sufficient crimping is less likely to occur when a woven or knitted fabric is obtained, and it is difficult to obtain satisfactory stretch performance. If it is less than 20%, the elongation is insufficient in the process of weaving and weaving, so yarn breakage is likely to occur, and process passability is likely to be poor.

  Next, the production method for obtaining the polyester multifilament fiber of the present invention will be specifically described.

The polyester multifilament fiber of the present invention is an unstretched yarn of a joint type composite fiber obtained by spinning polyester (A) and polyester (B) satisfying the following formula (a) at a take-up speed of 2500 m / min or less. It can be obtained by drawing with a heated roller under conditions that satisfy the following formulas (b) to (f).
[Η] A− [η] B> 0.145 (a)
1.000 ≦ DR1 (b)
MDR × 0.65 ≦ DR2 ≦ MDR × 0.73 (c)
DR1 <DR2 (d)
Tg ≦ TDR1 ≦ Tc-30 (e)
Tg + 20 ≦ TDR2 ≦ Tc (f)
(In the formula, [η] A and [η] B are the intrinsic viscosities of polyesters (A) and (B), respectively, and MDR is the maximum draw ratio of the undrawn yarn at a draw temperature of 85 ° C. DR1 is 1. Stage draw ratio, DR2 is the second stage draw ratio, TDR1 is the roller temperature in the first stage drawing, TDR2 is the roller temperature in the second stage drawing), Tg (° C.) is the glass transition temperature of the undrawn yarn, Tc (° C. ) Indicates the crystallization temperature of the undrawn yarn. In addition, when the crystallization temperature and the glass transition temperature of the undrawn yarn of the composite fiber are each measured at two points, the lower temperature is the crystallization temperature and the higher temperature is the glass transition temperature)

  The difference in intrinsic viscosity between polyester (A) and polyester (B) is preferably greater than 0.145. When the difference in intrinsic viscosity is 0.145 or less, the difference in shrinkage between the polyester (A) and the polyester (B) is small, the expression of crimp is insufficient, and the stretch performance cannot be obtained.

  In addition, the joining ratio (weight ratio) W of polyester (A) / polyester (B) during composite spinning is preferably 4/6 <W <6/4 in order to give a crimp expression in the form of the composite fiber. . If the joining ratio is out of the above range, the spinning property is likely to be lowered, and the crimping ability in the form of the composite fiber is likely to be insufficient.

  Furthermore, the unstretched yarn needs to be stretched in two stages with a heating roller under the conditions satisfying the formulas (b) to (f). In drawing with a hot pin, the drawing point is fixed on the hot pin, the crimp rate (CC) becomes high, the process passability becomes poor during weaving and weaving, and the crimp rate (CC) becomes high temperature crimp rate (HC). ) Or more.

  Further, if DR1 is less than 1.000, the yarn is loosened and cannot be produced on the stretching machine table, and if DR2 is less than MDR × 0.65, necking occurs due to insufficient stretching, resulting in thickening due to thick spots during dyeing. A color portion and a light color portion are generated. When MDR × 0.73 is exceeded, the crimp ratio (CC) increases, and yarn breakage occurs in the weaving and weaving process, which makes the process unstable.

  Further, DR1 <DR2 is preferable. When DR1 exceeds DR2, the fiber preheated on the first-stage stretching roller is cold-drawn, so that thick spots may appear on the fiber.

  By setting Tg1 to Tg ≦ TDR1 ≦ Tc−30, the undrawn yarn can be preheated on the first-stage drawing roller and sufficiently drawn in the subsequent second-stage drawing.

  If the TDR2 is less than Tg + 20 ° C., the degree of orientation of the resulting fiber is low and the strength is insufficient, and if it exceeds Tc, the crimping rate increases, resulting in poor processability during knitting.

  Further, the woven or knitted fabric obtained by the method for producing a polyester multifilament fiber of the present invention is made into a fabric using a yarn obtained by twisting the polyester multifilament fiber of the present invention, and subsequently subjected to heat setting, thereby shrinking the fabric. (LC) needs to be 20 to 40%. If the LC is less than 20%, sufficient stretch properties cannot be obtained. If it exceeds 40%, the form of the knitted or knitted fabric is not stable.

  The woven or knitted fabric of the present invention can be obtained, for example, by singly and / or blending the polyester multifilament fibers of the present invention, and then making a woven or knitted fabric by a known method and dyeing it.

  Hereinafter, the present invention will be specifically described by way of examples. In addition, evaluation of the characteristic value in an Example depended on the following method.

(Crimping rate CC)
Create a cocoon of sample yarn with a winding of 10 turns with a frame circumference of 1 m, wrap two places so that the cocoon does not get disturbed, repeat the process twice, making it into a figure of 8 and folding it into two. Then, wrap in gauze, put in a wire mesh box so that it will not float when immersed in a water bath, and immerse in a thermostat adjusted to 90 ° C. for 20 minutes. Remove the wire mesh box from the thermostatic chamber, drain the water, and place it on the filter paper so that the sputum is not disturbed. Leave it for 20 hours or more and let it dry naturally and loosen any excess entanglement, taking care not to stretch the crimp.

Apply an initial load of 49/25000 cN × 20 per display decitex (1.1 dtex) and measure the length (L0) after 1 minute. After weighing the initial load, apply a measurement load of 49/500 cN × 20 per display decitex, measure the length (L1) after 1 minute, leave it for 2 minutes after dewetting, and then reapply the initial load and 1 minute later Measure the length (L2). The crimp rate CC is calculated by the following formula.
Crimp rate CC (%) = (L1-L2) / L1 × 100

(High temperature crimp rate (HC))
Create a cocoon with a sample circumference of 1m and wrapping 10 times with a frame circumference of 1m, wrap two places so that the cocoon is not disturbed, and repeat the process of making a circle by folding it into a figure of 8 and folding it twice. . The soot is put into a pot adjusted to a water temperature of 40 ° C., heated to 70 ° C. at a heating rate of 4 ° C./min, and then heated to 130 ° C. at a heating rate of 2 ° C./min. After keeping at 130 ° C. for 20 minutes, the temperature is lowered to 60 ° C. at a temperature lowering rate of 4 ° C./minute, and then the water is taken out and drained and placed on a filter paper so as not to disturb the water.

Leave it for 20 hours or more and let it dry naturally and loosen any excess entanglement, taking care not to stretch the crimp. Apply an initial load of 49/25000 cN × 20 per display decitex (1.1 dtex) and measure the length (H0) after 1 minute. After weighing the initial load, apply a measurement load of 49/500 cN × 20 per display decitex, measure the length (H1) after 1 minute, leave it for 2 minutes after dewetting, and then reapply the initial load and 1 minute later Measure the length (H2). The high temperature crimp ratio (HC) is calculated by the following formula.
High temperature crimp rate HC (%) = (H1-H2) / H1 × 100

(Elongation (DE))
Using an autograph system SD-100-C manufactured by Shimadzu Corporation, measurement was performed under the conditions of a sample length of 20 cm and a tensile speed of 20 m / min.

(Textile shrinkage (LC))
The sample yarn is twisted under the conditions of a twist coefficient K = 100 (T = K × √DT is the number of twists per meter, D is the fineness of the sample yarn), and the temperature is 70 ° C. and the humidity is 90% RH. Using the yarn set for 40 minutes as the weft, the number of driven yarns (number / cm) = 311.1 / √D from the fineness (D) of the sample yarn, and the warp yarn density was set to 39.6 yarns / cm After weaving the original 56 dtex 18 filament yarn as warp, the fabric is marked at intervals of 1 m in the weft direction (M0), and a 10 cm wide sample cloth is cut out parallel to the weft, and heated at 130 ° C. for 30 minutes. Treat with water. After air-drying the sample fabric treated with hot water, one end is fixed and hung vertically, a load of 0.45 g / dtex is applied to the other end below, and the distance (M1) between the first marks is measured to shrink the fabric. Calculated as ratio (LC) = (M0−M1) / M0 × 100.

(Intrinsic viscosity [η])
The polymer was dissolved in a 1: 1 mixed solvent of phenol and tetrachloroethane and measured at 25 ° C. using an Ubbelohde viscometer.

(Textile texture)
A woven fabric made of sample yarn was prepared, and the tensile elasticity of the sample woven fabric was evaluated according to the following criteria by a sensory test using tactile sensation.
○: Both elongation and impact resilience are very good. Δ: Both elongation and impact resilience are good. ×: Both elongation and impact resilience are insufficient.

Example 1
Polyethylene terephthalate having an intrinsic viscosity of 0.647 obtained by copolymerizing 8 mol% of isophthalic acid (IPA) with polyethylene terephthalate is polymer (A), polyethylene terephthalate having an intrinsic viscosity of 0.484 is polymer (B), and the spinning temperature is 290. The temperature was set to 0 ° C., and two types of polymer streams were joined in plane symmetry upstream of the spinning discharge holes, and 24 discharge holes having a pore diameter of 0.6 mm and a length of 1.5 mm at a joining ratio (weight ratio) of 5/5 were obtained. Spinning was performed from a composite spinneret. The spun yarn was cooled and oiled, and then wound up at a take-up speed of 2100 m / min to obtain an undrawn yarn of 228 dtex / 24 filament. Tg is 70 ° C. Tc was 145 ° C.

  The undrawn yarn was drawn under the conditions shown in Table 1 to obtain a polyester multifilament fiber of 109 dtex / 24 filament.

  After the drawn yarn was twisted, it was wet-heat set at 70 ° C., used for warp and weft, and woven poplin at the green density of the conditions shown in Table 1. This raw machine was dried with a liquid dyeing machine manufactured by Onomori Iron Works using a solution containing 1 g / l soda ash and 0.5 g / l surfactant in combination at 120 ° C. for 20 minutes. . Next, heat setting was performed with a pin tenter manufactured by Ichikin Kogyo Co., Ltd. without applying tension in the warp and weft directions of the fabric at a dry heat of 180 ° C. for 30 seconds.

  Next, an alkali weight loss treatment was performed using a liquid dyeing machine to reduce the weight by 20% by mass. Thereafter, the disperse dye DianixBlackBG-FS200 was added to the liquid dyeing machine manufactured by Onomori Iron Works, 15o. w. After dyeing at f%, dyeing temperature 130 ° C., time 30 minutes, the L value of the fabric was measured.

  Table 1 shows the evaluation results of the polyester multifilament fibers and fabrics obtained.

(Example 2)
An undrawn yarn of 115 dtex / 12 filaments was obtained with a composite spinneret having 12 discharge holes using the same polymer as in Example 1 and under the same spinning conditions.

  The undrawn yarn was drawn under the conditions shown in Table 1 to obtain a polyester multifilament fiber of 55 dtex / 12 filament. In addition, a woven fabric was obtained in the same manner as in Example 1 using the fiber.

  Table 1 shows the evaluation results of the polyester multifilament fibers and fabrics obtained.

(Example 3)
An undrawn yarn of 62 dtex / 12 filaments was obtained with a composite spinneret having 12 discharge holes using the same polymer as in Example 2 and under the same spinning conditions.

  The obtained undrawn yarn was drawn under the conditions shown in Table 1 to obtain a 33 dtex / 12 filament polyester multifilament fiber. In addition, a woven fabric was obtained in the same manner as in Example 1 using the fiber.

  Table 1 shows the evaluation results of the polyester multifilament fibers and fabrics obtained.

(Comparative Example 1)
The unstretched yarn obtained in Example 1 was passed through a pair of heat pins, the first frictional resistance pin was 80 ° C., the second frictional resistance pin was 150 ° C. and the draw ratio was 2.11 times (MDR × 0.71). ) To obtain a polyester multifilament fiber of 109 dtex / 24 filament, and using this fiber, a woven fabric was obtained in the same manner as in Example 1.

  Table 1 shows the evaluation results of the polyester multifilament fibers and fabrics obtained. Fluff and thread breakage occurred during weaving, and the process passability was poor.

(Comparative Example 2)
The unstretched yarn obtained in Example 2 was passed through a pair of heat pins, the first frictional resistance pin was 80 ° C., the second frictional resistance pin was 150 ° C. and the draw ratio was 2.11 times (MDR × 0.71). ) To obtain a polyester multifilament fiber of 55 dtex / 12 filament, and using this fiber, a woven fabric was obtained in the same manner as in Example 1.

  Table 1 shows the evaluation results of the polyester multifilament fibers and fabrics obtained. Fluff and thread breakage occurred during weaving, and the process passability was poor.

(Comparative Example 3)
The undrawn yarn obtained in Example 3 was drawn under the conditions shown in Table 1 to obtain a 33 dtex / 12 filament polyester composite multifilament fiber, and the fabric was used in the same manner as in Example 1 using the fiber. Obtained.

  Table 1 shows the evaluation results of the polyester multifilament fibers and fabrics obtained. Fluff and thread breakage occurred during weaving, and the process passability was poor.

Claims (2)

A polyester multifilament fiber comprising a single fiber in which two kinds of polyester polymers having different melt viscosities are joined, and satisfying the following requirements (1) to (3) simultaneously as a multifilament fiber.
(1) 20 ≦ crimp rate (CC) ≦ 50 (%),
(2) 25 ≦ high temperature crimp rate (HC) ≦ 60 (%),
(3) HC> CC
However, the crimp ratio (CC) is a crimp ratio measured at 90 ° C. for 20 minutes under wet heat treatment conditions, and the high temperature crimp ratio (HC) is a crack measured at 130 ° C. for 20 minutes under wet heat treatment conditions. Reduction rate.   The polyester maltofilament fiber according to claim 1, wherein the high viscosity component of two polyester polymers having different melt viscosities is a copolymerized polyethylene terephthalate obtained by copolymerizing 5 to 15 mol% of the third component.