JP4884954B2 - Cationic dyeable composite fiber and fiber product containing the same - Google Patents

Description

  The present invention relates to a composite fiber having excellent dyeability and strong elongation characteristics for a cationic dye and having a soft texture, and a fiber product including the composite fiber.

  Conventionally, various different materials are used in the embroidery race field. For example, rayon or cotton is mainly used for the embroidery thread, and nylon is mainly used for the cup thread that is the back thread of the embroidery. Nylon and silk have been used for tulle lace, organdy, which is the base fabric for embroidery.

  In the field of embroidery lace, various fiber materials are mixed as described above, so atmospheric dyeing is essential for dyeing, and each fiber requires a pre-dyeing process. There was a problem that the process was complicated. In order to remedy the above problems, attempts have been made to use cationic dyeable dyeable polyester fibers, which can be dyed at normal pressure and have excellent sharpness, in all embroidery threads and base fabrics. There is an increasing demand for embroidery products with excellent dyeing and sharpness.

  For example, in Japanese Patent Laid-Open No. 06-166910 (Patent Document 1), as a countermeasure against perforation, the main repeating unit is composed of polyethylene terephthalate, and 1.5 to 3.5 mol% of 5-sodium sulfoisophthalic acid and 2. A modified polyester copolymerized with 0 to 7.0 mol% is disposed in the sheath portion, and a polyester having 95 mol% or more of polyethylene terephthalate is disposed in the core portion, and the area ratio of the core portion to the sheath portion in the fiber cross section is 4 Polyester fiber for embroidery having a fineness of 3 denier or less, a breaking strength (DS) of 4.0 g / denier or more, and a breaking elongation (DE) of 30% or more. Yes.

JP 59-30912 (Patent Document 2) discloses that, as a countermeasure for obtaining higher strength and normal pressure dyeability, 85 mol% or more is an ethylene terephthalate unit, and 3 to 6 mol%. A composite fiber having a polyester having an ethylene-5-sodium sulfoisophthalate unit as a sheath component and a polyamide as a core component is described.

However, the conventional cationic dyeable polyester fiber has low strength and elongation characteristics compared to normal polyester fiber, and the base fabric cannot withstand the entry of the embroidery thread during the embroidery process, and is easily broken. Many perforations occurred, causing problems in process passability and merchantability.
Japanese Patent Laid-Open No. 06-166910 JP 59-30912 A

  An object of the present invention is to provide a cationic dyeable composite fiber having a soft texture that can be dyed at atmospheric pressure, exhibits vivid dyeability, and exhibits high strength and elongation characteristics. It is to provide textile products such as broiler lace.

The first gist of the present invention is a sheath comprising a modified polyester in which the main repeating unit is composed of polyethylene terephthalate, and the dicarboxylic acid component contains 1 to 3 mol% of 5-sodium sulfoisophthalic acid unit and 3 to 10 mol% of adipic acid unit. A cationic dyeable composite fiber having a core / sheath volume ratio of 1/1 to 4/1 and having a breaking strength (DS) of 4 cN / dtex or more. The cationic dyeable composite fiber having a breaking elongation (DE) of 40% or more and a DS × (DE) ^1/2 of 27 or more.

Moreover, the 2nd summary exists in the textiles containing the said cationic dyeable conjugate fiber.

  The present invention is a cationic dyeable composite fiber that is dyeable with a cationic dye, capable of normal pressure dyeing, and has improved strength and elongation characteristics, and a swimsuit and a sports inner using the cationic dyeable composite fiber Textile products such as lingerie and foundation have vivid dyeability, good strength and elongation properties, and soft texture. In particular, an embroidery lace using the above-mentioned fibers is a product which does not have a hole in the embroidery process and has a good dyeing quality. Furthermore, by making both the embroidery thread and the base fabric cationically dyeable, one-step dyeing after the embroidery process is possible.

  Hereinafter, the composite fiber of the present invention will be described in detail.

The cationic dyeable conjugate fiber according to the present invention has a breaking strength (hereinafter referred to as DS) of 4 cN / dtex or more, a breaking elongation (hereinafter referred to as DE) of 40% or more, and DS × (DE) ^1/2 of When it has a strong elongation characteristic of 27 or more and DS is less than 4 cN / dtex, DE is less than 40%, and DS × (DE) ^1/2 is less than 27 In the embroidery process, the fiber cannot withstand the frictional force against the ingress of the fiber, and a hole is generated in the resulting embroidery lace.

In the present invention, the modified polyester disposed in the sheath portion of the cationic dyeable conjugate fiber is dyeable with a cationic dye and exhibits normal pressure dyeability, and the main repeating unit is composed of polyethylene terephthalate, As the dicarboxylic acid component, 1 to 3 mol% of 5-sodium sulfoisophthalic acid units and 3 to 10 mol% of adipic acid units are copolymerized and contained .

When the amount of adipic acid in the range of 1 to 3 mol% of 5-sodium sulfoisophthalic acid is less than 3 mol%, the dyeability in atmospheric dyeing is lowered. If it exceeds 10 mol%, the melting point will be lowered, and it will not be able to withstand the heat setting of about 200 ° C. in the processing step, and holes will be generated.

  In addition, the intrinsic viscosity is preferably about 0.46 to 0.63, and when it is less than 0.46, the viscosity difference from the core component becomes too large, and a uniform core-sheath composite cross section is stably obtained. It becomes difficult. If the intrinsic viscosity exceeds 0.63, the melt viscosity becomes too high due to the thickening action of 5-sodium sulfoisophthalic acid, and the yarn-making property deteriorates.

As the polyamide to be disposed on the core, conventionally known materials such as nylon 6, nylon 66, nylon 4, nylon 7, nylon 11 and nylon 12 can be used. Among these, nylon 6 is preferable from the viewpoint of versatility. Copolymer polyamides such as nylon 6 and nylon 66 or nylon 6 and nylon 12 can also be used.

  The volume ratio of the core / sheath to the core-sheath fiber cross section needs to be in the range of 1/1 to 4/1. When the volume ratio of the core / sheath is lower than 1/1, the strength and elongation characteristics of the fiber are lowered, and perforation occurs in the embroidery process. On the contrary, when the volume ratio of the core / sheath exceeds 4/1, it becomes difficult to stably obtain a uniform core / sheath composite cross section, and the atmospheric pressure cationic dyeability of the fiber is lowered.

  Next, an example is given and demonstrated in detail about the manufacturing method of the cationic dyeable conjugate fiber of this invention. First, for spinning, the main repeating unit is composed of polyethylene terephthalate, and a modified polyester obtained by copolymerizing 1 to 3 mol% of 5-sodiumsulfoisophthalic acid and 3 to 10 mol% of adipic acid as a dicarboxylic acid component is used as a sheath. The polyamide is disposed in the core, and a core-sheath type composite fiber having a core / sheath volume ratio of 1/1 to 4/1 is obtained.

  Next, the undrawn yarn is drawn as follows using a twisting machine. First, the draw ratio in the first stage draw area is set to a range of more than 1 and less than 1.2, which is a ratio that does not allow the yarn to sag. Next, it is heated with a take-up roller in the first-stage stretching zone heated to 60 to 90 ° C. and exceeds 0.6 times the maximum draw ratio (hereinafter referred to as MDR) in the second stretching zone, and less than 0.8 times. It heat-sets with the hot plate | board of the 2nd extending | stretching area | region extended | stretched by the magnification of the range and heated to 100-170 degreeC.

  When the draw ratio of the first stage drawing region is 1 or less, yarn slack occurs and winding around the roller occurs. On the other hand, if it is 1.2 times or more, stretched spots are generated and the quality after dyeing is lowered.

  The surface temperature of the take-up roller in the first-stage drawing region is in the range from the glass transition temperature of the polyester of the sheath component having a relatively high glass transition temperature of the polymer to (glass transition temperature + 30 ° C.), that is, 60 ° C. or more. And about 90 ° C. or less. If the surface temperature of the take-up roller in the first stage drawing region is out of the above range, drawing spots are generated and the quality after dyeing is lowered.

  If the draw ratio of the second-stage drawing region is 0.6 times or less of MDR, the DS of the fiber is excessively lowered, and the DS cannot be maintained at 4 cN / dtex or more. On the other hand, if the MDR is 0.8 times or more, the DE of the fiber is excessively lowered, and the DE cannot be maintained at 40% or more.

  The surface temperature of the hot plate in the second stage stretching region is preferably 100 to 170 ° C. When the temperature is less than 100 ° C., the shrinkage ratio of the fibers increases, and the texture of the woven or knitted fabric tends to become hard. When the temperature exceeds 170 ° C., yarn breakage is likely to occur in the drawing process.

  In addition, textile products such as swimwear, sports inners, lingerie, foundations and embroidery laces containing the cationic dyeable conjugate fiber of the present invention may be used independently of the cationic dyeable conjugate fiber of the present invention. The base fabric of the embroidery lace may be contained in the base fabric constituting the embroidery lace in order to reduce the perforation of the base fabric and improve the dyeing quality. The cationic dyeable conjugate fiber is preferably contained in an amount of 50% by mass or more.

  Further, the combination of the base fabric using the cationic dyeable conjugate fiber of the present invention and the embroidery thread using another cationic dyeable fiber enables one-step dyeing after the embroidery process.

  Hereinafter, the present invention will be specifically described with reference to Examples 1 to 6 and Comparative Examples 1 to 3. In addition, each evaluation followed the following method.

(Intrinsic viscosity of modified polyester [η])
0.25 g of polymer was pulverized, dissolved in 50 ml of a mixed solvent of phenol / tetrachloroethane (50/50), and temperature-controlled at 25 ° C. (manufactured by Sun Electronics Co., Ltd., product name: AVL-4 type) ). The calculation formula is as follows.

[Η] = {(1 + 1.04ηsp) ^1/2 −1} /0.26
(Nylon melt viscosity (Pa · sec))
The polymer was melted at a temperature of 280 ° C. in a nitrogen atmosphere, and the melt viscosity when the share rate was 2.43 × 10 ³ sec ⁻¹ was obtained using a capillograph (product name: Capillograph 1B, manufactured by Toyo Seiki Seisakusho Co., Ltd.). The measurement was performed three times, and the average value was taken as the melt viscosity.

(Melting point of polymer)
Using a DSC220 manufactured by Seiko Denshi Kogyo Co., Ltd., the temperature was increased at a rate of 10 ° C./min.

(Fiber breaking strength (DS) and breaking elongation (DE))
Using an autograph SD-100-C manufactured by Shimadzu Corporation, a stress elongation curve was measured at a test length of 200 mm and a tensile speed of 200 mm / min, and the strength and elongation at the breaking point of the fiber were determined.

(Evaluation of dyeability by cationic dyeing)
A cationic dye (made by Hodogaya Chemical Co., Ltd., product name: AIZEN CATHILOON MARINEBLUE GPLH) is dyed at a concentration of 1.5% owf and a temperature of 98 ° C. for 60 minutes, and has excellent sharpness and leveling. O and x were evaluated in three stages.

The following examples illustrate the invention.

Example 1
Nylon 6 (melting point 224 ° C., melt viscosity 170 Pa · sec) was melted to 260 ° C., 5-sodium sulfoisophthalic acid (hereinafter referred to as DMS) 2.25 mol%, and adipic acid (hereinafter referred to as ADE) 5 mol %, A modified polyester having a melting point of 242 ° C. and an intrinsic viscosity of 0.55 is melted to 280 ° C., then nylon 6 is arranged in the core portion, modified polyester is arranged in the sheath portion, and the core portion / sheath portion = 2. / 1 (volume ratio), core-sheath type composite spinning was performed at a spinning temperature of 280 ° C. and a winding speed of 1400 m / min to obtain an undrawn yarn. Next, it was stretched under the following conditions to obtain a stretched yarn of 40 dtex / 16f. The stretch properties of the obtained drawn yarn are DS 4.16 cN / dtex, DE 47.6%, DS × (DE) ^1/2 = 28.7, which is a very high level as a cationic dyeable fiber. Yes, and at a sufficient level for an embroidery base fabric.

DR1 = 1.011
HR = 68 ° C
DR2 = 2.154 (MDR × 0.7)
HP = 125 ° C
However, DR1: Stretch ratio in the first stage stretch zone
MDR: Maximum draw ratio measured at a preheating temperature of 70 ° C.
HR: Surface temperature of take-up roller in the first stage drawing area (° C.)
DR2: Stretch ratio in the second stage stretch zone
HP: Surface temperature (° C) of the hot plate in the second stage drawing zone
Furthermore, as a result of dyeing the obtained knitted tubular knitted fabric with a cationic dye (AIZEN CATHILON MARINEBLUE GPLH manufactured by Hodogaya Chemical Co., Ltd.) at a concentration of 1.5% owf, a temperature of 98 ° C. for 60 minutes, sharpness and leveling were obtained. Excellent texture and very soft texture was obtained.

(Example 2)
A drawn yarn was obtained using the same polymer as in Example 1 except that the volume ratio of the core part to the sheath part was changed to 3/1. The obtained stretched yarn had a high elongation characteristic at a very high level for a cationic dyeable fiber and a sufficient level for an embroidery base fabric. Using the drawn yarn, a tubular knitted fabric was prepared and dyed in the same manner as in Example 1. As a result, a sharp texture and a very soft texture were obtained.

(Example 3)
A drawn yarn was obtained in the same manner as in Example 1 except that the core component polyamide was changed to a copolymerized polyamide (melting point: 203 ° C., melt viscosity: 188 Pa · sec) obtained by copolymerizing nylon 6 and nylon 66. The obtained stretched yarn had a high elongation characteristic at a very high level as a cationic dyeable fiber and a sufficient level for an embroidery base fabric. Using the drawn yarn, a tubular knitted fabric was prepared and dyed in the same manner as in Example 1. As a result, a sharp texture and a very soft texture were obtained.

Example 4
A drawn yarn was obtained in the same manner as in Example 1 except that the polyamide as the core component was changed to nylon 12 (melting point: 178 ° C., melt viscosity: 190 Pa · sec). The obtained stretched yarn had a high elongation characteristic at a very high level as a cationic dyeable fiber and a sufficient level for an embroidery base fabric. Using the drawn yarn, a tubular knitted fabric was prepared and dyed in the same manner as in Example 1. As a result, a sharp texture and a very soft texture were obtained.

(Example 5)
A drawn yarn was obtained in the same manner as in Example 1 except that the modified polyester as the sheath component was changed to a polymer having a modified amount of DMS of 1.5 mol%, a melting point of 244 ° C., and an intrinsic viscosity of 0.64. The obtained stretched yarn had a high elongation characteristic at a very high level as a cationic dyeable fiber and a sufficient level for an embroidery base fabric. Using the drawn yarn, a tubular knitted fabric was prepared and dyed in the same manner as in Example 1. As a result, a sharp texture and a very soft texture were obtained.

(Example 6)
A drawn yarn was obtained in the same manner as in Example 1 except that the modified polyester as the sheath component was changed to a polymer having a modified amount of ADE of 9 mol%, a melting point of 234 ° C., and an intrinsic viscosity of 0.59. The obtained stretched yarn had a high elongation characteristic at a very high level as a cationic dyeable fiber and a sufficient level for an embroidery base fabric. Using the drawn yarn, a tubular knitted fabric was prepared and dyed in the same manner as in Example 1. As a result, a sharp texture and a very soft texture were obtained.

(Comparative Example 1)
A stretched yarn was obtained in the same manner as in Example 1 except that the modified polyester as the sheath component was changed to a polymer having a modified amount of DMS of 5 mol%, a melting point of 237 ° C., and an intrinsic viscosity of 0.41. The strength and elongation characteristics of the drawn yarn were at a low level and were insufficient even for an embroidery base fabric.

(Comparative Example 2)
A drawn yarn was obtained in the same manner as in Example 1 except that the modified polyester as the sheath component was changed to a polymer having a modified amount of ADE of 5 mol%, a melting point of 245 ° C., and an intrinsic viscosity of 0.75. The strength and elongation characteristics of the obtained drawn yarn were at a very high level and sufficient for an embroidery base fabric. However, the drawn yarn was used in the same manner as in Example 1 using the drawn yarn. When the knitted fabric was prepared and dyed, the dyeability was extremely low.

(Comparative Example 3)
The core component was changed to polyethylene terephthalate (melting point: 255 ° C., intrinsic viscosity: 0.83, melt viscosity: 201 Pa · sec), and the melt temperature of the core component and the spinning temperature were changed to 290 ° C. Thus, a drawn yarn was obtained. The strength and elongation characteristics of the obtained drawn yarn were higher than those of conventional cationic dyeable fibers, but were insufficient for embroidery base fabrics.

It is the schematic which shows the whole content of a three-stage stretcher. It is the schematic which shows the whole content of a two-stage stretcher.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Undrawn yarn 2 Supply roller 3 Take-up roller in the first stage drawing area
4 Take-up roller in the second stage stretch zone
4 'hot plate in the second stage drawing zone 5 hot plate in the third stage drawing zone 6 take-up roller in the third stage drawing zone 7 drawn yarn

Claims (2)

The main repeating unit is composed of polyethylene terephthalate, a modified polyester containing 1 to 3 mol% of 5-sodiumsulfoisophthalic acid unit and 3 to 10 mol% of adipic acid unit as a dicarboxylic acid component is arranged in the sheath, and polyamide in the core A cationic dyeable composite fiber having a core / sheath volume ratio of 1/1 to 4/1 , having a breaking strength (DS) of 4 cN / dtex or more and a breaking elongation (DE) of 40. %, And the dyeable composite fiber having DS × (DE) ^1/2 of 27 or more. A textile product comprising the cationic dyeable conjugate fiber according to claim 1 .

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