JP2009197361A - Stretchable sheath-core conjugate yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stretchable sheath-core conjugate yarn having excellent heat-resistance and flame-retardancy and a fabric composed of the yarn. <P>SOLUTION: The stretchable sheath-core conjugate yarn is composed of a sheath yarn comprising a flame-retardant heat-resistant fiber yarn and a core yarn comprising a polyester filament yarn, wherein the core yarn is a drawn yarn of a side-by-side conjugate yarn composed of two kinds of polyesters having an intrinsic viscosity difference of 0.1-0.4 dL/g measured in o-chlorophenol solvent at 30°C. Preferably, the flame-retardant heat-resistant fiber yarn is twined as the sheath yarn in an alternately reversing manner while partly mixing and interlacing with the core yarn. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stretchable composite false-twist yarn and a stretchable composite yarn that can create a fabric having high stretchability and excellent in heat resistance, texture, and appearance.

  Conventionally, as heat-resistant protective clothing worn by firefighters during firefighting work, protective clothing made of non-combustible asbestos fibers or glass fibers has been used, but environmental problems (health problems) and ease of work (easy to move) In recent years, flame retardant organic fibers such as aramid, polyphenylene sulfide, polyimide, and polybenzimidazole have been used. In addition, for the purpose of preventing radiant heat activated by flame, these flame retardant fibers are used. Many of these fabrics are surface-treated with metallic aluminum or the like by a coating method or a vapor deposition method. Further, it has been proposed to reduce the weight by a method (Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4) having an air layer on a flame retardant yarn or fabric. Although flame retardancy, heat resistance, etc. are certainly improved, there is a problem that workability and wearing feeling are poor because the yarn and thus the fabric is not stretchable.

  About the cloth which has a flame retardance and has a stretching property, as disclosed in Patent Document 5 and Patent Document 6, the elastic yarn is used to impart the elasticity and the flame retardant is used to impart the flame resistance. Although fabrics and clothes have been disclosed, heat resistance is low and flame retardancy is not sufficient.

  In addition, for yarns and fabrics having heat resistance and flame retardancy, as disclosed in Patent Literature 7 and Patent Literature 8, para-aramid heat resistant crimped yarn is used for elasticity and flame retardancy. Fabrics and clothes having heat resistance and heat resistance are disclosed, but there is a problem and cost that the stretchability of the crimped yarn is lowered in the fabric processing step such as weaving, scouring, and dyeing, and sufficient stretchability cannot be obtained as a fabric. There was a problem of becoming higher.

Japanese Patent Laid-Open No. 2000-21280 JP 2000-214318 A JP 2002-115106 A JP 2004-197259 A JP 2000-248450 A JP 2006-124865 A JP 2001-248027 A JP 2005-307429 A

  The present invention relates to a stretchable core-sheath composite yarn excellent in flame retardancy and heat resistance, and a fabric comprising the same, which solves the above-described problems of the prior art.

  As a result of intensive studies to achieve the above object, the present inventors have found that a core-sheath-type composite yarn in which the core yarn is a polyester filament yarn and the sheath yarn is a flame-retardant fiber yarn, and the core yarn is in an orthochlorophenol solvent. Stretch characterized in that it is a drawn yarn of conjugate yarn in which two kinds of polyesters having a difference in intrinsic viscosity measured at 30 ° C. in the range of 0.1 to 0.4 dL / g are bonded to a side-by-side type. Core-sheath type composite yarn is provided.

  The core yarn is a highly shrinkable polyethylene terephthalate copolymerized with 8 to 15 mol% of isophthalic acid and / or a bisphenol A compound, and a low shrinkage of [η] f (fiber intrinsic viscosity) of 0.36 to 0.47. It consists of a drawn yarn of conjugate yarn with a degree of elongation of 25-45%, which is a side-by-side composite of polyethylene terephthalate, and the sheath yarn is a wholly aromatic polyamide fiber, especially a meta-type wholly aromatic polyamide fiber and a paraffin having a buckling part. Core-sheath type composite yarn (false twisted yarn) comprising a spun yarn in which a system aramid fiber is uniformly mixed and wound in an alternating inversion while partially mixed and entangled with the core yarn, more preferably A covering yarn type core-sheath type composite yarn in which a sheath yarn is formed by spirally turning a core yarn in different directions is provided.

  By using the flame retardant stretch core-sheath composite yarn of the present invention as a fabric by a fabric processing step such as weaving, scouring, and dyeing, the polyester multifilament yarn of the core yarn is crimped in the heat step and has stretch properties. It becomes a thread and can impart stretch properties to the fabric. Since stretchability can be imparted without lowering stretchability by a tension in a conventional processing step or a heat step, a fabric having flame retardancy, heat resistance, and stretchability can be obtained. Also, by using a sheath yarn as a spun yarn, even if a high heat resistance and high rigidity flame retardant yarn is used, both softness and high flame resistance and heat resistance can be achieved, and combined with stretchability, it can be made a useful fireproof protective clothing. .

  Examples of the flame retardant fiber used in the present invention include aramid fiber, polybenzimidazole fiber, polyimide fiber, polyvinyl chloride fiber, polyetherimide fiber, polyarylate fiber, polyparaphenylene benzobisoxazole fiber, noboroite fiber, flame retardant It is at least one fiber selected from the group consisting of acrylic fiber, polyclarate fiber, flame retardant polyester fiber, flame retardant cotton fiber, flame retardant wool fiber, flame retardant rayon fiber, and a combination of one or more of these heat resistant fibers, Alternatively, it is preferable to use a non-heat-resistant fiber together with a certain amount or more so that the heat-resistant performance exceeds the standard value to make it flame-retardant and heat-resistant.

  Polymetaphenylene isophthalamide, which exhibits an excellent LOI (Limiting Oxygen Index) value among flame retardant heat resistance, and is capable of being dyed white and dyed, is very useful in preparing protective clothing. Furthermore, it is also preferable to mix para-aramid fibers, that is, polyparaphenylene terephthalamide or fibers obtained by copolymerizing a third component thereto.

  Here, filament yarn and spun yarn can be used as the sheath yarn. Among them, when using a highly rigid fiber such as an aramid fiber as the spun yarn, the softness of the fabric, the cost adjustment, and the dyeing processability Is preferable.

  Further, in order to further improve the dyeability of polyparaphenylene terephthalamide, polyparaphenylene terephthalamide (PPTA) fibers in which buckling portions (kink band portions) are formed by physical means such as push-in crimps are used. It is preferable. At that time, PPTA is dissolved in concentrated sulfuric acid, the viscous solution is extruded from a spinneret, and is made into a filament by spinning in air or water, and then neutralized with an aqueous sodium hydroxide solution. It is obtained by drying and heat treatment at 120 to 500 ° C., but the PPTA fiber before drying and heat treatment is a general PPTA fiber having a crystal size (110 face) of less than 50 mm, and becomes 50 mm or more after drying and heat treatment. If present, the dyeability is further improved.

  The polyester conjugate yarn used for the core yarn has a fiber cross section in which two types of melt-spun fibers having different intrinsic viscosities are bonded to each other in a side-by-side manner. The intrinsic viscosity difference between the two types of polyester is 0.1 to 0.4 dL / g, preferably 0.15 to 0.30 dL / g. When the intrinsic viscosity difference is less than 0.1 dL / g, the heat shrinkage between the bonded components, particularly the wet heat shrinkage difference, is insufficient, and the latent crimping performance as a conjugate yarn is insufficient. If it exceeds 0.4 dL / g, stable yarn production becomes difficult.

  These polyesters contain optional additives such as antioxidants, ultraviolet absorbers, heat stabilizers, flame retardants, titanium oxides, colorants, and inert fine particles as long as the object of the present invention is not impaired. May be.

In the flame-retardant heat-resistant core-sheath composite yarn of the present invention, it is important that the flame-retardant heat-resistant fiber yarn of the sheath yarn is wrapped around the core yarn.
As a method of constructing the core-sheath structure having such a structure, it can be mixed and entangled through a known false twisting process, and more preferably a composite yarn having a structure in which the sheath yarn turns the core yarn. An example of a method for producing a composite yarn having a structure in which a sheath yarn turns a core yarn is a covering yarn method. That is, a covering yarn is produced by a known method using the above polyester conjugate yarn as a core yarn and a flame-retardant heat-resistant yarn as a sheath yarn. Single or double covering may be used. A double covering yarn is preferable from the viewpoint of enhancing the flame resistance and heat resistance.

  The flame-retardant heat-resistant composite yarn of the present invention is used to form a fabric by knitting, scouring, dyeing, and relaxing processes. In this series of steps, the crimp property of the polyester conjugate yarn of the core yarn is developed especially in wet heat processing, whereby the stretch property of the composite yarn and thus the fabric can be obtained.

  The dyeing method for the flame-retardant heat-resistant composite yarn of the present invention does not require special equipment or special methods, and can use existing synthetic fiber dyeing equipment. As the dye, any of a cationic dye, a disperse dye, and even a cation / dispersed mixed dye can be used. However, it easily penetrates into a dense structure, and the dyeing property is generally an ionic bond, and after dyeing. Cationic dyes with good fastness and hue stability are desirable.

  The cationic dye is a water-soluble dye that is soluble in water and has a basic group, and is often used for dyeing acrylic fibers, natural fibers, or cationic dyeable polyester fibers. Type, quinoneimine (azine, oxazine, thiazine) type, xanthene type, methine type (polymethine, azamethine), heterocyclic azo type (thiazole azo, triazole azo, benzothiazole azo), anthraquinone type, and the like. Recently, there is a cationic dye which is made water-dispersible by blocking a basic group, but both can be used.

  The dyeing temperature is preferably 115 ° C or higher and 150 ° C or lower, more preferably 120 ° C or higher. If the dyeing temperature is 115 ° C. or lower, the dyeability may be insufficient. Also, the higher the dyeing temperature, the higher the dyeing property, but on the other hand, if the dye is decomposed or aramid fiber is combined with other materials, problems of deterioration of the composite material will begin to occur. About 140 ° C. is preferable even if it is not high.

  The carrier is at least selected from methanol, ethanol, propanol, isopropyl alcohol, benzyl alcohol, acetone, acetophenone, NMP, DMSO, DMF, ethylene glycol, acetonitrile, propylene or ethylene glycol phenyl ether, or a commercially available carrier and swelling agent. Although it is characterized by dyeing using 1 or more types, it is preferable to use the carrier which considered environmental load reduction suitable for the dyeing environment (processing capacity, work environment, etc.).

  The above-mentioned fabric is cut and sewn according to a conventional method. In order to improve antifouling properties such as water and oil repellency, a film is formed on the surface, and in order to improve fire resistance and thermal protection, it is composed of a surface layer and an inner layer using the above fabric, and two layers are laminated. preferable.

Hereinafter, an example is given and the composition and effect of the present invention are explained in detail.
In addition, the evaluation method of the to-be-dyed object performed by the Example / comparative example was performed according to the following method.
Using a tensile tester with an automatic recording device, a test piece having a stretch rate and an elongation recovery rate of 5 × 20 cm was grasped so as to have an initial load of 20 g and an interval of 10 cm, and a load-extension curve was drawn. The extension distance at this time was L. Then, immediately returned to the original position, the residual elongation was Rcm.
Stretch rate = ((L-10) / 10) * 100 (%)
Elongation recovery rate = ((LR) / L) * 100 (%)

[Example 1]
Obtained by drawing and heat-treating a conjugate yarn in which polyethylene terephthalate having an intrinsic viscosity of 0.64 obtained by copolymerization of isophthalic acid at least 10 mol% and polyethylene terephthalate having an intrinsic viscosity of 0.42 are bonded side by side at a weight ratio of 50/50. , 50 denier / 12 filament, 35% elongation, 14% boiling water shrinkage was prepared.

  The obtained drawn yarn is used as a core yarn, and the sheath fiber is made of short fibers made of polymetaphenylene isophthalamide (trade name: Cornex, manufactured by Teijin Techno Products Co., Ltd.) and polyparaphenylene terephthalamide (trade name: Teijin Twaron, Twist yarn by double covering method (Z) using two spun yarns (cotton count No. 40) made of heat-resistant fibers in which short fibers made of Teijin Aramid Co., Ltd. are mixed almost uniformly at a ratio of 90:10 ) And upper twist (S) to obtain a core-sheath composite yarn.

The obtained composite yarn was woven by a conventional method to form a woven fabric, and subjected to a finishing process of scouring-relax-set (treated at 190 ° C. for 1 minute) -dye-set. Here, the relaxation temperature was set to 120 ° C., which is higher than usual, and a strong stagnation effect was imparted, whereby the crimp of the conjugate yarn was well expressed, and in particular, stretch properties were expressed. The stretch ratio was 20%, the weft stretch ratio was 23% and the stretchability was good, and the stretch recovery ratio was both 90% or more.
The dyeing was carried out with a dyeing solution provided with a carrier as follows to obtain a uniform and well-dyed fabric.
Further, the heat resistance (LOI) of the obtained dyed fabric was 28.

The temperature was increased from room temperature to 2 ° C./min in the following dye bath, and dyeing was performed at 135 ° C. for 60 minutes.
・ Cationic dye (Kayaacryl Blue GSL-ED) 6% owf
・ Nitric acid Na 25 g / l
・ Acetic acid 0.5 cc / l
・ Benzyl alcohol (carrier) 70 g / l
Bath ratio 1:30
The results are shown in Table 1.

[Examples 2-3, Comparative Examples 1-2]
The same procedure as in Example 1 was conducted except that the polymer characteristics constituting the conjugate or the covering method were changed as shown in Table 1. Moreover, the flame retardancy (LOI) of any dyed fabric was 28.
The results are shown in Table 1.

  It is useful as a heat-resistant protective clothing worn by firefighters during fire extinguishing work, because it maintains flame retardancy and heat resistance and greatly improves workability and wearability.

Claims (9)

  The core yarn is a polyester-filament yarn, the sheath yarn is a core-sheath type composite yarn comprising a flame-retardant fiber yarn, and the core yarn has an intrinsic viscosity difference of 0.1 to 0.1 measured at 30 ° C. in an orthochlorophenol solvent. A stretchable core-sheath type composite yarn characterized in that it is a drawn yarn of a conjugate yarn in which two kinds of polyesters in a range of 0.4 dL / g are bonded in a side-by-side manner.   The stretchable core-sheath composite yarn according to claim 1, wherein the flame-retardant fiber yarn is spirally wound in a direction different from that of the core yarn.   The stretchable core-sheath composite yarn according to claim 1, wherein the flame-retardant fiber yarn is wound as a sheath yarn, alternately inversion while partially mixed with and entangled with the core yarn.   The stretchable core-sheath composite yarn according to any one of claims 1 to 3, wherein the flame-retardant fiber yarn is a spun yarn.   High-shrinkage polyethylene terephthalate copolymerized with 8 to 15 mol% of isophthalic acid and / or bisphenol A compound as the core yarn, and low-shrinkage polyethylene with [η] f (fiber intrinsic viscosity) of 0.36 to 0.47 The stretchable core-sheath type composite yarn according to any one of claims 1 to 4, which is a conjugate yarn of a conjugated yarn having a degree of elongation of 25 to 45%, in which terephthalate is compounded side-by-side.   Flame retardant fiber is aramid fiber, polybenzimidazole fiber, polyimide fiber, polyvinyl chloride fiber, polyetherimide fiber, polyarylate fiber, polyparaphenylene benzobisoxazole fiber, noboroite fiber, flame retardant acrylic fiber, polyclarate fiber, difficult The stretchable core-sheath composite yarn according to any one of claims 1 to 5, which is at least one fiber selected from the group consisting of flame retardant polyester fiber, flame retardant cotton fiber, flame retardant wool fiber, and flame retardant rayon fiber.   The stretchable fiber according to any one of claims 1 to 5, wherein the flame-retardant fiber yarn is a meta-aramid fiber having a) a thermal decomposition temperature of 400 ° C or higher and b) a LOI value of 25 or higher according to JIS L1091 E method. Core-sheath type composite yarn.   The stretchable core-sheath composite yarn according to any one of claims 1 to 7, wherein a single fiber denier of the core yarn is 3.0 to 8.0 denier.   A fabric and a textile product comprising the stretchable core-sheath composite yarn according to claim 1.