JP2005023499A - Polyester fiber excellent in light-fastness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester fiber exhibiting less strength decrease even by being exposed with sunlight for a long time and suitably used as an industrial material. <P>SOLUTION: This polyester fiber is obtained by imparting a treating agent containing each 0.2-3 wt. % phenol-based antioxidant, sulfur-based antioxidant and hindered amine-based optical stabilizer on the surface of the polyester fiber. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a polyester fiber excellent in light resistance to which a specific treatment agent is applied. More specifically, the present invention relates to a polyester fiber particularly suitable for industrial materials having excellent light resistance.

  Polyester fibers are used in various fields by taking advantage of their excellent mechanical properties. Particularly in industrial materials, it is widely used for industrial materials such as automobiles because of its high strength and excellent dimensional stability. Among them, for automobile seat belt materials, they are often used because of their outstanding light resistance compared to polyamide fibers.

  However, even when such a polyester fiber is exposed to sunlight for a long period of time, the strength is reduced, and further improvement in light resistance is desired.

  Conventionally, as a method for improving the light resistance of polyester fiber, various methods of adding an antioxidant or an ultraviolet absorber to the polymer have been proposed. There is a problem that decreases. Furthermore, in order to maintain sufficient light resistance, it is necessary to increase the amount thereof, which not only facilitates bleeding of the additive to the fiber surface, but also has a problem in terms of cost.

As a method for solving such a problem, a method for improving the light resistance of the yarn-forming oil agent applied to the surface of the polyester fiber is disclosed. For example, Japanese Patent Application Laid-Open No. 2-175966 discloses a powerful deterioration due to light by providing an oil containing a monoester compound composed of a long-chain aliphatic alcohol having a branched chain and a fatty acid and an ethylene oxide-added nonionic activator. A method for preventing this problem has been proposed. However, the fiber obtained by such a method has a problem in that the strength of the product is greatly reduced because the fiber strength utilization rate decreases when the fiber is made of a high-density fabric. Japanese Patent Application Laid-Open No. 7-102477 proposes a method of applying a spinning oil in which a polyester fiber surface is blended with one or more antioxidants of a phenolic type, a phosphoric acid type, and an amine type and an ultraviolet absorber. Yes. Certainly, according to this method, although light resistance is improved and strong deterioration is suppressed, it is not a sufficient level, and further improvement is desired.
Japanese Patent Laid-Open No. 2-175966 JP-A-7-102477

  The present invention has been made against the background of the above prior art, and an object of the present invention is to provide a polyester fiber suitable as an industrial material that has little decrease in strength even when exposed to sunlight for a long time.

  As a result of intensive studies to achieve the above problems, the present inventor can obtain a polyester fiber with significantly improved light resistance if a treatment agent having both a specific antioxidant and a light stabilizer is added. And reached the present invention.

  Thus, according to the present invention, the fiber surface is provided with a light resistance obtained by adding a treatment agent containing 0.2 to 3% by weight of a phenol-based antioxidant, a sulfur-based antioxidant, and a hindered amine-based light stabilizer, respectively. Excellent polyester fibers are provided.

  The polyester fiber in the present invention is a fiber made of a linear polymer in which a large number of repeating units are arranged through ester bonds. For example, polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, polycyclohexanedimethylene terephthalate, polyethylene-2. , 6-Naphthalenedicarboxylate, and these polyesters are copolymerized with a small amount of a third component such as isophthalic acid, adipic acid, sebacic acid, ethylene glycol, diethylene glycol, neopentyl glycol, bisphenol A, for example, 10 mol% or less. However, the present invention is not limited to these. Of these, polyethylene terephthalate-based polyester fibers obtained by copolymerizing a small amount of polyethylene terephthalate fibers and the third component are preferable.

  As a component of the treatment agent (hereinafter sometimes referred to as an oil agent) applied to the surface of the polyester fiber, a conventionally known oil agent component for polyester fiber can be applied.

  First, as a smoothing agent for reducing the frictional resistance between the yarn and various yarn guides, various ester compounds having a molecular weight of 350 to 700 can be appropriately employed. For example, lauryl oleate, isooctyl stearate, butyl stearate, isotriol. Ester compounds of aliphatic monocarboxylic acids and aliphatic monohydric alcohols such as decyl stearate, oleyl oleate, isoeicosyl isostearate, neopentyl glycol dilaurate, 1,6-hexanediol diolate, trimethylolpropane triheralgo Complete ester compounds of aliphatic monocarboxylic acids and aliphatic polyhydric alcohols such as nates, complete ester compounds of aliphatic polycarboxylic acids and aliphatic monohydric alcohols such as bis (2-ethylhexyl) azelate and dioleyl adipate, etc. Can mention

  Moreover, a nonionic surfactant is usually used as an emulsifier for making the ester compound into an aqueous emulsion. Specific examples include polyalkylene glycol alkyl ethers, polyalkylene glycol aryl ethers, and alkylene oxide adducts of partially ester polyhydric alcohols. Of these, polyalkylene glycol alkyl ether is preferable.

  An anionic surfactant is mainly used to improve antistatic properties. For example, alkyl sulfonate salt, alkyl phosphate salt, polyalkylene glycol alkyl ether phosphate salt, alkyl carboxylate salt, alkyl sulfate salt and the like can be mentioned.

  It is important that the treating agent used in the present invention contains both a phenolic antioxidant and a sulfurous antioxidant in addition to the above treating agent components. The use of these antioxidants alone or the use of other antioxidants, such as the combined use of phosphoric acid-based or amine-based antioxidants, is not preferable because the effect of inhibiting oxidation becomes insufficient. That is, the combined use of a phenolic antioxidant and a sulfurous antioxidant synergistically improves the oxidation inhibition effect.

  The phenolic antioxidant may be any type of monophenolic, bisphenolic, and polymeric phenolic (having three or more phenolic functional groups), but in particular, the polymeric phenolic antioxidant is preferable. Specific examples of the compound include 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane (trade name, ADK STAB AO-30 manufactured by Asahi Denka), 5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene (trade name is ADK STAB AO-330 manufactured by Asahi Denka), 1,3,5-tris (3 ′, 5′di-t-butyl-4-hydroxybenzyl) -S-triazine-2,4,6- (1H, 3H, 5H) trione (trade name, ADK STAB AO-20 manufactured by Asahi Denka) Can be illustrated.

  On the other hand, as the sulfur-based antioxidant, pentaerythritol tetralauryl thiopropionate (trade name: Mark AO-412S manufactured by Adeka Argus Chemical), distearyl 3,3′-thiodipropionate (trade name: Sumitomo Chemical's Sumitizer TPS) can be exemplified.

  It is important that the treating agent used in the present invention contains a hindered amine light stabilizer in addition to the above. By using the light stabilizer in combination, the strong deterioration of the fiber due to light is remarkably suppressed. Examples of the hindered amine light stabilizer preferably used include, as trade names, ADK STAB LA-77, ADK STAB LA-57, ADK STAB LA-67, ADK STAB LA-68, ADK STAB LA-87, and the like manufactured by Asahi Denka. it can. Of these, polymer type ADK STAB LA-57 and ADK STAB LA-67 are preferable.

  The content of the above-mentioned phenolic antioxidant, sulfur-based antioxidant and hindered amine meter light stabilizer in the processing agent is in the range of 0.2 to 3% by weight, particularly in the range of 0.5 to 2% by weight. There must be. If any content is less than 0.2% by weight, the intended effect of the present invention is insufficient. On the other hand, if it exceeds 3% by weight, the smoothness of the treatment agent is deteriorated. It is not preferable because the process stability is lowered in the spinning process and the post-processing process of the obtained fiber. The total content of the phenol-based antioxidant, the sulfur-based antioxidant and the hindered amine light stabilizer is preferably less than 5% by weight. When the total content exceeds 5% by weight, not only the smoothness of the treatment agent is lowered, but also the workability in yarn production and post-processing tends to be lowered.

  In addition to the above-mentioned various components, the treatment agent of the present invention described above includes conventionally used silicones, fluorine compounds, emulsification regulators, antiseptics, etc., as long as the effects of the present invention are not impaired. These ingredients may be blended.

  The polyester fiber of the present invention is provided with the above-mentioned treatment agent, but the method of applying the polyester fiber is not particularly limited, and may be applied by a conventionally known method. For example, it is appropriate to apply to the unstretched polyester fiber as an aqueous emulsion containing 3 to 15% by weight of the treating agent component in the production process of polyester as a spinning oil. At this time, as a method of applying, any method conventionally employed such as an oiling roller method or a method using a nozzle may be used. The applied amount may be the same as the applied amount of the usual spinning oil, and may be 0.2 to 2.0% by weight, preferably 0.3 to 1.5% by weight, based on the fiber weight.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, the physical-property value in an Example was measured with the following method.

(1) Strength retention after light resistance test According to JIS B 7751, fiber strength after irradiation for 100 hours at 83 ° C was measured using an ultraviolet carbon arc lamp light resistance tester, and divided by the strength before irradiation. Was a strong retention rate (%).

[Example]
Polyethylene terephthalate having an intrinsic viscosity [IV] of 0.93 is melted and discharged to form a 120 filament yarn. After solidifying this yarn, the treatment agent emulsion shown in Table 1 is treated with a pure treatment agent through an oiling roller. To give 0.5% by weight with respect to the yarn weight, and further set by drawing heat to obtain a drawn yarn of 1390 dtex / 120f. The drawn yarn obtained was knitted into a cylinder and subjected to an ultraviolet carbon arc lamp type light resistance test to determine the strength retention (%). The results are shown in Table 1.

Adeka Stub AO-30 manufactured by Asahi Denka; phenolic antioxidant [1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane]
Mark AO412S manufactured by Adeka Argus Chemical; sulfur antioxidant (pentaerythritol tetralauryl thiopropionate)
・ Adekastab TPP manufactured by Asahi Denka; Phosphorus antioxidant (triphenyl phosphite)
・ Adeka Stub LA-57 manufactured by Asahi Denka; light stabilizer [2,2,6,6-tetramethyl-4-piperidyl ester of 1,2,3,4-butanetetracarboxylic acid]
Adeka Stub LA-32 manufactured by Asahi Denka; UV absorber [2- (2-hydroxy-5-methylphenyl) benzotriazole]

  The polyester fiber of the present invention described above has a light resistance because a treatment agent having a specific amount of a phenolic antioxidant, a sulfurous antioxidant and a hindered amine light stabilizer is attached to the fiber surface. Remarkably improved, its strength retention is good even when exposed to light for a long time. Therefore, it can be used suitably for an industrial material requiring light resistance, for example, for a seat belt or a building material.

Claims (3)

  A polyester fiber excellent in light resistance, wherein a treatment agent containing 0.2 to 3% by weight of a phenol-based antioxidant, a sulfur-based antioxidant and a hindered amine-based light stabilizer is provided on the fiber surface.   The polyester fiber excellent in light resistance according to claim 1, wherein the phenolic antioxidant is a polymer type phenolic antioxidant.   The polyester fiber excellent in light resistance according to claim 1, wherein the content of the phenolic antioxidant, the sulfur antioxidant and the hindered amine light stabilizer in the total treating agent is 5% by weight or less.