Dilute solution of treating agent for synthetic fibers and method for manufacturing synthetic fibers

Abstract

The diluent of the treating agent for synthetic fibers of the present invention contains a treating agent for synthetic fibers and a volatile diluent. The treating agent for synthetic fibers contains a smoothing agent, a nonionic surfactant, and an antistatic agent. When the total content ratio of the treating agent for synthetic fibers and the volatile diluent in the diluent is set to 100% by mass, the treating agent for synthetic fibers is 60% by mass or more and less than 100% by mass, and the volatile diluent is more than 0% by mass and 40% by mass or less. The dynamic viscosity of the diluent at 30 °C is more than 0 mm 2 / s and less than 80 mm 2 / s. The diluent is applied to a predetermined spinning and drawing process using a spinning and drawing machine, and the spinning and drawing machine is equipped with a plurality of heating rollers for drawing the spun yarn.

Description

Technical Field

[0001] The present invention relates to a diluent for a treating agent for synthetic fibers and a method for manufacturing synthetic fibers, which can sufficiently prevent oil drops in a spinning and stretching method with a small number of windings of a thread on a heating roll, have good spinnability, and can improve the thread quality and dyeability of the obtained thread. Background Art

[0002] Generally, from the viewpoint of improving productivity, synthetic fibers such as polyester are produced by a direct spinning and stretching method in which filaments obtained by melt spinning are immediately stretched and then wound. In this direct spinning and stretching method, an aqueous oil agent (a diluent for a treating agent for synthetic fibers) for imparting functions such as smoothness is attached to the surface of the melt-spun thread, and a spinning and stretching machine that stretches through a plurality of rolls such as heating rolls is used.

[0003] In Patent Document 1, the spun thread is stretched by two heating rolls. Separation rolls are provided on each heating roll, and the thread is wound around multiple times between the heating roll and the separation roll. After the thread is heated to a temperature above the glass transition temperature by the upstream heating roll, it is stretched between the two heating rolls.

[0004] In Patent Document 2, the thread is wound and stretched in a single-hung state with winding angles on a plurality of heating rolls each less than 360 degrees. At this time, as a diluent for a treating agent for synthetic fibers, a treating agent in the diluent is applied to the stretched thread at a concentration of 40 to 60% by mass and a dynamic viscosity at 30 ° C of 100 to 200 mm 2 / s.

[0005] Patent Document 1: Japanese Patent Laid-Open No. 6-17312

[0006] Patent Document 2: Japanese Patent Laid-Open No. 2014-70294 Summary of the Invention

[0007] In Patent Document 1, a diluent for a treating agent for synthetic fibers with a high water content, that is, a diluent for a treating agent for synthetic fibers with a low concentration of the treating agent for synthetic fibers, is used in the spinning process of synthetic fibers. Therefore, when the thread is heated to a predetermined temperature by a heating roll, a lot of heat is consumed to evaporate the water in the diluent, so the thermal efficiency is poor. As a result, spots in the thermal history during thread stretching are likely to occur, and there are problems with the dyeability of the thread. In addition, when the contact length of the thread with the heating roll is extended, heat is sufficiently transferred to the thread, and the problem of dyeability caused by spots in the thermal history is improved. However, there are the following problems: it is necessary to wind the thread around one heating roll multiple times, it is necessary to extend the heating roll in the axial direction, and the workability of winding the thread also deteriorates.

[0008] The diluent of the treating agent for synthetic fibers used in Patent Document 2 has the problem that sufficient dyeability of the yarn cannot be obtained as in Patent Document 1 because the thermal efficiency when heating the yarn is not high. Therefore, in order to increase the contact length of the yarn with the heating roller, it is necessary to increase the heating roller or increase the outer shape of the heating roller. On the other hand, when the treating agent for synthetic fibers in the diluent is used at a higher concentration, the dynamic viscosity becomes higher, so there are problems such as the generation of oil droplets and the deterioration of the yarn quality.

[0009] The problem to be solved by the present invention is to provide a diluent of a treating agent for synthetic fibers and a method for manufacturing synthetic fibers using the diluent, which can sufficiently prevent oil droplets, have good spinnability, and improve the yarn quality and dyeability of the obtained yarn in a spinning and drawing method in which the number of winding turns of the yarn on the heating roller is small.

[0010] The inventors of the present invention have studied to solve the above problems, and as a result, it has been found that for a diluent of a treating agent for synthetic fibers used in a spinning and drawing process using a spinning and drawing machine having a plurality of heating rollers and the number of winding turns of the yarn on each heating roller is more than 0 turns and 3 turns or less, the diluent contains the treating agent for synthetic fibers in a specific proportion range and the diluent of the treating agent for synthetic fibers has a specific viscosity range, which is just suitable.

[0011] That is, one aspect of the present invention is a diluent of a treating agent for synthetic fibers, which contains a treating agent for synthetic fibers and a volatile diluent. The treating agent for synthetic fibers contains a smoothing agent, a nonionic surfactant, and an antistatic agent. The characteristic is that when the total content ratio of the treating agent for synthetic fibers and the volatile diluent in the diluent is set to 100% by mass, the treating agent for synthetic fibers is 60% by mass or more and less than 100% by mass, the volatile diluent is more than 0% by mass and 40% by mass or less, the dynamic viscosity of the diluent at 30 °C is more than 0 mm 2 / s and less than 80 mm 2 / s, the diluent is applied to a spinning and drawing process using a spinning and drawing machine. The spinning and drawing machine has a plurality of heating rollers for stretching the spun yarn, and the number of winding turns of the yarn on each heating roller in the spinning and drawing process is more than 0 turns and 3 turns or less.

[0012] Preferably, the dynamic viscosity of the non-volatile components in the diluent at 30 °C is 10 to 70 mm 2 / s.

[0013] Preferably, the dynamic viscosity of the diluent at 30 °C is 10 to 70 mm 2 / s.

[0014] Preferably, the dynamic viscosity of the diluent at 30 °C is 20 to 65 mm2 / s.

[0015] Preferably, when the total content ratio of the treating agent for synthetic fibers and the volatile diluent in the diluent is 100% by mass, the content of the treating agent for synthetic fibers is 65 to 98% by mass, and the content of the volatile diluent is 2 to 35% by mass.

[0016] Preferably, the content of the treating agent for synthetic fibers is 70 to 95% by mass, and the content of the volatile diluent is 5 to 30% by mass.

[0017] Preferably, the content of the treating agent for synthetic fibers is 75 to 92% by mass, and the content of the volatile diluent is 8 to 25% by mass.

[0018] Preferably, the volatile diluent contains water.

[0019] Preferably, the smoothing agent contains a fatty acid ester having a total carbon number of 24 to 32 in the molecule.

[0020] Preferably, the antistatic agent contains at least one compound selected from fatty acid salts, organic phosphates, organic sulfonates, amphoteric compounds, and quaternary ammonium salts.

[0021] Preferably, when the total content ratio of the smoothing agent, nonionic surfactant, and antistatic agent in the treating agent for synthetic fibers is 100% by mass, the diluent contains 30 to 80% by mass of the smoothing agent, 5 to 70% by mass of the nonionic surfactant, and 1 to 20% by mass of the antistatic agent.

[0022] Further, a method for manufacturing synthetic fibers according to another aspect of the present invention is characterized by including: a step of attaching a diluent of a treating agent for synthetic fibers to a synthetic fiber yarn at a ratio of 0.1 to 20% by mass of the treating agent for synthetic fibers; and a spinning and drawing step, which is performed using a spinning and drawing machine having a plurality of heating rollers for stretching a spun yarn, and the number of windings of the yarn around each heating roller is greater than 0 turns and 3 turns or less.

[0023] Advantages of the Invention

[0024] The present invention can sufficiently prevent oil droplets, has good spinnability, and can improve the yarn quality and dyeability of the obtained yarn. Embodiment

[0025] (First Embodiment)

[0026] First, a description will be given of a first embodiment in which a dilution of the treating agent for synthetic fibers of the present invention (hereinafter also simply referred to as a dilution) is embodied. The dilution of this embodiment contains a treating agent for synthetic fibers and a volatile diluent. The treating agent for synthetic fibers contains a smoothing agent, a nonionic surfactant, and an antistatic agent. If the total content ratio of the treating agent for synthetic fibers and the volatile diluent in the dilution is 100% by mass, then the content of the treating agent for synthetic fibers is 60% by mass or more and less than 100% by mass, and the content of the volatile diluent is more than 0% by mass and 40% by mass or less. Further, the dilution of this embodiment is characterized in that its dynamic viscosity at 30°C is greater than 0 mm 2 / s and less than 80 mm 2 / s, and it is applicable to a spinning and drawing process using a spinning and drawing machine and a spinning and drawing method in which the number of windings of the yarn around each heating roll is more than 0 turns and 3 turns or less. The spinning and drawing machine is equipped with a plurality of heating rolls for stretching the spun yarn.

[0027] The treating agent for synthetic fibers used in the dilution of this embodiment is as described above and contains a smoothing agent, a nonionic surfactant, and an antistatic agent.

[0028] The smoothing agent used as the treating agent for synthetic fibers in the diluent of the present embodiment is not particularly limited. For example, it may include (1) ester compounds of aliphatic monohydric alcohols and aliphatic monocarboxylic acids such as butyl stearate, octyl stearate, oleyl laurate, oleyl oleate, isopentacosanyl isostearate, octyl palmitate, octyl laurate, isotridecyl stearate, dodecyl laurate, dodecyl oleate, dodecyl stearate; (2) ester compounds of aliphatic polyhydric alcohols and aliphatic monocarboxylic acids such as 1,6 - hexanediol dicaprate, glyceryl trioleate, trimethylolpropane trioleate, trimethylolpropane trilaurate; (3) ester compounds of aliphatic monohydric alcohols and aliphatic polycarboxylic acids such as dioctyl adipate, dilauryl adipate, diolyl azelate, diisocetyl thiodipropionate; (4) ester compounds of aromatic monohydric alcohols and aliphatic monocarboxylic acids such as benzyl oleate, benzyl laurate; (5) ester compounds of aromatic polyhydric alcohols and aliphatic monocarboxylic acids such as bisphenol A dilaurate, bisphenol A dioleate; (6) ester compounds of aliphatic monohydric alcohols and aromatic polycarboxylic acids such as bis(2 - ethylhexyl) phthalate, diisostearyl isophthalate, trioctyl trimellitate; (7) natural oils such as coconut oil, rapeseed oil, sunflower oil, soybean oil, castor oil, sesame oil, fish oil, beef tallow; (8) mineral oil; and other well - known smoothing agents used in treating agents for synthetic fibers. These smoothing agents can be used alone, or two or more of them can be mixed. Among these, from the perspective of better effects on the present invention, a smoothing agent containing fatty acid esters with a total carbon number of 24 - 32 in the molecule such as octyl stearate, oleyl laurate, octyl palmitate, isotridecyl stearate, dodecyl laurate, dodecyl oleate, dodecyl stearate, 1,6 - hexanediol dicaprate, dilauryl adipate, benzyl oleate is preferably used.

[0029] The nonionic surfactant used as the treating agent for synthetic fibers in the diluent for the present embodiment is not particularly limited. For example, (1) polyoxyethylene laurate, polyoxyethylene oleate, polyoxyethylene methyl ether laurate, polyoxyethylene octyl ether laurate, dipolyoxyethylene lauryl ether adipate, polyoxyethylene dilaurate, polyoxyethylene dioleate, polyoxyethylene octyl ether, polyoxyethylene lauryl ether, polyoxyethylene isotridecyl ether, polyoxyethylene oleyl ether, polyoxypropylene lauryl ether, polyoxybutylene oleyl ether, polyoxyethylene polyoxypropylene butyl ether, polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene nonylphenyl ether, laurylamine polyoxyethylene ether, polyoxyethylene laurylamide ether, diethylene glycol, triethylene glycol, ethylene glycol monobutyl ether, etc., compounds obtained by adding alkylene oxides having 2 to 4 carbon atoms such as ethylene oxide, propylene oxide, 1,2-epoxybutane, and 1,4-epoxybutane to at least one molecule selected from organic acids, organic alcohols, organic amines, and organic amides; (2) polyol partial ether type nonionic surfactants such as sorbitan monooleate and sorbitan trioleate; (3) polyoxyalkylene polyol fatty acid ester type nonionic surfactants such as polyoxyethylene sorbitan trioleate, polyoxyethylene castor oil ether, polyoxyethylene polyoxypropylene hydrogenated castor oil ether, polyoxyethylene hydrogenated castor oil ether dioleate, and polyoxyethylene hydrogenated castor oil ether trilaurate; (4) fatty acid amide type nonionic surfactants such as lauric acid diethanolamine and oleic acid diethanolamine; (5) polyoxyalkylene fatty acid amide type nonionic surfactants such as polyoxyethylene oleic acid diethanolamine; (6) higher fatty acids such as lauric acid, oleic acid, and stearic acid; (7) higher alcohols such as lauryl alcohol, oleyl alcohol, and stearyl alcohol. These nonionic surfactants can be used alone or in combination of two or more.

[0030] The antistatic agent used as the treating agent for synthetic fibers in the diluent for the present embodiment is not particularly limited. For example, (1) fatty acid salts such as potassium acetate, potassium octanoate, and potassium oleate; (2) organic sulfonates such as potassium decanesulfonate, sodium alkyl (C12-C15) sulfonate, and sodium tetradecanesulfonate; (3) organic sulfates such as sodium lauryl sulfate; (4) organic phosphates such as potassium lauryl phosphate, potassium oleyl phosphate, the salt of polyoxyethylene oleyl phosphate and polyoxyethylene laurylamine ether, and potassium polyoxyethylene polyoxypropylene lauryl phosphate; (5) amphoteric compounds such as octyldimethylammonium acetate, N,N-bis(2-carboxyethyl)-octylamine sodium, and N-oleyl-N'-carboxyethyl-N'-hydroxyethyl-ethylenediamine sodium; (6) quaternary ammonium salts such as dimethyloctylammonium trimethyl phosphate and dimethyldodecylammonium trimethyl phosphate. These antistatic agents can be used alone or in combination of two or more. Among these, from the viewpoint of better effects on the present invention, an antistatic agent containing at least one compound selected from fatty acid salts, organic phosphates, organic sulfonates, amphoteric compounds, and quaternary ammonium salts is preferred.

[0031] For the treating agent for synthetic fibers in the diluent of the present embodiment, when the total content ratio of the above-mentioned smoothing agent, nonionic surfactant, and antistatic agent is set to 100% by mass, it preferably contains 30 to 80% by mass of the smoothing agent, 5 to 70% by mass of the nonionic surfactant, and 1 to 20% by mass of the antistatic agent. By specifying within the above ranges, the effects of the present invention can be further enhanced.

[0032] The volatile diluent for the diluent of the present embodiment is not particularly limited. For example, water, organic solvents, low-viscosity mineral oils, etc. can be cited. Specific examples of the organic solvent include hexane, ethanol, isopropanol, ethylene glycol, propylene glycol, diethyl ether, toluene, xylene, dimethylformamide, methyl ethyl ketone, chloroform, etc. Specific examples of the low-viscosity mineral oil include mineral oils having a dynamic viscosity at 30°C of 5 mm 2 / s or less. More specifically, paraffins having 11 to 13 carbon atoms (for example, trade name: N-paraffin No. 1408, manufactured by Sasol, etc.), paraffins having 12 carbon atoms (for example, trade name: Cactus normal paraffin N-12D, manufactured by Japan Energy, etc.), paraffins having 13 to 15 carbon atoms (for example, trade name: Cactus normal paraffin YHNP, manufactured by Japan Energy, etc.), paraffins having 14 carbon atoms (for example, trade name: Cactus normal paraffin N-14, manufactured by Japan Energy, etc.), etc. can be cited. These volatile diluents can be used alone or two or more of them can be mixed within the range of compatibility. Among these, from the viewpoint of better effects on the present invention, the volatile diluent is preferably one containing water.

[0033] For the diluent of the present embodiment, when the total content ratio of the above-mentioned treating agent for synthetic fibers and the volatile diluent is 100% by mass, it contains 60% by mass or more and less than 100% by mass of the treating agent for synthetic fibers, and the volatile diluent is more than 0% by mass and 40% by mass or less. The above content ratio is preferably 65 to 98% by mass of the treating agent for synthetic fibers and 2 to 35% by mass of the volatile diluent, more preferably 70 to 95% by mass of the treating agent for synthetic fibers and 5 to 30% by mass of the volatile diluent, and most preferably 75 to 92% by mass of the treating agent for synthetic fibers and 8 to 25% by mass of the volatile diluent. By specifying within the above ranges, the effects of the present invention, particularly the spinnability, yarn quality, and dyeability, can be further enhanced.

[0034] The diluent of the present embodiment has a dynamic viscosity at 30°C greater than 0 mm 2 / s and less than 80 mm 2 / s. Preferably 10 to 70 mm 2 / s, more preferably 20 to 65 mm 2 / s. By specifying within the above range, the effects of the present invention can be further enhanced. In addition, the dynamic viscosity is measured using a Cannon-Fenske viscometer (the same applies hereinafter).

[0035] The dynamic viscosity of the non-volatile component in the diluent of the present embodiment is not particularly limited, and is preferably 10 to 70 mm 2 / s at 30°C. By specifying within the above range, the effects of the present invention, particularly the oil droplet suppression effect, linear mass, and dyeability, can be further enhanced.

[0036] In addition, the non-volatile component refers to the absolute dry matter obtained by heat-treating the diluent of the present embodiment at 105°C for 2 hours to sufficiently remove the volatile diluent.

[0037] Other components can be used in combination in the diluent of the present embodiment according to the purpose, such as antifoaming agents (silicon-based compounds, mineral oils, etc.), antioxidants, preservatives, rust inhibitors, etc. The combined amount of other components can be specified within the range that does not impair the effects of the present invention, but it is preferably as small as possible.

[0038] The diluent of the present embodiment is applied to a spinning and drawing method using a spinning and drawing machine equipped with a plurality of heating rollers for stretching the spun yarn, and the number of windings of the yarn on each heating roller is greater than 0 turns and 3 turns or less.

[0039] The yarn suspended on the spinning and drawing machine is stretched by a plurality of rollers including two or more heating rollers. At this time, the stretched yarn is wound around each roller with a winding number greater than 0 turns and 3 turns or less. The so-called winding number greater than 0 turns and 3 turns or less, in the case of using a separating roller in combination, includes the state of winding the yarn 1 turn, 2 turns, or 3 turns between the heating roller and the separating roller. In addition, when the winding number is greater than 0 turns and less than 1 turn, it includes the state of simply hanging the yarn on the heating roller. In the above configuration, the winding workability is high. On the other hand, compared with the yarn wound more than 3 turns, the heating length during stretching is shorter.

[0040] In the present embodiment, for the yarn wound around the heating roller with a winding number greater than 0 turns and 3 turns or less, the diluent of the treating agent for synthetic fibers is supplied in a high-concentration state. Therefore, the heat consumed by the evaporation of the volatile diluent is small, and even if the heating length is short, the yarn can be sufficiently heated, and a yarn with excellent quality can be obtained. In addition, the viscosity of the diluent of the present embodiment is appropriately maintained low, thereby preventing oil droplets during liquid supply.

[0041] (Second Embodiment)

[0042] A second embodiment for embodying the method for manufacturing the synthetic fiber of the present invention (hereinafter referred to as the manufacturing method) will be described. The manufacturing method of this embodiment includes a step of attaching a dilution liquid of the treatment agent for synthetic fibers of the first embodiment to the yarn of the synthetic fiber at a ratio of 0.1 to 20% by mass of the treatment agent for synthetic fibers. In addition, it includes a spinning and drawing step using a spinning and drawing machine. The spinning and drawing machine has a plurality of heating rollers for stretching the spun yarn, and the number of windings of the yarn on each heating roller in the spinning and drawing step is greater than 0 turns and 3 turns or less.

[0043] The synthetic fiber for attaching the dilution liquid of this embodiment is not particularly limited. For example, (1) polyester fibers such as polyethylene terephthalate, polytrimethylene terephthalate, and polylactate, (2) polyamide fibers such as nylon 6 and nylon 66, (3) polyacrylic resin fibers such as polyacrylic resin and modified acrylic (Modacrylic), (4) polyolefin fibers such as polyethylene and polypropylene, and polyurethane fibers, etc. Among these, it is preferably applied to polyester fibers or polyamide fibers. In the above cases, the performance of the effects of the present invention can be further improved.

[0044] As a method for attaching the treatment agent of this embodiment, known methods can be used. For example, a roll feeding method, a guiding feeding method using a metering pump, an immersion feeding method, a spray feeding method, etc. Among these, the guiding feeding method is preferably applied. When the above feeding methods are used, the performance of the effects of the present invention can be further improved.

[0045] According to the dilution liquid and the manufacturing method of the above embodiment, the following effects can be obtained.

[0046] (1) In the above embodiment, in the dilution liquid containing a treatment agent for synthetic fibers containing a smoothing agent, a nonionic surfactant, and an antistatic agent, and a volatile diluent, the content of the treatment agent for synthetic fibers is set to 60% by mass or more and less than 100%, and the content of the volatile diluent is greater than 0% and 40% or less. In addition, the dynamic viscosity of the dilution liquid at 30 °C is set to be greater than 0 mm 2 / s and less than 80 mm 2 / s. Therefore, the viscosity of the dilution liquid containing the treatment agent for synthetic fibers at a high concentration can be appropriately maintained, oil droplets in the spinning process can be sufficiently prevented, the spinnability is good, and the yarn quality and dyeability of the obtained yarn can be improved.

[0047] (2) The dilution liquid of the above embodiment is applied to the yarn suspended on the spinning and drawing machine, and the yarn is stretched by a plurality of rollers including two or more heating rollers. Since the stretched yarn is wound around each roller with a winding number of greater than 0 turns and 3 turns or less, the winding workability can be improved.

[0048] (3) The diluent of the above-described embodiment is applied to a stretched thread and wound around each roller with a winding number greater than 0 turns and not more than 3 turns in a spinning and stretching method. Compared with a thread wound more than 3 turns, the heating length during stretching is shorter in this spinning and stretching method. Since the diluent of this embodiment is supplied in a state of containing a treating agent for synthetic fibers at a high concentration, the heat consumed by the evaporation of the volatile diluent is small. Even with a short heating length, the thread can be sufficiently heated, and a thread with excellent quality can be obtained.

[0049] In addition, the above-described embodiment can be modified as follows.

[0050] In this embodiment, the number of heating rollers of the spinning and stretching machine is not particularly limited as long as it is 2 or more, and can be appropriately set according to the type, use, purpose, etc. of the thread. Other configurations can appropriately adopt the configurations of known stretching machines.

[0051] Hereinafter, in order to make the configuration and effects of the present invention more specific, examples etc. are listed, but the present invention is not limited to these examples. In addition, in the following examples and comparative examples, % refers to mass %.

[0052] Test Category 1 (Preparation of Diluent of Treating Agent for Synthetic Fibers)

[0053] Example 1

[0054] Using 40% of dodecyl oleate (L-1), 12% of octyl palmitate (L-2), and 15% of a mineral oil (L-4) with a dynamic viscosity of 47 mm 2 / s at 30°C as a smoothing agent, 4% of polyoxyethylene (4 moles of ethylene oxide added, the same hereinafter) oleyl ether (N-4), 3% of polyoxyethylene (4 moles) isoisotridecyl ether (N-5), 3% of polyoxyethylene (5 moles) lauryl ether (N-6), 6% of polyoxyethylene (3 moles) monooleate (N-7), 5% of polyoxyethylene (25 moles) hydrogenated castor oil ether trilaurate (N-12), and 2% of oleic acid (N-17) as nonionic surfactants, and 4% of sodium alkyl (C12-C15) sulfonate (An-1) and 6% of the salt of polyoxyethylene (4 moles) oleyl phosphate and polyoxyethylene (4 moles) laurylamine ether as antistatic agents, with a total of 100%, a diluent of a treating agent for synthetic fibers of Example 1 was prepared by uniformly mixing 90% of such a treating agent for synthetic fibers (P-1) and 10% of water (D-1) as a volatile diluent.

[0055] Examples 2 to 8 and Comparative Examples 1 to 6

[0056] In the same manner as the diluent of the treating agent for synthetic fibers of Example 1, diluents of the treating agents for synthetic fibers of Examples 2 to 8 and Comparative Examples 1 to 6 were prepared. For the diluents of the treating agents for synthetic fibers of each of the above-prepared examples, the types of the respective components of the smoothing agent, nonionic surfactant, and antistatic agent in the treating agent for synthetic fibers and the ratios of the respective components when the total content ratio of the respective components is 100% are shown in Table 1.

[0057] In addition, the types of the volatile diluent and the ratios of the respective agents when the total content ratio of the treating agent for synthetic fibers and the volatile diluent in the diluent is 100% are shown in Table 2.

[0058] Table 1

[0059]

[0060] In Table 1, the meanings of the respective symbols are as follows.

[0061] L-1: Dodecyl oleate,

[0062] L-2: Octyl palmitate,

[0063] L-3: Dodecyl laurate,

[0064] L-4: Mineral oil (dynamic viscosity at 30°C: 47 mm 2 / s),

[0065] RL-1: Trimethylolpropane trilaurate,

[0066] N-1: Polyoxyethylene (3 moles) polyoxypropylene (3 moles) lauryl ether,

[0067] N-2: Polyoxyethylene (4 moles) polyoxypropylene (7 moles) butyl ether,

[0068] N-3: Polyoxypropylene (6 moles) lauryl ether,

[0069] N-4: Polyoxyethylene (4 moles) oleyl ether,

[0070] N-5: Polyoxyethylene (4 moles) isotridecyl ether,

[0071] N-6: Polyoxyethylene (5 moles) lauryl ether,

[0072] N-7: Polyoxyethylene (3 moles) monooleate,

[0073] N-8: Polyoxyethylene (7 moles) octyl laurate,

[0074] N-9: Polyoxyethylene (9 moles) dilaurate,

[0075] N-10: Polyoxyethylene (9 moles) dioleate,

[0076] N-11: Polyoxyethylene (20 moles) hydrogenated castor oil ether dioleate,

[0077] N-12: Polyoxyethylene (25 moles) hydrogenated castor oil ether trilaurate,

[0078] N-13: Sorbitan monooleate,

[0079] N-14: Diethylene glycol,

[0080] N-15: Ethylene glycol monobutyl ether,

[0081] N-16: Diethanolamine oleate,

[0082] N-17: Oleic acid,

[0083] An-1: Sodium alkyl (carbon number 12 - 15) sulfonate,

[0084] An-2: Salt of polyoxyethylene (4 moles) oleyl phosphate and polyoxyethylene (4 moles) laurylamine ether,

[0085] An-3: Potassium salt of polyoxyethylene (6 moles) polyoxypropylene (2 moles) lauryl phosphate,

[0086] An-4: Sodium N-oleoyl-N'-carboxyethyl-N'-hydroxyethyl-ethylenediamine,

[0087] An-5: Potassium octanoate,

[0088] An-6: Potassium acetate.

[0089] Table 2

[0090]

[0091] In Table 2, the meanings of each label are as follows.

[0092] D-1: Water

[0093] D-2: Paraffin with carbon number 11 - 13 (trade name: N-paraffin No. 1408, manufactured by Sasol)

[0094] Test category 2 (Measurement of dynamic viscosity of diluent of treatment agent for synthetic fibers and its non-volatile components)

[0095] · Example 1

[0096] The dynamic viscosity at 30 °C of the diluent of the treatment agent for synthetic fibers (P-1) prepared in Test category 1 was measured by the Cannon-Fenske method and was 62 mm 2 / s. In addition, the dynamic viscosity at 30°C of the non-volatile component obtained by heat-treating a diluted solution of the treating agent (P-1) for synthetic fibers at 105°C for 2 hours by the Cannon-Fenske method to remove the volatile diluent was 48 mm 2 / s.

[0097] · Examples 2 to 8 and Comparative Examples 1 to 6

[0098] In the same manner as the diluted solution of the treating agent for synthetic fibers in Example 1, the dynamic viscosities at 30°C of the diluted solutions of the treating agents for synthetic fibers in Examples 2 to 8 and Comparative Examples 1 to 6 and the non-volatile components of these diluted solutions were measured, and the results are summarized in Table 2.

[0099] Test Category 3 (Manufacture and Evaluation of Synthetic Fibers Obtained by Supplying a Diluted Solution of a Treating Agent for Synthetic Fibers)

[0100] · Example 1

[0101] After drying a sheet of polyethylene terephthalate having an inherent viscosity of 0.64 and a titanium oxide content of 0.2% by a conventional method, spinning was carried out at 295°C using an extruder, and the extruded material was discharged from the nozzle and cooled and solidified. Then, by the guide liquid supply method using a metering pump, a diluted solution of the treating agent (P-1) for synthetic fibers prepared in Test Category 1 was attached to the traveling filament at a rate of 1.0% with respect to the traveling filament. Then, the filaments were bundled by guiding and wound around a first roller heated to 90°C three times and received at a speed of 1400 m / min. Next, the filaments were wound around a second roller heated to 130°C rotating at a speed of 4800 m / min three times and stretched 3.4 times between the first roller and the second roller to produce a polyester fiber of 83.3 decitex (75 denier) and 36 filaments. The amount of the treating agent for synthetic fibers attached, the oil droplets on the liquid supply guide, the spinnability, the linear mass, and the dyeability were measured and evaluated by the following methods. The results are shown in Table 2.

[0102] · Measurement of the Amount of the Treating Agent for Synthetic Fibers Attached

[0103] Weigh 2 g of the polyester fiber produced as described above, extract it with 10 ml of a mixed solution of n-hexane / ethanol = 7 / 3 (volume ratio), dry it on an aluminum tray weighing the extract at 100°C for 5 minutes, and then measure the mass. The amount of the treating agent for synthetic fibers attached to the synthetic fiber was calculated by the following formula 1.

[0104] Formula 1

[0105]

[0106] In Formula 1,

[0107] A: The weight of the aluminum tray,

[0108] B: The weight of the aluminum tray containing the treatment agent for synthetic fibers to be extracted,

[0109] S: The weight of the fibers used for extraction.

[0110] · Evaluation of oil droplets

[0111] Visually observe the dripping phenomenon of the dilution of the treatment agent for synthetic fibers from the liquid supply guide, measure the dripping times of the dilution 5 times per minute, and evaluate its average value according to the following criteria. In addition, round off the decimal part of the average value.

[0112] ◎: The dripping times are 0 times.

[0113] ○: The dripping times are 1 time.

[0114] ×: The dripping times are 2 times or more.

[0115] · Evaluation of spinnability

[0116] Measure the number of thread breaks per 1 ton of thread 10 times when manufacturing polyester fibers, and evaluate its average value according to the following criteria.

[0117] ◎: The number of thread breaks is less than 0.5 times.

[0118] ○: The number of thread breaks is 0.5 times or more and less than 2.0 times.

[0119] ×: The number of thread breaks is 2.0 times or more.

[0120] · Evaluation of thread quality

[0121] Use USTER TESTER UT-5 manufactured by USTER company, at a thread speed of 200 m / minute, to evaluate the Worcester plaques U% of the manufactured polyester fibers. Conduct 5 identical evaluations, and evaluate according to the following criteria from the results of each time.

[0122] ◎: In all 5 times, the Worcester plaques U% are all less than 1.

[0123] ○: In 5 times, there is 1 time when the Worcester plaques U% is 1 or more.

[0124] ×: In 5 times, there are 2 times or more when the Worcester plaques U% is 1 or more.

[0125] · Evaluation of dyeability

[0126] A knitted fabric with a diameter of 70 mm and a length of 1.2 m is made of polyester fiber using a circular knitting machine. The knitted fabric thus produced is dyed by the high-pressure dyeing method using a disperse dye (manufactured by Nippon Kayaku Co., Ltd., trade name Kayalon Polyester Blue T-S). After the dyed knitted fabric is washed, reduction cleaned, and dried in accordance with a usual method (such as Japanese Unexamined Patent Application Publication No. 2015-124443 etc.), it is installed on an iron cylinder with a diameter of 70 mm and a length of 1 m, and the number of deeply dyed portions on the surface of the knitted fabric is counted visually for evaluation. Five identical evaluations are carried out, and the average value of the number of deeply dyed portions counted each time is evaluated according to the following criteria. In addition, the digits after the decimal point of the average value are rounded off.

[0127] ◎: No deeply dyed portions (0 places).

[0128] ○: The number of deeply dyed portions is 1 or 2 places.

[0129] ×: The number of deeply dyed portions is 3 or more places.

[0130] · Examples 2 to 8 and Comparative Examples 1 to 6

[0131] Regarding Examples 2 to 8 and Comparative Examples 1 to 6, polyester fibers are also manufactured in the same manner as in Example 1, and the adhesion amount of the treating agent for synthetic fibers, oil droplets, spinnability, yarn quality, and dyeability are evaluated, and the results are summarized in Table 2.

[0132] From the results in Table 2, it can be seen that according to the present invention, by appropriately maintaining the viscosity of the high-concentration dilution of the treating agent for synthetic fibers, oil droplets can be sufficiently prevented. In addition, in the melt spinning and drawing method in which the number of windings of the yarn on the heating roll is set to be more than 0 turns and 3 turns or less, synthetic fibers with good spinnability, excellent yarn quality, and dyeability can be obtained.

Claims

1. A diluent for a treating agent for synthetic fibers, comprising a treating agent for synthetic fibers and a volatile diluent, wherein the treating agent for synthetic fibers contains a smoothing agent, a nonionic surfactant, and an antistatic agent, characterized in that when the total content ratio of the treating agent for synthetic fibers and the volatile diluent in the diluent is set to 100% by mass, the content of the treating agent for synthetic fibers is 65 to 98% by mass, and the content of the volatile diluent is 2 to 35% by mass, The dynamic viscosity of the dilution liquid at 30°C is greater than 0 mm 2 / s and less than 80 mm 2 / s. The dynamic viscosity of the non-volatile components in the dilution liquid at 30°C is 10 - 70 mm 2 / s the diluent is applied to a spinning and stretching process using a spinning and stretching machine, the spinning and stretching machine is provided with a plurality of heating rollers for stretching the spun yarn, and the number of windings of the yarn on each heating roller in the spinning and stretching process is more than 0 turns and 3 turns or less.

2. The diluent of the treating agent for synthetic fibers according to claim 1, wherein the dynamic viscosity of the diluent at 30 °C is 10 to 70 mm 2 / s.

3. The diluent of the treating agent for synthetic fibers according to claim 1 or 2, wherein the dynamic viscosity of the diluent at 30 °C is 20 to 65 mm 2 / s.

4. The diluent for a treating agent for synthetic fibers according to claim 1 or 2, wherein the content of the treating agent for synthetic fibers is 70 to 95% by mass, and the content of the volatile diluent is 5 to 30% by mass.

5. The diluent for a treating agent for synthetic fibers according to claim 1 or 2, wherein the content of the treating agent for synthetic fibers is 75 to 92% by mass, and the content of the volatile diluent is 8 to 25% by mass.

6. The diluent for a treating agent for synthetic fibers according to claim 1 or 2, wherein the volatile diluent contains water.

7. The diluent for a treating agent for synthetic fibers according to claim 1 or 2, wherein the smoothing agent contains a fatty acid ester having a total carbon number of 24 to 32 in the molecule.

8. The diluent for a treating agent for synthetic fibers according to claim 1 or 2, wherein the antistatic agent contains at least one compound selected from fatty acid salts, organic phosphates, organic sulfonates, amphoteric compounds, and quaternary ammonium salts.

9. The diluent for a treating agent for synthetic fibers according to claim 1 or 2, wherein when the total content ratio of the smoothing agent, the nonionic surfactant, and the antistatic agent in the treating agent for synthetic fibers is set to 100% by mass, the diluent contains 30 to 80% by mass of the smoothing agent, 5 to 70% by mass of the nonionic surfactant, and 1 to 20% by mass of the antistatic agent.

10. A method for manufacturing a synthetic fiber, characterized in that, Comprising: a step of attaching the diluent for a treating agent for synthetic fibers according to any one of claims 1 to 9 to the yarn of synthetic fibers at a ratio of 0.1 to 20% by mass of the treating agent for synthetic fibers; and a spinning and stretching step, which is carried out using a spinning and stretching machine provided with a plurality of heating rollers for stretching the spun yarn, and the number of windings of the yarn on each heating roller is more than 0 turns and 3 turns or less.

Images