TWI701369B - Dilution of synthetic fiber treatment agent and method of producing synthetic fiber - Google Patents

Abstract

The diluent of the synthetic fiber processing agent of the present invention contains a synthetic fiber processing agent containing a smoothing agent, a nonionic surfactant, and an antistatic agent, and a volatile diluent. If the synthetic fiber in the diluent is used The total content of the treatment agent and the volatile diluent is 100% by mass, the synthetic fiber treatment agent 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. Proportion, the dynamic viscosity of the diluted solution at 30℃ is more than 0 mm ² /s and less than 80 mm ² /s. The diluted solution is used in the predetermined spinning extension step using the spinning extension machine. It is provided with a plurality of heating rollers for stretching the spun yarn.

Description

Diluent of treatment agent for synthetic fiber and method for manufacturing synthetic fiber

The present invention relates to the treatment of synthetic fibers that can sufficiently prevent the oil droplets of the spinning drawing method with a small number of windings to the heating roller. The spinnability is good, and the thread quality and dyeability of the obtained thread can be improved. Diluent of agent and manufacturing method of synthetic fiber.

Generally speaking, from the viewpoint of improving productivity, synthetic fibers such as polyester are produced by a direct spinning stretching method in which melt-spun filaments are immediately stretched and then wound. In this direct spinning stretching method, a water-based oil agent (diluted solution of a synthetic fiber processing agent) for imparting smoothness and other functions is attached to the surface of the melt-spun thread, and it is performed by heating rollers and other rollers. Stretching is performed by a spinning stretcher.

In Patent Document 1, the spun yarn is stretched by two heating rollers. Separating rollers are provided on each heating roller, and the wire is wound multiple times between the heating roller and the separating roller. After the thread is heated to a glass transition temperature or higher by the heating roller on the upstream side, it is stretched between the two heating rollers.

In Patent Document 2, the wire is wound and stretched in a single-hanging state in which the winding angle of the plurality of heating rollers is less than 360 degrees. At this time, as a diluent of the treatment agent for synthetic fibers, a treatment agent having a concentration of 40-60% by mass and a dynamic viscosity of 100-200 mm ² /s at 30°C is applied to the stretched thread.

Patent Document 1: Japanese Patent Application Publication No. 6-17312 Patent Document 2: JP 2014-70294 A

Patent Document 1 uses a diluent of a synthetic fiber processing agent with a high water content in the spinning step of synthetic fibers, that is, a diluent of a synthetic fiber processing agent with a low concentration of the synthetic fiber processing agent. Therefore, when the wire is heated to a predetermined temperature by the heating roller, a lot of heat is consumed in order to evaporate the water in the diluent, so the thermal efficiency is poor. This easily causes spots in the thermal history when the thread is stretched, and there is a problem with the dyeability of the thread. In addition, when the contact length of the wire to the heating roller is extended, the heat is sufficiently transmitted to the wire, and the problem of dyeability caused by the spots of the heat history is improved. However, there is a problem that the wire must be wound multiple times on one heating roller, the heating roller needs to be extended in the axial direction, and the workability of winding the wire is also deteriorated.

The diluent of the synthetic fiber processing agent used in Patent Document 2 does not have a high thermal efficiency when heating the thread. Therefore, as in Patent Document 1, there is a problem that sufficient dyeability of the thread cannot be obtained. Therefore, in order to accumulate the contact length of the wire to the heating roller, it is necessary to increase the heating roller or increase the profile of the heating roller. On the other hand, when the synthetic fiber treatment agent in the diluent is used at a higher concentration, the dynamic viscosity becomes higher, so there is a problem that oil droplets are generated, and the yarn quality is also deteriorated.

The problem to be solved by the present invention is to provide a spinning drawing method with a small number of windings of the heating roller thread, which can sufficiently prevent oil droplets, has good spinnability, and can improve the thread obtained A diluent of a treatment agent for synthetic fibers of high quality and dyeability, and a method for producing synthetic fibers using the diluent.

The inventors of the present invention have conducted studies to solve the above-mentioned problems, and found out that it is applied to a spinning stretching step using a spinning stretching machine equipped with a plurality of heating rollers, and the number of windings of each heating roller is The diluent of the synthetic fiber processing agent for spinning and drawing steps exceeding 0 times and 3 times or less contains the synthetic fiber processing agent in a specific ratio range in the diluent, and the diluent of the synthetic fiber processing agent is specific The viscosity range is just right.

That is, one aspect of the present invention is a diluent of a synthetic fiber processing agent, comprising a synthetic fiber processing agent containing a smoothing agent, a nonionic surfactant, and an antistatic agent, and a volatile diluent, which is characterized by If the total content of the synthetic fiber treatment agent and the volatile diluent in the diluent is 100% by mass, the synthetic fiber treatment agent is 60% by mass or more and less than 100% by mass, and the volatile dilution The proportion of the 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 used for spinning stretchers. In the spinning stretching step, the spinning stretching machine is provided with a plurality of heating rollers for stretching the spun yarn, and the number of windings of each heating roller in the spinning stretching step is more than 0 and 3 Times or less.

The dynamic viscosity of the non-volatile part in the diluent is preferably 10 to 70 mm ² /s at 30°C.

The diluent preferably has a dynamic viscosity of 10 to 70 mm ² /s at 30°C.

The diluent preferably has a dynamic viscosity of 20-65 mm ² /s at 30°C.

If the total content of the synthetic fiber treatment agent and the volatile diluent in the diluent is 100% by mass, the diluent preferably contains 65-98% by mass of the synthetic fiber treatment agent and the volatile The ratio of diluent 2 to 35% by mass.

It is preferable to contain the treatment agent for synthetic fibers at a ratio of 70 to 95% by mass and the volatile diluent at a ratio of 5 to 30% by mass.

Preferably, the synthetic fiber processing agent is 75 to 92% by mass and the volatile diluent is contained in a ratio of 8 to 25% by mass.

Preferably the volatile diluent contains water.

Preferably, the smoothing agent contains fatty acid esters with a total carbon number of 24 to 32 in the molecule.

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

Preferably, if the total content of the smoothing agent, nonionic surfactant, and antistatic agent in the synthetic fiber processing agent is 100% by mass, the diluent contains 30 to 80% by mass of the smoothing agent, and the non-ionic surfactant The ratio of the ionic surfactant is 5 to 70% by mass and the antistatic agent is 1 to 20% by mass.

In addition, the method for producing synthetic fibers in another aspect of the present invention is characterized by including: using a diluent of a synthetic fiber processing agent as a synthetic fiber processing agent in a ratio of 0.1 to 20% by mass, The process of attaching a yarn spun synthetic fiber, and using a spinning stretcher equipped with a plurality of heating rollers for stretching the spun yarn, and the number of windings of the yarn of each heating roller It is a spinning stretching step that exceeds 0 times and 3 times or less.

The present invention can sufficiently prevent oil droplets, has good spinnability, and can improve the thread quality and dyeability of the obtained thread.

(First Embodiment) First, the first embodiment in which the diluent of the synthetic fiber processing agent of the present invention (hereinafter also referred to as diluent) is embodied will be described. The diluent of this embodiment contains a synthetic fiber processing agent containing a smoothing agent, a nonionic surfactant, and an antistatic agent, and a volatile diluent. If the total content of the synthetic fiber treatment agent and the volatile diluent in the diluent is 100% by mass, the synthetic fiber treatment agent contains 60% by mass or more and less than 100% by mass, and the volatile diluent exceeds 0 mass% % And 40% by mass or less. In addition, the diluent of the present embodiment is characterized in that its dynamic viscosity at 30°C exceeds 0 mm ² /s and does not reach 80 mm ² /s, and is used in the spinning stretching step using a spinning stretching machine and for each In the spinning drawing method in which the number of windings of the thread of the heating roller exceeds 0 times and 3 times or less, the spinning drawing machine includes a plurality of heating rollers for drawing the spun thread.

The synthetic fiber processing agent provided in the diluent of this embodiment contains a smoothing agent, a nonionic surfactant, and an antistatic agent as mentioned above.

The smoothing agent used in the synthetic fiber treatment agent provided in the diluent of the present embodiment is not particularly limited, and examples thereof include (1) butyl stearate, octyl stearate, oleyl laurate, and oil Oleyl acid, isopentanoic isostearate, octyl palmitate, octyl laurate, istridecyl stearate, dodecyl laurate, dodecyl oleate, dodecyl The ester compound of aliphatic monohydric alcohol and aliphatic monocarboxylic acid such as stearic acid ester, (2) 1,6-hexanediol dicaprate, triolein, trimethylolpropane trioleate, three The ester compound of aliphatic polyol and aliphatic monocarboxylic acid such as hydroxymethyl propane trilaurate, (3) dioctyl adipate, dilauryl adipate, dioleyl azelate, thiodipropionic acid Diisohexadecyl ester and other aliphatic monohydric alcohols and aliphatic polycarboxylic acid ester compounds, (4) benzyl oleate, benzyl laurate and other aromatic monohydric alcohols and aliphatic monocarboxylic acid ester compounds, (5) Ester compounds of aromatic polyols such as bisphenol A dilaurate and bisphenol A dioleate with aliphatic monocarboxylic acids, (6) bis(2-ethylhexyl) phthalate, Esters of aliphatic monohydric alcohols and aromatic polycarboxylic acids such as isophthalic acid diisostearate, trioctyl trimellitate, etc. (7) coconut oil, rapeseed oil, sunflower oil, soybean oil, castor Natural oils such as sesame oil, sesame oil, fish oil, and tallow, (8) known smoothing agents used in synthetic fiber treatment agents such as mineral oil. These smoothing agents may be used alone, or two or more of them may be mixed and used. Among them, from the viewpoint of better effects on the present invention, they preferably contain octyl stearate, oleyl laurate, octyl palmitate, isotridecanyl stearate, dodecyl laurate, Dodecyl oleate, dodecyl stearate, 1,6-hexanediol dicaprate, dilauryl adipate, benzyl oleate and other molecules with a total carbon number of 24 to 32 Smoothing agent for fatty acid esters.

The nonionic surfactant used in the synthetic fiber treatment agent provided in the diluent of this embodiment is not particularly limited, and examples thereof include (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 polyoxyethylene Propylene lauryl ether, polyoxyethylene polyoxypropylene nonylphenyl ether, polyoxyethylene lauric acid amino ether, polyoxyethylene lauryl ether, diethylene glycol, triethylene glycol, ethylene glycol monobutyl ether Etc., adding ethylene oxide, propylene oxide, 1,2-butylene oxide, 1,4-butylene oxide, etc. to at least one molecule selected from organic acids, organic alcohols, organic amines, and organic amides Compounds of alkylene oxides with 2 to 4 carbon elements, (2) sorbitan monooleate, sorbitan trioleate and other polyol partial ether type nonionic surfactants, (3) polyol Oxyethylene sorbitan trioleate, polyoxyethylene castor oil ether, polyoxyethylene polyoxypropylene cured castor oil ether, polyoxyethylene cured castor oil ether dioleate, polyoxyethylene cured castor oil ether trilaurin Fatty acid ester type nonionic surfactants such as polyoxyalkylene polyols such as acid esters, (4) fatty acid amine type nonionic surfactants such as lauric acid diethanolamine and oleic acid diethanolamine, (5) polyoxyethylene oil Diethanolamine and other polyoxyalkylene fatty acid amide type nonionic surfactants, (6) higher fatty acids such as lauric acid, oleic acid, and stearic acid, (7) higher alcohols such as lauryl alcohol, oleyl alcohol, stearyl alcohol, etc. . These nonionic surfactants may be used alone, or two or more of them may be mixed and used.

The antistatic agent used in the synthetic fiber treatment agent provided in the diluent of the present embodiment is not particularly limited, and examples include (1) fatty acid salts such as potassium acetate, potassium octoate, and potassium oleate, and (2) decanoate. Organic sulfonates such as potassium alkanesulfonate, alkyl (12-15 carbon elements) sulfonate sodium salt, sodium tetradecanesulfonate, (3) organic sulfate such as sodium lauryl sulfate, (4) laurel Phosphate potassium salt, oleyl phosphate potassium salt, polyoxyethylene oleyl phosphate and polyoxyethylene lauryl amine ether salt, polyoxyethylene polyoxypropylene lauryl phosphate potassium salt and other organic phosphates, (5 ) Octyldimethylammonium acetate, N,N-bis(2-carboxyethyl)-octylamine sodium, N-oleyl-N'-carboxyethyl-N'-hydroxyethyl-ethylenedi Amphoteric complexes such as sodium amine, (6) dimethyl octyl ammonium trimethyl phosphate, dimethyl dodecyl ammonium trimethyl phosphate and other quaternary ammonium salts. These antistatic agents can be used alone or in combination of two or more. Among these, from the viewpoint that the effect of the present invention is better, an antistatic agent containing at least one compound selected from fatty acid salt, organic phosphate, organic sulfonate, amphoteric complex, and quaternary ammonium salt is preferred .

The synthetic fiber treatment agent provided in the diluent of this embodiment preferably contains a smoothing agent 30 to 30 if the total content of the smoothing agent, nonionic surfactant, and antistatic agent is 100% by mass. 80% by mass, 5 to 70% by mass of nonionic surfactant, and 1 to 20% by mass of antistatic agent. By specifying in the above range, the effect of the present invention can be further improved.

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

If the diluent of this embodiment totals 100% by mass of the synthetic fiber treatment agent and the volatile diluent, it contains 60% by mass or more of the synthetic fiber treatment agent and less than 100% by mass. The ratio of the agent exceeds 0% by mass and 40% by mass or less. The above-mentioned content ratio preferably contains 65 to 98% by mass of synthetic fiber treatment agent and 2 to 35% by mass of volatile diluent, and more preferably contains 70 to 95 mass% of synthetic fiber treatment agent and 5 to 30 by mass of volatile diluent The ratio of mass% is preferably 75-92% by mass of synthetic fiber processing agent and 8-25% by mass of volatile diluent. By setting it in the above range, the effects of the present invention can be further improved, particularly spinnability, thread quality, and dyeability.

The dynamic viscosity of the diluent of this embodiment at 30°C exceeds 0 mm ² /s and does not reach 80 mm ² /s. It is preferably 10 to 70 mm ² /s, more preferably 20 to 65 mm ² /s. By specifying in the above range, the effect of the present invention can be further improved. In addition, the dynamic viscosity was measured using a Cannon-Fenske viscometer (the same applies below).

The dynamic viscosity of the non-volatile part in the diluent of this embodiment is not particularly limited, and is preferably 10 to 70 mm ² /s at 30°C. By setting in the above range, the effects of the present invention can be further improved, especially the oil droplet suppression effect, thread quality, and dyeability.

In addition, the term "non-volatile portion" refers to an absolutely dry product obtained by heat-treating the diluent of this embodiment at 105°C for 2 hours to sufficiently remove the volatile diluent.

In the diluent of this embodiment, other components may be used in combination according to the purpose, such as antifoaming agents (silicon-based compounds, mineral oil, etc.), antioxidants, preservatives, and rust inhibitors. The combined amount of other components can be specified in a range that does not impair the effect of the present invention, but it is preferably as small as possible.

The diluent of this embodiment is applied to the spinning stretching step using a spinning stretching machine. The spinning stretching machine is provided with a plurality of heating rollers for stretching the spun yarn, and each heating roller is The number of windings of the thread is more than 0 times and 3 times or less.

The thread suspended on the spinning stretcher is stretched by a plurality of rollers including two or more heated rollers. At this time, the stretched thread is wound around each roller with a winding number exceeding 0 times and 3 times or less. The number of windings exceeding 0 times and 3 times or less includes a state in which the thread is wound once, twice, or 3 times between the heating roller and the separating roller when the separating roller is used in combination. In addition, when the number of windings exceeds 0 times and does not reach once, it includes the state where the thread is hooked to the heating roller. In the above structure, the workability of winding becomes high, but on the other hand, the heating length at the time of stretching becomes shorter than that of a wire wound more than three times.

In the present embodiment, the diluent of the synthetic fiber processing agent is supplied in a high-concentration state to the thread hung on the heating roller with a winding number exceeding 0 times and 3 times or less. Therefore, the amount of heat consumed by the evaporation of the volatile diluent is small, and the wire can be sufficiently heated even with a short heating length, and a wire of excellent quality can be obtained. In addition, the viscosity of the diluent of the present embodiment is appropriately kept low, thereby preventing oil droplets during liquid supply.

(Second Embodiment) The second embodiment embodying the synthetic fiber manufacturing method of the present invention (hereinafter referred to as the manufacturing method) will be described. The manufacturing method of the present embodiment includes the step of attaching the synthetic fiber threads with the diluted solution of the synthetic fiber processing agent of the first embodiment in a ratio of 0.1 to 20% by mass as the synthetic fiber processing agent . In addition, it includes a spinning stretching step using a spinning stretching machine. The spinning stretching machine is provided with a plurality of heating rollers for stretching the spun yarn. In the spinning stretching step, the winding of each heated roller is The number of windings is more than 0 times and 3 times or less.

The synthetic fiber used for adhering the diluent of the present embodiment is not particularly limited, and examples thereof include (1) poly(ethylene terephthalate), poly(trimethylene terephthalate), and poly(lactate) Ester-based fibers, (2) polyamide-based fibers such as nylon 6, nylon 66, (3) polyacrylic resin-based fibers such as polyacrylic resin and paraacrylonitrile, (4) polyolefin-based fibers such as polyethylene and polypropylene, Polyurethane fiber, etc. These are preferably applied to polyester-based fibers or polyamide-based fibers. In the above case, the performance of the effect of the present invention can be further improved.

As a method of attaching the treatment agent of the present embodiment, a known method can be used, but examples thereof include a roller supply method, a guided liquid supply method using a metering pump, an immersion liquid supply method, and a spray liquid supply method. Among them, the oriented liquid supply method is preferably used. In the case of using the above liquid supply method, the performance of the effect of the present invention can be further improved.

According to the diluent and the production method of the above embodiment, the following effects can be obtained.

(1) In the above embodiment, the synthetic fiber processing agent containing a smoothing agent, a nonionic surfactant, and an antistatic agent and a diluent containing a volatile diluent is assumed to be 60% by mass or more and less than 100% by mass, and the volatile diluent has a ratio of more than 0% by mass and 40% by mass or less. In addition, the dynamic viscosity of the diluent at 30°C is set to exceed 0 mm ² /s and not reach 80 mm ² /s. Therefore, the viscosity of the diluent containing the synthetic fiber treatment agent at a high concentration can be appropriately maintained, oil droplets in the spinning step can be sufficiently prevented, the spinnability is good, and the thread quality and dyeability of the obtained thread can be improved.

(2) The diluent of the above embodiment is applied to a thread suspended on a spinning stretcher, and the thread is stretched by a plurality of rollers including two or more heating rollers. Since the stretched thread is wound on each roller with a winding number exceeding 0 times and 3 times or less, the workability of winding can be improved.

(3) The diluent of the above embodiment is applied to a spinning drawing method in which a stretched thread is wound on each roller with a winding number of more than 0 times and 3 times or less. In this method of spinning and stretching, the heating length during stretching becomes shorter than that of a yarn that is wound more than three times. Since the diluent of this embodiment is supplied in a state where the synthetic fiber processing agent is contained in a high concentration, the heat consumed by the evaporation of the volatile diluent is small, and the thread can be sufficiently heated even with a short heating length. Excellent quality thread.

In addition, the above-mentioned embodiment may be changed as follows.

In this embodiment, the number of heating rollers of the spinning stretcher is not particularly limited as long as it is 2 or more, and it can be appropriately set depending on the type, use, purpose, and the like of the thread. As for the other structure, the structure of a well-known stretcher can be used suitably.

Hereinafter, in order to make the structure and effects of the present invention more specific, although examples are given, the present invention is not limited to these examples. In addition, in the following Examples and Comparative Examples,% means mass %.

Test difference 1 (Preparation of diluent of synthetic fiber treatment agent)

Example 1 Mineral oil (L-4) with 40% lauryl oleate (L-1), 12% octyl palmitate (L-2), and a dynamic viscosity of 47 mm ² /s at 30°C 15% as a smoothing agent, polyoxyethylene (additional moles of ethylene oxide (the same below) 4 moles) oleyl ether (N-4) 4%, polyoxyethylene (4 moles) iso 13 Ether (N-5) 3%, polyoxyethylene (5 mol) lauryl ether (N-6) 3%, polyoxyethylene (3 mol) monooleate (N-7) 6%, polyoxyethylene (25 mol) cured castor oil ether trilaurate (N-12) 5%, oleic acid (N-17) 2% as non-ionic surfactants, alkyl (12-15 carbon elements) sulfonate Sodium salt (An-1) 4%, polyoxyethylene (4 mol) oleyl phosphate and polyoxyethylene (4 mol) lauryl amine ether salt (An-2) 6% are used as antistatic agents, A total of 100% of synthetic fiber treatment agent (P-1) 90%, and water (D-1) as a volatile diluent at a ratio of 10% are uniformly mixed to prepare the dilution of the synthetic fiber treatment agent of Example 1 liquid.

Examples 2 to 8 and Comparative Examples 1 to 6 In the same manner as the dilution liquid of the synthetic fiber treatment agent of Example 1, the dilution liquid of the synthetic fiber treatment agent of Examples 2 to 8 and Comparative Examples 1 to 6 was prepared. Regarding the diluent of the synthetic fiber processing agent of each example prepared above, the smoothing agent, nonionic surfactant, and antistatic agent in the synthetic fiber processing agent are combined with each component type and the content ratio of each component Table 1 shows the ratio of each component when the total is 100%.

In addition, the ratio of each agent when the total content of the type of volatile diluent, the synthetic fiber processing agent in the diluent, and the volatile diluent is 100% is shown in Table 2.

表1

Table 1

In Table 1, each symbol means L-1: Lauryl oleate, L-2: Octyl palmitate, L-3: Lauryl laurate, L-4: Mineral oil (30°C dynamic viscosity: 47 mm ² /s), RL-1: trimethylolpropane trilaurate, N-1: polyoxyethylene (3 mol) polyoxypropylene (3 mol) lauryl ether, N-2: polyoxyethylene (4 mol) polyoxypropylene (7 mol) butyl ether, N-3: polyoxypropylene (6 mol) lauryl ether, N-4: polyoxyethylene (4 mol) oleyl ether, N-5 : Polyoxyethylene (4 mol) isotridecyl ether, N-6: Polyoxyethylene (5 mol) lauryl ether, N-7: Polyoxyethylene (3 mol) monooleate, N-8: Polyoxyethylene (7 mol) octyl ether laurate, N-9: Polyoxyethylene (9 mol) dilaurate, N-10: Polyoxyethylene (9 mol) dioleate, N- 11: Polyoxyethylene (20 mol) cured castor oil ether dioleate, N-12: Polyoxyethylene (25 mol) cured castor oil ether trilaurate, N-13: sorbitan mono-oil Ester, N-14: diethylene glycol, N-15: ethylene glycol monobutyl ether, N-16: oleic acid diethanolamine, N-17: oleic acid, An-1: alkyl (number of carbon elements) 12-15) Sulfonic acid sodium salt, An-2: Polyoxyethylene (4 mol) oil-based phosphate and polyoxyethylene (4 mol) lauryl amine ether salt, An-3: Polyoxyethylene (6 Mole) Polyoxypropylene (2 Mole) Lauryl Phosphate Potassium Salt, An-4: N-oleyl-N'-carboxyethyl-N'- hydroxyethyl-ethylenediamine sodium, An-5 : Potassium caprylate, An-6: Potassium acetate.

表2

Table 2

In Table 2, each mark means D-1: water, D-2: Paraffin wax having 11 to 13 carbon elements (trade name: N-paraffin No. 1408, manufactured by Sasol Corporation).

Test difference 2 (Measurement of the dynamic viscosity of the diluent of the synthetic fiber treatment agent and its non-volatile part)

Example 1 The dynamic viscosity at 30°C of the synthetic fiber treatment agent (P-1) prepared in test distinction 1 was measured by the Cannon-Fenske method, and it was 62 mm ² /s. In addition, if the diluted solution of synthetic fiber treatment agent (P-1) is heat-treated at 105°C for 2 hours by the Cannon-Fenske method, and the volatile diluent is removed, the dynamic viscosity at 30°C of the non-volatile part is measured. It is 48 mm ² /s.

Examples 2 to 8 and Comparative Examples 1 to 6 In the same way as the diluent of the synthetic fiber treatment agent of Example 1, the diluent of the synthetic fiber treatment agent of Examples 2 to 8 and Comparative Examples 1 to 6 and the movement of the non-volatile part of the diluted solution at 30°C were measured. Viscosity, the results are shown in Table 2.

Test difference 3 (manufacturing and evaluation of synthetic fiber obtained by supplying the diluent of the synthetic fiber treatment agent)

Example 1 After drying a polyethylene terephthalate sheet with an inherent viscosity of 0.64 and a titanium oxide content of 0.2% by a normal method, it was spun at 295°C using an extruder, and discharged from the nozzle to cool and solidify. Then, using the guided liquid supply method using a metering pump, the synthetic fiber processing agent (P-1) prepared in test difference 1 was diluted to 1.0% relative to the traveling line as the synthetic fiber processing agent The liquid adheres to the traveling line. Then, the first roller heated to 90°C was wound three times and received at a speed of 1400 m/min. Next, the second roller heated to 130°C rotating at a speed of 4800m/min was wound three times, and stretched 3.4 times between the first roller and the second roller to produce 83.3 decitex. (75 denier) 36 filament polyester fiber. The following methods were used to measure and evaluate the adhesion amount of the synthetic fiber treatment agent during the production of polyester fibers, the oil droplets guided to the liquid supply, spinnability, thread quality, and dyeability. The results are shown in Table 2.

Measurement of adhesion amount of synthetic fiber treatment agent Weigh 2g of the polyester fiber manufactured as above, extract 10ml of a mixed solution of n-hexane/ethanol=7/3 (volume ratio), and dry it on an aluminum tray with the weighed extract at 100°C for 5 minutes. Measure quality. The adhesion amount of the treatment agent for synthetic fibers with respect to the synthetic fibers was determined by the following formula 1.

Equation 1

In formula 1, A: The weight of the aluminum pallet, B: The weight of the aluminum tray containing the extracted synthetic fiber treatment agent, S: The weight of the fiber used for extraction.

Evaluation of oil droplets The dripping phenomenon of the diluted solution from the synthetic fiber treatment agent guided by the liquid supply was visually observed, the number of dripping of the diluted solution per minute was measured 5 times, and the average value was evaluated based on the following criteria. In addition, the average value is rounded to the nearest decimal point. ◎: The number of drops is 0. ○: The number of drops is once. ×: The number of drops is 2 or more times.

Spinnability evaluation The number of thread breakages per ton during the production of polyester fiber was measured 10 times, and the average value was evaluated based on the following criteria. ◎: The number of disconnections is less than 0.5. ○: The number of disconnections is 0.5 times or more and less than 2.0 times. ×: The number of disconnections was 2.0 times or more.

Evaluation of thread quality Using USTER TESTER UT-5 manufactured by USTER, the Worcester plaques U% of the produced polyester fiber was evaluated at a linear speed of 200 m/min. The same evaluation was performed 5 times, and the evaluation was performed based on the following criteria from the results of each time. ⊚: Worcester spot U% did not reach 1 in all 5 times. ○: Worcester spot U% was 1 or more once out of 5 times. X: The Worcester spot U% was 1 or more out of 5 times or more.

Evaluation of dyeability A knitted fabric with a diameter of 70mm and a length of 1.2m is made from the produced polyester fiber by a circular knitting machine. Using disperse dyes (manufactured by Nippon Kayaku Co., Ltd., trade name Kayalon Polyester Blue T-S), the manufactured knitted fabric is dyed by the high-pressure dyeing method. The dyed knitted fabric is washed, reduced and dried according to the usual methods (such as Japanese Patent Application Publication No. 2015-124443, etc.), and then installed in an iron cylinder with a diameter of 70mm and a length of 1m. The number of dark-dyed parts on the surface of the knitted fabric was counted and evaluated. The same evaluation was performed 5 times, and the average of the number of dark-dyed parts counted in each time was evaluated by the following criteria. In addition, the average value is rounded to the nearest decimal point. ◎: No deep stained part (0). ○: 1 or 2 deep dyed parts. ×: There are 3 or more dark dyed parts.

Examples 2 to 8 and Comparative Examples 1 to 6 Regarding Examples 2 to 8 and Comparative Examples 1 to 6, polyester fibers were produced in the same manner as in Example 1, and the adhesion amount, oil droplets, spinnability, thread quality, and dyeability of the synthetic fiber treatment agent were evaluated. All are shown in Table 2.

From the results in Table 2, it is clear that according to the present invention, by appropriately maintaining the viscosity of the high-concentration diluent of the synthetic fiber processing agent, oil droplets can be sufficiently prevented. In addition, in the spinning drawing method in which the number of windings of the thread on the heating roller is more than 0 times and 3 times or less, a synthetic fiber with good spinnability and excellent thread quality and dyeability can be obtained.

Claims (12)

A diluent of a synthetic fiber processing agent, comprising a synthetic fiber processing agent containing a smoothing agent, a nonionic surfactant, and an antistatic agent, and a volatile diluent, characterized in that if the diluent in the diluent The total content of the synthetic fiber treatment agent and the volatile diluent is 100% by mass, the synthetic fiber treatment agent 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 diluted solution at 30°C is more than 0mm ² /s and less than 70mm ² /s (excluding the case of 70mm ² /s), the diluted solution should be used for spinning stretchers In the spinning stretching step, the spinning stretching machine is provided with a plurality of heating rollers for stretching the spun yarn, and the number of windings of each heating roller in the spinning stretching step is more than 0 and 3 Times or less. The diluent of the synthetic fiber treatment agent of claim 1, wherein the non-volatile part in the diluent has a dynamic viscosity of 10 to 70 mm ² /s at 30°C. The diluent of the synthetic fiber treatment agent of claim 1 or 2, wherein the kinematic viscosity of the diluent at 30° C. is 10 to 70 mm ² /s (where 70 mm ² /s is excluded). The diluent of the synthetic fiber treatment agent of claim 1 or 2, wherein the kinematic viscosity of the diluent at 30°C is 20 to 65 mm ² /s. The diluent of the synthetic fiber processing agent of claim 1 or 2, wherein if the total content of the synthetic fiber processing agent and the volatile diluent in the diluent is 100% by mass, the diluent contains The ratio of the synthetic fiber treatment agent is 65 to 98% by mass and the volatile diluent is 2 to 35% by mass. The diluent of the synthetic fiber processing agent according to claim 5 contains 70 to 95% by mass of the synthetic fiber processing agent and 5 to 30% by mass of the volatile diluent. The diluent of the synthetic fiber processing agent according to claim 5 contains 75 to 92% by mass of the synthetic fiber processing agent and 8 to 25% by mass of the volatile diluent. The diluent of the synthetic fiber treatment agent of claim 1 or 2, wherein the volatile diluent contains water. The diluent of the synthetic fiber treatment agent of claim 1 or 2, wherein the smoothing agent contains fatty acid esters with a total carbon number of 24 to 32 in the molecule. The diluent of the synthetic fiber treatment agent according to claim 1 or 2, wherein the antistatic agent contains at least one compound selected from fatty acid salt, organic phosphate, organic sulfonate, amphoteric complex, and quaternary ammonium salt . The diluent of the synthetic fiber processing agent of claim 1 or 2, wherein the total content of the smoothing agent, nonionic surfactant, and antistatic agent in the synthetic fiber processing agent is 100% by mass, The diluent contains the smoothing agent 30 to 80% by mass, the nonionic surfactant 5 to 70% by mass, and the antistatic agent in a ratio of 1 to 20% by mass. A method for producing synthetic fibers, comprising: using the diluent of the synthetic fiber processing agent of any one of claims 1 to 11 as a synthetic fiber processing agent in a ratio of 0.1-20% by mass , The step of attaching synthetic fiber threads, and using a spinning stretcher equipped with a plurality of heating rollers for stretching the spun thread, and the number of windings of the threads on each heating roller exceeds 0 times and 3 times or less spinning stretching step.