JP2017066554A - Treatment agent for synthetic fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment agent for synthetic fiber for manufacturing a high quality synthetic fiber good in operability and less in fuzz even under a high draw ratio and high speed spinning condition.SOLUTION: There is provided a treatment agent for synthetic fiber containing a thixotropic property adding agent (A) and an extreme pressure agent (B) as essential components and having thixotropy index at 75°C measured by a rheometer of the treatment agent for synthetic fiber of 1.4 to 3.0 and high temperature low speed friction coefficient to metal at 230°C measured by friction test machine of 0.250 to 0.344.SELECTED DRAWING: None

Description

  The present invention relates to a treatment agent for synthetic fibers (hereinafter sometimes abbreviated as a treatment agent). More specifically, it is a treatment agent for synthetic fibers that suppresses the occurrence of yarn breakage and fluff at the time of stretching by enhancing the heat stretchability and heat treatment properties in the synthetic fiber production process and enhancing the extreme pressure property.

Conventionally, various treatment agents have been used to facilitate the spinning and drawing processes of synthetic fibers. However, in recent years, in order to improve quality and productivity, the draw ratio has been increased and the spinning / drawing speed has been increased. This has led to problems such as yarn breakage and fluff in the spinning / drawing process. It is easy. In order to provide synthetic fibers with high operability and high quality under such harsh conditions, the followability and uniform adhesion of the treatment agent to the yarn in the stretch deformation part, friction between the yarn and the metal draw roller ( Treatment performance such as smoothness), extreme pressure (oil film strength), and heat resistance are extremely important factors.
Conventionally, a synthetic fiber treatment agent with improved extreme pressure and smoothness (Patent Document 1), an alkylene oxide adduct of a polyhydric alcohol fatty acid ester, and an alkylene oxide of a monohydric alcohol as a synthetic fiber treatment agent with improved productivity A treatment agent for synthetic fibers containing an adduct (Patent Document 2), a treatment agent containing an emulsifier and a hindered phenol heat-resistant agent (Patent Documents 3 and 4), and the like have been proposed.

JP-A-6-346367 JP 2005-213676 A Japanese Patent Laying-Open No. 2015-028231 JP2015-028232A

However, the synthetic fiber treatment agents described in Patent Documents 1 to 4 have failed to obtain a synthetic fiber satisfying a sufficient quality under the high draw ratio and high speed spinning conditions that have recently been demanded.
An object of the present invention is to provide a treating agent for synthetic fibers for producing high-quality synthetic fibers with good operability and little fluff even under high draw ratio and high-speed spinning conditions.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have reached the present invention. That is, the synthetic fiber treatment agent of the present invention is a synthetic fiber treatment agent containing the thixotropic property-imparting agent (A) and the extreme pressure agent (B) as essential components, and is measured with a rheometer of the synthetic fiber treatment agent. The synthetic fiber treatment agent has a thixotropy index at 75 ° C. of 1.4 to 3.0 and a high temperature / low speed friction coefficient against metal measured by a friction tester of 0.250 to 0.344.

  The treating agent for synthetic fibers of the present invention is excellent in extreme pressure necessary for increasing the draw ratio in the spinning / drawing process, and has the ability to follow the yarn of the treating agent necessary for increasing the spinning / drawing speed. Since it is excellent, it is possible to provide a high-quality synthetic fiber under a high draw ratio and a high-speed spinning condition.

FIG. 1 is a conceptual diagram of a direct spinning drawing apparatus preferably used in the present invention.

The processing agent for synthetic fibers of the present invention comprises a thixotropic agent (A) and an extreme pressure agent (B) as essential components.
By including the thixotropy-imparting agent (A) in the treatment agent, followability and smoothness of the treatment agent to the yarn can be obtained, and a synthetic fiber excellent in fluff quality can be obtained under high draw ratio and high-speed yarn production conditions.
By including the extreme pressure agent (B) in the treatment agent, sufficient extreme pressure properties can be obtained, the yarn does not break oil film with the metal roller, and fluff under high draw ratio and high speed yarn production conditions Synthetic fibers with excellent quality can be obtained.

  In the present invention, thixotropy is a property of having a high viscosity at a low shear rate and a viscosity decrease depending on time at a high shear rate. It is presumed that the higher the thixotropy index of the treatment agent, the lower the viscosity of the treatment agent with respect to the deformation of the yarn at the stretched portion, so that the followability of the treatment agent at the stretched portion is improved. That is, since the thixotropy index is a characteristic that the viscosity decreases with time depending on the shear rate, the oil film breakage due to shear stress is suppressed by maintaining a high viscosity at the initial stage of necking where the shear stress applied to the treatment agent is the highest, It is considered that while the shear stress and shear rate continue to be applied in the subsequent stretching process, the viscosity decreases with time, the followability to stretching deformation is improved, and fibers with excellent fluff quality can be obtained. Also, when stretching on a roller, the lower the low coefficient of friction against metal, the higher the extreme pressure, and the thicker the oil film is kept and the oil film breakage is suppressed, thus preventing an increase in friction between the yarn and the roller and direct contact. It is speculated that fibers with excellent fluff quality can be obtained.

The treating agent for synthetic fibers of the present invention is preferably a compound represented by the general formula (1) from the viewpoint of followability of the treating agent to the yarn, with the thixotropic agent (A) as an essential component.
In the general formula (1), R has 8 to 18 carbon atoms. From the viewpoint of followability of the treating agent to the yarn, an alkyl group having 12 to 18 carbon atoms is preferable.
Examples of the linear or branched alkyl group having 8 to 18 carbon atoms include octyl group, 2-ethylhexyl group, decyl group, isodecyl group, undecyl group, isoundecyl group, dodecyl group, isododecyl group, tridecyl group, isotridecyl group, tetradecyl group , Pentadecyl group, hexadecyl group, octadecyl group and isooctadecyl group.
Among these, a dodecyl group, a hexadecyl group, and an octadecyl group are preferable from the viewpoint of followability of the treatment agent to the yarn.

Specific examples of the thixotropic agent (A) include 2,4-bis (n-octylthiomethyl) -6-methylphenol, 2,4-bis (n-decylthiomethyl) -6-methylphenol, 2, 4-bis (n-dodecylthiomethyl) -6-methylphenol, 2,4-bis (n-tetradecylthiomethyl) -6-methylphenol, 2,4-bis (n-hexadecylthiomethyl) -6 And compounds such as -methylphenol and 2,4-bis (n-octadecylthiomethyl) -6-methylphenol.
Of these, 2,4-bis (n-dodecylthiomethyl) -6-methylphenol, 2,4-bis (n-hexadecylthiomethyl)-from the viewpoint of improving the followability of the treating agent to the yarn 6-methylphenol and 2,4-bis (n-octadecylthiomethyl) -6-methylphenol are preferred.

  The content of the thixotropy imparting agent (A) in the synthetic fiber treatment agent is preferably 8 to 25 weights based on the weight of the synthetic fiber treatment agent from the viewpoint of improving the followability of the treatment agent to the yarn. %, More preferably 10 to 25% by weight.

  The thixotropic agent (A) in the treating agent for synthetic fibers can be obtained, for example, by a known reaction in which an alkanethiol having 8 to 18 carbon atoms is reacted with O-cresol and paraformaldehyde in the presence of an amine. .

The treatment agent for synthetic fibers of the present invention comprises an extreme pressure agent (B) as an essential component, and as an extreme pressure agent (B), from the viewpoint of extreme pressure, an alkylene oxide adduct (B1) of vegetable oil, a monovalent fatty acid, It is preferably an ester with one or more acids (B2) selected from the group consisting of dibasic acids and dibasic acid anhydrides.
Moreover, (B) may use together 2 or more types suitably as desired.

Examples of the vegetable oil of the ester constituting the extreme pressure agent (B) include coconut oil, palm oil, castor oil, and hardened castor oil.
Among these, castor oil and hydrogenated castor oil are preferable as the vegetable oil from the viewpoint of improving extreme pressure.

Examples of the alkylene oxide constituting the extreme pressure agent (B) include alkylene oxides having 2 to 4 carbon atoms, specifically ethylene oxide (hereinafter abbreviated as EO), 1,2-propylene oxide (hereinafter referred to as “EO”). , PO), 1,2-butylene oxide (hereinafter abbreviated as BO), tetrahydrofuran (hereinafter abbreviated as THF), and the like.
Of these, EO and PO are preferred from the viewpoint of extreme pressure. The addition method may be block addition or random addition. From the viewpoint of improving extreme pressure, the number of added moles of alkylene oxide is preferably 1 to 100, and more preferably 10 to 80.

Specific examples of the alkylene oxide adduct (B1) of vegetable oil include castor oil EO 20-30 mol adduct (castor oil EO 10 mol adduct, etc.), castor oil PO 20 mol adduct, castor oil EO 15 mol, PO 15 mol. Random adduct, hydrogenated castor oil BO 13 mol adduct, hydrogenated castor oil EO 20-30 mol adduct (hardened castor oil EO 25 mol adduct, etc.) and castor oil PO 8 mol adduct and hydrogenated castor oil PO 20 mol EO9 mole block adduct and the like.
Among these, as an alkylene oxide adduct (B1) of vegetable oil, from the viewpoint of improving extreme pressure, an EO 20-30 mol adduct of castor oil and an EO 20-30 mol adduct of hydrogenated castor oil are preferable.

Examples of the acid of the ester constituting the extreme pressure agent (B) include one or more acids selected from the group consisting of monovalent fatty acids, dibasic acids, and dibasic acid anhydrides.
Examples of the monovalent fatty acid include linear or branched monovalent fatty acids having 8 to 18 carbon atoms.
As monovalent fatty acids, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, capric acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, stearic acid, isostearic acid, coconut oil fatty acid, palm oil fatty acid, cured Castor oil fatty acid, hardened beef tallow fatty acid and the like.
Examples of the dibasic acid include saturated aliphatic dicarboxylic acids having 2 to 24 carbon atoms, unsaturated aliphatic carboxylic acids having 2 to 24 carbon atoms, and aromatic dicarboxylic acids having 2 to 24 carbon atoms. Specifically, oxalic acid, malonic acid, succinic acid, adipic acid and sebacic acid, maleic acid, fumaric acid, phthalic acid, terephthalic acid, isophthalic acid, succinic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid and And sebacic acid.
Examples of the dibasic acid anhydride include C2-C24 dicarboxylic acid anhydrides (such as maleic anhydride and phthalic anhydride).

Among these, as the monovalent fatty acid constituting the extreme pressure agent (B), a straight chain fatty acid is preferable from the viewpoint of improving smoothness. Specifically, myristic acid, palmitic acid and stearic acid.
Further, as the dibasic acid or dibasic acid anhydride constituting the extreme pressure agent (B), adipic acid, sebacic acid, phthalic acid, maleic anhydride and phthalic anhydride are preferable from the viewpoint of improving extreme pressure.

  As the extreme pressure agent (B), from the viewpoint of improving extreme pressure properties, a polyester of hydrogenated castor oil EO 20 mol adduct, phthalic acid and stearic acid, and a polyester of castor oil EO 25 mol adduct, adipic acid and stearic acid are preferable. .

  The content of the extreme pressure agent (B) in the treatment agent for synthetic fibers is preferably 20 to 40% by weight, more preferably, based on the weight of the treatment agent for synthetic fibers, from the viewpoint of improving extreme pressure properties. 28 to 40% by weight.

  The extreme pressure agent (B) in the synthetic fiber treating agent can be obtained by a known esterification reaction. For example, the alkylene oxide adduct of the vegetable oil and the acid can be produced by an esterification reaction or the like in the presence of an acidic catalyst such as paratoluenesulfonic acid.

The treating agent for synthetic fibers of the present invention has a thixotropy index at 75 ° C. measured by a rheometer of 1.4 to 3.0, and a high temperature / low speed coefficient of friction against metal measured by a friction tester of 0.250. -0.344 is satisfied. Preferably, the thixotropy index at 75 ° C. measured with a rheometer is 1.5 to 2.2, and the high temperature to low metal friction coefficient measured with a friction tester is 0.300 to 0.330, More preferably, the thixotropy index at 75 ° C. measured with a rheometer is 1.6 to 2.0, and the high temperature / low speed coefficient of friction against metal measured with a friction tester is 0.301 to 0.329. .
If the thixotropy index and / or high-temperature low-temperature friction coefficient against the metal is outside the above numerical range, sufficient thixotropy cannot be obtained, the followability of the treatment agent to the yarn in the stretched portion is reduced, and a high draw ratio / The quality of synthetic fibers deteriorates under high speed spinning conditions.

The thixotropy index in the present invention is a thixotropy index measured using a rheometer AR2000 manufactured by TA Instruments Japan Co., Ltd. and changing the treatment agent at 75 ° C. and changing the shear rate from 0 to 1000 s ^−1. Point to. The thixotropy index is calculated from the viscosity ratio of 0.1 s ⁻¹ and 1 s ⁻¹ in the rheological data represented by the following formula (2), and is taken as the average value of two trials.
Thixotropic index = η (0.1 s ⁻¹ ) / η (1 s ⁻¹ ) (2)

  In the treatment agent for synthetic fibers of the present invention, as a method for adjusting the thixotropy index at 75 ° C. measured with a rheometer to a numerical range of 1.4 to 3.0, a thixotropic agent (A) is used for synthetic fibers. Examples thereof include a method of containing 8 to 25% by weight based on the weight of the treating agent.

  The low coefficient of friction against metal in the present invention refers to a yarn to which a treating agent is applied at a yarn speed of 0.2 m / min, an initial tension of 900 g, using a friction tester YF850 manufactured by Toray Engineering Co., Ltd. The coefficient of friction is calculated from the tension after contact with a fixed metal pin (surface Cr matte plating) friction body at 540 ° C. at 230 ° C., and the average value of the number of trials twice indicates the low metal friction coefficient. The test yarn was 470 decitex, 72 filament nylon 66 filament treated so that the amount of oil was 1% by weight.

  The treatment agent for synthetic fibers of the present invention is prepared by using an extreme pressure agent (B) as a synthetic fiber as a method of adjusting the high temperature / low speed friction coefficient against metal measured by a friction tester to a numerical value range of 0.250 to 0.344. And a method of containing 20 to 40% by weight based on the weight of the treating agent.

In the treatment agent for synthetic fibers of the present invention, an emulsifier (C), a smoothing agent (D), and other optional components (E) can be blended within a range that does not impair the performance.
The emulsifier (C) is preferably a monohydric alcohol type nonionic surfactant and / or a polyhydric alcohol type nonionic surfactant.
Examples of the monohydric alcohol type nonionic activator include an alkylene oxide adduct (C1) of a linear or branched monohydric alcohol having 1 to 30 carbon atoms.
Examples of the polyhydric alcohol type nonionic surfactant include an alkylene oxide adduct (C2) of a polyhydric alcohol fatty acid ester, an alkylene oxide adduct (C3) of an animal and vegetable oil having a hydroxyl group, and a fatty acid ester (C4) of (C3). Is mentioned.
Moreover, (C) may be used in combination of two or more kinds as desired.

  As a linear or branched monohydric alcohol having 1 to 30 carbon atoms, a linear or branched monohydric alcohol having 1 to 30 carbon atoms (methanol, ethanol, propanol, isopropanol, butanol, pentanol, heptanol, octanol, 2- Ethylhexanol, decanol, isodecanol, undecanol, isoundecanol, dodecanol, isododecanol, tridecanol, isotridecanol, tetradecanol, pentadecanol, hexadecanol, octadecanol, isooctadecanol, oleyl alcohol 2-octyldecanol, 2-decyldodecanol, 2-decyltetradecanol, 2-decylpentadecanol, 2-undecyltetradecanol and 2-undecylpentadecanol) Id adducts.

Examples of the alkylene oxide added to the monohydric alcohol include alkylene oxides having 2 to 4 carbon atoms, and specifically include EO, PO, BO, and THF.
Of these, EO and PO are preferred.

Specific examples of the alkylene oxide adduct (C1) of a linear or branched monohydric alcohol having 1 to 30 carbon atoms include 2-ethylhexanol EO 20 mol adduct, 2-ethylhexanol PO 15 mol · EO 20 mol adduct, oleyl alcohol PO10 Mole adducts, butanol EO 10 mol PO 8 mol random adduct, octanol PO 15 mol · EO 10 mol block adduct, and the like.
Among these, from the viewpoint of improving emulsification, (C1) is preferably 2-ethylhexanol PO15 mol · EO 20 mol adduct and octanol PO15 mol · EO 10 mol block adduct.

Examples of alkylene oxide adducts (C2) of polyhydric alcohol fatty acid esters include polyhydric alcohols having 2 to 6 carbon atoms (dihydric alcohols (such as 1,4-butanediol, 1,6-hexanediol and neopentyl glycol)) and Aliphatic carboxylic acid having 8 to 24 carbon atoms [aliphatic saturated carboxylic acid (caprylic acid, 2-ethylhexanoic acid, pelargonic acid) of a tri- to hexavalent alcohol (such as glycerin, trimethylolpropane, pentaerythritol, sorbitol and sorbitan)] , Capric acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, stearic acid and isostearic acid), aliphatic unsaturated carboxylic acids (such as oleic acid, linoleic acid and linolenic acid), animal and vegetable oil fatty acids (palm) Oil fatty acid, palm oil fatty acid, castor oil Fatty acid, hydrogenated castor oil fatty acid, beef tallow fatty acid, hardened beef tallow fatty acid, pork tallow fatty acid and the like)] ester alkylene oxide adduct and the like.
Specifically, trimethylolpropane and EO 20 mol adduct and myristic acid diester, glyceryl beef tallow fatty acid ester EO 15 mol adduct, trimethylolpropane stearate EO 20 mol adduct, pentaerythritol oleate ester EO 30 mol Examples include adducts, EO 20 mol adduct of sorbitan oleate and EO 40 mol adduct of sorbitol stearate.
Among these, from the viewpoint of improving emulsifiability, (C2) is preferably trimethylolpropane, EO 20 mol adduct, and myristic acid diester.

Examples of the alkylene oxide adduct (C3) of an animal and vegetable oil having a hydroxyl group include an alkylene oxide adduct of an animal and vegetable oil (such as hydrogenated castor oil) having a hydroxyl group. Specific examples include an EO 15 mol adduct of castor oil, an EO 10 mol adduct of hydrogenated castor oil, and an EO 25 mol adduct of hydrogenated castor oil.
Among these, EO15 mol adduct of castor oil is preferable as (C3) from the viewpoint of improving emulsifiability.

Examples of the fatty acid ester (C4) of the alkylene oxide adduct (C3) of animal and vegetable oils having a hydroxyl group include aliphatic carboxylic acids of [C3] having 8 to 24 carbon atoms [aliphatic saturated carboxylic acid (caprylic acid, 2-ethylhexane). Acids, pelargonic acid, capric acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, stearic acid, and isostearic acid), aliphatic unsaturated carboxylic acids (oleic acid, linoleic acid, linolenic acid, etc.), animals and plants Oil fatty acid (coconut oil fatty acid, palm oil fatty acid, castor oil fatty acid, hydrogenated castor oil fatty acid, beef tallow fatty acid, hardened beef tallow fatty acid, pork tallow fatty acid and the like)] and the like.
Specifically, stearic acid ester of castor oil EO 43 mol adduct, oleic acid ester of hydrogenated castor oil EO 20 mol adduct and beef tallow fatty acid ester of castor oil EO 25 mol adduct, trioleate of oleic acid trihydrate of hydrogenated castor oil EO 25 mol adduct Examples include esters. Of these, oleic acid triester of hydrogenated castor oil EO 25 mol adduct is preferred.

  Among the emulsifiers (C), from the viewpoint of emulsifiability, an alkylene oxide adduct (C1) of a linear or branched monohydric alcohol having 1 to 30 carbon atoms, an alkylene oxide adduct (C2) of a polyhydric alcohol fatty acid ester and a hydroxyl group Preferred is an alkylene oxide adduct (C3) of animal and vegetable oils having a combination of (C1), (C2) and (C3).

  The content of the emulsifier (C) in the synthetic fiber treatment agent is preferably 2 to 17% by weight or less, more preferably 3 based on the weight of the synthetic fiber treatment agent, from the viewpoint of improving emulsifying properties. ~ 15% by weight.

As the smoothing agent (D), an ester (D1) of an alkylene oxide adduct of a monohydric alcohol and a divalent fatty acid or a sulfur-containing divalent fatty acid, an ester of an alkylene oxide adduct of a polyhydric alcohol and a monovalent fatty acid (D2) ), Animal and vegetable oil (D3), ester (D4) of monohydric alcohol and monovalent fatty acid (D4), ester (D5) of monohydric alcohol and divalent fatty acid or sulfur-containing divalent fatty acid, polyhydric alcohol and monovalent fatty acid, (D6) etc. are mentioned.
Moreover, (D) may use together 2 or more types suitably if desired.

  As the monohydric alcohol constituting the ester (D1) of an alkylene oxide adduct of a monohydric alcohol and a divalent fatty acid or sulfur-containing divalent fatty acid, a linear or branched monohydric alcohol having 8 to 26 carbon atoms is preferable. Octanol, 2-ethylhexanol, decanol, isodecanol, undecanol, isoundecanol, dodecanol, isododecanol, tridecanol, isotridecanol, tetradecanol, pentadecanol, hexadecanol, octadecanol, isooctadecanol And oleyl alcohol, 2-octyldecanol, 2-decyldodecanol, 2-decyltetradecanol, 2-decylpentadecanol, 2-undecyltetradecanol and 2-undecylpentadecanol. .

Examples of the alkylene oxide added to the monohydric alcohol constituting the ester (D1) of an alkylene oxide adduct of a monohydric alcohol and a divalent fatty acid or a sulfur-containing divalent fatty acid include alkylene oxides having 2 to 4 carbon atoms. Specific examples include EO, PO, BO and THF. Of these, EO and PO are preferred.
Examples of the alkylene oxide constituting the ester (D1) of an alkylene oxide adduct of a monohydric alcohol and a divalent fatty acid or sulfur-containing divalent fatty acid include EO, PO, BO, and THF. Of these, EO and PO are preferred. The addition method may be block addition or random addition. The number of moles of alkylene oxide added is preferably 1 to 100 moles, and more preferably 1 to 20 moles.

  A known method or the like can be applied to the addition of the alkylene oxide to the monohydric alcohol. For example, an alkylene oxide adduct can be obtained by adding an alkylene oxide to a monohydric alcohol in the presence of a catalyst. The reaction temperature is preferably 10 to 180 ° C, and more preferably 80 to 170 ° C. The reaction time is preferably 1 to 48 hours, and more preferably 5 to 24 hours. Alkylene oxides may be used alone or in admixture of two or more. When adding 2 or more types of alkylene oxide, the addition mode is not specifically limited, Random addition or block addition may be sufficient. Catalysts used for adding alkylene oxide include alkali catalysts (such as potassium hydroxide and sodium hydroxide), acidic catalysts (perhalogen acid (salt), sulfuric acid (salt), phosphoric acid (salt), and nitric acid (salt). Etc.], metal alcoholate catalysts (such as sodium methylate and potassium butyrate) and the like.

  Examples of the divalent fatty acid having 4 to 10 carbon atoms constituting the ester (D1) of an alkylene oxide adduct of a monohydric alcohol and a divalent fatty acid or a sulfur-containing divalent fatty acid include succinic acid, glutaric acid, adipic acid, and pimelic acid , Suberic acid, azelaic acid and sebacic acid.

  Examples of the sulfur-containing divalent fatty acid constituting the ester (D1) of an alkylene oxide adduct of a monohydric alcohol and a divalent fatty acid or a sulfur-containing divalent fatty acid include thiodiacetic acid, thiodipropionic acid, thiodibutyric acid, and thiodivaleric acid. Is mentioned.

Specific examples of the ester (D1) of an alkylene oxide adduct of a monohydric alcohol and a divalent fatty acid or a sulfur-containing divalent fatty acid include esters of octanol EO 3 mol adduct and sebacic acid, decanol EO 2 mol adduct and sebacic acid Ester, dodecanol EO 3 mol adduct and adipic acid, tridecanol EO 3 mol adduct and adipic acid ester, oleyl alcohol EO 4 mol adduct and adipic acid ester, dodecanol EO 3 mol adduct and thiodipropion Esters of acids, esters of 2-dodecanol EO3 molar adduct with thiodipropionic acid, esters of tridecanol EO3 molar adduct with thiodipropionic acid and esters of branched tridecanol EO3 molar adduct with thiodipropionic acid Can be mentioned.
Among these, from the viewpoint of smoothness, diesters of oleyl alcohol EO 5 mol adduct with thiodipropionic acid and lauryl alcohol EO 10 mol adduct adipic acid diester are preferred.

  Examples of the polyhydric alcohol having 2 to 6 carbon atoms constituting the ester (D2) of an alkylene oxide adduct of a polyhydric alcohol and a monovalent fatty acid include dihydric alcohols (1,4-butanediol, 1,6-hexanediol). And neopentyl glycol) and tri- and hexavalent alcohols (glycerin, trimethylolpropane, pentaerythritol, sorbitol, sorbitan, and the like).

  Examples of the alkylene oxide to be added to the polyhydric alcohol constituting the ester (D2) of the polyhydric alcohol alkylene oxide adduct and the monovalent fatty acid include C2-C4 alkylene oxide, specifically, EO, PO, BO and THF are mentioned. Of these, EO and PO are preferred. The addition method may be block addition or random addition. The number of moles of alkylene oxide added is preferably 1 to 100 moles, and more preferably 1 to 20 moles.

  A known method or the like can be applied to the addition of alkylene oxide to the polyhydric alcohol. For example, an alkylene oxide adduct can be obtained by adding an alkylene oxide to a polyhydric alcohol in the presence of a catalyst. The reaction temperature is preferably 10 to 180 ° C, and more preferably 80 to 170 ° C. The reaction time is preferably 1 to 48 hours, and more preferably 5 to 24 hours. Alkylene oxides may be used alone or in admixture of two or more. When adding 2 or more types of alkylene oxide, the addition mode is not specifically limited, Random addition or block addition may be sufficient. Catalysts used for adding alkylene oxide include alkali catalysts (such as potassium hydroxide and sodium hydroxide), acidic catalysts (perhalogen acid (salt), sulfuric acid (salt), phosphoric acid (salt), and nitric acid (salt). Etc.], metal alcoholate catalysts (such as sodium methylate and potassium butyrate) and the like.

  As the monovalent fatty acid constituting the ester (D2) of an alkylene oxide adduct of a polyhydric alcohol and a monovalent fatty acid, a linear or branched monovalent fatty acid having 8 to 26 carbon atoms is preferable. Specifically, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, capric acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, linolenic acid, Examples include ricinoleic acid, coconut oil fatty acid, palm oil fatty acid, castor oil fatty acid, hardened castor oil fatty acid, beef tallow fatty acid, hardened beef tallow fatty acid, and tallow fatty acid.

Specific examples of the ester (D2) of an alkylene oxide adduct of a polyhydric alcohol and a monovalent fatty acid include beef tallow fatty acid ester of neopentyl glycol EO 2 mol adduct, oleic acid ester of glycerin EO 3 mol adduct, trimethylolpropane EO3 Mole adduct laurate, trimethylolpropane EO 3 mol adduct palm oil fatty acid ester, trimethylolpropane EO 5 mol adduct palm oil fatty acid ester, pentaerythritol EO 4 mol adduct pelargonate, pentaerythritol EO 5 mol adduct 2-ethylhexanoic acid ester of the product and oleic acid ester of sorbitan EO 4 mol adduct.
Among these, from the viewpoint of smoothness, a triester of trimethylolpropane, EO 30 mol adduct and lauric acid, an ester of trimethylolpropane EO 3 mol adduct and coconut oil fatty acid, and pentaerythritol EO 5 mol adduct and 2-ethyl Esters with hexanoic acid are preferred.

  Specific examples of the animal and vegetable oil (D3) include coconut oil, palm oil, castor oil, hydrogenated castor oil, beef tallow, hydrogenated beef tallow and lard.

  Examples of the monohydric alcohol constituting the ester (D4) of monohydric alcohol and monohydric fatty acid include linear or branched monohydric alcohol having 8 to 26 carbon atoms. Specifically, octanol, 2-ethylhexanol, decanol, isodecanol, undecanol, isoundecanol, dodecanol, isododecanol, tridecanol, isotridecanol, tetradecanol, pentadecanol, hexadecanol, octadecanol, octadecanol Nord, isooctadecanol, oleyl alcohol, 2-octyldecanol, 2-decyldodecanol, 2-decyltetradecanol, 2-decylpentadecanol, 2-undecyltetradecanol and 2-undecylpentadecane And the like.

  Examples of the monovalent fatty acid constituting the ester (D4) of a monohydric alcohol and a monovalent fatty acid include linear or branched monovalent fatty acids having 8 to 26 carbon atoms. Specifically, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, capric acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, linolenic acid, Examples include ricinoleic acid, coconut oil fatty acid, palm oil fatty acid, castor oil fatty acid, hardened castor oil fatty acid, beef tallow fatty acid, hardened beef tallow fatty acid and pork tallow fatty acid.

Specific examples of the ester (D4) of monohydric alcohol and monohydric fatty acid include octyl palmitate, octyl stearate, 2-ethylhexyl stearate, 2-tridecyl stearate, oleyl oleate and 2-decyl tetradecyl oleate. Can be mentioned.
Of these, 2-ethylhexyl stearate and oleyl oleate are preferred.

Examples of the monohydric alcohol constituting the ester (D5) of the monohydric alcohol and the divalent fatty acid or sulfur-containing divalent fatty acid include linear or branched monohydric alcohols having 8 to 26 carbon atoms.
Specifically, octanol, 2-ethylhexanol, decanol, isodecanol, undecanol, isoundecanol, dodecanol, isododecanol, tridecanol, isotridecanol, tetradecanol, pentadecanol, hexadecanol, octadecanol, octadecanol Nord, isooctadecanol, oleyl alcohol, 2-octyldecanol, 2-decyldodecanol, 2-decyltetradecanol, 2-decylpentadecanol, 2-undecyltetradecanol and 2-undecylpentadecane Nord.

Examples of the divalent fatty acid constituting the ester (D5) of a monohydric alcohol and a divalent fatty acid or a sulfur-containing divalent fatty acid include divalent fatty acids having 4 to 10 carbon atoms.
Specific examples include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid and sebacic acid.

  Examples of the divalent fatty acid or sulfur-containing divalent fatty acid constituting the ester (D5) of a monohydric alcohol and a divalent fatty acid or sulfur-containing divalent fatty acid include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, and azelain. Examples include acid, sebacic acid, thiodiacetic acid, thiodipropionic acid, thiodibutyric acid, and thiodivaleric acid.

Specific examples of the ester (D5) of monohydric alcohol and divalent fatty acid or sulfur-containing divalent fatty acid include, for example, octanol sebacic acid ester, decanol sebacic acid ester, dodecanol adipic acid ester, tridecanol adipic acid ester Oleyl alcohol adipate, dodecanol thiodipropionate, 2-dodecanol thiodipropionate, tridecanol thiodipropionate, 2-tridecanol thiodipropionate, 2-octyldecanol Thiodipropionate ester, 2-decyltetradecanol thiodipropionate ester, 2-decylpentadecanol thiodipropionate ester, 2-undecyltetradecanol thiodipropionate ester Thiodipropionic acid esters of Le and 2-undecyl-pentadecanol and the like.
Of these, thiodipropionate ester of 2-decylpentadecanol, thiodipropionate ester of 2-undecyltetradecanol, thiodipropionate ester of 2-undecylpentadecanol and 2-octyldodecanol Thiodipropionic acid diester is preferred.

Examples of the polyhydric alcohol constituting the ester (D6) of polyhydric alcohol and monovalent fatty acid include polyhydric alcohols having 3 to 6 carbon atoms.
Specifically, dihydric alcohols (1,4-butanediol, 1,6-hexanediol, neopentyl glycol, etc.), trivalent to hexavalent alcohols (glycerin, trimethylolpropane, pentaerythritol, sorbitol, sorbitan, etc.), etc. Is mentioned.

Examples of the monovalent fatty acid constituting the ester (D6) of a polyhydric alcohol and a monovalent fatty acid include linear or branched monovalent fatty acids having 8 to 26 carbon atoms.
Specifically, caprylic acid, 2-ethylhexanoic acid, pelargonic acid, capric acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, linolenic acid, Examples include ricinoleic acid, coconut oil fatty acid, palm oil fatty acid, castor oil fatty acid, hardened castor oil fatty acid, beef tallow fatty acid, hardened beef tallow fatty acid and pork tallow fatty acid.

  Specific examples of esters of polyhydric alcohols and monovalent fatty acids (D6) include neopentyl glycol beef tallow fatty acid esters, glycerin oleic acid esters, trimethylolpropane lauric acid esters, trimethylolpropane Examples include coconut oil fatty acid ester, pelargonic acid ester of pentaerythritol, 2-ethylhexanoic acid ester of pentaerythritol, and oleic acid ester of sorbitan.

  The content of the smoothing agent (D) in the synthetic fiber treatment agent is preferably 18 to 70% by weight, more preferably 21 based on the weight of the synthetic fiber treatment agent from the viewpoint of improving smoothness. ~ 53 wt%.

  Other optional components (E) include, for example, antistatic agents (phosphates and fatty acid soaps, etc.), pH adjusters (alkalis such as sodium hydroxide and potassium hydroxide, alkylamines and alkylene oxide adducts of alkylamines, etc.) Amines, organic acids such as oleic acid), surface conditioners (such as polydimethylsiloxane and alkyl-modified silicone), antioxidants (such as hindered phenolic antioxidants such as Irganox 245 and Irganox 565), 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid-2-decyltetradecyl etc.), ultraviolet absorbers, viscosity modifiers, appearance modifiers and the like.

  The content of the optional component (E) in the synthetic fiber treatment agent is preferably 10% by weight or less based on the weight of the synthetic fiber treatment agent.

  The treating agent for synthetic fibers of the present invention contains thixotropic agent (A), extreme pressure agent (B), emulsifier (C), smoothing agent (D), and optional component (E), at room temperature or If necessary, it can be obtained by heating (for example, 30 ° C. to 70 ° C.) and mixing uniformly. The blending order and blending method of each component are not particularly limited.

As a method for treating the synthetic fiber treatment agent of the present invention with synthetic fibers, for example, the treatment agent of the present invention can be adhered to 0.4 to 3.0% by weight based on the weight of the synthetic fiber.
As a method for attaching the treatment agent to the synthetic fiber, a known method or the like can be used, and the treatment agent can be applied before the spinning step, the drawing step or the winding using a roller or a guide oiling device.
For example, polyamide 66 chips having a relative viscosity of sulfuric acid of 3.2 to 3.8 can be melted and kneaded with an extruder type spinning machine. The spinning temperature is 280 to 310 ° C., and the yarn can be discharged from the die and spun. The spun yarn can be cooled and solidified by a cold air apparatus at normal temperature of 10 to 25 ° C. Next, after the yarn is focused by a yarn path regulation guide, a non-aqueous treatment agent containing compounds (A) to (C) is applied, wound on a godet roller group, taken up at a predetermined speed, and aligned. It is done. As a method for applying the treatment agent, an oiling device or guide oiling is preferable.
The take-up speed is preferably 350 to 1100 m / min. The take-up yarn can be wound around a plurality of godet rollers that are sequentially rotated at a high speed without being wound once, and can be drawn by a speed difference between the rollers. Usually, after two or more stages of stretching, the film can be wound after being relaxed. Stretch stretching / first-stage stretching is performed by heat stretching around the glass transition temperature, and the final stretching and heat setting temperature can be generally performed at a high temperature of 230 to 250 ° C. A draw ratio can be normally performed in the range of 3-6 times. Note that. The winding speed is usually 2000 to 6000 m / min, and the winding tension can be wound in a cheese shape by a winding device under the condition of 20 to 250 gf.
FIG. 1 is a conceptual diagram of a direct spinning / drawing apparatus that can be used with the treatment agent of the present invention.

A preferred method in the case of directly spinning and drawing the treating agent of the present invention will be described below with reference to FIG. 1 as an example.
In the spinning section, polyamide 66 chips are melted and kneaded with an extruder type spinning machine, and discharged from the die to spin. The spun yarn 5 spun from the spinneret 1 is cooled by a cooling air 4 of 10 ° C. to 25 ° C. by a cross flow cooling device 3 through a heating cylinder 2. The cooled yarn 5 passes through the duct 6 and is taken up by the take-up roller 8 while being applied with the treatment agent by the oil supply device 7. The drawn yarn 5 is pre-stretched between the take-up roller 8 and the yarn supply roller 9. Thereafter, the first stretching roller 10 and the second stretching roller 11 perform two-stage stretching, and the relaxation roller 12 relaxes. The relaxed yarn 5 is entangled by the entanglement imparting device 13, wound by the winder 14, and becomes a fiber package 15.

  The processing agent for synthetic fibers of the present invention can be used as a processing agent for industrial materials.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to this. In addition, the numerical value in a table | surface represents a weight part.

<Example 1>
Polyester (B-1) of 10.0 parts by weight of 2,4-bis (n-dodecylthiomethyl) -6-methylphenol (A-1), hydrogenated castor oil EO 30 mol adduct, phthalic anhydride and stearic acid 30.0 parts by weight, diester (C-1) of trimethylolpropane EO 20 mol adduct and myristic acid 3.0 parts by weight, diester of oleyl alcohol EO 5 mol adduct and thiodipropionic acid (D-1) 53 0.0 part by weight, tallow alkylamine EO 10 mol adduct (E-1) 2.0 parts by weight, polydimethylsiloxane [viscosity 20 mm 2 / s (25 ° C.)] (E-2) 1.0 part by weight, dodecenyl succinic acid A treating agent of Example 1 was prepared by adding 1.0 part by weight of a 30 wt% sodium salt aqueous solution (E-4).

<Examples 2-6 and Comparative Examples 1-6>
Each component was mix | blended like Example 1 except having mix | blended with the weight part of Table 1 and Table 2, and the processing agent of Examples 2-6 and Comparative Examples 1-6 was prepared.

In addition, each component in Table 1 and Table 2 is as follows.
(A-1): 2,4-bis (n-dodecylthiomethyl) -6-methylphenol (A-2): 2,4-bis (n-hexadecylthiomethyl) -6-methylphenol (A- 3): 2,4-bis (n-octadecylthiomethyl) -6-methylphenol (B-1): Polyester of hydrogenated castor oil EO 30 mol adduct, phthalic anhydride and stearic acid (B-2): castor Polyester of oil EO 20 mol adduct, sebacic acid and palmitic acid (C-1): Trimethylolpropane EO 20 mol adduct and myristic acid diester (C-2): PO10 mol 2-ethylhexanol PO15 mol EO 15 mol block Adduct (C-3): Castor oil EO 15 mol adduct (D-1): Trimethylolpropane EO 30 mol adduct and lauric acid triester D-2): Diester of oleyl alcohol EO 5 mol adduct and thiodipropionic acid (D-3): Diester of lauryl alcohol EO 10 mol adduct and adipic acid (D-4): 2-decylpentadecanol Diester with thiodipropionic acid (E-1): EO 10 mol adduct of tallow alkylamine (E-2): polydimethylsiloxane [viscosity 20 mm ² / s (25 ° C.)]
(E-3): Triethylene glycol-bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate]
(E-4): 30% by weight aqueous solution of sodium dodecenyl succinate

<Example 1-5 and Comparative Example 1-5>
The treating agents of Examples 1 to 5 and Comparative Examples 1 to 5 were evaluated as follows.
A polyamide 66 chip obtained by liquid phase polymerization was added and mixed with a 5 wt% aqueous solution of copper acetate as an antioxidant, and 68 ppm of copper was added and adsorbed to the polymer weight. Next, a 50 wt% aqueous solution of potassium iodide and a 20 wt% aqueous solution of potassium bromide were added and adsorbed to 100 parts by weight of the polymer chip to 0.1 parts by weight as potassium, respectively, and solidified using a solid phase polymerization apparatus. Phase-polymerization was performed to obtain polyamide 66 pellets having a relative sulfuric acid relative viscosity of 3.8.
The above-mentioned polyamide chip was supplied to the extruder, and the discharge amount was adjusted by a metering pump so that the total fineness was 470 dtex. The spinning temperature was 293 ° C., and the mixture was filtered through a metal nonwoven fabric filter having a roughness of 20 μm in a spinning pack, and then spun through a mouthpiece having a pore number of 72. The spun yarn was passed through a slow cooling tube heated to a temperature of 250 ° C., cooled and solidified with cold air of 20 ° C. with a wind speed of 40 m / min, and taken up at 930 m / min with a take-up roll. Then, the processing agent which consists of a composition of Table 1 and Table 2 was diluted with mineral oil, and it oiled so that it might become the adhesion amount of Table 3, 4 and 5. The taken-up yarn is stretched 5% between the take-up roller and the yarn feeding roller without being wound once, and then the rotational speed ratio between the rollers is changed between the yarn feeding roller and the first drawing roller. The first-stage stretching was performed so as to be 3, followed by the second-stage stretching between the first stretching roller and the second stretching roller. Subsequently, 7% relaxation heat treatment was performed between the second stretching roller and the relaxation roller, the yarn was entangled with the entanglement imparting device, and then wound with a winder. At this time, the total draw ratio represented by the take-off speed and the draw speed ratio was adjusted to 4.3 times. The surface temperature of each roller was set so that the take-up roller was at room temperature, the yarn feeding roller 40 ° C., the first stretching roller 130 ° C., the second stretching roller 235 ° C., and the relaxation roller 150 ° C. The entanglement process was performed by injecting high-pressure air from the direction perpendicular to the running yarn in the entanglement imparting device. A guide for regulating the running yarn was provided before and after the entanglement imparting device, and the pressure of the air to be injected was constant at 0.4 MPa.

<Example 6 and Comparative Example 6>
The treating agents of Example 6 and Comparative Example 6 were evaluated as follows.
Example 1 except that the total fineness was 175 dtex, the wind speed of the cold air was 30 m / min, the take-up speed was 790 m / min, the overall draw ratio was 4.6 times, and the pressure of the entanglement imparting device was 0.25 MPa. I followed.

In addition, the measuring method of each measured value in an Example is as follows.
<Total fineness>
According to JIS L1013 (1999) 8.3.1 A method, the positive fineness was measured at a predetermined load of 0.045 cN / Dtex to obtain the total fineness.

<Number of single fibers>
It was calculated by the method of JIS L1013 (1999) 8.4.

<Single fiber fineness>
The total fineness was calculated by dividing by the number of single fibers.

<Strength / Elongation>
JIS L1013 (1999) 8.5.1 Measurement was performed under constant speed extension conditions shown in the standard time test. The sample was “TENSILON” UCT-100 manufactured by Orientec Co., Ltd., and the gripping interval was 25 cm and the pulling speed was 30 cm / min. In addition, elongation was calculated | required from elongation of the point which showed the maximum strength in a SS curve.

<Number of yarn fluff>
The obtained test yarn was rewound at a speed of 500 m / min. A laser fluff detector “Flytech V” manufactured by Heberline Co. was installed at a position 2 m away from the test yarn being rewound, and the total number of fluff detected was 1,000,000. Displayed in terms of number per m.
Since the absolute number of fluff varies depending on the single yarn fineness and the overall draw ratio, the judgment criteria were set as follows for each variety.
[Criteria]
Fineness: 470 dtex Number of single yarns: 72 ○: The total number of fluff is 0-3.0 pieces / million m
Δ: The total number of fluff is 3.1-6.0 pieces / million m
X: The total number of fluff is 6.1 or more / 1 million m
Fineness: 175 dtex Number of single yarns: 72 Yes: Total number of fluff is 0-9 / 1,000,000m
Δ: The total number of fluff is 9.1-15 / million
X: The total number of fluff is 15.1 or more / million m

<Thixotropic index>
The thixotropy index in the present invention refers to a thixotropy index measured under the following measurement conditions using a rheometer AR2000 manufactured by TA Instruments Japan Co., Ltd. After depositing the sample into a parallel plate shear rate ^{0.01~0.1 (s -1), 0.1~1 (} s -1), 1~10 (s -1) and 10 to 100 (s ^-1 )) Viscosity measurement at 75 ° C. was performed at 10 points. The thixotropy index was calculated from the viscosity ratio represented by the following formula (2), with the viscosity of 0.1 (s ⁻¹ ) and the viscosity of 1 (s ⁻¹ ) obtained under the above measurement conditions. The thixotropy index of the synthetic fiber treatment agent of the present invention was an average value of two trials.
Thixotropic index = η (0.1 s ⁻¹ ) / η (1 s ⁻¹ ) (2)
η (0.1 s ⁻¹ ): viscosity at a measurement temperature of 75 ° C. and a shear rate of 0.1 (s ⁻¹ ) η (1 s ⁻¹ ): viscosity at a measurement temperature of 75 ° C. and a shear rate of 1 (s ⁻¹ )

<High-temperature friction coefficient against metal>
The low coefficient of friction against metal in the present invention refers to a yarn to which a treating agent is applied at a yarn speed of 0.2 m / min, an initial tension of 900 g, using a friction tester YF850 manufactured by Toray Engineering Co., Ltd. The coefficient of friction is calculated from the following formula (3) from the tension after contact with a fixed metal pin (surface Cr matte plating) friction body at 540 ° C at 230 ° C. Refers to the coefficient of friction. The test yarn was a Toray 66 nylon yarn (470T-72-1781) washed with hot water, and the amount of the treatment agent composed of the compositions shown in Tables 1 and 2 was 1.0 weight based on the weight of the synthetic fiber. % Was used as a test yarn.
(Coefficient of high-temperature friction against metal) = (Measurement tension) / (Initial tension + Measurement tension) (3)

The method for measuring the amount of attached oil is as follows.
The diethyl ether extract was measured by the method of JIS L1013 (1999) 8.27 b) and used as the amount of adhered oil. The total amount of attached oil was measured from the wound drawn yarn.
Oil adhesion amount: Measured by hexane extraction method of JIS L1096, oil adhesion amount was determined.

  As is apparent from Tables 3 and 4, the treating agents for synthetic fibers of the present invention (Examples 1 to 5) were treated with a thixotropy index of the treating agent and a high-temperature low-temperature friction coefficient against metal at 230 ° C. measured by a friction tester. It can be seen that it is excellent in controlling fluff generation during stretching by controlling the. On the other hand, Comparative Examples 1 to 5 do not satisfy all the performance items. As is apparent from Table 5, the treatment agent for the synthetic fiber of the present invention (Example 6) has a high draw ratio and high speed yarn production because the treatment agent necessary for increasing the spinning / drawing speed is excellent in following the yarn. It is possible to provide a high-quality synthetic fiber under conditions. On the other hand, Comparative Example 6 does not satisfy all the performance items.

1: Spinneret
2: Heating cylinder 3: Cross flow cooling device 4: Cooling air 5: Yarn 6: Duct 7: Oil supply device 8: Take-up roller 9: Yarn supply roller 10: First drawing roller 11: Second drawing roller 12: Relaxing roller 13: Entangling device 14: Winder 15: Fiber package

The treatment agent for synthetic fibers of the present invention is particularly straight due to the superiority in suppressing the occurrence of yarn breakage and fluff during stretching by enhancing the heat stretchability and heat treatment properties in the synthetic fiber manufacturing process and enhancing the extreme pressure. It can be suitably used for spinning and drawing processes of nylon fibers for oil-feeding airbags.

Claims (5)

  A synthetic fiber treatment agent comprising the thixotropic property-imparting agent (A) and the extreme pressure agent (B) as essential components, wherein the thixotropy index at 75 ° C. measured by a rheometer of the synthetic fiber treatment agent is 1.4 to A treating agent for synthetic fibers, which is 3.0 and has a high-temperature, low-temperature friction coefficient against metal at 230 ° C. measured by a friction tester of 0.250 to 0.344. The processing agent for synthetic fibers according to claim 1, wherein the thixotropic agent (A) is a compound represented by the following general formula (1).
[Wherein, R represents an alkyl group having 8 to 18 carbon atoms. ]   The extreme pressure agent (B) is an ester of an alkylene oxide adduct of vegetable oil and one or more acids selected from the group consisting of monovalent fatty acids, dibasic acids and dibasic acid anhydrides. 2. The processing agent for synthetic fibers according to 2. Furthermore, a synthetic fiber treatment agent comprising an emulsifier (C) and a smoothing agent (D),
The emulsifier (C) is one or more emulsifiers (C) selected from the group consisting of a monohydric alcohol type nonionic active agent (C1) and a polyhydric alcohol type nonionic active agent (C2),
The smoothing agent (D) is an ester (D1) of an alkylene oxide adduct of a monohydric alcohol and a divalent fatty acid or a sulfur-containing divalent fatty acid, an ester (D2) of an alkylene oxide adduct of a polyhydric alcohol and a monovalent fatty acid. ), Animal and vegetable oil (D3), ester (D4) of monohydric alcohol and monovalent fatty acid (D4), ester (D5) of monohydric alcohol and divalent fatty acid or sulfur-containing divalent fatty acid, polyhydric alcohol and monovalent fatty acid, The processing agent for synthetic fibers according to any one of claims 1 to 3, which is one or more smoothing agents (D) selected from the group consisting of esters (D6).   The content of the thixotropic agent (A) in the synthetic fiber treatment agent is 8 to 25% by weight based on the weight of the synthetic fiber treatment agent, and the extreme pressure agent (B) content is synthetic fiber. 20 to 40% by weight based on the weight of the treating agent, the content of the emulsifier (C) is 2 to 17% by weight based on the weight of the synthetic fiber treating agent, and the content of the smoothing agent (D) The processing agent for synthetic fibers according to any one of claims 1 to 4, wherein the rate is 18 to 70% by weight based on the weight of the processing agent for synthetic fibers.