JP4386963B2 - Synthetic fiber treatment agent and method for producing synthetic fiber using the same - Google Patents

Description

  The present invention relates to a treating agent for synthetic fibers and a method for producing synthetic fibers using the same. More specifically, the present invention relates to a synthetic fiber treating agent that can be attached to a raw synthetic fiber without heating and a synthetic fiber manufacturing method using the same.

In recent years, with the speeding up and the high temperature of the spinning process and processing process of synthetic fibers, the problem of fluff and yarn breakage is increasing. In particular, synthetic fibers for use in industrial materials such as tire cords and seat belts are exposed to severe conditions of high temperature and high contact pressure in the yarn production process, and therefore, the problem of fluff and thread breakage of the synthetic fibers is likely to occur. Therefore, it is important to suppress the occurrence of fluff and yarn breakage. For this purpose, the synthetic fiber treatment agent to be processed on the synthetic fiber in the yarn making process has sufficient lubrication that does not cause fuzz or yarn breakage in the synthetic fiber even under severe conditions of high temperature and high contact pressure. It is required to be able to impart sex. Moreover, even if sufficient lubricity can be imparted, the heat resistance at high temperatures is inferior, and if the treating agent for synthetic fibers becomes tar, the occurrence of fluff and yarn breakage cannot be suppressed. Furthermore, in applications that require a dyeing process such as a seat belt, good dyeability is also required.
Conventionally, as a solution to the problem of fluff and yarn breakage under severe conditions of high temperature and high contact pressure, a treatment agent comprising a polyether polyester block copolymer (Patent Document 1), comprising an organic phosphorous oxide of polyester A treating agent (Patent Document 2), a treating agent comprising a condensation product of an aliphatic nitrogen-containing alkanol compound and a polyether polyester block copolymer (Patent Document 3), a treating agent containing a trioxyalkyl phosphate ester (Patent Document 4) ), A treating agent containing a specific sulfur compound (Patent Document 5), a treating agent containing a compound obtained by connecting polyoxyalkylenated hydrogenated castor oil and a polyether with a dicarboxylic acid (Patent Document 6), and the like have been proposed. ing.

However, these conventional treatment agents have a problem that they cannot satisfy the high lubricity required in recent years. Moreover, in the processing agent etc. of patent documents 1-3, since it requires heating to 40-80 degreeC, when giving to the said fiber, it is a problem that it cannot adapt to various processes. There is.
Japanese Patent No. 3746128 Japanese Patent No. 3625351 Japanese Patent No. 3871289 JP-A-2005-42207 Japanese Patent Laid-Open No. 2005-42208 JP 2006-307352 A

  The problem to be solved by the present invention is to provide a treatment agent for synthetic fibers that prevents fluff and yarn breakage and does not require heating during use, and a method for producing synthetic fibers using the same.

The block copolymer disclosed in Patent Document 1 has a structure in which an oxyalkylene structural unit is added in a block form to a polyhydric alcohol, and a lactone structural unit is further added in a block form to the obtained block-like adduct. Have The present inventors obtained the knowledge that the melting point of the copolymer changes depending on the addition type of the structural unit, and has a great effect on the improvement of fluff and thread breakage. The inventors have found that the above-mentioned problems can be solved when the number is random, and have reached the present invention.
Therefore, the treating agent for synthetic fibers according to the present invention is represented by the following general formula (1), an ester component, a nonionic surfactant, an anionic surfactant essentially comprising an organic phosphate ester salt, A polyester ether compound having a melting point of 40 ° C. or less, and the weight ratio of each component in the active component comprising the ester component, the nonionic surfactant, the anionic surfactant and the polyester ether compound is 75% by weight, nonionic surfactant 20 to 70% by weight, anionic surfactant 0.1 to 6% by weight, and polyester ether compound 1 to 20% by weight.

(However, R ¹ is a residue obtained by removing n hydroxyl groups from alcohol having n hydroxyl groups in the molecule; R ² is independently an alkylene group having 2 to 5 carbon atoms; R ³ is independently R ⁴ is a hydrogen atom, a residue obtained by removing an OH group from a carboxyl group of a monovalent carboxylic acid having 2 to 24 carbon atoms, or a divalent group having 2 to 18 carbon atoms. It is obtained by adding a residue obtained by removing an OH group from a carboxyl group of a carboxylic acid, a residue obtained by removing an OH group from a carboxyl group of a trivalent carboxylic acid having 6 to 18 carbon atoms, and an alkylene oxide having 2 to 4 carbon atoms. At least one selected from the group; n is an integer of 1 to 6; x and y are each independently an integer of 5 to 100; and a lactone structural unit represented by the following general formula (2): A, an oxyalkylene structure represented by the following general formula (3) When the unit is B, the portion represented by A _x · B _y in the general formula (1) forms a random copolymer chain composed of A and B; R ⁴ is derived from a carboxyl group of a divalent carboxylic acid. In the case of the residue excluding the OH group or the residue obtained by removing the OH group from the carboxyl group of the trivalent carboxylic acid, the entire polyester ether compound contains a plurality of R ¹ by bonding with B of the polyester ether compound between molecules. It may be a thing.)

In the synthetic fiber treating agent of the present invention, any of the following (1) to (3) is preferable.
(1) The weight ratio of the organic phosphate ester salt is 0.1 to 3% by weight with respect to the active ingredient.
(2) The solidification start temperature is 15 ° C. or lower.
(3) Further containing a solvent.
The method for producing a synthetic fiber according to the present invention includes a step of adhering the treatment agent for synthetic fiber to the raw synthetic fiber, and the adhesion ratio of the active ingredient is 0.2 to 3% by weight of the raw synthetic fiber.

  In the method for producing a synthetic fiber of the present invention, it is preferable that the strength of the synthetic fiber is 7.0 cN / dt or more and / or that the synthetic fiber is a synthetic fiber for industrial materials.

  Since the treatment agent for synthetic fibers of the present invention contains a polyester ether compound having a melting point of 40 ° C. or less, heating during use is unnecessary, and when attached to raw synthetic fibers, fluff and yarn breakage are prevented. be able to.

  The synthetic fiber manufacturing method of the present invention uses a synthetic fiber treating agent containing a polyester ether compound having a melting point of 40 ° C. or lower, so that heating is not required when adhering to the raw synthetic fiber, and fluff and yarn breakage are prevented. be able to.

[Treatment agent for synthetic fibers]
The treatment agent for synthetic fibers of the present invention contains an ester component, a nonionic surfactant, an anionic surfactant essentially containing an organic phosphate ester salt, and a polyester ether compound. Hereinafter, each component will be described in detail. In the following description, four components comprising an ester component, a nonionic surfactant, an anionic surfactant, and a polyester ether compound are referred to as active ingredients.

(Ester component)
In the treating agent for synthetic fibers of the present invention, the ester component is a main component that imparts lubricity to the synthetic fiber, and improves the smoothness when contacting the friction body at high speed and prevents fluff. It is a component which improves the yarn-making property. Moreover, it is a component which improves high-order processing process permeability, such as twisting, warping, and weaving.
Although there is no limitation in particular about carbon number of an ester component, Preferably it is 16-100, More preferably, it is 30-80, More preferably, it is 36-60. When the ester component has less than 16 carbon atoms, the lubricity to be imparted to the synthetic fiber is insufficient, the smoothness is not sufficient, and fluff may not be prevented. On the other hand, when the carbon number of the ester component is more than 100, the melting point of the ester component becomes high, and the solidification start temperature of the synthetic fiber treatment agent may exceed 15 ° C.

Specific examples of the ester component include those shown in the following (A1) to (A6).
(A1) Monovalent ester synthesized by ester reaction of a monovalent aliphatic alcohol and a monovalent fatty acid The carbon number of the monovalent aliphatic alcohol is not particularly limited, but is preferably 8-24. Preferably it is 12-22, More preferably, it is 16-20.
Although there is no limitation in particular about carbon number of monovalent fatty acid, Preferably it is 8-24, More preferably, it is 12-22, More preferably, it is 16-20.

Although there is no limitation in particular about the weight average molecular weight of monovalent ester, Preferably it is 190-700, More preferably, it is 270-660, More preferably, it is 360-620.
Specific examples of monovalent esters include, for example, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, lauryl oleate, tridecyl stearate, oleyl oleate, octyl decyl oleate, oleate of C16 branched alcohol, and C16 branched alcohol. Examples include stearate, oleate of C20 branched alcohol, stearate of C20 branched alcohol, oleate of C24 branched alcohol, stearate of C24 branched alcohol, and the like.

(A2) An ether ester synthesized by an ester reaction of a monovalent aliphatic alcohol having a (poly) oxyalkylene group bonded thereto and a monovalent fatty acid. In the monovalent aliphatic alcohol having a (poly) oxyalkylene group bonded thereto, Although there is no limitation in particular about carbon number of an aliphatic group, Preferably it is 8-24, More preferably, it is 12-22, More preferably, it is 16-20.

Examples of the alkylene oxide used for forming the (poly) oxyalkylene group include ethylene oxide and propylene oxide, and any of ethylene oxide alone, propylene oxide alone, and a combination of ethylene oxide and propylene oxide may be used.
Although there is no limitation in particular about the average addition mole number of the alkylene oxide which comprises 1 mol of (poly) oxyalkylene groups, Preferably it is 1-15 mol, More preferably, it is 3-12 mol, More preferably, it is 5-8 mol. is there.

  Although there is no limitation in particular about carbon number of monovalent fatty acid, Preferably it is 8-24, More preferably, it is 12-22, More preferably, it is 16-20.

Although there is no limitation in particular about the weight average molecular weight of ether ester, Preferably it is 270-1570, More preferably, it is 430-1400, More preferably, it is 600-1200.
Specific examples of ether esters include, for example, octyloxyalkenyl octanate, octyloxyalkenyl decanate, octyloxyalkenyl laurate, decyloxyalkenyl octanate, decyloxyalkenyl decanate, decyloxyalkenyl laurate, lauryloxyalkenyl octanate , Ether esters such as lauryloxyalkenyl decanate and lauryloxyalkenyl laurate.

(A3) Both end diesters of polyethylene glycol synthesized by ester reaction of polyethylene glycol (hereinafter referred to as PEG) and monovalent fatty acid (hereinafter referred to as PEG diester)
Although there is no limitation in particular about the weight average molecular weight of PEG, 200-600 are preferable.
Although there is no limitation in particular about carbon number of monovalent fatty acid, Preferably it is 4-24, More preferably, it is 12-22, More preferably, it is 16-20.
Although there is no limitation in particular about the weight average molecular weight of PEG diester, Preferably it is 400-1300, More preferably, it is 480-1200, More preferably, it is 560-1100.

  Specific examples of the PEG diester include, for example, dilaurate of PEG having a weight average molecular weight of 200 (indicated by PEG weight average molecular weight in parentheses and described as “PEG (200) dilaurate”, the same applies hereinafter), PEG (300) Dilaurate, PEG (400) dilaurate, PEG (600) dilaurate, PEG (200) geolate, PEG (300) geolate, PEG (400) geolate, PEG (600) geolate, PEG (200) diisostearate, PEG (300 ) Diisostearate, PEG (400) diisostearate, PEG (600) diisostearate and the like.

(A4) Divalent ester synthesized by ester reaction of monovalent aliphatic alcohol and divalent fatty acid, or ester reaction of divalent aliphatic alcohol and monovalent fatty acid Carbon of monovalent aliphatic alcohol Although there is no limitation in particular about a number, Preferably it is 8-24, More preferably, it is 12-22, More preferably, it is 16-20.
Although there is no limitation in particular about carbon number of a bivalent fatty acid, Preferably it is 2-10, More preferably, it is 4-8. Further, a thiodialkylene acid having a sulfur atom in the molecule can also be used.

Although there is no limitation in particular about carbon number of a bivalent aliphatic alcohol, Preferably it is 2-10, More preferably, it is 4-8.
Although there is no limitation in particular about carbon number of monovalent fatty acid, Preferably it is 8-24, More preferably, it is 12-22, More preferably, it is 16-20.

Although there is no limitation in particular about the weight average molecular weight of bivalent ester, Preferably it is 310-880, More preferably, it is 400-800, More preferably, it is 500-700.
Specific examples of the divalent ester include, for example, 1,4-butyl dilaurate, 1,4-butyl dioleate, 1,4-butyl diisostearate, 1,6-hexyl dilaurate, 1,6-hexyl dioleate. 1,6-hexyl diisostearate, dilauryl adipate, dioleyl adipate, diisostearyl adipate, diC16 branched alcohol adipate, C20 branched alcohol adipate, C24 branched alcohol adipate, dioleylthiodipropionate, Examples include di-C16 branched alcohol thiodipropionate, C20 branched alcohol thiodipropionate, and C24 branched alcohol thiodipropionate.

(A5) A trivalent or tetravalent ester synthesized by an ester reaction of a monovalent fatty acid and a trivalent or tetravalent aliphatic alcohol, or an ester reaction of a monovalent aliphatic alcohol and a trivalent or tetravalent fatty acid. Although there is no limitation in particular about carbon number of the fatty acid of this, Preferably it is 8-24, More preferably, it is 12-22, More preferably, it is 16-20.
Although there is no limitation in particular about carbon number of a 3-4 valent aliphatic alcohol, Preferably it is 4-10.

Although there is no limitation in particular about carbon number of monovalent | monohydric aliphatic alcohol, Preferably it is 8-24, More preferably, it is 12-22, More preferably, it is 16-20.
The carbon number of the tri- to tetravalent fatty acid is not particularly limited, but is preferably 3 to 10.

Although there is no limitation in particular about the weight average molecular weight of 3-4 valent ester, Preferably it is 420-1500, More preferably, it is 500-1300, More preferably, it is 600-1100.
Specific examples of the trivalent to tetravalent fatty acids include, for example, glycerin trioctanoate, glycerin tridecanate, glycerin trioleate, glycerin triisostearate, trimethylolpropane trioctanoate, trimethylolpropane tridecanate, and trimethylol. Propanetrilaurate, trimethylolpropane trioleate, trimethylolpropane triisostearate, trioctyl trimellitate, tridecyl trimellitate, trilauryl trimellitate, triisostearyl trimellitate, pentaerythritol tetraoctanoate, Examples thereof include trivalent and tetravalent esters such as pentaerythritol tetradecanate.

(A6) Fats and oils obtained from naturally occurring animals and plants Examples of oils and fats obtained from naturally occurring animals and plants include soybean oil, coconut oil, linseed oil, cottonseed oil, rapeseed oil, castor oil, whale oil, and beef fat. Can be mentioned.

(Nonionic surfactant)
The nonionic surfactant is a component that functions as an emulsifier in the synthetic fiber treatment agent of the present invention and maintains good dispersion stability of the synthetic fiber treatment agent of the present invention. The nonionic surfactant is a component that improves adhesion in tire cords and the like and improves dyeability in seat belts and the like in the synthetic fibers for industrial materials obtained by using the synthetic fiber treating agent of the present invention. .
Although there is no limitation in particular about the weight average molecular weight of nonionic surfactant, Preferably it is 250-4000, More preferably, it is 600-3000, More preferably, it is 1000-2000. When the weight average molecular weight of the nonionic surfactant is less than 250, the dispersion stability of the synthetic fiber treating agent may be lowered. On the other hand, when the weight-average molecular weight of the nonionic surfactant is more than 4000, the dispersion stability of the synthetic fiber treatment agent may decrease, or the solidification start temperature of the synthetic fiber treatment agent may exceed 15 ° C. .
Specific examples of the nonionic surfactant include the following (B1) to (B10).

(B1) Sorbitan ester synthesized by ester reaction from sorbitan and monovalent fatty acid The carbon number of the monovalent fatty acid is not particularly limited, but is preferably 8 to 24, more preferably 10 to 20, and even more preferably. Is 12-18.
The reaction ratio of sorbitan and monovalent fatty acid is not particularly limited, but is preferably sorbitan / monovalent fatty acid = 1/1 to 1/3 (molar ratio).

Although there is no limitation in particular about the weight average molecular weight of sorbitan ester, Preferably it is 270-1180, More preferably, it is 340-1000, More preferably, it is 410-800.
Specific examples of sorbitan esters include, for example, sorbitan monolaurate, sorbitan monooleate, sorbitan monostearate, sorbitan monoisostearate, sorbitan trilaurate, sorbitan trioleate, sorbitan tristearate, sorbitan triisostearate, etc. Is mentioned.

(B2) A sorbitan ester bonded to a polyoxyethylene group obtained by polyoxyethylation of a sorbitan ester having a remaining hydroxyl group (hereinafter referred to as POE sorbitan ester).
Examples of the sorbitan ester having a remaining hydroxyl group include the sorbitan esters described in (B1) above.
Although there is no limitation in particular about the average addition mole number of ethylene oxide which comprises 1 mol of polyoxyethylene groups, Preferably it is 5-40 mol, More preferably, it is 10-35 mol, More preferably, it is 15-30 mol.

Although there is no limitation in particular about the weight average molecular weight of POE sorbitan ester, Preferably it is 490-2950, More preferably, it is 800-2500, More preferably, it is 1100-2000.
Specific examples of the POE sorbitan ester include, for example, POE sorbitan monolaurate, POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monoisostearate, POE sorbitan trilaurate, POE sorbitan trioleate, and POE sorbitan tristearate. Rate, POE sorbitan triisostearate and the like.

(B3) Castor oil bonded with polyoxyethylene groups obtained by polyoxyethylation of castor oil (hereinafter referred to as POE castor oil)
Although there is no limitation in particular about the average addition mole number of ethylene oxide which comprises 1 mol of polyoxyethylene groups, Preferably it is 5-50 mol, More preferably, it is 10-40 mol, More preferably, it is 15-30 mol.
Although there is no limitation in particular about the weight average molecular weight of POE castor oil, Preferably it is 1000-3000, More preferably, it is 1200-2600, More preferably, it is 1400-2200.

(B4) Castor oil ester (hereinafter referred to as POE castor oil ester) bonded with polyoxyethylene group, obtained by blocking the terminal hydroxyl group of polyoxyethylene group of POE castor oil with monovalent fatty acid by esterification reaction )
Examples of the POE castor oil include the POE castor oil described in (B3) above.
Although there is no limitation in particular about carbon number of monovalent fatty acid, Preferably it is 8-24, More preferably, it is 10-20, More preferably, it is 12-18.

The reaction ratio between the POE castor oil and the monovalent fatty acid is not particularly limited, but is preferably POE castor oil / monovalent fatty acid = 1/1 to 1/3 (molar ratio).
Although there is no limitation in particular about the weight average molecular weight of POE castor oil ester, Preferably it is 1100-4000, More preferably, it is 1400-3500, More preferably, it is 1700-3000.

  Specific examples of POE castor oil ester include, for example, POE castor oil laurate, POE castor oil dilaurate, POE castor oil trilaurate ester, POE castor oil oleate, POE castor oil diolate, POE castor oil trioleate, POE castor oil steer Rate, POE castor oil distearate, POE castor oil tristearate, POE castor oil isostearate, POE castor oil diisostearate, POE castor oil triisostearate and the like.

(B5) Hardened castor oil bonded with polyoxyethylene groups obtained by polyoxyethylation of hardened castor oil (hereinafter referred to as POE hardened castor oil)
Although there is no limitation in particular about the average addition mole number of ethylene oxide which comprises 1 mol of polyoxyethylene groups, Preferably it is 5-30 mol, More preferably, it is 10-25 mol, More preferably, it is 15-20 mol.
Although there is no limitation in particular about the weight average molecular weight of POE hydrogenated castor oil, Preferably it is 1000-2200, More preferably, it is 1200-1900, More preferably, it is 1400-1700.

(B6) Cured castor oil ester bonded to polyoxyethylene groups obtained by blocking the terminal hydroxyl group of the polyoxyethylene group of the POE cured castor oil with a monovalent fatty acid by an esterification reaction (hereinafter referred to as POE cured) Castor oil ester)
Examples of the hardened POE castor oil include the POE hardened castor oil described in (B5) above.
Although there is no limitation in particular about carbon number of monovalent fatty acid, Preferably it is 8-24, More preferably, it is 10-20, More preferably, it is 12-18.
The reaction ratio between the POE hydrogenated castor oil and the monovalent fatty acid is not particularly limited, but is preferably POE hydrogenated castor oil / monovalent fatty acid = 1/1 to 1/3 (molar ratio).

Although there is no limitation in particular about the weight average molecular weight of POE hydrogenated castor oil ester, Preferably it is 1100-3200, More preferably, it is 1400-2900, More preferably, it is 1700-2600.
Specific examples of POE hydrogenated castor oil ester include, for example, POE hydrogenated castor oil laurate, POE hydrogenated castor oil dilaurate, POE hydrogenated castor oil trilaurate ester, POE hydrogenated castor oil oleate, POE hydrogenated castor oil geolate, POE hydrogenated castor oil Trioleate, POE hydrogenated castor oil stearate, POE hydrogenated castor oil distearate, POE hydrogenated castor oil tristearate, POE hydrogenated castor oil isostearate, POE hydrogenated castor oil diisostearate, POE hydrogenated castor oil triisostearate, etc. Is mentioned.

(B7) Alkyl ether bonded with polyoxyethylene group obtained by polyoxyethylation of monovalent aliphatic alcohol (hereinafter referred to as POE alkyl ether)
The carbon number of the monovalent aliphatic alcohol is not particularly limited, but is preferably 8 to 24, more preferably 10 to 20, and further preferably 12 to 18.
Although there is no limitation in particular about the average addition mole number of ethylene oxide which comprises 1 mol of polyoxyethylene groups, Preferably it is 3-20 mol, More preferably, it is 5-16 mol, More preferably, it is 8-12 mol.

Although there is no limitation in particular about the weight average molecular weight of POE alkyl ether, Preferably it is 240-1300, More preferably, it is 350-1000, More preferably, it is 450-700.
Specific examples of the POE alkyl ether include POE octyl ether, POE ethylhexyl ether, POE decyl ether, POE lauryl ether, POE oleyl ether, POE stearyl ether, POE isostearyl ether, and the like.

(B8) Polypropylene / polyethylene polyether (hereinafter referred to as PO / EO polyether) obtained by using aliphatic alcohol as a starting material and adding ethylene oxide or propylene oxide to the hydroxyl group in a random or block form
Although there is no limitation in particular about carbon number of an aliphatic alcohol, Preferably it is 2-60, More preferably, it is 4-30, More preferably, it is 12-20.
Examples of the aliphatic alcohol include butanol, hexyl alcohol, octyl alcohol, 2-ethylhexyl alcohol, decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, isocetyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, and C16 branched type. Alcohol, C20 branched alcohol, C24 branched alcohol, ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, glycerin, trimethylol Examples include propane, pentaerythritol, sorbitol, castor oil, hydrogenated castor oil, and the like.

The ratio of the number of moles of polypropylene and polyethylene added to the aliphatic alcohol (polypropylene / polyethylene) is not particularly limited, but is preferably 8/2 to 2/8, more preferably 7/3 to 3/7, Preferably, it is 6/4 to 4/6. The addition type of polypropylene / polyethylene may be either random or block, but is more preferably random.
Although there is no limitation in particular about the weight average molecular weight of PO / EO polyether, Preferably it is 250-4000, More preferably, it is 700-3000, More preferably, it is 1000-2000.

  Specific examples of the PO / EO polyether include, for example, PO / EO (2/8) octyl ether (weight average molecular weight: 300) (hereinafter, PO / EO followed by parentheses indicate the number of added moles of polypropylene / polyethylene). The ratio is shown.), PO / EO (5/5) octyl ether (weight average molecular weight: 300) (, PO / EO (8/2) octyl ether (weight average molecular weight: 300), PO / EO (2/8) ) Stearyl ether (weight average molecular weight: 1500), PO / EO (5/5) stearyl ether (weight average molecular weight: 1500), PO / EO (8/2) stearyl ether (weight average molecular weight: 1500), PO / EO (2/8) trimethylol ether (weight average molecular weight: 3500), PO / EO (5/5) trimethylol ether (weight average fraction) The amount: 3500), PO / EO (8/2) trimethylolpropane ether (weight average molecular weight: 3500), and the like.

(B9) One end ester of polyethylene glycol (hereinafter referred to as PEG ester) obtained by esterifying a part of hydroxyl groups of PEG by ester reaction between PEG and monovalent fatty acid
Although there is no limitation in particular about the weight average molecular weight of PEG, 200-600 are preferable.
Although there is no limitation in particular about carbon number of monovalent fatty acid, Preferably it is 4-24, More preferably, it is 12-22, More preferably, it is 16-20.
Although there is no limitation in particular about the weight average molecular weight of PEG ester, Preferably it is 300-1000, More preferably, it is 400-800, More preferably, it is 500-600.

  Specific examples of the PEG ester include, for example, PEG (200) laurate, PEG (300) laurate, PEG (400) laurate, PEG (600) laurate, PEG (200) oleate, PEG (300) oleate, PEG (400) Examples include oleate, PEG (600) oleate, PEG (200) isostearate, PEG (300) isostearate, PEG (400) isostearate, PEG (600) isostearate and the like.

(B10) (Poly) glycerin ester synthesized by esterifying some hydroxyl groups of (poly) glycerin by ester reaction between (poly) glycerin and a monovalent fatty acid. Although there is no limitation in particular about a number, Usually, 1-6 pieces, Preferably it is 1-4 pieces, More preferably, it is 2-3 pieces.
Although there is no limitation in particular about carbon number of monovalent fatty acid, Preferably it is 8-24, More preferably, it is 10-20, More preferably, it is 12-18.
Although there is no limitation in particular about the reaction ratio of polyglycerol and monovalent fatty acid with respect to the number of hydroxyl groups which polyglycerol has, Preferably it is 20 to 80%, More preferably, it is 30 to 70%, More preferably, it is 40 to 60 %.

Although there is no limitation in particular about the weight average molecular weight of (poly) glycerin ester, Preferably it is 200-2000, More preferably, it is 300-1500, More preferably, it is 400-1000.
Specific examples of the (poly) glycerol ester include, for example, monoglycerol monolaurate, monoglycerol monooleate, monoglycerol monostearate, monoglycerol monoisostearate, diglycerol monolaurate, diglycerol monooleate, and diglycerol. Examples include monostearate and diglycerin monoisostearate.

(Anionic surfactant)
The anionic surfactant essentially comprises an organic phosphate ester salt and further contains other anionic surfactant. An anionic surfactant is a component that generally acts as an antistatic agent, and is a component that improves smoothness (particularly metal-smoothness) and prevents fluff. In addition to acting as an antistatic agent, the organic phosphate ester salt also acts as an extreme pressure additive. The extreme pressure additive is an agent that functions to improve the oil film strength of the metal against the synthetic fiber for industrial materials obtained by using the synthetic fiber treating agent of the present invention.
Although there is no limitation in particular about the weight average molecular weight of organophosphate ester salt, Preferably it is 150-2500, More preferably, it is 250-2000, More preferably, it is 350-1500. If the weight average molecular weight of the organic phosphate ester salt is less than 150, smoothness (particularly metal smoothness) may be insufficient and fluff may not be prevented. On the other hand, if the weight average molecular weight of the organic phosphate ester salt exceeds 2500, the solidification start temperature of the synthetic fiber treatment agent may exceed 15 ° C.

  Examples of the organic phosphate salt include a monoaliphatic phosphate salt represented by the following general formula (4) and a dialiphatic phosphate salt represented by the general formula (5). It is usually a mixture of these.

(In the general formula (4) and the general formula (5), R ⁵ is an aliphatic group having 6 to 24 carbon atoms, and m = 0 to 20. M ⁺ is an alkali metal ion and / or an alkanolamine. And ammonium ions derived from amine compounds such as N-alkyl-substituted alkanolamines and polyoxyethylene alkylamino ethers.)
R ⁵ is an aliphatic group having 6 to 24 carbon atoms, and the carbon number is preferably 10 to 20, more preferably 12 to 18.

m is 0-20, preferably 0-15, more preferably 0-7. In general formula (5), m has two locations, but each may be the same or different.
M ⁺ is an alkali metal ion and / or an ammonium ion derived from an amine compound. Specific examples of the alkali metal ions include sodium ions and potassium ions. Specific examples of amine compounds in which M ⁺ is an ammonium ion include, for example, alkanolamines such as diethanolamine, triethanolamine, dibutylethanolamine, and diethylethanolamine; N-alkyl-substituted alkanolamines; POE laurylamine, POE oleylamine, and POE stearyl. Examples thereof include polyoxyethylene alkylamino ethers such as amines.

As M ⁺ , an ammonium ion derived from an N-alkyl-substituted alkanolamine, an ammonium ion derived from polyoxyethylene alkylamino ether, and the like are preferable, and an ammonium ion derived from polyoxyethylene alkylamino ether is more preferable.
Specific examples of the organic phosphate ester salt include, but are not limited to, lauryl phosphate sodium salt, cetyl phosphate sodium salt, oleyl phosphate sodium salt, lauryl phosphate potassium salt, cetyl phosphate potassium salt, oleyl phosphate potassium salt, POE lauryl phosphate Sodium salt, POE cetyl phosphate sodium salt, POE oleyl phosphate sodium salt, POE lauryl phosphate potassium salt, POE cetyl phosphate potassium salt, POE oleyl phosphate potassium salt, lauryl phosphate diethanolamine salt, cetyl phosphate diethanolamine salt, oleyl phosphate diethanolamine salt, POE lauryl Phosphate diethanolamine salt, POE cetylfo Fate diethanolamine salt, POE oleyl phosphate diethanolamine salt, lauryl phosphate POE laurylamine salt, cetyl phosphate POE laurylamine salt, oleyl phosphate POE laurylamine salt, POE lauryl phosphate POE laurylamine salt, POE cetyl phosphate POE laurylamine salt, POE oleyl phosphate POE laurylamine salt etc. are mentioned. In the above examples of the organic phosphate salts, for example, “lauryl phosphate sodium salt” is a generic term for “dilauryl phosphate sodium salt” and “lauryl phosphate disodium salt”, and other organic phosphate esters. The same shall apply to the description of the present specification including examples of salts.

Examples of other anionic surfactants other than the organic phosphate ester salts include organic carboxylates, organic sulfonates, and organic sulfate esters. Among these other anionic surfactants, organic carboxylates and organic sulfonates are preferable. In addition, the other anionic surfactant is preferably a sodium salt or a potassium salt.
Although there is no limitation in particular about the weight average molecular weight of other anionic surfactant, Preferably it is 180-400, More preferably, it is 210-370, More preferably, it is 240-340. When the weight average molecular weight of the other anionic surfactant component is less than 200 or more than 400, the compatibility with the synthetic fiber treatment agent deteriorates or the dispersion stability of the synthetic fiber treatment agent when blended is reduced. It may cause a decrease.

  Specific examples of other anionic surfactants include the following (D1) to (D2).

(D1) Sodium salt and potassium salt of organic carboxylic acid The fatty acid used in the sodium salt and potassium salt of organic carboxylic acid is preferably a fatty acid having 2 to 24 carbon atoms, more preferably a fatty acid having 4 to 22 carbon atoms, Preferably, a C10-20 fatty acid can be mentioned.
Although there is no limitation in particular about the weight average molecular weight of the sodium salt and potassium salt of organic carboxylic acid, Preferably it is 100-400, More preferably, it is 150-370, More preferably, it is 200-340.
Specific examples of sodium and potassium salts of organic carboxylic acids include, for example, sodium laurate, sodium myristic acid, sodium palmitate, sodium oleate, sodium stearate, sodium isostearate, potassium laurate Salts, potassium myristic acid, potassium palmitate, potassium oleate, potassium stearate, potassium isostearate and the like.

(D2) Sodium salt and potassium salt of organic sulfonic acid The weight average molecular weight of the sodium salt and potassium salt of organic sulfonic acid is not particularly limited, but is preferably 180 to 400, more preferably 210 to 370, and still more preferably 240. ~ 340.
Specific examples of the organic sulfonic acid sodium salt and potassium salt include, for example, alkylbenzene sulfonic acid sodium salt, alkylnaphthalene sulfonic acid sodium salt, alkane sulfonic acid sodium salt, dialkylsulfosuccinic acid sodium salt, alkylbenzene sulfonic acid potassium salt, alkyl naphthalene. Examples include sulfonic acid potassium salt, alkanesulfonic acid potassium salt, and dialkylsulfosuccinic acid potassium salt.

(Polyester ether compound)
The polyester ether compound is a compound represented by the general formula (1) and having a melting point of 40 ° C. or lower. The polyester ether compound, together with the ester component, is a component that imparts lubricity to the synthetic fiber in the synthetic fiber treatment agent of the present invention, improves smoothness when contacting the friction body at low speed, and prevents fluff. Work. The synthetic fiber treating agent of the present invention exhibits a high effect of preventing fluff and yarn breakage by simultaneously containing a polyester ether compound and an organic phosphate.
The melting point of the polyester ether compound is preferably 40 ° C. or lower, more preferably 30 ° C. or lower, and further preferably 20 ° C. or lower. When the melting point of the polyester ether compound exceeds 40 ° C., the treatment agent for synthetic fibers of the present invention is solidified, so that it is necessary to heat at the time of use, and handling properties and productivity are lowered.

Below, a polyester ether compound is demonstrated in detail based on General formula (1).
R ¹ is a residue obtained by removing n hydroxyl groups from an alcohol having n hydroxyl groups in the molecule. In the following description, an alcohol having n hydroxyl groups in its molecule may be referred to as “alcohol A” for simplicity.

Although there is no limitation in particular about carbon number of alcohol A, Preferably it is 1-60, More preferably, it is 8-32, More preferably, it is 16-24.
Although there is no limitation in particular about the weight average molecular weight of alcohol A, Preferably it is 30-900, More preferably, it is 100-500, More preferably, it is 200-350.

Specific examples of alcohol A include those shown in the following 1) to 4).
1) Monovalent aliphatic alcohol The carbon number of the monovalent aliphatic alcohol is not particularly limited, but is preferably 1 to 32, more preferably 8 to 28, and still more preferably 16 to 24.

Although there is no limitation in particular about the weight average molecular weight of monohydric aliphatic alcohol, Preferably it is 30-470, More preferably, it is 120-420, More preferably, it is 230-360.
Specific examples of the monohydric aliphatic alcohol include, for example, methanol, ethanol, propanol, butanol, hexyl alcohol, octyl alcohol, 2-ethylhexyl alcohol, decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, isocetyl alcohol, stearyl alcohol. , Isostearyl alcohol, oleyl alcohol, C16 branched alcohol, C20 branched alcohol, C24 branched alcohol and the like.

2) Dihydric alcohol The carbon number of the dihydric alcohol is not particularly limited, but is preferably 2 to 10, more preferably 4 to 8.
Although there is no limitation in particular about the weight average molecular weight of a bihydric alcohol, Preferably it is 60-180, More preferably, it is 90-150.

  Specific examples of the dihydric alcohol include ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, and the like.

3) 3-6 valent polyhydric alcohol Although there is no limitation in particular about carbon number of 3-6 valent polyhydric alcohol, Preferably it is C3-6.
Although there is no limitation in particular about the weight average molecular weight of a 3-6 valent polyhydric alcohol, Preferably it is 90-200.
Specific examples of the 3-6 valent polyhydric alcohol include glycerin, trimethylolpropane, pentaerythritol, sorbitol and the like.
4) Hydroxycarboxylic acid esters such as castor oil and hydrogenated castor oil

Next, R ² is independently an alkylene group having 2 to 5 carbon atoms, preferably a linear alkylene group having 2 to 5 carbon atoms.
In another expression, R ² can also be an alkylene group obtained by removing a COO group from a lactone having 3 to 6 carbon atoms. Specific examples of the lactone having 3 to 6 carbon atoms include β-propionlactone, γ-butyrolactone, δ-valerolactone, and ε-caprolactone, and ε-caprolactone is preferable.

Specific examples of R ² include 1,2-ethylene group (— (CH ₂ ) ₂ —), 1,3-propylene group (— (CH ₂ ) ₃ —), 1,4-butylene group (— (CH _{2) 4} -), 1,5-pentylene (- _{(CH 2) 5} -) can be exemplified, and 1,5-pentylene group.

Next, R ³ is independently an alkylene group having 2 to 4 carbon atoms, preferably an alkylene group having 2 to 3 carbon atoms, and more preferably a 1,2-alkylene group having 2 to 3 carbon atoms. .
Specific examples of R ³ include 1,2-ethylene group (— (CH ₂ ) ₂ —), 1,2-propylene group (—CH (CH ₃ ) CH ₂ —), 1,3-propylene group (— (CH ₂ ) ₃ —), 1,4-butylene group (— (CH ₂ ) ₄ —) and the like can be mentioned.

Next, R ⁴ is a hydrogen atom, a residue obtained by removing an OH group from a carboxyl group of a monovalent carboxylic acid having 2 to 24 carbon atoms, and an OH group removed from a carboxyl group of a divalent carboxylic acid having 2 to 18 carbon atoms. A residue obtained by removing an OH group from a carboxyl group of a trivalent carboxylic acid having 6 to 18 carbon atoms and a group obtained by adding an alkylene oxide having 2 to 4 carbon atoms. .

In R ^4, the carbon number of the monocarboxylic acid is preferably 2 to 24, more preferably 8 to 20, more preferably from 12 to 18.
In R ⁴ , the weight average molecular weight of the monovalent carboxylic acid is not particularly limited, but is preferably 40 to 360, more preferably 100 to 300, and further preferably 150 to 250.
Specific examples of the monovalent carboxylic acid having 2 to 24 carbon atoms in R ⁴ include caprylic acid, 2-ethylhexylic acid, capric acid, lauric acid, myristic acid, palmitic acid, isopalmitic acid, stearic acid, and isostearic acid. And monovalent aliphatic carboxylic acids such as acid and oleic acid; monovalent aromatic carboxylic acids such as benzoic acid and the like.

In R ⁴ , the carbon number of the divalent carboxylic acid is preferably 2 to 18, more preferably 4 to 12, still more preferably 4 to 8, and particularly preferably 4 to 6.
Specific examples of the divalent carboxylic acid having 2 to 8 carbon atoms in R ⁴ include 2 such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, fumaric acid, maleic acid, thiodipropionic acid, and the like. And divalent aromatic carboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid and naphthalenedicarboxylic acid. Among these divalent carboxylic acids, adipic acid, fumaric acid, maleic acid, phthalic acid, isophthalic acid, terephthalic acid and the like are preferable, and adipic acid, maleic acid, isophthalic acid, terephthalic acid and the like are more preferable.

In R ⁴ , the carbon number of the trivalent carboxylic acid is preferably 6 to 18, more preferably 6 to 12, and still more preferably 6 to 9.
Specific examples of the trivalent carboxylic acid having 6 to 18 carbon atoms in R ⁴ include citric acid and trimellitic acid. Of these trivalent carboxylic acids, trimellitic acid is preferable.

R ⁴ may be a group obtained by addition of an alkylene oxide having 2 to ⁴ carbon atoms. Examples of the alkylene oxide include ethylene oxide, propylene oxide, butylene oxide and the like. The alkylene oxide may be composed of one kind or two or more kinds. The alkylene oxide is preferably ethylene oxide, propylene oxide, more preferably ethylene oxide.
In R ⁴ , the weight average molecular weight of the group obtained by addition of alkylene oxide is not particularly limited, but is preferably 100 to 1000, more preferably 300 to 800.

n is an integer of 1-6, Preferably it is an integer of 1-3, More preferably, it is an integer of 1-2.
x and y are each independently an integer of 5 to 100, preferably an integer of 10 to 80, and more preferably an integer of 20 to 60.
The ratio of x to y (x / y) is not particularly limited, but in the synthetic fiber treating agent of the present invention, it is 4/1 to 1/20 because of its good oil film strength and dispersion stability. And preferably 2/1 to 1/10. When x / y is larger than 4/1, the ratio of the lactone structural unit described later increases, the melting point of the polyester polyether compound exceeds 40 ° C., and the synthetic fiber treating agent of the present invention is imparted to the raw synthetic fiber. In some cases, heating is required. On the other hand, if x / y is less than 1/20, the oil film strength of the synthetic fiber treatment agent of the present invention is insufficient, and excellent yarn-making properties cannot be obtained when the synthetic fiber treatment agent of the present invention is used. Sometimes.

When the lactone structural unit represented by the general formula (2) is A and the oxyalkylene structural unit represented by the general formula (3) is B, the portion represented by A _x · B _y in the general formula (1) is A And a random copolymer chain consisting of B is formed. Here, in the case where the portion represented by A _x · B _y in the general formula (1) is not a random copolymer chain but a block copolymer chain, the melting point of the polyester ether compound is increased, and heating during use is essential. It becomes. In addition, fluff and thread breakage are reduced.

When R ⁴ is a residue obtained by removing an OH group from a carboxyl group of a divalent carboxylic acid or a residue obtained by removing an OH group from a carboxyl group of a trivalent carboxylic acid, it binds to B of the polyester ether compound between molecules. The entire polyester ether compound may contain a plurality of R ¹ .

  Although there is no limitation in particular about the weight average molecular weight of a polyester polyether compound, 1000-10000 are preferable and 2000-6000 are more preferable. When the weight average molecular weight of the polyester polyether compound is less than 1000, the oil film strength of the synthetic fiber treating agent of the present invention may be insufficient, and an excellent yarn forming property may not be obtained. On the other hand, when the weight average molecular weight of the polyester polyether compound is more than 10,000, the viscosity of the synthetic fiber treating agent of the present invention may increase, and the yarn-forming property may decrease due to an increase in friction.

  Although there is no limitation in particular about the manufacturing method of a polyester ether compound, For example, it is random of a C2-C4 alkylene oxide and a C3-C6 cyclic ester compound using a 1-6 valent aliphatic alcohol compound as a starting material. Manufactured by copolymerization. Furthermore, the terminal hydroxyl group of the obtained random copolymer may be esterified with a monovalent carboxylic acid having 1 to 24 carbon atoms, a divalent carboxylic acid having 2 to 8 carbon atoms, or the like. A polyester ether compound may be produced by adding an alkylene oxide and introducing a (poly) oxyalkylene chain.

(Combination ratio of active ingredients)
The treatment agent for synthetic fibers of the present invention contains the above active ingredient.
The weight ratio of the ester component to the active ingredient is 25 to 75% by weight, preferably 30 to 70% by weight, and more preferably 35 to 65% by weight. When the weight ratio of the ester component is less than 25% by weight, the friction is high and the spinning property is lowered, and the occurrence of fluff may increase. Furthermore, even in high-order processing processes such as twisting, warping, and weaving, damage to the raw synthetic fibers due to rubbing between the raw synthetic fibers and the processing machine base increases, and synthetic fiber processed products such as tire cords and seat belt webbing The strength reduction may increase. On the other hand, when the weight ratio of the ester component exceeds 75% by weight, when the synthetic fiber treating agent of the present invention is used for the synthetic fiber for industrial materials, the tire cord or the like has insufficient rubber adhesion, a seat belt or the like. In some cases, poor staining may occur.

  The weight ratio of the nonionic surfactant to the active ingredient is 20 to 70% by weight, preferably 25 to 65% by weight, and more preferably 30 to 60% by weight. When the weight ratio of the nonionic surfactant is less than 20% by weight, when the synthetic fiber treating agent of the present invention is used for the synthetic fiber for industrial materials, the tire cord or the like has insufficient adhesion, or the seat belt or the like. Dyeing defects may occur. On the other hand, when the weight ratio of the nonionic surfactant exceeds 70% by weight, the yarn-making property may be deteriorated due to increased friction.

The weight ratio of the anionic surfactant to the active ingredient is 0.1 to 6% by weight, preferably 0.1 to 5% by weight, preferably 0.5 to 4% by weight, more preferably 1 to 3% by weight. If the weight ratio of the anionic surfactant is less than 0.1% by weight, the antistatic effect may not be sufficient. On the other hand, when the weight ratio of the anionic surfactant exceeds 6% by weight, the tar on the heat setting roller in the spinning process may increase.
The anionic surfactant requires an organic phosphate ester salt. The weight ratio of the organic phosphate ester salt is not particularly limited, but is preferably 0.1 to 3% by weight, more preferably 0.5 to 2.5% by weight, and still more preferably 1 to 3% with respect to the active ingredient. 2% by weight. When the weight ratio of the organic phosphate ester salt is less than 0.1% by weight, the effect as an extreme pressure additive cannot be exhibited, and fluff may not be prevented. On the other hand, when the weight ratio of the organic phosphate ester salt is more than 3% by weight, the heat resistance may be lowered, and the fluff may increase.

  The weight ratio of the polyester ether compound to the active ingredient is 1 to 20% by weight, preferably 2 to 10% by weight, and more preferably 3 to 5% by weight. If the weight ratio of the polyester ether compound is less than 1% by weight, the oil film strength may not be sufficient when adhered to synthetic fibers, and the fuzz prevention effect may not be exhibited. On the other hand, when the weight ratio of the polyester ether compound exceeds 20% by weight, the viscosity of the synthetic fiber treating agent increases, and the yarn-making property may be lowered due to an increase in friction.

(Other ingredients)
The treating agent for synthetic fibers of the present invention may be in a neat state not containing a solvent, or may be in a state where an active ingredient is diluted with this solvent. Examples of the solvent used for dilution include water and paraffin oil. The kinematic viscosity at 25 ° C. of paraffin oil is not particularly limited, is preferably 1 to 10 mm ² / s, more preferably 2 to 7 mm ² / s.
When the synthetic fiber treating agent of the present invention contains water as a solvent, the weight ratio of water to the active ingredient can be appropriately set, but is preferably 75 to 90% by weight, more preferably 80 to 85% by weight. . When the weight ratio of water contained as a solvent is less than 75% by weight, the viscosity of the solution is too high, and the solution does not adhere uniformly to the synthetic fiber, which may cause fluff and yarn breakage. On the other hand, if the weight ratio of water contained as a solvent exceeds 90% by weight, the amount of water adhering to the synthetic fiber becomes excessive, heating becomes nonuniform during the stretching process, and fluffing and yarn quality degradation occur. There is.

When the treating agent for synthetic fibers of the present invention contains paraffin oil as a solvent, the weight ratio of the paraffin oil to the active ingredient can be appropriately set, but is preferably 10 to 80% by weight, more preferably 20 to 70% by weight. It is. When the weight ratio of the paraffin oil contained as the solvent is less than 20% by weight, the solution does not uniformly adhere to the synthetic fiber having a too high viscosity, which may cause fluff and thread breakage. On the other hand, if the weight ratio of the paraffin oil contained as a solvent exceeds 70% by weight, the viscosity of the solution is too low and does not adhere to the synthetic fiber, which may result in a decrease in the spinning performance.
In addition to the components described above, the treatment agent for synthetic fibers of the present invention includes phenolic, phosphite-based, thioether-based, amine-based antioxidants; caustic potash, caustic soda, organic fatty acids, amines, amino ethers, and other pHs. Conditioner: Other components such as compatibilizers such as polyhydric alcohols, higher fatty acids and higher aliphatic alcohols may be contained.

When the synthetic fiber treating agent of the present invention contains the above-mentioned other components, the weight ratio of the other components to the active component can be appropriately set, but is preferably 0.1 to 3% by weight, more preferably 0.8%. It is 3 to 2% by weight, more preferably 0.5 to 1% by weight. When the weight ratio of the other components is less than 0.1% by weight, the performance may not be sufficiently exhibited. On the other hand, when the weight ratio of the other components exceeds 3% by weight, the performance of the synthetic fiber treating agent of the present invention may be impaired, and the spinning performance may be lowered.
The treatment agent for synthetic fibers of the present invention is obtained by blending an ester component, a nonionic surfactant, an anionic surfactant essentially containing an organic phosphate ester salt, and a polyester ether compound. If necessary, other components described above may be further blended.

(Coagulation start temperature of synthetic fiber treatment agent)
The solidification start temperature of the synthetic fiber treating agent of the present invention is preferably 15 ° C. or lower, more preferably 10 ° C. or lower, and further preferably 5 ° C. or lower. If the solidification start temperature of the synthetic fiber treatment agent exceeds 15 ° C., the synthetic fiber treatment agent may solidify in the winter or in a cold region, and a uniform liquid state cannot be maintained, and sufficient performance may not be exhibited. Moreover, the handling property (handleability) at the time of synthetic fiber manufacture may deteriorate.

[Method for producing synthetic fiber]
The method for producing a synthetic fiber of the present invention includes a step of attaching the synthetic fiber treating agent to a raw synthetic fiber.
Although there is no limitation in particular as a raw material synthetic fiber, Synthetic fibers, such as polyester, polyamide, polyethylene, a polypropylene, polyvinyl alcohol, an aramid, can be mentioned, Polyester, polyamide, etc. are preferable.
The process of attaching the synthetic fiber treating agent is usually performed in the spinning process during the spinning process (stage before spinning after spinning, stage until winding of fiber yarn after completion of stretching, etc.) It is the process of giving to the raw material synthetic fiber of a yarn using oil supply apparatuses, such as a roller and a roller. Moreover, you may post-oil the raw yarn once wound up using oil supply apparatuses, such as a guide and a roller, in the stage before a twist process, a warping process, or a weaving process.

In the synthetic fiber manufacturing method of the present invention, the adhesion ratio of the active ingredient contained in the synthetic fiber treatment agent is preferably 0.2 to 3% by weight, and 0.4 to 2% by weight of the raw synthetic fiber. And more preferably 0.6 to 1.2% by weight. When the proportion of the active ingredient attached to the raw synthetic fiber is less than 0.2% by weight, the amount of the synthetic fiber treatment agent attached to the raw synthetic fiber becomes too small, and the oil film is cut. There are cases where the generation of yarn and the decrease in yarn-making property occur and the antistatic effect is not sufficient. On the other hand, if the adhesion ratio of the active ingredient to be imparted to the raw synthetic fiber exceeds 3% by weight, the friction becomes too high, the smoothness is impaired, the occurrence of fluff and yarn breakage, and the decrease in the yarn production property, or the synthetic fiber. In some cases, the amount of the processing agent attached becomes excessive, resulting in a decrease in heat resistance.
The method for producing a synthetic fiber of the present invention can be used for various synthetic fibers, but is particularly preferably used as a method for producing a high-strength synthetic fiber of 7.0 cN / dt or more.

The synthetic fiber obtained by the method for producing a synthetic fiber of the present invention can be used in various fields. In particular, it is a synthetic fiber for industrial materials produced under severe spinning conditions at high temperature and high contact pressure. preferable.
Examples of synthetic fibers for industrial materials include polyethylene terephthalate (hereinafter referred to as PET) fibers for tire cords, and the production method thereof will be described in detail below.

In order to obtain a synthetic fiber having sufficient strength for a tire cord, the intrinsic viscosity (IV) of the PET fiber after spinning and drawing needs to be 0.8 or more, and is usually 0.8 to 1.2. In order for the intrinsic viscosity (IV) of the PET fiber to satisfy such a value, a PET polymer having an intrinsic viscosity (IV) of 0.85 to 1.40 used for melt spinning may be used. Here, the intrinsic viscosity (IV) is obtained from the following equation by measuring the relative viscosity ηr at 25 ° C. of a solution in which 2 g of a sample is dissolved in 25 ml of o-chlorophenol using an Ostwald viscometer.
Intrinsic viscosity (IV) = 0.0242 × ηr + 0.2634
ηr = (t × d) / (t ₀ × d ₀ )
(Where t is the drop time of the sample solution, t ₀ is the drop time of o-chlorophenol, d is the density of the sample solution at 25 ° C., and d ₀ is the density of o-chlorophenol at 25 ° C.)
First, PET yarn melt-spun PET polymer from a spinneret is cooled and solidified, and using an oiling roller, the synthetic fiber treatment agent of the present invention is applied to the PET undrawn yarn, and then 1500 m / min or more. It is taken up by a take-up roller heated at 100 ° C. or less or a non-heated take-up roller rotated at a surface speed of preferably 1500 to 6000 m / min, more preferably 2000 to 4000 m / min.

Next, the PET unstretched yarn to which the synthetic fiber treating agent is applied is heated to a take-off roller and a range from the glass transition temperature of PET to 150 ° C. (preferably 80 to 100 ° C.). Apply 0-5% stretch to the extent that no stretching occurs with the roller. Note that the yarn feeding roller may be omitted.
Furthermore, the first-stage drawing is performed between the yarn feeding roller and the first drawing roller heated to 80 to 150 ° C. (preferably 80 to 120 ° C.) with the PET undrawn yarn to which the treatment agent for synthetic fibers is applied. To do. When the yarn feeding roller is omitted, the first stage of stretching is performed between the take-up roller and the first stretching roller. The draw ratio in the first stage is 1.20 to 2.00 times, preferably 1.30 to 1.70 times.

Subsequently, the first stretching roller and the second stretching roller heated to 230 to 260 ° C. 1.10 to 1.60 times, preferably 1.20 to 1.50 times, the second stretching. To do. After stretching in the second stage, heat treatment is performed with a relaxation of less than 5% between the second stretching roller and the tension adjusting roller, and wound with a winder. obtain. The tension adjusting roller may be a roller heated to 240 ° C. or less, or an unheated roller.
The draw ratio between the take-up roller and the second draw roller, that is, the overall draw ratio is 1.7 times or more (preferably 1.7 to 3.0 times, more preferably 2.0 to 2.8 times). Range). The total draw ratio must be less than 95% of the maximum draw ratio that can be drawn for 2 minutes or more without breaking the yarn, that is, the limit draw ratio.
Subsequently, the PET fiber for tire cord (raw yarn) obtained here is processed using a ring twisting machine to obtain a two-stranded cord.

As described above, the synthetic fiber treatment of the present invention containing a predetermined amount of an ester component, a nonionic surfactant, an anionic surfactant essentially containing an organic phosphate ester salt, and a specific polyester ether compound The agent does not require heating during use, and can prevent fluff and yarn breakage when adhered to the raw synthetic fibers. Moreover, since the synthetic fiber processing agent of this invention is maintaining liquid state at normal temperature, it can form a uniform oil film by the migration effect on the raw material synthetic fiber which supplied the processing agent. As a result, fiber processability such as twisting property and weaving property, particularly a decrease in strength of the cord after twisting can be suppressed.
Moreover, the manufacturing method of the synthetic fiber of this invention does not require a heating when attaching a processing agent to raw material synthetic fiber, and can prevent a fluff and a thread breakage. Further, according to the method for producing a synthetic fiber of the present invention, since the strength reduction of the cord after twisting can be suppressed, a synthetic fiber particularly suitable for industrial materials can be obtained.

The present invention will be described in detail in the following examples and comparative examples, but the present invention is not limited thereto.
[Production Examples A to L]
As the polyester ether compound, in the general formula (1), R ^{1 to} R ⁴ , x, y and n each produced a compound having a structure shown in Tables 1 to 3. The melting points of the respective compounds are also shown in Tables 1-3. In Production Example F, ^two R ² and R ³ are described, which means a mixture of each structure.

In Production Example F, x is 30, but is 5 when R ² contains — (CH ₂ ) ₅ —, and 25 when R ³ contains — (CH ₂ ) ₄ —. Further, y in Production Example F is 30, but when R ³ contains — (CH ₂ ) ₂ —, it is 5 and when it contains —CH (CH ₃ ) CH ₂ —, 25.
The compounds of Production Examples G to J are compounds prepared for the following Comparative Examples 1 to 4.

[Example 1]
(Manufacture of processing agents for synthetic fibers)
As shown in Table 4, an ester component, a nonionic surfactant, an anionic surfactant containing an organic phosphate ester salt, and a polyester ether compound are blended, respectively, and a synthetic fiber treating agent ( Hereinafter, it may be referred to as an oil agent).
(Manufacture of synthetic fibers)
A raw material synthetic fiber was melt-spun from a polyethylene terephthalate chip having an intrinsic viscosity of 1.25 and a carboxyl end concentration of 17 equivalents / 10 ⁶ g using an extruder-type spinning machine and a die having 480 holes. After the synthetic fiber treatment agent produced above is diluted to 20% by weight with water spun from the spinneret, the synthetic fiber treatment agent is added to the raw synthetic fiber by a guide oiling method using a metering pump. The active ingredient was deposited at 0.8% by weight. Next, after the yarn with the synthetic fiber treating agent attached thereto is taken up by a take-up roller rotating at a surface speed of 2300 m / min, the yarn is drawn 1.5 times between the take-up roller and the first draw roller, followed by The film was stretched 1.4 times between the first stretching roller and the second stretching roller. Thereafter, a relaxed treatment was performed 0.99 times to obtain a drawn yarn. The fineness of the drawn yarn was 1670 dtex, 480 f, and was a synthetic fiber for industrial materials having a strength of 8.0 cN / dt.

[Examples 2 to 11 and Comparative Examples 1 to 14]
In Example 2 and Comparative Example 14, after the synthetic fiber treatment agent was diluted to 70% by weight with paraffin oil, the synthetic fiber treatment agent was effective against the raw synthetic fiber by the guide oiling method using a metering pump. 0.8% by weight of the component was adhered to obtain a drawn yarn. The fineness of the drawn yarn was 1670 dtex and 480 f, respectively.
In Examples 3 to 11 and Comparative Examples 1 to 13, the components shown in Tables 4 to 6 were blended in the same manner as in Example 1 to prepare synthetic fiber treatment agents. Next, in the same manner as in Example 1, the synthetic fiber treatment agent diluted to 20% by weight with water was spun from the spinneret by the guide oiling method using a metering pump, respectively, in Examples 3 to 9 and In Comparative Examples 1 to 13, 0.8% by weight was adhered, in Example 10, 1.2% by weight was adhered, and in Example 11, 0.6% by weight was adhered to obtain a drawn yarn. The fineness of the drawn yarn was 1670 dtex and 480 f, respectively.

In addition, the comparative example 12 and the comparative example 13 are comparative examples in the manufacturing method of a synthetic fiber. In these two comparative examples, using the synthetic fiber treating agent of Example 1, the adhesion amount of the active ingredient was changed to 0.1 wt% and 3.5 wt%, respectively.
In Comparative Examples 2 to 4, since the oil agent solidified, physical properties other than the solidification start temperature could not be measured.

[Examples 12 to 16 and Comparative Examples 15 to 20]
In Examples 12 to 16 and Comparative Examples 15 to 20, as in Example 1, the components shown in Table 7 were blended to prepare a synthetic fiber treatment agent. Next, the synthetic fiber treatment agent was directly applied to the aramid yarn that had been subjected to yarn production (not diluted with a solvent), and the guide oiling method using a metering pump was used in Examples 12 to 14 and Comparative Examples 15 to 19 with 0.8. In Example 15 and Comparative Example 20, 1.4% by weight was deposited, and in Example 16, 0.6% by weight was deposited. The fineness of the aramid yarn was 1670 dtex, 1000f.

  The evaluations in Examples 1 to 11 and Comparative Examples 1 to 14 were performed in the following (1) to (6-A). Evaluation in Examples 12 to 16 and Comparative Examples 15 to 20 was performed in the following (5) and (6-B).

(1) fluff drawn yarn fluff generation amount: and the fluff of the number of drawn yarn per 10 ⁷ m measured by fluff counter. The case where there were less than 5 was set as the pass.
(2) Heat resistance In the synthetic fiber manufacturing process, compared to immediately after washing the drawing roller, the time until the number of fluffs is doubled or more is 20 hours or longer. It was.
(3) Antistatic property When the warping machine was stopped in the warping process of the drawn yarn, it was rated as x when the yarn was stuck or repelled.
(4) Dyeability When dyed a woven fabric of drawn yarn, X was given when dyed spots were produced, and ○ was given when no dyed spots were produced.
(5) Solidification start temperature ESPEC Co., Ltd., which was heated to 50 ° C. and stirred and homogenized, was placed in a glass bottle with a lid of 180 cc in capacity, sealed in a container, and set at a predetermined temperature. The appearance of the synthetic fiber treatment agent when the glass bottle containing the synthetic fiber treatment agent enclosed in the environmental testing machine (model PL-3KP) is allowed to stand for 90 minutes is visually determined. The temperature when cloudy or cloudy was used as the solidification start temperature. The set temperature of the environmental test machine was measured from 40 ° C., the set temperature was lowered in increments of 5 ° C., and the solidification start temperature of the synthetic fiber treating agent was measured every 5 ° C.
(6) Twisted yarn strength utilization rate (6-A)
A 1670 dtex, 480 f stretched polyethylene terephthalate yarn was twisted at 40 T / 10 cm for both the lower twist and the upper twist, and two twisted yarns were made into raw cords.
Twisted yarn strength utilization rate (%) = (strength of raw cord / strength of drawn yarn) × 100
, 92% or more as ◎, 90% or more as ○, and less than 90% as ×.
(6-B)
Aramid yarn of 1670 dtex and 1000 f was twisted at 35 T / 10 cm for both the lower twist and the upper twist, and two double twisted yarns were used to obtain raw cords.
Twisted yarn strength utilization rate (%) = (strength of raw cord / strength of drawn yarn) × 100
, 82% or more as ◎, 80% or more as ○, and less than 80% as ×.
Measurement of strength: Using an autograph AGS-5kNJ type tensile tester (manufactured by Shimadzu Corporation), the measured tensile strength of the fiber sample obtained by measuring according to JIS L-1017, 7.5 is the fineness of the fiber sample. The value divided by is taken as the strength.

In the said Tables 4-6, the compound shown to jr is as follows.
j: dioleyl adipate k: glycerol trioleate l: POE (20) sorbitan trioleate m: POE (20) castor oil n: PEG (400) laurate o: alkylsulfonate sodium salt (carbon number of alkyl group: 12-16 )
p: potassium oleate q: isocetyl phosphate triethanolamine salt In the above, POE (20) sorbitan trioleate is an average addition mole of oxyethylene obtained by polyoxyethylation of sorbitan trioleate having a hydroxyl group remaining It means sorbitan trioleate having 20 bonded polyoxyethylene groups.
r: Ester of POE hydrogenated castor oil (30) and maleic acid (molar ratio 2: 1)

In the above, POE (20) castor oil means castor oil obtained by polyoxyethylation of castor oil and bonded with a polyoxyethylene group having an average addition mole number of oxyethylene of 20.
In the above, the POE (30) hydrogenated castor oil means a hydrogenated castor oil obtained by polyoxyethylation of the hydrogenated castor oil and bonded with a polyoxyethylene group having an average addition mole number of oxyethylene of 30.
PEG (400) laurate means a laurate in which one end of polyethylene glycol having a weight average molecular weight of 400 is esterified with lauric acid.

  The synthetic fiber treating agent of the present invention can be applied to synthetic fibers such as polyester, polyamide, polyethylene, polypropylene, and aramid, and is produced especially under severe yarn-making conditions of high temperature and high contact pressure like synthetic fibers for industrial materials. Suitable for synthetic fibers.

Claims (7)

An ester component, a nonionic surfactant, an anionic surfactant essentially comprising an organic phosphate ester salt, a polyester ether compound represented by the following general formula (1) and having a melting point of 40 ° C. or lower,
The weight ratio of each component to the active ingredient consisting of the ester component, nonionic surfactant, anionic surfactant and polyester ether compound is 25 to 75% by weight of the ester component, and 20 to 70% by weight of the nonionic surfactant. %, Anionic surfactant 0.1 to 6% by weight, polyester ether compound 1 to 20% by weight,
Treatment agent for synthetic fibers.

(However, R ¹ is a residue obtained by removing n hydroxyl groups from alcohol having n hydroxyl groups in the molecule; R ² is independently an alkylene group having 2 to 5 carbon atoms; R ³ is independently R ⁴ is a hydrogen atom, a residue obtained by removing an OH group from a carboxyl group of a monovalent carboxylic acid having 2 to 24 carbon atoms, or a divalent group having 2 to 18 carbon atoms. It is obtained by adding a residue obtained by removing an OH group from a carboxyl group of a carboxylic acid, a residue obtained by removing an OH group from a carboxyl group of a trivalent carboxylic acid having 6 to 18 carbon atoms, and an alkylene oxide having 2 to 4 carbon atoms. At least one selected from the group; n is an integer of 1 to 6; x and y are each independently an integer of 5 to 100; and a lactone structural unit represented by the following general formula (2): A, an oxyalkylene structure represented by the following general formula (3) When the unit is B, the portion represented by A _x · B _y in the general formula (1) forms a random copolymer chain composed of A and B; R ⁴ is derived from a carboxyl group of a divalent carboxylic acid. In the case of the residue excluding the OH group or the residue obtained by removing the OH group from the carboxyl group of the trivalent carboxylic acid, the entire polyester ether compound contains a plurality of R ¹ by bonding with B of the polyester ether compound between molecules. It may be a thing.)

  The processing agent for synthetic fibers of Claim 1 whose weight ratio of the said organic phosphate ester salt is 0.1 to 3 weight% with respect to the said active ingredient.   The processing agent for synthetic fibers of Claim 1 or 2 whose coagulation start temperature is 15 degrees C or less.   The processing agent for synthetic fibers according to any one of claims 1 to 3, further comprising a solvent.   A process comprising the step of adhering the treatment agent for synthetic fibers according to any one of claims 1 to 4 to a raw synthetic fiber, wherein the adhesion ratio of the active ingredient is 0.2 to 3% by weight of the raw synthetic fiber A method for producing fibers.   The manufacturing method of the synthetic fiber of Claim 5 whose intensity | strength of the said synthetic fiber is 7.0 cN / dt or more.   The method for producing a synthetic fiber according to claim 5 or 6, wherein the synthetic fiber is a synthetic fiber for industrial materials.