JP6244430B2 - Treatment agent for synthetic fibers - Google Patents

Description

The present invention relates to a treatment agent for synthetic fibers (hereinafter sometimes abbreviated as a treatment agent). In more detail, it is related with the synthetic fiber processing agent, the synthetic fiber processing method, and the synthetic fiber processed by the processing method.

Various processing agents are used depending on the purpose in order to smoothly carry out the spinning and drawing processes of fibers for industrial materials. In recent years, in order to improve productivity and quality, spinning and stretching speeds have been increased and heating elements such as stretching rollers have been increasingly heated. Since spinning is performed under such severe conditions, fluff and the like are likely to occur in the spinning and drawing processes. In particular, as the heating element such as a drawing roller becomes hot, the treatment agent becomes easier to spread on the roller, and heat-degraded products of the treatment agent accumulate on the roller, resulting in frequent occurrence of fluff and an increase in the heat shrinkage rate in a short time. Problems arise.

On the other hand, there is an example that proposes application of a treatment agent that is used for synthetic fibers and suppresses the accumulation of heat-degraded products during heat treatment (see Patent Documents 1 and 2). However, these have the problem that they are limited to the production of Partially Oriented Yarns (POY).

JP-A-60-81375 Japanese Patent No. 30323889

The subject of this invention is providing the processing agent for synthetic fibers which is excellent in the removal property of the heat deterioration thing of a processing agent by preventing the expansion of the processing agent on a roller, and also softening the hardness of a heat deterioration thing. There is.

As a result of intensive studies to solve these problems, the present inventors have reached the present invention.
That is, the present invention provides a synthetic fiber containing a smoothing agent component (A), a polyalkylene glycol type nonionic surfactant (B), a polyether-modified silicone (C), and an antioxidant (D). The content of the smoothing agent component (A) in the synthetic fiber treatment agent is 40 to 80% by weight based on the total weight of (A) to (D), and the polyalkylene. The content of the glycol type nonionic surfactant (B) is 10 to 50% by weight, the content of the polyether-modified silicone (C) is 0.01 to 10% by weight, and the antioxidant (D) The synthetic fiber treating agent: the synthetic fiber treating agent is synthesized in which the polyether-modified silicone (C) has an HLB value of 1.0 to 4.5. 0.1 to 3.0% by weight based on the weight of the fiber Synthetic fiber treatment method: a synthetic fiber treated by the treatment method.

The treatment agent for synthetic fibers of the present invention has the effect of preventing the treatment agent from spreading on the roller, the heat-deteriorated product of the treatment agent being soft, and being excellent in removability of the heat-degraded product.

The treating agent for synthetic fibers according to the present invention comprises a smoothing agent component (A), a polyalkylene glycol type nonionic surfactant (B), a polyether-modified silicone (C), and an antioxidant (D). Contains oil component. In addition, the oil agent component may contain a well-known component.
When the oil agent component does not contain all or any of the smoothing agent component (A), the polyalkylene glycol type nonionic surfactant (B), the polyether-modified silicone (C), and the antioxidant (D), The smoothness, antistatic property, and removability of the heat treatment deterioration product on the roller are deteriorated.

The smoothing agent in the present invention is a base that imparts smoothness to the fiber and reduces friction applied to the fiber during spinning.
As the smoothing agent component (A) in the present invention, from the viewpoint of improving smoothness, aliphatic monocarboxylic acid alkyl ester (A1), aliphatic polycarboxylic acid alkyl ester (A2), and sulfur atom-containing aliphatic carboxylic acid alkyl ester The at least 1 sort (s) of smoothing agent component (A) chosen from the group which consists of (A3) is mentioned.

The aliphatic monocarboxylic acid alkyl ester (A1) is composed of an aliphatic monocarboxylic acid (a1) or an ester-forming derivative thereof [acid halide, acid anhydride or lower (C1-4) alcohol ester] and an alcohol ( and esters obtained from the esterification reaction with b).
Examples of the aliphatic monocarboxylic acid (a1) include aliphatic saturated monocarboxylic acids (a11) such as lauric acid, palmitic acid, stearic acid, isostearic acid and isoarachidic acid, and aliphatic unsaturated monocarboxylic acids such as oleic acid and erucic acid. Carboxylic acid (a12) is mentioned.

Examples of the aliphatic polycarboxylic acid alkyl ester (A2) include esters obtained from an esterification reaction between the aliphatic polycarboxylic acid (a2) or an ester-forming derivative thereof and the alcohol (b).
Examples of the aliphatic polycarboxylic acid (a2) include aliphatic dicarboxylic acids (a21) such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid.

Sulfur atom-containing aliphatic carboxylic acid alkyl ester (A3) includes thiodiacetic acid, thiodipropionic acid, thiodibutyric acid and thiodivaleric acid, thiodihexanoic acid and other sulfur atom-containing aliphatic carboxylic acids (a3), alcohol (b) and An ester obtained from the esterification reaction of

As alcohol (b), C8-C32 alcohol and the alkylene oxide 1-5 mol adduct of these alcohol are mentioned, for example.

Examples of the alcohol having 8 to 32 carbon atoms include aliphatic monohydric alcohols having 8 to 32 carbon atoms [aliphatic saturated monohydric alcohols (such as lauryl alcohol, palmityl alcohol, isostearyl alcohol, 2-decyltetradecanol), fats Aliphatic unsaturated monohydric alcohol (oleyl alcohol, etc.)]; aliphatic polyhydric (2-6 valent) alcohols having 8 to 24 carbon atoms [aliphatic saturated dihydric alcohol (1,6-hexanediol, neopentyl glycol, etc.) And aliphatic saturated 3 to 6-valent alcohols (trimethylolpropane, pentaerythritol, sorbitol, etc.)].

The alkylene oxide of the alkylene oxide adduct is preferably an alkylene oxide having 2 to 4 carbon atoms (hereinafter sometimes abbreviated as AO), and specifically ethylene oxide (hereinafter abbreviated as EO). ), Propylene oxide (hereinafter sometimes abbreviated as PO), butylene oxide (hereinafter sometimes abbreviated as BO), and the like. Of these, EO is more preferable from the viewpoint of emulsification.
The average added mole number of AO is preferably 1 to 4 moles from the viewpoint of smoothness.

Specific examples of the smoothing agent component (A) include isostearyl oleate, isoeicosyl stearate, isoeicosyl oleate, isotetracosyl oleate, isoarachidyl oleate, isostearyl palmitate, oleyl oleate, and the like;
Examples include adipic acid esters such as dioleyl adipate and diisostearinel adipate, and thiodipropionic acid esters such as dilauryl thiodipropionate, dioleyl thiodipropionate and diisostearyl thiodipropionate.

Among the smoothing agent components (A), from the viewpoint of smoothness, isoeicosyl stearate, isoalkyl alcohol oleate having 16 to 24 carbon atoms [isostearyl oleate, isoeicosyl oleate, isotetracosyl oleate, etc.], tri Methylolpropane trilaurate, dioleyl adipate, diisostearyl adipate, dilauryl alcohol EO 3 molar adduct adipate, dioleyl thiodipropionate, diisostearyl thiodipropionate, 2-decyltetradecyl oleate, and dilauryl alcohol EO3 molar adduct thiodipropionate is preferred.

The number average molecular weight (hereinafter sometimes abbreviated as Mn) of the smoothing agent component (A) is preferably 400 to 1,000, more preferably 500 to 800. When Mn is 400 or more, heat resistance or oil film strength as a smoothing agent component is particularly excellent, so that it is easy to obtain sufficient spinning properties. On the other hand, if Mn is 1,000 or less, dynamic friction between fibers and metals This is preferable because the coefficient is lowered and the yarn-making property is improved.

In the present invention, the number average molecular weight Mn is a calculated value from the molecular structure in the case of a compound having a single composition, and is a value measured by gel permeation chromatography (GPC) in the case of a mixture. For example, an example is given as GPC measurement conditions.
<GPC measurement conditions>
Model: HLC-8120 [manufactured by Tosoh Corporation]
Column: TSK gelSuperH4000
TSK gel SuperH3000
TSK gel SuperH2000
[Both made by Tosoh Corporation]
Column temperature: 40 ° C
Detector: RI
Solvent: Tetrahydrofuran Flow rate: 0.6 ml / min Sample concentration: 0.25% by weight
Injection volume: 10 μl
Standard: Polyoxyethylene glycol [manufactured by Tosoh Corporation; TSK STANDARD
POLYETHYLENE OXIDE]
Data processor: SC-8020 [manufactured by Tosoh Corporation]

The content of the smoothing agent component (A) in the oil component of the present invention is 40 to 80% by weight based on the total weight of (A) to (D). From the viewpoint of smoothness, it is preferably 45 to 78% by weight, more preferably 50 to 75% by weight, particularly preferably 60 to 70% by weight, based on the total weight of (A) to (D). is there.
When the smoothing agent component (A) of the present invention is less than 40% by weight based on the total of (A) to (D), sufficient smoothness cannot be obtained. Problems in appearance and emulsifiability are likely to occur.

The polyalkylene glycol type nonionic surfactant (B) in the present invention is a nonionic surfactant having a polyalkylene glycol chain, and the polyalkylene glycol chain is obtained by addition of AO having 2 to 4 carbon atoms. .

Examples of AO include EO, PO, and BO.
Among these, from the viewpoint of emulsification, the polyalkylene glycol chain is preferably an EO alone or an adduct of EO and PO (random addition or block addition).
As for the content of AO in the polyalkylene glycol type nonionic surfactant (B) in the present invention, in the case of combined use, the weight ratio of EO is preferably at least 50% based on the weight of (B).

Specific examples of the polyalkylene glycol type nonionic surfactant (B) include the following.
(B1) Higher alcohol AO adducts: EO or EO / PO 2 to 100 mol adducts of higher alcohols having 8 to 32 carbon atoms [for example, oleyl alcohol EO 5 to 25 mol adducts and stearyl alcohol EO / PO random adducts, etc.];
(B2) Carboxylic acid ester of higher alcohol AO adduct: Aliphatic carboxylic acid ether ester obtained from EO or EO / PO 6-100 mol adduct of higher alcohol having 8 to 32 carbon atoms and (a1), for example, Isostearyl alcohol EO 6-20 mole adduct oleate and the like;
(B3) AO adduct of alkylphenol: EO 4 to 100 mol adduct of alkylphenol having 6 to 24 carbon atoms in the alkyl group (octylphenol, nonylphenol, dodecylphenol, etc.);
(B4) AO adduct of fatty acid: EO 5-100 mol adduct of fatty acid having 8 to 24 carbon atoms;
(B5) Polyhydric alcohol fatty acid ester AO adduct: EO 4-100 mol adduct of 2-8 valent polyhydric alcohol monocarboxylic acid having 8 to 24 carbon atoms [the above (a1)] ester, and 2-8 Monocarboxylic acid [above (a1)] esters of EO 6-50 mol adducts of polyhydric polyhydric alcohols, such as sorbitan trioleate EO 20 mol adduct, trimethylolpropane EO 15-25 mol adduct trioleate, sorbitol EO 15- 40 mol adduct trioleate, pentaerythritol EO 15-40 mol adduct trioleate, pentaerythritol EO 15-40 mol adduct trioleate, pentaerythritol EO 15-40 mol adduct tristearate, etc .;
(B6) AO adducts of fats and oils: EO 5-50 mol adducts of castor oil and hydrogenated castor oil, etc .;
(B7) Fatty acid ester of AO adduct of fats and oils: (b6) further esterified with a fatty acid having 8 to 24 carbon atoms, such as hydrogenated castor oil EO 5-25 mol adduct trioleate, hydrogenated castor oil EO5 -25 mol adduct dioleate, castor oil EO 5-25 mol adduct distearate and the like;

(B8) Esters of polyester polyols and aliphatic monocarboxylic acids of AO adducts of fatty oils and aliphatic dicarboxylic acids: polyesters of the above (b6) and aliphatic dicarboxylic acids having 4 to 24 carbon atoms, and further terminal polyols The part is esterified with a fatty acid having 8 to 24 carbon atoms [the above (a1)], and examples thereof include an ester of a polyester polyol of a hardened castor oil EO 25 mol adduct, sebacic acid, and stearic acid.

Among these, as the polyalkylene glycol type nonionic surfactant (B), (b1), (b5), and (b6) are preferable from the viewpoint of emulsification.
Examples of (b1) include oleyl alcohol EO 5 to 25 mol adduct and stearyl alcohol EO / PO random adduct. Of these, oleyl alcohol EO 7 mol adduct is preferred.
Examples of (b5) include trimethylolpropane EO 15 to 25 mol adduct trilaurate and sorbitan trioleate EO 15 to 25 mol adduct. Of these, trimethylolpropane EO 15 to 25 mol adduct trilaurate and sorbitan trioleate EO 20 mol adduct are preferred.
Examples of (b6) include hydrogenated castor oil EO 5 to 25 mol adduct. Of these, hydrogenated castor oil EO of 10 to 25 mol is preferable.

Furthermore, the polyalkylene glycol type nonionic surfactant (B) preferably contains (b8) from the viewpoint of high extreme pressure and improving oil film strength.
(B8) As an ester of polyester polyol and stearic acid of hydrogenated castor oil EO 10-25 mol adduct and sebacic acid, or a polyester polyol of stearic acid hardened castor oil EO 10 to 25 mol adduct and maleic anhydride Examples include esters. Among these, from the viewpoint of maintaining the oil film strength with high extreme pressure, polyester polyol of hardened castor oil EO 25 mol adduct and sebacic acid and stearic acid, and polyester polyol of hardened castor oil EO 25 mol adduct and maleic anhydride And esters of stearic acid are preferred.

Mn of the polyalkylene glycol type nonionic surfactant (B) is preferably in the range of 500 to 10,000, more preferably 600 to 8,000. If Mn is 500 or more, the fiber converging property at the time of drawing is good, the phenomenon of single yarn separation is small, and the drawing property tends to be improved. On the other hand, if Mn is 10,000 or less, the appearance of the treatment agent is good and a uniform solution is easily obtained.
In the present invention, Mn is a value calculated from the molecular structure in the case of a compound having a single composition, and is a value measured by GPC in the case of a mixture. For example, the GPC measurement conditions described above can be used.

The content of the polyalkylene glycol type nonionic surfactant (B) in the oil component of the present invention is 10 to 50% by weight based on the total weight of (A) to (D). From the viewpoint of improving the appearance and emulsifiability of the treatment agent, it is preferably 12 to 45% by weight, more preferably 15 to 40% by weight, based on the total weight of (A) to (D).
When the polyalkylene glycol type nonionic surfactant (B) is less than 10% by weight based on the total weight of (A) to (D), it tends to cause problems in the appearance and emulsifiability of the treatment agent, When it exceeds 50% by weight, the smoothness becomes insufficient.

The treatment agent of the present invention contains polyether-modified silicone (C).
Polyether modification is to have AO in the main chain and / or side chain in silicone (C).

The polyalkylene glycol chain is preferably an adduct of EO alone or a combination of EO and PO (random addition or block addition).

The HLB value of the polyether-modified silicone (C) in the present invention is 1 to 4.5. When the HLB value exceeds 4.5, the spread preventing property of the treatment agent on the roller becomes poor.
In the present invention, the HLB value is a calculated value based on the Griffin method.

The polyether-modified silicone (C) contained in the treatment agent of the present invention is contained in an amount of 0.01 to 10.0% by weight based on the total weight of (A) to (D). From the viewpoint of removability of the heat-deteriorated product, it is preferably 0.03 to 5.0% by weight, more preferably 0.05 to 3.0% by weight, based on the total weight of (A) to (D). is there.
If it exceeds 10% by weight, the hardness of the heat-deteriorated product of the treatment agent becomes poor, and if it is less than 0.01% by weight, the spread prevention property of the treatment agent on the roller is deteriorated.

The treatment agent of the present invention contains an antioxidant (D). An antioxidant is a chemical | medical agent for suppressing the oxidation of a processing agent and softening the hardness of the heat degradation thing of a processing agent.

As the antioxidant (D) in the present invention, 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine [ Irganox 565], triethylene glycol-bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate [Irganox 245], pentaerythritol-tetrakis [3- (3,5-di-) A hindered phenolic antioxidant such as [t-butyl-4-hydroxyphenyl) propionate] [Irganox 1010] is preferred.
Further, a sulfur-based antioxidant such as 2-mercaptobenzimidazole and a phosphorus-based antioxidant such as poly (dipropylene glycol) phenyl phosphite may be used in combination.

In order to suppress the oxidation of the treatment agent and to soften the hardness of the heat-deteriorated product of the treatment agent, the content of the antioxidant (D) is 0.1 based on the total weight of (A) to (D). It is -5.0 weight%, Preferably it is 0.3-2.0 weight%, More preferably, it is 0.5-1.5 weight%.

  The treatment agent for synthetic fibers of the present invention comprises an oil agent component containing a smoothing agent component (A), a polyalkylene glycol type nonionic surfactant (B), a silicone (C) and an antioxidant (D). It can be obtained by mixing and uniformly mixing by heating (for example, 30 to 90 ° C.) if necessary. The blending order and blending method of each component are not particularly limited.

Other arbitrary additives (E) can be blended with the treatment agent of the present invention as long as the performance is not impaired.
Examples of the additive (E) include antistatic agents (alkyl phosphate ester salts and fatty acid soaps), pH adjusters (alkalis such as sodium hydroxide and potassium hydroxide, alkylamines and alkylene oxide adducts of alkylamines). Amines, organic acids such as oleic acid, etc.), ultraviolet absorbers, viscosity modifiers, and appearance modifiers.
The content of these additives (E) is preferably 10% by weight or less based on the weight of the synthetic fiber treating agent.

In the treatment agent of the present invention, the spreadability of the treatment agent on the roller and the hardness of the heat-deteriorated product of the treatment agent are important for improving the removability of the heat-deteriorated treatment agent on the roller.

The synthetic fiber of the present invention is obtained by treating with a mineral oil solution obtained by mixing the synthetic fiber treating agent of the present invention with mineral oil.
A mineral oil solution is obtained by mixing the synthetic fiber treating agent of the present invention with 20 to 90% by weight of mineral oil.

By treating this mineral oil solution, the solid content in the treatment agent for synthetic fibers can be adhered to 0.1 to 3.0% by weight based on the weight of the synthetic fibers (hereinafter, the treatment method). Is abbreviated as straight lubrication).

The synthetic fiber of the present invention can also be obtained by treating with the emulsion obtained by mixing the synthetic fiber treating agent of the present invention with water.
The emulsion is obtained by mixing the synthetic fiber treating agent containing the surfactant (B) of the present invention with 70 to 90% by weight of water.

By treating this emulsion, the solid content in the synthetic fiber treating agent can be adhered to 0.1 to 3.0% by weight based on the weight of the synthetic fiber (hereinafter, the treatment method is referred to as emulsion). Abbreviated as refueling).

As a method for attaching the synthetic fiber treating agent to the synthetic fiber, a known method or the like can be used, and it can be applied using a roller or a guide oiling device or the like before the spinning step, the drawing step or the winding. The adhesion amount of the treatment agent for synthetic fiber of the present invention to the synthetic fiber is preferably 0.5 to 1.0% by weight based on the weight of the synthetic fiber before treatment.

When straight lubrication is used as the method for treating synthetic fibers of the present invention, the concentration of the oil component is preferably 25 to 75% by weight, more preferably 30 to 70% by weight, from the viewpoint of yarn production.
When the amount exceeds 75% by weight, the yarn is taken up by the treatment agent when the treatment agent is applied using the oil supply roller or the oil supply nozzle, so that the yarn production is likely to be unstable, and the effect of improving the yarn production property is hardly obtained. When the concentration of the oil component is less than 25% by weight, the treatment agent tends to scatter on the pre-stretching roller (feed roller), which is not preferable from the viewpoints of oil component adhesion efficiency and disaster prevention.

  Examples of mineral oil used for straight oil supply include refined spindle oil and liquid paraffin.

When emulsion oil supply is used as the synthetic fiber treatment method of the present invention, the concentration of the oil component is preferably 10 to 30% by weight, more preferably 15 to 25% by weight, from the viewpoint of yarn production.
When the amount exceeds 30% by weight, the yarn is taken up by the treatment agent when the treatment agent is applied using the oil supply roller or the oil supply nozzle, so that the yarn production tends to become unstable, and the effect of improving the yarn production property is hardly obtained. When the concentration of the oil component is less than 15% by weight, the treatment agent tends to scatter on the pre-stretching roller (feed roller), which is not preferable from the viewpoint of oil component adhesion efficiency.

Straight oil supply is preferred as a treatment method when spinning nylon fibers from the viewpoint of yarn production. Emulsion oiling is preferred as a method for treating other fibers from the viewpoint of disaster prevention and cost.

The treatment agent for synthetic fibers of the present invention can be used for synthetic fibers.
Synthetic fibers are, for example, fibers for industrial materials such as airbags, nylon fibers for tire cords and airbags, tire cords, polyester fibers for seat belts.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to this.

<Example 1>
2-decyltetradecyl oleate 29.2 parts by weight, dilauryl alcohol EO 3 mol adduct thiodipropionate 42.0 parts by weight, trimethylolpropane EO 24 mol adduct trilaurate 9.7 parts by weight, hydrogenated castor oil EO 25 mol adduct 14.5 parts by weight of an ester of polyester polyol and stearic acid, and 1.2 parts by weight of irganox 245, 0.7 parts by weight of 2-mercaptobenzimidazole, and stirred at 90 to 100 ° C. for 1 hour. . After homogenization, the mixture is cooled to 40 ° C. or less, and 1.8 parts by weight of an EO 15 mol adduct of beef tallow alkylamine and 0.2 parts by weight of polyether-modified silicone (C1-1) are mixed. It was adjusted.

<Examples 2-9 and Comparative Examples 1-5>
Each component was blended in the same manner as in Example 1 except that each component was blended in the blending parts by weight described in Table 1, and the treating agents for synthetic fibers in Examples 2 to 9 and Comparative Examples 1 to 5 were prepared. .

In addition, each component in Table 1 is as follows.
(A1-1): 2-decyltetradecyl oleate (A1-2): trimethylolpropane trilaurate (A2-1): adipic acid ester of dilauryl alcohol EO3 molar adduct (A3-1): lauryl alcohol EO3 Mole adduct thiodipropionate (B2-1): trimethylolpropane EO 24 mol adduct trilaurate (B2-2): sorbitan trioleate EO 20 mol adduct (B3-1): hydrogenated castor oil EO 25 mol adduct (B4- 1): hydrogenated castor oil EO 20 mol adduct trioleate (B5-1): ester of hydrogenated castor oil EO 25 mol adduct, polyester polyol of sebacic acid and stearic acid (B5-2): hydrogenated castor oil EO 25 mol addition Of polyester polyols with maleic anhydride and stearic acid Ester (C1-1): Polyether-modified silicone (HLB of pamphlet = 4)
(C′1-2): polyether-modified silicone (HLB = 5 described in the pamphlet)
(C′2-1): Long chain alkyl-modified silicone antioxidant (D1-1): Irganox 245
Antioxidant (D1-2): 2-Mercaptobenzimidazole Antioxidant (D1-3): Irganox 565
pH adjuster (E1-1): tallow alkylamine EO 15 mol adduct antistatic agent (E2-1): 2-decyltetradecanol phosphate potassium salt (monoester / diester = 50/50)
Antistatic agent (E2-2): EO 5-mol adduct phosphate ester potassium salt of isooctadecanol (monoester / diester = 50/50)

  Using the treatment agents for synthetic fibers of Examples 1 to 9 described in Table 1 and Comparative Examples 1 to 5 described in Table 2, the expansion prevention evaluation and the hardness evaluation of the heat-deteriorated product were performed.

<Evaluation method of spread prevention property of treatment agent>
The spread prevention property of the treating agent is performed by the following method.
(1) A metal plate whose surface is plated with metallic chrome [surface roughness is defined by ISO R 1302 and JIS B 0601. Centerline average roughness (Rs): 1.6a, maximum height (Rmax): 6.3S, width 30 mm, length 300 mm) is set on a heater with an inclination angle of 30 °.
(2) Heated with a heater so that the surface temperature of the metal plate becomes 230 ° C., and moved 4 ml of the sample treatment agent to a position 10 mm from the upper end of the metal plate at 0.35 g / hour for 8 hours using a microtube pump. Add dropwise.
(3) After completion of the dropping, the expansion width of the treatment agent (lateral spread) 100 mm below the dropping position of the metal plate and the expansion width of the treatment agent 200 mm below are respectively measured, and the arithmetic average value is determined as the treatment agent. The expansion width.

It shows that it is excellent in the spread prevention property of a processing agent, and the removal property of the heat-deteriorated material of a processing agent is so favorable that a processing agent spread width is low.
[Criteria]
◎: Oil agent expansion width is 5 mm or less ○: Oil agent expansion width is 6 mm to 10 mm
Δ: Oil spread width is 11 to 15 mm
X: Oil agent expansion width exceeds 15 mm

<Method for measuring hardness of heat-deteriorated treatment agent>
(1) Sample preparation 0.5 g of the treatment agent is weighed in a petri dish made of SUS (diameter 50 mm, depth 10 mm) and fired in a circulating dryer at 250 ° C. for 24 hours.

(2) Hardness measurement The hardness of the heat-deteriorated product of the treating agent is JISK5600-5-4: 1999 "Paint general test method-Part 5: Mechanical properties of coating film-Section 4: Scratch hardness (pencil method)" In conformity, measured by handwriting method.

The hardness of the heat-deteriorated product of the prepared treatment agent was measured and judged according to the following criteria. The lower the hardness, the better the removability of the heat-deteriorated product of the treatment agent.
[Criteria]
○: Pencil hardness is 6B
Δ: Pencil hardness is 5B to 2B or less ×: Pencil hardness is B or more

As is apparent from Table 1, it can be seen that the treatment agents of Examples 1 to 9 of the present invention are excellent in all of the treatment agent's spread preventing property and the hardness of the heat-deteriorated product of the treatment agent. On the other hand, Comparative Examples 1 to 5 do not satisfy all the performance items.

The treatment agent for synthetic fibers of the present invention is excellent in smoothness and antistatic properties required in the spinning and drawing processes, and is also processed in higher temperatures of heating elements such as spinning, drawing speed and drawing rollers in recent years. Prevents the spread of the agent, and the heat-degraded product of the treatment agent for synthetic fibers is soft and has excellent removability of the heat-degraded product of the treatment agent. It can be suitably used for spinning and drawing processes of polyester fibers for belts.

Claims (5)

  A treating agent for synthetic fibers comprising a smoothing agent component (A), a polyalkylene glycol type nonionic surfactant (B), a polyether-modified silicone (C), and an antioxidant (D). Based on the total weight of (A) to (D), the content of the smoothing agent component (A) in the treating agent for synthetic fibers is 40 to 80% by weight, and a polyalkylene glycol type nonionic surfactant The content of (B) is 10 to 50% by weight, the content of the polyether-modified silicone (C) is 0.01 to 10% by weight, and the content of the antioxidant (D) is 0.1 to 0.1%. The processing agent for synthetic fibers which is 5.0 weight% and whose polyether modified silicone (C) has an HLB value of 1.0 to 4.5. The smoothing agent component (A) is at least one selected from the group consisting of an aliphatic monocarboxylic acid alkyl ester (A1), an aliphatic polycarboxylic acid alkyl ester (A2), and a sulfur atom-containing aliphatic carboxylic acid alkyl ester (A3). The processing agent for synthetic fibers according to claim 1, which is a seed. The synthetic fiber processed by the mineral oil solution of the processing agent for synthetic fibers of Claim 1 or 2.   Synthetic fiber processed by the emulsion of the processing agent for synthetic fibers of Claim 1 or 2.   A synthetic fiber, wherein the synthetic fiber according to claim 3 or 4 is for industrial materials.