KR20170112584A - Manufacturing method of sea-island complex fiber, manufacturing method of nonflammable resin including the same and sea-island complex fiber thereby - Google Patents

Abstract

The method of producing a present resin of the present invention can reduce weight by a non-alkali reducing process as a sea component containing a water-releasing resin. Thus, there is an effect that the excellent physical properties, dyeability, and flame retardancy of the isoprene-based fiber can be maintained.

Description

Technical Field [0001] The present invention relates to a method for producing sea-island composite fibers, a method for producing the same, and a method for manufacturing sea-island complex fibers using the same. fiber thereby}

More particularly, the present invention relates to a method for producing sea-island composite fibers, a method for producing the same, and a sea-island composite fiber produced by the method.

In general, curtains, wallpaper, carpets, flame-retardant non-woven fabrics, and other ornaments are made into flame-retarded fabrics and non-woven fabrics for safety, in places where people are densely packed, places with plenty of electric facilities, and places with many closed spaces. Therefore, in the conventional flame retardant yarn, the synthetic fiber was melt-elongated to prepare a synthetic fiber, and then the surface of each synthetic fiber was treated with a flame retardant agent so as not to burn due to flame. In addition, in the conventional method of flame-retarding treatment, the synthetic fiber is made into a fabric by using a weaving machine or a knitting machine, and then the surface of the fabric is treated with a flame retardant agent so as not to be ignited by fire. However, conventionally, since a flame retardant is applied to the surface of a synthetic fiber or a fabric, a flame retardant is easily removed depending on the time of use, and the flame retardant .

Further, in the case of the flame-retardant fiber, there is a tendency to be used in a high-grade fabric product, and in a product using a high-grade fabric, a high deliquescence property is required. In order to produce such a product, a complementary agent, a dye, / ≪ / RTI > fibers. However, in the case of conventional flame retardant fibers and / or resins for producing the same, there is a problem that the physical properties of the flame-retardant fibers and / or fabrics produced by the additive composition for improving the color sharpness, the process and the like are reduced. For example, Korean Patent Laid-Open Publication No. 2005-0103617 discloses a flame-retardant polyester added with a complementary agent and imparted excellent color development during the dyeing process. In the dyeing process, hydrolysis of a flame- In addition, Korean Patent Laid-Open Publication No. 2003-0028022 describes a method for producing polyester using a cacao dye, which requires pretreatment of a metal sulfonate salt in order to maintain spinnability in the production of a polyester composition capable of dyeing into a cacao dye There is a problem in that the process cost is increased and the modifier content is increased in order to improve the sharpness of color, which causes a decrease in the physical properties of the yarn and an increase in pack pressure during the process.

Conventionally, as a flame retardant polyester sea-island composite fiber, an alkali-soluble polyester polymer is used as a sea component, and a sea-island composite fiber using flame-retardant polyester as a component is disclosed. In order to improve the solubility of marine components There is a problem that hydrolysis and flame retardant disappear when the alkali reduction process is carried out under a strong base and high temperature conditions, resulting in the deterioration of the physical properties, dyeability, and flame retardancy of the final product.

KR 2005-0103617A KR 2003-0028022A

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a method for producing sea-island composite fibers capable of improving flame retardancy and dyeability and capable of reducing weight by water elution, The present invention has been made in view of the above problems.

Another object of the present invention is to provide a method for producing a flame-retardant resin fiber which can prevent the deterioration of the dyeability, the physical properties, and the flame retardancy of the flame-retardant fiber even when the reduction process is performed.

One aspect of the present invention provides a method for producing sea-island complex fibers. The method for producing the sea-island type conjugate fiber comprises a first step of preparing a flour resin and a sea component resin; Drying the island component resin and the sea component resin; And an island-in-the-sea type composite fiber comprising the sea component resin as a sea component and the island component resin as a conductive component by performing combined radiation of the dried island component resin and the sea component resin The flame retardant resin comprising 90 to 99.5 mol% of a polyester and 0.5 to 10.0 mol% of a metal sulfonate; And a flame retardant comprising at least one of a nitrogen-based flame retardant and an inorganic flame retardant including phosphorus (P) at a weight ratio of 4: 1 to 14: 1, wherein the sea- 20 to 30 mol% of an aromatic polycarboxylic acid having 6 to 14 carbon atoms, 10 to 20 mol% of a metal sulfonate, and 10 to 20 mol% of an aliphatic diol.

In one preferred embodiment of the present invention, the nitrogen-based flame retardant includes at least one member selected from the group consisting of melamine, melamine cyanurate, melamine phosphate, melamine polyphosphate, and melamine pyrophosphate, Aluminum, magnesium hydroxide, zinc borate, and zinc diethylphosphinate.

In one preferred embodiment of the present invention, the polyester may be a polyethylene terephthalate (PET) resin having a weight average molecular weight of 18,000 to 22,000.

In one preferred embodiment of the present invention, the composite spinning can be performed at a spinning temperature of 270 to 300 ° C and a spinning speed of 3,000 to 5,000 mpm.

In one preferred embodiment of the present invention, the second step may be performed at a temperature of 110 to 130 ° C for 3 to 5 hours.

In one preferred embodiment of the present invention, in step 3, the resin component and the sea component resin may be contained in a weight ratio of 50:50 to 90:10.

In one preferred embodiment of the present invention, the metal sulfonate is selected from the group consisting of dimethyl 5-sodiosulfoisophthalate, sodium 3,5-dicarbomethoxybenzenesulfonate, and dicarbomethoxybenzenesulfonate. Or more species.

In one preferred embodiment of the present invention, the aromatic polycarboxylic acid having 6 to 14 carbon atoms may include at least one member selected from the group consisting of terephthalic acid, isophthalic acid, and dimethyl terephthalate.

In one preferred embodiment of the present invention, the aliphatic diol may include an aliphatic diol having 2 to 20 carbon atoms.

In one preferred embodiment of the present invention, the aliphatic diol is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, trimethyl glycol, tetramethylene glycol, pentamethyl glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol , Nonane methylene glycol, decamethylene glycol, undecamethylene glycol, dodecamethylene glycol, and tridecamethylene glycol.

Another aspect of the present invention provides a method for producing a flame retardant resin fiber. The method for producing the flame-retarded resin fiber comprises the steps of producing the sea-island conjugate fiber by the method for producing sea-island conjugate fiber of the present invention; And a fourth step of reducing the alkali-free composite fiber to a non-alkali.

In a preferred embodiment of the present invention, the fourth step may be performed for 10 to 50 minutes at a hot water temperature of 80 to 110 ° C.

Another aspect of the present invention provides a sea-island composite fiber. (Island in the Sea) type conjugate fiber comprising a sea component resin as a sea component and a cast component resin as a component, wherein the island component resin comprises 90 to 99.5 mol% of a polyester and 0.5 To 10.0 mol% of a flame retardant resin; And a flame retardant comprising at least one of a nitrogen-based flame retardant and an inorganic flame retardant including phosphorus (P) at a weight ratio of 4: 1 to 14: 1, wherein the sea- 20 to 30 mol% of an aromatic polycarboxylic acid having 6 to 14 carbon atoms, 10 to 20 mol% of a metal sulfonate, and 10 to 20 mol% of an aliphatic diol.

The flame retardant resin fiber produced by the present invention has improved flame retardancy and dyeability. In addition, the method for producing a flame retardant ester fiber of the present invention has the effect of preventing the deterioration of the dyeability, physical properties, and flame retardancy of the flame retardant fiber even when the weight loss process is performed.

1 is a cross-sectional view of chart plotter according to one embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals designate like elements throughout the specification.

A method for producing a flame-retarded resin fiber according to an embodiment of the present invention includes a first step of preparing a flour resin and a sea component resin, a second step of drying the flour resin and the sea component resin, (Island in the Sea) type composite fiber comprising the sea component resin as a sea component and the island component resin as a component, And four steps of reducing the fiber to non-alkali.

As the first step, a flour resin and a sea component resin are prepared. The flame retardant resin comprises 90 to 99.5 mol% of polyester and 0.5 to 10.0 mol% of metal sulfonate; And phosphorus (P), and a flame retardant containing at least one of an inorganic flame retardant and an inorganic flame retardant, at a weight ratio of 4: 1 to 14: 1.

The above-mentioned flour resin is a composition for forming a flour as a fiber-forming component in the later-described production of sea-island fiber, which corresponds to a composition for forming a flame-retardant resin fiber remaining after the above-

In the flame retardant resin, when the polyester is less than 90.0 mol%, fiber formation may be difficult, and when the polyester fiber is more than 99.5 mol%, the addition amount of the metal sulfonate may be limited. The polyester may be a polyethylene terephthalate (PET) resin having a weight average molecular weight of 18,000 to 22,000.

The metal sulfonate performs thermal degradation which improves the dyeability of the component resin. In the flame retardant resin, when the metal sulfonate is less than 0.5 mol%, the effect of improving the dyeability of the resin component may be limited. When the metal sulfonate is more than 10.0 mol%, the addition amount of the polyester may be relatively limited .

The metal sulfonate may include at least one selected from the group consisting of dimethyl 5-sodiosulfoisophthalate, sodium 3,5-dicarbomethoxybenzenesulfonate, and dicarbomethoxybenzenesulfonate.

By including the metal sulfonate in the polyester, a flame retardant resin having excellent flame retardancy is obtained.

The flame retardant resin further includes at least one of a nitrogen-based flame retardant and an inorganic flame retardant. Wherein the nitrogen-based flame retardant includes at least one selected from the group consisting of melamine, melamine cyanurate, melamine phosphate, melamine polyphosphate, and melamine pyrophosphate, and the inorganic flame retardant is at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, And Zinc Diethyl phosphinate (C4H11O2P? 1 / 2Zn).

Next, the sea component resin will be described. The sea component resin is a component that forms a sea component, which is an extract component, from sea water fibers. Wherein the sea component resin comprises 50 to 70 mol% of a polyester, 20 to 30 mol% of an aromatic polycarboxylic acid having 6 to 14 carbon atoms, 10 to 20 mol% of a metal sulfonate, and 10 to 20 mol% Ester resin.

The polyester may be a polyethylene terephthalate (PET) resin having a weight average molecular weight of 18,000 to 22,000. When the content of the polyester in the sea component resin is less than 50 mol%, the sea component ratio in the sea water fiber described later may be smaller than the initial design value. Further, when the content of the polyester exceeds 70 mol%, the content of other components may be limited.

The aromatic polycarboxylic acid having 6 to 14 carbon atoms serves to reduce crystallinity. If the aromatic polycarboxylic acid having 6 to 14 carbon atoms is less than 50 mol%, the effect of decreasing the crystallinity may be deteriorated, and if the aromatic polycarboxylic acid having 6 to 14 carbon atoms exceeds 60 mol% The content of other components may be limited. The aromatic polycarboxylic acid having 6 to 14 carbon atoms may include at least one member selected from the group consisting of terephthalic acid, isophthalic acid, and dimethyl terephthalate.

Unlike the metal sulfonate salt in the island-shaped resin, the metal sulfonate salt induces adsorption of water molecules to induce the sea salt resin to be water-soluble. Specifically, it contains 5 to 10 mol% in the resin component, while 20 to 30% in the component of the sea component resin. When the metal sulfonate is less than 20 mol%, the effect of inducing water molecule adsorption is limited. Therefore, the weight loss may not be sufficiently achieved due to the following alkali reduction, and the metal sulfonate may contain 30 mol% The content of other components may be limited.

The aliphatic diol may be esterified with the polyester to obtain a polyester resin. In the above sea component resin, when the aliphatic diol is less than 10 mol%, the yield of the sea component resin may be low, and when it is more than 20 mol%, unreacted aliphatic diol may occur.

The aliphatic diol is preferably an aliphatic diol having 2 to 20 carbon atoms and preferably an aliphatic diol having 2 to 20 carbon atoms such as ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, trimethylglycol, tetramethylene glycol, pentamethylglycol, hexamethylene glycol, Octamethylene glycol, nonane methylene glycol, decamethylene glycol, undecamethylene glycol, dodecamethylene glycol, and tridecamethylene glycol. And more preferably at least one selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, and butylene glycol.

In step 2, the island component resin and the sea component resin are dried. The drying step may be performed at a temperature of 110 to 130 ° C, preferably at a temperature of 110 to 120 ° C, to improve the degree of crystallization by removing moisture to a moisture content of 100 ppm or less. can do. If the drying temperature is less than 110 ° C, the resin may not be dried sufficiently. If the drying temperature exceeds 130 ° C, the intrinsic viscosity may decrease.

In the above step 3, the dried island-like resin and the sea-salt resin are subjected to combined spinning so as to contain the sea-salt resin as a sea component, and the Island in the Sea type Thereby producing a composite fiber.

The spinning of the spinning step may be carried out at a spinning temperature of 270 ° C. to 300 ° C. and a spinning speed of 3,000 mpm to 5,000 mpm, preferably a spinning temperature of 270 ° C. to 290 ° C. and a spinning speed of 3,500 mpm to 4,800 mpm Lt; / RTI > If the spinning temperature is less than 270 ° C, there may be a problem that the alignment of the polymer is insufficient, resulting in a problem of a dyed yarn (defective dyeing) due to unstretching. When the temperature exceeds 300 ° C, pyrolysis due to high temperature occurs, There may be a problem of deterioration. If the spinning speed is less than 3,000 mpm, there may be a problem that the alignment of the polymer is insufficient and a dyed yarn (defective dyeing) may be generated due to the unstretched yarn, resulting in a cost increase due to a decrease in productivity. If the molecular weight exceeds 5,000 mpm, there may be a problem that the alignment of the polymer is insufficient and a dyed yarn due to unstretched yarn (defective dyeing) may occur, resulting in a cost increase due to a decrease in productivity.

In addition, in the present invention, the spinning can be carried out using a general sea type composite spinneret used in the art, and the spinning can be carried out by using a compound spinning dike (30) and a casting spinning dike (31) Spinning can be used.

At this time, the island component resin and the sea component resin may be mixed in a weight ratio of 50:50 to 90:10. When the amount of the resin component and the component of the sea component is less than 50:50 by weight, the flame-retarding effect of the metal sulfonate contained in the resin component can be reduced, and the resin component and the sea component resin may have a weight ratio of 90:10 The weight of the marine component in the fiber is small, so that the flame retardant component can not be effectively prevented from falling off.

In the fourth step, the islands-like conjugate fiber is non-alkali-reduced. At this time, the weight loss of non-alkali is possible because the above-mentioned sea component resin shows water-solubility, which is carried out using water other than alkali.

The non-alkali reduction may be carried out in hot water at a temperature of 80 to 110 DEG C for 10 to 50 minutes. If the temperature of the hot water is less than 80 ° C at the time of the reduction, the rate of the reduction may be slowed down and the process time may be slowed. If the hot water temperature exceeds 110 ° C, side reactions may occur. In addition, if the non-alkali reducing process time is less than 10 minutes, the extraction of the sea component may not be completely performed even if a sufficient loss is not achieved, and if it exceeds 50 minutes, a side reaction may occur.

The flame-retardant water-receiving resin fibers produced by the above-described method for producing a flame-retardant water-receptive resin fiber are subjected to a weight loss process by a non-alkali weight loss rather than an alkali loss, so that the physical properties, dyeability and flame retardancy Can provide a fiber excellent in physical properties, dyeability, and flame retardancy.

When the flame-retardant receiving resin fiber of the present invention has an average diameter of 15 占 퐉 and an average fineness of 150 占, the rate of change of the strength of the conjugate fiber can satisfy the following formula (1).

[Equation 1]

In the above formula (1), the strength of the conjugate fiber is measured in accordance with ASTM D2256 method, the unit of strength is g / d, the strength change rate is 0.5% to 10%, more preferably 1% to 3% to be.

Hereinafter, exemplary embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are intended to aid understanding of the present invention, and the present invention is not limited by the following experimental examples.

[ Example ]

< Example  1 - Manufacture of flame retardant resin fibers>

(One) Urban area  Suzy( Urban area  Fiber composition) manufacture

98.7 mol% of polyethylene terephthalate and 1.3 mol% of dimethyl 5-sodiosulfoisophthalate were mixed, and esterification reaction was carried out while removing water generated at 240 캜. Thereafter, the mixture was subjected to a polylamentation process at a temperature of 280 to 285 ° C and a vacuum of 1.5 torr or less to obtain a CD (Cation Dyeable) polyester resin through condensation polymerization. The intrinsic viscosity (IV) of the CD-based polyester resin thus prepared was 0.720 dl / g when measured by a Ubbelohde viscometer.

Next, Zinc Diethyl phosphinate (C4H11O2P? 1 / 2Zn) was added to the CD-based polyester resin at a concentration of 6000 ppm based on the P-based polyester resin to obtain P (phosphorus) + An inorganic additive type resin component (a component resin) was produced.

 (2) Export availability  Suzy( Sea star  Fiber composition) manufacture

60 mol% of polyethylene terephthalate, 20 mol% of isophthalic acid, 10 mol% of dimethyl 5-sodium diisopropyl isophthalate, and 10 mol% of diethylene glycol, The intrinsic viscosity (IV) of the resin for sheath produced was 0.820 dl / g.

(3) Sea-island  Produce

The CD-based flame retardant polyester resin was added to the sea-island composite spinneret and the above-described water-soluble resin was added to the dissolution portion, followed by spinning at a spinning temperature of 280 ° C and a spinning speed of 4,200 mpm. Mu m, an average fineness of 150 d, a core of 80 wt%, and a cis 20 wt%).

(4) Reduction process

The sea-island fibers were reduced in hot water (FW) at 98 占 폚 for about 30 minutes to prepare a CD-based composite flame-retardant polyester fiber.

< Comparative Example  1>

The same procedure as in Example 1 was carried out except that the flame retardant resin was used in the production of the flour resin.

< Comparative Example  2>

The fibers were prepared in the same manner as in Example 1 except that only the second flour was used in the production of the flour resin.

< Comparative Example 3  >

The fibers were prepared in the same manner as in Example 1 except that the weight reduction step was carried out at a temperature of 98 ° C in an aqueous 5% NaOH solution for 30 minutes.

< Comparative Example 4  >

The fibers were prepared in the same manner as in Comparative Example 1 except that the weight loss step was carried out in an aqueous 5% NaOH solution at 98 ° C for 30 minutes.

< Comparative Example 5  >

The fibers were prepared in the same manner as in Comparative Example 2 except that the weight loss step was carried out in an aqueous 5% NaOH solution at 98 ° C for 30 minutes.

< Comparative Example 6  >

The fibers were prepared in the same manner as in Comparative Example 3 except that the weight loss step was carried out at a temperature of 98 ° C in an aqueous 5% NaOH solution for 30 minutes.

Experimental Example  : Measurement of physical properties of water-soluble flame retardant fiber

(1) Strength measurement

The strength of the fiber was measured using an automatic tensile tester (Textechno) at a speed of 50 cm / m and a grip distance of 50 cm. The strength is defined as the strength (%) of the initial length of the elongated length as a percentage (g / de) divided by the denier when the fiber was stretched until it was stretched to give a constant force .

The strength change ratio (%) was measured according to the following equation (1).

[Equation 1]

In Equation (1), the unit of intensity is g / d.

(2) Measurement of weight loss

The weight loss of the fibers was measured by measuring the mass of the fibers before the loss and the weight of the fibers after the loss.

The results of the experiments are shown in Table 1 below.

division The island (de) Before dyeing processing After dyeing process Intensity change rate
(%) Weight loss rate
(%) Strength (g / de) Weight (g) burglar
(g / de) Weight (g) Example 1 150 3.3 5.61 3.23 5.58 2.12 0.17 Comparative Example 1 150 3.99 5.83 3.96 5.77 1.03 1.03 Comparative Example 2 150 4.13 6.78 4.05 6.72 1.94 0.88 Comparative Example 3 150 - 6.32 - 2.43 - 61.6 Comparative Example 4 150 4.13 6.29 2.38 5.12 42.37 18.6 Comparative Example 5 150 3.99 6.21 3.07 5.16 23.06 16.19

The results of the tests of the above Table 1 show that in the case of Example 1, Comparative Example 1 and Comparative Example 2 in which the non-alkali reduction was performed, the rate of change in strength and weight was low, It can be seen that the rate of change in strength and weight is high.

In addition, in the case of Example 1 using a flame retardant resin and a flour resin containing a second flour resin, it can be seen that the weight loss characteristics are the most excellent.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that the present invention, Various modifications and variations are possible.

30: sea salt 31:

Claims (13)

A first step of preparing a flour resin and a sea component resin;
Drying the island component resin and the sea component resin; And
The island-in-the-sea type conjugate fiber comprising the sea component resin as a sea component and the island component resin as a conductive component is produced by performing the combined spinning of the dried island component resin and the sea component resin Step 3:
The isobutylene resin,
A flame retardant resin comprising 90 to 99.5 mol% of a polyester and 0.5 to 10.0 mol% of a metal sulfonate; And a flame retardant comprising at least one of a nitrogen-based flame retardant and an inorganic flame retardant including phosphorus (P) at a weight ratio of 4: 1 to 14: 1,
The sea component resin may be,
A process for producing sea-island complex fibers comprising 50 to 70 mol% of a polyester, 20 to 30 mol% of an aromatic polycarboxylic acid having 6 to 14 carbon atoms, 10 to 20 mol% of a metal sulfonate, and 10 to 20 mol% Way. The method according to claim 1,
Wherein the nitrogen-based flame retardant comprises at least one member selected from the group consisting of melamine, melamine cyanurate, melamine phosphate, melamine polyphosphate, and melamine pyrophosphate,
Wherein the inorganic flame retardant comprises at least one member selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc borate, and zinc diethylphosphinate. The method according to claim 1,
Wherein the polyester is a polyethylene terephthalate (PET) resin having a weight average molecular weight of 18,000 to 22,000. The method according to claim 1,
Wherein the composite spinning is carried out at a spinning temperature of 270 to 300 占 폚 and a spinning speed of 3,000 to 5,000 mpm. The method according to claim 1,
Wherein the second step is carried out at 110 to 130 ° C for 3 to 5 hours. The method according to claim 1,
The method for producing a sea-island composite fiber according to claim 3, wherein the step (b) comprises a step of mixing the island component resin and the sea component resin at a weight ratio of 50:50 to 90:10. The method according to claim 1,
Wherein the metal sulfonate is at least one compound selected from the group consisting of dimethyl 5-sodium diisopropylphosphate, sodium 3,5-dicarbomethoxybenzenesulfonate, and dicarbomethoxybenzenesulfonate. &Lt; / RTI &gt; The method according to claim 1,
Wherein the aromatic polycarboxylic acid having 6 to 14 carbon atoms includes at least one member selected from the group consisting of terephthalic acid, isophthalic acid and dimethyl terephthalate. The method according to claim 1,
Wherein the aliphatic diol comprises an aliphatic diol having 2 to 20 carbon atoms. The method according to claim 1,
Wherein the aliphatic diol is selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, trimethyl glycol, tetramethylene glycol, pentamethyl glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol, nonamethylene glycol, And at least one member selected from the group consisting of undecamethylene glycol, undecamethylene glycol, and tridecamethylene glycol. A method of producing a sea-island composite fiber according to any one of claims 1 to 10, comprising the steps of: preparing a sea-island composite fiber; And
Alkali-reducing the islands-like conjugate fiber in the step (4). 12. The method of claim 11,
Wherein the fourth step is performed for 10 to 50 minutes at a hot water temperature of 80 to 110 ° C. In an island-in-the-sea type conjugate fiber including a sea component resin as a sea component and a cast component resin as a conductive component,
The isobutylene resin,
A flame retardant resin comprising 90 to 99.5 mol% of a polyester and 0.5 to 10.0 mol% of a metal sulfonate; And phosphorus (P), and a flame retardant comprising at least one of an inorganic flame retardant and an inorganic flame retardant, in a weight ratio of 4: 1 to 14: 1,
The sea component resin may be,
The present invention relates to a method for producing a water-dispersed sea-island complex fiber comprising 50 to 70 mol% of a polyester, 20 to 30 mol% of an aromatic polycarboxylic acid having 6 to 14 carbon atoms, 10 to 20 mol% of a metal sulfonate, and 10 to 20 mol% .

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