KR100915458B1 - Flame retardant and low melting polyester fiber and method of making the same - Google Patents

Abstract

Flame retardant low melting point polyester fiber and a method for manufacturing the same, low melting point polyester resin having a melting point of 110 to 190 ℃ and melting point 220 ℃ to 260 ℃, a polymerized flame retardant polyester copolymerized with a flame retardant, respectively A drying step of drying each of the polymerized products through the polymerization step; a melting step of melting the dried resin in an extruder; a spinning step of spunting the melt into a sheath-core partial orientation yarn at a predesigned ratio; And It relates to a flame-retardant low melting point polyester fiber and a method for producing the same, characterized in that it comprises a stretching step imparted orientation and crystallinity to the spun partial orientation yarn.

Description

Flame retardant and low melting polyester fiber and method of making the same

The present invention provides a flame retardant low melting polyester fiber comprising a low melting point polyester resin in a sheath and a flame retardant polyester resin in a core, and a method of manufacturing the same.

In general, polyester is a generic term for a polymer compound having an ester bond (-COO) in a molecule, and there is a thermoplastic polyester resin represented by an unsaturated polyester resin, an alkyd resin, and a polyethylene terephthalate (PET).

These polyester fibers have high strength, chemical resistance, melting point in the range of 250 to 255 ° C., excellent heat resistance, and elasticity with respect to extension bending, so that they are not only used for garments such as men's clothing, shirts, but also for industrial materials. Varies.

However, the above polyester has a relatively high melting point and generally uses a formalin (formaldehyde aqueous solution) or an adhesive containing an organic solvent and a hard resin (phenol resin, melanin resin, urea resin) when curing the fiber structure. The adhesive containing such an organic solvent does not penetrate to the inside of the fabric, so the adhesiveness is low and the touch when finished is rough. In addition, most of the substances are highly volatile and harmful to the human body, and have been an environmental problem such as toxic gas emissions.

The present invention is a polyester fiber of the sheath-core structure developed by the conjugate technology, heat dissipation and moldability by dissolving only the sheath portion of the yarn made of the sheath-core structure by heat treatment (160 ~ 200 ℃) While also ensuring strength, there is a feature that can be exhibited with the flame retardancy of the core.

Such a safe environment-friendly material is a material that can express the same effect only by heat treatment without using a solvent that affects the human body.It is used for various purposes until now, and it is expected to develop new applications in the future. It is an ester fiber.

In particular, in the above fiber, the filament form is glossy on the surface, has a slippery feel, and is made of synthetic filament processed yarn using the thermoplastic properties of the synthetic fiber to have various shapes such as crepe. have.

Therefore, the filament can be processed from high-quality products that can have characteristics such as dogs, and can be applied to a variety of industrial roads as well as practical fields.

On the other hand, the provision of flame retardancy is generally made through post-processing, but this has a disadvantage in that the process is complicated and the cost is increased, and the raw material itself, which includes flame retardancy, has a post-processing time in terms of shortening of the process and expression of effects and durability. All is much better.

Accordingly, US Patent No. 5990213 proposes that a flame retardant polyester resin composition composed of a polyester resin including polyalkylene oxide and a brominated flame retardant component exhibits low melting point viscosity, high flowability, improved strength, and thermal properties. have.

However, the bromine-based flame retardant component has a disadvantage of causing environmental problems due to the generation of carcinogens such as dioxins when incinerated, and in recent years, halogen-based flame retardant substances have been reduced.

In addition, Japanese Laid-Open Patent Publication No. 2004-190161 relates to a polyester flame retardant laminated nonwoven fabric and a filter using the same, wherein one surface is a flame retardant polyester nonwoven fabric, and the other layer has a sheath portion of a low melting point polyester, and a core portion. Laminated nonwoven fabric of cis-core type composite fiber made of general polyester has been proposed, but the expression effect of the flame retardant component is limited to only one side, which has a disadvantage in that the flame retardant effect is limited.

In Japanese Laid-Open Patent Publication No. 2006-233358, as a reinforcing material for an air filter, a low melting point polymer is formed in the sheath portion, a core portion is formed of a high melting point polymer, and the sheath-core type composite short fibers are entangled with each other to form a low melting point polymer. As a reinforcing material for air filter lumber, which is bonded according to fusion, it does not use a flame retardant, and when a flame approaches a non-woven fabric made of short fibers, it is transmitted in the axial direction of the fiber, making it difficult to burn, and the low melting polymer melts or softens. It has the effect of preventing combustion.

However, the above invention is a raw material applied only to the non-woven fabric for the air filter made of short fibers, the flame retardancy is satisfactory to the reinforcing material for the air filter, it is difficult to expect a variety of other compatibility.

In addition to the above examples, Japanese Laid-Open Patent Publication No. 2004-107860 discloses a low-melting polyester having a glass transition point of 25 to 70 ° C, a crystal initiation temperature of 80 to 120 ° C, and a melting point of 140 to 190 ° C in a sheath with a main repeating unit of alkyl. It is a sheath-core composite fiber in which a polyester, which is a terephthalate, is disposed on a core part, and a heat-adhesive core sheath-type composite short fiber capable of obtaining a nonwoven fabric having excellent flame retardancy, heat adhesiveness, heat resistance, and soft touch, and such properties. Short fiber nonwoven fabrics have been proposed.

However, the above invention is limited only to the short fiber nonwoven fabric and it is difficult to express the touch that can be exerted on the long fiber.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a flame retardant low melting polyester fiber comprising a low melting point polyester resin in a sheath part and a flame retardant polyester resin in a core part thereof, and a method of manufacturing the same. .

In addition, by using a heat-adhesive resin and a phosphorus-based flame retardant to provide an environmentally friendly raw material.

Another object of the present invention is to provide a flame retardant low melting point polyester fiber having a high flame retardant effect and having a durable flame retardancy even after washing by using a reactive flame retardant copolymerizing a polyester and a flame retardant.

In addition, by manufacturing in the form of polyester filament, flame-retardant low-melting point polyester fiber that can be applied not only for clothing but also for interior products such as wallpaper, blinds, curtains, etc. that require flame retardancy, furniture materials, building materials, automobile interior materials, etc. It is to provide a method for producing the same.

In order to achieve the above object, the present invention is a flame-retardant low-melting-point polyester fiber, low melting point polyester resin having a melting point of 110 to 190 ℃ in the sheath portion, melting point of 220 ℃ to 260 ℃ in the core portion, flame retardant It provides a flame retardant low melting point polyester fiber characterized in that it comprises a flame-retardant polyester resin copolymerized with.

In addition, the present invention provides a flame retardant low-melting polyester fiber, characterized in that the flame retardant is a general formula (1) as a phosphorus-based flame retardant.

[Formula 1]

However, R <_1> and R <_2> is a C1-C18 alkyl group, an aryl group, a monohydroxy alkyl group, or a hydrogen atom, and R <_3> is a C1-C18 alkyl group and an aryl group. In addition, n is an integer of 1-4.

The present invention also provides a flame retardant low melting polyester fiber, characterized in that the phosphorus flame retardant includes 5,000 ppm to 10,000 ppm of phosphorus atom (P) in the polyester resin.

The present invention also provides a flame retardant low melting polyester fiber, characterized in that a copolymerization component, a matting agent, a colorant or a lubricant is added to the flame retardant polyester resin.

In addition, the present invention provides a flame retardant low-melting polyester fiber, characterized in that the matting agent is added to the titanium dioxide (TiO ₂ ) and 0.01 to 2.5 parts by weight based on the polyester resin 100.

The present invention also provides a flame retardant low melting polyester fiber, characterized in that the ratio of the sheath portion to the core portion is 10:90 to 30: 70% by weight.

In addition, the present invention is a flame-retardant low-melting polyester fiber manufacturing method, a low-melting polyester resin having a melting point of 110 to 190 ℃ and a melting point of 220 to 260 ℃, copolymerized with a flame retardant flame-retardant polyester Polymerizing step of polymerizing each; Drying step of drying each polymerized product through the polymerization step; Melting step of melting each of the dried resin in an extruder; Composite spinning in a cis-core type partial orientation yarn at a pre-designed ratio Spinning step; And it provides a method for producing a flame-retardant low melting polyester-based fiber, characterized in that it comprises a stretching step of imparting orientation and crystallinity to the spun partial orientation yarn.

In addition, the present invention provides a method for producing a flame retardant low melting polyester fiber, characterized in that the flame retardant is a phosphorus-based flame retardant includes the following formula (1).

[Formula 1]

However, R <_1> and R <_2> is a C1-C18 alkyl group, an aryl group, a monohydroxy alkyl group, or a hydrogen atom, and R <_3> is a C1-C18 alkyl group and an aryl group. In addition, n is an integer of 1-4.

The present invention also provides a method for producing a flame retardant low melting polyester fiber, wherein the phosphorus flame retardant has a phosphorus atom (P) of 5,000 ppm to 10,000 ppm in the polyester resin.

The present invention also provides a method for producing a flame retardant low melting polyester fiber, characterized in that a copolymerization component, a matting agent, a colorant or a lubricant is added to the flame retardant polyester resin.

The present invention also provides a method for producing a flame retardant low melting polyester fiber, wherein the matting agent is titanium dioxide (TiO ₂ ) and is added in an amount of 0.01 to 2.5 parts by weight based on 100 polyester resins.

In addition, the present invention provides a method for producing a low melting polyester fiber, characterized in that the ratio of the sheath portion to the core portion in the spinning step of the sheath-core type composite spinning 10:90 to 30: 70% by weight. .

The present invention also provides a method for producing a flame retardant low melting polyester fiber, characterized in that the winding speed in the spinning step is 3,000 to 3,500 m / min.

In addition, the present invention provides a method for producing a flame-retardant low melting polyester fibers, characterized in that the stretching ratio in the stretching step is 1.5 to 2.0, the stretching speed is wound to 700 to 1,500 m / min.

In addition, the present invention is a flame-retardant low-melting polyester fiber manufacturing method, a low-melting polyester resin having a melting point of 110 to 190 ℃ and a melting point of 220 ℃ to 260 ℃, a flame-retardant polyester copolymer copolymerized with a flame retardant Polymerization step of polymerizing each; Drying step of drying each polymerized product through the polymerization step; Melting step of melting each of the dried resin in an extruder; Stretching the melt at the same time in the pre-designed ratio to the sheath-core type It is made to provide a method for producing a flame-retardant low melting polyester-based fiber, characterized in that it is produced, including the spinning and drawing step is made for the drawn yarn.

In addition, the present invention provides a method for producing a flame retardant low melting polyester fiber, characterized in that the flame retardant is a phosphorus-based flame retardant includes the following formula (1).

[Formula 1]

However, R <_1> and R <_2> is a C1-C18 alkyl group, an aryl group, a monohydroxy alkyl group, or a hydrogen atom, and R <_3> is a C1-C18 alkyl group and an aryl group. In addition, n is an integer of 1-4.

The present invention also provides a method for producing a flame retardant low melting polyester fiber, wherein the phosphorus flame retardant has a phosphorus atom (P) of 5,000 ppm to 10,000 ppm in the polyester resin.

The present invention also provides a method for producing a flame retardant low melting polyester fiber, characterized in that a copolymerization component, a matting agent, a colorant or a lubricant is added to the flame retardant polyester resin.

The present invention also provides a method for producing a flame retardant low melting polyester fiber, wherein the matting agent is titanium dioxide (TiO ₂ ) and is added in an amount of 0.01 to 2.5 parts by weight based on 100 polyester resins.

In addition, the present invention provides a method for producing a low melting polyester fiber, characterized in that the ratio of the sheath portion to the core portion in the spinning step of the sheath-core type composite spinning 10:90 to 30: 70% by weight. .

In addition, the present invention provides a method for producing a flame-retardant low-melting polyester fiber, characterized in that in the spinning and stretching step, the draw ratio is 3.0 to 4.0, the winding speed is 4,000 to 4,500 m / min.

In addition, the present invention provides a fabric, characterized in that made of the flame-retardant low melting point polyester fiber and the method of producing the flame-retardant low melting point polyester fiber.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values as are indicative of preparation and material tolerances inherent in the meanings mentioned, and are intended to be accurate or to facilitate understanding of the invention. Absolute figures are used to prevent unfair use by unscrupulous infringers.

The present invention is a heat-adhesive sheath-core flame retardant polyester fiber, the sheath portion may be made of a low melting point polyester resin component, the core portion of a flame retardant polyethylene terephthalate resin component.

1 is a first process chart for manufacturing a flame retardant low melting polyester-based fiber according to an embodiment of the present invention.

Referring to Figure 1, the flame-retardant low-melting point polyester fiber is a low-melting point polyester-based resin to be a sheath portion and a flame-retardant polyester-based resin to be a core portion, respectively, after the polymerization step, drying step and melting step, Both components can be prepared together via a spinning step and a stretching step.

As a specific example of the said polyester-type resin, polyethylene terephthalate and polybutylene terephthalate are preferable, and polyethylene terephthalate is more preferable especially since it is cheap and general purpose.

First, in the polymerization step of the low-melting-point polyester resin of the sheath portion, it can be produced by copolymerization by esterification and condensation polymerization of the acid component and the alcohol component.

The acid component is terephthalic acid, phthalic anhydride, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid, azelaic acid, dodecanedicarboxylic acid, 1,4- At least one selected from the group consisting of cyclohexanedicarboxylic acid.

In addition, the alcohol component is ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol, 1,4-cyclohexanediol, 1,4 At least one selected from the group consisting of cyclohexanedimethanol.

In particular, in the polymerization component, a copolymerized polyethylene terephthalate composed of terephthalic acid and isophthalic acid component as an acid component and ethylene glycol and diethylene glycol component as an alcohol component is preferable from the viewpoint of cost and handleability.

Therefore, since the melting point can be changed by adjusting the copolymerization ratio of the acid component and the alcohol component, a polyester resin having a low melting point can be designed.

It is preferable that the said low melting polyester resin is a polyester resin whose melting | fusing point is 110-190 degreeC as a heat bonding component.

When the melting point is less than 110 ° C, the fibers are easily interlocked in the subsequent stretching step, the dimensional stability of the fiber produced is insufficient, and when it exceeds 190 ° C, the adhesiveness and heat adhesion at low temperatures are deteriorated.

On the other hand, in the polymerization step of the flame-retardant polyester-based resin to be the core portion, it is carried out by conventional polyester condensation polymerization, it can be copolymerized by adding a phosphorus-based flame retardant represented by the formula (1) during the polymerization.

[Formula 1]

However, R <_1> and R <_2> is a C1-C18 alkyl group, an aryl group, a monohydroxy alkyl group, or a hydrogen atom, and R <_3> is a C1-C18 alkyl group and an aryl group. In addition, n is an integer of 1-4.

The phosphorus flame retardant is not limited when the polyester resin polymerization is added, the content is preferably 5,000 to 10,000 ppm phosphorus atom (P) in the polyester resin. When added so that the phosphorus content is less than 5,000 ppm, the flame retardant effect is insignificant, and if it exceeds 10,000 ppm, the melt viscosity of the polyester-based resin is lowered, there is a problem that the workability and physical properties during spinning.

The flame retardant polyester resin is preferably a polyester resin having a melting point of 220 ° C. to 260 ° C. as a fiber forming component.

When the melting point is less than 220 ℃ not only difficult to stably composite fibers, the stability during the heat adhesion treatment is lowered, if it exceeds 260 ℃ there is a disadvantage that the radioactivity is lowered.

Moreover, a small amount of copolymerization components, additives, such as a matting agent, a coloring agent, and a lubricating agent, may be contained in the range which does not impair the flame-retardant property mentioned above.

Therefore, in the present invention, the flame-retardant polyester resin Titanium dioxide (TiO ₂ ) may be added as the matting agent, and the addition content is preferably added in an amount of 0.01 to 2.5 parts by weight based on the polyester resin 100 within a range that does not prevent the flame retardant effect.

Each polymer that has undergone the polymerization step is subjected to a drying step, which prevents the polymer from lowering in molecular weight due to hydrolysis when heated to a high temperature in the mixing and subsequent spinning steps of the polymer.

In particular, the drying step of the flame-retardant polyester-based resin to which titanium dioxide is added may be carried out in the pre-drying and the main drying step, the pre-drying of about 2 to 3 hours at 100 to 120 ℃, and 4 to 140 to 180 ℃ This drying is performed for 8 hours, and this is to preliminarily crystallize the surface of the polymer by preliminary drying so as not to form agglomerates due to the polymer adhering to each other when rapidly entering a high temperature.

Each dried product passed through the drying step is fed to each extruder to be compressed, defoamed or melted.

Subsequently, each uniform melt that has undergone the above melting step is subjected to complex spinning through a spinneret through a filtration to remove foreign matter that is a dead point in the spin block, and then wound up to produce fibers. Can be.

When the composite spinning proceeds, any one of the composite type may be taken from the sheath-core type, the eccentric sheath-core type, the side by side type, the island-in-sea type, and the island-type type.

In particular, in the composite spinning, it is preferable that the low melting point polyester resin melt proceeds to the sheath-core composite spinning made of a flame-retardant polyester resin melt in the core part.

In the sheath-core type, the ratio of the sheath to the core portion is preferably in a ratio of 10:90 to 30: 70% by weight.

When the sheath portion is less than 10% by weight, the thermal adhesion performance is lowered. When the sheath portion is more than 30% by weight, the content of the core portion is reduced too much, so that the fiber properties of the polyester are significantly reduced, and the flame retardant properties are difficult to exhibit.

Various fibers are produced according to the winding speed in the spinning step. Partially Oriented Yarn (POY) having a winding speed of 3,000 to 3,500 m / min in the spinning step of the present invention is preferably manufactured.

Partially aligned yarns undergoing the spinning step are further oriented, crystallized, and homogenized through the stretching step to complete the final fiber having practical strength.

In the stretching step, the stretching ratio is 1.5 to 2.0, the stretching speed is preferably wound to 700 to 1,500 m / min.

When the draw ratio is less than 1.5, the dimensional stability of the fiber structure is lowered, and when the draw ratio is higher than 2.0, the stretchability is not only deteriorated but also the thermal adhesiveness is not preferable.

In the above drawing speed, if less than 700 m / min, non-uniformity of the fineness is caused and undrawn yarn is produced, if it exceeds 1,500 m / min may cause the trimming.

On the other hand, by proceeding with the stretching in the spinning step, it may proceed by omitting the stretching step.

Figure 2 is a second process chart for the production of flame-retardant low melting polyester-based fibers according to an embodiment of the present invention.

Referring to Figure 2, the flame-retardant low-melting polyester fiber is a low-melting-point polyester resin to be a sheath portion and a flame-retardant polyester-based resin to be a core portion, respectively, after the polymerization step, drying step and melting step, Both components can be prepared together through a spinning and stretching step.

The polymerization step, the drying step and the melting step are carried out in the same manner as in the manufacturing process shown in FIG. 1, but in the spinning and stretching step is carried out as follows.

In the spinning step, the draw ratio is 3.0 to 4.0, the winding speed is preferably drawn yarn (Spin-Draw Yarn; SDY) of 4,000 to 4,500 m / min.

When the draw ratio is less than 3.0, the morphological stability due to non-uniform stretching is lowered, and when the draw ratio is higher than 4.0, the drawability is deteriorated, which causes defects, which is not preferable.

In the above winding speed, the elongation deteriorates when it is less than 4,000 m / min, and when it exceeds 4,500 m / min, it may cause trimming.

In the spinning and stretching step, when the spinning step and the stretching step at the same time, there is an advantage that the manufacturing time of the drawn yarn is shortened, it can be selected and progressed according to the required use and spinning conditions finally.

The flame-retardant low-melting polyester fiber completed through the above steps is not only given excellent touch when applied to clothing, but also interior products such as wallpaper, blinds, curtains, furniture, building materials, automobile interior materials, etc. When applied to a variety of applications of the flame retardancy with the application of heat without the need for a special adhesive in the adhesive is melted and bonded to the sheath is provided to shorten the process and convenience, there is an advantage in terms of environmental aspects.

An embodiment according to a preferred embodiment of the present invention is as follows.

Example  One

(Polymerization stage)

1) cis part polymerization step; Low melting point polyester resin

In a low melting point polyethylene terephthalate polymerization method, a low melting point polyethylene terephthalate resin having a melting point of 175 ° C. was prepared in the form of a chip.

2) core portion polymerization step; Flame Retardant Polyester Resin

6,500 ppm of a phosphorous flame retardant represented by the formula (1) was added by a conventional condensation polymerization method, and 0.3 parts by weight of titanium dioxide based on polyethylene terephthalate 100 was added to polyethylene terephthalate having an intrinsic viscosity of 0.66 dl / g. The resin was prepared in the form of chips.

(Drying step)

1) sheath drying

The low melting polyethylene terephthalate chip polymerized by the above method was dried under reduced pressure.

2) Core part drying

The flame-retardant polyethylene terephthalate chip polymerized by the above method was preliminarily dried at 100 ° C. for 3 hours, and then dried at 170 ° C. for 6 hours.

(Melting step)

The flame retardant polyethylene terephthalate and low melting point polyethylene terephthalate chips, respectively dried above, were charged to each extruder and melted.

(Radiation step)

The melt melted above was filtered at the spin head, respectively, and then fed to a cis-core melt composite spinning device, and the partial drawn yarn was wound at a winding speed of 3,000 m / min at a ratio of 25:75 wt% of the sheath part to the core part. Prepared.

(Stretching stage)

The partially drawn yarn spun above was drawn at a draw ratio of 1.9 and a drawing speed of 850 m / min in a conventional drawing facility to complete a flame retardant low melting polyester fiber.

Comparative Example 1

As in Example 1, no phosphorus-based flame retardant was added in the polymerization step of the core portion.

Test Methods

Melting Point (Tm)

It measured at the temperature increase rate of 10 degree-C / min using the differential scanning calorimeter DSC-7 type | mold by the Perkin Elmer company.

2. Intrinsic viscosity [η]

It measured at 25 degreeC with orthochlorophenol as a solvent.

3. Measurement of strength and elongation

When the fineness was rotated once, a 1m skein was wound 90m in weight, and converted to 9000m to measure strength and elongation. The strength and elongation of the fibers were measured using an automatic tensile tester (Textechno, Inc.) at a rate of 50 cm / min and a gripping distance of 50 cm.

4.Limiting Oxygen Index (LOI)

In order to evaluate a flame retardance, it measured based on KS-M ISO 4589-1-3 or JIS K7201 A-1.

division Strength (g / de`) Elongation (%) LOI Example 1 4.6 ~ 4.8 30-32 28 Comparative Example 1 4.8 ~ 5.0 30-32 22

As shown in Table 1, the flame retardant low melting polyester fibers of Example 1 exhibited similar strength and elongation to the fibers that did not contain the flame retardant of Comparative Example 1, and showed excellent results in LOI.

Flame-retardant, flame-retardant fibrous material is generally shown to have a LOI (Limit Oxygen Index) value of 27 or more, and is suitable for use as a flame retardant material in accordance with the flame retardant low melting polyester fibers produced in the present invention.

As described above, a flame retardant low melting polyester fiber and a method for manufacturing the same according to an embodiment of the present invention are flame retardant low melting polyester including a low melting polyester resin in a sheath part and a flame retardant polyester resin in a core part. It is effective in having flame retardancy and heat adhesiveness simultaneously as a system fiber.

In addition, there is an environmentally friendly effect by using a heat-adhesive resin and a phosphorus-based flame retardant.

In addition, the present invention has a high flame retardant effect by using a reactive flame retardant copolymerizing a polyester-based resin and a flame retardant, there is an effect that the durability that the flame retardancy persists even after washing.

In addition, it is manufactured in the form of polyester filament, which not only provides excellent touch when applied to clothing, but also can be applied to various applications such as interior products such as wallpaper, blinds, curtains, furniture, building materials, automobile interior materials, etc. It can be effective.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

1 is a first process chart for the production of flame retardant low melting polyester-based fibers according to an embodiment of the present invention.

Figure 2 is a second process chart for the production of flame-retardant low melting polyester-based fibers according to an embodiment of the present invention.

Claims (22)

delete delete delete delete delete delete In the method for producing a flame retardant low melting polyester fiber, A polymerization step of polymerizing a low melting polyester resin having a melting point of 110 to 190 ° C. and a flame retardant polyester having a melting point of 220 ° C. to 260 ° C. and copolymerized with a flame retardant; A drying step of drying each of the polymerized products having undergone the polymerization step; A melting step of melting the dried resin in an extruder; Spinning the melt in a pre-designed proportion into a cis-core partial orientation yarn; And Method for producing a flame-retardant low melting polyester-based fiber, characterized in that it comprises a stretching step of imparting orientation and crystallinity to the spun partial orientation yarn. The method of claim 7, wherein The flame retardant is a phosphorus-based flame retardant method of producing a flame retardant low melting point polyester fiber, characterized in that the following formula (1). [Formula 1] However, R <_1> and R <_2> is a C1-C18 alkyl group, an aryl group, a monohydroxy alkyl group, or a hydrogen atom, and R <_3> is a C1-C18 alkyl group and an aryl group. In addition, n is an integer of 1-4. The method of claim 8, The phosphorus flame retardant is a method for producing a flame retardant low melting polyester fiber, characterized in that the phosphorus atom (P) in the polyester resin is 5,000 ppm to 10,000 ppm. The method of claim 7, wherein A method for producing a flame retardant low melting polyester fiber, characterized in that a copolymerization component, a matting agent, a colorant or a lubricant is added to the flame retardant polyester resin. The method of claim 10, The matting agent is titanium dioxide (TiO ₂ ) and the method for producing a flame retardant low melting point polyester fiber, characterized in that added to 0.01 to 2.5 parts by weight based on the polyester resin 100. The method of claim 7, wherein The method for producing a low melting polyester fiber, characterized in that the ratio of the sheath portion to the core portion in the spinning step of the sheath-core type composite spinning 10:90 to 30: 70% by weight. The method of claim 7, wherein The winding speed in the spinning step is 3,000 to 3,500 m / min method for producing a flame-retardant low melting point polyester fiber. The method of claim 7, wherein The stretching ratio in the stretching step is 1.5 to 2.0, the stretching speed is a method for producing a flame-retardant low melting polyester fiber, characterized in that the winding is 700 to 1,500 m / min. In the method for producing a flame retardant low melting polyester fiber, A polymerization step of polymerizing a low melting polyester resin having a melting point of 110 to 190 ° C. and a flame retardant polyester having a melting point of 220 ° C. to 260 ° C. and copolymerized with a flame retardant; A drying step of drying each of the polymerized products having undergone the polymerization step; A melting step of melting the dried resin in an extruder; Method for producing a flame-retardant low-melting polyester fiber, characterized in that the melt is prepared in a pre-designed ratio to the spinning in the sheath-core-type at the same time, including the spinning and stretching step that is drawn yarn. The method of claim 15, The flame retardant is a phosphorus-based flame retardant method of producing a flame retardant low melting point polyester fiber, characterized in that the following formula (1). [Formula 1] However, R <_1> and R <_2> is a C1-C18 alkyl group, an aryl group, a monohydroxy alkyl group, or a hydrogen atom, and R <_3> is a C1-C18 alkyl group and an aryl group. In addition, n is an integer of 1-4. The method of claim 16, The phosphorus flame retardant is a method for producing a flame retardant low melting polyester fiber, characterized in that the phosphorus atom (P) in the polyester resin is 5,000 ppm to 10,000 ppm. The method of claim 15, A method for producing a flame retardant low melting polyester fiber, characterized in that a copolymerization component, a matting agent, a colorant or a lubricant is added to the flame retardant polyester resin. The method of claim 18, The matting agent is titanium dioxide (TiO ₂ ) and the method for producing a flame retardant low melting point polyester fiber, characterized in that added to 0.01 to 2.5 parts by weight based on the polyester resin 100. The method of claim 15, The method for producing a low melting polyester fiber, characterized in that the ratio of the sheath portion to the core portion in the spinning step of the sheath-core type composite spinning 10:90 to 30: 70% by weight. The method of claim 15, In the spinning and stretching step, the draw ratio is 3.0 to 4.0, the winding speed is 4,000 to 4,500 m / min method for producing a flame-retardant low melting point polyester fiber. A fabric comprising the flame retardant low melting point polyester fiber of any one of claims 1 to 6 and the method for producing the flame retardant low melting point polyester fiber of any one of claims 7 to 21.