JP2001055648A - Elastic woven or knitted fabric excellent in flame retardance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an elastic woven or knitted fabric excellent in flame retardance and useful as a comfortable cushioning material by weaving or knitting a polyester polyether-based elastic yarn and polyester-based fiber in which phosphorus compounds are each copolymerized. SOLUTION: Weaving or knitting is carried out by using a monofilament type polyester polyether-based elastic yarn having >=200 d single fineness, <=150% breaking elongation and >=0.3 g/d stress in 10% elongation and a polyester-based fiber in which a phosphorus compound having ester group- forming ability is each copolymerized to provide the objective elastic woven or knitted fabric having >=25 kg/5 cm width breaking elongation in warp direction and weft direction and <=500 g/m2 weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knitted fabric which is lightweight, has excellent flame retardancy, and has excellent elastic properties for providing comfortable cushioning properties, and is suitable for use of cushioning materials widely used in industry. The present invention relates to an elastic knitted fabric.

[0002]

2. Description of the Related Art As a cushion material for furniture, beds, and various vehicles, urethane foam, polyester fiber-filled cotton, resin cotton or polyester cotton to which polyester fiber is adhered, and the like are conventionally used. In order to obtain comfortable performance as a cushion, many devices that have been devised, such as combining materials having different cushioning properties or forming a double structure when forming the cushion, are used. All of these cushioning materials have the problem that they are bulky or cannot be obtained with a small volume and good cushioning properties.

[0003] Furthermore, flame retardancy is very important especially in a cushion material for a vehicle or a member thereof, and it has a moderate cushioning property and a light weight as described above, and still under severe use conditions. In addition, a material having high flame retardancy has been demanded. In order to improve the flame retardancy, it is common to add a phosphorus compound to enhance the performance of the compound. However, when a long-term use such as a vehicle seat is considered, the compound migrates to the outside of the fiber over time. There has been a problem that the flame retardancy is reduced. On the other hand, in order to improve the long-term durability, for example, an attempt to copolymerize a phosphorus compound having an ester-forming group into a polyester or a polyester-based elastomer has been known. The point is that the characteristics themselves are impaired,
Specifically, it is difficult to maintain the heat resistance and the appropriate hardness required as a cushion material by lowering the crystallinity of the original polymer, and in particular, it is a polyether having relatively few crystalline components (hard segments) due to polyester. -Notable in elastomers composed of polyester block copolymer. That is, it has been very difficult to maintain the optimum hardness as a cushion material and to achieve high flame retardancy over a long period of time.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an elastic fabric,
In particular, it is an object of the present invention to provide an elastic knitted fabric which is optimal in lightweight and space-saving cushioning properties and has high flame retardancy.

[0005]

That is, the present invention provides:
Both are an elastic knitted fabric excellent in flame retardancy, characterized by comprising a polyester polyether-based elastic yarn and a polyester-based fiber copolymerized with a phosphorus compound. And specifically, the phosphorus compound has an ester group-forming ability, and the flame-retardant elastic knitted fabric as described above, which has a breaking strength in the warp and weft directions of 25 kgf / 5 cm width or more. The above-mentioned elastic knitted fabric excellent in flame retardancy and a polyetherester-based elastic yarn having a single fineness of 200
An elastic knitted fabric excellent in flame retardancy as described above, which is a monofilament having denier or more and a breaking elongation of 150% or less, characterized in that the basis weight of the knitted fabric is 500 g / m ² or less. The knitted woven fabric excellent in flame retardancy described above, wherein the stress at 10% elongation of the polyetherester elastic yarn is 0.3 g / d or more, the flame retardancy excellent in the above description. Knitted fabrics and polyetherester-based elastic yarns are mainly composed of an aromatic dicarboxylic acid as an acid component, aliphatic and / or alicyclic dihydroxy compounds as a major glycol component, and are further represented by a phosphorus compound represented by the following general formula (I): Wherein the knitted fabric having excellent flame retardancy described above is a thermoplastic polyester-based polymer containing 500 to 50,000 ppm of the above, and the phosphorus compound is represented by the following general formula (II): Textiles excellent flame retardancy of the wherein the molecular weight of the phosphorus compound is 800 or more 9000
The above-mentioned knitted woven fabric excellent in flame retardancy, characterized in that it contains a triazine compound and / or a derivative thereof in a polyetherester-based elastic yarn. A knitted fabric excellent in flammability, and a triazine-based compound and / or a derivative thereof are represented by the following general formulas (III) to
It is a knitted fabric excellent in flame retardancy as described above, which is represented by (V).

[0006]

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(Where R1 and R2 are monovalent ester-forming functional groups, R3 and R4 are the same or different groups, and are each a halogen atom, a hydrocarbon group having 1 to 10 carbon atoms, and A is Represents a trivalent or trivalent organic residue.
2 represents an integer of 0 to 4, and n represents an integer of 2 or more. )

[0008]

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(In the formula, n represents an integer of 2 or more.)

[0010]

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[0011]

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[0012]

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(Wherein R1, R2, and R3 are a hydrogen atom, an amino group, an alkyl group, an annealed group, and a phenyl group;
1, R2 and R3 may be the same or different. )

Hereinafter, the present invention will be described in detail. The polyester polyether-based elastic yarn used in the present invention is not particularly limited, but uses aromatic dicarboxylic acid and glycol as main raw materials in order to obtain the strength required for a knitted fabric for a sheet, recoverability after elongation, and the like. Is preferred. Further, a polyester elastic yarn obtained by copolymerizing polybutylene terephthalate and polytetramethylene glycol is more preferable because of its good recoverability after elongation.

It is necessary to use a polyetherester-based elastic yarn in at least one of the weft directions of the knitted fabric according to the present invention. By using the polyetherester-based elastic yarn, the recoverability after elongation can be kept good.

As the elastic yarn according to the present invention, it is effective to use, but not limited to, at least two kinds of elastic yarns having different melting points or a composite fiber in which the components are arranged in a core-sheath shape. This is because, by performing heat treatment, the elastic yarn (or sheath component) having a low melting point is melted and re-solidified while maintaining the elastic modulus of the elastic yarn having a high melting point, and the elasticity is maintained at the intersection of the knitted and woven fabric. This is because it is possible to carry out as it is. From this point of view, a system using two types of yarns is a more preferable choice in terms of performance and cost than a core-sheath type in which the flow of the low melting point component is difficult. Here, the melting point of the component having a low melting point is preferably 100 ° C. or higher from the viewpoint of spinnability or weaving. In order to melt and flow on the surface of the high melting point component to form an adhesive intersection, it is preferable to use a component having a temperature lower by 30 ° C. than the melting point of the component having a high melting point. The ratio of the component having a higher melting point to the component having a lower melting point can be arbitrarily selected, but is preferably 1: 1 to 20: 1 by weight in practical use.
More preferably it is 3: 2 to 15: 1.

The elastic yarn according to the present invention is preferably a monofilament. Even if it is a multifilament, there is no problem in mechanical properties such as recoverability after elongation, but there is a possibility that it is inferior in durability due to low resistance to friction, and inferior in light resistance, moist heat resistance and the like. The preferred range of the fineness of the monofilament is 200 denier or more and 6
It is less than 000 denier. If it is less than 200 denier, resistance to friction is low and durability such as light deterioration may not be sufficiently obtained. If it exceeds 6000 denier, handling in the production of a knitted fabric becomes difficult. A more preferable range of fineness is 500 denier or more and 4000 denier or less. As long as the denier is 100 denier or more, a plurality of monofilaments may be used, that is, a so-called mono-multi form may be used, and it is recommended to use two or more monofilaments having the above-mentioned melting point difference.

It is recommended from the viewpoint of durability and economy that the fibers used in the knitted fabric according to the present invention are polyester fibers, but a so-called urethane-based spandex yarn for the purpose of imparting more elasticity. Or use natural fibers such as nylon and cotton, for example, in terms of texture and function.
Alternatively, the composite fiber may be used. Speaking of polyester fibers, non-processed fibers, looped yarns, false twisted yarns, or a mixture of both may be used. As the yarn, a dyed yarn or a dyed yarn can be used. Among these, it is preferable to use a polyester-based yarn because all the yarns constituting the woven fabric are polyester-based and recycling is easy.

The breaking strength in the warp and weft directions of the woven fabric according to the present invention is also an important physical property as a cushioning material for a seat. This value must be at least 25kgf / 5cm width. If the breaking strength is less than 25 kgf / 5 cm width, the fabric may be broken by a load applied to the surface when used as a cushion material, which is not preferable. More preferably 35kgf /
5cm width or more.

The recovery rate after elongation of the woven fabric according to the present invention in the direction in which the polyetherester-based elastic yarn is used is preferably 95% or more. The recovery rate after elongation here is measured as follows. First, fix the upper end of the fabric, apply an initial load to the lower end so that the fabric does not loosen, and mark at intervals of 50 cm. A load is applied to the lower end of the fabric so that the length of the fabric becomes 55 cm, and the fabric is left for 24 hours. The length between marks of the woven fabric after standing for 24 hours is measured, and this is defined as L1. Next, remove the load, leave it for 3 hours, apply the initial load again, measure the length between the marks of the woven fabric after the load release after elongation,
This is L2. Using the numerical value obtained in this way,
((L1-L2) / (L1-50)) * 100 (%) is the recovery rate after elongation. If the recovery rate after elongation is less than 95%, when this woven fabric is used as a cushioning material for supporting the buttocks of a seat, once occupying the seat and standing, the woven fabric remains in a loose state, which is not preferable.

If it is necessary to impart light resistance or moisture absorption to the knitted fabric according to the present invention, it is possible to use a yarn containing a light resistant agent, or to impart it to the fabric by means such as coating. it can.

What is very important in the knitted fabric according to the present invention is the method for imparting its flame retardancy. That is, in the present invention, at least one of the fibers constituting the knitted woven fabric is provided with a polyester polyether-based elastic yarn, and both the polyester polyether-based elastic yarn and the polyester fiber share a phosphorus compound having an ester group-forming ability. It is important that the fiber is a polymerized polyester fiber. For example, a compound represented by the following formula is recommended as such a compound.

[0023]

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(Where R1 and R2 are monovalent ester-forming functional groups, R3 and R4 are the same or different groups, and are each a halogen atom, a hydrocarbon group having 1 to 10 carbon atoms, and A is Represents a trivalent or trivalent organic residue.
2 represents an integer of 0 to 4, and n represents an integer of 2 or more. That is, in the present invention, the polyetherester-based elastic yarn has an aromatic dicarboxylic acid as a main acid component, an aliphatic and / or alicyclic dihydroxy compound as a main glycol component, and further has a general formula (I) 500 phosphorus compounds shown
50,000 ppm, preferably 1,000 to 30,000
ppm, more preferably 4000 to 12000 ppm, and is a knitted fabric excellent in flame retardancy, characterized by comprising a thermoplastic polyester-based polymer.

Specifically, the above-mentioned knitted fabric excellent in flame retardancy, wherein the phosphorus compound is represented by the following general formula (II):

[0026]

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(In the formula, n represents an integer of 2 or more.)

A knitted fabric excellent in flame retardancy, wherein the phosphorus compound represented by the general formula (I) or (II) has a molecular weight of 800 or more and 9000 or less;

The above knitted fabric excellent in flame retardancy, characterized in that the polyetherester elastic yarn contains a triazine compound and / or a derivative thereof.

[0030] The knitted fabric excellent in flame retardancy described above, wherein the triazine compound and / or derivative thereof is represented by the following general formulas (III) to (V).

[0031]

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[0032]

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[0033]

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(Wherein R1, R2, and R3 are a hydrogen atom, an amino group, an alkyl group, an annealed group, and a phenyl group;
1, R2 and R3 may be the same or different. )

Here, this compound is synergistically effective in obtaining a drastic improvement in flame retardancy by copolymerizing with the ester portion of both the polyester ether elastic yarn and the polyester fiber constituting the knitted fabric. Can be.

In the present invention, it is not clear why the use of the elastic monofilament having specific mechanical properties reduces the basis weight of the entire fabric as much as possible, thereby significantly improving the flame retardancy. And found the present invention. Making the basis weight of the fabric very small is very useful from the viewpoint of reducing the weight of the cushion material itself. The causes of such low-weight articles on the flame-retardant performance reflect changes in the relative value of the air layer (oxygen amount) held in the weight of the fabric itself and the fact that the elastic yarn itself has special physical properties. It is presumed that the crystal structure and the like of the fibers have an influence, but it is not clear.

For this purpose, the basis weight of the knitted fabric is 50.
0 g / cm ² or less, preferably 400 g / cm ² or less is required. In order to maintain the required fabric strength and provide an appropriate cushioning property even at such a low basis weight, the elastic yarn used has a tensile stress at 10% elongation of 0.3 g / d or more and 1.0 g or more. / D is preferred. More preferably, it is 0.4 g / d or more and 0.8 g / d or less.
If it is less than 0.3 g / d, the strength of the fabric is not sufficient, resulting in a lack of resilience. On the other hand, when the amount is 1.0 g / d or more, the elastic yarn is inferior to ordinary polyester fiber in the cushioning property.

If it is necessary to impart color to the elastic yarn used for the elastic knitted fabric, a dye or a pigment may be contained. As the pigment, a method of adding an inorganic pigment such as a phthalocyanine-based organic pigment, carbon black, titanium oxide, or zinc oxide is known, but is not particularly limited thereto. The use of the dyed yarn containing the pigment can save the labor of dyeing.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
The present invention is not particularly limited by the examples.
The measuring method used in the examples is as follows.

(Strength of raw yarn) Based on JIS L 1013, using a constant speed elongation type testing machine, sample length 100 mm, tensile speed 100 mm
/ Min.

(Strength and elongation of fabric) Based on JIS L 1096, using a constant-speed elongation type testing machine, sample length 200 mm, test specimen width 50 m
m, measured at a tensile speed of 100 mm / min.

(Elongation recovery rate) A heating tank adjusted to a temperature of 80 ° C. was set in the above-mentioned measuring apparatus, set to a sample length of 100 mm, heated for 2 minutes, and then strained at a strain rate of 100% / min. % And immediately returned to 0% at the same rate. Ten seconds after the deformation returned, elongation deformation up to 30% was again applied at the same strain rate. At this time, the amount of strain (x%) at which stress starts to be generated by the second elongation was determined from a series of strain / stress curve records, and the elongation recovery was evaluated by the following equation. Elongation recovery rate (%) = 100-x

(Flame Retardancy) The fibers obtained in each experiment were arranged on warp yarns, and a plain woven fabric was prepared so as to have a driving density of 22 yarns / inch, and a combustion test was carried out. The flammability test was basically based on the A2 method (Meckelburner method) of JIS-L1091. That is, through the above-mentioned woven fabric, weft cut into 350 mm × 250 mm in the longitudinal direction, respectively, a combustion test of n = 5 was carried out under the same conditions as JIS, and the flame retardancy index with the longest carbonization distance of n = 10 in total did.

(Weight) 250 mm wide and 250 mm long
After taking 5 pieces of the fabric test knitted and measuring the mass of each of them and multiplying by 16, the average value is taken as the basis weight per 1 m ² (g / g / g).
m ² ).

(Example 1) Production of elastic yarn A: dimethyl terephthalate 100 mol%, 1,4-butanediol 9
7.8 mol%, poly (tetramethylene oxide) glycol having a molecular weight of about 1000, 2.2 mol%, chemical formula 2
(Wherein, n represents an integer of 2 or more) a phosphorus compound (II) having a molecular weight of 3000 [manufactured by Sanko Development Chemical Laboratory; 2- (9,10-dihydro-9-oxa-10); −
Oxide-10 phosphaphenanthren-10-yl) methyl succinate bis- (2-hydroxyethyl) -ester polymer] was added to the resulting polymer at 5000
ppm, and adding tetrabutyl titanate as a metal titanium as a catalyst to the polymer to be produced at 150 ppm, and adding 150 to 230
Transesterification was performed at ° C. Next, 0.2 parts by weight of a hindered phenol-based stabilizer [Ciba Geigy KK product; Irganox 1010] is added as a slurry of 1,4-butanediol to each of the formed oligomers, and the mixture is subjected to a pressure reduction of 3 torr or less under a reduced pressure of 230 to 250. Melt polymerization was performed at ℃ to obtain a polymer. 0.35 parts by weight of carbon black was added to this polymer using a twin screw extruder. The melting point of the obtained polymer was 205 ° C.

The obtained polymer was pre-dried for 4 hours at a degree of vacuum of 0.1 mmHG and an atmosphere temperature of 80 ° C., and then dried at 120 ° C. for 12 hours under the same vacuum conditions. The dried resin was adjusted so that the discharge rate was 17 g / min per nozzle hole (unit of monofilament), and
Discharged at 0 ° C. The discharged polymer was cooled in a water tank at about 25 ° C. provided with an air gap of 150 mm, and subsequently the first polymer was controlled at 27.5 m / min.
The film was stretched 4 times between a roller and a second roller controlled at 108 m / min through a boiling water bath controlled at 98 ° C. Subsequently, the film was taken up by a third roller while relaxing about 1% by a slit type heater 1 controlled at a temperature of 120 ° C. and a slit type heater 2 controlled at a temperature of 160 ° C., and wound up by a winder.

Production of elastic yarn B: dimethyl terephthalate 7
5 mol%, dimethyl isophthalate 25 mol%, 1,
86.7 mol% of 4-butanediol, molecular weight of about 100
0 poly (tetramethylene oxide) glycol 1
3.3 mol%, a phosphorus compound (II) having a molecular weight of 3000 represented by the chemical formula 2 (where n represents an integer of 2 or more).
[Product of Sanko Development Chemical Laboratory Co., Ltd .; bis- (2- (9,10-dihydro-9-oxa-10-oxide-10phosphaphenanthren-10-yl) methyl succinate)
-Hydroxyethyl) -ester polymer] to the resulting polymer at 5000 ppm,
As a catalyst, tetrabutyl titanate was added as titanium metal to the produced polymer so as to have a concentration of 150 ppm, and transesterification was performed at 150 to 230 ° C.
Next, a hindered phenol-based stabilizer [Ciba Geigy Co., Ltd. product; Irganox 10]
10] 0.2 parts by weight of each were added as a slurry of 1,4-butanediol, and 2 parts under a reduced pressure of 3 torr or less.
Melt polymerization was performed at 30 to 250 ° C. to obtain a polymer. 0.35 parts by weight of carbon black was added to this polymer using a twin screw extruder. The melting point of the obtained polymer was 165 ° C.

The obtained polymer was pre-dried for 4 hours at a degree of vacuum of 0.1 mmHG and an atmosphere temperature of 80 ° C., and then dried at 120 ° C. for 12 hours under the same vacuum conditions. The dried resin was adjusted so that the discharge rate was 5.6 g / min per nozzle hole (unit of monofilament),
Discharged at 75 ° C. The discharged polymer was cooled in a water tank at about 25 ° C. provided with an air gap of 150 mm, and subsequently the first polymer was controlled at 27.5 m / min.
The film was stretched 4 times between a roller and a second roller controlled at 108 m / min through a boiling water bath controlled at 98 ° C. Subsequently, the film was taken up by a third roller while being relaxed by about 1% by a slit type heater 1 controlled at a temperature of 120 ° C. and a slit type heater 2 controlled at a temperature of 150 ° C., and wound up by a winder.

Production of polyester yarn C: 1 mol of a phosphorus compound represented by the chemical formula 6 (where n is 1), 10 mol of terephthalic acid, 21 mol of ethylene glycol, and zinc acetate were added to the theoretical production amount of the copolymerized polyester. Zinc (Z
200 ppm was added as n), and the ester exchange reaction was carried out while evaporating methanol generated by elevating the temperature from 140 ° C. to 220 ° C. to the outside of the system. After completion of the transesterification reaction,
At 250 ° C., antimony oxide was converted to antimony (Sb) at 250 pp with respect to the theoretical amount of copolymerized polyester.
m, 80 ppm of trimethyl phosphate as P was added, and the mixture was stirred for 15 minutes. A polycondensation reaction was performed at 260 ° C. under vacuum for 30 minutes to obtain a polyester having an intrinsic viscosity of 0.59.

The obtained polyester was melted at 275 ° C. with a screw-type melt-extruder to obtain a hole-shaped 0.3 mm
Was spun at a take-up speed of 1300 m / min, and then stretched 2.5 times to obtain a fiber of 150 denier / 48 filaments.
The phosphorus content of the obtained fiber was 6,600 ppm.

The elastic yarn A and the elastic yarn B are alternately wefted into a total of 40 yarns / inch.
A woven fabric having a weave structure shown in FIG. 1 having a density of 40 yarns / inch was prepared. This fabric was subjected to a dry heat treatment at 190 ° C. for 2.5 minutes. Table 1 shows the physical properties and performances of the yarn and woven fabric. The reason why the warp density of the woven fabric is reduced after the dry heat treatment is that the low-melting fiber among the polyetherester-based monofilaments is melted and is not counted in the density due to the dry heat treatment.

Comparative Example 1 Polyester Yarn C of Example 1
In the production of “the phosphorus compound 1 represented by the compound (VI)
The same experiment as in Example 1 was performed except that “10 mol of terephthalic acid and 20 mol of ethylene glycol” were used instead of “10 mol of terephthalic acid and 21 mol of ethylene glycol”. In addition, the polymer used for the polyester yarn C did not copolymerize a neighboring compound at the time of polymerization, and the intrinsic viscosity of the obtained polymer was 0.63.
Table 1 shows the physical properties and performance of the yarn and the woven fabric.

(Comparative Example 2) A 1500 d polyetherester-based monofilament elastic yarn having a melting point of 222 ° C. and containing no phosphorus compound having an ester group-forming ability as the elastic yarn A was used as the elastic yarn B, and a phosphorus compound having an ester group-forming ability as the elastic yarn B was used. The same experiment as in the example was carried out except that a 500 d polyetherester monofilament elastic yarn having a melting point of 182 ° C. and containing no is used.

(Comparative Example 3) 1000d polyester yarn was used as warp yarn,
Using both wefts, a plain weave with a warp density and a weft density of 27 yarns / inch was prepared. Table 1 shows the physical properties and performances of the yarn and woven fabric.

[0055]

[Table 1]

[0056]

According to the present invention, it is possible to obtain an elastic knitted fabric having an optimum cushioning property in a lightweight and space-saving manner and having a high degree of flame retardancy.

[Brief description of the drawings]

FIG. 1 is a woven fabric woven in Example.

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 4L002 AA07 AB02 AC07 DA01 EA04 EA06 FA06 4L048 AA20 AA23 AA51 AA56 AB10 AC12 AC14 BA01 CA01 CA04 CA06 CA15 DA00 DA13 DA15 DA25 EB05

Claims (11)

[Claims] 1. An elastic knitted fabric excellent in flame retardancy, characterized by comprising a polyester polyether-based elastic yarn and a polyester-based fiber both copolymerized with a phosphorus compound. 2. The elastic knitted fabric according to claim 1, wherein the phosphorus compound has an ester group-forming ability. 3. The breaking strength in the warp and weft directions is 25 kg.
The elastic knitted fabric having excellent flame retardancy according to claim 1, wherein the width is not less than f / 5 cm. 4. A polyetherester elastic yarn having a single fineness of 2
2. The elastic knitted fabric having excellent flame retardancy according to claim 1, wherein the monofilament is a monofilament having a breaking elongation of not less than 00 denier and not more than 150%. 5. The knitted fabric having excellent flame retardancy according to claim 1, wherein the basis weight of the knitted fabric is 500 g / m ² or less. 6. The knitted fabric excellent in flame retardance according to claim 1, wherein the stress at 10% elongation of the polyetherester elastic yarn is 0.3 g / d or more. 7. A polyetherester elastic yarn comprising an aromatic dicarboxylic acid as a main acid component and an aliphatic and / or alicyclic dihydroxy compound as a main glycol component,
Further, a phosphorus compound represented by the following general formula (I) is
2. The flame-retardant knitted fabric according to claim 1, wherein the knitted fabric is made of a thermoplastic polyester polymer containing 0000 ppm. Embedded image (Wherein R1 and R2 are monovalent ester-forming functional groups, R3 and R4 are the same or different groups, and are each a halogen atom, a hydrocarbon group having 1 to 10 carbon atoms, and A is divalent or trivalent. N1 and n2 each represent an integer of 0 to 4, and n represents an integer of 2 or more.) 8. The knitted fabric having excellent flame retardancy according to claim 1, wherein the phosphorus compound of claim 7 is represented by the following general formula (II). Embedded image (In the formula, n represents an integer of 2 or more.) 9. The knitted fabric having excellent flame retardancy according to claim 7, wherein the phosphorus compound has a molecular weight of 800 or more and 9000 or less. 10. The flame-retardant knitted fabric according to claim 1, wherein the polyetherester-based elastic yarn contains a triazine-based compound and / or a derivative thereof. 11. The flame-retardant knitted fabric according to claim 10, wherein the triazine compound and / or a derivative thereof is represented by the following general formulas (III) to (V). Embedded image Embedded image Embedded image (Wherein R1, R2, and R3 are a hydrogen atom, an amino group, an alkyl group, an annealed group, and a phenyl group;
3 may be the same or different. )