KR101084492B1 - Polyamide-based Filaments for Artificial Hair and Process of Preparing the Same - Google Patents

Abstract

The polyamide fiber for artificial hair of the present invention is a resin composition obtained by mixing 5 to 20 parts by weight of a polyester resin with 100 parts by weight of a polyamide resin, 0.05 to 2.0 parts by weight of inorganic fine particles as a matting agent, and brominated epoxy compounds 10 to flame retardant. It is characterized by that it is manufactured from the composition which consists of 30 weight part. The polyester resin suitable in the present invention is preferably a resin having a low titanium oxide content, and preferably has an intrinsic viscosity in the range of 0.6 to 0.9 dl / g in consideration of melt state compatibility with PA resin. In the present invention, in order to increase the melt viscosity of the PET resin, before mixing with the nylon resin, a master batch chip in which inorganic fine particles are mixed with the PET resin in advance is then mixed with the nylon resin. The mixed resin is able to reduce the die swell generation in the melt spinning process during compounding, which enables stable fiber production.

Artificial hair, polyamide fiber, polyester, bending stiffness, curl formation, curl retention

Description

Polyamide-based Filaments for Artificial Hair and Process of Preparing the Same

Field of invention

The present invention relates to a synthetic fiber for artificial hair. More specifically, the present invention relates to a polyamide based fiber for artificial hair containing polyester having excellent bending stiffness and excellent curl formation and curl retention.

Background of the Invention

Human hair has been mainly used as a conventional wig material, but artificial hair for replacing human hair has been developed for a long time as the supply of human hair gradually decreases. Artificial hair, which is developed and used today, is a synthetic fiber made from synthetic resin, and examples thereof include polyvinyl chloride (PVC), modacryl, polyester, nylon, and polypropylene (PP). Among these materials, PVC, modacryl and PP have a low heat resistance, so hair irons or dryers cannot be used, and therefore, they cannot be mixed with human hair.

Materials that can be mixed with human hair include polyester artificial hair and polyamide artificial hair. Polyester artificial hair is excellent in heat resistance, curling property, and curl retention enough to use hair iron. Therefore, small amount of organic or inorganic fine particles are added to form protrusions on the fiber surface to reduce gloss or elute removal by alkali reduction method. It is obtained and used for artificial hair (Japanese Patent Laid-Open No. 5-86505, Japanese Patent Laid-Open No. 5-140817 and Japanese Patent Laid-Open No. 63-12716).

In addition, since the polyester resin is a flammable resin, in order to impart flame retardancy, the present inventors have already applied for a technology of mixing a brominated polymer type flame retardant with a polyester resin (Korean Patent No. 10-0714782 and 10-0577584). However, this material has a problem in that the flexural rigidity of the chemical structure is too high for stiffness and lack of flexibility, and there is a problem in that it is separated from the human hair especially when showering and bathing when mixed with human hair because there is almost no absorbency.

In order to solve this problem, a conventionally developed material is nylon artificial hair. Nylon hair is chemically structurally composed of an amide (-CONH) structure in the molecular chain, and thus has specific properties showing hydrophilicity. Nylon hair has up to 4% hygroscopicity and flexibility in the air, so it has physical properties close to human hair. On the other hand, this nylon material is used as artificial hair and has the following problems.

First, there is a disadvantage that the bending rigidity is too low to maintain a proper sense of volume when using the artificial hair.

Second, curls are formed in the steam box when the curls are formed of the metal pipe, but curls are hard to be formed in the dry box.

Third, the curls formed when forming curls with hair irons are released over time. That is, there exists a fault which curl retention is not good.

This characteristic can be said to be a big drawback for artificial hair. Even if you see already known nylon artificial hair due to other problems are still unable to develop a satisfactory nylon artificial hair.

Japanese Unexamined Patent Application Publication No. Hei 1-282309 proposes a method for controlling the flexibility of fibers by presenting artificial hairs in which polyamide (PA) resins having different bending stiffnesses are mixed, but they are difficult to use and the effect is not satisfactory.

Japanese Patent No. 3259740 discloses artificial hairs in which PA resins with different chemical structures are mixed and which have gloss close to human hair and can freely control the degree of strength and flexibility. It is difficult to put into practical use.

Korean Patent Laid-Open Publication No. 10-2007-0094661 discloses an artificial hair fiber having a sheath / core structure of a resin having different bending stiffness, which increases the manufacturing cost since the sheath core spinning equipment is required.

Japanese Patent Application Laid-Open No. 2007-332507 discloses a PA-based artificial hair fiber manufactured by dry blending organic / inorganic particle flame retardants in a manner to improve the heat resistance, feel, processing stability, flame retardancy, and gloss of PA artificial hair. However, this has been shown to be curled over time and lack of rigidity.

The inventors of the present invention have developed a polyamide fiber for artificial hair of the present invention which is excellent in volume and excellent in curl formation and curl retention by mixing polyester having high bending stiffness.

It is an object of the present invention to provide a polyamide based fiber for artificial hair that can impart proper bending stiffness when used as artificial hair.

Another object of the present invention is to provide a polyamide fiber for artificial hair with improved formability.

Still another object of the present invention is to provide a polyamide-based fiber for artificial hair having good curl retention since curls formed do not loosen well over time.

Still another object of the present invention is to provide a polyamide fiber for artificial hair having flame retardancy in addition to the above object.

The above and other objects of the present invention can be achieved by the present invention described in detail below.

Summary of the Invention

The polyamide fiber for artificial hair of the present invention is a resin composition obtained by mixing 5 to 20 parts by weight of a polyester resin with 100 parts by weight of a polyamide resin, 0.05 to 2.0 parts by weight of inorganic fine particles as a matting agent, and brominated epoxy compounds 10 to flame retardant. It is characterized by that it is manufactured from the composition which consists of 30 weight part.

The polyamide resin may be any nylon resin having a polyamide group, but a resin obtained by mixing a nylon 66 resin or a nylon 6 resin with a nylon 66 resin may be preferably used.

The polyester resin suitable in the present invention is preferably a resin having a low titanium oxide content, and preferably has an intrinsic viscosity in the range of 0.6 to 0.9 dl / g in consideration of melt state compatibility with PA resin.

As the inorganic fine particles as a matting agent for adjusting the gloss of artificial hair used in the present invention, talc, silicon dioxide, and the like are preferably used.

The flame retardant used in the present invention is preferably a high molecular weight brominated epoxy flame retardant having a number average molecular weight in the range of 20000 to 80000. This flame retardant also has the effect of improving the compatibility of the polyamide resin with the polyester resin. In addition to the flame retardant, antimony dioxide fine particles may be mixed and used as a flame retardant aid.

When the polyester resin is mixed with the nylon resin, die swell occurs in the melt spinning process, and thus the fiber cannot be stably manufactured. Therefore, in the present invention, it is necessary to increase the melt viscosity of the PET resin. In order to increase the melt viscosity of the PET resin, before mixing with the nylon resin, a master batch chip in which inorganic fine particles are mixed with the PET resin is prepared and then mixed with the nylon resin. The mixed resin is able to reduce the die swell generation in the melt spinning process during compounding, which enables stable fiber production.

Hereinafter, specific contents of the present invention will be described in detail below.

Detailed Description of the Invention

The present invention relates to a synthetic fiber for artificial hair, and relates to a polyamide fiber for artificial hair containing polyester having excellent bending rigidity and excellent curl formation and curl retention.

In the present invention, a high viscosity PET resin is mixed with nylon resin to develop a polyamide fiber for artificial hair containing polyester having excellent bending stiffness and excellent curl formation and curl retention. Because PET resin has a high molecular rigidity, when made into a nylon 66 resin and a homogeneous polymer alloy state, the support of artificial hair is improved compared to that of nylon 66 alone.

The polyamide fiber for artificial hair of the present invention is a resin composition obtained by mixing 5 to 20 parts by weight of a polyester resin with 100 parts by weight of a polyamide resin, 0.05 to 2.0 parts by weight of inorganic fine particles as a matting agent, and 10 to 30 brominated epoxy compounds as a flame retardant. It is characterized by being manufactured from the composition which consists of a weight part. In addition to the flame retardant, antimony dioxide fine particles may be mixed and used as a flame retardant aid. The resin composition is pelletized in this axial extruder, and the pellets are melt-spun to prepare fibers for artificial hair of the present invention having suitable curling properties, curl retaining properties, and bending stiffness.

Looking at each component of the resin composition of the present invention is as follows.

(A) PA resin

As the PA resin suitable for the present invention, a nylon 6 resin composed of a ring-opening polymer of caprolactam or a nylon 66 resin composed of a copolymer of hexamethylenediamine and adipic acid can be used. In the present invention, nylon 66 resin is suitable because the heat resistance temperature of the hair iron must be high and compatibility with the polyester resin is required. Melt viscosity does not significantly affect the effects of the present invention, but a resin having a high viscosity is suitable. When nylon 6 resin is mixed with nylon 66 resin, heat resistance falls, but there is no big problem in using in this invention.

(B) PET resin

The polyester resin suitable in the present invention is preferably a resin having a low titanium oxide content. In consideration of the melt compatibility with the PA resin, a resin having an intrinsic viscosity (IV) of 0.6 to 0.9 dl / g is preferable. If the intrinsic viscosity is less than 0.6 dl / g, the fiber formation is poor and the threading occurs in the spinning process, and if it exceeds 0.9 dl / g, the melt viscosity rises, so that it is difficult to uniformly mix with the nylon resin, which increases the threading in the spinning and stretching process. . As a result of the experiment in the present invention, when IV is 0.6 dl / g or less or IV is 0.9 dl / g or more, it is difficult to uniformly mix with PA resin and is not suitable for the present invention. The most preferred PET resin for the present invention is a solid phase PET resin having an IV of about 0.8 dl / g. It is preferable to use a polyester resin within 5-20 weight part of 100 weight part of polyamide resins.

Instead of the polyester, PBT (polybutylene terephthalate), PCT (polycyclohexylene terephthalate), PTT (polytrimethylene terephthalate), PEN (polyethylene naphthalate) and the like may be used. They may also be used with polyesters.

(C) inorganic fine particles

The birefringence of nylon 66 fibers is about 1.58 along the fiber axis and about 1.52 in the direction perpendicular to the fiber. When cold drawn, the gloss increases with the orientation of the molecular chain. Therefore, the gloss is lowered by adding inorganic particles.

In the present invention, a matting agent is added to reduce the gloss of PA 66 yarn to the gloss level of human hair. In general, as the quencher, silicon dioxide, talc, titanium dioxide, kaolin, and the like may be used. Preferably, silicon dioxide, talc or a mixture thereof may be used. More preferably, the silicon dioxide may have a matting effect and obtain excellent color.

The quencher preferably has an average particle diameter in the range of 0.01-1.0 μm. If the particle size is less than 0.01 ㎛ may cause agglomeration in the compounding process may increase the number of trimming in the spinning, stretching process. On the other hand, when the particle size exceeds 1.0 ㎛ is formed because a plurality of protrusions on the surface of the fiber is not suitable for application to artificial hair.

The quencher is applied in 0.05 to 2 parts by weight based on 100 parts by weight of PA resin. If the matting agent is less than 0.05, the matting effect is insufficient, and if more than 2 parts by weight, the color of the colored artificial hair becomes cloudy and a clear and beautiful color yarn cannot be obtained. In addition, the occurrence of single yarn increases during the spinning process, the projections are generated on the surface, the entanglement during combing may increase, which may be unsuitable for the artificial hair fibers. Preferably the quencher is 0.1 to 1 parts by weight based on 100 parts by weight of PA resin.

In the present invention, in addition to the components described above, conventional additives such as heat stabilizers, light stabilizers, ultraviolet stabilizers, fluorescent agents, antioxidants, antistatic agents, pigments, dyes, plasticizers, lubricants, flame retardants, flame retardant aids, and inorganic fillers may be used. It may include. The additives may be applied alone or by mixing two or more kinds.

(D) flame retardant

Since the nylon 66 resin and the PET resin in the present invention are flammable, a flame retardant for imparting self-extinguishing and anti-drip during melting is required in order to impart a function as artificial hair. Therefore, the present invention requires a flame retardant that satisfies the flame retardancy of nylon 66 resin and PET resin at the same time.

Brominated flame retardants may be used as the flame retardant, and particularly, polymeric brominated flame retardants are preferable. As the polymeric brominated flame retardant, a polybromostyrene flame retardant, a polydibromostyrene copolymer flame retardant, a brominated epoxy flame retardant, or the like may be used. In the present invention, a polymeric brominated flame retardant may be preferably applied, more preferably a brominated epoxy flame retardant or a brominated phenoxy flame retardant. The brominated epoxy flame retardant has a repeating unit of the formula:

N is in the range of 17 to 100 degree of polymerization.

Preferably, the polymeric brominated epoxy flame retardant has a number average molecular weight in the range of 20,000 to 80,000. If the number average molecular weight of less than 20,000 is used, the drip resistance may be poor. If the number average molecular weight is more than 80,000, uniform mixing with the resin may not be achieved, and thus trimming may occur during spinning and stretching. It tends to be nonuniform. More preferably, the polymeric brominated flame retardant is 25,000 to 60,000. Polyamide resins and polyester resins lack compatibility, but the addition of this flame retardant can slightly improve the compatibility of the two resins. In other embodiments, conventional polybromostyrene flame retardants and polydibromostyrene copolymer flame retardants may be used together with or in place of the brominated epoxy flame retardants. In the present invention, the flame retardant may be used in an amount of 10 to 30 parts by weight, preferably 15 to 20 parts by weight, based on 100 parts by weight of the polyester resin. When used less than 10 parts by weight, sufficient flame retardancy may not be obtained and drips may occur during combustion. In addition, when the content exceeds 30 parts by weight, uniform mixing with the nylon resin and the PET resin is not performed, and thus fiber formation is not suitable.

(E) flame retardant additives

Antimony oxide is used as a flame retardant adjuvant of the present invention. Antimony oxide includes antimony trioxide, antimony pentoxide, and the like, preferably antimony trioxide. When applying the antimony trioxide can increase the flame retardancy and drip resistance to reduce the content of the flame retardant compounded in the resin.

Antimony oxide suitable for the present invention preferably has an average particle diameter of 0.1 to 1.0 mu m. If the particle diameter of the antimony oxide is less than 0.1 µm, dispersibility may be poor. On the other hand, if the particle size of antimony oxide exceeds 1.0 μm, a plurality of protrusions are formed on the fiber surface, so that the slipperiness of the fiber surface may be lowered and the combing property may be poor.

In general, antimony trioxide for obtaining a flame retardant synergistic effect is generally known to use about 5 to 20 parts by weight based on 100 parts by weight of the resin. By the way, when antimony trioxide is added to the wig yarn in such an excessive amount, the vivid color required for the wig yarn cannot be obtained. In the present invention, antimony oxide is used 0.05 to 1 parts by weight based on 100 parts by weight of PA 66 resin. If the amount of antimony oxide is less than 0.05 parts by weight, the flame retardant effect is insufficient, and if it exceeds 1 part by weight, artificial hair of vivid color cannot be obtained. Preferably from 0.1 to 0.9 parts by weight, more preferably from 0.2 to 0.7 parts by weight.

Preparation of Artificial Hair Fibers

The polyamide fiber for artificial hair of the present invention is prepared as follows.

PA resin, PET resin, inorganic particles and flame retardant are blended to produce a resin composition in a twin screw extruder. At this time, in order to obtain a resin composition having a desired color, it may be mixed with the masterbatch chip containing the pigment. In the present invention, the resin composition thus formed is melt spun.

5 to 20 parts by weight of PET resin, 0.05 to 2 parts by weight of matting agent, 10 to 30 parts by weight of flame retardant, and 0.05 to 1.0 parts by weight of antimony trioxide are added as 100 parts to PA resin. However, the addition of flame-retardant supplements will make the feel rough and the color of the artificial hair fibers become cloudy, so be careful of the amount added.

When the polyester resin is mixed with the nylon resin, die swell occurs in the melt spinning process, and thus the fiber cannot be stably manufactured. Therefore, in the present invention, it is necessary to increase the melt viscosity of the PET resin. In order to increase the melt viscosity of the PET resin, before mixing with the nylon resin, a master batch chip in which inorganic fine particles are mixed with the PET resin is prepared, and then mixed with the nylon resin. The mixed resin is able to reduce the die swell generation in the melt spinning process during compounding, which enables stable fiber production.

The resin composition may be further subjected to a drying step before spinning. The drying is usually carried out in a nitrogen atmosphere at 80 to 180 ° C, preferably at 95 to 150 ° C, for 3 to 10 hours, preferably for 4 to 8 hours, so that the moisture content is 500 ppm or less, preferably the moisture content is 0 to 100 ppm. do.

The shape of the spinneret is not particularly limited, and for example, a circle, a peanut, a star, an oval, a hollow ellipse, or the like can be used. The cylinder temperature of the extruder for melting the resin is melted to 260 ~ 290 ℃, spinning die temperature is set to 290 ~ 300 ℃ to spin. The discharged filament yarn can be cooled and passed through the bath containing the emulsion.

The non-drawn yarn prepared as described above may further include the step of stretching in the stretching apparatus. As the stretching apparatus, a heating drum stretching apparatus may be used, but is not necessarily limited thereto. The draw ratio can be determined by measuring the physical properties of the fibers that have passed the heat treatment process, and is usually drawn at a draw ratio of 2 to 5 times.

The stretched stretched yarn may further include heat treatment in a heat treatment apparatus heated to a range of 150 to 230 ° C. The heat treatment method and the heat treatment apparatus can be applied using a conventional method, it can be easily carried out by those skilled in the art to which the present invention belongs.

The artificial hair fibers of the present invention obtained by heat treatment as described above have a fineness of 30 to 100 denier.

The artificial hair fibers of the present invention can form curls freely, and there is almost no deformation even in a beauty hot air balloon (hair aion) at 120 to 220 ° C., which is excellent in heat resistance and excellent in flame retardancy, and has almost no drip resistance and gloss similar to human hair It is also suitable for use as a wig due to its vivid color.

Another aspect of the invention provides a wig using the artificial hair fibers. The wig may be manufactured by a conventional method, and may be easily manufactured by those skilled in the art to which the present invention pertains. In one embodiment it can be produced a wig using the artificial hair fibers alone. In another embodiment may be prepared in the form of various wigs such as wigs, extensions and the like applied by mixing the artificial hair fibers and human hair.

The invention can be better understood by the following examples, which are intended for purposes of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

Examples 1-3

It blended according to the formulation prescription ratio in Table 1, it put into the biaxial compounder, and prepared the resin composition. The resin composition is as follows.

 100 parts by weight of nylon 66 (product name: Ultramid A34 01) manufactured by BASF Corporation was weighed to measure the resin composition (A) by measuring PET (product name: SB, IV 0.80 dl / g) manufactured by Huvis. As shown in Table 1 with respect to 100 parts by weight of the resin composition (A), a silicon oxide masterbatch chip or a talc masterbatch chip, a bromine-based flame retardant (CXB3000H from Woojin Polymer), and antimony trioxide (Ans-W from Ilsung Antimony) were mixed. Pellets were prepared.

The moisture content of the pellets prepared above was dried to 500 ppm or less, followed by melt spinning in a 50Φ single screw extruder. The spinneret was used with a hole diameter of 0.5 mm and an odd number of 120 holes, and the temperature of the extruder was 270 to 300 ° C and the die temperature was 280 ° C. The filament yarn to be discharged was cooled by an air cooling method and passed through a bath containing an emulsion to wind the undrawn yarn at a speed of 120 m / min. The undrawn yarn thus produced was drawn between two sets of heating rollers to obtain a drawn yarn. The draw ratio was determined by measuring the properties of the fibers that passed through the heat treatment process. At this time, the roller heating temperature was kept constant at 95 ℃ and the stretching speed was set to 20m / min. The drawn yarn was heat-treated while contacting the heated roller surface. At this time, the heating temperature of the roller was 220 degreeC and the running speed was 19 m / min.

Comparative Examples 1 to 4

It was carried out in the same manner as in Example 1 in the formulation shown in Table 1.

The physical properties of the polyamide fibers prepared according to the composition of Table 1 are shown in Table 2 below.

The measurement method and conditions of the physical properties are as follows.

(1) strength, elongation and Young's modulus

Measurement was carried out using a model LRX plus type, a tensile strength measuring instrument manufactured by Lloyd Instruments. 160 filament strands were focused to make a measurement sample. The sensing unit was equipped with a load cell of 1 kN, and the holding distance of the sample was measured at 200 mm and a tensile speed of 200 mm / min while measuring the strength, elongation, and Young's modulus. The same test was repeated five times to obtain an average value. The unit of intensity was converted into g / d, the unit of elongation was%, and the unit of Young's modulus was g / d.

(2) Curl Formability: 40,000 denier bundles of bundled yarns (160 strands × 50 denier × 5 strands) were cut into 30 cm lengths, fixed in clamps, and wound three times on an electric curler heated to 180 ° C. After holding for 5 seconds, the curling condition was removed to evaluate the curl state immediately after curl formation. Curling formability was evaluated based on the curling length of the fiber for artificial hair made from 100 parts by weight of PA 66 resin.

The curl formation properties shown in Table 2 are as follows:?: When the curl formation length of the fiber for artificial hair made from 100 parts by weight of PA 66 resin is the same, ○: 1 to 2 cm stretched relative to the standard, △: 3 to 4 relative to the standard cm stretched state, x: The state stretched more than 5 cm from the reference.

(3) Curl Retention: Cut 40,000 denier bundles of bundled yarns (160 strands × 50 deniers × 5 strands) into 30 cm lengths, fix them in a clamp, and wind them three times on an electric curler heated at 180 ° C for 5 seconds. After the curl formation, the curl sag after leaving for a certain time was evaluated. The samples were stretched in a state of not being loaded in a room with a relative humidity of 65% and 20 ° C., and the curl sag was measured after standing for 24 hours.

The curl retention shown in Table 2 is as follows: ◎: When stretched within 1 cm, ○: 2 to 3 cm stretched, Δ: 4 to 5 cm stretched, ×: 6 cm or more stretched.

(4) bending stiffness

It measured using the hair bending tester (model name KES-FB2-SH) of Kato Tech Co., Ltd. For each 1 cm example and comparative example, the parent generator was bent at a constant speed in an arc at a constant curvature to detect bending moments and to measure bending stiffness. The unit is × 10 ⁻⁵ gf · cm ² / strand.

(5) Touch: 40,000 denier bundles of bundled yarns (160 strands × 50 deniers × 5 strands) were evaluated by drying them for 2 hours at 60 ° C in a 30 cm hot air dryer and rubbing them with thumb, index finger and middle finger. The evaluation criteria were evaluated in four stages based on human hair.

The touch shown in Table 2 is as follows: ◎: Very smooth, ○: Slightly smooth, Δ: Lack of smoothness, ×: Lack of smoothness.

(6) Gloss: 40,000 denier bundles of bundled yarns (160 strands x 50 deniers x 5 strands) were cut to 10 cm in length, and the gloss was visually evaluated under sunlight.

Gloss shown in Table 2 is as follows: ◎: gloss similar to human hair, ○: gloss stronger than human hair, Δ: less gloss than human hair, ×: gloss is less than human hair and turbid.

(7) Heat resistance: 40,000 denier bundles of bundled yarns (160 strands x 50 deniers x 5 strands) are inserted between specially manufactured household electric hair irons (Recca products) heated at 220 ° C and heated for 5 seconds. The fiber deformation state by shrinkage, the deformation by fusion, etc. were visually determined. If there was no deformation after heat treatment, it was determined that the heat resistance was good, and if deformation occurred, it was determined to be defective.

The heat resistance shown in Table 2 is as follows: ◎: No deformation at all, ○: There is a slight shrinkage deformation but does not damage the appearance, △: Shrinkage occurs to damage the appearance, ×: Shrinkage deformation and fusion occurs .

(8) Flame retardant: 160 strands of yarn were cut to 15 cm, and the flame adjusted to a flame length of 2 cm was contacted for 5 seconds, and the flame was removed to determine the time of extinguishing.

The flame retardancy shown in Table 2 is as follows: ◎: within 1 second of anti-inflammatory time, ○: within 3 seconds of anti-inflammatory time, △: within 5 seconds of anti-inflammatory time, ×: above 6 seconds of anti-inflammatory time.

(9) Turbidity: 40,000 deniers (160 strands × 50 deniers × 5 strands) of bundled yarns were cut to 10 cm in length, and the turbidity was visually evaluated under sunlight.

The turbidity levels shown in Table 2 are as follows: The turbidity of the fiber composed of Comparative Example 1 made of 100% nylon resin was denoted as ◎, and the color gradually became turbid as the matting agent, the flame retardant, etc. were added. , Δ, ×.

(10) Fairness: It was determined by measuring the number of times of trimming in five hours in the spinning process.

The fairness shown in Table 2 is as follows: ◎: 0 times of trimming, ○: 1 time of trimming, △: 2-3 times of trimming, ×: 4 times or more of trimming.

The present invention can impart proper flexural rigidity when used as artificial hair, and curls are well formed when curling with a household electric iron or stove iron, and curls are not released well over time. The invention has the effect of providing a polyamide based fiber for flame retardant artificial hair.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (9)

It is produced from the composition which consists of a resin composition which mixes 5-20 weight part of polyester resins with 100 weight part of polyamide resins, 0.05-2.0 weight part of inorganic fine particles as a matting agent, and 10-30 weight part of brominated epoxy compounds as a flame retardant. Polyamide fiber for artificial hair. The polyamide based fiber for artificial hair according to claim 1, wherein the polyamide resin is nylon 66 resin, nylon 6 resin, or these are mixed resins. The polyamide fiber for artificial hair according to claim 1, wherein the polyester resin has an inherent viscosity ranging from 0.6 to 0.9 dl / g. The method of claim 1, wherein the polyester resin is PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PCT (polycyclohexylene terephthalate), PTT (polytrimethylene terephthalate), and PEN (polyethylene Naphthalate) polyamide based fiber for artificial hair, characterized in that at least one selected from the group consisting of. The polyamide based fiber for artificial hair according to claim 1, wherein the matting agent is talc or silicon dioxide. The polyamide-based fiber for artificial hair according to claim 1, wherein the brominated epoxy compound has a number average molecular weight in the range of 20000 to 80000. The method of claim 1, wherein the flame retardant polyamide fiber for artificial hair, characterized in that it further comprises a flame retardant aid. 8. The polyamide based fiber for artificial hair according to claim 7, wherein the flame retardant auxiliary agent is antimony dioxide. Preparing a masterbatch chip in which inorganic fine particles are mixed with PET resin; Preparing a basic resin by mixing the master batch chip and a nylon resin; Preparing a resin composition by mixing a matting agent and a flame retardant with the base resin; And Melt spinning the resin composition; Method for producing a polyamide based fiber for artificial hair, characterized in that it comprises a step.