JPH06287807A - Drawn polyamide fiber for artificial hair - Google Patents

Abstract

PURPOSE:To obtain the subject high-strength fibers having human hairlike gloss and free to design hardness thereof, by melt spinning process. CONSTITUTION:The objective drawn polyamide fibers for artificial hair comprises 10-100 pts.wt. of (A) a polyamide containing >=70mol% of amide structural units produced by polycondensation between m-xylylenediamine and adipic acid in 100 pts.wt. of a mixed polyamide composed of the polyamide A and (B) another polyamide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyamide fiber which can be preferably used for artificial hair.

[0002]

2. Description of the Related Art Generally, polyamide fibers are often used as artificial hair for wigs and the like. Since the polyamide-based fibers used for artificial hair are usually produced by a melt spinning method, the surface thereof is extremely smooth and has a high glossiness and exhibits so-called specular gloss. Natural hair has a scaly surface structure called cuticle, and this shape diffusely reflects the light hitting the hair, and as a result, suppresses gloss. In the fiber for artificial hair, efforts have been made to suppress the specular gloss of the surface of the fiber for artificial hair in order to make the gloss as close as possible to natural hair. For example, when producing artificial hair using nylon 6 as the main raw material, the raw material is 28
Melt-spin at 0-300 ° C., then spin 60
Immerse in warm water of ~ 100 ° C and gradually cool over about 1 second.

This operation reduces the surface smoothness due to the formation of spherulites on the surface of the resin, and when this is subjected to a stretching step, a surface structure having an uneven shape with the same size as the cuticle is obtained. The polyamide fiber having can be obtained. However, such a method has a problem that the spinning / drawing process becomes complicated and the fiber is difficult to produce. In particular, the generation of spherulites made workability in the stretching process difficult. In addition, synthetic hair made of synthetic polymer is more uniform than natural hair, and the hardness of artificial hair is almost determined by the type of synthetic polymer used, and manufacturing conditions such as spinning and drawing are changed. However, it was difficult to control the hardness.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a fiber for artificial hair which has human hair-like luster, high strength and hardness which can be freely set by a usual melt spinning method. To aim.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that the above problems can be solved by blending a specific polyamide in a certain proportion or more in the fibers to be used, and have completed the present invention. It was That is, the present invention is based on 100 parts by weight of a mixed polyamide comprising a polyamide (A) containing 70 mol% or more of an amide structural unit formed by a polycondensation reaction of metaxylylenediamine and adipic acid and another polyamide (B). To 10 parts of polyamide (A)
The present invention relates to a stretched polyamide fiber for artificial hair, which comprises 100 parts by weight.

The polyamide (A) used in the present invention is a polyamide or a polyamide copolymer containing 70 mol% or more of amide structural units formed by polycondensation of metaxylylenediamine and adipic acid. When the amide structural unit in the polyamide (A) is less than 70 mol%, properties such as low gloss, high strength and appropriate Young's modulus when the polyamide (A) is used as a fiber are impaired. As the polyamide (B), an aliphatic polyamide such as nylon 6, nylon 66, nylon 666, nylon 1 is used.
2, nylon 46, nylon 610 and nylon 612 can be exemplified, but it is preferable that the Young's modulus of the fiber is lower than that of polyamide (A). The reason is that there is a difference in hardness between natural hairs and the Young's modulus of artificial hair made of polyamide (A) is higher than that of natural hair. Therefore, polyamide having a Young's modulus lower than that of polyamide (A) is used. This is because it is necessary to blend (B) at an appropriate compounding ratio to handle differences in solids.

The polyamide (A) in 100 parts by weight of the mixed polyamide of the present invention is 10 parts by weight or more, preferably 4 parts by weight.
It is necessary to make it 0 part by weight or more. When the mixing ratio of the polyamide (A) is less than 10 parts by weight, it becomes difficult to suppress the gloss of the surface of the obtained fiber, and the polyamide (A) has high strength and high Young's modulus. Is not sufficiently observed. The polyamide resin used in the present invention includes a heat-resistant agent, a coloring preventing agent, a crosslinking preventing agent,
It is also possible to use a combination of inorganic and organic compounds such as a light resistance agent, a pigment, an antistatic agent, and a flame retardant. The cross-sectional shape of the fiber of the present invention is not particularly limited, but it is usually a round or flat cross-sectional shape.

The following method can be exemplified as one preferable specific example of the embodiment of the present invention. Polyamide (A) and other polyamide (B) are mixed polyamide 1
After blending so that the polyamide (A) in 100 parts by weight becomes 10 to 100 parts by weight, melt spinning is performed using a usual screw type extruder. At this time, the polyamide (A) and the polyamide (B) are blended in an appropriate ratio in consideration of the thickness and hardness of the obtained fiber. In melt spinning, the spinning temperature is 245 to 300 ° C., spinning is performed through a spinneret, and the solution is drawn into a hot water bath at 10 ° C. or higher or an organic solvent bath having a liquid level within 2.0 m below the spinneret surface.
After cooling and once winding to obtain an unstretched fiber, or continuously without winding once, 2
Stretching is performed in multiple stages or more, and then relaxation heat treatment is performed at a relaxation rate of 2 to 15%.

As the liquid in the liquid bath, water, glycerin,
Liquid paraffin, silicone oil, hydrocarbon oil, polyethylene glycol, diethylene glycol and the like are used. The stretching is a multi-stage stretching of two or more stages,
An ordinary stretching means such as a dry hot air bath, a hot water bath, a steam bath, an organic solvent bath, or the like can be used. The first stage draw ratio is 2.
About 0 to 5.0 times, and the draw ratio after the second stage is 1.1 to
It is desirable that the total draw ratio is 2.5 to 10 times at about 2.0 times. By setting the draw ratio to 2.5 or more, problems such as winding around a roller due to a decrease in the tension of fibers during running during drawing can be solved, and a decrease in productivity can be prevented. Further, by setting the draw ratio to 10 times or less, problems such as fiber breakage due to too high tension can be solved.

The first stage drawing temperature is a water temperature of 60 ° C. or higher when a hot water bath is used, and 85 to 13 when a dry heat air bath is used.
It is preferably about 0 ° C. The drawing in the second and subsequent stages preferably uses a dry heat air bath, and is preferably carried out at about 130 to 300 ° C. The relaxation heat treatment uses a dry hot air bath or an organic solvent bath maintained at a temperature of about 130 to 300 ° C., or a hot water bath or a steam bath maintained at a temperature of 60 ° C. or higher, and the relaxation rate is 2 to 15%. And When the relaxation rate is less than 2%, shrinkage of the obtained fiber is likely to occur, resulting in problems such as lack of dimensional stability and occurrence of shrinkage. On the other hand, if the relaxation rate exceeds 15%, problems such as winding around the roller due to slack of the fiber occur, making stable continuous winding difficult.

Natural hair generally has a thickness of 0.05 to 0.1.
Since it is mm, it is necessary to set the fineness of the artificial hair to 20 to 100 denier in order to obtain the artificial hair having the same thickness as the natural hair. According to the present invention, the polyamide fiber of the present invention can reduce the specular gloss due to the smoothness of the surface, which cannot be suppressed by the usual melt spinning method, to the same level as natural hair. That is, a fiber having a human hair-like luster can be easily obtained only by producing the fiber by an ordinary melt spinning method. Further, by changing the blending ratio of the polyamide (A) and the polyamide (B), it is possible to freely cope with individual differences such as thickness and hardness in natural hair.

[0012]

EXAMPLES The present invention will be described below based on examples.
The properties such as the strength and elastic modulus of the fibers in the examples are JIS
It was measured according to L 1013 "Chemical fiber filament yarn test method". In Table 1, nylon MXD6 is N-
It is described as MXD6. Example 1 Nylon MXD6 (manufactured by Mitsubishi Gas Chemical Co., Inc., trade name: 6)
007) was melted using a single screw extruder and the spinning temperature was adjusted to 27
It was spun through a spinneret at 0 ° C., taken up in a water bath at a temperature of 30 ° C. having a liquid level 10 mm below the spinneret surface, and continuously stretched without being once wound. Stretching is carried out in two stages of stretching and one stage of heat setting. As a stretching means, a warm water bath at a temperature of 90 ° C. is used in the first stage stretching region and 160 in the second stage stretching region.
A dry heat air bath of ℃, a dry heat air bath of 160 ℃ was used in the heat setting region, and the stretching conditions were as follows: total draw ratio of 4.5, two-step draw ratio of 1.3, and relaxation rate of 4%. . Manufacturing speed is 135
m / min. A monofilament having a diameter of 0.08 mm was obtained by the above method. The performance of the obtained polyamide fiber is shown in Table 1.

Example 2 Nylon MXD6 (manufactured by Mitsubishi Gas Chemical Co., Inc., trade name: 6)
007) and nylon 6 (manufactured by Mitsubishi Kasei Co., Ltd., trade name: 1
020A) was dry-blended in a weight ratio of 40/60 and then melt-spun, and the diameter was adjusted to 0.0 by the same method as in Example 1.
8 mm monofilament was obtained. The performance of the obtained polyamide fiber is shown in Table 1.

Example 3 Nylon MXD6 (manufactured by Mitsubishi Gas Chemical Co., Inc., trade name: 6)
007) and nylon 6 (manufactured by Mitsubishi Kasei Co., Ltd., trade name: 1
020A) was dry-blended in a weight ratio of 60/40 and then melt-spun, and the diameter was adjusted to 0.0 by the same method as in Example 1.
8 mm monofilament was obtained. The performance of the obtained polyamide fiber is shown in Table 1.

Comparative Example 1 Nylon 6 (manufactured by Mitsubishi Kasei Co., Ltd., trade name: 1020A)
Was melted using a single-screw extruder, spun at a spinning temperature of 245 ° C., spun through a spinneret, and 10 mm below the surface of the spinneret.
It was taken up in a water bath having a liquid level at the position of 8 ° C. and continuously stretched without being once wound. Stretching was performed in the same manner as in Example 1 to obtain a single fiber having a diameter of 0.08 mm. The performance of the obtained polyamide fiber is shown in Table 2.

Comparative Example 2 Polyethylene terephthalate (manufactured by Unipet Co., Ltd., trade name: RT-553CN) was melted using a single-screw extruder, spun at a spinning temperature of 290 ° C., and spun through a spinneret. The film was taken up in a water bath having a liquid level at a position 10 mm below and at a temperature of 60 ° C., and continuously drawn without being once wound. Stretching was performed in the same manner as in Example 1 to obtain a single fiber having a diameter of 0.08 mm. The performance of the obtained polyamide fiber is shown in Table 2. By simply changing the blend ratio of nylon MXD6 and nylon 6 from the examples of the present invention,
It was possible to freely select the flexibility of the fiber by changing the bending property without changing the fiber diameter. In each case, the smoothness of the fiber was suppressed, and so-called specular gloss was not exhibited. Table 2 also shows the evaluation results for natural hair for comparison.

[0017]

Industrial Applicability According to the present invention, it becomes possible to easily produce a fiber for artificial hair which has human hair-like luster, high strength and a wide range of hardness by a conventional melt spinning method. Further, there are effects such as improvement of operability and safety of work, facilitation of production of wigs tailored to individuals.

[0018]

Table 1 Example No. Example 1 Example 2 Example 3 Polymer composition Polyamide (A) N-MXD6 N-MXD6 N-MXD6 Polyamide (B) -Nylon 6 Nylon 6 Blend ratio (A) / (B ) 100/0 60/40 40/60 Thickness (mm) 0.08 0.08 0.08 Fineness (D) 50 51 52 Stretch ratio 4.5 4.5 4.5 Appearance Low gloss Low gloss Low gloss Dry state ^{* 1} Tensile strength (gf / D) 6.5 6.5 6.3 Young's modulus (kgf / mm ² ) 670 530 450 Wet condition ^{* 2} Tensile strength (gf / D) 6.1 6.0 5.7 Young's modulus (kgf / mm ² ) 580 420 360 * 1 Humidity control condition: 23 ° C, relative humidity 50% , 24 hours * 2 Humidity condition: 23 ℃, water, 24 hours

[0019]

[Table 2] Comparative Example 1 Comparative Example 2 Resin used for natural hair Nylon 6 PET- Thickness (mm) 0.08 0.08 0.05-0.1 Fineness (D) 53 44 25-120 Stretch ratio 4.5 4.5 4.5 Appearance High gloss High gloss Low gloss Dry state ^{* 1} Tensile strength (gf / D) 6.2 5.3 1.6 Young's modulus (kgf / mm ² ) 240 830 450 Wet condition ^{* 2} Tensile strength (gf / D) 5.6 5.3 1.3 Young's modulus (kgf / mm ² ) 150 800 380 * 1 Humidity control condition: 23 ° C, 50% relative humidity, 24 hours * 2 conditioning Wet condition: 23 ° C., water, 24 hours PET in the table means polyethylene terephthalate.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location D01F 8/12 Z 7199-3B D02J 1/22 J (72) Inventor Takatoshi Shida Higashihachiman, Hiratsuka-shi, Kanagawa 5-6-2 Sanryo Gas Chemical Co., Ltd. Plastics Center

Claims (5)

[Claims] 1. 100 parts by weight of a mixed polyamide comprising a polyamide (A) containing 70 mol% or more of an amide structural unit formed by a polycondensation reaction of metaxylylenediamine and adipic acid and another polyamide (B). Stretched polyamide fiber for artificial hair, comprising 10 to 100 parts by weight of polyamide (A). 2. 100 parts by weight of a mixed polyamide comprising a polyamide (A) containing 70 mol% or more of an amide structural unit formed by a polycondensation reaction of metaxylylenediamine and adipic acid and another polyamide (B). Stretched polyamide fiber for artificial hair, comprising 40 to 100 parts by weight of polyamide (A). 3. Another polyamide (B) is nylon 6,
The stretched polyamide fiber for artificial hair according to claim 1 or 2, which is at least one kind of nylon 66 and nylon 666. 4. The stretched polyamide fiber for artificial hair according to claim 1, wherein the stretch ratio is 2.5 to 10 times. 5. The stretched polyamide fiber for artificial hair according to claim 1, which has a fineness of 20 to 100 denier.