JP2008285771A - Multicolor-dyeable polyester-based artificial hair fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial hair fiber multicolor-dyeable at normal pressure, free from causing delustering seen in dyeing under high temperature and high pressure, and as a result, containing a polyester-based fiber allowing to use an ordinary dyeing condition and device. <P>SOLUTION: This polyester-based artificial hair fiber is obtained by using a polyester-based fiber which includes 40-80 wt.% of polyethylene terephthalate, and 20-60 wt.% of at least one kind of polyalkylene terephthalate excluding polyethylene terephthalate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a polyester-based artificial hair fiber. More specifically, the present invention relates to a polyester-based artificial hair fiber capable of multicolor dyeing at normal pressure while maintaining fiber properties such as heat resistance, chemical resistance, and high elongation.

  In hair products such as wigs, hair wigs, furs, hair bands, doll hairs, conventionally, fibers for human hair and artificial hair (modacrylic fibers, polyvinyl chloride fibers) and the like have been used. However, in recent years, it has become increasingly difficult to obtain human hair, and the importance of artificial hair fibers has increased. In recent years, artificial hair fibers using fibers mainly composed of polyester typified by polyethylene terephthalate, which is excellent in heat resistance, have been proposed as artificial hair fiber materials.

On the other hand, the fiber for artificial hair needs to be arranged in a great number of colors as a product in order to cope with various races or hues of the original hair of an individual or a wide variety of desired hues. In particular, there is an increasing demand for fibers capable of so-called multicolor dyeing that impart a plurality of different hues of two or more colors in the length direction of a single fiber. Examples of the multicolor dyeing method include a method of dyeing different hues a plurality of times from the base of the fiber to the hair tip, or a method of further dyeing a pre-colored fiber.
Polyester fibers are usually dyed with disperse dyes at high temperatures and high pressures (130 ° C, sealed, etc.), so it is often used at customers, that is, factories that process artificial hair fibers into raw materials for artificial hair. When performing color dyeing, it is necessary to introduce a new apparatus. In addition, the work is complicated and not practical. At the same time, the fiber is devitrified (transparency is lowered) at high temperatures, and the commercial properties are impaired. On the other hand, if a carrier (according dye) is added to the dyeing solution, it can be dyed under normal pressure, but the fastness is lowered, the carrier needs to be removed after dyeing, the human body and the environment. There are shortcomings such as the need to consider the adverse effects of.
On the other hand, a method of incorporating polypropylene terephthalate into a polyester fiber containing polyethylene terephthalate as a main component in order to improve color developability has been proposed (Patent Document 1).
This method is a method for improving color development by forming a streak groove on the fiber surface by combining a blend of polypropylene terephthalate and alkali weight reduction. There remains a problem that it is necessary to introduce a device and that the work becomes complicated. In addition, this method is likely to be fibrillated when a large amount of polypropylene terephthalate is blended because the fineness is small, and the amount of polypropylene terephthalate used is limited.
JP-A-11-189971

  Accordingly, an object of the present invention is to provide artificial hair made of polyester fiber that can be dyed in multiple colors at normal pressure and does not have the devitrification seen in dyeing under high temperature and high pressure, so that normal dyeing conditions and equipment can be used. It is to provide fibers for use.

The present invention
1) A fiber for artificial hair containing a polyester fiber comprising 40 to 80% by weight of polyethylene terephthalate and 20 to 60% by weight of at least one other polyalkylene terephthalate,
2) The fiber for artificial hair according to 1), wherein the polyalkylene terephthalate is polypropylene terephthalate,
3) The fiber for artificial hair according to 1) or 2), wherein the single fiber fineness of the polyester fiber is 10 to 100 dtex,
About.

  According to the present invention, it is possible to obtain a fiber for artificial hair that is excellent in color developability and excellent in sublimation fastness.

  Hereinafter, the present invention will be described in detail.

  The present invention comprises a polyester fiber comprising 40 to 80% by weight of polyethylene terephthalate and 20 to 60% by weight of at least one other polyalkylene terephthalate. The main component is polyalkylene terephthalate or polyalkylene terephthalate used in the present invention. Examples of the copolyester include polyalkylene terephthalates such as polypropylene terephthalate and polybutylene terephthalate and / or copolymer polyesters mainly composed of these polyalkylene terephthalates and containing a small amount of copolymer components.

The main component means that 80 mol% or more of polyalkylene terephthalate is contained. Examples of the copolymer component include isophthalic acid, orthophthalic acid, naphthalenedicarboxylic acid, paraphenylenedicarboxylic acid, trimellitic acid, pyromellitic acid, succinic acid, glutaric acid, adipic acid, superic acid, azelaic acid, sebacic acid , Polycarboxylic acids such as dodecanedioic acid, derivatives thereof, dicarboxylic acids including sulfonates such as 5-sodium sulfoisophthalic acid, dihydroxyethyl 5-sodium sulfoisophthalate, derivatives thereof, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol, polyethylene glycol, trimethylolpropane, pentaerythritol, 4-hydro Shi benzoic acid, etc. ε- caprolactone.
The copolymer polyester is usually produced by reacting a main component of terephthalic acid and / or a derivative thereof (for example, methyl terephthalate) and a polymer of alkylene glycol with a small amount of a copolymer component. Although it is preferable from the viewpoint of stability and ease of operation, a monomer or oligomer which is a small amount of a copolymer component in a mixture of terephthalic acid and / or its derivative (for example, methyl terephthalate) as a main component and alkylene glycol You may manufacture by polymerizing what contained the component. The copolymerized polyester is not particularly limited as long as the copolymerized component is polycondensed to the main chain and / or side chain of the main polyalkylene terephthalate.

  Specific examples of the copolymer polyester mainly composed of the polyalkylene terephthalate include, for example, a polyester mainly composed of polyethylene terephthalate and copolymerized with ethylene glycol ether of bisphenol A, and a polyester copolymerized with 1,4-cyclohexanedimethanol. -Polyester copolymerized with dihydroxyethyl sodium sulfoisophthalate. The polyalkylene terephthalate and the copolyester may be used singly or in combination of two or more. Among these, polypropylene terephthalate, polybutylene terephthalate, copolymer polyester (polyester mainly composed of polyethylene terephthalate, copolymerized with ethylene glycol ether of bisphenol A, polyester copolymerized with 1,4-cyclohexanedimethanol, 5-sodium Polyesters copolymerized with dihydroxyethyl sulfoisophthalate) are preferred, and those in which two or more of them are mixed are also preferred.

  The polyethylene terephthalate of the present invention is used in the range of 40 to 80% by weight, and preferably in the range of 50 to 70% by weight. When the polyethylene terephthalate is in the range of 40% by weight to 80% by weight, it is possible to balance heat resistance, high elongation, and atmospheric dyeability.

The polyester fiber containing the polyethylene terephthalate of the present invention and at least one other polyalkylene terephthalate is preferably a blended or randomly copolymerized composition of the two components, but is not limited thereto.
The polyester-based resin composition used in the present invention can be produced by dry blending and then melt-kneading using various general kneaders. Examples of the kneader include a single screw extruder, a twin screw extruder, a roll, a Banbury mixer, and a kneader. Among these, a twin screw extruder is preferable from the viewpoint of adjusting the degree of kneading and ease of operation.

  The polyester-based artificial hair fiber of the present invention can be produced by melt spinning the polyester-based resin composition by an ordinary melt spinning method. That is, for example, the temperature of an extruder, a gear pump, a die, etc. is set to 270 to 310 ° C., melt-spun, the spun yarn is passed through a heating tube, cooled to the glass transition point or lower, and 50 to 5000 m / min. A spun yarn is obtained by pulling at a speed of. It is also possible to control the fineness by cooling the spun yarn in a water tank containing cooling water. The temperature and length of the heating cylinder, the temperature and blowing amount of the cooling air, the temperature of the cooling water tank, the cooling time, and the take-up speed can be appropriately adjusted depending on the discharge amount and the number of holes in the die. The obtained spun yarn is heat-drawn, and the drawing is performed by any one of a two-step method in which the spun yarn is once wound and then drawn and a direct spin-drawing method in which the drawn yarn is continuously drawn without being wound. Also good. The hot stretching is performed by a one-stage stretching method or a multi-stage stretching method having two or more stages. As a heating means in the heat stretching, a heating roller, a heat plate, a steam jet device, a hot water tank, or the like can be used, and these can be used in combination as appropriate. The stretching temperature is preferably higher than the Tg of the base polyester, such as 50 to 100 ° C.

The polyester-based artificial hair fiber of the present invention contains various additives such as heat-resistant agents, light stabilizers, fluorescent agents, antioxidants, antistatic agents, pigments, plasticizers, and lubricants as necessary. Can be made. If necessary, brominated aromatic flame retardant, bromine-containing phosphate ester flame retardant, brominated polystyrene flame retardant, brominated epoxy flame retardant, brominated phenoxy flame retardant, brominated polycarbonate flame retardant A flame retardant such as may be added. In addition, an original fiber can also be obtained by containing a pigment.
The polyester-based artificial hair fiber of the present invention thus obtained is a non-crimp raw fiber-like fiber, and its fineness is usually 10 to 100 dtex, more preferably 20 to 90 dtex. Suitable for fiber.
The polyester-based artificial hair fiber of the present invention can be dyed under the same conditions as ordinary polyester-based fibers. Polyester fiber dyeing methods include commonly used package dyeing methods, pot dyeing methods, cheese dyeing methods, skein dyeing methods, printing methods, etc., but are not particularly limited to dyeing methods and equipment, but the finish when multicolor dyeing is performed A pot dyeing method can be suitably used in consideration of cleanliness and operability.

  A pot dyeing device is a pot that can receive dye solution such as dyes and other auxiliaries, stabilizers, pH adjusters, etc. dissolved in water, or a dye tank such as a bathtub, and a dye solution in the dye tank at a desired temperature. Any device can be used as long as it has a mechanism that can be heated and adjusted. The size of the dyeing tank can be set arbitrarily according to the thickness and length of the fiber bundle to be dyed. It is preferable to be able to circulate the dye solution in the dyeing tank because the dyeing stability is increased.

  Although the dye used for the fiber for artificial hair of this invention is not specifically limited, Since the fiber is a polyester type, the well-known disperse dye suitable for this can be used conveniently. For example, azo dyes, anthraquinone dyes, indigo dyes, triphenylmethane dyes, diphenylmethane dyes, triphenylamine dyes, reactive dyes, sulfur dyes, etc. can be used, and these can be used alone or in combination of two or more. It is possible. Moreover, it is possible to adjust to the arbitrary color requested | required as a fiber for artificial hair by three color system combination of blue, red, and yellow. Moreover, in order to ensure the light resistance requested | required as a fiber for artificial hair, it is preferable to use a high light resistance dye. The concentration of the dye constituting the dyeing solution can be arbitrarily adjusted. However, in the combination of the three colors, in general, in the dark color, the total amount is about 6% omf. In addition, it is preferable from the viewpoints of leveling property, stability of the fiber after dyeing, that is, discoloration and abrasion resistance.

In the dyeing solution at the time of dyeing, acid, salt, dispersant, mordant, antistatic agent, in order to adjust the exhaustion, leveling and stability of the dye and to ensure the durability of the product, It is also possible to add any one or a combination of two or more migration inhibitors.
A desired multi-color dyeing is performed by immersing a desired portion of a fiber bundle in which one end or both ends of an original fiber are bound in an arbitrary number of times and an arbitrary number of times in a dyeing solution. The fiber can be dyed. In the method of further dyeing the original fibers, the color developability becomes better. In order to immerse the fiber bundle in the dyeing solution in the dyeing tank, it is only necessary to have a mechanism for suspending, and if there is a mechanism for rotating the suspended fiber bundle in the vertical direction, the horizontal direction, or rotating, Dyeing to a wide variety of hues is possible.

  The fiber for artificial hair of the present invention contains polypropylene terephthalate, the temperature at which dye absorption starts is shifted to the low temperature side, and absorption starts from about 50 ° C. For this reason, it is preferable to use a leveling agent and set the dyeing time on the low temperature side slightly longer than usual. As an example of the dyeing conditions, the bath ratio is 1:40, the temperature is raised from 30 ° C. to 80 ° C. for 20 minutes, the temperature from 80 ° C. to the boiling state in 15 minutes, and then the boiling condition is 30 to 60 minutes. Can be applied.

  When the artificial hair fiber of the present invention is used, when performing multicolor dyeing or the like, it is useful in terms of the degree of freedom of dyeing and its conditions, the degree of freedom of selection of a dyeing machine, and the like.

Next, the present invention will be described more specifically based on examples, but the present invention is not limited thereto. The characteristic value measurement method is as follows.
(Strength and elongation)
The tensile strength and elongation of the filament are measured using an INTESCO Model 201 type manufactured by Intesco. A filament having a length of 40 mm is taken, 10 mm on both ends of the filament is sandwiched between a mount (thin paper) to which a double-sided adhesive tape is attached, and air-dried overnight to produce a sample having a length of 20 mm. A sample is mounted on a testing machine, a test is performed at a temperature of 24 ° C., a humidity of 80% or less, a load of 0.63 mN × fineness (dtex), and a tensile speed of 20 mm / min to measure the strength and elongation. The test is repeated 10 times under the same conditions, and the average value is defined as the filament elongation.
(Color development)
A tow filament having a length of 30 cm and a total fineness of 100,000 dtex is visually evaluated under sunlight.

  ○: Slightly opaque (cloudy), but color depth is not reduced.

  (Triangle | delta): There exists some opaqueness and the color depth has fallen a little.

X: There is an opaque feeling and there is no color depth.
(Blurred color border)
A tow filament having a length of 30 cm and a total fineness of 100,000 dtex is visually evaluated under sunlight.

○: There is no color blur and the border is clear. Δ: There is a slight color blur and the border is slightly unclear, but it is acceptable after product processing.

X: The color is blurred and the boundary is unclear.
(Sublimation fastness)
The ends of a tow filament having a length of 10 cm and a weight of 2.0 g are fixed, both sides are sandwiched between polyester fabrics, and pressed using a SCORCH TESTER (manufactured by ATLAS) at 180 ° C. for 30 minutes. In accordance with JIS L-0805, the degree of contamination is determined using a contamination gray scale.

○: 4.0 grade or higher △: 3.0 to 3.5 grade ×: 2.5 grade or less (fastness to friction)
A tow filament having a length of 10 cm and a weight of 2.0 g is attached to the mount, and is rubbed 100 times with a polyester fabric using a friction tester (manufactured by Suga Test Machine Co., Ltd.). In accordance with JIS L-0805, the degree of contamination is determined using a contamination gray scale.

○: 4.0 grade or higher △: 3.0 to 3.5 grade ×: 2.5 grade or less (light resistance)
A tow filament is affixed to a mount so that the length is 65 mm, the width is 13 mm, and the paper surface is not transparent, and using a Xenon Weather Meter (X25 manufactured by Suga Test Machine Co., Ltd.), an irradiance of 48 W / m ² , Treatment is performed for 80 hours, 160 hours, and 320 hours at 43 ° C. and 50% RH. According to JISL-0804, the degree of fading of the fiber at each time is determined by the gray scale for fading.

◯: Grade 4 or higher ×: Grade 3.5 or lower (Examples 1 to 5, 7, 8)
Polyethylene terephthalate (manufactured by Mitsubishi Chemical Corporation, BK-2180) and polypropylene terephthalate (manufactured by Shell Chemicals, Cortera CP509200) dried to a water content of 100 ppm or less were used in the proportions shown in Table 1, and a total of 100 parts by weight thereof. On the other hand, a resin comprising 0.3 parts by weight of fine silica silicia 310P (manufactured by Fuji Silysia Chemical Co., Ltd.) was melt-spun by a conventional method to obtain an undrawn yarn. Next, undrawn yarns were combined, drawn, and heat set to obtain a polyester fiber (multifilament) having a single fiber fineness of 50 to 70 dtex. Next, disperse dyes (Dianster Japan Co., Ltd., Dianix), Orange, Rubine, Blue, each color, dispersant (Nissei Kasei Co., Ltd., Bispamol BNA), leveling penetrant (Nissei Co., Ltd.) After preparing a dyeing solution in which Solsei SPD-H) was added to 2.0 g / L each and adjusting the pH to 4.5 with acetic acid, the fiber bundle was immersed in a dyeing tank, and the bath ratio was 1: It dye | stained at 30,98-99 degreeC. After dyeing is completed, washing with hot water, reduction cleaning, drying and stretching are carried out in a conventional manner, and the dyed fiber bundle is added to the dye solution prepared with a different blending amount so that a desired different color dyed part is formed. Partial soaking and repeated dyeing. Table 1 shows the results of evaluation of strength and elongation, color developability, color boundary blur, sublimation fastness, friction fastness, and light resistance of the obtained fiber.
(Example 6)
Fine silica with respect to a total of 100 parts by weight of 80 parts by weight of polyethylene terephthalate (manufactured by Mitsubishi Chemical Co., Ltd., BK-2180) and 20 parts by weight of polypropylene terephthalate (manufactured by Shell Chemicals, Cortera CP509200) dried to a water content of 100 ppm or less. Silicia 310P (Fuji Silysia Chemical Co., Ltd.) 0.3 parts by weight, Pigment Master Batch PESM 22367 BLACK (Daiichi Seika Kogyo Co., Ltd.) 2.0 parts by weight, PESM 1001 YELLOW (same) 2.0 parts by weight, PESM 3005RED (same as above) ) A resin consisting of 0.1 parts by weight was melt-spun by a conventional method to obtain an undrawn yarn by original deposition. Next, undrawn yarns were combined, drawn, and heat set to obtain a polyester fiber (multifilament) having a single fiber fineness of 50 to 70 dtex.

  Next, in the same manner as in Example 1, the original fiber bundle was immersed in a dyeing tank and dyed. After dyeing is completed, washing with hot water, reduction washing, drying, and wrinkle are performed in the usual manner. The resulting fibers have strength and elongation, color developability, color boundary blurring, sublimation fastness, friction fastness, and light resistance. The results of evaluating the properties are shown in Table 1.

(Comparative Examples 1 and 2)
A polyester fiber (multifilament) was obtained by the same method as in Example 1, a dyeing solution to which a disperse dye, a dispersant, and a leveling penetrant was added was prepared, and dyed by the same method as in Example 1. Table 2 shows the results of evaluating the strength and elongation, color developability, blurring of color boundaries, fastness to sublimation, fastness to friction, and light resistance of the obtained fibers.

As shown in Tables 1 and 2, it was confirmed that the examples were superior in strength and elongation, color development and blurring between color boundaries, sublimation fastness, fastness to friction, and light fastness compared to the comparative examples. It was.
Therefore, the polyester-based artificial hair fiber of the present invention can be dyed in multiple colors at normal pressure, has no problem of fiber devitrification, has excellent practical durability as a product for artificial hair, Since dyeing conditions and equipment can be used, it is possible to easily produce multicolor dyes at the customer's site, and to obtain artificial hair fibers with excellent commercial properties that can handle a wide variety of hues that have not been obtained before. It is done.

Claims (3)

  A fiber for artificial hair comprising a polyester fiber comprising 40 to 80% by weight of polyethylene terephthalate and 20 to 60% by weight of at least one other polyalkylene terephthalate.   The artificial hair fiber according to claim 1, wherein the polyalkylene terephthalate is polypropylene terephthalate.   The fiber for artificial hair according to claim 1 or 2, wherein the polyester fiber has a single fiber fineness of 10 to 100 dtex.