WO2015194521A1

WO2015194521A1 - Method for manufacturing artificial hair fibers, and artificial hair fibers

Info

Publication number: WO2015194521A1
Application number: PCT/JP2015/067239
Authority: WO
Inventors: 阿部　稔; 林　誠
Original assignee: ルアン株式会社; ダイワボウホールディングス株式会社; ダイワボウレーヨン株式会社
Priority date: 2014-06-19
Filing date: 2015-06-16
Publication date: 2015-12-23
Also published as: JPWO2015194521A1

Abstract

[Problem] To provide a method for manufacturing artificial hair fibers from which dye or functional agents are not dislodged, and artificial hair fibers. [Solution] The artificial hair fibers according to the present invention are produced by mixing a fiber material, an inorganic pigment, and a functional agent before spinning, and then spinning the mixture and cutting the spun filaments. Dislodging of the inorganic pigment or functional agent is accordingly prevented. Discoloration or malfunctioning of the artificial hair fibers is thereby prevented. Also, the use of an inorganic pigment in the artificial hair fibers according to the present invention yields light resistance that is superior to that of organic dyes, and a high degree of safety in regard to skin disorders such as allergies. Furthermore, since the artificial hair fibers according to the present invention are colored by spin-dyeing, the functional agents are not covered by the dye. It is thereby possible for the functional agents to function effectively.

Description

Method for producing artificial hair fiber and artificial hair fiber

The present invention relates to an artificial hair fiber used for the purpose of spraying on the head and making thin hair inconspicuous, and a method for producing the artificial hair fiber.

Conventionally, wrinkles and flocking are known as means for compensating for the shortage of hair caused by hair loss. However, the cocoon is expensive and the scalp may get muddy or inadvertently dropped during use. In addition, in order to receive a flocking operation, it is necessary to go to a designated place many times, and many people are reluctant to receive the operation. Therefore, artificial hair fibers that make thin hairs inconspicuous by spraying short fibers of regenerated cellulose fibers such as rayon on the thin hair portions and fixing them are commercialized. Regarding such a method for producing artificial hair fibers and artificial hair fibers, for example, the invention described in the following [Patent Document 1] by the present inventor is disclosed.

Japanese Patent No. 4276887

Such artificial hair fibers are generally produced by spinning a predetermined fiber material, dyeing it, and cutting it into a predetermined length. Moreover, when adding functional agents, such as an antibacterial component, it is common to add a functional agent after spinning and then to dye. However, in artificial hair fibers that have been dyed and added with a functional agent after spinning, the dyes and functional agents may fall off during use, and the artificial hair fibers may lose color or malfunction. In addition, the dropped dye or functional agent may adhere to the scalp or clothes and cause problems such as color transfer.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing artificial hair fibers and an artificial hair fiber in which the dyes and functional agents do not fall off.

The present invention
(1) A method for producing artificial hair fibers used by being applied to the head,
A mixing step (step S100) in which an inorganic pigment and a functional agent are added and mixed in the cellulose solution, a spinning step (step S102) in which the cellulose solution obtained by the mixing step is spun into a fiber, and the spinning step A cutting step (step S106) for cutting the regenerated cellulose long fibers obtained by step into predetermined short fibers,
The functional agent is
It contains any one or more of a photocatalytic functional agent having a photocatalytic action, an organic polymer functional agent having a carboxyl group and having antibacterial properties, or a sulfur functional agent containing sulfur powder. The above-described problems are solved by providing a method for producing artificial hair fibers.
(2) The cutting process is
The regenerated cellulose long fiber (rayon long fiber Fa) is placed in a cylindrical crushing chamber 1 formed by a perforated plate-like screen 2, and a plurality of rotary blades 4 provided inside the crushing chamber 1 are rotated. By doing so, the regenerated cellulose long fiber is pulverized by the shearing force and impact force repeatedly generated between the rotary blade 4 and the screen 2 and the fixed blade 6 in which the blade edge of the rotary blade 4 is in sliding contact or close proximity, Obtaining a first short fiber f1 whose length is not constant and irregularly bent;
Cutting the regenerated cellulose long fiber (rayon long fiber Fb) into a length of 0.1 mm to 0.5 mm to obtain a substantially straight second short fiber f2 having a constant length;
Mixing the first short fibers f1 and the second short fibers f2 at a predetermined ratio;
The above-mentioned problem is solved by providing a method for producing an artificial hair fiber as described in (1) above, characterized by comprising:
(3) By providing the method for producing an artificial hair fiber as described in (1) or (2) above, wherein the cellulose solution is a viscose solution and the regenerated cellulose fiber is a viscose rayon, Solve the problem.
(4) artificial hair fibers used by being sprayed on the head,
The regenerated cellulose fiber constituting the artificial hair fiber contains an inorganic pigment and a functional agent,
The functional agent is
It contains any one or more of a photocatalytic functional agent having a photocatalytic action, an organic polymer functional agent having a carboxyl group and having antibacterial properties, or a sulfur functional agent containing sulfur powder. By providing an artificial hair fiber, the above problems are solved.
(5) The artificial hair fiber is composed of first short fibers f1 that are irregular in length and irregularly bent, and second short fibers f2 that are constant in length and substantially linear. The said subject is solved by providing the artificial hair fiber as described in said (4).
(6) The above-mentioned problem is solved by providing the artificial hair fiber according to (4) or (5) above, wherein the regenerated cellulose fiber is viscose rayon.

The artificial hair fiber manufacturing method and artificial hair fiber according to the present invention are prepared by mixing an inorganic pigment and a functional agent in a fiber material before spinning, spinning and cutting the fiber material. For this reason, the dye and the functional agent do not fall off. Thereby, the generation | occurrence | production of discoloration and malfunction of an artificial hair fiber can be prevented. Moreover, it is possible to prevent the dropped dye and functional agent from adhering to the scalp and clothes.

It is a process flowchart of the manufacturing method of the artificial hair fiber which concerns on this invention. It is a figure which shows the suitable cutting apparatus for manufacture of the 1st short fiber based on this invention. It is a figure which shows the cutting apparatus suitable for manufacture of the 2nd short fiber which concerns on this invention.

Embodiments of a method for producing artificial hair fibers and artificial hair fibers according to the present invention will be described with reference to the drawings. First, the artificial hair fiber according to the present invention is prepared by mixing an inorganic pigment and a functional agent in a known cellulose solution, and then spinning and cutting. Here, it is referred to as “priming” that a colored fiber is obtained by blending a pigment in a cellulose solution and then spinning it.

The cellulose solution used for the artificial hair fiber of the present invention is a viscous liquid in which cellulose is made into a solution, and may be a solution by a copper ammonia method or a solution using NMMO (N-methylmorpholine-N-oxide) as a solvent. Among them, it is particularly preferable to use a solution using the viscose method. In the viscose method, the stability of the cellulose solution is not hindered when mixed with water, which is a solvent for preparing a functional agent dispersion. In addition, by dispersing the functional agent in a solvent, a considerable amount of the functional agent can be mixed into the cellulose solution. For this reason, it can be said that it is particularly preferable to use a viscose cellulose solution (viscose solution) as the cellulose solution used in the present invention. Therefore, here, an example in which viscose (solution) is used as the cellulose solution is shown. In addition, although the viscose in the below-mentioned Example uses what contained cellulose 8.5mass%, sodium hydroxide 5.7mass%, and carbon disulfide 2.8mass%, this compounding composition is an example, Viscose is not particularly limited to this composition.

Further, the inorganic pigment used in the artificial hair fiber of the present invention is for dyeing rayon fiber (regenerated cellulose fiber) into a predetermined hair color by being attached, and the inorganic pigment used, the added amount, the blending ratio, etc. are the purpose. Is appropriately selected and determined according to the hair color of the artificial hair fiber. As the black inorganic pigment, known black pigments such as carbon black and black iron oxide can be used. As the red inorganic pigment, a known red pigment such as red iron oxide can be used. As yellow inorganic pigments, known yellow pigments such as yellow iron oxide can be used. Moreover, charcoal and other well-known inorganic pigments can be used. The inorganic pigment used in the present invention is highly safe and harmless to the human body, and it is particularly preferable to use a pigment that has been approved as a cosmetic base material. When the amount of the inorganic pigment added to the viscose is small, the target hue cannot be obtained, and when it is excessive, the fiber properties are adversely affected. Therefore, the amount of the inorganic pigment added is preferably 0.1 mass% to 10 mass% with respect to the cellulose in the solution.

In addition, the inorganic pigment is preferably dispersed in a solvent (water) and mixed with viscose as an inorganic pigment emulsion. At this time, if the particle size of the inorganic pigment is too large, the required amount of the inorganic pigment increases and it becomes difficult to make viscose into a fiber. On the other hand, if the particle size of the inorganic pigment is too fine, secondary aggregation occurs, resulting in a large particle size. In addition, the viscosity of the inorganic pigment emulsion is increased, resulting in a decrease in fluidity and hindering handling. Therefore, the average particle size of the inorganic pigment in the inorganic pigment emulsion is preferably 0.1 μm to 3 μm, more preferably 0.1 μm to 1 μm. The maximum particle size of the inorganic pigment is preferably 5 μm or less so that the inorganic pigment particles do not protrude from the surface of the artificial hair fiber. The inorganic pigment is pulverized by appropriately using a well-known dry or wet pulverization method such as a jet mill, a tornado mill, or a ball mill. In the case of wet pulverizing the inorganic pigment emulsion, the concentration of the inorganic pigment is preferably 15 mass% to 50 mass% at which wet pulverization is effective. In preparing the inorganic pigment emulsion, it is preferable to improve the dispersibility by adding about 10 mass% of a dispersant such as an anionic surfactant to the inorganic pigment powder.

Further, the functional agent used for the artificial hair fiber of the present invention imparts an antibacterial function, a deodorizing function, a pH buffering function, etc. to the artificial hair fiber, and has a photocatalytic functional agent having a photocatalytic function, or a functional group of a carboxyl group. It contains at least one of an organic polymer functional agent having a group and antibacterial properties, or a sulfur functional agent containing sulfur powder.

These functional agents can be used regardless of solid or liquid. However, it is preferable to add the functional agent to the viscose after being dispersed or dissolved in water in advance. Therefore, it is preferable to use an aqueous dispersion as the functional agent. When the functional agent is solid, it is preferable to use a fine powder having an average particle size of 0.1 μm to 3 μm, more preferably 0.1 μm to 1 μm, like the inorganic pigment.

Next, the functional agent of the present invention, that is, the photocatalytic functional agent, the organic polymer functional agent, and the sulfur functional agent will be described. First, as the photocatalytic functional agent used in the present invention, a well-known photocatalytic material such as titanium dioxide (TiO ₂ ) that decomposes bacteria or organic substances that become a bad odor source by photocatalytic action can be used. The particle size of the photocatalytic functional agent is preferably about 1/4 to 2 times the wavelength of the light to be acted on. When the particle size is larger than this, the photocatalytic activity is reduced. Therefore, the average particle size of the photocatalytic functional agent is preferably 1 μm or less, and more preferably the maximum particle size is 0.8 μm or less. Furthermore, the photocatalytic functional agent is micronized to suppress deterioration due to ultraviolet rays. Therefore, it is preferable that the photocatalyst-based functional agent is pulverized within a range that does not cause problems in fiber formation. Further, if the amount of the photocatalytic functional agent added is small, antibacterial and deodorizing effects cannot be obtained, and if it is large, defects in the physical properties of the rayon fiber occur. In addition, since titanium dioxide, which is a general photocatalytic functional agent, also functions as a white pigment, the hue of artificial hair fibers changes as the amount added increases. Therefore, the addition amount of the photocatalytic functional agent is preferably 0.5 mass% to 5 mass% with respect to cellulose. If the amount is within this range, the color of the inorganic pigment remains strong and visually unnoticeable, so there is no significant change in the hue of the added inorganic pigment.

In addition, the organic polymer functional agent according to the present invention has a carboxyl group, and in addition to an antibacterial function, a deodorizing function, a moisture conditioning function, a moisture absorbing function, a pH buffering function, and the like are provided to the artificial hair fiber, For liquid compounds, use well-known organic polymer materials in addition to protein-based materials such as polyacrylic acid, polyacrylates, acrylate copolymers, maleic acid copolymers, polyvinyl compounds, alginic acid, aspartic acid, etc. Can do. Moreover, if it is solid, well-known organic polymer materials, such as ester partial hydrolyzate, can be used. An organic polymer functional agent having a larger number of carboxy groups can achieve a higher effect. Therefore, the organic polymer functional agent having a carboxyl group of about 5 mmol / g to 14 mmol / g is particularly preferable. Furthermore, it is particularly preferable to use an organic polymer functional agent having a molecular weight of 5000 or more. If the addition amount of these organic polymer functional agents is small, the above-mentioned effects cannot be obtained, and if the addition amount is large, there is a possibility that problems may occur in fiber formation. Therefore, it is preferably 0.5 mass% to 10 mass% with respect to cellulose.

In addition, when the functional agent is a liquid, the viscosity of the functional agent is related to the degree of polymerization. If the functional agent is low, the molecular weight is small and the functional agent may fall off during fiber formation. Further, when the viscosity is high, the molecular weight increases but handling becomes difficult. Therefore, it is preferable to use a functional agent aqueous solution having a viscosity of 200 mPa · s to 4000 mPa · s. When the functional agent is a liquid, it is preferably dissolved in water in advance and added to the viscose in the form of an aqueous solution. At this time, if the concentration of the functional agent in the functional agent aqueous solution is low, the amount of addition to the viscose increases, causing problems during fiberization. On the other hand, when the concentration is high, the viscosity of the aqueous functional agent solution is increased, which hinders fluidity and handling. Therefore, the concentration of the functional agent aqueous solution is preferably 5 mass% to 50 mass%.

Further, the sulfur functional agent according to the present invention contains sulfur fine powder or sulfur fine powder having a strong antibacterial action particularly against ringworm and acne as a main component. Since sulfur is hydrophobic, it is preferably finely pulverized in water using a wet pulverizer such as a ball mill to obtain a finely dispersed state. However, sulfur, which is the main component of the sulfur-based functional agent, partially dissolves in the alkali in the viscose and is eluted during fiberization. Therefore, the particle size is preferably 0.5 μm or more. Moreover, if there is little addition amount of a sulfur type functional agent, an effect will not be acquired by the melt | dissolution to an alkali, and elution, and if too much, a sulfur smell will be emitted. Therefore, it is preferably 0.2 mass% to 5 mass% with respect to cellulose.

Next, a method for producing an artificial hair fiber according to the present invention will be described with reference to the process flowchart of FIG. First, a predetermined cellulose solution (viscose), an inorganic pigment, and a functional agent are mixed (mixing step: step S100). At this time, the inorganic pigment and the functional agent are preferably added to the cellulose solution (viscose) in a state of being dispersed in water in advance. As the functional agent, the above-mentioned photocatalytic functional agent, organic polymer functional agent, sulfur functional agent may be used alone, or a plurality of these functional agents may be combined. When a plurality of photocatalytic functional agents, organic polymer functional agents, and sulfur functional agents are used in combination, the total amount of inorganic pigment and functional agent is 0.5 mass% to 15 mass%, particularly 2 mass% to 10 mass, based on cellulose. % Is preferable.

Next, the cellulose solution (viscose) to which the inorganic pigment and the functional agent are added is spun into a fiber (spinning process: step S102). As a spinning method in this spinning step, for example, a well-known spinning method such as a one-bath tension spinning method can be used.

Next, the cellulose that has been made fibrous in the spinning process is scoured, and unnecessary by-products are removed to form a regenerated cellulose fiber (viscose rayon fiber) (scouring process: step S104). This scouring step is performed by a known scouring method that sequentially performs hot water treatment, hydrosulfurization treatment, water washing treatment, and the like.

The regenerated cellulose long fibers (viscose rayon long fibers) obtained as described above are cut into predetermined short fibers by the cutting step (step S106) to obtain artificial hair fibers.

Next, a preferable cutting process of the artificial hair fiber according to the present invention will be described. Here, the regenerated cellulose long fiber used is described as rayon long fiber, and this rayon long fiber is cut into two short fibers having different shapes (first short fiber f1 and second short fiber f2). An example in which a mixture is configured at a predetermined ratio is shown. However, the artificial hair fiber according to the present invention does not necessarily need to combine a plurality of short fibers, and a predetermined short fiber may be used alone.

Here, FIG. 2 is a schematic view showing an example of a cutting device 80a suitable for the method for producing artificial hair fibers according to the present invention for pulverizing and cutting rayon long fibers. The cutting apparatus 80a shown in FIG. 2 has a cylindrical crushing chamber 1, and the crushing chamber 1 is formed of a perforated plate-like screen 2 having minute holes for classification. Then, a plurality of rotary blades 4 are fixed at a predetermined interval through a rotor hub 5 fixed to the rotor shaft 3. In addition, a fixed blade 6 in which the cutting edge of each rotary blade 4 is slidably contacted or close to each other is provided at the upper part of the crushing chamber 1, and the first short fibers f 1 that have passed through the screen 2 are collected outside the crushing chamber 1. A recovery path 7 is formed, and the lower end thereof is opened to the outside as an outlet 8.

Then, when the rayon long fiber Fa is put into the pulverization chamber 1 with the rotary blade 4 rotated, the rayon long fiber Fa is sheared and impacted between the fixed blade 6 and the screen 2 by the rotation of the rotary blade 4. Are repeatedly crushed and cut, passed through the fine holes of the screen 2 in order from the one having reached a predetermined particle size, and taken out to the outside as the first short fibers f1. As described above, the first short fibers f1 pulverized and cut by the cutting device 80a are repeatedly subjected to shearing force and impact force on the rayon long fibers Fa, and many of them are irregularly bent and the length is not constant. For this reason, the 1st short fiber f1 obtained by the cutting apparatus 80a has high bulky property (bulkiness). If two or more kinds of rayon long fibers Fa having different finenesses are pulverized and cut by a cutting device 80a to mix the first short fibers f1 having different finenesses, the first short fibers f1 having higher bulkiness can be obtained. Obtainable. In addition, the particle size of the 1st short fiber f1 can be adjusted with the magnitude | size (mesh) of the screen 2, and the aperture diameter is about 0.5 mm in this example.

FIG. 3 is a schematic view showing an example of a cutting device 80b suitable for the method for producing artificial hair fibers according to the present invention for cutting rayon long fibers into a length of 0.1 mm to 0.5 mm. A cutting device 80b shown in FIG. 3 is provided along a pair of

feed rollers

11 and 12 for feeding the rayon long fiber Fb by a constant amount in the length direction, an extrusion port 13 from which the rayon long fiber Fb is extruded, and the extrusion port 13. And a cutter blade 14 that moves in the direction perpendicular to the rayon filaments Fb. Then, when the

feed rollers

11 and 12 rotate at a constant speed with a plurality of rayon long fibers Fb interposed therebetween, the leading ends of the rayon long fibers Fb protruding from the extrusion port 13 are sequentially cut by the cutter blade 14, which has a length of 0.00. It is collected in the receiving box 15 as second short fibers f2 of 1 mm to 0.5 mm. As described above, the second short fiber f2 is obtained by cutting the rayon long fiber Fb into a certain length, the shearing force and the impact force do not act repeatedly, and unlike the first short fiber f1, the second short fiber f2 has a substantially linear shape. . The length of the second short fibers f2 can be adjusted as appropriate depending on the rotational speed of the

feed rollers

11 and 12 and the moving speed of the cutter blade 14.

In the preferred artificial hair fiber according to the present invention, the first short fibers f1 and the second short fibers f2 having different shapes obtained as described above are mixed at a predetermined ratio (short fiber blending step). Such artificial hair fibers in which the first short fibers f1 and the second short fibers f2 having different shapes are mixed at a predetermined ratio can obtain a large volume feeling even when used in a small amount due to the irregularly bent first short fibers f1. In addition, the substantially straight second short fibers f2 emit a natural luster equivalent to that of the wool. Thereby, the preferable artificial hair fiber which concerns on this invention can make a volume feeling and natural gloss compatible. In addition, when mixing the 1st short fiber f1 and the 2nd short fiber f2, it is preferable that the mixing rate makes the 2nd short fiber f2 30% or more of the total weight of artificial hair fiber. However, if the number of the linear second short fibers f2 increases, the overall bulkiness is impaired, so the upper limit is preferably 80% or less, and preferably 60% or less.

Hereinafter, the present invention will be described more specifically with reference to examples. The present invention is not limited to the following examples.

[Comparative Example 1]
First, carbon black, which was approved as a cosmetic base material as an inorganic pigment, was pulverized with a tornado mill and pulverized with a jet mill. Next, an inorganic pigment emulsion was prepared by dispersing finely divided carbon black in water. At this time, 10% by mass of an anionic surfactant was blended with respect to the carbon black. Next, this inorganic pigment emulsion was put into a wet pulverizer such as a ball mill, and the inorganic pigment in the inorganic pigment emulsion was pulverized to a particle size of 1 μm or less.

Next, the inorganic pigment emulsion was added to the cellulose in the stock solution viscose so that the inorganic pigment was 2 mass%, and the mixture was stirred and mixed with a mixer. As the viscose, a well-known raw material viscose containing 8.5 mass% cellulose, 5.7 mass% sodium hydroxide, and 2.8 mass% carbon disulfide was used.

Next, this viscose was spun by the one-bath tension spinning method under the conditions of a spinning speed of 50 m / min and a drawing rate of 40%. At this time, a nozzle having 4000 discharge holes having a hole diameter of 0.07 mm was used as a spinneret for discharging viscose. Thereby, a fiber having a fineness of 3.3 dtex was obtained. The composition of the first bath (spin bath) in the one-bath tension spinning method was a Mueller bath (liquid temperature 50 ° C.) containing 100 g / L of sulfuric acid, 15 g / L of zinc sulfate, and 350 g / L of sodium sulfate.

Next, the obtained fiber was subjected to hot water treatment, hydrosulfurization treatment, and water washing treatment, then dehydrated with a compression roller, and further subjected to drying treatment at 60 ° C. for 7 hours. Thereby, rayon long fiber A was obtained.

In the mixing step, rayon long fiber B was obtained in the same manner as in [Comparative Example 1] except that 4 mass% of polyacrylic acid as an organic polymer functional agent was added to viscose. The polyacrylic acid as the organic polymer functional agent has a concentration of about 25%, a viscosity of 8000 to 12000 mPa · s, and a solution equivalent to 13.8 mmol / g of carboxy group is diluted four times to obtain a viscosity of about 1500 mPa · s. And then added to the viscose.

In the mixing step, rayon long fibers C were obtained in the same manner as in [Comparative Example 1] except that sulfur as a sulfur-based functional agent was added as a dispersion in viscose and 3 mass% was added to cellulose. The sulfur powder was added after water dispersion and wet milling with a ball mill for about 100 hours.

[Comparative Example 2]
Rayon long fibers in the same manner as in [Comparative Example 1] except that red iron oxide, which has been approved as a cosmetic base material mainly composed of iron oxide instead of carbon black, was added to 5 mass% with respect to cellulose. D was obtained.

In the mixing step, rayon long fiber E was obtained in the same manner as in [Comparative Example 2] except that 4 mass% of a polyacrylic acid solution as an organic polymer functional agent was added to cellulose in the viscose. The polyacrylic acid as the organic polymer functional agent has a concentration of about 25%, a viscosity of 8000 to 12000 mPa · s, and a solution equivalent to 13.8 mmol / g of carboxy group is diluted four times to obtain a viscosity of about 1500 mPa · s. And then added to the viscose.

[Comparative Example 3]
Rayon long fibers in the same manner as in [Comparative Example 1] except that black iron oxide, which has been approved as a cosmetic base material containing iron oxide as a main component in place of carbon black, was added to 5 mass% of cellulose. F was obtained.

In the mixing step, the rayon length was the same as in [Comparative Example 3] except that 3 mass% of the same sulfur-based functional agent used in Example 2 in viscose was added to cellulose as a dispersion. Fiber G was obtained.

In the mixing step, rayon long fibers H were obtained in the same manner as in [Comparative Example 1] except that titanium dioxide powder as a photocatalytic functional agent was added to viscose as a dispersion and added in 2 mass% to cellulose. The titanium dioxide powder having an average particle size of 1 μm or less was used.

Rayon long fibers in the same manner as in [Example 5] except that red iron oxide, which has been approved as a cosmetic base material containing iron oxide as a main component in place of carbon black, was added to 5 mass% with respect to cellulose. J was obtained.

Comparative Example 3 except that in the mixing step, titanium dioxide as a photocatalytic functional agent same as that used in Example 5 was added to viscose as a dispersion and 1.5 mass% was added to the cellulose in the viscose. ] Rayon long fiber K was obtained in the same manner.

Then, the hygroscopic property, deodorizing property, pH buffering property and antibacterial property of these rayon long fibers A to E and rayon long fibers H and J were tested. In addition, the antibacterial properties of the rayon long fibers F and G were tested.

The hygroscopicity test was conducted as follows. First, the rayon long fiber to be tested was dried for 2 hours in a low-temperature air dryer at 105 ° C. Next, each dried rayon long fiber was placed in a weighing bottle and allowed to cool in a desiccator, and then the absolute dry weight was measured. Next, each rayon long fiber was placed in a constant temperature and humidity chamber of 40 ° C. × 90% RH and left for 24 hours. Next, the weight of each rayon long fiber was measured. And the moisture content of each rayon long fiber was computed with the following formulas.
Moisture content (%) = {(weight after moisture absorption) − (absolute dry weight)} / (absolute dry weight) × 100

In addition, the deodorization test was performed as follows. First, 1.0 g of each rayon long fiber to be tested was put into a 5 liter Tedlar bag. Next, 3 liters of a measurement target gas adjusted to a predetermined gas concentration (acetic acid: initial concentration 100 ppm) was injected and left for 24 hours. Then, the gas concentration of the measurement target gas after being left for 24 hours was measured using a detector tube. Further, the gas concentration (empty test gas concentration) of the Tedlar back that was left for 24 hours without injecting the measurement object gas was measured using a detector tube. And the removal rate of each rayon long fiber was computed with the following formulas.
Removal rate (%) = (gas concentration after 24 hours) / (gas concentration after 24 hours blank test) × 100

Moreover, the pH buffering test was conducted as follows. First, 10 mg of rayon filaments to be tested were collected and used as a measurement sample. Next, this measurement sample was set in a pH measuring machine (Horiba, Ltd .: compact pH meter Twin pH B-212). Next, 0.1 mL of pH adjusted pH solution was dropped on the measurement sample, and the pH value of the measurement sample at that time was measured. The pH solution used was an aqueous sulfuric acid solution at pH 3 to pH 5, ion-exchanged water at pH 6, and aqueous ammonia at pH 7 to pH 9, respectively. The measurement was performed 4 times, and the average value was taken as the measured value. Then, the difference between the measured value after dropping the pH 9 pH solution and the measured value after dropping the pH 4 pH solution was calculated, and the pH buffering property was evaluated.

In addition, the antibacterial test against Staphylococcus aureus was performed by a method based on the unified test method. The test was conducted without pretreatment. The antibacterial test against ringworm and acne is based on the qualitative test of JIS L1902, and the rayon long fiber to be tested is placed in the center of the pour plate medium after being rounded with 28 mmφ at 37 ± 2 ° C. After culturing for 24 hours, the presence or absence of halo (growth inhibition zone) around rayon long fibers was confirmed and evaluated.

Here, the test results of each rayon long fiber are shown in [Table 1] and [Table 2]. In the pH buffer test result column, a circle indicates that the difference between the measured values of the measurement samples is within 1.0. Further, Δ marks indicate that this difference is 1.0 to 2.0. Further, the x mark indicates a case where this difference exceeds 2.0. In the column of the antibacterial test results against Staphylococcus aureus, the ◯ mark indicates that the bacteriostatic activity value is 2.2 or more and the antibacterial action is recognized. In addition, the x mark indicates that the bacteriostatic activity value is less than 2.2 and the antibacterial action was not recognized. In the column of antibacterial test results against ringworm bacteria and acne bacteria, a circle indicates that halo was confirmed and an antibacterial action was observed. Moreover, x mark shows that halo was not confirmed and the antibacterial effect was not recognized.

From Table 1 and Table 2, it was confirmed that the rayon long fibers B, C, E, G, H, and J to which the functional agent was added had a bacteriostatic activity value of 2.2 or more against Staphylococcus aureus, Antibacterial effect was recognized in all. In particular, rayon long fibers C and G using sulfur powder (sulfur functional agent) as a functional agent were confirmed to have antibacterial effects against ringworm and acne bacteria in addition to antibacterial effects against Staphylococcus aureus. Moreover, in addition to the antibacterial effect with respect to Staphylococcus aureus, the deodorizing effect and pH buffering property were recognized for the rayon long fibers B and E which used the organic polymeric functional agent for the functional agent.

In addition, regarding rayon long fiber K to which a photocatalytic functional agent was added, antibacterial evaluation of the number of general bacteria by standard agar plate culture method was performed. Results were obtained. In addition, when antibacterial evaluation of Staphylococcus aureus and Escherichia coli was performed by the bacterial solution absorption method of JIS L1902, the common logarithm of the viable count after 18 hours of Staphylococcus aureus (<1.3), the bacteriostatic activity value (> 2.7), and an evaluation result with antibacterial properties was obtained. In addition, the common logarithm of the number of viable bacteria after 18 hours of E. coli (<1.3), bacteriostatic activity value (> 5.4), bactericidal activity value (> 3.1), antibacterial activity A certain evaluation result was obtained. Further, when an antifungal quantitative test for black mold using ISO 13629-1: 2012 was conducted, the common logarithm of the amount of ATP mol after culturing for 42 hours was (−13.9), and the antifungal activity value was (3.0). ) And an antifungal evaluation result was obtained. Thereby, the antibacterial property and the antifungal property were recognized in the rayon long fiber K which added the photocatalyst type functional agent. The effect of these photocatalytic functional agents is considered to be that when the inorganic pigment and the photocatalytic functional agent are mixed in the artificial hair fiber, light reaches the functional agent and the photocatalytic action is exhibited.

As described above, the artificial hair fiber according to the present invention is prepared by mixing a fiber material, an inorganic pigment, and a functional agent before spinning, and spinning and cutting the fiber. For this reason, dropping off of the inorganic pigment and the functional agent does not occur. Thereby, discoloration and malfunction of the artificial hair fiber do not occur.

Further, since the artificial hair fiber according to the present invention uses an inorganic pigment, it is superior in light resistance to organic dyes and is highly safe against skin diseases such as allergies. Furthermore, since the artificial hair fiber according to the present invention is colored by original deposition, a dyeing process after spinning is not necessary, and costs related to the dyeing process can be reduced, production time can be shortened, and the like. Further, since no dye waste liquid or the like is generated, the burden on the environment can be reduced.

In addition, since it is colored by original deposition, even when a photocatalytic functional agent is used as the functional agent, the photocatalytic functional agent is not covered with a dye. Thereby, a photocatalyst type | system | group functional agent can be functioned effectively. In addition, when an organic dye is used for coloring, the organic dye itself may be decomposed and faded by the photocatalytic action. However, in the present invention, since an inorganic pigment is used for coloring, decomposition and fading due to photocatalysis do not occur.

In addition, when an organic polymer functional agent is used as the functional agent, in the conventional method, the carboxyl group of the functional agent may be blocked by the organic dye, which may reduce the antibacterial and deodorizing effect. However, since the inorganic pigment is used in the present invention, the carboxyl group is not blocked. Thereby, the antibacterial deodorizing action by the organic polymer functional agent can be effectively functioned. Furthermore, even when a sulfur functional agent is used as the functional agent, the sulfur functional agent is not covered with the dye, so that the antibacterial action by the sulfur functional agent can be effectively functioned.

Furthermore, the artificial hair fiber according to the present invention is produced by fiberizing a cellulose solution to which a functional agent is added. Therefore, there is a functional agent inside the fiber. Especially when an organic polymer functional agent or a sulfur functional agent is used, not only the surface of the artificial hair fiber but also the inside of the artificial hair fiber due to the moisture absorption and water absorption characteristics of the regenerated cellulose fiber itself. A functional agent can be allowed to act on the surface. Thereby, a more effective antibacterial deodorizing effect can be obtained.

In addition, the manufacturing method of the artificial hair fiber shown by this example is an example, and the procedure of each process, a chemical | medical agent used, an order, etc. are not limited to said thing. Moreover, the inorganic pigment, the functional agent, etc. shown in this example are examples, and are not limited to the above. Furthermore, the present invention can be modified and implemented without departing from the scope of the present invention.

2 Screen 1 Crushing chamber 4 Rotating blade 6 Fixed blade 14 Cutter blade Fa, Fb Rayon long fiber f1 First short fiber f2 Second short fiber

Claims

A method for producing artificial hair fibers used by being applied to the head,
A mixing step of adding and mixing an inorganic pigment and a functional agent in the cellulose solution;
A spinning step of spinning and fiberizing the cellulose solution obtained by the mixing step;
A cutting step of cutting the regenerated cellulose long fibers obtained by the spinning step into predetermined short fibers,
The functional agent is
It contains any one or more of a photocatalytic functional agent having a photocatalytic action, an organic polymer functional agent having a carboxyl group and having antibacterial properties, or a sulfur functional agent containing sulfur powder. A method for producing artificial hair fibers.
The cutting process
The regenerated cellulose long fiber is placed in a cylindrical crushing chamber formed of a perforated plate-like screen, and a plurality of rotating blades provided inside the crushing chamber are rotated, whereby the rotating blade, the screen, and The regenerated cellulose long fiber is pulverized by a shearing force and an impact force repeatedly generated between the blade edge of the rotary blade and a fixed blade that is in sliding contact or close to the first short fiber. And getting the steps
Cutting the regenerated cellulose long fibers into a length of 0.1 mm to 0.5 mm to obtain second straight fibers having a constant length and a substantially straight shape;
Mixing the first short fibers and the second short fibers in a predetermined ratio;
The method for producing artificial hair fibers according to claim 1, comprising:
The method for producing artificial hair fibers according to claim 1 or 2, wherein the cellulose solution is a viscose solution and the regenerated cellulose fibers are viscose rayon.
Artificial hair fibers used by being sprayed on the head,
The regenerated cellulose fiber constituting the artificial hair fiber contains an inorganic pigment and a functional agent,
The functional agent is
It contains any one or more of a photocatalytic functional agent having a photocatalytic action, an organic polymer functional agent having a carboxyl group and having antibacterial properties, or a sulfur functional agent containing sulfur powder. Artificial hair fiber.
The artificial hair fiber is composed of first short fibers that are irregular in length and are irregularly bent, and second short fibers that are constant in length and substantially linear. Artificial hair fiber.
The artificial hair fiber according to claim 4 or 5, wherein the regenerated cellulose fiber is viscose rayon.