TW202225093A - Carbon-powder-containing fiber and fibrous structure - Google Patents

Abstract

The present invention relates to carbon-powder-containing fibers that are fibers each containing a plant-derived carbon powder therein, wherein the carbon powder has a specific surface area of 250 m2/g or larger but less than 500 m2/g and the carbon powder is contained in an amount of 0.2-7 mass% with respect to the mass of the carbon-powder-containing fibers.

Description

Fibers and fibrous structures containing carbon powder

The present invention relates to fibers and fiber structures containing carbon powder.

Black original dyed yarn is used in black formal clothing or work clothes, etc., and in materials such as gloves or brushes, and carbon black is often used as the material for the yarn. Carbon black is generally produced by using petroleum-derived oil as a raw material, spraying it in the form of a mist, and burning it to produce carbon black. Because the particle size can be easily controlled, such a production method is often used.

For example, Patent Documents 1 and 2 disclose black dyed polyester fibers containing carbon black having a particle size, specific surface area, and the like in a predetermined range. Patent Document 3 also discloses fibers containing carbon powder such as charcoal and/or bamboo charcoal other than or in place of carbon black. In addition, Patent Document 4 also discloses fibers containing activated carbon. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2006-241640 [Patent Document 2] Japanese Patent Laid-Open No. 9-250026 [Patent Document 3] Japanese Patent Laid-Open No. 2002-249922 [Patent Document 4] Japanese Patent Laid-Open No. 2003-38626

[The problem to be solved by the invention]

The black original dyeing fibers described in Patent Documents 1 and 2 are fibers containing carbon black and do not have deodorizing properties. In addition, carbon black is a raw material derived from petroleum, and from the viewpoint of environmental protection, there is a need to use black raw dyed fibers that are not derived from petroleum. The fibers described in Patent Document 3 may contain charcoal and/or bamboo charcoal as carbon powder. However, if charcoal and bamboo charcoal are used to fully exert their deodorizing properties, it is necessary to use a large amount of carbon powder. However, when a large amount of charcoal and bamboo charcoal are contained, especially in the range of fine denier, the spinnability in the fiberizing step may be lowered, and the productivity may be lowered. In addition, there is a case in which a problem occurs due to a drop in workability due to toner fall off. The fibers containing activated carbon described in Patent Document 4 can have deodorizing properties, but the activated carbon easily scatters during fiber production, and therefore must be produced in a specific environment, and in this regard, the productivity cannot be said to be good. In addition, it is difficult to uniformly disperse the activated carbon in the fiber, so that the coloring uniformity of the black original dyed fiber may be insufficient.

Therefore, the present invention is an object of the present invention to provide a black raw dyed fiber having excellent deodorizing properties and coloring uniformity and good fiber productivity. [means to solve the problem]

The inventors of the present invention have made diligent studies to solve the above-mentioned problems, and finally completed the present invention. That is, the present invention includes the following suitable aspects. [1] A fiber containing carbon powder, characterized in that: carbon powder derived from plants is contained in the fiber, and the specific surface area of the carbon powder is not less than 250 m ² /g and less than 500 m ² /g, and relative to As for the mass of the fibers containing carbon powder, the content of the carbon powder is 0.2 to 7% by mass. [2] The carbon powder-containing fiber according to [1], wherein the carbon powder is carbon powder derived from coconut shells. [3] The carbon powder-containing fiber according to [1] or [2], wherein the fiber is a synthetic fiber or a semi-synthetic fiber. [4] The carbon powder-containing fiber according to [3], wherein the fiber is a polyester-based fiber or a polyamide-based fiber. [5] The carbon powder-containing fiber according to any one of [1] to [4], wherein the average particle diameter _D50 of the carbon powder is 1.5 μm or less. [6] The carbon powder-containing fiber according to any one of [1] to [5], wherein the value of D ₉₀ in the particle size distribution of the carbon powder is 4.0 μm or less. [7] The carbon powder-containing fiber according to any one of [1] to [6], whose single yarn fineness is 0.01 to 10 dtex. [8] A fiber structure comprising the carbon powder-containing fiber according to any one of [1] to [7]. [Effect of invention]

According to the present invention, it is possible to provide a black dyed fiber having excellent deodorizing properties and coloring uniformity and good fiber productivity. In addition, the carbon powder-containing fiber of the present invention is carbon neutral, and can also provide an environment-friendly black raw dyed fiber.

Hereinafter, embodiments of the present invention will be described in detail. In addition, the scope of the present invention is not limited to the embodiment described here, and various modifications can be made without departing from the gist of the present invention.

The fiber containing carbon powder of the present invention is characterized in that: the fiber contains carbon powder derived from plants, and the specific surface area of the carbon powder is 250 m ² /g or more and less than 500 m ² /g, and the specific surface area of the carbon powder is 250 m 2 /g or more and less than 500 m 2 /g. Regarding the mass of the fibers of the carbon powder, the content of the carbon powder is 0.2 to 7% by mass.

[carbon powder] The carbon powder contained in the carbon powder-containing fiber of the present invention is a carbon powder derived from a plant. Plant-derived carbon powder can be obtained from plants as the main raw material. Compared with carbon powders derived from non-plant-derived raw materials, such as carbon powders derived from petroleum, such as carbon black, carbon powders derived from plants are considered to have very special tissue structures derived from plants. Carbon powder with complex structure. In the present invention, since the carbon powder is a powder derived from a plant having a predetermined specific surface area, high deodorizing properties can be achieved by adding a small amount of the carbon powder. In addition, compared with carbon powder derived from minerals, petroleum, synthetic materials, etc., carbon powder derived from plants is carbon neutral, so it is also considered from the viewpoint of environmental protection and business. favorable.

In the present invention, the plant as the raw material of the plant-derived carbon powder is not particularly limited as long as the carbon powder having the above-specified specific surface area can be obtained, and examples thereof include coconut shells, coffee beans, tea leaves, and sugar cane. , fruit (sorrel, or banana), straw, or rice husk, etc. These plants may be used alone or in combination of two or more. The carbon powder derived from plants is preferably selected from coconut shells, coffee beans, tea leaves, sugar cane, fruits, straw, and rice from the viewpoint of more easily improving the deodorization properties and productivity of the black raw color fiber. At least one type of carbon powder derived from plants in the group consisting of shells is more preferably carbon powder derived from coconut shells. It is commercially advantageous to use coconut husks as a raw material plant because it can be obtained in large quantities.

As described above, it is difficult for carbon powders such as charcoal and bamboo charcoal to increase the specific surface area sufficiently. Generally, the specific surface area is not 250 m ² /g or more, and there are many difficulties in achieving sufficient deodorization performance with a small addition amount. In addition, since the specific gravity of the carbon powder is too low, the activated carbon tends to scatter when the fiber containing the carbon powder is produced, and the production conditions are limited. Not only that, because the specific surface area is too high, the productivity may be lowered due to aggregation, or the coloring uniformity may not be obtained. In addition, carbon black is not derived from a plant material, and has a shape in which there are voids in the particle, but few voids on the surface, so it cannot be said that it has sufficient deodorizing properties. Therefore, the carbon powder in the carbon powder-containing fiber of the present invention is preferably carbon powder other than bamboo charcoal, charcoal, activated carbon and carbon black. In addition, in this aspect, the fiber containing carbon powder of the present invention, as long as it contains carbon powder other than bamboo charcoal, charcoal, activated carbon and carbon black, and the carbon powder is not in the range that does not impair the effect of the present invention , it may further comprise carbon powder selected from the group consisting of bamboo charcoal, charcoal, activated carbon and carbon black.

The coconut used as the raw material of the coconut shell is not particularly limited, and examples thereof include palm coconut (oil palm), coconut, snake skin fruit, and sea coconut. The coconut shells obtained from these coconuts may be used alone or in combination of two or more. Among them, coconut shells derived from coconut or coconut palm are used as food, lotion raw materials, biodiesel raw materials, etc., and the biomass waste generated in large quantities is particularly preferred because of its easy availability and low price.

The specific surface area of the carbon powder contained in the carbon powder-containing fiber of the present invention is 250 m ² /g or more and less than 500 m ² /g. When the specific surface area of the carbon powder is less than 250 m ² /g, the amount of pores formed on the surface of the carbon powder is too small, so that the deodorizing properties of the obtained fiber are insufficient. In addition, since it is necessary to mix a large amount of carbon powder with the fiber in order to improve the deodorizing property, the productivity during fiber production is lowered, and the carbon powder tends to fall off during the fiber production and use. The specific surface area of the carbon powder is preferably 300 m ² /g or more, more preferably 330 m ² /g or more, and more preferably 300 m 2 /g or more, from the viewpoint of easily improving the deodorizing properties and productivity of the carbon powder-containing fiber. 360 m ² /g or more, more preferably 380 m ² /g or more, particularly preferably 400 m ² /g or more.

In addition, when the specific surface area of the carbon powder is 500 m ² /g or more, the specific gravity of the carbon powder becomes too low, so that the fibers are easily scattered when producing carbon powder-containing fibers, and the production conditions are limited. Not only that, because the specific surface area is too high, the productivity may be lowered due to aggregation, or the coloring uniformity may not be obtained. As the cause of aggregation, it is presumed that the increase in the specific surface area leads to an increase in surface energy, and the primary particles are likely to become unstable, and the functional groups exposed on the particle surface increase, and the electrostatic attraction increases, so that aggregation becomes easy. And similarly, when mixing with the component which comprises a fiber, carbon powder becomes easy to exist as an agglomerated state. As a result, it becomes difficult to uniformly disperse the carbon powder when the carbon powder is mixed with components such as the resin constituting the fiber, and the black color in the black original dye fiber tends to be uneven, and the obtained fiber containing the carbon powder is obtained. The color uniformity is reduced. In addition, in order to obtain uniformly colored black dyed fibers, it is necessary to lengthen the mixing time of the carbon powder and the components constituting the fibers before spinning. In addition, with regard to fibers having a small single-yarn fineness, yarn breakage increases when the fibers are spun due to agglomerates, thereby reducing productivity. The specific surface area of the carbon powder is preferably not more than 480 m ² /g, more preferably not more than 470 m ² /g, and still more preferably not more than 480 m 2 /g from the viewpoint of easily improving the coloring uniformity and productivity of fibers containing the carbon powder 460 m ² /g or less, more preferably 450 m ² /g or less. The specific surface area of the carbon powder is the BET specific surface area that can be calculated by the nitrogen adsorption method, for example, can be calculated by the method described in the examples. The specific surface area of the carbon powder can be measured by using the carbon powder used as a raw material when manufacturing the fiber containing the carbon powder as a measurement sample, or by adding the resin constituting the fiber from the fiber containing the carbon powder. The carbon powder obtained by dissolving and removing was measured as a measurement sample.

As a manufacturing method of the carbon powder which has a specific surface area in the said range, the method of baking the plants exemplified above is mentioned. The method of calcining a plant to produce carbon powder is not particularly limited, and it can be produced by a method known in the art. For example, it can be produced by subjecting a plant as a raw material to heat treatment (carbonization) for about 1 to 20 hours in an inert gas atmosphere, for example, at a temperature of about 300°C or more and 900°C or less. In order to adjust the specific surface area to a desired range, the carbon powder obtained by the above-mentioned firing step may be pulverized and/or classified. In particular, when a plant with a high hardness such as coconut shell is used as a plant, there is a tendency that coarse powder tends to remain at the time of pulverization. Therefore, it is preferable to remove the coarse powder by the pulverization and/or classification step from the viewpoint of easily improving the productivity of the fiber containing carbon powder.

The inert gas is not particularly limited as long as it is a gas that does not react with the carbon powder at the above-mentioned firing temperature. However, for example, nitrogen, helium, argon, krypton, or a mixed gas thereof can be mentioned, preferably nitrogen. In addition, the concentration of impurity gas, especially oxygen, contained in the inert gas is preferably as low as possible. As a generally allowable oxygen concentration, 0 to 2000 ppm is preferable, and 0 to 1000 ppm is more preferable.

The pulverizer used for pulverization is not particularly limited, and for example, a bead mill, a jet mill, a ball mill, a hammer mill, or a rod mill can be used alone or in combination. From the viewpoint of easily obtaining powder having a desired specific surface area and the like, a jet mill having a classification function is preferred. On the other hand, when using a ball mill, a hammer mill, a rod mill, or the like, it can be adjusted to a desired specific surface area by classifying after pulverization.

The specific surface area and the like can be adjusted more accurately by classifying after the pulverization treatment. As classification, classification by a sieve, wet classification, or dry classification is mentioned. Examples of the wet classifier include those using principles such as gravity classification, inertial classification, hydraulic classification, or centrifugal classification. Moreover, as a dry classifier, the classifier utilizing the principle of sedimentation classification, mechanical classification, or centrifugal classification is mentioned.

When the pulverization step is performed, pulverization and classification can also be performed using one apparatus. For example, using a jet mill with dry classification function, it can be pulverized and classified. In addition, a pulverizer and a classifier can also be used independently of each other. In this case, pulverization and classification may be performed continuously or discontinuously.

The carbon powder obtained by sintering plants under the above temperature conditions is also an intermediate product in the production process of activated carbon, for example. When producing activated carbon, the carbon powder obtained in the above manner is further subjected to an activation treatment step. Activation treatment is a treatment of forming pores on the surface of carbon powder and changing it into a porous carbonaceous material, thereby producing activated carbon with a large specific surface area and a pore volume. As the activation treatment, there are, for example, a gas activation treatment, a chemical activation treatment, and the like. The carbon powder contained in the carbon powder-containing fiber of the present invention has a specific surface area in the above-mentioned range, and the carbon powder having such a specific surface area is an unactivated carbon powder, not an activated carbon that has undergone an activation treatment. Activated carbon has a specific surface area higher than 500 m ² /g, and also based on this point, it is not included in the carbon powder of the carbon powder-containing fiber of the present invention. In addition, in the production step of activated carbon, in order to improve the performance of the battery material or purification material produced by using activated carbon, before performing the above-mentioned activation treatment, there is also a step of removing fine powder of carbon powder as an intermediate product situation. The removed micropowder is usually discarded or used as fuel, but according to the present invention, it is possible to upcycle the waste micropowder as a functional material.

Whether the carbon powder is activated can be confirmed by confirming the structure of the carbon powder using a machine such as a transmission electron microscope (TEM) or a scanning electron microscope (SEM). Therefore, the carbon powder included in the carbon powder-containing fiber of the present invention preferably has a specific surface area in the above-mentioned range, in which a generally formed structure due to activation treatment is not observed in a TEM or SEM image. of carbon powder.

The average particle diameter D ₅₀ included in the particle size distribution of the carbon powder of the carbon powder-containing fiber of the present invention is preferable from the viewpoint that the spinnability can be easily improved and the specific surface area can be easily adjusted to the above-mentioned range. It is 1.5 μm or less, more preferably 1.3 μm or less, still more preferably 1.2 μm or less, still more preferably 1.0 μm or less, particularly preferably 0.8 μm or less, and still more preferably 0.7 μm or less. Further, the average particle diameter D ₅₀ is preferably 0.03 μm or more, more preferably 0.05 μm or more, and still more preferably 0.1 μm or more, from the viewpoint that secondary aggregation is likely to occur when the particle diameter is too small.

D ₉₀ included in the particle size distribution of the carbon powder of the carbon powder-containing fiber of the present invention is preferably 4.0 μm or less, more preferably from the viewpoint of easily improving spinnability by removing coarse particles It is 3.5 micrometers or less, More preferably, it is 3.0 micrometers or less, More preferably, it is 2.5 micrometers or less. Moreover, D ₉₀ is preferably 0.1 μm or more, more preferably 0.2 μm or more, and still more preferably 0.5 μm or more, from the viewpoint that secondary aggregation is likely to occur when the particle size is too small. D ₅₀ and D ₉₀ in the particle size distribution of the carbon powder can be measured using, for example, a centrifugal automatic particle size distribution analyzer.

[fiber] The carbon powder-containing fiber of the present invention is a fiber containing the above-mentioned general carbon powder in the fiber. Here, the carbon powder is contained in the fiber means that the carbon powder is contained in the fiber. Moreover, a part of carbon powder may exist on the fiber surface. The fibers are not particularly limited as long as they can contain carbon powder inside and can be processed into a fibrous form, and examples thereof include synthetic fibers, semi-synthetic fibers, and the like. The fibers are preferably synthetic fibers or semi-synthetic fibers from the viewpoints that the carbon powder is easily contained in the fibers and the spinning is facilitated.

Examples of synthetic fibers include polyester-based fibers, polyamide-based fibers, polyurethane-based fibers, polyolefin-based fibers, acrylic fibers, vinyl-based fibers, polyarylate-based fibers, and polystyrene-based fibers Wait. As semisynthetic fibers, regenerated cellulose fibers, cellulose derivative fibers, regenerated protein fibers, and the like can be mentioned.

The polyester-based fiber is a fiber containing a polyester-based resin as a main component. Polyester resins are resins with aromatic dicarboxylic acid as the main acid component and have the ability to form fibers, such as polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate Diester, polytetramethylene terephthalate, polyethylene terephthalate, polyethylene 2,6-naphthalate. In addition, these polyesters may be copolymers obtained by copolymerizing an alcohol component such as butanediol or a dicarboxylic acid such as isophthalic acid as the third component, and may also be these various polyesters. the mixture. Among these, a polyethylene terephthalate-based polymer is preferable from the viewpoint of handling properties and cost.

The polyamide-based fiber is a fiber containing a polyamide-based resin as a main component. Polyamide resins are polymers having repeating structural units bound by amide bonds, and polyamide fibers are also called nylon. In addition, the polyaramid fiber containing an aromatic polyamide polymer is also included in the polyamide fiber. Examples of the polyamide-based resin include aliphatic polyamides such as polyamide 6, polyamide 66, polyamide 610, polyamide 10, polyamide 12, polyamide 6-12, and the like. Its copolymers, semi-aromatic polyamides synthesized from aromatic dicarboxylic acids and aliphatic diamines, etc.

The polyurethane-based fiber is a fiber containing a polyurethane-based resin as a main component, for example, elastic fiber and the like. The polyolefin-based fiber is a fiber containing a polyolefin-based resin as a main component, and examples thereof include polyethylene fibers, polypropylene fibers, and polymethylpentene fibers. The acrylic fiber is a fiber containing an acrylic resin as a main component, and examples thereof include acrylic fiber, modified polyacrylonitrile fiber, and the like. The vinyl-based fiber is a fiber containing a vinyl-based resin as a main component, and examples thereof include polyvinyl alcohol fibers, ethylene-vinyl alcohol copolymer fibers, and vinyl chloride fibers.

Regenerated cellulose fibers and cellulose derivative fibers are fibers composed of cellulose and/or derivatives thereof as main components, and examples thereof include rayon, cupro, and lyocell. The regenerated protein fiber is a fiber composed of protein extracted from a protein-containing material, and examples thereof include soybean protein fiber, cow's milk casein fiber, and the like.

In a suitable aspect of the carbon powder-containing fiber of the present invention, the fiber is preferably a polyester-based fiber or a polyamide-based fiber from the viewpoints of easy kneading of the powder and versatility of the fiber.

[Fiber containing carbon powder] The fiber containing carbon powder of the present invention contains carbon powder derived from plants in the fiber. The content of the carbon powder in the carbon powder-containing fiber is 0.2 to 7% by mass relative to the mass of the carbon powder-containing fiber. When the content of carbon powder is less than 0.2 mass %, sufficient deodorizing property cannot be obtained because the content of carbon powder is insufficient. The content of the carbon powder is preferably 0.25 mass % or more, more preferably 0.3 mass % or more, and still more preferably 0.4 mass % with respect to the mass of the carbon powder-containing fiber from the viewpoint of easily improving the deodorizing property. % or more, more preferably 0.5 mass % or more. In applications requiring higher deodorizing properties, the content of the carbon powder is preferably 1 mass % or more, more preferably 3 mass % or more, relative to the mass of the carbon powder-containing fiber. In addition, when the content of carbon powder in the carbon powder-containing fiber exceeds 7% by mass, the yarn breakage of the fiber during spinning cannot be sufficiently suppressed, so the productivity of the carbon powder-containing fiber will decrease. The content of the carbon powder is preferably 6.5 mass % or less, more preferably 6 mass % or less, still more preferably 5.5 mass % or less, from the viewpoint of easily improving the productivity of the carbon powder-containing fiber, and furthermore More preferably, it is 5 mass % or less.

The single-yarn fineness of the carbon powder-containing fiber is preferably 0.01 to 10 dtex from the viewpoints of spinnability and texture. When the single yarn fineness is equal to or greater than the above lower limit value, it is easy to sufficiently suppress the occurrence of yarn breakage of the fibers during spinning. The single-yarn fineness is more preferably 0.05 dtex or more, and more preferably 0.1 dtex or more, from the viewpoint of improving the spinnability. In addition, when the single-yarn fineness is below the above-mentioned upper limit value, when the fiber is used to manufacture a knitted fabric or a woven fabric, the finished product can be made soft and a good texture can be easily obtained. From the viewpoint of producing a product with good texture, the single yarn fineness is preferably 7 dtex or less, and more preferably 4 dtex or less.

The total fineness of the fiber containing carbon powder is not particularly limited, and can be appropriately set according to the application of the fiber containing carbon powder. However, from the point of view of spinnability and versatility, the fineness is preferably 15-300 dtex, More preferably, it is 20-200 dtex, and the number of filaments is preferably 2-200 filaments, more preferably 3-100 filaments.

The strength of the fiber containing carbon powder is not particularly limited, and it can be appropriately set according to the purpose of using the fiber containing carbon powder. However, it is easy to prevent possible breakage due to wear of the yarn guide (guide) during knitting. From the viewpoint of yarn or pilling, it is preferably 1 cN/dtex or more, more preferably 1.5 cN/dtex or more, and still more preferably 2 cN/dtex or more. The upper limit of the strength is not particularly limited, but the strength obtained by a general melt spinning method is about 5.0 cN/dtex or less.

The elongation of the carbon powder-containing fiber is not particularly limited, and can be appropriately set according to the application of the carbon powder-containing fiber. However, from the viewpoint of yarn workability, it is preferably 10% or more, more preferably 20%. % or more, more preferably 30% or more. The upper limit of the elongation is not particularly limited, but from the viewpoint of rationality of the product form, it is preferably 150% or less, more preferably 100% or less.

The cross-sectional form of the fiber containing carbon powder may be a fiber of various cross-sectional forms such as a flat cross-section, a multi-lobal cross-section, and a hollow cross-section, in addition to a circular cross-section. Fibers containing carbon powder may also be fibers having a core-sheath structure.

In the fiber containing carbon powder of the present invention, as long as the effect of the present invention is not impaired, any additives may be contained as necessary. Examples of such additives include antioxidants, plasticizers, thermal stabilizers, ultraviolet absorbers, antistatic agents, lubricants, fillers, other polymer compounds, and the like. These may be used alone or in combination of two or more.

[Manufacturing method of fiber containing carbon powder] The fiber containing carbon powder of the present invention can be produced using a conventionally known spinning device using the above-mentioned components constituting the fiber, carbon powder, other components and additives as needed, and the like. For example, the spinning can be performed by a melt spinning method, specifically, a method of melt spinning at a low speed or a medium speed followed by stretching, a direct spinning method by a high speed, simultaneous spinning after spinning, or continuous stretching It can be produced by any production method such as false twist method.

As an example of a specific manufacturing method, the components constituting the fibers, carbon powder, and a composition containing other optional components are melted in a melt extruder, the molten polymer stream is directed to the spinning head, and the amount is measured by a gear pump. , it is discharged from a spinning nozzle of a desired shape, and if necessary, a stretching treatment or the like is performed, and then the fiber of the present invention is produced by winding. The mixing of the components constituting the fibers and the carbon powder can be performed by directly mixing these, or by mixing a part of the components with the carbon powder in advance to obtain a master batch, and then the master batch is mixed with the constituting fibers. The ingredients are mixed and carried out. The melting temperature during spinning can be appropriately adjusted according to the melting point of the constituents of the fiber, but generally it is preferably about 150 to 300°C. The sliver discharged from the spinning nozzle can be directly wound at high speed without being stretched, or stretched as needed. The stretching operation is usually carried out at a stretching ratio of 0.55 to 0.9 times the elongation at break (HDmax) at a temperature above the glass transition point of the constituents constituting the fiber. If the elongation ratio is less than 0.55 times the elongation at break, it will be difficult to obtain fibers with sufficient strength stably, and if it exceeds 0.9 times the elongation at break, the yarn will be easily broken.

There are cases in which the stretching is performed after being discharged from the spinning nozzle, temporarily wound up and then stretched, and the case in which the stretching is carried out successively. However, in the present invention, any one of them may be used. The stretching operation is usually performed by thermal stretching, and can be performed using any one of hot air, hot plate, hot roll, water bath, and the like. In addition, the drawing speed is different in the case of temporarily winding and then carrying out the stretching process, in the case of directly continuing the spinning and extending in one step, and in the case of performing the spinning, stretching and rewinding in one step, and in the case of high-speed direct winding without stretching. , but it is roughly within the range of 500 ~ 6000m/min to pull. If it is less than 500m/min, productivity will be lowered, and fiber breakage is likely to occur at ultra-high speeds such as more than 6000m/min. In addition, the cross-sectional shape of the fiber of the present invention is not particularly limited, and a normal melt spinning method can be used to form a perfect circular, hollow, or special-shaped cross-section according to the shape of the nozzle. Furthermore, it may have a core-sheath structure composed of a core portion or a sheath portion composed of a component constituting the fiber and a composition containing carbon powder, and a sheath portion or a core portion containing a component constituting the fiber. From the viewpoint of the passability of the fiberizing or weaving step, a true circle is preferable.

[fiber structure] The carbon powder-containing fiber of the present invention can be used as various fiber structures (fiber aggregates), and the present invention also provides a fiber structure containing the carbon powder-containing fiber of the present invention. Here, "fiber structure" may refer to multifilament yarns, textile yarns, woven fabrics, non-woven fabrics, paper, artificial leather, and fillers made only of the carbon powder-containing fibers of the present invention; or may also be a part of Woven fabrics or non-woven fabrics made of the fibers containing carbon powder of the present invention, interwoven fabrics, blended yarns, blended yarns, twisted fibers such as natural fibers, chemical fibers, synthetic fibers, semi-synthetic fibers and other fibers Woven fabrics, blended non-woven fabrics, fiber laminates, etc. used as processing yarns such as yarns, intertwined yarns, or shrinked yarns.

The fiber containing carbon powder of the present invention and the fiber structure containing the fiber containing carbon powder of the present invention have excellent deodorizing properties and uniformity of black coloration. Therefore, the fibers and fiber structures containing carbon powder of the present invention can be used as clothing products such as shirts, pants, coats, uniforms, work clothes, underwear, pantyhose, socks, sports clothing, black formal clothing, etc. , curtains, carpets and other indoor fabrics, gloves, brushes, filter materials, sheets and other materials and products are used. [Example]

Hereinafter, the present invention will be described by way of examples, but the present invention is not limited to these examples. In addition, the % in the embodiment, as long as there is no special proviso, are all about the quality. First, the measurement method of each physical property value is demonstrated.

[Particle Size Distribution Measurement Method] D ₅₀ and D ₉₀ of the carbon powder were obtained by measuring particle size distribution with a centrifugal automatic particle size distribution analyzer CAPA-500 manufactured by Horiba Manufacturing Co., Ltd.

[Specific surface area] The specific surface area of the carbon powder was measured using a high-precision surface area/pore distribution measuring device (“BELSORP28SA” manufactured by Mackbeier Co., Ltd.). The measurement sample was vacuum degassed at 300° C. for 5 hours, and then measured for the nitrogen adsorption isotherm at 77K. Using the obtained adsorption isotherm, the multi-point method was analyzed by the BET formula, and the specific surface area was calculated from the straight line in the region of relative pressure P/P ₀ =0.01 to 0.1 of the obtained curve.

[Production Example 1: Production of Coconut Shell Carbon Powder 1] Coconut shell fragments were fired (carbonized) at 500° C. in a nitrogen atmosphere, washed and dried, dry pulverized, and classified to recover fine powder. The particle size at this time was D ₅₀ =1.5 μm and D ₉₀ =3.8 μm. Then, dry pulverization was performed again, and coconut shell carbon powder 1 was obtained. The particle size of the coconut shell carbon powder 1 is D ₅₀ =0.7 μm, D ₉₀ =2.2 μm, and the specific surface area is 440 m ² /g.

[Production Example 2: Production of Coconut Shell Carbon Powder 2] Coconut shell fragments were calcined (carbonized) at 500° C. in a nitrogen atmosphere, washed and dried, dry pulverized and classified, and the fine powder was recovered. Obtain coconut shell carbon powder 2. The particle size of the coconut shell carbon powder 2 is D ₅₀ =1.3 μm, D ₉₀ =3.8 μm, and the specific surface area is 420 m ² /g.

[Production Example 3: Production of Coconut Shell Carbon Powder 3] Coconut shell fragments were fired (carbonized) at 450° C. in a nitrogen atmosphere, washed and dried, dry pulverized, and classified to recover fine powder. The particle size at this time was D ₅₀ =1.5 μm and D ₉₀ =3.8 μm. Then, dry pulverization was performed again, and the coconut shell carbon powder 3 was obtained. The particle size of the coconut shell carbon powder 3 is D ₅₀ =0.8 μm, D ₉₀ =2.2 μm, and the specific surface area is 270 m ² /g.

[Production Example 4: Production of Coconut Shell Carbon Powder 4] Coconut shell fragments were fired (carbonized) at 400°C in a nitrogen atmosphere, washed and dried, dry pulverized, and classified to recover fine powder. The particle size at this time was D ₅₀ =1.5 μm and D ₉₀ =3.8 μm. Then, dry pulverization was performed again, and coconut shell carbon powder 4 was obtained. The particle size of the coconut shell carbon powder 4 is D ₅₀ =0.8 μm, D ₉₀ =2.4 μm, and the specific surface area is 190 m ² /g.

[Manufacture example 5: manufacture of charcoal fine powder] The wood of oak oak was fired at 1200° C., then rapidly cooled to 350° C. to manufacture white charcoal (binchotan), which was dry pulverized to obtain charcoal fine powder. The particle size of the obtained charcoal micropowder is D ₅₀ =0.5 μm, D ₉₀ =1.9 μm, and the specific surface area is 240 m ² /g.

[Example 1] The coconut shell carbon powder 1 obtained in Production Example 1 was added to polyamide 6 (nylon 6 1011FK manufactured by Ube Industries Co., Ltd.), so that the carbon powder 1 was finally obtained relative to the quality of the fiber containing the carbon powder. The content was the ratio of the content shown in Table 1, and the resin composition was obtained by kneading at a temperature of 280 to 300° C. using a twin-screw extruder. The obtained resin composition was spun at a spinning temperature of 250° C. and a discharge rate of 29.4 g/min using a nozzle having 24 holes and a circular cross-sectional shape. After blowing the cooling air with a temperature of 25°C and a humidity of 60% to the spinning sliver at a speed of 1.0m/s, it was introduced into a 1.0m-long, inlet guide (guide ) A tubular heater with a diameter of 8mm, an outlet guide diameter of 10mm, and an inner diameter of 30mmφ (internal temperature 160°C). After being extended in the tubular heater, the yarn sliver coming out of the tubular heater is supplied with oil by an oil jet, and is wound at a speed of 3500m/min through 2 take-up rollers to obtain 84dtex/24 filaments containing carbon. Fiber of Powder 1.

[Examples 2 and 3] Fibers 2 and 3 containing carbon powder were obtained in the same manner as in Example 1, except that the content of the coconut shell carbon powder 1 was changed to the amount shown in Table 1.

[Example 4] Fiber 4 containing carbon powder was obtained in the same manner as in Example 2, except that the cross-sectional shape of the metal nozzle was used.

[Example 5] The coconut shell carbon powder 1 was added to polyamide 6 (nylon 6 1011FK manufactured by Ube Industries Co., Ltd.), and the content of the carbon powder 1 relative to the quality of the fiber containing the carbon powder finally obtained is shown in the table. Kneading was carried out at the content ratio shown in 1, and the resulting resin composition was used as a sheath component, and polyamide 6 (nylon 6 1015B, manufactured by Ube Industries, Ltd.) was used as a core component. Fiber 5 containing carbon powder was obtained in the same manner as in Example 1, except that the metal nozzle whose cross-sectional shape was a core-sheath shape was used.

[Example 6] Fiber 6 containing carbon powder was obtained in the same manner as in Example 2, except that the coconut shell carbon powder 2 obtained in Production Example 2 was used in place of the coconut shell carbon powder 1.

[Example 7] Fiber 7 containing carbon powder was obtained in the same manner as in Example 2, except that the coconut shell carbon powder 3 obtained in Production Example 3 was used in place of the coconut shell carbon powder 1.

[Example 8] Using a metal nozzle with 96 holes and a circular cross-sectional shape, spinning was performed at a spinning temperature of 250°C, a discharge rate = 29.4 g/min, and the fineness was changed to 84 dtex/96 filaments in the same manner as in Example 1. , to obtain fiber 8 containing carbon powder.

[Comparative Examples 1 and 2] Fibers 9 and 10 containing carbon powder were obtained in the same manner as in Example 1 except that the content of the coconut shell carbon powder 1 was changed to the amount shown in Table 1.

[Comparative Example 3] A fiber 11 containing carbon powder was obtained in the same manner as in Example 2, except that the coconut shell carbon powder 4 obtained in Production Example 4 was used in place of the coconut shell carbon powder 1.

[Comparative Example 4] In the same manner as in Example 2, except that the charcoal fine powder obtained in Production Example 5 was used in place of the coconut shell carbon powder 1, the fiber 1 containing the charcoal fine powder was obtained.

[Comparative Example 5] Carbon black (“VULCAN XC-72” manufactured by Cabot Corporation, specific surface area: 214 m ² /g) was used, and the content of the coconut shell carbon powder 1 was replaced by the content shown in Table 1. In the same manner as in Example 1, fibers containing carbon black were obtained.

[Comparative Example 6] In the same manner as in Example 1, except that activated carbon ("KURARAY COAL PW-D" manufactured by Kuraray Co., Ltd., specific surface area: 1500 m ² /g) was used in place of the coconut shell carbon powder 1, a product containing Activated carbon fiber.

[Comparative Example 7] In the same manner as in Comparative Example 4, except that the content of the charcoal fine powder was changed to the amount shown in Table 1, the fiber 2 containing the charcoal fine powder was obtained.

About the fibers of Examples and Comparative Examples obtained as described above, yarn color irregularity, spinning properties, and deodorizing properties were evaluated in the following manner. The results obtained are shown in Table 1.

[Evaluation of yarn color irregularity] Using the fibers of Examples and Comparative Examples, after making circular knitting with a tubular weaving machine, using a spectrophotometer "CM-3700A" manufactured by Konica Minolta Co., Ltd., it was treated with regular reflection. : SCE, measuring diameter: LAV (25.4mm), UV condition: 100% FULL, field of view: 2˚, main light source: C light source to measure the L ^* value of the cylinder net. The measurement was performed 5 times, the difference between the maximum value and the minimum value of the obtained measurement results was calculated, and the yarn color irregularity was evaluated according to the following criteria. The smaller the difference between the maximum value and the minimum value, the smaller the inconsistency of hair color. ○: The difference between the maximum value and the minimum value of the L ^* value is less than 2 ×: The difference between the maximum value and the minimum value of the L ^* value is 2 or more Also, in the case of the fiber obtained in Example 1, the difference between L ^* The minimum value is 19.2, the maximum value is 19.8, and the difference is 0.6. In the case of the fiber obtained in Example 6, the minimum value of L ^* was 17.8, the maximum value was 18.3, and the difference was 0.5. On the other hand, in the case of the fiber obtained in Comparative Example 6, the minimum value of L ^* was 17.0, the maximum value was 19.2, and the difference was 2.2.

[Evaluation of Spinning Properties] Under the conditions of the above-mentioned Examples and Comparative Examples, when fibers were continuously produced for 12 hours, the number of occurrences of yarn breakage was measured, and the evaluation was performed according to the following criteria. ◎: The number of yarn breaks in 12 hours is less than 1 time ○: The number of occurrences of yarn breakage in 12 hours is more than 2 times and less than 10 times ×: The number of yarn breaks in 12 hours is 11 or more

[Evaluation of deodorizing properties] In accordance with the test method for deodorization in compliance with the SEK mark fiber product certification standard of the general chemical inspection and inspection agency, the test was carried out by the detection tube method using ammonia, and the residual concentration of ammonia after 2 hours was measured. In addition, the deodorizing property was evaluated according to the following criteria. ◎: The residual concentration of ammonia after 2 hours is 20% or less ○: The residual concentration of ammonia after 2 hours is more than 20% and less than 50% ×: The residual concentration of ammonia after 2 hours is more than 50%

The carbon powder-containing fibers of Examples 1 to 8 have a carbon powder content of 0.2 to 7 mass % relative to the carbon powder-containing fiber mass, and a carbon powder specific surface area of 250 m ² /g or more Less than 500 m ² /g, it has spinnability and deodorizing properties, and it is confirmed that there are few yarn stains. On the other hand, in the case of Comparative Example 1 in which the content of the carbon powder was as small as 0.1 mass %, sufficient deodorizing properties could not be obtained. In addition, in the case of Comparative Example 2 in which the content of the carbon powder was higher than 7% by mass, yarn breakage occurred during fiber production, and it could not be said that the spinnability was sufficient. In Comparative Example 3 containing carbon powder having a specific surface area of 190 m ² /g, Comparative Example 4 using charcoal fine powder, and Comparative Example 5 using carbon black, sufficient deodorizing properties could not be obtained. In addition, in the case of Comparative Example 6 using activated carbon, uniform colorability could not be obtained. In addition, in Comparative Example 7 in which a large amount of charcoal fine powder was used, deodorant properties were obtained, but spinning properties were extremely poor.

Claims (8)

A fiber containing carbon powder, characterized in that: carbon powder derived from plants is contained in the fiber, and the specific surface area of the carbon powder is not less than 250 m ² /g and less than 500 m ² /g, and the specific surface area of the carbon powder is more than 250 m 2 /g As for the quality of the final fibers, the content of the carbon powder is 0.2 to 7 mass %. The fiber containing carbon powder according to claim 1, wherein the carbon powder is carbon powder derived from coconut shells. The fiber containing carbon powder according to claim 1 or 2, wherein the fiber is a synthetic fiber or a semi-synthetic fiber. According to the carbon powder-containing fiber of claim 3, the fiber is polyester-based fiber or polyamide-based fiber. The carbon powder-containing fiber according to any one of claims 1 to 4, wherein the average particle size _D50 of the carbon powder is 1.5 μm or less. The carbon powder-containing fiber according to any one of claims 1 to 5, wherein the value of D ₉₀ in the particle size distribution of the carbon powder is 4.0 μm or less. The fiber containing carbon powder according to any one of claims 1 to 6 has a single yarn fineness of 0.01 to 10 dtex. A fiber structure comprising the carbon powder-containing fiber according to any one of claims 1 to 7.