JPH0742017A - Functional porous fiber and method for producing the same - Google Patents

Abstract

(57) [Summary] [Objective] To provide a functional porous fiber capable of very efficiently exhibiting the function of a particulate functional substance, and a method for producing the same. [Structure] The functional porous fiber comprises a fiber body made of a polyolefin resin and a large number of pores formed by mixing the paraffin wax with the polyolefin resin, melt-spinning, stretching, and removing the paraffin wax after heat treatment. , And functional particles carried on the fiber body. This fiber is manufactured by using 99.85-85 % by volume of a mixture of 100 parts by weight of polyolefin resin and 30-300 parts by weight of paraffin wax and 0.15 % by weight of functional particles .
15 % by volume, and the mixture obtained in the above step is melt-spun at a draft ratio of 400 or less to obtain unstretched fiber, and the unstretched fiber is heated at a strain rate of 400% or less to 1.
It can be obtained by a process of stretching the film by a factor of 4 to 5.0 to deposit a part of the functional particles on the surface, heat-treating it, and then removing the paraffin wax.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a functionalized porous fiber having functional particles made of a porous inorganic material such as activated carbon or silica gel, or organic functional particles such as a super absorbent resin. And a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, porous granular activated carbon has been known as a deodorant functional substance. Such a particulate functional substance is widely used, for example, as a deodorant for refrigerators, and in such applications, in order to exert its function effectively and efficiently, it is filled in a container having air permeability. The structure is adopted. However, the use in such a form has no problem when the area and the capacity are relatively small, but there is a problem in the use in a large area and a large capacity, and the use form is limited.

For this reason, recently, a method of adhering a particulate functional substance to a fiber or a non-woven fabric with an adhesive or a method of kneading a functional substance and a resin to prepare a mixture, and extruding and stretching the mixture. Thus, a method of forming a film or fiber into a film and depositing the particulate functional substance on the surface of the film or fiber is employed. According to this method,
Although it is possible to cope with diversification of usage forms as compared with the case where the functional substance is stored in the container, there are also technical problems described below.

[0004]

That is, the former method has a drawback that the particulate functional substance falls off during use. Further, in the latter method, there is no problem that the functional substance falls off, but only the exposed portion of the functional substance deposited on the surface of the film or fiber can exert its function effectively, and There is a problem that the remaining particles are not effectively used.

In this case, if the functional substance is a relatively inexpensive substance such as activated carbon, there are few economical problems, but many functional substances are expensive, and their functions are fully exhibited. It has been desired to develop a method that can be effectively used from the economical aspect. The present invention has been made in view of such problems, and an object thereof is to provide a functional porous fiber capable of exhibiting the function of a particulate functional substance very efficiently and a method for producing the same. To provide.

[0006]

In order to achieve the above-mentioned object, the present invention is a method in which a functional porous fiber is prepared by mixing a fiber body made of a polyolefin resin and paraffin wax with the polyolefin resin, and melt-spinning the mixture. It was composed of a large number of pores formed by removing the paraffin wax after stretching and heat treatment, and functional particles supported on the fiber body.

In this case, it is desirable that the pores have a major axis × minor axis of 1 μm × 2 μm or less, and the functional particles have a particle size of 1 to 10 μm. Further, the functional particles can be supported by 0.3 to 40% with respect to the unit volume of the fiber main body having the large number of pores. As a method for producing this functional porous fiber, 95 to 50% by volume of a mixture of 100 parts by weight of a polyolefin resin and 30 to 300 parts by weight of paraffin wax.
And 5 to 50% by volume of functional particles are mixed, the mixture obtained in the above step is melt-spun at a draft rate of 400 or less to obtain unstretched fibers, and the unstretched fibers are heated. It comprises a step of stretching 1.4 to 5.0 times at a strain rate of 400% or less to deposit a part of the functional particles on the surface, heat treatment, and then removing the paraffin wax. It is characterized by

The polyolefin resin that can be used in the present invention includes homo- or copolymers of α-olefins such as ethylene and propylene. In polyethylene, AS is used.
MFR value according to TM D1238 is 0.3 to 20 g / 1
0 minute, 0.5-9.0 g / 10 minutes for polypropylene are preferable. When the MFR value is out of the above range, the melt viscosity after melt-spinning after mixing with paraffin wax and functional particles becomes unsuitable, and problems occur during spinning. The paraffin wax used in the present invention is mainly composed of a saturated aliphatic hydrocarbon compound, and preferably has a melting point of about 50 to 70 ° C. from the viewpoint of workability of extraction with a solvent.

The functional particles usable in the present invention include activated carbon, coral sand, porous silicate minerals,
Inorganic particles mainly composed of silica gel, activated alumina, activated clay, activated titanium oxide, activated zinc oxide, etc., as well as particles treated with metal such as silver, copper, zinc, etc., organic particles made of super absorbent resin, etc. In particular, organic particles can be used as long as they do not deteriorate at the temperature at the time of melt extrusion and are not attacked by an organic solvent such as hexane or heptane used for extracting paraffin wax.

In the step of mixing the polyolefin resin, paraffin wax and functional particles to prepare a mixture, the mixture is mixed and kneaded in advance by a known method such as a masticating roller before the mixture is fed to the extruder for melt spinning. Alternatively, a known extruder having excellent mixing and kneading performance such as a twin-screw extruder may be attached with a spinning nozzle to directly perform melt spinning. The draft ratio during melt spinning, that is, the ratio of the drawing speed of the undrawn fiber to the discharge speed from the spinning nozzle is 400 or less in the case of polypropylene and 2 in the case of high-density polyethylene.
It must be 00 or less. When the draft ratio exceeds these values, the crystal size of polypropylene or polyethylene becomes small, the pore size becomes too small, and as a result, the porosity becomes low and the utilization efficiency of the functional particles remaining inside decreases. .

The unstretched fibers obtained under the above-mentioned conditions have a temperature range of 60 to 120 ° C. and a strain rate of 400% /
Stretched in minutes or less. If the stretching temperature is less than 60 ° C., cold stretching is performed, the shrinkage ratio after extraction of paraffin wax increases, the porosity decreases, and the utilization efficiency of the functional particles remaining inside becomes insufficient. Also, when the temperature exceeds 120 ° C,
Unstretched fibers are too soft, so effective stretching is not performed,
The fiber strength becomes low, which causes problems in processing into various forms.

The stretching ratio at this time is preferably in the range of 1.4 to 4.5 times, and when it is less than 1.4 times, the porosity becomes low, and when it exceeds 4.5 times, the pores are collapsed by stretching. As a result, the utilization of the functional particles remaining inside becomes insufficient. Following this drawing, the fibers are heat treated. The purpose of this heat treatment is to prevent the fiber from shrinking in the diameter direction and the length direction and reducing the porosity after the extraction of the paraffin wax with the organic solvent. It is preferable to carry out at a temperature higher than that.

The porous fiber, which becomes the carrier for the functional particles obtained by the above-mentioned production method, is limited to the porosity of pores with respect to the fiber body of 10% or more. The reason is that the porosity is 10
This is because if it is less than%, the performance of the functional particles remaining inside the fiber cannot be sufficiently brought out. The volume ratio (V) of the functional particles to the mixture during spinning is 50.
Limited to volume% or less. The reason is that the volume ratio is 50
If it exceeds%, the spinnability deteriorates, the yarn breakage occurs frequently, and stable spinning cannot be performed.

The volume ratio V of the functional particles is calculated by the following formula. V = V ₁ / (V ₁ + V ₂ + V ₃ ) × 100% V ₁ = Volume of functional particles V ₂ = Volume of polyolefin resin V ₃ = Volume of paraffin wax However, according to the production method of the present invention, spinning is performed. Even when the volume ratio of the functional particles to the mixture is limited to 15% by volume or less, the content of the functional particles in the obtained porous fiber can be 15% by volume or more. That is, the volume ratio of the functional particles to the mixture during spinning is 15% by volume.
With the above, yarn breakage occurs during spinning as described above, but in the manufacturing method of the present invention, since the paraffin wax is removed after melt spinning and stretching, and heat treatment, the volume ratio of the functional particles to the mixture during spinning is Is 15 vol% or less, the content of the functional particles in the obtained porous fiber can be 0, 15 vol% or more.

The porous fiber serving as a carrier for the functional particles obtained by the above production method has a pore size of about 1 μm × 2 μm (major axis × minor axis) or less when polyethylene is used as a raw material. Further, when polypropylene is used as the raw material, it is about 0.1 μm × 0.1 μm or less.
Therefore, the particle size of the functional particles to be mixed should be 1 to 10 μm.
Depending on the degree, the total amount of the functional particles does not fall off together with the paraffin wax in the steps of spinning, stretching, and heat-treating the polyolefin resin, the paraffin wax and the functional particles, and then removing the paraffin wax. It can be held inside the porous fiber.

[0016]

According to the method for producing a functional porous fiber having the above-mentioned structure, the polyolefin resin, the paraffin wax and the functional particles are mixed, and the mixture is spun to draw an undrawn fiber, which is then heat-treated, and thereafter, Since the paraffin wax is removed by extraction, the paraffin wax and the functional particles are filled between the crystals of the polyolefin resin (polyethylene, polypropylene) in the undrawn fiber state.

When the undrawn fiber in such a state is hot-drawn, the crystal interval of the resin is expanded, and when the paraffin wax is subsequently extracted and removed with an organic solvent, many relatively large pores are formed between the expanded crystals. To be done. Therefore, the obtained porous fiber has a very special structure. That is, the lamella crystal is transformed into zigzag by the hot drawing, the paraffin wax filled between these crystals is then extracted and removed, and the part where the paraffin wax is removed becomes pores. The layer of paraffin wax is continuous between the crystals of the polyolefin resin as it grows and shrinks to the inside of the fiber. For this reason, when the paraffin wax is extracted and removed, pores reaching the functional particles remaining inside are formed, and as a result, the functional particles remaining inside before the extraction of the paraffin wax are finely divided. It is connected to the outside through pores and allows the particles to fully exhibit their inherent functions.

The functional porous fiber produced in this manner firmly supports the functional particles without dropping them off, and makes full use of the capability of the functional particles supported by the functional porous fiber. Can be used as a raw material fiber.

[0019]

The preferred embodiments of the present invention will be described in detail below. Example of application as deodorant carrier or deodorant fiber Example 1 High-density polyethylene (HDPE) (manufactured by Mitsui Petrochemical Co., Ltd .; trade name Hi-Zex 2200J, MFR = 5.5): 45 Wt% (45 Paraffin wax (manufactured by Nippon Oil Co., Ltd .; trade name 145 ° paraffin): 45 WT% (47.3 Vol%) particulate porous silicate mineral (manufactured by Mizusawa Chemical Industry Co., Ltd .; trade name Mizukanite HP, Average particle size; 3 μm): 10 Wt% (7.3 Vol%) * (29.1 Vol%) mechanically mixed raw material with screw diameter 25 mm
Attach a nozzle of φ, 0.4mmφ × 160 hole,
It is supplied to a melt spinning machine set at 145 to 180 ° C., a winding speed is 200 m / min, and a draft rate is 80 at 10 d.
An unstretched fiber of e was produced.

Twelve multifilaments made of unstretched fibers thus obtained were collected and strained at a strain rate of 4 in an atmosphere at 110 ° C.
It was stretched 3 times at 0% / min and wound up. Then 110
Fixed length heat treatment for 1 hour in an oven at ℃, and then crimping 15 pieces / inch by mechanical crimping, 51mm
After being cut into staple fibers, the staple fibers were immersed in hexane at room temperature to remove the paraffin wax by extraction. The resulting porous fiber had a weight denier of 2.
It was 2 de, and the weight ratio of Mizukanite HP in the fiber was 18.2%. Therefore, the total amount of the mixed particulate porous silicate is retained in the fiber. FIG. 1 is a photomicrograph of the surface state of the porous fiber obtained in this example, and the portion protruding in a bump shape in the photo is Mizukanite particles. Comparative Example 1 High Density Polyethylene (HDPE) (manufactured by Mitsui Petrochemical Industry Co., Ltd .; trade name Hi-Zex 2200J, MFR = 5.5): 90 WT% (92.6 Vol%) particulate porous silicate mineral (Mizusawa Chemical Co., Ltd. Kogyo Co., Ltd .; trade name Mizukanite HP, average particle size; 3 μm): 10 Wt% (7.4 Vol%) * (29.7 Vol%) was supplied to the same melt spinning machine as in Example 1 to obtain paraffin wax. The steps other than the extraction and removal of were treated in the same manner as in Example 1 to obtain 3.7 de staple fibers. The weight ratio of Mizukanite HP in the obtained fiber was 10.0%. Comparative Example 2 High Density Polyethylene (HDPE) (manufactured by Mitsui Petrochemical Co., Ltd .; trade name Hi-Zex 2200J, MFR = 5.5): 37 Wt% (39.2 Vol%) paraffin wax (manufactured by Nippon Oil Co., Ltd .; Product name 145 ° paraffin): 37Wt% (40.9Vol%) Porous silicate mineral (manufactured by Mizusawa Chemical Co., Ltd .; Product name Mizukanite HP, average particle size: 3μm): 26Wt% (19.9Vol%) * (56.5% by volume) was used as a raw material and spun under the same conditions as in Example 1, but since the volume% of Mizukanite HP as an additive exceeded 50, spinning breakage occurred frequently.

Deodorizing performance comparison test between Example 1 and Comparative Example 1 2.2 g of the fiber of Example 1 and 4 of Comparative Example 1 were used so that the weight of Mizukanite HP, which is a deodorant, was 0.4 g.
g and take out ammonia concentration 1000pp
The mixture was placed in a 1000 ml Erlenmeyer flask adjusted to m and the ammonia concentration after a predetermined time elapsed was measured with a Kitagawa gas detector tube. In this comparative test, 0.4 g of particulate Mizukanite HP was used as a reference for a diameter of 10 mmφ and a height of 20 m.
The concentration of ammonia was measured by combining the lightly solidified columnar shape of m (Reference Example 1) and the case where the same amount of Mizukanite HP was scattered over the bottom of the Erlenmeyer flask (Reference Example 2). The measurement results are shown in Table 1 below.

[0022]

[Table 1] Removal rate (%) = (B−A) / B × 100 (%) A = Gas concentration in flask containing deodorant (ppm) B = Gas concentration in flask containing no deodorant (ppm) As is clear from the test results shown in Table 1, the porous fiber of Example 1 exhibits a deodorizing function at an early stage relative to Comparative Example 1, and its removal rate is also larger than that of Comparative Example 1. I understand.

As a porous fiber carrying a water absorbent resin
Application Example 2 Polypropylene (PP) (manufactured by Ube Industries, Ltd .; trade name UBE Polypro YK121, MFR = 3): 40 Wt% (43.6 Vol%) paraffin wax (manufactured by Nippon Oil Co., Ltd .; trade name 145) Paraffin): 40 Wt% (44.0 Vol%) Particulate super absorbent resin (manufactured by Mitsubishi Yuka Co., Ltd .; trade name Diawet, average particle size: 10 μm): 20 Wt% (12.4 Vol%) * ( 31.3 Vol%) mechanically mixed raw material with screw diameter of 25 mm
Attach a nozzle of φ, 0.4mmφ × 160 hole,
It is supplied to a melt spinning machine set at 175 to 200 ° C., a winding speed is 200 m / min, and a draft rate is 80 at 10 d.
An unstretched fiber of e was produced.

Twelve multifilaments made of the unstretched fibers thus obtained were collected and strained at a strain rate of 4 under an atmosphere of 110 ° C.
The film was stretched 2.9 times at 0% / min and wound up. Subsequently, the obtained fiber was subjected to heat treatment, mechanical crimping, and extraction / removal step of paraffin wax in the same manner as in Example 1. The obtained porous fiber had a weight denier of 2.2 de, and the weight ratio of diamond wet in the fiber was 33.3%. Comparative Example 3 Polypropylene (PP) (manufactured by Ube Industries, Ltd .; trade name UBE Polypro YK121, MFR = 3): 75 Wt% (82.0 Vol%) Paraffin wax (manufactured by Nippon Oil Co., Ltd .; trade name 145 ° paraffin) : 5Wt% (5.5Vol%) Particulate super absorbent resin (manufactured by Mitsubishi Yuka Co., Ltd .; trade name Diawet, average particle size: 10μm): 20Wt% (12.4Vol%) * (31.0Vol %) As a raw material and fed to the same melt spinning machine as in Example 2, and the same processes as in Example 2 were carried out except for extraction and removal of paraffin wax to obtain fibers.

Comparative Test of Water Absorption Performances of Example 2 and Comparative Example 3 The fibers (weight W ₁ ) of Example 2 and Comparative Example 3 were taken out so as to be 0.5 g in terms of water absorbing resin, and this was 200 mesh. In a bag made of polyester filter cloth, soaked in pure water for 24 hours to absorb water, and then desorbed water absorbed by a centrifugal dehydrator, and its amount (weight W ₂ )
Was measured. Then, the water absorption amount was determined as W ₂ −W ₁ .
The test results are shown in Table 2 below.

[0026]

[Table 2] As is clear from the results in Table 2, in the porous fiber of Example 2, the water absorption performance was exhibited earlier than in Comparative Example 3, the water absorption amount was large, and the water absorption amount per unit weight was doubled. You can see that it is above. Application Example of Porous Fiber Supporting Antimicrobial Agent Example 3 High Density Polyethylene (HDPE) (manufactured by Mitsui Petrochemical Co., Ltd .; trade name Hi-Zex 2200J, MFR = 5.5): 49.5 WT% ( Paraffin wax (manufactured by Nippon Oil Co., Ltd .; trade name 145 ° paraffin): 49.5 WT% (50.9 Vol%) Silver-based inorganic antibacterial agent (manufactured by Toagosei Chemical Industry Co., Ltd .; trade name) A porous fiber was produced under the same conditions as in Example 1, using Novalon, average particle size; 3 μm): 1.0 W% (0.3 Vol%) * (3.6 Vol%) as a raw material.

The obtained porous fiber had a weight denier of 2.2 de, and the weight ratio of Novalon in the fiber was 2.
It was 0%. Example 4 High-density polyethylene (HDPE) (manufactured by Mitsui Petrochemical Co., Ltd .; trade name Hi-Zex 2200J, MFR = 5.5): 47.5 WT% (48.1 Vol%) Paraffin wax (Nippon Oil Co., Ltd.) Manufactured; trade name 145 ° paraffin): 47.5 WT% (50.3 Vol%) Silver-based inorganic antibacterial agent (manufactured by Toagosei Chemical Industry Co., Ltd .; trade name Novalon, average particle size; 3 μm): 5 WT% ( 1.6 Vol%) * (16.3 Vol%) was used as a raw material, and a porous fiber was produced under the same conditions as in Example 1.

The obtained porous fiber had a weight denier of 2.2 de, and the weight ratio of Novalon in the fiber was 9.
It was 5%. Comparative Example 4 High Density Polyethylene (HDPE) (manufactured by Mitsui Petrochemical Co., Ltd .; trade name Hi-Zex 2200J, MFR = 5.5): 98 WT% (99.3 Vol%) Silver-based inorganic antibacterial agent (Toagosei Kagaku) Kogyo Co., Ltd .; trade name Novalon, average particle size; 3 μm): 2 WT% (0.7 Vol%) * (7.2 Vol%) as the raw material, except for the extraction and removal of paraffin wax A fiber was produced under the same conditions as above.

The obtained porous fiber had a weight denier of 2.4 de, and the weight ratio of Novalon in the fiber was 2.
It was 0%. Evaluation of antibacterial property In Examples 3 and 4 and Comparative Example 4, the same weight as that of Example 3 was taken out in Example 4 so that the amount of antibacterial agent was 0.016 g. Each fiber was placed in 25 ml of a phosphate buffer containing a fixed amount (5 × 10 ⁷ cells / ml) of Escherichia coli, vibrated at 37 ° C. for a predetermined time, and then the viable cell count in the buffer was measured. . The measurement results are shown in Table 3 below.

[0030]

[Table 3] As is clear from the results of Table 3 above, in the porous fibers of Examples 3 and 4, the viable cell count was reduced in a short time, and particularly in Example 4, the viable cell count became zero in 30 minutes. It can be seen that the porous fiber is extremely effective for antibacterial property. Example in which adsorption amount of deodorant fiber was increased Example 5 High density polyethylene (HDPE) (manufactured by Mitsui Petrochemical Co., Ltd .; trade name Hi-Zex 2200J, MFR = 5.5): 47.5 Wt% ( 47.2Vol%) Paraffin wax (manufactured by Nippon Oil Co., Ltd .; trade name 145 ° paraffin): 47.5WT% (49.3Vol%) particulate porous silicate mineral (manufactured by Mizusawa Chemical Industry Co., Ltd .; trade name) Porous fibers were prepared under the same conditions as in Example 1 using Mizukanite HP, average particle size; 3 μm): 5 Wt% (3.5 Vol%) as a raw material. The obtained porous fiber has a weight denier of 2.2d.
e, and the weight ratio of Mizukanite HP in the fiber is 10
It was wt%. Evaluation of Utilization Efficiency of Functional Particles in Deodorant Fiber 2 g of the fiber of Example 5 and Comparative Example 1 containing 10 wt% of Mizukanite HP, and 0.2 g of Mizukanite HP in the same amount as the amount contained therein were prepared as Reference Example 1. Then, these were used as samples. The deodorant performance was evaluated by adjusting the initial concentration of trimethylamine in the gas to 100 ppm.
The sample was put in a 00 cc Erlenmeyer flask and sealed, and after 1 hour, the concentration of trimethylamine remaining in the gas in the Erlenmeyer flask was measured by a Kitagawa gas detector tube.

For each sample, trimethylamine was repeatedly adsorbed by the above method, and after adsorbing an arbitrary amount of trimethylamine per unit weight of Mizukanite HP, the adsorption performance of Mizukanite HP in the sample was examined. FIG. 2 shows the test results of the samples of Example 5, Comparative Example 1, and Reference Example 1 in which the abscissa represents the adsorbed amount of trimethylamine per unit weight of the adsorbent and the ordinate represents the residual concentration of trimethylamine.

As is clear from the results shown in the figure, the porous fiber of Example 5 was slightly inferior in deodorizing performance to that of Mizukanite HP alone, but was larger in deodorizing performance than that of Comparative Example 1. It turns out that it can be obtained. Incidentally, in the mixing ratio of each functional particle in the above Examples and Comparative Examples,
The numerical value shown by * is the volume% with respect to the bulk specific gravity of each functional particle, and the numerical value without * is the volume% with respect to the density of each functional particle.

[0033]

As described above in detail in the embodiments,
According to the functional porous fiber and the method for producing the same according to the present invention, a large amount of functional particles are firmly supported on the fiber body,
The dropout is completely prevented, and moreover, many pores formed in the fiber body are connected to the functional particles, so that the function of the functional particles can be efficiently exhibited in a short time. Further, since the form is fibrous, it can be applied to various forms.

[Brief description of drawings]

FIG. 1 is a drawing-substitute micrograph showing the surface of a porous fiber obtained in Example 1 of the present invention.

FIG. 2 is a graph showing test results of utilization efficiency of the porous fibers obtained in the fifth example of the present invention and the functional particles of Comparative Example 1 and Reference Example 1.

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[Procedure amendment]

[Submission date] September 3, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

In this case, it is desirable that the pores have a major axis × minor axis of 1 μm × 2 μm or less, and the functional particles have a particle size of 1 to 10 μm. Further, the functional particles can be supported by 0.3 to 40% with respect to the unit volume of the fiber main body having the large number of pores. As a method for producing this functional porous fiber, 99.85-85 of a mixture of 100 parts by weight of a polyolefin resin and 30-300 parts by weight of paraffin wax.
Volume% and 0.15 to 15 volume% of functional particles, a step of melt-spinning the mixture obtained in the step at a draft ratio of 400 or less to obtain an unstretched fiber, and the unstretched fiber Under heating at a strain rate of 400% or less from 1.4 to
It is characterized in that it comprises a step of stretching the film to 5.0 times to deposit a part of the functional particles on the surface, followed by heat treatment, and thereafter removing the paraffin wax.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

The volume ratio V of the functional particles is calculated by the following formula. V = V ₁ / (V ₁ + V ₂ + V ₃ ) × 100% V ₁ = Volume of functional particles V ₂ = Volume of polyolefin resin V ₃ = Volume of paraffin wax However, according to the production method of the present invention, spinning is performed. Even when the volume ratio of the functional particles to the mixture is limited to 15% by volume or less, the content of the functional particles in the obtained porous fiber can be 15% by volume or more. That is, the volume ratio of the functional particles to the mixture during spinning is 15% by volume.
With the above, yarn breakage occurs during spinning as described above, but in the manufacturing method of the present invention, since the paraffin wax is removed after melt spinning and stretching, and heat treatment, the volume ratio of the functional particles to the mixture during spinning is there even equal to or less than 15 vol%, the content of functional particles of the obtained porous fibers can more than 15 vol%.

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Claims (4)

[Claims] 1. A fiber body composed of a polyolefin resin, a large number of pores formed by mixing paraffin wax with the polyolefin resin, melt-spinning, stretching, and heat-treating to remove the paraffin wax, and the fiber. A functional porous fiber comprising a functional particle supported on a main body. 2. The pores have a major axis × minor axis of 1 μm ×
2 μm or less, and the particle size of the functional particles is 1 to 10
The functional porous fiber according to claim 1, wherein the functional porous fiber has a thickness of μm. 3. The function according to claim 1, wherein the functional particles are supported by 0.3 to 40% with respect to a unit volume of the fiber main body having the large number of pores. Porous fiber. 4. A polyolefin resin of 100 parts by weight,
99.85-85% by volume of a mixture consisting of 30-300 parts by weight of paraffin wax and 0.15-functional particles.
15% by volume, a step of melt-spinning the mixture obtained in the above step at a draft ratio of 400 or less to obtain unstretched fiber, and heating the unstretched fiber at a strain rate of 400% or less. 1.
4 to 5.0 times, to deposit a part of the functional particles on the surface, heat treatment, and then to remove the paraffin wax, functional porosity Of producing high quality fiber.