KR102166565B1 - Core-sheath type activated carbon composite fiber and method for preparing the same and absorbent for comprising the same - Google Patents

Abstract

The present invention relates to a core-sheath type activated carbon composite fiber, a method for producing the same, and an adsorbent including the same. The present invention maintains excellent mechanical strength.

Description

Core-sheath type activated carbon composite fiber, its manufacturing method, and adsorbent containing the same {CORE-SHEATH TYPE ACTIVATED CARBON COMPOSITE FIBER AND METHOD FOR PREPARING THE SAME AND ABSORBENT FOR COMPRISING THE SAME}

The present invention relates to a core-sheath type activated carbon composite fiber, a method for producing the same, and an adsorbent including the same.

Activated carbon fibers are activated carbon fibers based on them, and activated carbon fibers have pores formed from the surface in the order of macro, meso, and micro pores.

In contrast, activated carbon is limited in the rapid adsorption and desorption due to the limited microporous portion that actually affects adsorption.

In contrast, activated carbon fibers with micropores directly formed on the surface have excellent adsorption and desorption speeds and can be applied to filters that remove harmful gases and fine dust, creating high added value by securing original technology for new fiber materials. It is in the spotlight as a possible field.

Currently, the market for activated carbon fibers is difficult to secure market competitiveness due to the high price of raw materials such as polyacrylonitrile, so the development of low-cost activated carbon fibers is required to expand the market.

In addition, even when trying to manufacture activated carbon fibers using inexpensive raw materials such as polyolefin, it is possible to improve the microporosity by forming micropores, but it was difficult to maintain mechanical strength through carbonization and activation.

Accordingly, it is necessary to establish a leading position in the manufacturing technology of activated carbon fibers manufactured from low-cost raw materials, and for this purpose, the development of low-cost raw material-based activated carbon fibers that can maintain mechanical strength while maintaining excellent microporosity is more urgently needed. .

An object of the present invention for solving the above problems is to provide a core-sheath type activated carbon composite fiber in which only the sheath layer is activated, and a method for manufacturing the same.

In addition, another object of the present invention is to provide a core-cis-type activated carbon composite fiber and a method for producing the same, which has an excellent specific surface area and a high microporosity and maintains excellent mechanical strength after activation.

In addition, another object of the present invention is to provide an adsorbent comprising a core-cis type activated carbon composite fiber excellent in adsorption and desorption against harmful gases and fine dust.

As a result of research in order to achieve the above object, the method for producing a core-cis-type activated carbon composite fiber according to the present invention includes a) preparing a core-cis-type polyolefin-based composite fiber, b) the core-cis-type polyolefin-based fiber Crosslinking the composite fibers, and c) carbonizing the crosslinked composite fibers, and activating the sheath layer.

The core-cis-type polyolefin-based composite fiber according to an embodiment of the present invention may include polyolefin-based resins different from each other in the core and the sheath.

The polyolefin resin according to an aspect of the present invention is any one or a mixture of two or more selected from linear low density polyethylene, low density polyethylene, ultra low density polyethylene, metallocene-linear low density polyethylene, high density polyethylene and polypropylene, or a copolymer thereof Can be.

The core of the core-cis-type polyolefin-based composite fiber according to an aspect of the present invention includes high-density polyethylene, and the sheath of the core-cis-type polyolefin-based composite fiber may include low-density polyethylene and inorganic particles.

The core of the core-cis-type polyolefin-based composite fiber according to an aspect of the present invention includes polypropylene, and the sheath of the core-cis-type polyolefin-based composite fiber may contain low-density polyethylene and inorganic particles.

Step b) according to an aspect of the present invention may be an electron beam or microwave treatment.

The step b) according to an aspect of the present invention may be additional treatment with a strong acid.

The activation in step c) according to an aspect of the present invention may be performed under an oxidizing gas or an inert gas, or may be impregnated with an activator and then heat treated.

Another aspect of the present invention is a core-cis-type activated carbon composite comprising a core layer comprising a carbonized first crosslinked polyolefin resin and a sheath layer comprising a second crosslinked polyolefin resin that is carbonized and activated by dispersing inorganic particles. It is a fiber.

The first crosslinked polyolefin resin and the second crosslinked polyolefin resin according to an aspect of the present invention may be derived from polyolefin resins different from each other.

The first cross-linked polyolefin-based resin according to an aspect of the present invention may be derived from high-density polyethylene, and the second cross-linked polyolefin-based resin may be derived from low-density polyethylene.

The first crosslinked polyolefin resin according to an aspect of the present invention may be derived from polypropylene, and the second crosslinked polyolefin resin may be derived from low density polyethylene.

The core-sheath-type activated carbon composite fiber according to an aspect of the present invention may have a microporosity of 90% or more, and a tensile strength of 500 MPa or more, measured according to ASTM D 3379.

Another aspect of the present invention is an adsorbent comprising the above-described core-cis type activated carbon composite fiber.

The activated carbon composite fiber according to the present invention has the advantage of having excellent microporosity as well as excellent mechanical strength.

In addition, the method for producing an activated carbon composite fiber according to the present invention has the advantage of having excellent mechanical strength by preventing a significant decrease in physical properties before activation even if activated.

In addition, the adsorbent comprising the activated carbon composite fiber according to the present invention has the advantage of implementing an excellent adsorption and desorption effect.

1 is a photograph of a fracture surface of an activated carbon composite fiber observed with a scanning electron microscope according to an embodiment of the present invention.

Hereinafter, a core-cis-type activated carbon composite fiber according to the present invention, a method of manufacturing the same, and an adsorbent including the same will be described in more detail through the following examples. However, the following examples are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

In addition, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms used in the description herein are merely for effectively describing specific embodiments, and are not intended to limit the invention.

The present invention will be described in detail as follows.

As a result of research in order to achieve the above object, the method for producing a core-cis-type activated carbon composite fiber according to the present invention includes a) preparing a core-cis-type polyolefin-based composite fiber, b) the core-cis-type polyolefin-based fiber Crosslinking the composite fibers, and c) carbonizing the crosslinked composite fibers, and activating the sheath layer.

The core-sheath-type activated carbon composite fiber manufactured by the manufacturing method according to the present invention has excellent microporosity and can maintain excellent mechanical strength even after carbonization and activation. As a result, durability is improved, so that it can be used for a long time even with repeated exposure to the external environment, and an excellent adsorption and desorption effect can be realized for harmful gases and fine dust.

The method for producing a core-cis-type activated carbon composite fiber according to the present invention essentially undergoes a crosslinking step. When a resin such as a polyester resin is used, when crosslinked with microwave, electron beam or strong acid, it is not crosslinked, but rather It was decomposed and it was difficult to form carbon fibers after carbonization. When using a polyolefin-based resin to overcome this, it is preferable to manufacture a core-cis-type activated carbon composite fiber from a polyolefin-based resin, since the above-described problems can be solved, and more excellent microporosity and mechanical strength can be realized. .

In addition, as a raw material of the core-sheath type activated carbon composite fiber, the productivity is also excellent at low cost and can be easily applied to various fields with respect to polyacrylonitrile resin.

The method for producing a core-sheath type activated carbon composite fiber according to the present invention will be described in detail as follows.

According to an aspect of the present invention, step a) is a step of preparing a core-cis-type polyolefin-based composite fiber. Specifically, the core-cis-type polyolefin-based composite fiber may include a polyolefin-based resin in the core and the sheath, respectively, and may be composite-spun. Preferably, the core and the sheath may contain different polyolefin resins.

According to one aspect of the present invention, the polyolefin-based resin is, for example, linear low density polyethylene (LLDPE), low density polyethylene (LDPE), very low density polyethylene (VLDPE). , Metallocene-linear low density polyethylene (m-LLDPE, metallocene-linear low density polyethylene), high density polyethylene (HDPE, high density polyethylene), polypropylene (PP, polypropylene), etc. It may be a copolymer.

The ultra-low density polyethylene (VLDPE) has a density of 0.850 to 0.910 g/cm 3.

The low-density polyethylene (LDPE) has a density of 0.911 to 0.925 g/cm 3.

The linear low density polyethylene (LLDPE) has a density of 0.911 to 0.935 g/cm 3.

The metallocene-linear low density polyethylene (m-LLDPE) has a density of 0.915 to 0.925 g/cm 3.

The high-density polyethylene (HDPE) has a density of 0.930 to 0.980 g/cm 3.

According to an aspect of the present invention, in the core-cis-type polyolefin-based composite fiber, the first polyolefin-based resin included in the core may have a higher density than the second polyolefin-based resin included in the sheath. Preferably, in one aspect, the core may include high-density polyethylene, and the sheath may include low-density polyethylene. In another aspect, the core may include polypropylene, and the sheath may include low-density polyethylene. More preferably, the sheath may include low-density polyethylene and inorganic particles.

According to an aspect of the present invention, the sheath may contain 80 to 99% by weight of the second polyolefin resin and 1 to 20% by weight of inorganic particles, and preferably 90 to 99% by weight of the second polyolefin resin and inorganic particles. It may contain 1 to 10% by weight. When included in the above amount, when activated carbon is formed in the sheath, microporosity can be remarkably improved.

According to an aspect of the present invention, the inorganic particles may be, for example, any one or a mixture of two or more selected from metal-based materials and carbon-based materials. For example, it may be any one or a mixture of two or more selected from titanium dioxide, zirconium dioxide, iron trioxide, tin oxide, carbon black, carbon nanotubes, graphene and graphite. By including the above inorganic particles together, the microporosity in the sheath can be further improved.

According to one aspect of the present invention, the sheath of the core-cis-type polyolefin-based composite fiber may be formed from a polyolefin-based composite containing inorganic particles. The polyolefin-based composite may be extruded by mixing a polyolefin-based resin and inorganic particles. For example, the conditions of the extrusion are not particularly limited, but may be performed under conditions such as, for example, a screw rotation speed of 100 to 1,000 rpm, an extrusion temperature of 200 to 300°C, and a kneading time of 10 seconds to 10 minutes. Preferably, it may be performed under conditions such as a screw rotation speed of 200 to 500 rpm, an extrusion temperature of 200 to 250° C., and a kneading time of 10 seconds to 5 minutes, but are not limited thereto.

According to an aspect of the present invention, the polyolefin-based composite may be dried at 60 to 100° C. for 1 to 40 hours, but is not limited thereto.

According to an aspect of the present invention, the composite spinning may be performed in a core-sheath composite spinning apparatus, and spinning at a spinning temperature of 180 to 300° C. at a spinning speed of 1 to 100 m/min. Preferably, it may be spun at a spinning temperature of 180 to 250° C. at a spinning speed of 10 to 50 m/min, but is not limited thereto.

According to an aspect of the present invention, the core-cis-type polyolefin-based composite fiber may be further subjected to a step of winding after composite spinning. The winding speed may be applied in the same manner as the spinning speed, but is not limited thereto.

Conventionally, when the polyolefin-based fiber passes through the carbonization and activation steps as described above, the microporosity is not high even if micropores are formed, and it is difficult to use due to remarkably low mechanical strength.

In contrast, the core-cis-type polyolefin-based composite fiber according to the present invention may have excellent microporosity when subjected to carbonization and activation steps, as well as excellent mechanical strength such that the mechanical strength of the polyolefin-based resin itself is maintained. As a result, it can be applied to various adsorption and desorption applications, as well as exhibit durability that can prevent deterioration of properties.

The step b) according to the present invention is a step of crosslinking the core-cis type polyolefin-based composite fiber. According to one aspect, the core-cis-type polyolefin-based composite fiber may have all or part of the fibers crosslinked, and preferably 50% or more of the fibers, more preferably 80% or more of the fibers may be crosslinked.

According to an aspect of the present invention, the crosslinking may be an electron beam or microwave treatment. By the electron beam or microwave treatment as described above, crosslinking of the polyolefin-based resin in the core-cis-type polyolefin-based composite fiber can be induced, and excellent mechanical strength can be realized even after undergoing carbonization and activation steps.

According to an aspect of the present invention, the electron beam may be treated with an irradiation amount of 100 to 2,000 kGy under an energy condition of 0.1 to 10 MeV, and preferably 500 to 2,000 kGy. When the electron beam is irradiated under the conditions in the above range, it is possible to induce a stable crosslinked structure to realize more excellent mechanical strength.

According to an aspect of the present invention, the microwave can be treated with an irradiation intensity of 100 to 2,000 W, preferably 500 to 2,000 W. In addition, the microwave may be irradiated for 1 to 60 minutes. Specifically, it can be irradiated for 1 to 10 minutes. When microwaves are irradiated under the conditions in the above range, a stable crosslinked structure can be induced, thereby realizing more excellent mechanical strength.

Preferably, after the electron beam or microwave treatment as described above, it may be further treated with a strong acid. The strong acid may be any one or a mixture of two or more selected from sulfuric acid, nitric acid, hydrochloric acid and hydrofluoric acid, and preferably sulfuric acid. In addition, the strong acid treatment may be performed at a temperature of 100 to 200°C. When the strong acid is additionally treated as described above, it is possible to achieve remarkably superior mechanical strength of twice or more compared to when only electron beam or microwave treatment is performed.

The step c) according to the present invention is a step of carbonizing the crosslinked core-cis-type polyolefin-based composite fiber and activating the sheath layer.

Specifically, according to an aspect of the present invention, the carbonization may be carbonized at 800 to 3,000°C in an inert gas atmosphere. Specifically, the temperature is raised to 5°C per minute from room temperature to 800 to 3,000°C in an inert gas atmosphere for 30 minutes. Carbonization can be carried out for 90 minutes. Preferably, carbonization may be carried out for 30 minutes to 90 minutes by raising the temperature to 5°C per minute from room temperature to 800 to 1,000°C in an inert gas atmosphere. By carbonization as described above, high density and high carbonization can be achieved, thereby further improving mechanical strength.

According to an aspect of the present invention, the activation may be performed by any one or two or more methods selected from physical activation and chemical activation. Specifically, the physical activation may be performed under an oxidizing gas or an inert gas. For example, it may be activated by injecting any one or two or more gases selected from water vapor, carbon dioxide, and nitrogen.

Specifically, the chemical activation may be heat treatment after impregnation with an activator. For example, the activating agent may be potassium hydroxide (KOH), and when the activating agent is impregnated with fibers and then heat-treated in an inert gas atmosphere, micropores are formed, thereby implementing an effective adsorption and desorption effect.

According to an aspect of the present invention, the activator may contain 100 to 500 parts by weight, preferably 200 to 500 parts by weight, based on 100 parts by weight of the impregnated fiber. When included in the above amount, formation of macropores may be suppressed, and micropores may be formed to have adsorption and desorption effects for various substances.

According to an aspect of the present invention, the activation may be performed at a temperature of 500 to 1,000° C. for 1 to 5 hours, but is not limited thereto.

Therefore, by performing activation as described above, micropores among the micropores in the core-cis-type activated carbon composite fiber can be more developed, so that the microporosity is excellent, and accordingly, the specific surface area can be further increased. Can be implemented.

Another aspect of the present invention is a core-cis-type activated carbon composite comprising a core layer comprising a carbonized first crosslinked polyolefin resin and a sheath layer comprising a second crosslinked polyolefin resin that is carbonized and activated by dispersing inorganic particles. It is a fiber.

The core-sheath-type activated carbon composite fiber according to the present invention not only has excellent microporosity, but can maintain excellent mechanical strength even after carbonization and activation. As a result, durability is improved, so that it can be used for a long time even with repeated exposure to the external environment, and excellent adsorption and desorption effects can be realized against odors, harmful gases and fine dust.

According to an aspect of the present invention, the carbonized first crosslinked polyolefin resin of the core layer may be formed by carbonizing a core layer containing a first crosslinked polyolefin resin obtained by crosslinking the first polyolefin resin. The second crosslinked polyolefin resin in which the inorganic particles of the sheath layer are dispersed and carbonized and activated is formed by crosslinking the second crosslinked polyolefin resin and the dispersed inorganic particles are present in the continuous second polyolefin resin. It may be formed by carbonizing and activating the sheath layer.

By having the configuration in which only the sheath layer is activated as described above, it is possible to provide a structure in which micropores are developed on the surface advantageous for adsorption and desorption, as well as to realize high mechanical strength, so that it can be applied to various fields requiring durability. .

According to an aspect of the present invention, the first crosslinked polyolefin resin and the second crosslinked polyolefin resin may be derived from polyolefin resins different from each other. Preferably, the first polyolefin-based resin forming the core layer may have a higher density than the second polyolefin-based resin forming the sheath layer. Preferably, in one aspect, the first crosslinked polyolefin resin may be derived from high density polyethylene, and the second crosslinked polyolefin resin may be derived from low density polyethylene. In another aspect, the first crosslinked polyolefin resin may be derived from polypropylene, and the second crosslinked polyolefin resin may be derived from low density polyethylene.

According to an aspect of the present invention, the sheath layer of the core-cis-type activated carbon composite fiber may have an activation degree of all or part of the sheath layer, preferably 50% or more, more preferably 80% or more of the fiber. It may be, but is not limited thereto.

According to an aspect of the present invention, the sheath layer of the core-cis type activated carbon composite fiber may have a microporosity of 85% or more, preferably a microporosity of 90% or more, and more preferably a microporosity of 93 It can be more than %. The upper limit is not particularly limited, but may be preferably 99.9%.

According to an aspect of the present invention, the core-cis-type activated carbon composite fiber may have a specific surface area of 1,200 m 2 /g or more, preferably 1,500 m 2 /g or more. The upper limit is not particularly limited, but may be preferably 3,000 m 2 /g.

As described above, the microporosity is excellent, so it is excellent for removing harmful gases and fine dust.

In addition, even though the existing activated carbon fiber has excellent microporosity, the mechanical strength is significantly reduced and the durability is not good, but the core-sheath type activated carbon composite fiber according to the present invention has a tensile strength measured according to ASTM D 3379 of 500 MPa or more. I can. Preferably, the tensile strength may be 800 MPa or more, more preferably the tensile strength may be 1,000 MPa or more, and most preferably, the tensile strength may be 1,500 MPa or more.

According to an aspect of the present invention, the core-sheath-type activated carbon composite fiber may maintain a tensile strength of at least 60% as compared to a case where the tensile strength measured immediately after carbonization is 100%. It is preferably 65% or more, more preferably 70% or more can be maintained.

By having excellent tensile strength as described above, it can have stable durability even when exposed to the external environment for a long time. In addition, it is better in terms of marketability because it can achieve a similar level of mechanical strength compared to activated carbon fibers manufactured from expensive raw materials capable of implementing high strength, thereby significantly reducing productivity and cost.

Another aspect of the present invention is an adsorbent comprising the above-described core-cis type activated carbon composite fiber.

The core-sheath type activated carbon composite fiber, which has a high microporosity and can realize an excellent level of mechanical strength, has an excellent adsorption and desorption effect. Thereby, it can be used as an adsorbent for various substances.

According to an aspect of the present invention, the adsorbent may be used for removing odors, harmful gases and fine dust. Specifically, it may be used for removing one or two or more selected from odors, toxic gases, strong acid gases, volatile organic compounds, dust, and fine dust, but is not limited thereto.

Therefore, the core-sheath-type activated carbon composite fiber according to the present invention can simultaneously utilize excellent microporosity and tensile strength, and can be applied to various uses.

Hereinafter, the present invention will be described in detail with reference to examples. However, these are for describing the present invention in more detail, and the scope of the present invention is not limited by the following examples.

In addition, the unit of the additive not specifically described in the specification may be a weight %.

[Method of measuring properties]

(1) Tensile strength

Tensile strength was carried out according to ASTM D 3379 standard, using Instron 4467, a 50N load cell, a cross-head speed of 0.2mm/min, and a clamp made by a constant-speed tensile test method were fixed. And the other clamps moved at a constant speed throughout the test and were measured without deflection in the vertical direction. Tensile strength applied to the test piece was measured by stretching the fiber under specified conditions until fracture.

(2) Microporosity and specific surface area

77K/nitrogen adsorption test was conducted using the US MICROMERITICS TRISTAR II3020 equipment. The specific surface area was derived using the Brunauer-Emmett-Teller (BET) equation. The total pore volume was obtained using the adsorption curve up to 0.990 of the relative pressure, and the micropore volume was also derived using the Dubinin Radushkevich (D-R) equation.

[Example 1]

Extruded for 60 seconds using an extruder at a mixing ratio of 95% by weight of low-density polyethylene (Lotte Chemical, XJ700) and 5% by weight of titanium dioxide (TiO ₂ , HKC Korea Chemical, White Masterbatch) using an extruder at 230℃ and a screw rotation speed of 300rpm. I did. It was manufactured in the form of a monofilament having a diameter of 500 μm through a die. The prepared monofilament was made into chips through pelletization. The chips were dried in an oven at 80° C. for 14 hours.

The chip was put into the sheath layer, and high-density polyethylene (Lotte Chemical, 2600F) was introduced into the composite spinning apparatus at a weight ratio of 5:5 to the core layer, and the spinning temperature was 200 ℃, the spinning sphere 36 holes, the spinning speed 30m/min, and the discharge amount 24g. Combined spinning was performed at /min. After spinning, it was solidified in the air to form a solid phase and wound at the same speed as the spinning speed to prepare a core-sheath type polyolefin-based composite fiber.

The core-cis-type polyolefin-based composite fiber was irradiated with an electron beam crosslinking irradiation device (IBTech) at an irradiation dose of 2,000 kGy (2.5 MeV) to prepare a crosslinked composite fiber.

The crosslinked composite fibers were heated to 1000° C. at 5° C./min in a nitrogen atmosphere and carbonized by holding for 1 hour. Thereafter, 200 ml/min of carbon dioxide was injected into the activation furnace at 900° C. for 1 hour. After that, nitrogen gas was added at a rate of 150 ml/min and cooled to room temperature. As a result, a core-cis-type activated carbon composite fiber in which only the sheath was activated was prepared.

[Example 2]

Except for using carbon black (HKC Korea Chemical, black masterbatch) in place of titanium dioxide in Example 1, the same was carried out.

[Example 3]

In Example 1, the same was carried out except that polypropylene (Lotte Chemical, FR-160) was used instead of high-density polyethylene for the core layer.

[Example 4]

In Example 1, instead of crosslinking by treating with an electron beam, the same was carried out except for crosslinking by irradiating microwaves for 5 minutes at an intensity of 1,000W.

[Example 5]

In Example 1, it was carried out in the same manner, except that after crosslinking with an electron beam, sulfuric acid treatment was performed as follows.

After the composite fiber crosslinked with an electron beam was supported in concentrated sulfuric acid (96%), it was charged into a silicone oil bath. The bath was heated to 140° C. at a rate of 5° C./min and then heat treated for 150 minutes. At this time, the evaporated sulfuric acid was recovered by liquefying again through an aspirator, and the composite fiber after the reaction was washed with distilled water to neutralize it, and then dried in an oven at a temperature of 60° C. for 24 hours.

[Example 6]

It was carried out in the same manner as in Example 5, except that after crosslinking with microwaves in Example 4 was subjected to sulfuric acid treatment as in Example 5.

[Example 7]

In Example 1, it was carried out in the same manner, except that chemical activation was performed as follows instead of physical activation.

Potassium hydroxide solution (KOH) and crosslinked composite fibers were processed at a weight ratio of 4:1, and the crosslinked composite fibers were immersed in 1M potassium hydroxide solution and treated at 500°C for 3 hours. The activated fiber was washed with distilled water and dried at 105° C. to prepare a core-cis-type activated carbon composite fiber in which only the sheath was activated.

[Example 8]

In Example 1, the same was carried out, except that the mixing ratio of 99% by weight of low-density polyethylene and 1% by weight of titanium dioxide was used.

[Example 9]

In Example 1, it was carried out in the same manner, except that the mixing ratio of 90% by weight of low-density polyethylene and 10% by weight of titanium dioxide was used.

[Example 10]

In Example 1, it was carried out in the same manner, except that the mixing ratio of 85% by weight of low-density polyethylene and 15% by weight of titanium dioxide was used.

[Example 11]

The same was carried out in Example 1, except that the mixing ratio of 99.9% by weight of low-density polyethylene and 0.1% by weight of titanium dioxide was used.

[Example 12]

In Example 1, the electron beam treatment was not performed, except that the sulfuric acid treatment performed in Example 5 was performed in the same manner.

[Comparative Example 1]

In Example 1, the same was carried out except that 100% by weight of low-density polyethylene (Lotte Chemical, XJ700) was formed on the sheath layer.

[Comparative Example 2]

In Example 1, it was carried out in the same manner, except that a single fiber was produced by spinning alone as a chip without performing the composite spinning.

[Comparative Example 3]

Commercially available activated carbon fiber (Carboflex ACF) was used.

Tensile strength immediately after carbonization
(MPa) Tensile strength after activation
(MPa) Microporosity
(%) Specific surface area
(㎡/g) Example 1 1,576 763 91.1 1,524 Example 2 1,672 772 91.3 1,511 Example 3 1,612 774 90.8 1,507 Example 4 1,467 721 92.4 1,519 Example 5 2,491 2,011 94.1 1,623 Example 6 2,454 1,975 94.5 1,602 Example 7 1,532 758 91.5 1,344 Example 8 1,402 711 90.1 1,512 Example 9 1,599 772 90.4 1,522 Example 10 1,457 710 87.8 1,494 Example 11 1,499 630 87.9 1,241 Example 12 2,473 1,893 88.2 1,488 Comparative Example 1 1,523 797 85.0 1,211 Comparative Example 2 2,160 12.2 90.3 1,522 Comparative Example 3 - 25.7 92.2 1,206

As shown in Table 1 above, the core-cis-type activated carbon composite fiber according to the present invention not only has a higher specific surface area and microporosity than the previously sold activated carbon fibers as in Comparative Example 3, but also maintains high mechanical strength even after activation. It was confirmed that it is excellent for application to various fields requiring durability and adsorption and desorption at the same time.

In addition, as in Examples 5 and 6, it was confirmed that more excellent specific surface area, microporosity, and tensile strength can be realized when additional treatment with sulfuric acid after electron beam or microwave irradiation is performed.

Preferably, when the content of inorganic particles in the sheath layer is 1 to 10% by weight, it was confirmed that more excellent specific surface area, microporosity, and tensile strength can be realized.

In addition, as in Comparative Example 1, when the sheath layer was prepared without including inorganic particles, the tensile strength was high, while the specific surface area and microporosity were significantly lower, and the adsorption effect was low. As in Comparative Example 2, in the case of short fibers other than the core-sheath type, excellent specific surface area and microporosity were realized, but it was confirmed that the tensile strength was significantly reduced.

Therefore, the core-sheath type activated carbon composite fiber according to the present invention can simultaneously secure a specific surface area, microporosity, and tensile strength, and thus can be applied to various fields.

The present invention described above is merely exemplary, and those of ordinary skill in the art to which the present invention pertains will appreciate that various modifications and other equivalent embodiments are possible. Therefore, it will be appreciated that the present invention is not limited to the form mentioned in the detailed description above. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Therefore, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things that are equivalent or equivalent to the claims as well as the claims to be described later fall within the scope of the spirit of the present invention. .

Claims (14)

a) preparing a core-cis-type polyolefin-based composite fiber;
b) first crosslinking the core-cis-type polyolefin-based composite fiber with an electron beam or microwave;
c) secondary crosslinking of the primary crosslinked core-cis-type polyolefin-based composite fiber with a strong acid; And
d) carbonizing the crosslinked composite fibers and activating the sheath layer;
Including,
The sheath layer of the core-cis type polyolefin-based composite fiber includes a polyolefin-based resin and inorganic particles,
The activation in step d) is performed under an oxidizing gas or an inert gas, or impregnated with an activating agent and then heat-treated. The method of claim 1,
The core-cis-type polyolefin-based composite fiber is a method for producing a core-cis-type activated carbon composite fiber comprising different polyolefin-based resins in the core and the sheath. The method of claim 2,
The polyolefin resin is a core-cis-type activated carbon composite selected from linear low-density polyethylene, low-density polyethylene, ultra-low-density polyethylene, metallocene-linear low-density polyethylene, high-density polyethylene, and polypropylene, or a copolymer thereof. Method of manufacturing fiber. delete delete delete delete delete It consists of a core layer containing a carbonized first crosslinked polyolefin resin and a sheath layer containing a second crosslinked polyolefin resin that is carbonized and activated by dispersing inorganic particles,
The first crosslinked polyolefin resin and the second crosslinked polyolefin resin are derived from polyolefin resins different from each other, and the core-cis type activated carbon composite fiber has a microporosity of 90% or more, and is measured according to ASTM D 3379. Core-sheath type activated carbon composite fiber with tensile strength of 1,500 MPa or more. delete The method of claim 9,
The first crosslinked polyolefin resin is derived from high-density polyethylene,
The second crosslinked polyolefin-based resin is a core-sheath type activated carbon composite fiber derived from low-density polyethylene. The method of claim 9,
The first crosslinked polyolefin resin is derived from polypropylene,
The second crosslinked polyolefin-based resin is a core-sheath type activated carbon composite fiber derived from low-density polyethylene. delete The adsorbent comprising the core-cis type activated carbon composite fiber of any one of claims 9, 11 and 12.

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