JP2016117972A - Water-repellent fibrous active carbon multi-ply woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-repellent fibrous active carbon multi-ply woven fabric which has high tensile strength and abrasion resistance, is excellent in plasticity, handleability, and workability such as laminating processing, and has high adsorptivity for an organic solvent gas per unit area when being wet by water or sweat.SOLUTION: The fibrous active carbon multi-ply woven fabric has a volume density which exceeds 0.19 g/cmand is 0.5 g/cmor less and a dry weight of 60-250 g/mand shows water repellency of class 2 or higher in a water repellent test (spray test) under JIS L-1092(2009)7.2.SELECTED DRAWING: None

Description

  The present invention relates to a fibrous activated carbon woven fabric obtained by carbonizing and activating a woven fabric of carbonized raw organic fibers, and relates to a fibrous activated carbon woven fabric having water repellency.

  Conventionally, it has been proposed to obtain a fibrous activated carbon by subjecting a raw material organic fiber that can be carbonized to carbonization treatment and activation treatment. Patent Document 1 proposes a knitted fabric fibrous activated carbon knitted fabric. According to this, a fibrous activated carbon knitted fabric that is flexible, excellent in workability, high in tensile strength, and good in handleability can be obtained. However, it has not been possible to satisfy high demands such as higher performance as a recent activated carbon fabric and higher workability in combination with other materials.

  In particular, the balance between the adsorption performance and the durability such as strength and wear resistance is not sufficient. That is, if the specific surface area of the fibrous activated carbon knitted fabric is increased in order to increase the adsorption performance for organic solvent gas per unit area, the adsorption / desorption speed of the gas is fast and very large adsorption due to the highly developed pore structure of the micropores. While it became possible to have performance, the knitted fabric, that is, the tensile strength and wear resistance of the loop portion were lowered.

  In addition, when assuming continuous industrial production, it was considered that if the strength of the fibrous activated carbon knitted fabric is insufficient because the tension is applied by shrinkage in the course direction during firing, it may be torn or cut. . Furthermore, it is difficult to obtain a fibrous activated carbon knitted fabric with curled ends at both ends, a shrinkage in the width direction that is unstable, a constant and stable width, a large variation in shrinkage, a large variation in dry basis weight, The stitch was bent and the quality of the product was inferior.

  Furthermore, these fibrous activated carbons are used in various applications due to the high adsorption and desorption speed of the gas due to the micropore structure originally developed by the micropores, and very large adsorption performance. When it gets wet with water, seawater, sweat, etc., it may not be able to fully demonstrate its practical performance when used as a filter or protective clothing.

JP 58-213615 A

  The present invention is intended to solve the problems of the prior art, and has high tensile strength and wear resistance, excellent flexibility, good handleability, good processability such as laminating, and wet with water and sweat. Even in such a case, the present invention intends to provide a fibrous activated carbon multi-woven fabric having water repellency having a large adsorption performance for organic solvent gas per unit area.

As a result of intensive studies to solve the above problems, the present inventors have reached the present invention. That is, the present invention is as follows.
(1) Bulk density exceeds 0.19 g / cm ³ and is 0.5 g / cm ³ or less, dry basis weight is 60 to 250 g / m ² , 7.2 water repellency test of JIS L1092 (2009) ( A fibrous activated carbon multi-woven fabric characterized by having a water repellency of 2nd grade or higher according to a spray test).
(2) The fibrous activated carbon multiple fabric according to (1), which has a tensile strength of 10 N / 5 cm or more.
(3) A protective garment using the fibrous activated carbon multiple fabric according to (1) or (2).
(4) The method for producing a fibrous activated carbon multiple woven fabric according to (1) or (2), wherein a multiple woven fabric comprising yarns of precursor fibers of fibrous activated carbon is carbonized and activated in a batch or continuous manner.

  The present invention is a fibrous activated carbon woven fabric obtained by carbonizing and activating carbonized raw material multiple woven fabric, which has high tensile strength, high wear resistance, excellent flexibility, and handleability In particular, the present invention relates to a fibrous activated carbon multi-woven fabric that is excellent in workability such as laminating and has excellent organic gas adsorption performance per unit area even when wet with water or sweat. Specifically, the present invention relates to medical supplies such as masks, deodorizing pads, and deodorizing sheets, protective clothing that protects the body from harmful gases, various air purifiers, various adsorbing elements used in the liquid phase, and electric reaction fields such as various batteries. It is related with the fibrous activated carbon multiple fabric used for the electrode of this, the electrode for electric tanks, etc. In particular, the present invention relates to a fibrous activated carbon multiple woven fabric that is less damaging such as tearing and wear and has water repellency when the fibrous activated carbon multiple woven fabric is processed by combining it with a sheet material or a molded product by lamination or sticking.

It is the schematic which showed the gas-penetration resistance test method.

  The fibrous activated carbon multiple woven fabric of the present invention has an effect of excellent balance of water repellency, tensile strength, wear resistance, flexibility, adsorption performance, etc. by applying a woven structure to the multiple woven fabric and further water repellent treatment. Have For the process of obtaining a fibrous activated carbon woven fabric having a multi-woven woven structure (hereinafter sometimes referred to as “fibrous activated carbon multiple woven fabric”), the fibrous polymer precursor yarns are pre-multi-woven, and then carbonized / A method of activation to make a fibrous activated carbon multi-woven fabric is preferred. This is because it is extremely difficult to industrially manufacture the fibrous activated carbon multi-woven fabric by weaving the activated carbon fiber yarn because the strength of the activated carbon fiber yarn is weak.

  In order to obtain a flexible fibrous activated carbon sheet, a knitted fabric-like fibrous activated carbon sheet was preferred. However, a knitted fabric-like sheet has low tensile strength and is relatively free from tearing and abrasion. Likely to happen. On the other hand, a woven fibrous activated carbon sheet has high tensile strength but is inferior in flexibility.

  Therefore, in the present invention, the fibrous activated carbon sheet has a multi-woven structure and is further subjected to water repellency treatment so that the fibrous activated carbon having a good balance of water repellency, tensile strength, abrasion resistance, flexibility, adsorption performance, etc. A multi-woven fabric is obtained.

The bulk density of fibrous activated carbon multiple fabric of the present invention is 0.5 g / cm ³ or less exceed 0.19 g / cm ^3, preferably 0.20 g / cm ³ or more 0.45 g / cm ³ or less, more preferably Is from 0.20 g / cm ^{3 to} 0.40 g / cm ³ . When the bulk density is 0.19 g / cm ³ or less, the thickness of the multi-woven fabric increases, and depending on the application, product design may be hindered. When the bulk density exceeds 0.5 g / cm ³ , the flexibility becomes low.

Drying basis weight of the fibrous activated carbon multiple fabric of the present invention is a ^{60~250g / m 2, 80~250g / m} 2 is preferred. If the dry basis weight is less than 60 g / m ² , the adsorption performance is low and the protective property cannot be obtained, and it is not preferable, and if it exceeds 250 g / m ² , the physiological burden increases when used in protective clothing.

  The tensile strength of the fibrous activated carbon multiple fabric of the present invention is preferably 10 N / 5 cm or more. When the tensile strength is less than 10 N / 5 cm, for example, when it is industrially laminated with other fiber aggregates such as woven or knitted fabrics and nonwoven fabrics, tearing occurs due to mechanical stress applied to the fibrous activated carbon multi-woven fabric, and the productivity is greatly increased. Reduced and impractical. The upper limit of the tensile strength is not particularly limited, but is about 100 N / 5 cm.

  As precursor fibers of fibrous activated carbon, phenolic fibers, cellulose fibers, pitch fibers and PAN fibers are known, but in order to obtain a fibrous activated carbon multi-woven fabric with high tensile strength according to the present invention, fibrous fibers It is preferable that the precursor fiber of activated carbon is a phenol fiber.

The air permeability of the fibrous activated carbon multiple fabric of the present invention is preferably 50 cm ³ / cm ² · s or more, more preferably 100 cm ³ / cm ² · s or more. When the air permeability is less than 50 cm ³ / cm ² · s, an increase in pressure loss occurs when used in a filter, and a problem such as a decrease in wearing feeling occurs when used in protective clothing. The upper limit of the air permeability is not particularly limited, but is preferably 1000 cm ³ / cm ² · s or less. This is because multiple woven fabrics exceeding 1000 cm ³ / cm ² · s cannot be woven.

The adsorption performance of the fibrous activated carbon multiple fabric of the present invention is preferably 30 to 200 g / m ² in terms of the adsorption performance of toluene described in Section 7.8 of JIS K1477 (2007) “Fibrous activated carbon test method”. / M ² is more preferable. When the toluene adsorption performance is less than 30 g / m ² , practical performance cannot be sufficiently exhibited when used as a filter or protective clothing. On the other hand, if clothing such as protective clothing is molded from a multi-woven fabric having a toluene adsorption performance exceeding 200 g / m ² , the weight of the garment increases when worn.

  Examples of the method for obtaining the fibrous activated carbon multiple fabric of the present invention include the following methods. As the precursor fiber of the fibrous activated carbon, phenol fiber is used, and the yarn of the precursor fiber may be either a spun yarn obtained from staple or a filament yarn, or a mixed yarn obtained by mixing the two. It doesn't matter. The single fiber fineness of the precursor fiber is preferably 1.1 dtex to 5.5 dtex, and the fineness of the precursor fiber yarn is preferably 197 to 885 dtex, more preferably 295 to 885 dtex. If the fineness of the yarn is less than 197 dtex, the strength of the yarn of the fibrous activated carbon after weaving, carbonizing and activating becomes low, and further, the flexibility is insufficient, which causes tearing and tearing during post-processing and use Connected.

  When weaving the raw material woven fabric using the yarn, in order to maintain the flexibility of the sheet after being converted to fibrous activated carbon, and further to maintain the adsorption performance, it is necessary to use a multi-weave as the woven structure. . When the woven structure is not a multi-woven structure but a plain woven fabric is superposed, the superposed surfaces are rubbed and the activated carbon powder falls off and a hole is opened, which is not practical. As an abrasion evaluation method, visual determination was made according to the JIS L1096 (2010) 8.19.4 D method (accelerator rotor method). In addition, fabrics that are laminated with plain woven fabric and laminated with a non-woven hot melt adhesive have a poorly flexible fiber activated carbon sheet because of the adhesive processing. It gets worse. The flexibility is preferably 10 mN · cm or less according to the JIS L1096 (2010) 8.21.2 B method (slide method).

In order to convert the obtained multi-woven fabric composed of precursor fibers into activated carbon, it is obtained by performing a carbonization / activation process in a batch or continuous manner. In consideration of obtaining uniformity in the fabric characteristics and adsorption performance of the obtained fibrous activated carbon multi-woven fabric and considering industrial productivity, it is preferable to perform carbonization and activation continuously. An active atmosphere containing water vapor, oxygen, carbon dioxide, etc., which is carbonized in an inert atmosphere at a temperature of 350 ° C. to 1000 ° C. and then reacts with carbon at a temperature of 500 ° C. to 1000 ° C. Activated and activated carbonized. In some cases, carbonization and activation can be performed simultaneously by controlling the atmospheric conditions. In addition, when the maximum reached temperature at the time of activation treatment, that is, activated carbonization, exceeds 1000 ° C., wrinkles may occur due to abnormal shrinkage, and the maximum reached temperature is preferably 1000 ° C. or lower. As a result, a fibrous activated carbon multiple fabric having a BET specific surface area of less than 1000 to 2000 m ² / g is obtained.

  The fibrous activated carbon multi-woven fabric of the present invention has a very high adsorption performance due to its high gas adsorption speed due to the micropore structure developed by the micropores inherently. However, when used as a filter or protective clothing, even if the fibrous activated carbon multiple fabric of the present invention gets wet by moisture condensation or sweat in the air, water repellency can be imparted to maintain high gas barrier properties. preferable. In order to maintain the performance even in the wet state when wet with water, sweat, etc., the water repellent degree according to JIS L1092 (2009) 7.2 water repellent degree test (spray method) It is preferable to have quaternary or higher. As a method of imparting water repellency, there are a method of spraying a water repellant by a spray method, a method of impregnating, and the like, and it is not particularly limited. The water repellent is not particularly limited, such as fluororesin, wax, cellulose reaction system, silicone resin, etc., and the amount of the water repellent is preferably 0.1 to 15 wt%, more preferably as the water repellent solid content. Is 0.5 to 5 wt%. This is because the degree of water repellency is low when the adhering amount is less than 0.1 wt%, and the adsorption performance decreases when it exceeds 15 wt%.

  Oil repellency may be imparted to the fibrous activated carbon multiple fabric of the present invention. The oil repellency in that case is preferably a grade 2 or higher, more preferably a grade 3 or higher, by the method according to AATCC Test Method 118-2002. This is because when it is lower than the second grade, the liquid organic chemical penetrates and the adsorption performance is lowered.

  The fibrous activated carbon multi-woven fabric of the present invention may be used in a single layer, but in order to reinforce and protect the fibrous activated carbon multi-woven fabric, a protective layer is laminated on both sides, and further an outer layer is laminated to adsorb. It can also be used for protective clothing as a sheet. The use method is effective in that it is rich in flexibility, which is a feature of the fibrous activated carbon fabric of the present invention, has high tensile strength and good handling properties, is excellent in processability such as lamination processing, and is excellent in organic gas adsorption performance. It can be said that this is a preferred embodiment.

  Hereinafter, the present invention will be described in detail based on examples. However, the following examples do not limit the present invention, and all modifications made without departing from the gist of the preceding and following descriptions are all included in the technical scope of the present invention. In addition, the measurement and evaluation of the characteristic value in this invention were performed as follows.

(Fineness)
The fineness was determined in accordance with the method described in JIS L1015 (2010) 8.5.1 (positive fineness) b) Method B (simple method). The notation is in dtex (decitex) units.

(Weight)
The basis weight was measured in accordance with the method described in JIS L1096 (2010) 8.3.2 (mass per unit area in the standard state).

(Dry basis weight)
The dry basis weight was measured under conditions based on the method described in JIS L0105 (2006) 5.3.2 (absolutely dried sample or test piece).

(thickness)
The thickness was measured according to the method described in 8.4 (thickness) a) A method (JIS method) of JIS L1096 (2010). However, the pressure was 0.7 kPa.

(The bulk density)
The bulk density was calculated in accordance with the method described in 8.11 (apparent specific gravity and pore volume ratio) a) apparent specific gravity of JIS L1096 (2010). However, the bulk density of the fibrous activated carbon fabric was calculated using a dry basis weight.

(Tensile strength)
The tensile strength was measured according to the method described in 8.14.1 (JIS method) of JIS L1096 (2010).
In the case of woven fabric, the warp direction refers to the warp direction, and the weft direction refers to the weft direction. In the case of a knitted fabric, it refers to the wale direction and the course direction.

(Air permeability)
The air permeability was measured according to the method described in 8.26.1 A method (fragile type method) of JIS L1096 (2010).

(Flexibility)
The bending resistance was measured according to the method described in 8.21.2 B method (slide method) of JIS L1096 (2010).

(Toluene adsorption performance)
The toluene adsorption performance was measured in accordance with the method described in 7.8.2 (equilibrium adsorption amount) of JIS K1477 (2007).

(BET specific surface area)
The BET specific surface area was calculated by a calculation based on the one-point method of 7.1.4b) by measuring the nitrogen adsorption amount based on the method described in 7.1 of JIS K1477 (2007).

(Abrasion (dust removal))
Evaluation was performed in accordance with the method described in JIS L1096 (2010) 8.19.4 D method (accelerator type method). However, Cw-C-P1200 was used as the abrasive paper, and the appearance of the sample was visually determined when the rotating blade was rotated at a rotation speed of 1000 times / minute for 2 minutes (O: no significant change in appearance before and after abrasion, (Triangle | delta): Damage is seen, X: Damage is large and many perforations are seen).

(Water repellency)
The water repellency was measured according to the method described in 7.2 of the water repellency test (spray test) of L1092 (2009).

(Hatsu oil level)
The oil repellency was measured according to the method described in AATCC Test Method 118-2002.

(Gas penetration resistance)
An explanatory view of the gas permeation resistance test is shown in FIG. A sheet material in which the outer layer material 4 is stacked on the upper surface of the fibrous activated carbon fabric 3 is sandwiched between two glass cells (upper cell 1 and lower cell 2) having an internal volume of 150 cc, and the periphery is sealed with paraffin 5. As the outer layer material, a cotton fabric having a breathability of 16 cm ³ / cm ² · s, a mass of 125 g / m ² , a thickness of 0.3 mm, and a water repellency of 5th grade was applied. From the upper cell 1 of this test container, 10 μL of 3-methoxybutyl acetate as the test solution 6 is dropped on the outer layer material. This is put in a constant temperature box set at 25 ° C. ± 2 ° C., and the gas concentration on the lower cell 2 side is sampled with a syringe every predetermined time (after 1, 30, 60, 120, 180, 240 minutes), and gas chromatography is performed. The gas concentration permeated through the sheet material was measured by graphy (◯: penetrating concentration <1 ppm, Δ: penetrating concentration≈1 ppm, x: penetrating concentration> 1 ppm).

<Example 1>
Using Kinoor spun yarn (product number KY-01, count 20 / 2Ne) manufactured by Gunei Chemical Industry Co., Ltd. having a single fiber fineness of 2.2 dtex and a yarn fineness of 590 dtex, a driving density of 28, 27, 28/2. A triple woven fabric of 54 cm, weft 27, 27, 27 / 2.54 cm was woven. This fabric has a basis weight of 410 g / m ² , a thickness of 1.25 mm, a bulk density of 0.33 g / cm ³ , a breathability of 123 cm ³ / cm ² · s, and a tensile strength of 778 N / 5 cm in the vertical direction and 768 N in the transverse direction. / 5cm.
The woven fabric was carbonized from normal temperature to 890 ° C. for 30 minutes in an inert atmosphere, and then activated for 90 minutes at a temperature of 890 ° C. in an atmosphere containing 12 wt% of water vapor. The obtained fibrous activated carbon triple woven fabric has a dry basis weight of 246 g / m ² , a thickness of 1.20 mm, a bulk density of 0.21 g / cm ³ , and a breathability of 126 cm ³ / cm ² · s, and the tensile strength is vertical. It was 62 N / 5 cm and the weft direction was 56 N / 5 cm. The toluene adsorption performance is 111 g / m ^2, BET specific surface area of those having a 1293m ² / g and a high adsorption performance, bending resistance was as flexible and 9.1mN · cm. Furthermore, the wearability (dust removal property) was also good.
This fibrous activated carbon triple woven fabric is pad-dried in a processing bath containing 3 wt% fluorine-based water repellent (Nuva N2114 manufactured by Clariant Co., Ltd.), and then subjected to fixing treatment at 170 ° C., and 1 wt. %. When this material was immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 0%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, it was found that the downstream side permeation concentration was <1 ppm and the gas permeation resistance was high.

<Example 2>
Using a kinoor spun yarn (product number KY-04, count 20/1 Ne) manufactured by Gunei Chemical Industry Co., Ltd. having a single fiber fineness of 2.2 dtex and a yarn fineness of 295 dtex, a driving density of 50, 46, 50/2. A triple woven fabric of 54 cm, weft 48, 44, 48 / 2.54 cm was woven. This fabric has a basis weight of 360 g / m ² , a thickness of 0.76 mm, a bulk density of 0.47 g / cm ³ , a breathability of 141 cm ³ / cm ² · s, and a tensile strength of 523 N / 5 cm in the vertical direction and 501 N in the transverse direction. / 5cm.
The woven fabric was carbonized from normal temperature to 890 ° C. for 30 minutes in an inert atmosphere, and then activated for 90 minutes at a temperature of 890 ° C. in an atmosphere containing 12 wt% of water vapor. The obtained fibrous activated carbon triple woven fabric has a dry basis weight of 216 g / m ² , a thickness of 0.72 mm, a bulk density of 0.30 g / cm ³ , and a breathability of 105 cm ³ / cm ² · s, and the tensile strength is vertical. It was 41 N / 5 cm and the width was 37 N / 5 cm. Further, the toluene adsorption performance was 102 g / m ² , the BET specific surface area was 1350 m ² / g, which was high, and the bending resistance was flexible at 9.5 mN · cm. Furthermore, the wearability (dust removal property) was also good.
This fibrous activated carbon triple woven fabric is pad-dried in a processing bath containing 3 wt% fluorine-based water repellent (Nuva N2114 manufactured by Clariant Co., Ltd.), and then subjected to fixing treatment at 170 ° C., and 1 wt. %. When this material was immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 0%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, it was found that the downstream side permeation concentration was <1 ppm and the gas permeation resistance was high.

<Example 3>
Using Kinoor spun yarn (product number KY-04, count 20 / 1Ne) manufactured by Gunei Chemical Industry Co., Ltd. having a single fiber fineness of 2.2 dtex and a yarn fineness of 295 dtex, a driving density of 44, 44 yarns / 2.54 cm, A double woven fabric of weft 46, 46 / 2.54 cm was woven. This fabric has a basis weight of 227 g / m ² , a thickness of 0.52 mm, a bulk density of 0.44 g / cm ³ , a breathability of 153 cm ³ / cm ² · s, and a tensile strength of 315 N / 5 cm in the vertical direction and 321 N in the transverse direction. / 5cm.
The woven fabric was carbonized from normal temperature to 890 ° C. for 30 minutes in an inert atmosphere, and then activated for 90 minutes at a temperature of 890 ° C. in an atmosphere containing 12 wt% of water vapor. The obtained fibrous activated carbon double woven fabric has a dry basis weight of 134 g / m ² , a thickness of 0.47 mm, a bulk density of 0.29 g / cm ³ , a breathability of 115 cm ³ / cm ² · s, and a high tensile strength. It was strong with a direction of 19 N / 5 cm and a width of 20 N / 5 cm. The toluene adsorption performance is 72 g / m ^2, BET specific surface area of those having a 1550 m ² / g and a high adsorption performance, bending resistance was as flexible and 8.7mN · cm. Furthermore, the wearability (dust removal property) was also good.
This fibrous activated carbon double woven fabric is pad-dried in a processing bath containing 3 wt% fluorine-based water repellent (Nuva N2114 manufactured by Clariant Co., Ltd.), and then subjected to fixing treatment at 170 ° C. 1 wt% was added. When this material was immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 0%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, it was found that the downstream side permeation concentration was <1 ppm and the gas permeation resistance was high.

<Comparative Example 1>
Using Kinoor spun yarn (product number KY-04, count 20/1 Ne) manufactured by Gunei Chemical Industry Co., Ltd. having a single fiber fineness of 2.2 dtex and a yarn fineness of 295 dtex, a driving density of 104 yarns / 2.54 cm, weft 104 A plain / 2.54 cm plain fabric was woven. This fabric has a basis weight of 269 g / m ² , a thickness of 0.37 mm, a bulk density of 0.73 g / cm ³ , a breathability of 67 cm ³ / cm ² · s, and a tensile strength of 322 N / 5 cm in the vertical direction and 324 N in the transverse direction. / 5cm.
The woven fabric was carbonized from normal temperature to 890 ° C. for 30 minutes in an inert atmosphere, and then activated for 90 minutes at a temperature of 890 ° C. in an atmosphere containing 12 wt% of water vapor. The obtained fibrous activated carbon plain fabric has a dry basis weight of 156 g / m ² , a thickness of 0.30 mm, a bulk density of 0.52 g / cm ³ , and a breathability of 27 cm ³ / cm ² · s, and the tensile strength is vertical. It was tough with 25 N / 5 cm and a width direction of 23 N / 5 cm. The toluene adsorption performance was 63 g / m ² , and the BET specific surface area was 1350 m ² / g. However, since the bulk density is high, the bending resistance is as high as 14.8 mN · cm, which is inferior in flexibility. Abrasion (dust removal) was good.
This fibrous activated carbon plain fabric is pad-dried in a processing bath containing 3 wt% fluorine-based water repellent (Nuva N2114 manufactured by Clariant Co., Ltd.), then subjected to fixing treatment at 170 ° C., and 1 wt. %. When this material was immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 0%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, it was found that the downstream side permeation concentration was <1 ppm and the gas permeation resistance was high.

<Comparative Example 2>
Using Kinoor spun yarn (product number KY-04, count 20/1 Ne) manufactured by Gunei Chemical Industry Co., Ltd., having a single fiber fineness of 2.2 dtex and a yarn fineness of 295 dtex, a driving density of 42 yarns / 2.54 cm, weft 42 A plain / 2.54 cm plain fabric was woven. This fabric has a basis weight of 105 g / m ² , a thickness of 0.33 mm, a bulk density of 0.32 g / cm ³ , a breathability of 285 cm ³ / cm ² · s, and a tensile strength of 150 N / 5 cm in the vertical direction and 143 N in the transverse direction. / 5cm.
The woven fabric was carbonized from normal temperature to 890 ° C. for 30 minutes in an inert atmosphere, and then activated for 90 minutes at a temperature of 890 ° C. in an atmosphere containing 12 wt% of water vapor. Two sheets of the obtained fibrous activated carbon plain fabric were overlapped. The obtained two-layered fibrous activated carbon plain fabric has a dry basis weight of 108 g / m ² , a thickness of 0.51 mm, a bulk density of 0.21 g / cm ³ , a breathability of 133 cm ³ / cm ² · s, and a tensile strength. The vertical direction was 23 N / 5 cm, and the horizontal direction was 21 N / 5 cm. The toluene adsorption performance is 48 g / m ^2, BET specific surface area of those having a 1264m ² / g and a high adsorption performance, bending resistance was as flexible and 8.6mN · cm. However, when only two plain woven fabrics were superposed, the superposed surfaces were rubbed and the activated carbon powder fell off and a hole opened, making it unusable for practical use.
This fibrous activated carbon plain fabric double-layered product is pad-dried in a processing bath containing 3 wt% fluorine-based water repellent (Nuva N2114 manufactured by Clariant Co., Ltd.), and then subjected to fixing treatment at 170 ° C. The solid content was 1 wt%. When this material was immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 0%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, it was found that the downstream side permeation concentration was <1 ppm and the gas permeation resistance was high.

<Comparative Example 3>
The same plain woven fabric as in Comparative Example 2 was woven to produce a similar fibrous activated carbon plain woven fabric. Two sheets of the obtained fibrous activated carbon plain woven fabric were stacked and laminated with a non-woven hot melt adhesive made of an amide resin. The obtained fibrous activated carbon plain woven double-layer bonded product has a dry basis weight of 147 g / m ² , a thickness of 0.52 mm, a bulk density of 0.28 g / cm ³ , and a breathability of 119 cm ³ / cm ² · s. The strength was strong with a vertical direction of 29 N / 5 cm and a horizontal direction of 35 N / 5 cm. Further, the toluene adsorption performance was 47 g / m ² and the BET specific surface area was as high as 1063 m ² / g. However, since two plain woven fabrics were bonded, the bending resistance was as high as 18.7 mN · cm, and the flexibility was poor. Abrasion (dust removal) was good.
This fibrous activated carbon plain woven double-layer bonded product is pad-dried in a processing bath containing 3 wt% fluorine-based water repellent (Nuva N2114 manufactured by Clariant Co., Ltd.), and then subjected to fixing treatment at 170 ° C. 1 wt% of the solid agent was added. When this material was immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 0%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, it was found that the downstream side permeation concentration was <1 ppm and the gas permeation resistance was high.

<Comparative example 4>
A milled knitted fabric was knitted with a 22 gauge double-sided circular knitting machine using Kinoor spun yarn (product number KY-04, count 20/1 Ne) manufactured by Gunei Chemical Industry Co., Ltd. having a single fiber fineness of 2.2 dtex and a yarn fineness of 295 dtex. . This knitted fabric has a basis weight of 419 g / m ² , a thickness of 1.70 mm, a density of 30 wal / 2.54 cm, a 59 course / 2.54 cm, a bulk density of 0.25 g / cm ³ , and a breathability of 167 cm ³ / cm ² · s. The tensile strength was 379 N / 5 cm in the vertical direction (Wale direction) and 384 N / 5 cm in the transverse direction (course direction).
This knitted fabric was carbonized from normal temperature to 890 ° C. for 30 minutes in an inert atmosphere, and then activated for 90 minutes at a temperature of 890 ° C. in an atmosphere containing 12 wt% of water vapor. The obtained fibrous activated carbon knitted fabric has a dry basis weight of 220 g / m ² , a thickness of 1.10 mm, a bulk density of 0.20 g / cm ³ , a gas permeability of 182 cm ³ / cm ² · s, and a toluene adsorption performance of 121 g / m. ^{2. The} BET specific surface area had a high adsorption performance of 1580 m ² / g, and the bending resistance was as flexible as 8.2 mN · cm. However, the tensile strength was as small as 9N / 5cm in the vertical direction and 8N / 5cm in the lateral direction, and the wear resistance of the loop portion was low, so that the activated carbon powder dropped out and a hole was formed.
This fibrous activated carbon knitted fabric is pad-dried in a processing bath containing 3 wt% of a fluorine-based water repellent (Nuva N2114 manufactured by Clariant Co., Ltd.), and then subjected to fixing treatment at 170 ° C., and the water repellent solid content is 1 wt%. It was attached. When this material was immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 0%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, it was found that the downstream side permeation concentration was <1 ppm and the gas permeation resistance was high.

<Comparative Example 5>
Using Kinoru spun yarn (product number KY-04, count 20/1 Ne) manufactured by Gunei Chemical Industry Co., Ltd. having a single fiber fineness of 2.2 dtex and a yarn fineness of 295 dtex, a driving density of 90, 90 pieces / 2.54 cm, A double woven fabric of weft 92, 92 pieces / 2.54 cm was woven. This fabric has a basis weight of 457 g / m ² , a thickness of 0.56 mm, a bulk density of 0.82 g / cm ³ , a breathability of 53 cm ³ / cm ² · s, and a tensile strength of 643 N / 5 cm in the vertical direction and 659 N in the horizontal direction. / 5cm.
The woven fabric was carbonized from normal temperature to 890 ° C. for 30 minutes in an inert atmosphere, and then activated for 90 minutes at a temperature of 890 ° C. in an atmosphere containing 12 wt% of water vapor. The obtained fibrous activated carbon double woven fabric has a dry basis weight of 273 g / m ² , a thickness of 0.47 mm, a bulk density of 0.58 g / cm ³ , and a breathability of 23 cm ³ / cm ² · s, and has a high tensile strength. The direction was 44 N / 5 cm, and the width was 43 N / 5 cm. The toluene adsorption performance was 127 g / m ² , and the BET specific surface area was 1293 m ² / g. However, since the bulk density is high, the bending resistance is as high as 15.3 mN · cm, which is inferior in flexibility. Abrasion (dust removal) was good.
This fibrous activated carbon double woven fabric is pad-dried in a processing bath containing 3 wt% fluorine-based water repellent (Nuva N2114 manufactured by Clariant Co., Ltd.), and then subjected to fixing treatment at 170 ° C. 1 wt% was added. When this material was immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 0%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, it was found that the downstream side permeation concentration was <1 ppm and the gas permeation resistance was high.

<Comparative Example 6>
The same triple woven fabric as in Example 1 was woven to produce a similar fibrous activated carbon triple woven fabric. The fibrous activated carbon triple woven fabric was not subjected to water-repellent treatment, and after being immersed in pure water for 1 minute, taken out and dehydrated, the water content of the material was 98%. As a result of evaluating the gas permeation resistance by overlaying the outer layer material on this material, the permeation concentration on the downstream side was> 1 ppm, and the gas permeation resistance was poor.

The fibrous activated carbon multi-woven fabric of the present invention has high tensile strength and abrasion resistance, excellent flexibility, good handleability, excellent processability such as laminating, and even when wet with water, sweat, etc. It is possible to provide a fibrous activated carbon sheet having water repellency that has a large adsorption performance with respect to organic solvent gas per area.
Furthermore, it is possible to provide a fibrous activated carbon multi-woven fabric having excellent quality and quality by stable shrinkage even in a continuous carbonization / activation process during industrial production, which greatly contributes to the industry.

1: Upper glass cell 2: Lower glass cell 3: Fibrous activated carbon fabric 4: Outer layer material 5: Paraffin sealing 6: Test solution 7: Sampling port (silicon cap)

Claims (4)

The bulk density exceeds 0.19 g / cm ³ and is 0.5 g / cm ³ or less, the dry basis weight is 60 to 250 g / m ² , 7.2 water repellency test (spray test) of JIS L1092 (2009) A fibrous activated carbon multi-woven fabric characterized by having a water repellency of 2nd grade or higher.   The fibrous activated carbon multiple fabric according to claim 1, wherein the tensile strength is 10 N / 5 cm or more.   A protective garment using the fibrous activated carbon multiple fabric according to claim 1 or 2.   The method for producing a fibrous activated carbon multi-woven fabric according to claim 1 or 2, wherein a multi-woven fabric comprising yarns of precursor fibers of fibrous activated carbon is carbonized and activated in a batch or continuous manner.