JP2012125717A - Sheet for gas adsorption, and air cleaning filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet for gas adsorption capable of eliminating a volatile organic compound or ozone while having a sufficient flame retardancy when burnt and favorable in adhesion of a honeycomb type filter, and to provide an air cleaning filter.SOLUTION: The sheet for gas adsorption has a single layer structure including an activated carbon, a hardly water-soluble flame retardant, a fibrillated fiber, and a binder fiber.

Description

  The present invention relates to a gas adsorbing sheet and a honeycomb type air purifying filter using the same. Specifically, it has good adhesion when it is made into a honeycomb type air purification filter, and also has excellent flame retardant properties for removing volatile organic compounds and ozone, and a honeycomb type air purification using the same. It relates to filters.

  In recent years, electronic devices such as copiers, printers, multi-function OA machines, computers, projectors, and POD printers have been increasingly integrated and miniaturized. It is becoming indispensable. In addition, various components contained in components such as ink, toner, etc. used for printing, plastics constituting the main body of electronic equipment, rubber used in various joints, etc. are gasified, and harmful gas components It is discharged into the room along with exhaust heat. In addition, since a high voltage is used in a copying machine, a laser printer, and the like, not only the gas components but also harmful gas components such as ozone are discharged. In recent years, due to increased awareness of environmental issues, emission regulations have been implemented for harmful gas components. For example, in Germany, an environmental label “BAM (Blue Angel Mark)” has been established, and environmental performance standards to be achieved for each electronic device are defined.

  In order to reduce harmful gas components discharged from the electronic device, an air cleaning filter is incorporated in the electronic device. Since the air purifying filter is incorporated in an electronic device, it not only excels in removing harmful gas components, but it is essential to obtain a flame retardant standard UL (Underwriters Laboratories Inc.) (see Non-Patent Document 1).

  Air purifying filters for removing ozone and volatile organic compounds by being incorporated in electronic devices such as laser printers and various air conditioning devices are well known. Patent Document 1 has proposed a honeycomb-type air cleaning filter in which a water-soluble flame retardant is contained in activated carbon that defines the pore volume of specific pores. Although it was possible to impart flame retardancy by including a flame retardant, the use of a water-soluble flame retardant obstructs some of the pores of the activated carbon and reduces the removal performance of volatile organic compounds and ozone gas. Had.

  In order to solve the problem of Patent Document 1, Patent Documents 2 and 3 propose a flame retardant formulation in which the flame retardant is changed from water-soluble to water-insoluble and the activated carbon pores are not blocked. Although it was possible to maintain the removal of the original ozone and volatile organic compounds from the activated carbon and to impart flame retardant performance, the honeycomb base was made of a multilayer structure with activated carbon and a flame-retardant flame retardant applied to the sheet base material. When the filter was used, the adhesiveness between the corrugated sheet and the flat sheet was poor, and the productivity and handleability were poor.

  As mentioned above, air purification filters built into electronic devices such as copiers, printers, multifunction OA machines, computers, projectors, POD printers, etc., remove toxic organic compounds, ozone and other harmful gas components, and flame retardancy No good filter productivity and handleability were obtained.

JP 60-225640 A JP 2000-157825 A JP 2001-276608 A

UL 94: Standard for Safety Tests for Flammability of Plastic Materials for Parts in Devices and Applications.

  The present invention was devised in view of the above-described state of the art, and is incorporated into electronic devices such as copiers, printers, multi-function OA machines, computers, projectors, and POD printers to remove harmful gas components. An object of the present invention is to provide a gas adsorption sheet and an air purification filter that can be fired and that have sufficient flame retardancy during combustion and that have good adhesion to the honeycomb type air purification filter.

As a result of intensive studies to achieve the above object, the present inventor has completed the present invention by incorporating activated carbon and a hardly water-soluble flame retardant into a single-layered sheet.
That is, the present invention is as follows.

(1) A gas adsorption sheet having a single layer structure including activated carbon, a hardly water-soluble flame retardant, fibrillated fibers, and binder fibers.
(2) The gas adsorption sheet according to (1), wherein the hardly water-soluble flame retardant is melamine phosphate or aluminum phosphate.
(3) An air cleaning filter obtained by processing the gas adsorption sheet according to (1) or (2) into a honeycomb shape.

  The gas adsorption sheet and the air purification filter of the present invention can remove ozone and volatile organic compounds, have sufficient flame retardancy during combustion, and have good adhesion to the honeycomb filter. There is an advantage that it is possible to provide a safety sheet and an air cleaning filter.

The cross-sectional schematic of the sheet | seat for gas adsorption | suction of this invention is shown. The cross-sectional schematic which made the sheet | seat for gas adsorption | suction of this invention the single-stage cardboard sheet | seat is shown. 1 is a schematic cross-sectional view of a honeycomb type air purification filter in which single-stage cardboard sheets are laminated.

  Hereinafter, the gas adsorption sheet and the air purifying filter of the present invention will be described in detail. As shown in FIG. 1, the gas adsorption sheet of the present invention is a single-layered sheet containing at least activated carbon, a hardly water-soluble flame retardant, a fibrillated fiber, and a binder fiber. This sheet is used as a honeycomb type air purification filter. It is characterized by that.

  The production method of the gas adsorption sheet of the present invention is not particularly limited and can be produced by a known sheeting method, but a wet papermaking method capable of increasing the density of the sheet is preferable. The wet papermaking method is a manufacturing method in which raw materials are dispersed in water, filtered through a net, and dried.

  The activated carbon used in the present invention is not particularly limited, and known activated carbon can be used. Examples of the activated carbon include wood, fruit husk (coconut husk, coconut husk, rice husk, coffee beans, etc.), cellulose, lignin, It can be obtained by using plant raw materials such as pulp, mineral raw materials such as lignite, lignite, peat, anthracite, petroleum sludge, etc., and chemical activation using zinc chloride or gas activation using steam. .

  The activated carbon used in the present invention may be in the form of powder, granule, or fiber, but in order to increase the density in the gas adsorption sheet, powder or granule is preferred.

  As a particle size of a granular activated carbon, 1-100 micrometers is preferable, More preferably, it is 1-80 micrometers. Moreover, in order to fix activated carbon to the fiber surface, the range of 1-30 micrometers is preferable. Activated carbon having a particle size of less than 1 μm has poor handleability such as scattering and adhesion, and on the other hand, activated carbon having a particle size of more than 100 μm makes it difficult to make a thin layer for gas adsorption, and may cause the activated carbon to peel from the sheet. is there.

The specific surface area of the activated carbon used in the present invention is preferably ^{800~2,000m 2 / g, 1,000~1,600m 2 /} g is more preferable. If the specific surface area of the activated carbon is smaller than 800 m ² / g, the removal performance of volatile organic compounds and ozone may be lowered. On the other hand, when the specific surface area of the activated carbon is larger than 2,000 m ² / g, the hardness of the activated carbon is lowered, and there is a possibility that it may be pulverized in a pressing process at the time of manufacturing a sheet and a honeycomb.

In the present invention, the amount of activated carbon contained in the gas adsorption sheet is preferably 5 to 50 g / m ² . More preferably, it is 7-45 g / m < ² >, More preferably, it is 10-40 g / m < ² >. If it is less than 5 g / m ² , sufficient removal performance of volatile organic compounds and ozone cannot be obtained. On the other hand, if it exceeds 50 g / m ² , the gas adsorbing sheet becomes thick and workability deteriorates. In addition, when processed into a honeycomb shape, there is a possibility that the aperture ratio becomes small and the pressure loss of the passing air becomes large.

  In the present invention, the total content of activated carbon contained in the gas adsorption sheet is preferably 10 to 80% by weight with respect to the gas adsorption sheet. More preferably, it is 20 to 70% by weight. When the activated carbon content is less than 10% by weight, the amount of activated carbon that functions to remove volatile organic compounds and ozone is insufficient, and thus the removal performance may not be sufficient. On the other hand, when it exceeds 80% by weight, the strength of the gas adsorbing sheet is lowered, and the workability may be deteriorated.

  The activated carbon used in the present invention may be impregnated with an alkali metal compound and an alkaline earth metal compound. By attaching an alkali metal compound and an alkaline earth metal compound to activated carbon, the lifetime of ozone and acid gas can be extended. The alkali metal compound and alkaline earth metal compound to be used are not particularly limited as long as they are inorganic or organic compounds containing alkali metal and alkaline earth metal, respectively. Examples of the alkali metal compound include sodium, Hydroxides of alkali metals such as potassium and lithium; oxides; carbonates, bicarbonates, acetates, oxalates, phosphates, sulfates, succinic acid, phthalic acid, hydrogen phthalate, etc. Salts thereof; halides and the like. Alkaline earth metal compounds such as calcium, magnesium and barium hydroxides; oxides; water-soluble salts such as carbonates, acetates, oxalates and phosphates; halides Etc. In use, one or more of these alkali metal compounds and alkaline earth metal compounds can be used. Examples of the method of attaching the alkali metal compound or alkaline earth metal compound include a method of attaching to activated carbon before forming into a sheet, and a method of attaching by spraying or dipping after forming into a sheet.

  In the present invention, the addition amount of the alkali metal compound and the alkaline earth metal compound is preferably 10 to 100% by weight with respect to the activated carbon in the gas adsorption sheet. More preferably, it is 15-95 weight%, More preferably, it is 20-90 weight%. If the content of the alkali metal compound and alkaline earth metal compound is less than 10% by weight, there is a problem that the effect of removing ozone is reduced. If the content is more than 100% by weight, the ozone removal performance is improved but the flame retardancy is inferior. There is.

  The poorly water-soluble flame retardant used in the present invention is a flame retardant having a solubility in water at 20 ° C. of 1% by weight or less, such as aluminum metaphosphate, melamine phosphate, magnesium phosphate, condensed phosphate amide, etc. An inorganic flame retardant such as aluminum hydroxide or magnesium hydroxide can be used. One or more of these flame retardants may be used in combination.

  In the present invention, the amount of the hardly water-soluble flame retardant added in the gas adsorption sheet is preferably 8 to 100% by weight with respect to the activated carbon in the gas adsorption sheet. More preferably, it is 10-80 weight%, More preferably, it is 12-60 weight%. If the content of the flame retardant is less than 8% by weight, there is a problem that sufficient flame retardant effect cannot be obtained and the standard specified by UL cannot be satisfied. Since the number of points decreases, there is a problem that the ozone removal performance of the gas adsorption sheet is lowered.

  In addition to the hardly water-soluble flame retardant used in the present invention, water-soluble flame retardants such as guanidine phosphate and ammonium phosphate may be used. The addition amount of the water-soluble flame retardant is preferably 0.2 to 5% by weight with respect to the activated carbon of the gas adsorbing sheet. More preferably, it is 0.5-4 weight%, More preferably, it is 1-3 weight%. If the content of the water-soluble flame retardant is less than 0.2% by weight, the flame retardant effect due to the addition of the water-soluble flame retardant cannot be obtained, and if it exceeds 5% by weight, the ozonolysis active sites on the activated carbon decrease. Therefore, there exists a problem that the ozone removal performance of the sheet | seat for gas adsorption falls.

  Examples of the fibrillated fibers used in the present invention include fibers that can be fibrillated such as Manila hemp pulp, NBKP pulp, polyolefin-based pulp, acrylic pulp, aramid pulp, and ceramic pulp. When powdered activated carbon or a hardly water-soluble flame retardant is used, the use of fibrillated fibers having a large fiber surface area improves the fixability of the powdered material. For reinforcing the fibril fibers, short fibers such as rayon, polyethylene, polyester, polypropylene, ceramic fibers, and glass fibers may be used.

  In the present invention, the mixing ratio of the fibrillated fibers is preferably 10 to 50% by weight with respect to the activated carbon in the gas adsorption sheet. More preferably, it is 15-45 weight%, More preferably, it is 20-40 weight%. If the mixing ratio of the fibrillated fiber is less than 10% by weight, there is a problem that the fixability of the powdered activated carbon or the hardly water-soluble flame retardant is deteriorated. There is a problem that decreases.

  Examples of the binder fiber used in the present invention include fibers such as polyvinyl alcohol fiber, polyolefin fiber, and polyester fiber. In order to obtain an auxiliary binder effect, a powdery binder may be used.

  In the present invention, the mixing ratio of the binder fiber is preferably 5 to 15% by weight with respect to the activated carbon in the gas adsorption sheet. More preferably, it is 6-14 weight%, More preferably, it is 7-13 weight%. When the mixing ratio of the binder fibers is less than 5% by weight, there is a problem that the strength of the gas adsorbing sheet is greatly reduced.

In the present invention, the basis weight of the gas adsorption sheet is preferably 10 to 100 g / m ² . More preferably, it is 20-80 g / m < ² >. When the basis weight of the sheet is less than 10 g / m ^{2, the} effect of removing volatile organic compounds and ozone is small, and when the sheet weight is greater than 100 g / m ² , the sheet becomes thick, and when the gas adsorption sheet is processed into a honeycomb shape, the aperture ratio is increased. There is a possibility that a problem arises that the pressure loss of the air passing therethrough increases and the pressure loss of the passing air increases.

  The thickness of the gas adsorption sheet of the present invention is preferably 0.05 to 0.3 mm. If the sheet thickness is less than 0.05 mm, the strength during folding into the honeycomb shape is insufficient, and if the sheet thickness exceeds 0.3 mm, the gas adsorbent sheet is processed into a honeycomb shape. In this case, there is a possibility that the aperture ratio becomes small and the pressure loss of the passing air becomes large.

  A conventionally known processing method can be used as the method for forming the gas adsorption sheet of the present invention into a honeycomb shape. In addition, in the present invention, the honeycomb shape means a shape in which a hollow column such as a quadrangular, sinusoidal, roll shape or the like, or a hollow columnar body such as a cylinder, is continuous in addition to a hexagonal cross section. For example, in order to make the gas adsorption sheet into a sinusoidal honeycomb shape, first, the gas adsorption sheet is passed through a shaping roll and shaped into a waveform, and the corrugated gas adsorption sheet is flat on one or both sides. Join. This is laminated to form a sinusoidal honeycomb filter. Here, it is normal to attach and fix an adhesive at the top of the corrugation, but when a corrugated gas adsorbing sheet is laminated, the flat sheet in between is necessarily fixed, so an adhesive is always applied. There is no need. In addition, when attaching an adhesive agent, it is necessary to use what does not impair the adsorption | suction ability of a sheet | seat. As the adhesive, for example, corn starch, vinyl acetate resin, acrylic resin and the like can be suitably used. In order to enhance the ozone removal performance, the adhesion pitch of the corrugated gas adsorbing sheet is preferably reduced and the peak height is reduced. As a preferable range, the pitch is 0.5 to 8 mm, and the peak height is 0.4 to 5 mm.

  The aperture ratio of the air cleaning filter of the present invention can be controlled by adjusting the thickness, pitch, and peak height of the sheet, and the preferred range is 50 to 90%. When the aperture ratio is less than 50%, the pressure loss of the fluid passing therethrough increases, and when it exceeds 90%, the durability may decrease in terms of strength.

  The gas adsorption sheet and air purifying filter of the present invention configured as described above do not drop activated carbon particles in the activated carbon layer not only during normal use but also during combustion, so that harmful gas components are effectively removed. Not only can it be removed, it has high flame resistance that satisfies UL standard 94V-O.

  Hereinafter, the working effects of the gas adsorbing sheet and the air purifying filter of the present invention will be specifically described by way of examples, but the present invention is not limited thereto. In addition, the evaluation method of the characteristic value measured in the Example is shown below.

(Flame retardance)
Evaluation based on UL94V test method defined in UL described in Non-Patent Document 1 (Standard for Test for Flammability of Plastics Materials for Devices-Appliances and Applications-V94 94). 2). The flammability grade was calculated from the flammable combustion time and flameless combustion time specified in the UL94 test method, and those that did not meet the specified standard were rejected as flame retardant.

(Ozone removal rate)
Air having an ozone concentration of 1 ppm was passed through an air purification filter having a layer length of 15 mm at a wind speed of 1 m / sec, and the ozone concentrations at the inlet and outlet sides of the column were measured. The measurement conditions were a temperature of 25 ° C. and a humidity of 50%. These measured values were substituted into the following formula 1 to calculate the ozone removal rate (%). In addition, in order to obtain | require initial efficiency, the ozone removal rate after 1 minute and 100 hours after a measurement start was calculated | required.

(Toluene removal rate)
Air having a toluene concentration of 5 ppm was passed through an air cleaning filter having a layer length of 15 mm at a wind speed of 1 m / sec, and the toluene concentrations at the inlet and outlet sides of the column were measured. The measurement conditions were a temperature of 25 ° C. and a humidity of 50%. These measured values were substituted into the following formula 2 to calculate the toluene removal rate (%). In addition, in order to obtain | require initial efficiency, the toluene removal rate in 1 minute after the measurement start was calculated | required.

(Pressure loss)
Air was passed through an air purification filter having a layer length of 15 mm at a wind speed of 1 m / sec, and the pressure loss was measured from the differential pressure between the inlet side and the outlet side of the column. The measurement conditions were a temperature of 25 ° C. and a humidity of 50%.

(Average particle diameter)
Each particle was observed with a scanning electron microscope (SEM), the diameter of 100 particles was measured, and the average diameter was calculated therefrom.

(Average fiber diameter)
Each particle was observed with a scanning electron microscope (SEM), the diameter of 100 fibers was measured, and the average diameter was calculated therefrom.

(Honeycomb adhesiveness)
A sample in which two single-stage cardboard sheets having a pitch of 2.6 mm and a peak height of 1.2 mm were laminated as shown in FIG. 3 was produced. The sample size is cut to a width of 50 mm and a length of 250 mm, and 50 mm is peeled off in advance. Then, it installed in the tensile tester and peel strength between 100 mm was measured at the tensile speed of 100 mm / min. Since the adhesion points are 2.6 mm apart, 5 points were picked up from the maximum strength to show discontinuous strength, and the average value was taken as the peel strength. Samples that peel exquisitely can show the peel strength as a numerical value, but samples that the gas adsorbing sheet cuts during the test were considered as material destruction. In the case of material destruction, the honeycomb adhesiveness is good because it represents that the honeycomb adhesiveness is higher than the cutting strength of the gas adsorption sheet.

<Example 1>
12.5 g / m ² of woody activated carbon having an average particle diameter of 20 μm and 25 g / m ^{2 of} melamine phosphate having a mean particle diameter of 12 μm (solubility in water at 20 ° C .: 0.2% by weight) as a hardly water-soluble flame retardant. , NBKP pulp of fibrillated fiber is mixed at 10 g / m ² , polyvinyl alcohol fiber having an average fiber diameter of 12 μm as binder fiber is mixed at 2.5 g / m ² , wet papermaking is performed, and the basis weight is 50 g / m ² , thickness 0 A 15 mm gas adsorption sheet was prepared. Next, the sheet | seat for gas adsorption | suction was shape | molded into the corrugated sheet machine with the pitch 2.6mm and the peak height 1.2mm using the corrugating machine. The single cardboard sheets were stacked and cut to obtain a honeycomb type air purification filter having a layer length of 15 mm.

<Example 2>
12.5 g / m ² of woody activated carbon having an average particle diameter of 20 μm and 25 g / m ^{2 of} melamine phosphate having a mean particle diameter of 12 μm (solubility in water at 20 ° C .: 0.2% by weight) as a hardly water-soluble flame retardant. , 10 g / ^{m 2} of NBKP pulp fibrillated fibers, average polyvinyl alcohol fibers having an average fiber diameter of 12μm as a binder fiber and 2 g / ^{m 2} fiber diameter 14 [mu] m, a fiber length of 5mm sheath polyester fiber (core melting point: 260 ° C. , Sheath melting point: 110 ° C.) was mixed so as to be 0.5 g / m ² , and wet papermaking was performed to produce a sheet for gas adsorption having a basis weight of 50 g / m ² and a thickness of 0.15 mm. Next, the sheet | seat for gas adsorption | suction was shape | molded into the corrugated sheet machine with the pitch 2.6mm and the peak height 1.2mm using the corrugating machine. The single cardboard sheets were stacked and cut to obtain a honeycomb type air purification filter having a layer length of 15 mm.

<Comparative Example 1>
25g / m ² wood based activated carbon with an average particle diameter of 20μm, 10g / m ^{2 of} fibrillated NBKP pulp, 2g / m ² of polyvinyl alcohol fiber with an average fiber diameter of 12μm as binder fiber, an average fiber diameter of 14μm, fiber length 5 mm core-sheath polyester fiber (melting point of core part: 260 ° C., melting point of sheath part: 110 ° C.) was blended so as to be 0.5 g / m ² , wet papermaking was performed, the basis weight was 37.5 g / m ² , and the thickness was 0. A 13 mm wet sheet was prepared. The wet sheet was impregnated with 7.5 g / m ^{2 of} water-soluble flame retardant guanidine phosphate to produce a gas adsorption sheet having a basis weight of 45 g / m ² and a thickness of 0.14 mm. Next, the sheet | seat for gas adsorption | suction was shape | molded into the corrugated sheet machine with the pitch 2.6mm and the peak height 1.2mm using the corrugating machine. The single cardboard sheets were stacked and cut to obtain a honeycomb-shaped air purification filter having a layer length of 15 mm.

<Comparative example 2>
NBKP pulp of fibrillated fiber is 10 g / m ² , polyvinyl alcohol fiber having an average fiber diameter of 12 μm as binder fiber is 2 g / m ² , average fiber diameter of 14 μm, core sheath polyester fiber having a fiber length of 5 mm (core melting point: 260 ° C., (Sheath part melting point: 110 ° C.) was mixed so as to be 0.5 g / m ² , and wet papermaking was performed to prepare a wet sheet having a basis weight of 12.5 g / m ² and a thickness of 0.06 mm. To both surfaces of this wet sheet, paste wood based activated carbon having an average particle diameter of 20 μm, melamine phosphate having an average particle diameter of 12 μm (solubility in water at 20 ° C .: 0.2%), sodium alginate as a binder component, and paste The wet sheet was coated as a shape. The coating amount is 25 g / m ^{2 for} activated carbon, 12.5 g / m ^{2 for} melamine phosphate, 5 g / m ^{2 for} sodium alginate, and a sheet for gas adsorption with a basis weight of 55 g / m ² and a thickness of 0.15 mm. Produced. Next, the sheet | seat for gas adsorption | suction was shape | molded into the corrugated sheet machine with the pitch 2.6mm and the peak height 1.2mm using the corrugating machine. The single cardboard sheets were stacked and cut to obtain a honeycomb-shaped air purification filter having a layer length of 15 mm.

<Comparative Example 3>
NBKP pulp of fibrillated fiber is 10 g / m ² , polyvinyl alcohol fiber having an average fiber diameter of 12 μm as binder fiber is 2 g / m ² , average fiber diameter of 14 μm, core sheath polyester fiber having a fiber length of 5 mm (core melting point: 260 ° C., (Sheath part melting point: 110 ° C.) was mixed so as to be 0.5 g / m ² , and wet papermaking was performed to prepare a wet sheet having a basis weight of 12.5 g / m ² and a thickness of 0.06 mm. On both surfaces of this wet sheet, a wood-type activated carbon having an average particle diameter of 20 μm, a water-soluble flame retardant guanidine phosphate and a binder component sodium alginate were added to form a paste to coat the wet sheet. The coating amount is 25 g / m ^{2 for} activated carbon, 7.5 g / m ^{2 for} guanidine phosphate, 5 g / m ^{2 for} sodium alginate, and a gas adsorption sheet having a basis weight of 50 g / m ² and a thickness of 0.15 mm. Produced. Next, the sheet | seat for gas adsorption | suction was shape | molded into the corrugated sheet machine with the pitch 2.6mm and the peak height 1.2mm using the corrugating machine. The single cardboard sheets were stacked and cut to obtain a honeycomb-shaped air purification filter having a layer length of 15 mm.

  Details of the structures of the air purification filters obtained in Examples 1 and 2 and Comparative Examples 1 to 3 are shown in Table 1, and the evaluation results of the ozone removal rate, pressure loss, flame retardance, and honeycomb adhesion are shown in Table 2.

  As is clear from Tables 1 and 2, Examples 1 and 2 have a high ozone removal rate, UL94V-0 in the UL flame retardant test, and the adhesiveness is good enough to cause material destruction of the honeycomb. The characteristics have been greatly improved. On the other hand, since Comparative Example 1 uses a water-soluble flame retardant, the ozone removal rate, the initial stage, and the lifetime are low. In Comparative Example 2, the gas adsorbing sheet has three layers, and the sheet surface is covered with particles, so that the adhesiveness of the honeycomb is weak, the handling is bad, the honeycomb may be broken during transportation, and excessive packaging is required. Comparative Example 3 has poor ozone removal rate and honeycomb adhesion.

  The gas adsorption sheet and air purifying filter of the present invention are excellent in the removal and flame retardancy of harmful gas components such as volatile organic compounds and ozone, and have good adhesion of the honeycomb type filter. It can be suitably used for an air cleaning filter or the like for removing harmful gas components contained in the exhaust gas of electronic devices such as functional OA machines, computers, projectors, and POD printers.

DESCRIPTION OF SYMBOLS 1 Activated carbon 2 Water-insoluble flame retardant 3 Fibrilized fiber 4 Binder fiber 5 Gas adsorption sheet

Claims (3)

  A single-layer gas adsorption sheet comprising activated carbon, a hardly water-soluble flame retardant, fibrillated fibers, and binder fibers.   The sheet for gas adsorption according to claim 1, wherein the hardly water-soluble flame retardant is melamine phosphate or aluminum phosphate.   An air purification filter obtained by processing the gas adsorption sheet according to claim 1 or 2 into a honeycomb shape.

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