JP2008200648A - Adsorbent, filtering media, and air filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adsorbent having an excellent removal performance to lower aldehydes, and further, having a high removal efficiency also even in environments such as low humidities and sub-zero temperatures. <P>SOLUTION: The adsorbent is characterized in that an amine compound and polyethylene glycol having a number average molecular weight of 62-600 are supported by a porous body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an adsorbent. More specifically, the present invention relates to an adsorbent effective in adsorbing and removing aliphatic aldehydes contained in odors generated from home and work environments, particularly lower aliphatic aldehydes typified by acetaldehyde, and more particularly to air filter applications.

  There are various types of pollutants in the air, but among them, lower aldehydes are a major problem. For example, acetaldehyde is a typical malodorous component contained in tobacco smoke and automobile exhaust gas, and it is easy to feel odor even at low concentrations. Moreover, activated carbon is generally used to remove pollutants in the air, but the amount of equilibrium adsorption of lower aliphatic aldehydes on activated carbon is significantly smaller than other malodorous components.

  In view of this, a method of removing a nucleophilic reagent that chemically reacts with aldehyde (Patent Document 1) is disclosed.

  It is also well known to add humectants to promote chemical reactions. For example, Patent Document 2 uses an aldehyde drug, a porous material, and a humectant. Patent Documents 3 and 4 disclose an adsorbent and a filter containing a humectant and a deodorant.

  However, the technology of simply including these conventional humectants has no practical effect on the removal of dynamic lower aliphatic aldehydes such as filters.

In addition, since these adsorbents improve the reaction by utilizing moisture retention, they have no effect at all under low humidity, which is an environment with little water, or under an environment of less than 273K where water freezes. There was a drawback to say.
Japanese Patent Publication No. 62-286464 JP-A-9-313828 JP 2003-310728 A JP 2006-192388 A

  An object of the present invention is to provide an adsorbent that is excellent in removal performance for lower aldehydes and that has high removal efficiency even in an environment such as low humidity or below freezing.

  That is, the present invention is an adsorbent characterized in that the porous body carries an amine compound and polyethylene glycol having a number average molecular weight of 62 to 600.

  The present invention also provides a filter medium comprising fibers carrying the adsorbent of the present invention.

  The present invention is also an air filter using the filter medium of the present invention.

  According to the present invention, it is possible to provide an adsorbent that has high target gas removal efficiency even at low humidity and below freezing point and that does not re-desorb.

  The adsorbent of the present invention has a porous body. The porous body can obtain a surface area that can be contacted with the processing air, and can add a sufficient amount of a deodorizing agent, and can improve the removal efficiency of aldehyde in a dynamic state where the passing air speed is high.

  Examples of porous materials include porous carbon typified by activated carbon, porous silicon carbide, porous titanium carbide, porous silica, zeolite, alumina, apatite, porous glass, aluminum silicate, silica gel, alumina gel, activated clay. , Layered structure porous body, aluminum phosphate, mesoporous body, porous ceramic, porous silicon nitride, porous clay mineral, and the like, and can be selected according to the purpose. Among these, porous silica is preferable because it is inexpensive and has low physical adsorption.

  As an average particle diameter of a porous body, 0.01-200 micrometers is preferable, More preferably, it is 0.1-50 micrometers. When the thickness is 200 μm or less, the contact efficiency with the processing air can be increased, and the carrier can be uniformly supported on the surface of a fiber or the like. Moreover, by setting it as 0.01 micrometer or more, it can prevent that a porous body embeds in the binder resin used for carrying | supporting to the surface of carriers, such as a fiber.

  As a diameter of the pore of a porous body, 0.5-100 nm is preferable, More preferably, it is 50 nm or less. By setting the thickness to 100 nm or less, the specific surface area can be increased without difficulty such as a decrease in mechanical strength of the inorganic particles. Moreover, by setting it as 0.5 nm or more, it can prevent that the chemical | medical agent and object gas component to attach cannot enter the inside of a pore.

  The total pore volume of the porous body is preferably 0.6 to 2.0 ml / g. If it is less than 0.6 ml / g, the amount of chemicals to be attached to the porous material is insufficient, and sufficient removal performance cannot be obtained. Moreover, sufficient intensity | strength is obtained for a porous body by setting it as 2.0 ml / g or less.

The specific surface area of the porous body is preferably 50~1200m ² / g in BET specific surface area, more preferably 100~1000m ² / g. By setting it to 50 m ² / g or more, an effective area is obtained as a reaction field for the chemical to be added, and an effective reaction rate with the gas component to be removed is obtained. Moreover, since it is 1200 m < ² > / g or less due to the decrease in mechanical strength of the porous body, inconvenience in handling can be prevented.

  It is important that the adsorbent of the present invention has an amine compound. The presence of the amine compound dramatically improves the chemical adsorption capacity for aldehydes such as formaldehyde and acetaldehyde.

  Examples of amine compounds that can be used include amine compounds such as hydrazines, aliphatic amines, aromatic amines, and ureas.

Of the amine compounds, acid hydrazides are preferred. The acid hydrazide is a compound having an acid hydrazide group represented by —CO—NHNH ₂ derived from carboxylic acid and hydrazine. Further, a nitrogen atom having an unshared electron pair is bonded to the α-position of the nitrogen atom at the hydrazide terminal, thereby significantly improving the nucleophilic reactivity. It is considered that this unshared electron pair reacts by nucleophilic attack on the carbonyl carbon atom of the aldehyde, and immobilizes the aldehyde as a hydrazide derivative, thereby exhibiting high removal performance for the aldehyde.

  Among the aldehydes, acetaldehyde has an electron donating alkyl group at the α-position of the carbonyl carbon, so the carbonyl carbon has low electrophilicity and is difficult to be chemically adsorbed. However, the acid hydrazides employed in the adsorbent of the present invention are Since the nucleophilic reactivity is high as described above, it exhibits good chemical adsorption performance even for acetaldehyde.

  As acid hydrazide, for example, as acid monohydrazide having one acid hydrazide group in the molecule, form hydrazide, acetohydrazide, propionic acid hydrazide, benzoic acid hydrazide, etc., acid having two acid hydrazide groups in the molecule Examples of the dihydrazide include oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, fumaric acid dihydrazide, maleic acid dihydrazide, terephthalic acid dihydrazide, etc. And polyacrylic acid hydrazide. Especially, the acid dihydrazide which has two acid hydrazide groups in a molecule | numerator is preferable, and adipic acid dihydrazide is more preferable.

  An amine compound may be used individually by 1 type, and may use 2 or more types together.

More preferably, the amine compound is a combination of a primary amine and a secondary amine. By having a primary amine and a secondary amine, the performance as an adsorbent is dramatically improved. The mechanism is not clear, but is presumed as follows.
That is, the primary amine once reacts with the aldehyde, but on the other hand, a part of the aldehyde is eliminated. However, if a secondary amine is present at the same time, it can react with the detached aldehyde. Since secondary amines have high steric hindrance around the amine, once they are combined, it is difficult for the reverse reaction to occur. It is considered that the performance is dramatically improved by passing the aldehyde from the primary amine to the secondary amine.

  Examples of secondary amines include 3,5-dimethylpyrazole, 3-methyl-5-pyrazolone, 1,2,3-triazole, 1,2,4-triazole, and 3-n-butyl-1,2,4- Alzole such as triazole, 3,5-dimethyl-1,2,4-triazole, 3,5-di-n-butyl-1,2,4-triazole, azine, alkyl such as dipropylamine, dibutylamine Secondary amines of the class can be used. In addition, secondary amines of alkyls include amines having an alkyl group in the side chain such as diisobutylamine, and amines having two different alkyl groups for nitrogen such as N-methylhexylamine. .

  In addition, cyclic secondary amines such as piperidine, piperazine, and pyrrolidine can also be used.

  The secondary amine is preferably one having an amide bond or a urea bond in order to prevent re-release of aldehydes. Of these, 1,3-dimethylurea and ethyleneurea are preferred from the viewpoints of high safety, no odor of amine odor, water solubility and good processability.

  Secondary amines may be used alone or in combination of two or more.

  The amine compound employed in the present invention is preferably one that is soluble in polyethylene glycol (hereinafter referred to as “PEG”). This is because by dissolving in PEG, a chemical reaction can be performed with the target gas using PEG as a solvent as described later. The amount of the amine compound dissolved in PEG is preferably 1 g or more, more preferably 5 g or more per 100 g of PEG. By dissolving 1 g or more, the effect of the solvent effect of PEG can be obtained.

  It is important that the adsorbent of the present invention also has polyethylene glycol. PEG can maintain adsorption efficiency even in a low humidity environment. The reason is not clear, but it is thought as follows. That is, lithium chloride, activated alumina, zeolite, and PEG having a molecular weight of 600 or more, which are general moisturizers, attract water-soluble gas due to its water retention effect and improve the gas adsorption and removal performance. In an environment where there is little water or the water freezes, there is insufficient water as a reaction field, and the performance is greatly reduced. On the other hand, the PEG employed in the present invention exists in the liquid state in the adsorbent of the present invention, and it is considered that it is a solvent rather than a humectant and improves the reaction even at low humidity.

  The number average molecular weight of PEG is important to be 62 to 600, preferably 180 to 330, and more preferably 180 to 210. The molecular weight 62 is the molecular weight of ethylene glycol, and is the minimum molecular weight of PEG employed in the present invention. That is, the PEG employed in the present invention includes ethylene glycol. Moreover, since the flash point becomes 150 ° C. or more by setting it to 180 or more, safety and workability are improved. Moreover, by setting it as 600 or less, a liquid state is maintained at normal temperature and PEG can work as a solvent. Furthermore, by setting it as 330 or less, since melting | fusing point will be less than 273K, it can maintain a liquid state also in environments, such as below freezing point, and can work as a solvent. Further, by setting it to 210 or less, the melting point becomes −50 ° C. or less, so that the liquid state can be maintained even in an extremely cold environment and it can function as a solvent.

  As a ratio of PEG, an amine compound, and a porous body in the adsorbent of the present invention, the amine compound is preferably 10 to 1000 parts by mass, more preferably 100 to 300 parts by mass with respect to 100 parts by mass of PEG. Moreover, 10-1000 mass parts is preferable with respect to 100 mass parts of PEG, More preferably, it is 100-300 mass parts. By setting it within this range, the initial efficiency and adsorption capacity as an adsorbent can be sufficiently obtained.

  The adsorbent of the present invention preferably has an acid catalyst. When the acid catalyst shares an electron with the carbonyl carbon of the aldehyde, the electrophilicity of the carbonyl carbon of the aldehyde can be increased, and the chemical adsorption ability of the compound having an amino group to the aldehyde can be improved.

Examples of the acid of the acid catalyst include Bronsted acid which is a proton donor and Lewis acid which is an electron pair acceptor. Examples of Lewis acids include hydroxides or oxides such as silicon, aluminum, titanium, zirconium, tungsten, molybdenum, tin, and iron, graphite, ion exchange resins, and the like, sulfate groups, antimony pentafluoride, five Tantalum fluoride, boron trifluoride or the like attached or supported, zirconium oxide (ZrO ₂ ), stannic oxide (SnO ₂ ), titania (TiO ₂ ), ferric oxide (Fe ₃ O ₃ ), it can be mentioned tungsten oxide (WO _3), or the like.

  The adsorbent of the present invention is suitable for adsorption of aldehydes. Examples of aldehydes include aliphatic aldehydes, aromatic aldehydes, and unsaturated aldehydes. In particular, the present invention is effective for lower aliphatic aldehydes that have low reactivity and are difficult to remove under dynamic conditions.

  Examples of lower aliphatic aldehydes include formaldehyde, acetaldehyde, and propionaldehyde.

The adsorbent of the present invention preferably has an initial adsorption efficiency of acetaldehyde gas of 20% or more at an absolute humidity of 2 g / m ³ . In such an environment, since the humidity is low, there is almost no effect even if a commonly used humectant is used.

  The adsorbent of the present invention preferably has an initial adsorption efficiency of acetaldehyde gas of 20% or more at an absolute temperature of 270K. Absolute temperature 270K is a state where water freezes, and water cannot act as a solvent. Therefore, it is the range where the moisturizing agent cannot act.

  Next, the filter medium of the present invention comprises fibers carrying the adsorbent of the present invention.

  As the fibers, natural fibers, synthetic fibers, inorganic fibers such as glass fibers and metal fibers can be used, and among them, synthetic fibers made of a thermoplastic resin excellent in strength, workability and the like are preferable. Examples of the thermoplastic resin that forms the synthetic fiber include polyester, polyamide, polyolefin, acrylic, vinylon, polystyrene, polyvinyl chloride, polyvinylidene chloride, polylactic acid, and the like, which can be selected depending on the application. Moreover, you may use combining multiple types.

  The fibers employed in the present invention preferably have an atypical cross-sectional shape or have a large number of holes and slits on the fiber surface. By doing so, the surface area of a fiber can be enlarged and the support property with respect to a porous body, an adsorbent, etc. can be improved. The irregular cross-sectional shape refers to a cross-sectional shape other than a circle, and examples thereof include a flat shape, a substantially polygonal shape, and a wedge shape. A fiber having a modified cross-sectional shape can be obtained by spinning using a die having a modified hole. Also, fibers having a large number of holes and slits on the fiber surface can be obtained by alloying and spinning two or more types of polymers having different solubility in the solvent, and dissolving and removing the higher solubility polymer with the solvent. Can do.

  The fiber diameter of the fiber employed in the present invention may be selected according to the target air permeability and dust collection performance in the application in which the fiber sheet is used as an air filter, preferably 1 to 1000 μm, more preferably 5 ˜100 μm. By setting the thickness to 1 μm or more, it is possible to prevent the adsorbent from being clogged on the fiber sheet surface and to prevent the air permeability from being lowered. Moreover, by setting it as 1000 micrometers or less, the fall of the supporting capability by the reduction | decrease of a fiber surface area and the fall of contact efficiency with process air can be prevented.

  The filter medium constituted by the fibers employed in the present invention is a fiber structure having air permeability, and examples thereof include cotton-like materials, knitted fabrics, nonwoven fabrics, and papers. By adopting such a structure, it is possible to increase the surface area while ensuring air permeability. Among them, the nonwoven fabric can be particularly preferably used because it does not have a large pore size at the intersection of the fibers unlike the woven fabric, and any portion is uniform and has a small pore size.

  As the form of the nonwoven fabric, any one of a chemical bonding method, a thermal bond method, a needle punch method, a spun lace method, an air lay method, a spun bond method, a melt blow method, a flash spinning method, a paper making method, or a combination of these methods. It is preferable that it is a nonwoven fabric obtained.

The basis weight of the filter medium is preferably 10 to 500 g / m ² , more preferably 30 to 200 g / m ² . By setting the basis weight of the filter medium to 10 g / m ² or more, sufficient strength to withstand the processing for supporting the adsorbent can be obtained, and the rigidity necessary to maintain the filter structure when air is aerated is obtained. It is done. Further, by setting the basis weight to 200 g / m ² or less, the adsorbent can be uniformly supported up to the inside of the filter medium, and the handleability at the time of secondary processing into a pleated shape or a honeycomb shape is excellent.

  The filter medium of the present invention preferably has a heat-adhesive component and a resin binder in terms of shape retention, strength improvement, dimensional stability, and the like.

  The filter medium of the present invention is preferably formed by further laminating a different filter medium on the filter medium carrying the adsorbent of the present invention. For example, in use as a direct flow filter, if a bulky and coarse nonwoven fabric sheet is laminated on the upstream side, the amount of dust retained is improved and the life can be extended. If a nonwoven fabric sheet made of ultrafine fibers is laminated on the downstream side, high collection efficiency can be achieved.

  Furthermore, it is still more preferable if the nonwoven fabric sheet which consists of this ultrafine fiber is electret-treated. By performing the electret treatment, it becomes possible to collect submicron-size and nano-size fine dust that is difficult to remove normally by electrostatic force.

  Examples of the material constituting the electret nonwoven fabric include polyolefin resins such as polypropylene, polyethylene, polystyrene, polybutylene terephthalate, and polytetrafluoroethylene, aromatic polyester resins such as polyethylene terephthalate, and synthetic polymer materials such as polycarbonate resins. Those having high electrical resistivity are preferred.

  As a method for producing the filter medium of the present invention, it is preferable that the fiber is immersed in a liquid in which a porous body, an amine compound, and PEG are mixed and dispersed, and further dried. By this method, the amount of chemicals attached can be freely adjusted. On the other hand, when an amine compound and PEG previously attached to a porous material are mixed in an aqueous solution and supported on a filter medium, the amine compound and PEG attached to the porous material are eluted in the solution. It will be diluted.

  Further, for example, an aqueous solution in which a porous material, an amine compound, and PEG are mixed may be applied to the filter medium by a coating process or sprayed by a spray process.

  Alternatively, after fixing the porous body to the surface of the filter medium, an aqueous solution in which an amine compound and PEG are mixed may be attached by dipping or spraying.

  Further, as a method for applying the porous body to the fiber surface, the porous body may be directly crystallized to form a film on the fiber surface.

  Further, as a method for applying the porous body to the fiber surface, the porous body may be arranged on the fiber surface at the stage of spinning. Specifically, for example, in the core-sheath composite spinning of synthetic fiber, the porous body can be unevenly distributed near the surface of the core-sheath composite by blending a large amount of the porous body in the sheath component. In this method, it is also preferable to remove an appropriate amount of the resin component on the surface by chemical or physical treatment in order to expose the porous body on the surface.

  The amount of the adsorbent with respect to the filter medium is preferably 5 to 60% by mass. By setting it to 5 mass% or more, sufficient performance can be exhibited, and by setting it to 60 mass% or less, it is possible to prevent a significant increase in pressure loss of the filter medium.

  It is also preferable to subject the filter medium to non-halogen flame retardant processing.

  Non-halogen flame retardants include nitrogen flame retardants, phosphorus flame retardants, and phosphorus-nitrogen flame retardants.

  Examples of nitrogen-based flame retardants include aliphatic amine compounds, aromatic amine compounds, nitrogen-containing heterocyclic compounds, aliphatic amides, aromatic amides, melamine compounds, urea, thiourea and the like.

  Examples of phosphorus-based flame retardants include phosphorus alone such as red phosphorus, phosphates such as calcium phosphate and titanium phosphate, phosphate esters such as tributyl phosphate and triphenyl phosphate, polyphosphoric acid and polyphosphoric acid such as calcium polyphosphate. List acid salts, polyphosphoric acid esters such as poly (diphenylphosphoric acid), phosphine oxides such as triphenylphosphine oxide, phosphoranes such as phenylphosphorane, phosphonic acids such as diphenylphosphonic acid, phosphine sulfide, etc. Can do.

  Examples of the phosphorus-nitrogen flame retardant include ammonium phosphate, ethylenediamine phosphate, melamine phosphate, ammonium polyphosphate, ethylenediamine polyphosphate, and the like.

  Among non-halogen flame retardants, nitrogen and phosphorus-nitrogen flame retardants in particular have a high flame retardant effect, and the amount of flame retardant can be reduced as compared with phosphorus flame retardants. Nitrogen-based and phosphorus-nitrogen-based flame retardants are considered to have a high flame retardant effect because ammonia gas or the like is generated during combustion and oxygen can be blocked.

  A non-halogen flame retardant may be used individually by 1 type, and may use 2 or more types together.

  The filter medium of the present invention can be suitably used for air filter applications. That is, the air filter of the present invention uses the filter medium of the present invention. In particular, a cabin filter for introducing outside air for automobiles used in various environments where there is a need to remove acetaldehyde in exhaust gas and a filter for printers used under low humidity are suitable.

  The shape of the air filter of the present invention may be used in the form of a plane as it is, but it is preferable to adopt a pleat type or a honeycomb type. When using the pleat type as a direct flow type filter, and when using the honeycomb type as a parallel flow type filter, the contact area of the processing air can be increased to improve the collection efficiency and simultaneously reduce the low pressure loss. it can.

[Measuring method]
(1) Measuring method of BET specific surface area and total pore volume About 100 mg of a porous material was sampled and weighed after vacuum drying at 120 ° C. for 12 hours. Using an automatic specific surface area device manufactured by Micromeritics, Inc., trade name Gemini 2375, the adsorption amount of nitrogen gas at the boiling point of liquid nitrogen (-195.8 ° C.) is gradually increased in the range of relative pressure of 0.02 to 0.95. The sample was measured at 40 points while increasing the temperature to obtain an adsorption isotherm of the sample. The results at a relative pressure of 0.02 to 0.15 were BET-plotted to determine the BET specific surface area (m ² / g) per mass. Further, the total pore volume (ml / g) was calculated from the result at a relative pressure of 0.95.

(2) Initial adsorption efficiency of acetaldehyde A flat filter medium was attached to an experimental duct, and air under the following three conditions was blown at a speed of 0.2 m / sec for each test. Further, from the upstream side, acetaldehyde was added to the upstream concentration of 20 volppm with a standard gas cylinder, air was sampled on the upstream side and downstream side of the fiber sheet, and each acetaldehyde concentration was determined using an infrared absorption type continuous monitor. Measured over time, the adsorption efficiency after 5 minutes was defined as the initial removal efficiency of acetaldehyde.
Condition 1: Absolute temperature 300K, Absolute humidity 2g / m ³
Condition 2: absolute temperature 300K, absolute humidity 14g / m ³
Condition 3: Absolute temperature 270 K, absolute humidity 2 g / m ³ .

(3) Temperature and humidity dependence of initial adsorption efficiency of acetaldehyde From the measurement result of (2) above, temperature and humidity dependence was evaluated according to the following criteria.
A: The difference between the maximum and minimum initial adsorption efficiency under conditions 1 to 3 is less than 10%.
B: The difference between the maximum and minimum initial adsorption efficiency under conditions 1 to 3 is less than 30%.
C: The difference between the maximum and minimum initial adsorption efficiency under conditions 1 to 3 is 30% or more.

(4) Comprehensive evaluation From the results of (2) and (3) above, comprehensive evaluation was performed according to the following criteria.
A: Temperature and humidity dependency evaluation is A, and initial adsorption efficiency is 30% or more under each condition.
B: Temperature and humidity dependency evaluation is A or B, and initial adsorption efficiency under each condition is 10% or more.
C: Temperature / humidity dependency evaluation is A or B and does not correspond to A or B of this evaluation standard.
D: Other than A to C in this evaluation standard.

[Example 1]
(Porous body)
As the porous body, porous silica (“Silicia” 250N manufactured by Fuji Silysia) having a pore volume of 1.80 ml / g and a specific surface area of 300 m ² / g was used.

(Amine compound)
As the amine compound, a mixture of adipic acid dihydrazide (manufactured by Nippon Kasei Co., Ltd.) and ethylene urea (manufactured by Kanto Chemical Co., Ltd.) at a mass ratio of 2: 1 was used.

(Functional agent)
As the functional agent, PEG having a number average molecular weight of 190 to 210 (“polyethylene glycol 200” manufactured by Nacalai Tesque) was used.

(Fiber sheet)
As the fiber sheet, 16.5% by mass of vinylon having a single fiber fineness of 1.5 dtex, 22% by mass of vinylon having a single fiber fineness of 7.1 dtex, 16.5% by mass of polyethylene terephthalate having a single fiber fineness of 2.0 dtex, and a phosphorus flame retardant A nonwoven fabric having a basis weight of 70 g / m ² composed of 45% by mass of an acrylic resin binder contained was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

[Example 2]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
As the functional agent, PEG having a number average molecular weight of 380 to 420 (“polyethylene glycol 400” manufactured by Nacalai Tesque) was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

[Example 3]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
As the amine compound, adipic acid dihydrazide (Nippon Kasei Co., Ltd.) was used.

(Functional agent)
The same one as used in Example 1 was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 300 parts by mass of the amine compound and 150 parts by mass of the porous material were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 110 g / m ² .

[Example 4]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
As the amine compound, ethylene urea (manufactured by Kanto Chemical Co., Inc.) was used.

(Functional agent)
The same one as used in Example 1 was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 150 parts by mass of the amine compound and 150 parts by mass of the porous material were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 100 g / m ² .

[Example 5]
(Porous body)
As the porous body, porous silica (“Silicia” 770 manufactured by Fuji Silysia) having a pore volume of 0.44 ml / g and a specific surface area of 700 m ² / g was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
The same one as used in Example 1 was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

[Example 6]
(Porous body)
As the porous body, activated carbon (“Carborafine” manufactured by Nippon Enviro Chemicals) having a pore volume of 1.0 ml / g and a specific surface area of 1430 m ² / g was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
The same one as used in Example 1 was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

[Comparative Example 1]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
No functional agent was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

[Comparative Example 2]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
As the functional agent, PEG having a number average molecular weight of 950 to 1050 (“polyethylene glycol # 1000” manufactured by Nacalai Tesque) was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

[Comparative Example 3]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
As the functional agent, lithium chloride manufactured by Nacalai Tesque was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² . .

[Comparative Example 4]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
As the functional agent, activated alumina manufactured by Mizusawa Chemical Co., Ltd. was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

[Comparative Example 5]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
As the functional agent, 3A zeolite manufactured by Mizusawa Chemical Co., Ltd. was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

[Comparative Example 6]
(Porous body)
The same one as used in Example 1 was used.

(Amine compound)
The same one as used in Example 1 was used.

(Functional agent)
As the functional agent, 13X zeolite manufactured by Mizusawa Chemical Co., Ltd. was used.

(Fiber sheet)
The same one as used in Example 1 was used.

(Filter material)
The fiber sheet was impregnated in an aqueous solution in which 100 parts by mass of the functional agent, 200 parts by mass of the amine compound and 150 parts by mass of the porous body were uniformly dispersed, and dried to obtain a filter medium having a basis weight of 105 g / m ² .

  The filter medium of the present invention is an air filter for purifying air in a vehicle interior of an automobile, a railway vehicle or the like, a filter for an air cleaner used in a healthy house, a pet-compatible apartment, an elderly entrance facility, a hospital, an office, etc. It is preferably used as an air filter medium for home and commercial printer filters, air conditioner filters, OA equipment intake / exhaust filters, building air conditioning filters, industrial clean room filters, and the like.

It is a schematic perspective view of the air filter which shows one Embodiment of this invention. It is a schematic perspective view of the air filter which shows one Embodiment of this invention.

Explanation of symbols

1 Air filter media (pleat type)
2 Air filter media (honeycomb type)
3 Frame

Claims (8)

An adsorbent characterized in that the porous body carries an amine compound and polyethylene glycol having a number average molecular weight of 62 to 600. The adsorbent according to claim 1, wherein the total pore volume of the porous body is 0.6 ml / g or more. The adsorbent according to claim 1 or 2, wherein the amine compound is an acid hydrazide. The adsorbent according to any one of claims 1 to 3, wherein the polyethylene glycol has a number average molecular weight of 180 to 330. The adsorbent according to claim 1, wherein the initial adsorption efficiency of acetaldehyde gas at an absolute humidity of 2 g / m ³ is 20% or more. The adsorbent according to any one of claims 1 to 5, wherein the initial adsorption efficiency of acetaldehyde gas at an absolute temperature of 270K is 20% or more. A filter medium comprising fibers carrying the adsorbent according to claim 1. An air filter using the filter medium according to claim 7.

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