Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L9/00—Disinfection, sterilisation or deodorisation of air
  • A61L9/01—Deodorant compositions
  • A61L9/014—Deodorant compositions containing sorbent material, e.g. activated carbon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D39/00—Filtering material for liquid or gaseous fluids
  • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
  • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
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  • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
  • B01D39/086—Filter cloth, i.e. woven, knitted or interlaced material of inorganic material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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  • B01D39/14—Other self-supporting filtering material ; Other filtering material
  • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
  • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
  • B01D39/1615—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of natural origin
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  • B01D39/14—Other self-supporting filtering material ; Other filtering material
  • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
  • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
  • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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  • B01D39/00—Filtering material for liquid or gaseous fluids
  • B01D39/14—Other self-supporting filtering material ; Other filtering material
  • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
  • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
  • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
  • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/0001—Making filtering elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
  • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
  • B01D53/0407—Constructional details of adsorbing systems
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
  • B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
  • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
  • B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
  • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
  • B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
  • B01J20/28035—Membrane, sheet, cloth, pad, lamellar or mat with more than one layer, e.g. laminates, separated sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/30—Processes for preparing, regenerating, or reactivating
  • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
  • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
  • B01J20/3204—Inorganic carriers, supports or substrates
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/30—Processes for preparing, regenerating, or reactivating
  • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
  • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
  • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
  • B01J20/3244—Non-macromolecular compounds
  • B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
  • B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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  • B01J20/30—Processes for preparing, regenerating, or reactivating
  • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
  • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
  • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
  • B01J20/3244—Non-macromolecular compounds
  • B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
  • B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
  • B01J20/3251—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such comprising at least two different types of heteroatoms selected from nitrogen, oxygen or sulphur
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
  • A61L2209/10—Apparatus features
  • A61L2209/14—Filtering means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
  • B01D2239/04—Additives and treatments of the filtering material
  • B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
  • B01D2239/04—Additives and treatments of the filtering material
  • B01D2239/0435—Electret
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
  • B01D2239/04—Additives and treatments of the filtering material
  • B01D2239/0457—Specific fire retardant or heat resistant properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
  • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
  • B01D2239/065—More than one layer present in the filtering material
  • B01D2239/0681—The layers being joined by gluing
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B01D2239/08—Special characteristics of binders
  • B01D2239/086—Binders between particles or fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B01D2239/12—Special parameters characterising the filtering material
  • B01D2239/1233—Fibre diameter
• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
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  • B01D2275/30—Porosity of filtering material

Definitions

• the present invention relates to an adsorbent, a filter medium and an air filter.
• Acetaldehyde is a typical malodorous component contained in cigarette smoke and automobile exhaust gas, and has a low odor threshold, and it is easy to perceive an odor even at a low concentration.
• activated carbon having a large surface area and pore volume is generally used for removing malodorous components in air, but the amount of equilibrium adsorption of lower aliphatic aldehyde to activated carbon is significantly smaller than that of other malodorous components. , Does not have practical performance.
• an acid hydrazide compound which is an amine compound, and a compound having a thiol group as a functional group are attached to silica gel to suppress the oxidation of amine compounds and suppress the deterioration of aldehyde removal performance over time.
• an object of the present invention is to provide an adsorbent, a filter medium, and an air filter which are excellent in aldehyde removal performance and whose deterioration with time is small.
• the present invention is an adsorbent characterized in that at least an amine compound and a compound having a sulfide group as a functional group are supported on an inorganic porous body.
• the present invention is a filter medium characterized by using the adsorbent of the present invention.
• the present invention is an air filter characterized by using the filter medium of the present invention.
• the present invention is a method for producing an adsorbent, which comprises dissolving a compound having a sulfide group as a functional group and an amine-based compound in water, adhering the compound to an inorganic porous body, and drying the compound.
• the present invention provides an adsorbent, a filter medium and an air filter having excellent aldehyde removal performance and little deterioration over time by adhering at least an amine compound and a compound having a sulfide group as a functional group to an inorganic porous body. be able to.
• the adsorbent of the present invention has an inorganic porous body.
• a surface area that can be contacted with the treated air can be obtained, and a drug described later can be supported in a sufficient amount, so that the aldehyde removal efficiency can be improved.
• the inorganic porous body adopted in the present invention one selected from the group consisting of activated carbon, zeolite, activated alumina, silica gel, activated clay, aluminum silicate, and magnesium silicate can be preferably used. Two or more species selected from the group can also be used in combination.
• the porous silica is excellent in that it does not react with the amine-based compound described later and can suppress the deterioration of the amine-based compound carried on the porous silica.
• Inorganic porous materials are also porous in that porous silica has strong hydrophilicity, has high affinity with water-soluble agents such as amine compounds, and can improve the adsorption performance of aldehydes as adsorbents. It is preferably quality silica.
• the inorganic porous body used in the present invention is preferably in the form of particles. If it is in the form of particles, it is possible to effectively achieve both performance and economy.
• the fibrous inorganic porous body has an increased specific surface area, higher contact efficiency with the target gas, and better performance (removal efficiency), but is expensive.
• the average particle size of the inorganic porous body is preferably 1 ⁇ m or more and 1000 ⁇ m or less.
• the average particle size referred to here refers to the mass average particle size specified in the JIS-K1474 (2014) activated carbon test method.
• the average pore diameter of the inorganic porous body in the present invention is preferably 4 nm or more and 50 nm or less.
• the average pore diameter in the present invention means the peak diameter obtained by the BJH method, and more specifically, it is obtained by using the adsorption side isotherm obtained by the nitrogen adsorption method at 77 kelvin (liquid nitrogen temperature).
• the average pore diameter of the inorganic porous body is set to 4 nm or more, more preferably 5 nm or more, it is possible to promote the entry of the amine compound or VOC gas into the pores of the granular inorganic porous body.
• the specific surface area of the inorganic porous body used in the present invention is preferably 30 m 2 / g or more and 1000 m 2 / g or less in terms of BET specific surface area.
• the specific surface area of the inorganic porous body is preferably 30 m 2 / g or more, more preferably 50 m 2 / g or more, the effective area as a reaction field of the amine-based compound carried by the inorganic porous body is improved and adsorption is achieved. The reaction rate between the agent and the VOC gas to be removed is improved.
• the BET specific surface area of the inorganic porous body is set to 1000 m 2 / g or less, it is possible to suppress the decrease in handleability due to the decrease in the mechanical strength of the inorganic porous body, and the VOC gas leading to secondary odor. It is possible to suppress unintentional adsorption to the adsorbent.
• the adsorbent of the present invention has an amine compound supported on an inorganic porous body. Aldehyde-based odorants can be effectively adsorbed by the amine-based compound.
• amine compounds examples include aniline having an amino group, acid hydrazides, benzylamine, naphthylamine, cyclohexylamine, (iso) propanolamine, ethanolamine, diethylenetriamine, triethylenetetramine, and styrenemethacrylic acid as primary amine compounds.
• Compounds such as ethylamine and amine styrene acrylate, monomers, oligomers, polymers, and derivatives containing amino groups derived from these compounds can be used.
• Amine compounds other than the primary amine compounds include 3,5-dimethylpyrazole, 3-methyl-5-pyrazolone, 1,2,3-triazole, 1,2,4. -Triazole, 3-n-butyl-1,2,4-triazole, 3,5-dimethyl-1,2,4-triazole, 3,5-di-n-butyl-1,2,4-triazole, etc.
• secondary amine compounds of alkyls such as azoles, azines, dipropylamine and dibutylamine
• cyclic secondary amine compounds such as piperidine, piperazine and pyrrolidine are included.
• the secondary amine compound has an amide bond or a urea bond in order to prevent the re-release of aldehydes.
• 1,3-dimethylurea and ethyleneurea are more preferable from the viewpoints of high safety, no odor of amine odor, water solubility and good processability.
• tertiary amine compound examples include vinylbenzyldimethylamine, vinylbenzyldiethylamine, diethylamine styreneacrylic acid, diethylamine styrene methacrylate, dimethylamine styreneacrylic acid, dimethylamine styrenemethacrylate, ethyldimethylamine styrenemethacrylate, and styreneacrylic acid.
• Examples thereof include compounds such as ethyldimethylamine, ethyldiethylamine styrene methacrylate, ethyldiethylamine styrene acrylate, and triethylamine, monomers, oligomers, polymers, and tertiary amine compounds derived from these compounds.
• primary amine compounds having an amino group are preferable, and acid hydrazides are more preferable, among these, because the ability of the adsorbent to suppress the desorption of high boiling point aldehydes becomes more excellent.
• Acid hydrazides are compounds having an acid hydrazide group represented by -CO - NHNH2 derived from a carboxylic acid and hydrazine, and a nitrogen atom having an unshared electron pair is further bonded to the ⁇ -position at the hydrazide terminal.
• the nucleophilic reactivity is significantly improved. It is considered that this unshared electron pair attacks the carbonyl carbon atom of the aldehyde compound in a nucleophilic reaction and immobilizes the aldehyde compound as a hydrazine derivative, whereby the adsorption performance of the aldehyde compound can be exhibited.
• acetaldehyde has an electron-donating alkyl group at the ⁇ -position of the carbonyl carbon, so that the electrophile of the carbonyl carbon is low and it is difficult to chemically adsorb.
• the acid preferably used in the adsorbent used in the present invention.
• hydrazides have high electrophilic reactivity, and therefore exhibit good chemical adsorption performance even for acetaldehyde.
• the acid hydrazides are preferably water-soluble acid hydrazides from the viewpoint of easy support processing on the inorganic porous body.
• water-soluble acid hydrazides refer to acid hydrazides that dissolve in 0.5% by mass or more with respect to water (25 ° C.).
• Examples of the acid hydrazide compound used in the present invention include form hydrazide, acetohydrazide, propionate hydrazide and benzoic acid hydrazide as acid monohydrazides having one acid hydrazide group in the molecule.
• As acid dihydrazide having a hydrazide group carbodihydrazide, glutamate dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, dodecanedioic acid dihydrazide, fumaric acid dihydrazide, maleic acid dihydrazide and terephthalic acid dihydrazide, etc., and 3 or more groups in the molecule.
• Examples of the acid polyhydrazide having the above include polyacrylic acid hydrazide.
• carbodihydrazide, succinic acid dihydrazide, and adipic acid dihydrazide are preferably used from the viewpoint of adsorption performance. Further, by using adipic acid dihydrazide, an excellent effect is exhibited particularly on the adsorption capacity of acetaldehyde.
• the amount of the amine compound supported is preferably 0.5 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the inorganic porous body.
• the loading amount of the amine compound By setting the loading amount of the amine compound to 0.5 parts by mass or more, more preferably 2.0 parts by mass or more, the effect of improving the removal efficiency of aldehydes and the adsorption capacity of aldehydes can be obtained.
• the carrying amount of the amine compound is 30 parts by mass or less, more preferably 20 parts by mass or less, the amine compound crystallizes and closes the pores of the inorganic porous body, and the adsorption rate decreases. At the same time, it is possible to suppress the cause of powder falling.
• a compound having a sulfide group (—S—) as a functional group (hereinafter, also referred to as “sulfide compound”) is also supported on the inorganic porous body.
• sulfide compound a compound having a sulfide group (—S—) as a functional group
• metals are present on the pore surface of the inorganic porous body, and the fact that the decomposition reaction of the amine compound is promoted by the catalytic action of the metal is considered to be the main factor of the deterioration of the removal performance of aldehydes over time.
• the amine-based compound is an acid hydrazide compound.
• the sulfide group has reactivity with a metal, it is considered that the above-mentioned decomposition reaction can be suppressed.
• the support of the sulfide compound has an effect of preventing the oxidative decomposition of the amine compound having excellent reactivity with aldehydes. Be done.
• Examples of the sulfide compound used in the present invention include methionines in addition to dimethyl sulfide and diethyl sulfide.
• Specific examples of the methionines include L-methionine, D-methionine, D, L-methionine, salts thereof, and esters of carboxyl groups and amides of carboxyl groups contained in these methionsines.
• methionine derivatives and the like can be mentioned.
• methionine is preferable because it is inexpensive and has excellent heat resistance.
• L-methionine is preferably used inexpensively because it is present in a large proportion in nature.
• the amount of the sulfide compound supported is preferably 0.5 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the inorganic porous body.
• the loading amount of the sulfide compound is preferably 0.5 parts by mass or more, more preferably 1.0 part by mass or more, it is possible to sufficiently react with the metal component adhering to the pore surface.
• the amount is set to 20 parts by mass or less, more preferably 10 parts by mass or less, it is possible to prevent the pores of the inorganic porous body from being blocked and the adsorption rate from being lowered.
• the amine-based compound and the sulfide compound are dissolved in water, the obtained aqueous solution is impregnated on the inorganic porous body, and then the inorganic porous body is adhered. There is a method of drying the compound.
• the gas adsorbent of the present invention preferably has a pH (hydrogen ion index) of 3.0 or more and 7.5 or less when 5 g of the gas adsorbent is dispersed in 100 g of water at 25 ° C. By doing so, the removal performance of aldehydes is improved.
• a pH hydrogen ion index
• the body is protonated in an acidic reaction field and easily dehydrated, and the immobilization reaction to the derivative proceeds sufficiently.
• the unshared electron pair of the amine compound sufficiently maintains the activity of nucleophilically attacking the carbonyl carbon atom of the aldehydes. can do.
• the pH of the adsorbent can be adjusted by supporting at least one acid (hereinafter, also referred to as "organic / inorganic acid”) selected from the group consisting of organic acids and inorganic acids on the adsorbent. ..
• the organic / inorganic acid is preferably an acid that does not generate an odor by itself.
• organic acid examples include adipic acid, succinic anhydride, sulfanic acid, malic acid and citric acid, amino acids and the like, and adipic acid dihydrazide as an amine compound is impregnated into an inorganic porous body as an aqueous dispersion.
• adipic acid can be preferably adopted.
• Adipic acid is preferably used because it keeps the balance of the dispersion of adipic acid dihydrazide stable and does not generate odor or develop hygroscopicity.
• Phosphoric acid is preferably used because it can form a sparingly soluble salt with a dissolved heavy metal such as iron that promotes the oxidation of a sulfide group to insolubilize the heavy metal.
• the organic / inorganic acid may also be mixed and added to the aqueous dispersion. preferable.
• the filter medium of the present invention is characterized by using the adsorbent of the present invention.
• the filter medium of the present invention is preferably formed by sandwiching the adsorbent of the present invention with a breathable sheet-like material (hereinafter, also referred to as "breathable sheet-like material").
• a fiber structure is preferable, and specific examples thereof include cotton-like material, knitted fabric, non-woven fabric, paper and other three-dimensional net-like material. Further, these laminated bodies can also be used. By adopting a structure like these, it is possible to take a large surface area while ensuring air permeability. From the viewpoint of using as an air filter, a non-woven fabric is preferably used.
• the fiber forming the breathable sheet-like material examples include natural fiber, synthetic fiber, and inorganic fiber such as glass fiber and metal fiber, and among them, synthetic fiber made of a thermoplastic resin capable of melt spinning is preferably used.
• the thermoplastic resin forming the synthetic fiber examples include polyester, polyamide, polyolefin, acrylic, vinylon (polyvinyl alcohol), polystyrene, polyvinyl chloride, polyvinylidene chloride, polylactic acid, etc. You can choose according to your needs. In addition, a plurality of types can be used in combination.
• the fiber diameter of the fibers constituting the breathable sheet can be selected according to the target breathability and dust collection performance in the application used as an air filter, but is preferably 1 ⁇ m or more and 2000 ⁇ m or less.
• the fiber diameter is preferably 1 ⁇ m or more, more preferably 5 ⁇ m or more, it is possible to prevent the adsorbent from clogging on the surface of the fiber structure and prevent the air permeability from being lowered.
• the fiber diameter to 2000 ⁇ m or less, more preferably 100 ⁇ m or less, it is possible to prevent a decrease in the carrying capacity of the adsorbent due to a decrease in the surface area of the fiber and a decrease in the contact efficiency with the treated air.
• the basis weight of the breathable sheet-like material is preferably 10 g / m 2 or more and 500 g / m 2 or less.
• the basis weight is preferably 10 g / m 2 or more and 500 g / m 2 or less.
• At least one of the breathable sheet-like materials is electret-treated.
• the electret treatment makes it possible to collect submicron-sized and nano-sized fine dust that is normally difficult to remove by electrostatic force.
• Materials constituting such an electlet-treated breathable sheet include polyolefin resins such as polypropylene, polyethylene, polystyrene, polybutylene terephthalate and polytetrafluoroethylene, aromatic polyester resins such as polyethylene terephthalate, and materials.
• a material having a high electric resistance such as a polycarbonate resin is preferably used.
• the adsorbent is fixed to a breathable sheet-like material by a thermoplastic resin.
• the thermoplastic resin as the binder resin, the adsorbent can be firmly fixed to the breathable sheet-like material while preventing the adsorbent from being covered with the binder and deteriorating its function.
• thermoplastic resin for immobilizing the adsorbent of the present invention on a breathable sheet-like material a thermoplastic resin such as EVA-based, polyester-based, polyamide-based, and low-density polyethylene-based can be used.
• the amount of the adsorbent supported on the filter medium of the present invention is preferably 5 g / m 2 or more and 300 g / m 2 or less.
• the loading amount is preferably 5 g / m 2 or more, more preferably 10 g / m 2 or more, the effect of improving the removal efficiency of aldehydes and the adsorption capacity can be obtained.
• the loading amount is set to 300 g / m 2 or less, more preferably 200 g / m 2 or less, it is possible to prevent the adsorbent from clogging on the surface of the adsorbed sheet having air permeability and suppress the decrease in air permeability. be able to.
• the filter medium of the present invention can also support granular activated carbon separately from the adsorbent of the present invention. By supporting the granular activated carbon, it is possible to remove VOC gas other than aldehyde gas, and it is possible to adsorb and remove VOC gas in general.
• the air filter of the present invention is characterized by using the filter medium of the present invention.
• the shape it may be used as it is in a flat shape, but it is preferable to adopt a pleated type or a honeycomb type.
• the pleated type is used as a direct flow type filter and the honeycomb type is used as a parallel flow type filter, the contact area of the treated air is increased to improve the collection efficiency and reduce the low pressure at the same time. Can be done.
• the filter medium of the present invention is housed in a frame in terms of air processing efficiency and handleability.
• Adsorbent pH (hydrogen ion index) 5 g of the adsorbent was immersed in 100 g of pure water at a temperature of 25 ° C., the mixture was lightly stirred, and then left for 10 minutes, and the pH of the obtained aqueous solution was measured with a pH meter (Lacom Ecoscan pH 5). The measurement was performed three times, and the average value was adopted.
• Acetaldehyde removal performance A 12 cm x 12 cm flat filter medium is attached to a 10 cm x 10 cm experimental duct, and air with a temperature of 23 ° C and a humidity of 50% RH is applied to the duct at 0.2 m / sec. Blowed at speed. Further, from the upstream side, acetaldehyde (also referred to as C2H4O ) is added to an upstream concentration of 10 ppm by a standard gas cylinder, and air is sampled on the upstream side and the downstream side of the filter medium, and the infrared absorption type is continuous. Using a monitor, each acetaldehyde concentration was measured over time, and the removal efficiency was calculated by the following formula.
• Removal efficiency (%) [(C0-C) / C0] x 100
• C0 Acetaldehyde concentration on the upstream side (10 ppm)
• C Acetaldehyde concentration (ppm) on the downstream side
• the removal efficiency 100 seconds after the start of addition of acetaldehyde was defined as the initial removal efficiency. If the initial removal efficiency of acetaldehyde immediately after sample preparation was 40% or more, it was judged as acceptable.
• the rate of decrease in adsorption capacity by the aged deterioration test was calculated by the following formula.
• Decrease rate of adsorption capacity (%) [((adsorption capacity immediately after sample preparation)-(adsorption capacity after aging test)) / (adsorption capacity immediately after sample preparation)] ⁇ 100 If the rate of decrease in adsorption capacity by the aged deterioration test was 50% or less, it was evaluated as acceptable.
• the rate of decrease in adsorption capacity by the heat resistance test was calculated by the following formula.
• Decrease rate of adsorption capacity (%) [((adsorption capacity immediately after sample preparation)-(adsorption capacity after heat resistance test)) / (adsorption capacity immediately after sample preparation)] ⁇ 100 If the rate of decrease in adsorption capacity by the heat resistance test was 50% or less, it was evaluated as "excellent".
• Example 1 (Adsorbent A) (Inorganic porous body) As the inorganic porous body, porous silica (Fuji Silysia Chemical Ltd.) having an average particle diameter of 300 ⁇ m was used.
• Adipic acid dihydrazide (Otsuka Chemical Co., Ltd.) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of the sulfide compound in water and an inorganic porous body were mixed and dried to prepare an adsorbent A.
• the breathable sheet-like material located on the upstream side with respect to the air flow includes vinylon (polyvinyl alcohol) fiber 16.5% by mass with a single fiber fineness of 1.5 dtex and vinylon (polyvinyl alcohol) with a single fiber fineness of 7.1 dtex.
• a charged fiber sheet having a basis weight of 20 g / m 2 made of an electret-processed melt-blown non-woven fabric of polypropylene fiber was used.
• Heat fusion resin Low-density polyethylene (melting point 98-104 ° C. manufactured by Tokyo Ink Co., Ltd.) was used.
• the adsorbent and the heat-sealed resin are mixed so as to have a mass ratio of 2: 1 and stirred until uniform, which is sprayed on a breathable sheet-like material for the downstream side, and further.
• a filter medium A was prepared by covering it with a breathable sheet-like material for the upstream side from above and heat-pressing it.
• Example 2 (Adsorbent B) (Inorganic porous body) The same one used in Example 1 (Adsorbent A) was used.
• Example 1 The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of the sulfide compound in water and an inorganic porous body were mixed and dried to prepare an adsorbent B.
• the pH when 5 g of the adsorbent B was dispersed in 100 g of water was 6.4.
• Manufacturing of filter media The same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent B was used as the adsorbent.
• the filter medium B was produced in the same manner as in Example 1 except for the above.
• Example 3 (Adsorbent C) (Inorganic porous body) The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of the sulfide compound in water and an inorganic porous body were mixed and dried to prepare an adsorbent C.
• Example 2 Manufacturing of filter media
• the same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent C was used as the adsorbent.
• a filter medium C was produced in the same manner as in Example 1 except for the above.
• Example 4 (Adsorbent D) (Inorganic porous body) The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of the sulfide compound in water and an inorganic porous body were mixed and dried to prepare an adsorbent D.
• Example 2 Manufacturing of filter media
• the same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent D was used as the adsorbent.
• a filter medium D was produced in the same manner as in Example 1 except for the above.
• Example 5 (Adsorbent E) (Inorganic porous body) The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of the sulfide compound in water and an inorganic porous body were mixed and dried to prepare an adsorbent E.
• Example 2 Manufacturing of filter media
• the same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent E was used as the adsorbent.
• a filter medium E was produced in the same manner as in Example 1 except for the above.
• Example 6 (Adsorbent F) (Inorganic porous body) The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of the sulfide compound in water and an inorganic porous body were mixed and dried to prepare an adsorbent F.
• Example 2 Manufacturing of filter media
• the same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent F was used as the adsorbent.
• a filter medium F was produced in the same manner as in Example 1 except for the above.
• Example 1 The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of L-cysteine in water and an inorganic porous body were mixed and dried to prepare an adsorbent G.
• Example 2 Manufacturing of filter media
• the same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent G was used as the adsorbent.
• a filter medium G was produced in the same manner as in Example 1 except for the above.
• Example 2 (Adsorbent H) (Inorganic porous body) The same one used in Example 1 (Adsorbent A) was used.
• Example 1 The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of L- ⁇ -alanine in water and an inorganic porous body were mixed and dried to prepare an adsorbent H.
• Example 2 Manufacturing of filter media
• the same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent H was used as the adsorbent.
• the filter medium H was produced in the same manner as in Example 1 except for the above.
• Example 3 (Adsorbent I) (Inorganic porous body) The same one used in Example 1 (Adsorbent A) was used.
• Example 1 The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound and 2% by mass of succinic anhydride in water and an inorganic porous body were mixed and dried to prepare an adsorbent I.
• Example 2 Manufacturing of filter media
• the same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent I was used as the adsorbent.
• the filter medium I was produced in the same manner as in Example 1 except for the above.
• Example 4 (Adsorbent J) (Inorganic porous body) The same one used in Example 1 (Adsorbent A) was used.
• Example 1 The same one used in Example 1 (Adsorbent A) was used.
• aqueous solution prepared by dissolving 5% by mass of the amine compound in water and an inorganic porous body were mixed and dried to prepare an adsorbent J.
• the pH when 5 g of the adsorbent J was dispersed in 100 g of water was 6.5.
• Example 2 Manufacturing of filter media
• the same materials as those used in Example 1 were used for the breathable sheet-like material for the upstream side, the breathable sheet-like material for the downstream side, and the heat-sealing resin, and the adsorbent J was used as the adsorbent.
• a filter medium J was produced in the same manner as in Example 1 except for the above.
• Table 1 shows the acetaldehyde removal efficiency, the adsorption capacity, and the reduction rate of the adsorption capacity of Examples 1 to 6 and Comparative Examples 1 to 4.
• Acid Hydrazides are used as the amine compounds in Examples 1, 2, 4 and 5, all of them show higher values for the adsorption capacity of acetaldehyde immediately after sample preparation as compared with Examples 3 and 6. rice field.
• Examples 1 and 2 use adipic acid dihydrazide as the amine compound, the adsorption capacity of acetaldehyde immediately after sample preparation is 0.30 g / m 2 in each case as compared with Examples 3 to 6. As mentioned above, the initial removal efficiency was 50% or more, which was a particularly high value.
• the filter medium using the adsorbent according to the present invention is used in an air filter for purifying the air in the passenger compartment of an automobile or a railroad vehicle, a healthy house, a pet-friendly apartment, an elderly entrance facility, a hospital, an office, or the like. It is preferably used as an air filter filter medium for air purifier filters, air conditioner filters, intake / exhaust filters for OA equipment, building air conditioning filters, and industrial clean room filters.

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