Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D39/00—Filtering material for liquid or gaseous fluids
  • B01D39/14—Other self-supporting filtering material ; Other filtering 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D39/00—Filtering material for liquid or gaseous fluids
  • B01D39/14—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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D39/00—Filtering material for liquid or gaseous fluids
  • B01D39/14—Other self-supporting filtering material ; Other filtering material
  • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
  • B01D39/2055—Carbonaceous material
  • B01D39/2058—Carbonaceous material the material being particulate
  • B01D39/2062—Bonded, e.g. activated carbon blocks
• • 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
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
• • 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
• • 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
  • B01J20/26—Synthetic macromolecular compounds
• • 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
  • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
  • B32B5/30—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being formed of particles, e.g. chips, granules, powder

Definitions

• the present invention relates to a filter medium having deodorizing performance, and particularly to a filter medium having excellent deodorizing performance for polar gas components.
• Activated carbon cannot efficiently deodorize polar gases such as ammonia and aldehydes because it adsorbs malodorous components by physical adsorption. On the other hand, since these gases have a low threshold value, it is an issue to efficiently remove these gases in order to improve the comfort of the living environment.
• Activated carbon is generally used to remove non-polar gas, and it is known in previous studies that it is better to have a small pore diameter to suppress secondary odor.
• Patent Documents 1 and 2 As a method for efficiently removing gases such as aldehydes, a composite adsorbent in which silica gel carrying acid hydrazides is mixed with activated carbon has been proposed, and a filter medium using this composite adsorbent is known.
• Patent Documents 1 and 2 This adsorbent has excellent adsorption performance for low boiling point aldehydes, high boiling point aldehydes and hydrocarbon gases.
• the present invention has been made against the above-mentioned problems, and efficiently removes polar gases such as ammonia and aldehydes, and suppresses the secondary odor of these gases once adsorbed by the adsorbent.
• the subject is to provide a filter medium.
• the filter medium of the present invention for solving the above problems has at least two laminated non-woven fabrics, and is an inorganic porous body in which at least acid hydrazides are supported between at least one layer between the laminated non-woven fabrics. Contains acidic cation exchange resin.
• the filter medium of the present invention preferably satisfies any of the following (1) to (6).
• the acidic cation exchange resin is in the form of particles.
• the average particle size of the acidic cation exchange resin is 200 ⁇ m or less.
• Activated carbon is contained in at least one of the layers of the laminated non-woven fabric.
• the pore volume of the pores having a pore diameter of 0.4 nm or more and 2 nm or less calculated by the MP method is in the range of 0.40 cc / g or more and 0.55 cc / g or less.
• the ratio of the pore volume of the pores having a pore diameter of 0.4 nm or more and 2 nm or less to the pore volume of the pores having a pore diameter of 0.4 nm or more calculated by the MP method and the BJH method is 75. % Or more.
• the above-mentioned activated carbon is an alkali-impregnated activated carbon.
• Acetic acid, ammonia, and acetaldehyde gas which are designated as target gases for deodorizing performance in the air purifier standard JEMA1467, can be efficiently removed, and the secondary odor of these gases once adsorbed by the adsorbent can be suppressed.
• the filter medium of the present invention has at least two laminated non-woven fabrics, and is characterized by containing an inorganic porous body in which at least an amine compound is supported and an ion exchange resin between the layers of the two non-woven fabrics. ..
• the polar gas once adsorbed and separated from the inorganic porous body on which the amine compound is supported can be adsorbed by the ion exchange resin, and the secondary odor can be suppressed.
• the inorganic porous body used in the present invention is activated carbon, zeolite, activated alumina, silica gel, activated clay, aluminum silicate, or magnesium silicate.
• adsorbent used in the present invention two or more kinds selected from the group consisting of activated carbon, zeolite, activated alumina, silica gel, activated clay, aluminum silicate, and magnesium silicate can be used in combination.
• the amine-supported inorganic porous body in which an amine-based compound is supported on these inorganic porous bodies is said to be effective for aldehyde-based odorous substances.
• Examples of the amine compound supported on the inorganic porous body include aniline having an amino group, acid hydrazides, benzylamine, naphthylamine, cyclohexylamine, (iso) propanolamine, ethanolamine, and diethylenetriamine as primary amine compounds.
• Compounds such as triethylenetetramine, ethyl styrene methacrylate, amine styrene acrylate, monomers, oligomers, polymers, derivatives containing amino groups derived from these compounds, and the like can be used.
• Amine compounds other than primary amine compounds include ethylaniline, diethylamine, methylvinylamine, methylmethylamine styrene acrylate, vinylbenzylmethylamine, ethylmethylamine styrene methacrylate and the like. Examples thereof include compounds, monomers, oligomers, polymers, and secondary amine compounds derived from these compounds.
• tertiary amine compound examples include vinylbenzyldimethylamine, vinylbenzyldiethylamine, diethylamine styreneacrylic acid, diethylamine styrene methacrylate, dimethylamine styreneacrylic acid, dimethylamine styrenemethacrylate, ethyldimethylamine styrene methacrylate, and styreneacrylic acid.
• Examples thereof include compounds such as ethyldimethylamine, ethyldiethylamine styrene methacrylate, ethyldiethylamine styreneacrylate, and triethylamine, monomers, oligomers, polymers, and tertiary amine compounds derived from these compounds.
• a primary amine compound having an amino group is preferable, and acid hydrazides are more preferable, among these, because the desorption suppressing performance of the high boiling point aldehyde of the adsorbent becomes more excellent.
• silica gel does not react with acid hydrazides and can suppress the deterioration of acid hydrazides supported on silica gel.
• silica gel has strong hydrophilicity and is water-soluble such as acid hydrazides.
• the inorganic porous body is preferably silica gel because it has a high affinity with a drug and can improve the adsorption performance of the aldehyde of the adsorbent.
• 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 preferable because it is possible to 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 not effective in consideration of economy because of its high price.
• the average particle size of the inorganic porous body is preferably in the range of 50 to 1000 ⁇ m.
• the average particle size of the inorganic porous body is preferably 50 ⁇ m or more, more preferably 100 ⁇ m or more, because the property and processability are deteriorated.
• the average particle size of the inorganic porous body is preferably 1000 ⁇ m or less, and more preferably 600 ⁇ 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 material used in the present invention is preferably 40 to 500 angstroms.
• the average pore diameter of the inorganic porous body is more preferably 300 angstroms or less.
• the average pore diameter of the inorganic porous body is preferably 50 angstroms or more.
• the specific surface area of the inorganic porous body used in the present invention is preferably 30 to 1000 m 2 / g in terms of BET specific surface area.
• the specific surface area of the inorganic porous body is set to 30 m 2 / g or more, the effective area as a reaction field of the amine compound supported by the inorganic porous body is improved, and the adsorbent and the VOC gas to be removed are used. Reaction speed is improved.
• the BET specific surface area of the inorganic porous body is more preferably 50 m 2 / g or more.
• the BET specific surface area of the inorganic porous body is 1000 m 2 / g or less, it is possible to suppress a decrease in handleability due to a decrease in mechanical strength of the inorganic porous body, and a VOC gas leading to secondary odor can be suppressed. It is possible to suppress unintentional adsorption to the adsorbent.
• the inorganic porous body used in the present invention carries acid hydrazides as an amine compound for removing low boiling point aldehydes contained in VOC gas. Further, 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.).
• Acid hydrazides are compounds having an acid hydrazide group represented by -CO-NHNH 2 derived from a carboxylic acid and hydrazine, and a nitrogen atom having an unshared electron pair at the ⁇ -position at the hydrazide terminal. Is bound, which significantly improves the nucleophilic reactivity. This unshared electron pair reacts by nucleophilically attacking the carbonyl carbon atom of an aldehyde compound (aldehyde compound is a concept including low boiling point aldehyde and high boiling point aldehyde), and fixes the aldehyde compound as a hydrazine derivative. It is considered that the adsorption performance of the aldehyde compound can be exhibited by the conversion.
• 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 be chemically adsorbed.
• the acid hydrazide used in the gas adsorbent used in the present invention As mentioned above, since the class has high electrophilic reactivity, it exhibits good chemisorption performance even for acetaldehyde.
• acid hydrazides include those containing one or more selected from the group consisting of carbodihydrazide, glutamic acid dihydrazide, succinic acid dihydrazide, and adipic acid dihydrazide.
• adipic acid dihydrazide is particularly preferable because it has excellent adsorption performance for aldehyde compounds. Further, it is more preferable to use adipic acid dihydrazide and succinic acid dihydrazide in combination for the purpose of improving the adsorption performance of the aldehyde compound.
• the amount of the acid hydrazides used in the present invention is preferably 1 to 50 parts by mass with respect to 100 parts by mass of the inorganic porous body.
• the content of acid hydrazides is 1 part by mass or more, the adsorption performance of the aldehyde compound of the adsorbent can be further improved.
• the amount of acid hydrazides supported is more preferably 3 parts by mass or more.
• the method for supporting the acid hydrazides on the inorganic porous body is not particularly limited as long as it is a method that can obtain desired characteristics.
• the inorganic porous body is contained in an aqueous solution in which the acid hydrazides are dissolved.
• a method of supporting acid hydrazides on an inorganic porous body by adding and dispersing acid hydrazides, or an aqueous solution in which acid hydrazides are dissolved in a solvent is sprayed and applied to the inorganic porous body, and then this inorganic porous body is sprayed and applied. Examples include a method of drying the body.
• an appropriate solvent can be selected in consideration of the characteristics and workability of acid hydrazides.
• an aqueous solvent from the viewpoint of safety and workability, and it is more preferable to use pure water as the solvent.
• the inorganic porous body carrying the acid hydrazides used in the present invention preferably has a pH in the range of 3.0 to 7.5 when 5 g is dispersed in 100 g of water at 25 ° C.
• the pH is 7.5 or less, the intermediate produced from the reaction by the nucleophilic attack on the carbonyl carbon atom of the aldehyde compound of the unshared electron pair of acid hydrazides is protonated in the acidic reaction field. Therefore, it becomes easy to dehydrate, and the immobilization reaction of the intermediate to the derivative proceeds sufficiently.
• the pH is more preferably 6.5 or less.
• the unshared electron pair of acid hydrazides becomes more active in nucleophilically attacking the carbonyl carbon atom of the aldehyde compound, and the adsorption performance of the aldehyde compound of the adsorbent becomes higher. Becomes better.
• the pH was measured by immersing the inorganic porous body carrying acid hydrazides in pure water at 25 ° C. so as to be 5% by mass, stirring lightly, and then leaving it for 10 minutes, and measuring the pH of the liquid with a pH meter. To say.
• the pH of the inorganic porous body carrying acid hydrazides can be adjusted by adding an organic acid.
• an organic acid it is preferable to use an organic acid that does not generate an odor by itself and has low hygroscopicity.
• Specific examples of the organic acid as described above include adipic acid, sulfanic acid, malic acid, citric acid and the like, which may be appropriately selected according to the acid hydrazides used, and adipic acid is preferably adopted. be able to.
• an acidic cation exchange resin is used as an alternative to the organic acid. Acidic cation exchange resins are preferable because they do not generate their own odor or hygroscopicity.
• acid hydrazides have excellent reactivity with acetaldehyde, which is abundant in tobacco smoke, so that the effect of significantly reducing the pungent odor peculiar to tobacco can be obtained.
• the hydrazide compound can be arbitrarily selected from the above-mentioned adipic acid dihydrazide, dodecanedioic acid dihydrazide, succinate dihydrazide and the like. Among them, adipic acid dihydrazide is more preferable because it exhibits an appropriate solubility and the adsorbent can be easily attached to the micropores.
• the filter medium of the present invention contains an ion exchange resin in addition to an inorganic porous body in which an amine compound is supported between layers of the non-woven fabric in order to efficiently remove the target gas regardless of whether it is a polar or non-polar gas. There is.
• the ion exchange resin is not particularly limited, and is a strongly acidic cation exchange resin or a weakly acidic cation exchange resin capable of effectively chemically adsorbing a basic gas, or a strongly basic anion exchange resin or a weak base capable of effectively chemically adsorbing an acidic gas.
• a strongly acidic cation exchange resin or a weakly acidic cation exchange resin capable of effectively chemically adsorbing a basic gas
• a strongly basic anion exchange resin or a weak base capable of effectively chemically adsorbing an acidic gas.
• an amphoteric ion exchange resin or the like can be used.
• the base of the ion exchange resin is usually a copolymer of styrene and divinylbenzene, and depending on its base structure, it is roughly divided into a transparent and almost homogeneous gel type and a macroporous type having a physically large pore size.
• any ion exchange resin can be used.
• a strongly acidic cation exchange resin using a sulfonic acid group as an exchange group a weakly acidic cation exchange resin using a carboxyl group or a phenol hydroxyl group as an exchange group
• a strongly basic anion exchange resin using a quaternary ammonium base as an exchange group.
• Examples thereof include weakly basic anion exchange resins using first, second and third amines as exchange groups.
• a basic odor component such as ammonia
• the acidic cation exchange resin used in the present invention is preferably in the form of particles. If it is in the form of particles, it is preferable because it is possible to achieve both performance and economy.
• the fibrous acidic cation exchange resin increases the specific surface area, increases the contact efficiency with the target gas, and improves the performance (removal efficiency), but it is not effective in consideration of economy because of its high price.
• the average particle size of the acidic cation exchange resin used in the present invention is preferably 1000 ⁇ m or less, but the smaller the average particle size of the acidic cation exchange resin, the faster the adsorption rate of the adsorbent gas, and therefore 200 ⁇ m or less is more preferable. ..
• the lower limit of the average particle size is not particularly limited, but if the average particle size is less than 100 ⁇ m, the particles tend to scatter and the handleability and processability of the acid cation exchange resin tend to deteriorate. Therefore, the average particles of the acid cation exchange resin are average particles.
• the diameter is preferably 50 ⁇ m or more, and more preferably 100 ⁇ m or more.
• the average particle size referred to here refers to the mass average particle size measured by the activated carbon test method specified in JIS-K1474 (2014).
• the content ratio of the acidic cation exchange resin to the inorganic porous body carrying the acid hydrazides used in the present invention is preferably in the range of 10 to 300%.
• the content ratio of the acidic cation exchange resin is more preferably 30% or more.
• the filter medium of the present invention preferably contains activated carbon in addition to the inorganic porous body in which the amine compound is supported and the ion exchange resin between the layers of the non-woven fabric.
• activated carbon those made from coconut shell, coal, wood flour, phenol resin and the like are preferable.
• granular activated carbon having a relatively small particle size which is commercialized through steps such as firing, washing, pulverization, and spheroidization, is preferable.
• the activated carbon used in the filter medium of the present invention preferably has the following pore structure. That is, the pore volume of the pores having a pore diameter of 0.4 nm or more and 2 nm or less calculated by the MP method is in the range of 0.40 cc / g or more and 0.55 cc / g or less, and the MP method and The ratio of the pore volume of the pores having a pore diameter of 0.4 nm or more and 2 nm or less to the pore volume of the pores having a pore diameter of 0.4 nm or more calculated by the BJH method is 75% or more. Is preferable. A more preferable volume ratio is 85% or more.
• the pore volume formed by the pores of a specific size is in a specific range, that is, a specific number of pores of a specific size are present in the activated carbon, and further.
• the ratio of the pore volume of pores having a pore diameter of 0.4 nm or more and 2 nm or less to the pore volume of pores of 0.4 nm or more is 75% or more, that is, the pore diameter is finer than 2 nm.
• the adsorbent having this activated carbon can adsorb and remove odorous components such as toluene. It has excellent performance, and the desorption of odorous components such as toluene once adsorbed from the adsorbent is suppressed.
• the MP (MICROPORE) method is an analysis method that can quantify the distribution of micropores in the pore size of activated carbon.
• a method for analyzing the pore diameter and pore volume of the pore diameter of activated carbon there are MP (MICROPORE) method, BJH (Barrett-Joiner-Halenda) method, and the like.
• the MP method suitable for analysis in this range is adopted for the analysis of micropores having a pore diameter of 0.4 to 2 nm in which capillary condensation does not occur.
• the BJH method is adopted for the analysis of macropores having a pore diameter exceeding 2 nm.
• the pore volume of the pore having a pore diameter of 0.4 nm or more calculated by the MP method and the BJH method in the present invention is obtained by the value of the pore volume obtained by the MP method and the BJH method. It means the total value of the pore volume values.
• alkali metal compounds have high reactivity with acid-based gases such as acetic acid, alleviate the acid-based "sour odor", and can change the odor that is difficult for the user to perceive.
• the alkali metal compound can be arbitrarily selected from potassium hydroxide, potassium carbonate, sodium hydrogen carbonate and the like.
• activated carbon impregnated with an alkali metal compound is referred to as alkaline impregnated activated carbon.
• the activated carbon, the inorganic porous body carrying acid hydrazides, and the cation exchange resin may be arranged in any arrangement, either in the same layer or in different layers, but when the activated carbon impregnated with alkali is contained.
• the above-mentioned adsorbent is supported between layers of the non-woven fabric.
• the form of the non-woven fabric at that time is not particularly limited, and examples thereof include chemical-bonded non-woven fabrics, wet paper-made non-woven fabrics, spunbonded non-woven fabrics, melt-blown non-woven fabrics, spunlaced non-woven fabrics, and air-laid non-woven fabrics.
• a particulate adsorbent uniformly mixed with a heat-adhesive material having a particle size equivalent to that of the adsorbent is uniformly mixed on one flat surface of the non-woven fabric.
• the heat-adhesive material used at that time is such as fibers, particles, and powder made of a thermoplastic resin such as a polyester resin, a polyamide resin, a polyolefin resin, and a modified resin thereof.
• the pore volume of pores having a pore diameter of 0.4 nm or more and 2 nm or less was calculated. Specifically, the pore volume of pores having a pore diameter of 0.4 nm or more and 2 nm or less was determined by the MP method. For the pore volume having a pore diameter of 0.4 nm or more, the pore volume of the pore having a pore diameter exceeding 2 nm is calculated by the BJH method, and this volume and the pore diameter obtained by the above-mentioned MP method are 0.4 nm or more. The pore volume of 2 nm or less was added.
• Secondary odor test (secondary odor (points) and comfort / discomfort (points))
• the evaluation filter medium frontage dimensions 20 cm ⁇ 20 cm obtained by the above-mentioned method of manufacturing the filter medium was placed in a test chamber made of clear acrylic volume 1 m 3, by burning tobacco (Moebius 10 mg) 5 present in the test chamber, the combustion fumes was collected on a filter medium for 30 minutes. This work was repeated 10 times to collect a total of 50 cigarette smokes.
• the evaluation filter medium after collecting the tobacco combustion smoke was placed in a checked plastic bag having dimensions: 200 x 280 mm and a thickness of 0.04 mm, and 1 L of clean air was further put into the bag. After that, the check of the plastic bag was closed, and the inside of the bag was kept in a sealed state for 6 hours.
• the odor intensity and the degree of comfort and discomfort of the air discharged from the adjusted plastic bag were scored by five panelists according to the criteria shown in Tables 3 and 4, and the average value was calculated.
• Example 1 (Inorganic porous body) As the inorganic porous body, porous silica (Fuji Silysia Chemical Ltd.) having an average particle diameter of 300 ⁇ m was used. (Adhesive) Low-density polyethylene (Tokyo Ink Co., Ltd.) was used as the adhesive. (Melting point 98-104 degrees) (Amine compound) Adipic acid dihydrazide (Nippon Kasei Chemical Company Limited) was used as the amine compound.
• Aldehyde adsorbent An aqueous solution prepared by dissolving the above-mentioned adipic acid dihydrazide in 7% by mass of water and an inorganic porous body were mixed and dried to prepare an aldehyde adsorbent.
• ion exchange resin As the ion exchange resin, a strongly acidic cation exchange resin having an average particle diameter of about 150 ⁇ m was used.
• Activated carbon As the activated carbon, sodium hydrogen carbonate-impregnated activated carbon having an average particle size of 230 ⁇ m was used.
• the production conditions for the activated carbon impregnated with sodium hydrogen carbonate are as follows.
• the ratio of the pore volume of the pores having a pore diameter of 0.4 to 2 nm to the pore volume of the pores was 86%.
• Non-woven fabric A As the non-woven fabric A, a wet papermaking non-woven fabric was used.
• Non-woven fabric B As the non-woven fabric B, a melt-blown non-woven fabric was used.
• Manufacturing method of filter media The filter medium was prepared by the following manufacturing method.
• a blend of 100 parts by mass of an aldehyde adsorbent, 90 parts by mass of an adhesive, 100 parts by mass of an ion exchange resin and 100 parts by mass of activated carbon impregnated with sodium hydrogen carbonate is uniformly sprayed on the non-woven fabric A, and the temperature is increased from 110 ° C. in a heating furnace.
• the adhesive was melted by heating at 130 ° C. After laminating the non-woven fabric B on the sprayed surface, the non-woven fabric B was pressed by a nip roll to produce a filter medium.
• Example 2 Aldehyde adsorbent The same as in Example 1 was used. (glue) The same as in Example 1 was used. (Ion exchange resin) The same as in Example 1 was used. (Activated carbon) The same as in Example 1 was used. (Non-woven fabric A) The same as in Example 1 was used. (Non-woven fabric B) The same as in Example 1 was used. (Non-woven fabric C) As the non-woven fabric C, a melt-blown non-woven fabric was used. (Manufacturing method of filter media) The filter medium was prepared by the following manufacturing method.
• Example 3 Aldehyde adsorbent The same as in Example 1 was used. (glue) The same as in Example 1 was used. (Ion exchange resin) The same as in Example 1 was used. (Activated carbon) As the activated carbon, unimpregnated activated carbon A (average particle size 230 ⁇ m) was used. (Non-woven fabric A) The same as in Example 1 was used. (Non-woven fabric B) The same as in Example 1 was used. (Filter material) As for the composition of the filter medium, the one under the following conditions was used.
• Example 4 Aldehyde adsorbent The same as in Example 1 was used. (glue) The same as in Example 1 was used. (Ion exchange resin) The same as in Example 1 was used. (Activated carbon) As the activated carbon, unattached activated carbon B (average particle size 230 ⁇ m, pore volume of pores having a pore diameter of 0.4 to 2 nm calculated by the MP method is 0.39 cc / g, calculated by the MP method and the BJH method). The ratio of the pore volume of the pores having a pore diameter of 0.4 to 2 nm to the pore volume of the pores having a pore diameter of 0.4 nm or more was 75%) was used.
• Non-woven fabric A The same as in Example 1 was used.
• Non-woven fabric B The same as in Example 1 was used.
• (Filter material) As for the composition of the filter medium, the one under the following conditions was used. Condition: A filter medium in which 100 parts by mass of an aldehyde adsorbent, 90 parts by mass of an adhesive, 100 parts by mass of an ion exchange resin and 100 parts by mass of unattached activated carbon B are interposed between the nonwoven fabric A and the nonwoven fabric B.
• Example 5 (Aldehyde adsorbent) The same as in Example 1 was used. (glue) The same as in Example 1 was used. (Ion exchange resin) The same as in Example 1 was used. (Activated carbon) As the activated carbon, unattached activated carbon C (average particle size 230 ⁇ m, pore volume of pores having a pore diameter of 0.4 to 2 nm calculated by the MP method is 0.40 cc / g, calculated by the MP method and the BJH method). The ratio of the pore volume of the pores having a pore diameter of 0.4 to 2 nm to the pore volume of the pores having a pore diameter of 0.4 nm or more was 51%) was used.
• Non-woven fabric A The same as in Example 1 was used.
• Non-woven fabric B The same as in Example 1 was used.
• (Filter material) As for the composition of the filter medium, the one under the following conditions was used. Condition: A filter medium in which 100 parts by mass of an aldehyde adsorbent, 90 parts by mass of an adhesive, 100 parts by mass of an ion exchange resin and 100 parts by mass of unattached activated carbon C are interposed between the nonwoven fabric A and the nonwoven fabric B.
• Example 6 Aldehyde adsorbent The same as in Example 1 was used. (glue) The same as in Example 1 was used. (Ion exchange resin) As the ion exchange resin, a strongly acidic cation exchange resin having an average particle diameter of about 650 ⁇ m was used. (Activated carbon with sodium hydrogen carbonate) The same as in Example 1 was used. (Non-woven fabric A) The same as in Example 1 was used. (Non-woven fabric B) The same as in Example 1 was used. (Filter material) As for the composition of the filter medium, the one under the following conditions was used.
• Example 7 Aldehyde adsorbent
• glue The same one used in Example 1 was used.
• Ion exchange resin The same as in Example 6 was used.
• Activated carbon The same as in Example 3 was used.
• Non-woven fabric A The same as in Example 1 was used.
• Non-woven fabric B The same as in Example 1 was used.
• Filter material As for the composition of the filter medium, the one under the following conditions was used.
• Example 8 Aldehyde adsorbent
• glue The same as in Example 1 was used.
• Ion exchange resin The same as in Example 6 was used.
• Non-woven fabric A The same as in Example 1 was used.
• Non-woven fabric B The same as in Example 1 was used.
• Comter material As for the composition of the filter medium, the one under the following conditions was used. Condition: A filter medium in which 100 parts by mass of an aldehyde adsorbent, 60 parts by mass of an adhesive and 100 parts by mass of an ion exchange resin are interposed between the layers of the non-woven fabric A and the non-woven fabric B.
• Example 9 (Aldehyde adsorbent) The same as in Example 1 was used. (glue) The same as in Example 1 was used. (Ion exchange resin) The same as in Example 1 was used. (Non-woven fabric A) The same as in Example 1 was used. (Non-woven fabric B) The same as in Example 1 was used. (Filter material) As for the composition of the filter medium, the one under the following conditions was used. Condition: A filter medium in which 100 parts by mass of an aldehyde adsorbent, 60 parts by mass of an adhesive and 100 parts by mass of an ion exchange resin are interposed between the layers of the non-woven fabric A and the non-woven fabric B.
• Example 10 Aldehyde adsorbent
• glue The same as in Example 1 was used.
• Ion exchange resin The same as in Example 1 was used.
• Non-woven fabric A The same as in Example 1 was used.
• Non-woven fabric B The same as in Example 1 was used.
• Non-woven fabric C The same as in Example 2 was used.
• Filter material As for the composition of the filter medium, the one under the following conditions was used.
• Example 1 (Inorganic porous body) The same as in Example 1 was used. (glue) The same as in Example 1 was used. (Ion exchange resin) The same as in Example 3 was used. (Activated carbon) The same as in Example 3 was used. (Non-woven fabric A) The same as in Example 1 was used. (Non-woven fabric B) The same as in Example 1 was used. (Filter material) As for the composition of the filter medium, the one under the following conditions was used.
• Example 2 (Aldehyde adsorbent) The same as in Example 1 was used. (glue) The same as in Example 1 was used. (Activated carbon) Example 3 The same thing was used. (Non-woven fabric A) The same as in Example 1 was used. (Non-woven fabric B) The same as in Example 1 was used. (Filter material) As for the composition of the filter medium, the one under the following conditions was used. Condition: A filter medium in which 100 parts by mass of an aldehyde adsorbent, 100 parts by mass of unattached activated carbon and 60 parts by mass of an adhesive are interposed between the nonwoven fabric A and the nonwoven fabric B.
• Table 1 summarizes the configurations and characteristics of the filter media of each example and comparative example.
• the filter media of Examples 1 to 10 have an inorganic porous body impregnated with acid hydrazides as an amine compound, excellent results in deodorizing performance of acetaldehyde can be obtained, and they have an ion exchange resin. The results of excellent deodorizing performance of ammonia were obtained, and the degree of odor was low in all cases.
• the filter media of Examples 1 to 7 had activated carbon, the results obtained that the deodorizing performance of acetic acid was superior to that of the filter media of Examples 8 to 10 having no activated carbon.
• the filter media of Examples 1, 2 and 6 have activated carbon impregnated with sodium hydrogen carbonate, they are further compared with the filter media of Examples 3, 4, 5 and 7 not impregnated with sodium hydrogen carbonate. The result was that the deodorizing performance of acetic acid was excellent.
• the filter media of Examples 1, 2, 3, 4, 5, 9 and 10 have an ion exchange resin having a small particle size
• the filter media of Examples 6 to 8 have an ion exchange resin having a large particle size. In comparison, the results obtained that the deodorizing performance of ammonia was excellent.
• Example 2 Compared with Example 1, in Example 2, the activated carbon impregnated with sodium hydrogen carbonate, the aldehyde adsorbent, and the ion exchange resin are arranged in different layers, so that the activated carbon and the chemicals adhering to the aldehyde are not affected by each other. Results were obtained that were effective in deodorizing performance and suppressing secondary odor.
• the pore volume of pores having a pore diameter of 0.4 to 2 nm calculated by the MP method as unattached activated carbon is 0.42 cc / g, and the pore diameter calculated by the MP method is 0.4 nm. Since activated carbon is used in which the ratio of the pore volume of the pores having a pore diameter of 0.4 to 2 nm to the pore volume of the above pores is 86%, it is compared with Examples 4 and 5 and is secondary. The result of suppressing the odor was obtained.
• Example 9 Since the filter medium of Example 9 has an aldehyde adsorbent and an ion exchange resin in the same layer, ammonia and acetaldehyde are compared with the filter medium having no aldehyde adsorbent and an ion exchange resin in the same layer of Example 10. The results obtained that the secondary odor was suppressed by efficiently removing the gas and removing these gases once adsorbed by the adsorbent by the other adsorbent interposed in the same layer.
• the filter medium of Comparative Example 1 does not have an aldehyde adsorbent, the deodorizing performance of aldehyde is inferior, and the filter medium of Comparative Example 2 does not have an ion exchange resin, so that the deodorizing performance of ammonia is poor. Inferior results were obtained, and both had a high degree of odor.
• the filter medium of the present invention has excellent adsorption performance for polar gases such as ammonia and aldehydes, and has few problems of secondary odor during long-term use.
• it is preferably used as an air filter for purifying pet odor air, which is regarded as a problem as indoor odor in facilities for the elderly.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Analytical Chemistry (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• Epidemiology (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Inorganic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Geology (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=77892037

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (1)

Citations (5)

Family Cites Families (12)

• 2021
  • 2021-03-12 JP JP2021529400A patent/JPWO2021193137A1/ja active Pending
  • 2021-03-12 KR KR1020227024815A patent/KR20220153577A/ko active Pending
  • 2021-03-12 CN CN202180022795.4A patent/CN115243780A/zh active Pending
  • 2021-03-12 WO PCT/JP2021/010024 patent/WO2021193137A1/ja not_active Ceased

Patent Citations (5)

Also Published As

Similar Documents

Legal Events