WO2022092066A1 - 吸着剤およびその製造方法、濾材ならびにエアフィルター - Google Patents
吸着剤およびその製造方法、濾材ならびにエアフィルター Download PDFInfo
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- WO2022092066A1 WO2022092066A1 PCT/JP2021/039438 JP2021039438W WO2022092066A1 WO 2022092066 A1 WO2022092066 A1 WO 2022092066A1 JP 2021039438 W JP2021039438 W JP 2021039438W WO 2022092066 A1 WO2022092066 A1 WO 2022092066A1
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- Prior art keywords
- adsorbent
- compound
- porous body
- inorganic porous
- amine
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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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Abstract
Description
使用されているが、低級脂肪族アルデヒドの活性炭への平衡吸着量は他の悪臭成分に比べて著しく小さく、実用性能を有していない。
(1)吸着剤のpH(水素イオン指数)
25℃の温度の純水100gに対して、吸着剤を5g浸漬し、軽く攪拌した後10分間放置し、得られた水溶液のpHをpH計(ラコム社 Ecoscan pH 5)によって測定した。測定は3回行い、その平均値を採用した。
アミン系化合物およびスルフィド化合物を混合した水溶液を無機多孔質体に含浸・乾燥させ調整した。
吸着剤および熱可塑性樹脂を混合攪拌した混合粉体を、通気性を有するシート状物に散布した後、さらに他の通気性を有するシート状物を重ね合わせて熱プレスを行い一体化して総目付を測定し、総目付から2枚の通気性を有するシート状物の目付を差し引いた値に各成分の仕込み量比を掛け、濾材全体に対する吸着剤および熱可塑性樹脂のそれぞれの担持量とした。
12cm×12cmの平板状の濾材を、10cm×10cmの実験用のダクトに取り付け、ダクトに温度が23℃で湿度が50%RHの空気を、0.2m/secの速度で送風した。さらに上流側から、標準ガスボンベによりアセトアルデヒド(C2H4Oとも表記する。)を上流濃度10ppmとなるように添加し、濾材の上流側と下流側とにおいてエアをサンプリングし、赤外吸光式連続モニターを使用して、それぞれのアセトアルデヒド濃度を経時的に測定し、次式によって除去効率を算出した。
除去効率(%)=[(C0-C)/C0]×100
ここに、
C0:上流側のアセトアルデヒド濃度(10ppm)
C:下流側のアセトアルデヒド濃度(ppm)
アセトアルデヒドの添加開始から100秒後の除去効率を初期除去効率とした。サンプル作製直後のアセトアルデヒドの初期除去効率が40%以上であれば合格とした。
平板状のガス吸着シートを、温度が85℃で湿度が85%RHに設定した環境において、サンプル作製後3日間静置した後、実験用のダクトに取り付け、上記(4)に記載の方法でアセトアルデヒド除去性能を評価した。
吸着容量の低下率(%)=[((サンプル作製直後の吸着容量)-(経時劣化試験後の吸着容量))/(サンプル作製直後の吸着容量)]×100
経時劣化試験による吸着容量の低下率が50%以下であれば合格と評価した。
平板状のガス吸着シートを、温度120℃、湿度25%RHに設定した環境において、サンプル作製後1日間静置した後、実験用のダクトに取り付け、上記(4)に記載の方法でアセトアルデヒド除去性能を評価した。
吸着容量の低下率(%)=[((サンプル作製直後の吸着容量)-(耐熱性試験後の吸着容量))/(サンプル作製直後の吸着容量)]×100
耐熱性試験による吸着容量の低下率が50%以下であれば「優れる」と評価した。
(無機多孔質体)
無機多孔質体として、平均粒子径300μmの多孔質シリカ(富士シリシア化学(株))を用いた。
アジピン酸ジヒドラジド(大塚化学社)を用いた。
L-メチオニン(和研薬株式会社製)を用いた。
上記アミン系化合物5質量%および上記スルフィド化合物2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Aを調製した。吸着剤Aを水100gに5g分散させた際のpHは、6.3であった。
エアの流れに対して上流側に位置させる通気性シート状物には、単繊維繊度が1.5dtexのビニロン(ポリビニルアルコール)繊維16.5質量% 、単繊維繊度が7.1dtexのビニロン(ポリビニルアルコール)繊維22質量% 、単繊維繊度が2.0dtexのポリエチレンテレフタレート繊維16.5質量%、およびリン系難燃剤含有アクリル樹脂バインダー45質量%からなる、目付けが50g/m2のケミカルボンド不織布を用いた。
エアの流れに対して下流側に位置させる通気性シート状物には、ポリプロピレン繊維のエレクトレット加工メルトブロー不織布からなる、目付が20g/m2の帯電繊維シートを用いた。
低密度ポリエチレン(東京インキ(株)製 融点98~104℃)を用いた。
上記吸着剤と上記熱融着樹脂との質量比率が2:1となるように混合して均一になるまで攪拌し、これを下流側用の通気性シート状物の上に散布し、さらにその上から上流側用の通気性シート状物を被せ、熱プレスして濾材Aを作製した。
(無機多孔質体)
実施例1(吸着剤A)で用いたのと同様のものを用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
ジエチルスルフィド(東京化成工業株式会社製)を用いた。
上記アミン系化合物5質量%および上記スルフィド化合物2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Bを調製した。吸着剤Bを水100gに5g分散させた際のpHは、6.4であった。
(濾材の製造)
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Bを用いたこと以外は実施例1と同様にして、濾材Bを作製した。
(無機多孔質体)
実施例1(吸着剤A)で用いたのと同様のものを用いた。
1,3-ジメチル尿素(ナカライテスク社製)を用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
上記アミン系化合物5質量%および上記スルフィド化合物2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Cを調製した。吸着剤Cを水100gに5g分散させた際のpHは、6.4であった。
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Cを用いたこと以外は実施例1と同様にして、濾材Cを作製した。
(無機多孔質体)
実施例1(吸着剤A)で用いたのと同様のものを用いた。
カルボジヒドラジド(日本ファインケム社製)を用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
上記アミン系化合物5質量%および上記スルフィド化合物2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Dを調製した。吸着剤Dを水100gに5g分散させた際のpHは、6.5であった。
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Dを用いたこと以外は実施例1と同様にして、濾材Dを作製した。
(無機多孔質体)
実施例1(吸着剤A)で用いたのと同様のものを用いた。
コハク酸ジヒドラジド(日本ファインケム社製)を用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
上記アミン系化合物5質量%および上記スルフィド化合物2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Eを調製した。吸着剤Eを水100gに5g分散させた際のpHは、6.4であった。
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Eを用いたこと以外は実施例1と同様にして、濾材Eを作製した。
(無機多孔質体)
実施例1(吸着剤A)で用いたのと同様のものを用いた。
エチレン尿素(ナカライテスク社製)を用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
上記アミン系化合物5質量%および上記スルフィド化合物2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Fを調製した。吸着剤Fを水100gに5g分散させた際のpHは、6.5であった。
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Fを用いたこと以外は実施例1と同様にして、濾材Fを作製した。
(無機多孔質体)
吸着剤Aと同一の製品を用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
スルフィド化合物は用いず、代わりにL-システイン(トモケミカル社製)を用いた。
上記アミン系化合物5質量%およびL-システイン2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Gを調製した。吸着剤Gを水100gに5g分散させた際のpHは、6.5であった。
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Gを用いたこと以外は実施例1と同様にして、濾材Gを作製した。
(無機多孔質体)
実施例1(吸着剤A)で用いたのと同様のものを用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
スルフィド化合物は用いず、代わりにL-α-アラニン(ナカライテスク社製)を用いた。
上記アミン系化合物5質量%およびL-α-アラニン2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Hを調製した。吸着剤Hを水100gに5g分散させた際のpHは、6.4であった。
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Hを用いたこと以外は実施例1と同様にして、濾材Hを作製した。
(無機多孔質体)
実施例1(吸着剤A)で用いたのと同様のものを用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
スルフィド化合物は用いず、代わりに無水コハク酸(ナカライテスク社製)を用いた。
上記アミン系化合物5質量%および無水コハク酸2質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Iを調製した。吸着剤Iを水100gに5g分散させた際のpHは、6.5であった。
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Iを用いたこと以外は実施例1と同様にして、濾材Iを作製した。
(無機多孔質体)
実施例1(吸着剤A)で用いたのと同様のものを用いた。
実施例1(吸着剤A)で用いたのと同様のものを用いた。
スルフィド化合物は、用いなかった。
上記アミン系化合物5質量%を水に溶解させた水溶液と無機多孔質体とを混合し乾燥させて、吸着剤Jを調製した。吸着剤Jを水100gに5g分散させた際のpHは、6.5であった。
上流側用の通気性シート状物、下流側用の通気性シート状物、熱融着樹脂には実施例1で用いたのと同様のものを用い、吸着剤として吸着剤Jを用いたこと以外は実施例1と同様にして、濾材Jを作製した。
実施例1~6と比較例1~4のアセトアルデヒド除去効率と吸着容量および吸着容量の低下率を表1に示す。
Claims (11)
- 無機多孔質体に少なくともアミン系化合物および官能基にスルフィド基を有する化合物が担持されてなることを特徴とする吸着剤。
- 前記アミン系化合物が酸ヒドラジド類である、請求項1記載の吸着剤。
- 前記官能基にスルフィド基を有する化合物がメチオニンである、請求項1または2に記載の吸着剤。
- 水100gに5g分散させた際のpHが3.0以上7.5以下である、請求項1~3のいずれかに記載の吸着剤。
- 前記無機多孔質体に、さらに他の有機酸および無機酸からなる群から選ばれた少なくとも1種の酸を担持させてなる、請求項1~4のいずれかに記載の吸着剤。
- 前記無機多孔質体が多孔質シリカである、請求項1~5のいずれかに記載の吸着剤。
- 請求項1~6のいずれかに記載の吸着剤を用いてなることを特徴とする濾材。
- 前記吸着剤が通気性を有するシート状物で挟み込まれてなる、請求項7記載の濾材。
- 前記吸着剤が熱可塑性樹脂によって前記シート状物に固定されている、請求項7または8に記載の濾材。
- 請求項7~9のいずれかに記載の濾材を用いてなることを特徴とするエアフィルター。
- 官能基にスルフィド基を有する化合物とアミン系化合物を水に溶解し、これを無機多孔質体に添着し乾燥させることを特徴とする吸着剤の製造方法。
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