WO2008066022A1

WO2008066022A1 - Filter material for air cleaning, and air cleaning filter for clean-up of vehicle interior

Info

Publication number: WO2008066022A1
Application number: PCT/JP2007/072819
Authority: WO
Inventors: Yuzuru Yoshinami; Sadahito Goto; Yoshiyuki Kitagawa; Kotaro Shimokawa
Original assignee: Nissan Motor Co., Ltd.; Kikkoman Corporation; Toyo Boseki Kabushiki Kaisha
Priority date: 2006-11-27
Filing date: 2007-11-27
Publication date: 2008-06-05
Also published as: JP2008132405A

Abstract

Disclosed are a filter material and a filter for air cleaning, each of which has excellent dust removal performance and anti-bacterial/anti-allergen performance, produces no odor or causes no removal of an active substance from the filter material, and has low air-flow resistance. The filter material for air cleaning comprises an upstream-side member comprising a proanthocyanidin-containing material or a glucose extract carried on a non-woven fabric and a downstream-side member comprising an electret non-woven fabric, wherein the upstream-side material and the downstream-side material are laminated on each other.

Description

Specification

Air purification filter medium and air purification filter for vehicle interior purification

Technical field

TECHNICAL FIELD [0001] The present invention relates to an air cleaning filter medium and an air purification filter for purifying an interior of a vehicle using the air cleaning filter medium as a constituent material of the filter medium. More specifically, the present invention relates to a fine dust collecting performance and anti-resistance while maintaining low ventilation resistance. The present invention relates to an air purification filter medium to which allergen performance and antibacterial performance are imparted, and an air purification filter for vehicle interior purification.

Background art

[0002] Conventionally, in order to suppress the inflow of dust, pollen, exhaust gas particles, exhaust gas, etc. into the passenger compartment, and / or have occurred in the passenger compartment! In order to remove substances, air purifier filters (cabin filters) have been used in automobile air conditioners and cabin air purifiers.

[0003] In recent years, the functions required of the above-mentioned filters are not limited to dust collection and deodorization, but have been required to play a role as functional members having additional functions such as antibacterial, antiviral, and antiallergens. Yes. The anti-allergen function required for filters removes or inactivates pollen particles, such as cedar, cypress, and ragweed entering from outside, and mite bodies and their excreta derived from the passenger compartment, and in some cases pet hair. The purpose is to make it.

[0004] The filter having such an anti-allergen function includes, for example, an anti-allergen agent that inactivates allergens present in the environment by utilizing the protein binding action of a tannic acid compound, its use, and the above components. A filter or the like having an allergen inactivation performance by applying a tea extract is known (for example, patent documents;! To 3).

[0005] However, the tea extract has a unique odor due to volatile components, and catechin gallate has the problem that the binding activity to the target allergen is not sufficient. Therefore, if such a substance is supported on a substrate such as a nonwoven fabric to obtain a filter having an anti-allergen function with a sufficient effect, the amount of the support must be increased.

As a result, there were problems that the ventilation resistance of the filter was increased and the amount of odorous components dissipated was increased. [0006] Furthermore, a deodorizing filter carrying a force techin for purifying air in a passenger compartment of an automobile is known (Patent Document 4). However, in the manufacture of the deodorizing filter disclosed in Patent Document 4, it is necessary to mix and carry catechin and a binder component. For this reason, the activity of catechin itself is masked by the use of a binder that increases the ventilation resistance of the filter. Is not enough.

[0007] Proanthocyanidins are known as compounds different from catechins having an anti-allergen function, and filters using polyphenols mixed with chlorogenic acid or the like as filters using the proanthocyanidins Are known (for example, Patent Documents 5 and 6).

Patent Document 1: Japanese Patent Application Laid-Open No. 61-44821

Patent Document 2: Japanese Patent Laid-Open No. 06-279273

Patent Document 3: Japanese Patent Laid-Open No. 2000-5531

Patent Document 4: Japanese Laid-Open Patent Publication No. 2003-210559 (Paragraph [0009])

Patent Document 5: JP 2000-334230

Patent Document 6: Japanese Unexamined Patent Publication No. 2002-95916

Disclosure of the invention

Problems to be solved by the invention

[0009] However, in Patent Documents 5 and 6 described above, only the deodorizing action and the antioxidant action of the drug alone are considered, and in Patent Document 5, a non-woven fabric made of charged fibers (electret nonwoven fabric) is used. In Patent Document 6, where the polyphenol is impregnated and the non-woven fabric made of charged fibers disappears and the filter collection efficiency is not sufficient, the polyphenol adheres to the net-like material. Therefore, the filter performance is not sufficient in terms of collection efficiency. In Patent Documents 5 and 6, about 50% of chlorogenic acid flavonols are used in addition to proanthocyanidins, and the function of activity against allergen proteins is not sufficient. It has a problem that odor is generated. Also, there is no description about the required amount of the drug for obtaining the desired activity, and if the amount of the drug that obtains sufficient performance with the polyphenolate composition is loaded, the filter ventilation resistance increases particularly in the case of the nonwoven fabric. The problem occurs. [0010] The present invention has been made against the background of the problems of the prior art described above, and is excellent in dust removal performance and antibacterial and antiallergen performance, and further has a low airflow resistance that prevents generation of odors from the filter medium and detachment of drugs! /, It aims at providing the filter medium and filter for air purification. Means for solving the problem

[0011] As a result of intensive studies to solve the above problems, the present inventors have found that a filter medium loaded with proanthocyanidins, particularly a grape extract, has high! /, Antiallergenicity and antibacterial properties. However, the inventors have found that it is possible to develop excellent filter performance by generating the odor component and removing the active agent, and further by laminating the filter medium and the electret filter.

That is, the present invention relates to the following.

(1) A filter medium for air cleaning, wherein an upstream member made of a nonwoven fabric carrying a proanthocyanidin-containing material and a downstream member made of an electret nonwoven fabric are laminated.

(2) The air-cleaning filter medium as described in (1) above, wherein the proanthocyanidin-containing material is a grape extract.

(3) The air-cleaning filter medium according to (1) or (2), wherein the proanthocyanidin-containing material has a proanthocyanidin content of 80% by mass or more.

(4) The air according to any one of the above (1) to (3), wherein the carrying amount force of the proanthocyanidin-containing material in the upstream member is S 0 .;! 10. Og / m ² . Filter media for cleaning. (5) The air purifying filter medium according to (1), (4) V, or any of the above, wherein the downstream member is further laminated with an activated carbon-containing layer.

(6) The air purifying filter medium according to any one of (1) and (5) above, wherein the nonwoven fabric constituting the upstream member is a polyester nonwoven fabric.

(7) The air filter medium according to any one of (1) and (6) above, wherein the proanthocyanidins contained in the proanthocyanidin-containing material have a molecular weight of 3000 or more.

(8) An air purifying filter for purifying a vehicle interior, wherein the air purifying filter medium according to any one of the above (1) and (7) formed in a pleat shape is used as a filter medium part. The invention's effect

[0013] According to the present invention, it is possible to obtain an air purifying filter medium and a vehicle interior purifying air purifying filter that are low! /, Excellent in dust removal performance and antibacterial antiallergen performance due to ventilation resistance, and free from odor generation and chemical removal.

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] The air-cleaning filter medium of the present invention is characterized in that an upstream member made of a nonwoven fabric carrying a proanthocyanidin-containing material and a downstream member made of an electret nonwoven fabric are laminated.

[0015] The electret non-woven fabric constituting the downstream member can collect fine dust of 1 m or less due to the action of static electricity, and therefore is 10 or less that becomes a carrier for allergen substances in addition to automobile exhaust particles, sand dust, carbon black, etc. It is possible to capture various fine particles such as pollen, tick excrement and carcass, dandruff in cats and dogs, and mold spores.

[0016] The proanthocyanidin-containing product carried on the upstream member has an action of inactivating the allergen substance by a strong binding action with the allergen protein, and further has a strong antibacterial action. The allergen substance collected on the nonwoven fabric carrying the grape extract by carrying the proanthocyanidin-containing material on the nonwoven fabric and arranging and laminating on the upstream side of the electret nonwoven fabric with respect to the air flow in the filter Inactivation and prevention of fungal growth. The upstream member can further suppress the inactivation of the allergen substance collected on the adjacent electret nonwoven fabric, thereby preventing the growth of the fungus, and the initial outflow and re-flow of fine dust, allergen substance, fungus to the downstream side of the filter medium. Has the effect of effectively preventing scattering

[0017] The proanthocyanidins refer to a group of compounds in which flavan-3ol or flavan 3,4 diol is a structural unit and bonded by condensation or polymerization at the 46th or 48th positions. Proanthocyanidins can be obtained by chemical or semi-synthetic methods, or by using plant materials such as buds, oysters, apples, pine, peanuts, chestnuts, azuki beans, cranberries, etc. with water or organic solvents. Get tomorrow.

[0018] The proanthocyanidin-containing product as used in the present invention may be composed only of proanthocyanidins, and the effects of the present invention such as inactivation action and antibacterial action of allergen substances. As long as it exhibits, it may be a composition containing proanthocyanidins and other components. Examples of other components include substances derived from plant raw materials used for the extraction of proanthocyanidins, proanthocyanidin stabilizers and anti-degeneration agents, and linking for supporting proanthocyanidins on upstream members. It is an adhesive and an emulsifier.

[0019] The proanthocyanidin-containing product of the present invention includes a plant containing proanthocyanidins, such as grapes, oysters, apples, pine trees, and drops, because the degree of purification is easily adjusted and available. Extracts such as flower plants, chestnuts, azuki bean and cranberries can be preferably used. The plant extract can be obtained, for example, by the following method. That is, the tissues such as bark, fruit, pericarp and seed are extracted with water or an organic solvent, and then the obtained extract is subjected to vacuum distillation, spray drying, freeze drying, etc. to remove the solvent and prepare Can increase the proanthocyanidin content. Also, by performing purification-separation operations such as column chromatography, membrane separation using cellulose membranes, liquid-liquid separation using ethyl acetate monohydrate, etc., and decomposition of impurities by adding microorganisms such as yeast, etc. The ability to further increase the proanthocyanidin content in the extract is reduced by S.

[0020] The grape extract is particularly suitable as the plant extract of the present invention because it is very excellent in allergen inactivation and antibacterial properties and is safe. Polyphenols such as catechin, tannin, anthocyanin, chlorogenic acid, and gallic acid, which have been widely used in the past, are monomers and have high odor volatility with few active sites, while grape extract has a large amount. The proanthocyanidins, which are the body, are contained in large quantities, and this multimer has the ability to bind to allergen proteins and fungi in three dimensions, so it has excellent antiallergenic and antibacterial properties. It is thought that performance is exhibited. Therefore, since it has effective performance with a small amount of use compared to conventional drugs, it can be carried in a small amount on the filter medium, and it is possible to reduce the ventilation resistance as well as the odor peculiar to conventional polyphenols. Can be suppressed. Proanthocyanidins can be used as a mixture of proanthocyanidins of various molecular weights (degrees of polymerization), especially those having a molecular weight of 3000 or more High antiallergenic effect, low volatilization of low molecular weight, and generation of odor This is preferable because it does not cause a decrease in the life of the activated carbon in the active charcoal-containing layer preferably provided on the downstream side!

[0021] As a method for obtaining proanthocyanidins having a molecular weight of 3000 or more, for example, grapefruit It can be obtained by extracting from the squeezed meal or seeds using a mixed solvent of water ethanol. In addition, the proanthocyanidins thus obtained can be obtained by using, for example, a chromatographic method using a synthetic resin such as HP20 Sci. FoodAgric., 251537-1545 (1974)], an organic solvent such as ethyl acetate. By using a solvent extraction removal method to remove unnecessary fractions (JP-A-11-335369), a membrane separation method using a molecular weight fractionation membrane (JP-B 6-31208), etc., a molecular weight of 3000 or more, preferably a molecular weight Broanthocyanidins containing many fractions of 10,000 or less can be obtained.

[0022] The type of grape used as a raw material for the grape extract is not particularly limited, and any of white grape, red grape, black grape, etc. may be used. For example, Chardonnay, Riesling, Miratorgau, Niagara, Neo 'Muscat Species, Koshu species, Shirahane species (Licatiteri species), Kyoho species, Delaware species, Selesa species, Muscat berry varieties, and the like.

[0023] The grape extract is an extract from grape skin, pulp, and seeds, and can be used without limitation as long as it contains proanthocyanidins. A grape seed extract having a proanthocyanidin content of 80% by mass or more, which is more preferably 80% by mass or more. preferable. This is because proanthocyanidins, which are antibacterial and antiallergenic active ingredients, are mostly present in seeds rather than grape skins and flesh. The content of proanthocyanidins in the extract is preferably 95% by mass or less, more preferably 90% by mass or less. In some cases, the content of proanthocyanidins is less than 80% by mass! /, And the antibacterial and antiallergenic properties are sufficient! /. If odor is generated, the processability of attaching to the nonwoven fabric may be reduced. High purity! / Proanthocyanidin crystallizes and is easily removed from the fiber! /. A method for obtaining a proanthocyanidin extract having a content of 80% by mass or more from grape raw materials is disclosed in, for example, JP-A-11-080148, and is well known. As the grape extract having a proanthocyanidin content of 80% by mass or more, a commercially available product such as Dara Vinol SL (manufactured by Kikkoman Corporation) can also be used.

[0024] A known nonwoven fabric can be used as the nonwoven fabric that carries the proanthocyanidin-containing material, particularly the grape extract, and constitutes the upstream member. Specifically, polyolefin fibers such as polypropylene fibers and polyethylene fibers, polyester fibers, and polyamide fibers. Examples thereof include fibers, acrylic fibers, polybulal alcohol fibers, rayon and polynosic. Among these, polyester fiber, polyamide fiber or rayon fiber is used, and it is particularly preferable that it can be supported without using a binder by impregnating and attaching to an aqueous solution to form an upstream member. Its detailed mechanism is unknown. Proanthocyanidins or other extract components with a high molecular weight structure in grape extract have excellent binding strength and adhesiveness to fibers, and can be removed without using a binder. It is presumed that it is supported on the fiber without any failure. As a result of not using the solder, the grape extract, which is an active agent, is not covered or shielded by the binder, so that the proanthocyanidin-containing material exhibits its original characteristics in the upstream member of the present invention. be able to. A fiber material such as a woven fabric or a net other than the nonwoven fabric may be used as long as the air permeability is similar to that of the nonwoven fabric and the amount of the proanthocyanidin-containing material can be adjusted to the same level.

[0025] As the fiber material constituting the upstream member, it is preferable not to use an electret nonwoven fabric. When the proanthocyanidin-containing material is directly supported on the electret fiber, charge neutralization or shielding occurs due to the components of the proanthocyanidin-containing component, and the collection efficiency decreases. When the fibers sprayed on the fibers are immersed and dried, the electret charges disappear.

[0026] The method for supporting the proanthocyanidin-containing material in forming the upstream member is not particularly limited, but an aqueous solution of the proanthocyanidin-containing material such as grape extract is prepared, and the impregnation method, spray method, coating method, etc. It is possible to support by applying and drying. Further, if necessary, a small amount of a binder or a functional agent such as an antibacterial agent or an antifungal agent may be added to the aqueous solution containing the proanthocyanidins.

[0027] The loading amount of the proanthocyanidin-containing material in the upstream member is preferably from 0.;! To 10. Og / m ^2, more preferably 0.5 to 8. Og / m ² , more preferably 1. Ru 0~5. Og / m ² der. If it is less than 0. lg / m ² , the antibacterial and anti-allergen performance decreases, and if it exceeds 10. Og / m ² , the ventilation resistance of the filter medium increases.

[0028] The ability to remove a wide range of allergens by the upstream member of the present invention Specifically, derived from domestic animals (pets) such as inu, cats, bird hair, derived from plants such as cedar and ragweed, mite, cockroach body or Examples of such animal and plant proteins such as excreta can be given. [0029] The method of laminating the electret nonwoven fabric and the proanthocyanidin-containing nonwoven fabric, which are downstream members, is not particularly limited, but is mechanically entangled by needle punch, water punch, etc., powder, liquid or fibrous adhesive resin Can be widely used for laminating method with adhesive using adhesive sheet, embossing, heat fusion method with calendering, etc.Mechanical entanglement method with needle punch maintains or reduces density of electret nonwoven fabric Therefore, it is preferable in applications where dust retention is required, such as a cabin filter, because clogging is suppressed and the life is increased.

[0030] The method for obtaining the electret nonwoven fabric is not particularly limited, and a sheet electret method is provided in which a nonwoven fabric made of a dielectric material such as polyolefin, polyester, polylactic acid, polycarbonate, polychlorinated butyl, and polyvinylidene chloride is subjected to corona charging treatment. Various methods such as a film splitting method in which an electret film is cut into a nonwoven fabric to form a nonwoven fabric, and a friction charging method in which fibers having different charge trains are mixed and rubbed into a nonwoven fabric can be used. For the purpose of suppressing clogging due to dust accumulation and extending the service life, an electret non-woven fabric by a film splitting method or a tribocharging method capable of reducing the density is more preferable.

[0031] In the present invention, the electret non-woven fabric that is the downstream member preferably has an activated carbon-containing layer. The activated carbon-containing layer may be disposed on either the upstream side or the downstream side of the electret nonwoven fabric, but more preferably on the downstream side. According to such a configuration, it is possible to remove odorous components and harmful components such as exhaust gas, tobacco odor, VOC, livestock odor, body odor, etc., as well as generate particle components collected with proanthocyanidin-containing nonwoven fabric or electret nonwoven fabric. It is preferable because odor can be removed. The activated carbon-containing layer needs to be arranged on the downstream side of the electret non-woven fabric in order to prevent a decrease in adsorption performance due to dust, oil, and mist adhering to the activated carbon pores. The activated carbon-containing layer can be prepared by molding particulate, powdered, or fibrous activated carbon into a sheet by a known method.

[0032] The air purification filter medium of the present invention can be cut into a desired size in the state of a single filter medium, but can be filled with a large amount of filter medium within the same opening area by pleating. Since it can be used with force S, it can greatly improve the collection efficiency, antibacterial performance, and antiallergen performance, and it can prevent clogging during dust loading and is effective in extending the service life. In particular, air purification filters for vehicle interior purification use a pleated type because more dust is supplied to the filter medium than outside air. The shape is a preferred use form. In addition, the usage environment in vehicles is higher than that of residential filters, and the filter medium and filter of the present invention exhibit stable antiallergen performance even at high temperatures of 80 ° C. Suitable for indoor purification.

Example

[0033] The ability to explain the present invention in more detail below by way of examples The following examples are not of the nature limiting the present invention, and it is possible to change the design in accordance with the gist of the preceding and following descriptions. It is included in the technical scope of the invention.

[0034] (Measurement method)

The filter medium was ventilated at a passing line speed of 10 cm / s, and the differential pressure upstream and downstream of the filter medium was measured.

[0035] Ku · 1 μm dust removal efficiency>

Atmospheric dust particles are passed through the filter medium at a linear speed of 10 cm / s, and the number of particles of 1.0 to 2.0 m is measured with a particle counter (KC01B manufactured by Rion Co.) upstream and downstream of the filter medium. Calculated by

1. Ο ΐη Dust removal efficiency [%] = [(number of upstream particles minus number of downstream particles) / number of upstream particles] X 100 [0036] <Deodorization efficiency>

Using toluene gas, the upstream and downstream concentrations of the filter were measured with a gas detector tube at a linear speed of 30 cm / s, and the value obtained by subtracting the downstream gas concentration from the upstream gas concentration was divided by the upstream gas concentration. It was expressed as a percentage of the value obtained. The upstream concentration was 80 ± 5 ppm, the temperature was 25 ± 3 ° C, the relative humidity was 50 ± 5%, and the removal rate data one minute after the start of gas introduction was described in the examples.

Deodorization efficiency [%] = [(Upstream concentration Downstream concentration) / Upstream concentration] X 100

[0037] <Allergen reduction rate (ELISA method)>

Considering the effect of adsorption of allergen substances by activated carbon, only the grape extract-containing part excluding the activated carbon part in the filter medium was cut into lcm x 4cm size, and 50 ng / ml antigen solution (purified tick) Antigen Der f 11 / Asahi Food and Health Care Co., Ltd.) 200 1 is put in contact for 24 hours. Primary antibody solution (Der f2: anti-purified mite antigen (Der fll); Ab-Der fII (15El l) (mo) (M), Affin / Asahi Dispense 50,11 / well of Food and Health Care Co., Ltd.) and leave it at room temperature for 3 hours. After washing the plate 3 times, dispense 300 1 / well of blocking solution and leave it at 4 ° C. After washing the plate 3 times, dispense 50 1 / well of antigen solution and let stand at room temperature for 2 hours. After washing the plate 3 times, the secondary antibody solution (Der f2: stake-purified mite antigen (Der fll) —HRP; Ab-Der fll (13A4) (mo) (M), Affin. —HRP / Asahi Food Dispense 50 1 / well and leave at room temperature for 2 hours. After washing the plate 3 times, add TMB reagent 100 H 1 / well and start the enzyme reaction. Next, add 100 μl / well of 1M hydrochloric acid to stop the enzyme reaction, and measure the absorbance at 415 nm with a plate reader. Separately, a calibration curve of absorbance allergen concentration was prepared in the standard solution, the allergen concentration was calculated, and the allergen reduction rate was calculated by the following formula.

Allergen reduction rate [%] = [(50 Allergen concentration) / 50] X 100

[0038] <Antimicrobial properties>

JIS L 1902 Antibacterial test method for textile products · Antibacterial effect (quantitative test).

[0039] (Example 1)

Grape seed extract (Gravuinol SL manufactured by Kikkoman Corporation; 84% proanthocyanidin) dissolved in water and the amount of grape seed extract added to polyester 12g / m ² spunbond nonwoven fabric (R004 manufactured by Mitsui Chemicals, Inc.) After impregnation to give 3g / m ² , drying at 80 ° C for 30 minutes, the upstream member (supporting substrate: polyester, support material: grape extract) that is a grape seed extract-supporting sheet Created.

[0040] As an electret nonwoven fabric, a mixed nonwoven fabric of polypropylene short fibers (NC 2.2T x 51mm manufactured by Ube Nitto Kasei Co., Ltd.) and polyester short fibers (Hyme 1.7T x 44mm manufactured by Toyobo Co., Ltd.) is triboelectrically charged. The electret nonwoven fabric 25g / m < ² > used as a downstream member was produced.

[0041] stacked laminated mist synthetic rubber based hot melt resin 2 g / m ² sprayed to between the downstream member comprising from the upstream member and the electret nonwoven fabric is the grape seed extract carrying sheet, filter medium for air cleaning (E1) was obtained.

[Example 2] 70 parts by weight of granular coconut shell activated carbon with a particle size of SOO ^ m, 10 parts by weight of rayon fiber with 8 denier X fiber length, 8 parts by weight of polyester composite fiber with seascore structure, 1 A non-woven fabric containing activated carbon having a basis weight of 120 g / m ² was prepared by a wet papermaking method using 6 parts by weight of polybulal alcohol fiber having a denier X fiber length of 3 mm and 6 parts by weight of powdered polybulal alcohol. The electret of the filter medium prepared in Example 1 The activated carbon-containing nonwoven fabric was laminated on the nonwoven fabric side in the same manner as in Example 1 with a mist-like synthetic rubber hot melt resin (2 g / m ² ), and the air purification filter medium ( E2) was obtained.

[0043] (Comparative Example 1)

Example 1 is the same as Example 1 except that the electret nonwoven fabric in Example 1 is changed to an electret of polypropylene short fibers (2.2T x 51mm)! /, Na! /, And a spunlace nonwoven fabric is used as the downstream member. In the same manner, an air purification filter medium (R1) was obtained.

[0044] (Comparative Example 2)

Instead of the electret nonwoven fabric in Example 1, a non-electret spunlace nonwoven fabric of polypropylene short fibers (2.2T x 51mm) is used, and the nonwoven fabric (supporting substrate) on which the grape seed extract is further supported is polypropylene. An air purification filter medium (R2) was prepared in the same manner as in Example 1 except that 12 g / m ² spunbond manufactured by Mitsui Chemicals, Inc. was used.

[0045] (Comparative Example 3)

An air purification filter medium (R3) was prepared in the same manner as in Example 1 except that instead of the grape seed extract of Example 1, a tea extract (Shirai Matsushin Pharmaceutical Co., Ltd., 30 g of catechin) was used.

[Comparative Example 4]

Electret in the same manner as in Example 1 except that instead of the grape seed extract-carrying sheet of Example 1, a 12 g / m ² spunbond nonwoven fabric made of polyester (R004 made by Mitsui Chemicals) was used as the upstream member. A laminate with a non-woven fabric was prepared, and this and the activated carbon-containing non-woven fabric prepared in Example 2 were laminated with a mist-like synthetic rubber hot melt resin (2 g / m ² ) to obtain a filter medium for air purification ( R4) was obtained.

[0047] Evaluation results of Example 1 (filter medium E1) and comparative examples;! To 3 (filter medium R1 to R3) are shown in Table 1, and Example 2 (filter medium E2) and a comparative example in which active carbon-containing layers are laminated 4 (filter medium R4)! Table 2 shows the evaluation results for evaluating the rate. In addition to its characteristics as a filter medium, it was also evaluated for the extractability of the extract and the odor of the filter medium supported by the filter medium, which is problematic in manufacturing and handling. The drop-off property was judged by whether the extract-carrying sheet alone was struck several times on the white sheet and the powder-like material could be dropped off. As for odor, the odor of the filter medium itself in the state where the filter medium was laminated was judged by a sensory test, and the presence or absence of the odor was evaluated.

[table 1]

[Table 2]

As is apparent from Table 1, the filter using the filter medium in which the upstream side material carrying the grape seed extract and the downstream side member made of electret non-woven fabric shown in the examples are laminated is a fine material equivalent to an allergen substance. It has excellent trapping efficiency for small particles and has an allergen reduction rate of 99% or more, and has an excellent filtration function and reduction effect for allergen substances. The upstream member used in the filter of the example has excellent antibacterial properties. Since there is no odor of the member itself that does not drop off the dough seed material, the odor generated by the bacterial propagation is prevented, and the odor component removal performance of the downstream member during use can be maintained for a long time. As in Example 2, when combined with an activated carbon-containing layer, automobile exhaust gas, soot odor, indoor VOC, and the like, which are typical examples of toluene, can be purified, further reducing the odor of downstream members and removing harmful substances. It is effective for.

[0051] On the other hand, in the filter medium of Comparative Example 1, there is no downstream member of the electret nonwoven fabric V. Therefore, fine dust cannot be collected and fine allergen substances are not collected, and the downstream side of the filter medium is not collected. Leaked into The filter medium of Comparative Example 2 not only collects fine dust, but also broantcyanidine-containing materials fall off, so that the amount supported during production and use cannot be stably maintained, and the fallen matter scatters downstream. It had a problem of end. Although the filter medium of Comparative Example 3 has a fine dust collection efficiency, it has insufficient allergen reduction effect and antibacterial property, and furthermore, since the filter medium itself has a tea-like odor, odor is also generated on the downstream side of the filter medium. It was not preferable from the viewpoint of air purification. The filter medium of Comparative Example 4 was insufficient in both allergen reduction rate and antibacterial properties.

Industrial applicability

[0052] The filter of the present invention can remove dust, diesel exhaust gas, pollen, dust and the like in the air with high efficiency, and further reduces the effect of reducing allergen substances effectively on the filter medium and suppresses bacterial growth. Has antibacterial effect and no odor generation. Therefore, particulate materials such as air-conditioning equipment, textile products such as woven fabrics and non-woven fabrics, masks, air purification filters for vehicles, air purification filters for household appliances, air cleaner filters for vinole's factories, air purification filters for office equipment, etc. It can be widely used in fields where allergen substances and fungus odor are problematic.

Claims

The scope of the claims

[1] An air purifying filter medium, wherein an upstream member made of a nonwoven fabric carrying a proanthocyanidin-containing material and a downstream member made of an electret nonwoven fabric are laminated.

[2] The air purifying filter medium according to [1], wherein the proanthocyanidin-containing material is a grape extract.

[3] The air purification filter medium according to claim 1 or 2, wherein the proanthocyanidin-containing material has a proanthocyanidin content of 80% by mass or more.

[4] The air-cleaning filter medium according to any one of claims 1 to 3, wherein the carrying capacity of the proanthocyanidin-containing material in the upstream member is from 0.;! To 10.0 g / m ^2. .

[5] The air-cleaning filter medium according to any one of [1] to [4], wherein the downstream member further includes an activated carbon-containing layer.

[6] The air-cleaning filter medium according to any one of [5] to [5], wherein the nonwoven fabric constituting the upstream member is a polyester nonwoven fabric.

[7] Proanthocyanidins contained in the proanthocyanidin-containing product have a molecular weight of 3

It is 000 or more, The filter medium for air cleaning in any one of Claims 1-6 characterized by the above-mentioned.

[8] An air purifying filter for purifying a vehicle interior, wherein the air purifying filter medium according to any one of claims 1 to 7 formed in a pleat shape is used as a filter medium part.