JP4603842B2 - Deodorant and deodorizing filter - Google Patents

Description

The present invention relates to a deodorizing agent and a deodorizing filter, and more particularly to a deodorizing agent and a deodorizing filter using granular activated carbon as a main material.

  As is well known, activated carbon has high odor adsorption performance, and activated carbon is used as the main material of deodorizing filters in many air purifiers. However, activated carbon captures odors by physically adsorbing (trapping) odors with the fine pores on the surface, so as the amount of adsorption increases with use, the adsorption performance decreases significantly, or the air purifier If the operation is stopped once and then restarted, the adsorbed odor is re-released.

Particularly in the case of a device used for an air cleaner of an automobile, since the inside of the vehicle is a narrow space that is sealed, the odor and chemical substances that come off from the activated carbon of the car air conditioner at high temperatures in summer have been a problem. As a means to solve this, an air filter configured to sandwich activated carbon and tea husk in a sandwich between filter media, physically adsorb odor etc. with activated carbon, and adsorb odor by chemical reaction depending on tea husk. Known (Patent Document 1).
Japanese Patent Laid-Open No. 2004-5016

  And in order to recover the above-mentioned decline in the adsorption performance of activated carbon, household deodorizing filters are generally treated by immersing them in neutral detergent water and then dried, and industrial deodorizing filters are dried at high temperature. Treatment was performed, but the release of odor when restarting operation after this treatment was also a problem.

  In view of the above circumstances, the present invention aims to provide a deodorizing filter that can suppress the release of odor after washing and drying, particularly for recovery of adsorption performance, and can be used comfortably even after reuse after recovery of adsorption performance. And

  Note that the air filter described in Patent Document 1 is a filter particularly suitable for car air conditioners, and is not premised on washing and drying for recovery of adsorption performance. It is the structure which combines with activated carbon as it is. Therefore, it is considered that the air filter described in Patent Document 1 cannot perform measures for performance recovery such as washing with water and drying.

In order to achieve the above object, the invention of claim 1 is to mix and heat oolong tea leaves pulverized and dried in a dry state to a low melting point polymer having a melting point of 150 degrees Celsius or less so as to be 20 to 70% by weight. to its a mixture heated and molded to the size and the granular activated carbon to mix the bulk specific gravity size and bulk density and brown-containing molded article of the particulate to be substantially the same after molding, and molded into particulate It is a deodorizer in which a tea-containing molded product is mixed with the granular activated carbon so as to be 1 to 20% by weight.

The invention of claim 2 is a de-odor filter ing by filling the deodorizing agent according to claim 1, wherein the bag-like fabric.

  The deodorizing filter of the present invention has little odor emission even when the amount of adsorption increases due to long-term use, and odor re-release is possible even after reuse after treatment such as washing and drying for recovery of adsorption performance. Less comfortable to use.

  Hereinafter, an embodiment of the present invention will be described along a manufacturing process. FIG. 1 is a diagram showing an outline of the manufacturing process of this embodiment. First, a tea leaf 1 as a material is prepared. The tea leaves 1 are preferably various types of commercially available green tea, Chinese tea represented by oolong tea, jasmine tea, black tea, and the like. These tea leaves 1 are pulverized in a dry state to form a powder. In order to effectively bring out the odor adsorbing action after the fusion with the polymer, the powder is preferably finer.

  Next, the tea leaves 2 processed into a powder form and the low melting point polymer 3 are mixed and then heated to melt. The low melting point polymer 3 preferably has a melting temperature of 200 degrees Celsius or less, and preferably 150 degrees Celsius or less in order to reduce thermal decomposition of components contained in tea. For example, EVA, olefin-based, polyester-based, or nylon-based commercially available hot melt or polyethylene resin is preferable. The mixing ratio of the powdered tea leaves 2 and the low melting point polymer 3 is set so that the weight ratio of the powdered tea leaves to the mixture is 20 to 70%.

  The heated and melted mixture 4 is pelletized (granulated) after cooling. In the pelletization method, the low melting point polymer 3 and the powdered tea leaves 2 are sufficiently mixed and melt extruded while being heated. There is a method of cutting after cooling the extruded melt. The size and bulk specific gravity of the pelletized tea-containing molded product 5 are as close as possible to the size and bulk specific gravity of the activated carbon 6. In the above pelletization method, it is preferable that the particle size of the powdered tea leaf 2 is 10 microns or less in order to lower the fluidity of the polymer in which the powdered tea leaf 2 is melted, and the low melting point of the powdered tea leaf 2 It is necessary to reduce the mixing ratio with respect to polymer 3. Specifically, the powdery tea leaves are preferably 50 or less with respect to the low melting point polymer 100.

  As a pelletizing method, instead of melting and extruding as described above, the mixture is once spread in a dish-like container to a certain thickness, heated and melted and cooled, and the cooled sheet is cut. It may be a method of cutting with a machine. Since there is no extrusion process in this method, the mixing ratio of the powdered tea leaves 2 to the low melting point polymer 3 can be increased to about 1: 2. When the proportion of the powdered tea leaves 2 is further increased, the pelletized tea-containing molded product 5 becomes brittle and easily collapses, and the tea-containing molded product that is broken during use as a final deodorizing filter becomes dust, which generates dust. There is a risk of being connected. Therefore, according to this method, the mixing ratio of the powdered tea leaves 2 and the low melting point polymer 3 is set so that the weight ratio of the powdered tea leaves to the mixture is 20 to 70%.

  In addition, when using the latter method as a pelletizing method, it is possible to use a binder such as a vinyl acetate emulsion because of the ease of molding. The amount added is preferably as small as possible.

  Furthermore, when mixing the powdered tea leaves 2 and the low melting point polymer 3, it is possible to mix powdered zeolite or powdered activated carbon with deodorizing performance as the third component, but mixing too much amount. Is relatively undesirably lowering the mixing ratio of the powdered tea leaves 2.

  Finally, the pelletized tea-containing molded product 5 and the granular activated carbon 6 are mixed at a predetermined ratio to form a deodorizer 7, and the bag-like fabric 8 is filled with the deodorizer 7 to obtain a deodorization filter 9. The mixing ratio of the tea-containing molded product 5 and the granular activated carbon 6 is set so that the weight ratio of the tea-containing molded product to the mixture is 1 to 20%.

  The bag-like fabric 8 can have various structures, but in this embodiment, two planar mesh-like fabrics 8a, a spacer portion 8b orthogonal to the fabric 8a, and ear portions 8c at both ends. The deodorizing agent 7 can be filled in a bag-like part 8d defined by the mesh-like fabric 8a and the spacer part 8b.

  The deodorizing filter 9 created as described above can be attached so as to follow the air suction side of a fine dust filter (hepa filter or the like) of the air cleaner itself, for example, and is included in cigarette smoke or the like upstream of the fine dust filter. Adsorbs odorous components or chemical substances.

  (Example 1) Commercial oolong tea manufactured by ITO EN Co., Ltd. (watering out and hot water out) was sufficiently pulverized by a mixer in a dry state to prepare 100 mesh powdered oolong tea. To 100 g of this powder, 90 g of EVA hot melt # 2030M (melting point of 97 degrees Celsius) manufactured by Tokyo Ink Co., Ltd. was added and mixed with a mixer, spread on a hollow dish to an average thickness of 2-3 mm, and 130 degrees Celsius. And then heated for 30 minutes. Although the lower surface of the tea-containing molded product that became a sheet after cooling was smooth, the upper surface had a surface with fine irregularities. This sheet-shaped tea-containing molded product was cut into about 2 mm × 2 mm vertically and horizontally using a cutter to obtain a dice-shaped granular molded product of approximately 2 × 2 × 3 mm.

  Then, 20 g of this granular tea-containing molded product and 400 g of coconut shell activated carbon (particle size: 2 mm) manufactured by Kuraray Chemical Co., Ltd. are mixed and evenly filled into a double fabric having an outer dimension of 420 mm × 310 mm having nine bag-like parts. And used as a deodorizing filter.

  For comparison of performance, only 400 g of coconut shell activated carbon (particle size: 2 mm) manufactured by Kuraray Chemical Co., Ltd. was filled in a double fabric having the same structure to prepare a deodorizing filter for comparison.

  The deodorizing function was evaluated using the deodorizing filter of this example (Example 1) and the deodorizing filter for comparison. Hereinafter, an apparatus for evaluation, an evaluation method, and an evaluation result will be described.

  (Evaluation apparatus) JEM 1467-1995 measuring apparatus, and an air purifier M-40 manufactured by Sharp Corporation was used as the air purifier. The wind speed was set to “rapid”.

  (Evaluation Method 1) Both filters (the deodorizing filter of the example and the deodorizing filter for comparison) were respectively attached to different air purifiers, and the smoke of 20 cigarettes was sucked in two portions and then put into a polyethylene bag. Stored for 2 hours. Meanwhile, the measuring box was thoroughly cleaned, the air inside was replaced with fresh air, and the dust filter of the air cleaner itself was replaced with a new one. Thereafter, both filters stored in the polyethylene bag are taken out and attached to the air purifier again, and the concentration of the tobacco odor that is re-released into the measuring device after being operated “rapidly” is determined after 30 and 60 minutes. Measurements were made in two portions. The concentrations of ammonia, acetaldehyde and acetic acid were measured as typical odors of cigarettes.

  (Evaluation Method 2) Both filters after performing the evaluation method 1 were attached to separate air purifiers, and an odor-smell sensory test was conducted at the outlet (inspection 1).

  Both filters after completion of inspection 1 were soaked in fresh tap water for 30 minutes, drained and attached to separate air purifiers again, and an odor-smell sensory test was conducted at the outlet (Inspection 2). The fine dust filter of the air cleaner itself was the same as that used in Evaluation Method 1.

  Soak both smoke filters for 20 cigarettes in the same way as in Evaluation Method 1, soak them in neutral detergent water (0.15% diluted water of Charmy Green manufactured by Lion Corporation) for 30 minutes, and rub the surface with a sponge. After sufficiently rinsing with fresh tap water, both filters that had been dipped again in fresh water for 20 minutes and drained were attached to the air purifier again and the same sensory test was performed (Test 3).

  Furthermore, the sensory test was also performed on what was attached to an air purifier after washing with water and dried for two days (test 4). The sensory test was recorded with a total of 9 people who felt a foul odor without showing a different filter.

  (Evaluation Result by Evaluation Method 1) As shown in FIG. 2, for ammonia and acetaldehyde, there is a clear concentration difference between this example (Example 1) deodorizing filter and comparative deodorizing filter. It was found that the deodorizing filter of this product had less re-release amount of tobacco odor. In addition, acetic acid was detected in a trace amount in the measurement after 60 minutes in the comparative deodorizing filter, but was not detected in the present example deodorizing filter.

  (Evaluation result by evaluation method 2) As shown in FIG. 3, the results of the tests 1, 2 and 3 are that the deodorizing filter of this example has fewer people who feel bad odor than the deodorizing filter for comparison, The result of the sensory test (test 2) conducted after 30 minutes of immersion in water was that all nine people had a bad odor with the deodorizing filter for comparison, but did not feel a bad odor with the deodorizing filter of this example. The smell at the time of inspection 3 was weak for both filters. The odor in the case of the inspection 4 was hardly judged because both filters had almost no odor.

  (Example 2) About Example 1, it replaced with oolong tea as a material, the commercially available sencha was used, and the other conditions were the same and the deodorizing filter was created. The deodorizing filter for comparison is the same as that of Example 1.

  The deodorizing function was evaluated using the deodorizing filter of Example 2 and the deodorizing filter for comparison. The apparatus for evaluation used the same thing as the above-mentioned, and the sensory test 1-3 of the above-mentioned evaluation method 2 was implemented about the evaluation method. The evaluation results for Example 2 will be described below.

  As shown in FIG. 4, the results of tests 1 to 3 were all performed after the deodorizing filter of Example 2 felt less odor than the deodorizing filter for comparison, especially after being immersed in tap water for 30 minutes. The result of the sensory test (Test 2) was that all nine people had a bad odor with the deodorizing filter for comparison as in Example 1, but did not feel the bad odor with the deodorizing filter in Example 2. Also, in the inspection 3 where the immersion treatment is performed in neutral detergent water, the deodorizing filter of Example 2 has more people who feel bad odor than the deodorizing filter for comparison (3 to 6 people). Although the release suppression function was demonstrated, the results were slightly inferior to the results in Example 1 (2 vs. 7).

The figure which showed the manufacturing process of the deodorizing filter which concerns on embodiment of this invention. The figure which shows the evaluation result of the deodorizing filter which concerns on Example 1 of this invention. The figure which shows the sensory test result of the same deodorizing filter. The figure which shows the sensory test result of the deodorizing filter which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tea leaf 2 Powdery tea leaf 3 Low melting point polymer 5 Granular tea containing molding 6 Granular activated carbon 7 Deodorant 8 Fabric 9 Deodorizing filter

Claims (2)

The size of the oolong tea that has been pulverized and powdered in a dry state is mixed and heated to a low melting point polymer having a melting point of 150 degrees Celsius or less so that the weight ratio is 20 to 70%. and molded into a tea-containing molded article of the particulate as the bulk specific gravity is substantially equal to the size and bulk density of the granular activated carbon to mix the tea-containing molded article molded into the particulate in the particulate activated carbon, in a weight proportion Deodorizer mixed to 1 to 20%.   A deodorizing filter obtained by filling a bag-shaped fabric with the deodorizing agent according to claim 1.

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