JP2019018154A - Filter body for water purification and water purifier - Google Patents

Abstract

To provide a filter body for water purification and a water purifier at high levels of all of adsorption performance, turbidity removal performance, and clogging performance.SOLUTION: A water purification filter body 10 has a water purification part 12 on a side surface part of a hollow cylindrical member 11, in which the water purification part contains 90 to 95 parts by weight of activated carbon adsorbent and 10 to 5 parts by weight of fibrillated acrylic fiber binder, and the activated carbon adsorbent is composed of granular activated carbon having an average particle size of 100 to 250 μm and fibrous activated carbon having an average fiber length of 300 to 600 μm and the granular activated carbon and fibrous activated carbon are mixed at a weight ratio of 10:90-90:10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a filter body for water purification and a water purifier equipped with the filter body for water purification.

  Conventionally, activated carbon having a porous structure has been widely used for water purification and gas purification, taking advantage of its adsorptivity to the porous structure. As an application example of activated carbon, for example, a filter body for water purification obtained by adding a fibrillated hot-melt polyethylene fiber and an acrylic fiber binder to an adsorbent made of granular activated carbon is known (for example, Patent Document 1). reference).

  This water purification filter body is made by adsorbing adsorbent, heat-melting polyethylene fiber, and acrylic fiber binder in water to form a mixed slurry, and adhering the mixed slurry while sucking it from the side of the hollow cylindrical member. Thus, the adsorbed adherend is heated and dried to melt the heat-meltable polyethylene fiber.

  Since this filter body for water purification contains fibrillated heat-meltable polyethylene fibers in addition to the acrylic fiber binder, these can be melted and the constituent materials can be joined together to form a tough filter body Can do. Moreover, this kind of filter body for water purification can be effectively utilized, for example, in a water purifier for removing residual components and foreign matters from drinking water such as tap water.

  In recent years, there has been a demand for higher performance of water purifiers, and in particular, there is a growing demand for ensuring a high level in all of adsorption performance, turbidity removal performance, and clogging performance. Therefore, various studies have been made on the optimum constituent material of the filter body for water purification used in the water purifier.

JP 2012-61390 A

  This invention is made | formed in view of the said point, and provides the filter body for water purification and water purifier of the high level of all of adsorption performance, turbidity removal performance, and clogging performance.

  That is, 1st invention is a filter body for water purification which provided the water purification part in the side part of the hollow cylinder member, Comprising: The said water purification part is 90-95 weight part of activated carbon adsorbents, and the fibrillated acrylic fiber binder 10 is provided. The activated carbon adsorbent is composed of granular activated carbon having an average particle diameter of 100 to 250 μm and fibrous activated carbon having an average fiber length of 300 to 600 μm, and the granular activated carbon and the fibrous activated carbon Is a water-purifying filter body characterized by being blended at a weight ratio of 10:90 to 90:10.

  2nd invention concerns on the water purifier characterized by mounting the filter body for water purification as described in 1st invention in the housing.

  According to the filter body for water purification which concerns on 1st invention, it is a filter body for water purification provided with the water purification part in the side part of the hollow cylinder member, Comprising: The said water purification part is 90-95 weight part of activated carbon adsorbents, and fibrillation The activated carbon adsorbent comprises granular activated carbon having an average particle diameter of 100 to 250 μm and fibrous activated carbon having an average fiber length of 300 to 600 μm. Since the fibrous activated carbon is blended at a weight ratio of 10:90 to 90:10, it is possible to ensure a high level in all of the adsorption performance, turbidity removal performance, and clogging performance.

  According to the water purifier which concerns on 2nd invention, since the filter body for water purification as described in 1st invention was mounted in the housing, a water purifier with a high level of all of adsorption performance, turbidity removal performance, and clogging performance is provided. can do.

It is a perspective view of the filter body for water purification which concerns on this invention. It is the whole water purifier using the filter body for water purification of the present invention. It is a schematic process drawing which shows the manufacturing process of the filter body for water purification.

  A filter body 10 for water purification shown in FIG. 1A is a filter for adsorbing and removing residual components and foreign matters in a liquid such as tap water, and includes a hollow cylindrical member 11 and a water purification unit 12. It consists of a cylindrical structure. This cylindrical structure is a form in which the surface area of the water-purifying filter body 10 can be most advantageously used during liquid flow and the liquid can pass through evenly. When the water purification filter body 10 is sold or used, the surface of the water purification unit 12 is covered and protected by a highly permeable cloth 13 such as a nonwoven fabric as shown in FIG. In FIG.1 (b), the code | symbol 14 is a cap which protects the upper and lower sides of the water purification part 12. FIG.

  The hollow cylinder member 11 is a core material having an appropriate transmission hole. Although the hollow cylinder member 11 is appropriate depending on the application and the like, it may be left in the filter body 10 or removed in the usage pattern shown in FIG. From the viewpoint of shape retention of the filter body 10, the hollow cylinder member 11 is preferably left in the filter body 10.

  The water purification part 12 is a member which becomes the main body of the filter body 10 for water purification, Comprising: As shown to Fig.1 (a), it aggregates to the side part of the hollow cylinder member 11. FIG. The water purification unit 12 has a filtering ability and contains an activated carbon adsorbent and an acrylic fiber binder.

  The activated carbon adsorbent is composed of granular activated carbon having an average particle diameter of 100 to 250 μm and fibrous activated carbon having an average fiber length of 300 to 600 μm, and the granular activated carbon and the fibrous activated carbon are blended at a weight ratio of 10:90 to 90:10. The

  Granular activated carbon is a carbide that has been heated and fired at 800 to 1000 ° C. using wood, coal, coconut shell, etc. as a raw material, and has developed pores by appropriate activation. Granular activated carbon is relatively inexpensive and has excellent moldability and shape retention. The granular activated carbon is sieved to an average particle size of 100 to 250 μm, more preferably 110 to 221 μm, using a sieve or the like. When the average particle size is less than 100 μm, the particles become too small and clogging is likely to occur. When the average particle diameter is larger than 250 μm, the particles become too large and the surface area is relatively reduced, so that the adsorption rate is lowered. In addition, an average particle diameter is an average value at the time of measuring using a laser light scattering type particle size distribution measuring apparatus (SALD-3000S by Shimadzu Corporation).

  Fibrous activated carbon is a carbonized and activated material made from resin fibers such as phenol resin and acrylic resin, or regenerated fibers such as cellulose fibers. In the fibrous activated carbon, the fibers are entangled with each other irregularly to form an appropriate gap, so that a good adsorption performance can be obtained. When the average fiber length of the fibrous activated carbon is less than 300 μm, the fibers are short and appropriate voids cannot be obtained, and clogging is likely to occur. When the average fiber length is longer than 600 μm, the surface area is relatively reduced for the blending amount, which is not preferable from the viewpoint of improving the adsorption capacity. Therefore, an average fiber length is 300-600 micrometers, More preferably, it is the range of 324-582 micrometers. The average fiber length is based on the test method described in JIS P 8226-2 (2011) Part 2: Non-polarization method and measured using a fiber measuring machine (L & W fiber tester manufactured by Lorentzen & Wettre). Average value.

  In the activated carbon adsorbent, by adding granular activated carbon and fibrous activated carbon, granular activated carbon is entangled and densified with fibrous activated carbon, so that resistance to deformation is obtained. In addition, by blending granular activated carbon and fibrous activated carbon in an appropriate ratio of 10:90 to 90:10, excellent performance is exhibited in all of adsorption performance, turbidity removal performance, and clogging performance. The

  However, if the weight ratio of granular activated carbon is extremely small (the weight ratio of fibrous activated carbon is extremely large) or the weight ratio of granular activated carbon is extremely large (the weight ratio of fibrous activated carbon is extremely small), adsorption Any of performance, turbidity removal performance, and clogging performance may be insufficient. That is, it becomes difficult to realize balanced performance when the water purification filter body 10 is configured. According to the inventor's prototype, when the weight ratio of granular activated carbon is less than 10 (weight ratio of fibrous activated carbon exceeds 90), the adsorption performance and turbidity removal performance are reduced, and the weight ratio of granular activated carbon is 90. When it exceeds (weight ratio of fibrous activated carbon is less than 10), it is based on the knowledge that the clogging performance is reduced. Therefore, the weight ratio between the granular activated carbon and the fibrous activated carbon is significant.

  The acrylic fiber binder is a fibrillated synthetic resin fiber that is integrated by entwining the activated carbon adsorbent through fiber fluffing (fibrillation). That is, since the granular activated carbon and the fibrous activated carbon of the activated carbon adsorbent are held in the entanglement of the fibers of the acrylic fiber binder, the shape retention is improved. Moreover, since the acrylic fiber binder is excellent in the durability of the resin, the service life of the water purification filter body can be extended.

  In the water purification unit 12, the mixing ratio of the activated carbon adsorbent and the acrylic fiber binder is 10 to 5 parts by weight of the acrylic fiber binder with respect to 90 to 95 parts by weight of the activated carbon adsorbent. When the activated carbon adsorbent is less than 90 parts by weight (the acrylic fiber binder exceeds 10 parts by weight), the components other than the activated carbon are excessive and the adsorption performance due to the activated carbon is not exhibited. In addition, when the amount of the activated carbon adsorbent exceeds 95 parts by weight (the acrylic fiber binder is less than 5 parts by weight), the proportion of the activated carbon adsorbent increases, so that the fibrillated acrylic fiber binder decreases and the binding property between the activated carbons increases. Decreases and shape retention deteriorates.

  As shown in FIG. 2, this water purifier filter body is preferably used as a filter medium of the water purifier 1 and mounted in the housing 4 of the water purifier 1. The water purifier 1 includes a main body 2 that is attached to the tip of the faucet 5, a switching lever 3 that switches between purified water and non-purified water, and a housing 4 in which a water purification filter body 10 is loaded in a replaceable manner. In the water purifier 1, necessary members such as an ion exchanger, a hollow fiber filter, and a flow meter (not shown) are appropriately provided. The form of the water purifier 1 is not limited to the illustrated example and can be applied to various devices. The water purification filter body 10 loaded in the water purifier 1 is preferably a cartridge type so that it can be easily exchanged, and naturally it can be applied to a stationary type or an apparatus with a larger filtration capacity. Is possible.

  Next, the manufacturing process of the filter body for water purification is demonstrated using FIG. In this figure, reference numeral 20 is a filter body manufacturing apparatus, 21 is a water tank filled with water W, 22 is a stainless steel rod member having a large number of pores, and 25 is a dryer.

  First, granular activated carbon 31 and fibrous activated carbon 32 as materials for the activated carbon adsorbent and a fibrillated acrylic fiber binder 33 are prepared. These are put into the water W filled in the water tank 21 and mixed sufficiently to prepare the mixed slurry 30.

  Next, the mold rod-shaped member 22 is inserted into the hollow cylinder member 11, and the integrated product 23 of the hollow cylinder member 11 and the mold rod-shaped member 22 is put into a water tank 21 filled with the mixed slurry-like material 30. The Then, the mixed slurry 30 is attracted to the side surface of the hollow cylinder member 11 by suctioning the pressure within the water tank 21 through the die rod member 22. In addition, a nonwoven fabric etc. are wound around the hollow cylinder member 11 as needed.

  Here, since the permeation hole of the hollow cylinder member 11 is smaller than the granular activated carbon or the like, only the moisture of the mixed slurry 30 passes through the hollow cylinder member 11 and is sucked out from the die bar member 22, so that the granular activated carbon or the like The component 36 of the water purification unit 12 remains on the surface of the hollow cylindrical member 11 without passing. Thus, the component 36 of the water purification unit 12 is accumulated on the surface of the hollow cylindrical member 11 as a slurry adherence portion 37 to a predetermined thickness, and the suction of the mixed slurry 30 is terminated.

  After a predetermined amount of the slurry depositing portion 37 is formed, the hollow cylindrical member 11 is pulled up from the water tank 21 and the mold bar-shaped member 22 is removed. In this way, the adsorbed adherend 35 having the slurry adhering portion 37 on the surface of the hollow cylindrical member 11 is obtained. Thereafter, the adsorbed adherend 35 is heated and dried in the dryer 25 to complete the filter body for water purification.

  Next, using granular activated carbon and fibrous activated carbon as the material of the activated carbon adsorbent, changing the average particle diameter of granular activated carbon, the average fiber length of fibrous activated carbon, the blending ratio of granular activated carbon and fibrous activated carbon, It mixed with the acrylic fiber binder and the filter body for water purification of Prototype Examples 1-22 was produced.

[Materials used]
As granular activated carbon, “CW-Z” manufactured by Phutamura Chemical Co., Ltd. was used, and sieved to average particle sizes of 73 μm, 110 μm, 143 μm, 221 μm, and 259 μm. As the fibrous activated carbon, “Phenol resin-based fibrous activated carbon” manufactured by Futamura Chemical Co., Ltd. was used, and the fiber length was cut to an average fiber length of 285 μm, 324 μm, 582 μm, and 625 μm. “Bipal” manufactured by Toyobo Co., Ltd. was used as an acrylic fiber binder.

[Preparation of water filter body]
According to the materials and blends (unit: parts by weight) based on Table 1 to Table 3, granular activated carbon, fibrous activated carbon, and acrylic fiber binder are dispersed in water and mixed well in water until homogeneous to make prototypes 1 to 22 A mixed slurry corresponding to was prepared. The water in the mixed slurry was 50 times the added solid content. Then, a hollow cylindrical member made of polypropylene having an outer diameter of 34 mm, an inner diameter of 30 mm, a total length of 60 mm, and pores having a diameter of 2 mm was prepared. Moreover, the nonwoven fabric was wound around the outer surface of the hollow cylinder member. A porous stainless steel mold rod-like member is inserted and fixed in the hollow cylindrical member, and is put into a mixed slurry-like material, and the mixed slurry-like material is sucked under reduced pressure (suction pressure is about -0.08 MPa). The solid content was drawn from the inside, and about 15 mm of the purified water component was deposited on the surface of the hollow cylindrical member (slurry coating portion). The die rod-shaped member was removed from the hollow cylinder member, and an adsorbed adherend that was an integrated product of the slurry adherend and the hollow cylinder member was obtained. Then, the adsorbed adherend was heated and dried using a dryer at 100 ° C. for 12 hours to produce a purification filter body of a prototype example. The size of each filter body is a cylindrical body having a diameter of 60 mm and a total length of 60 mm including a hollow cylinder member. Further, the surface of the filter body was covered with a nonwoven fabric made of a mixed fiber of polyethylene and polypropylene, and caps made of polypropylene were attached to the upper and lower sides of the filter body.

[Evaluation item]
The prototype water purification filter body was evaluated according to free residual chlorine filtration performance, turbidity removal performance, and clogging performance as follows, and the quality of each was examined.

<Free residual chlorine filtration performance>
In order to evaluate adsorption | suction performance, it tested based on the household water purifier test method of JISS3201 (2010). As shown in Table 1, each of the purification filter bodies of Prototype Examples 1 to 12 was evaluated. In this test, the concentration of free residual chlorine was set to 2 mg / L, the water flow rate was set to 3.6 L / min, and the total water flow rate until the removal rate reached 80% was measured. In the evaluation, a total water flow rate of 5000 L or more was judged as “good” as a non-defective product, and less than 5000 L was judged as “bad” as a defective product.

<Turbidity removal performance>
As shown in Table 2, collection of kaolin (manufactured by Nacalai Tesque Co., Ltd.) for the purification filter bodies of Prototype Examples 13 to 19 in accordance with the turbid filtration ability test of JIS S 3201 (2010). The turbidity removal rate was measured from the rate. In this test, water flow was continued even when the removal rate was 80% or less. In the evaluation, a collection rate of 50% or more was evaluated as “good” as a non-defective product, and less than 50% was evaluated as “x” as a defective product.

<Clogging performance>
As shown in Table 3, according to the turbid filtration ability test of JIS S 3201 (2010) for each of the purification filter bodies of Prototype Examples 20 to 32, kaolin is collected and the flow rate is halved (1.8 L / min) until the total water flow rate was measured. In the evaluation, a total water flow rate of 3000 L or more was judged as “good” as a non-defective product, and less than 3000 L was judged as “x” as a defective product.

[Results and discussion]
Table 4 shows the average particle diameters (73 μm, 110 μm, 143 μm, 221 μm, 259 μm) of the granular activated carbons of Prototype Examples 1 to 22 and the average fiber lengths (285 μm, 324 μm, 582 μm, 625 μm) of the fibrous activated carbons of Prototype Examples 1 to 22. The distribution of prototype examples 1 to 30 in relation to In Table 4, each prototype is represented by a number in parentheses (for example, [1]).

  In the results of the free residual chlorine filtration performance disclosed in Table 1, prototype examples 1 to 7 were non-defective products and prototype examples 8 to 12 were defective products. In the results of the turbidity removal performance disclosed in Table 2, prototype examples 13 to 19 were non-defective products. As a result of the clogging performance disclosed in Table 3, prototype examples 20 to 27 were non-defective products and prototype examples 28 to 32 were defective products. Considering the distribution of the prototypes shown in Table 4 based on the results disclosed in Tables 1 to 3, the prototype of the non-defective product is that the average particle diameter of the granular activated carbon is 110 μm, 143 μm, or 221 μm, and the fibrous activated carbon The average fiber length of 324 μm or 582 μm was satisfied (within the thick frame in Table 4). On the other hand, a prototype of a defective product is a part that does not satisfy the above conditions (outside the thick frame in Table 4), and the average particle diameter of granular activated carbon is 73 μm, 259 μm, or the average fiber length of fibrous activated carbon is 285 μm, 625 μm Either condition was included.

  From the results disclosed in Tables 1 to 4, in the configuration of the activated carbon adsorbent that affects the performance of the filter body for water purification, the average particle diameter of the granular activated carbon and the average fiber length of the fibrous activated carbon are the adsorption performance, turbidity of the filter body. It was found that it greatly contributes to the removal performance and clogging performance. That is, for the optimum conditions of the material constituting the activated carbon adsorbent, the average particle diameter of granular activated carbon is 100 to 250 μm, more preferably 110 to 221 μm, and the average fiber length of fibrous activated carbon is 300 to 600 μm, more preferably 324 to 582 μm.

  As described above, the filter body for water purification of the present invention has excellent adsorption performance by adjusting the average particle diameter of the granular activated carbon constituting the activated carbon adsorbent and the average fiber length of the fibrous activated carbon under optimum conditions. In addition, both turbidity removal performance and clogging performance can be achieved. Therefore, it is possible to provide a filter body for water purification having a high level of adsorption performance, turbidity removal performance, and clogging performance. Moreover, by mounting this water purifier filter body in the water purifier housing, it is possible to provide a water purifier having a high level of adsorption performance, turbidity removal performance, and clogging performance.

  The filter body for water purification of the present invention is excellent in all of adsorption performance, turbidity removal performance, and clogging performance, and can be suitably used as a filter medium for a water purifier. Moreover, since this filter body is mounted, the water purifier of this invention can exhibit the more excellent water purifying performance. Therefore, it is promising as an alternative to conventional filter bodies for water purification and water purifiers.

DESCRIPTION OF SYMBOLS 1 Water purifier 2 Main-body part 3 Switching lever 4 Housing 5 Faucet 10 Filter body for water purification 11 Hollow cylinder member 12 Water purification part 13 Cloth-like material 14 Cap 20 Filter body manufacturing apparatus 21 Water tank 22 Mold rod-shaped member 23 Hollow cylinder member and gold Integrated product of rod-shaped members 25 Dryer 30 Mixed slurry-like material 31 Granular activated carbon 32 Fibrous activated carbon 33 Acrylic fiber binder 35 Adsorbed deposit 36 Water purification component 37 Slurry deposit W Water

Claims (2)

It is a filter body for water purification provided with a water purification part on the side surface of the hollow cylinder member,
The water purification part comprises 90 to 95 parts by weight of an activated carbon adsorbent and 10 to 5 parts by weight of a fibrillated acrylic fiber binder,
The activated carbon adsorbent comprises granular activated carbon having an average particle diameter of 100 to 250 μm and fibrous activated carbon having an average fiber length of 300 to 600 μm.
The granular activated carbon and the fibrous activated carbon are blended at a weight ratio of 10:90 to 90:10.   A water purifier comprising the filter body for water purification according to claim 1 mounted in a housing.

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