JP2019084469A - Water purification filter body - Google Patents

Abstract

To provide a water purification filter body that can reduce an outflow of impalpable powder derived from a powdery adsorbent during water conduction with a filter body containing the powdery adsorbent.SOLUTION: A filter body has base activated carbon, a powdery adsorbent, and a fibrillated fiber binder, the base activated carbon having an average particle size of 25-160 μm, the powdery adsorbent having an average particle size of 3-20 μm, and a paper durability enhancer being added thereto. The amount of the added paper durability enhancer is 1-20 pts.wt. relative to 100 pts.wt. of the powdery adsorbent.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water purification filter body comprising a base activated carbon, a powdered adsorbent and a fibrillated fiber binder.

  In a filter body attached to a water purifier or the like, activated carbon having an adsorption performance by a porous structure is used as a main material. In this type of filter body, for example, a water purification filter body is known in which a base activated carbon comprising fibrous activated carbon and powdered activated carbon is integrated by a fibrillated fiber binder (see, for example, Patent Document 1). The water purification filter body is excellent in durability and shape retention since the fibrillated fiber binder entangles and integrates the fibrous activated carbon and the powdered activated carbon. In the filter body of this type, as the base activated carbon, granular activated carbon can be used in addition to fibrous activated carbon and powdered activated carbon.

  In recent years, there is a demand for higher performance of water purifiers, and in order to more reliably remove foreign substances such as residual components and fine insolubles contained in drinking water such as tap water, improvement of the water purification filter body by various methods Is being considered. For example, the adsorption performance can be easily improved by forming a filter body by mixing a powdery adsorbent with finer particles in addition to the powdered activated carbon or the granular activated carbon.

  However, in the above-mentioned water purification filter body, since the powdery adsorbent is extremely fine particles, fine powder derived from the adsorbent tends to flow out at the initial stage of water flow. Therefore, there is a demand for a water purification filter body that can reduce the outflow of fine powder when water flows when a fine adsorbent for improving adsorption performance is used.

Unexamined-Japanese-Patent No. 2016-22399

  The present invention is made in view of the above-mentioned point, and provides a purified water filter body capable of reducing the outflow of fine powder derived from the powdery adsorbent at the time of water passing through the filter body containing the powdery adsorbent. It is a thing.

  That is, the first invention is a filter body comprising a base activated carbon, a powdered adsorbent and a fibrillated fiber binder, wherein the base activated carbon has an average particle diameter of 25 to 160 μm, and the powdery form The average particle diameter of the adsorbent is 3 to 20 μm, and a paper strengthening agent is added to the water purification filter body.

  A second invention relates to the purified water filter body according to the first invention, wherein the powdered adsorbent is activated carbon.

  A third invention relates to the purified water filter body according to the first invention, wherein the powdery adsorbent is at least one selected from zeolite, titanium silicate or sodium titanate.

  In a fourth invention, the water purification filter body according to any one of the first to third inventions, wherein the paper strengthening agent is added in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the powdery adsorbent. Pertain to.

  A fifth invention relates to the purified water filter body according to any one of the first to fourth inventions, wherein a weight ratio of the powdery adsorbent occupied in the filter body is 0.5 to 30 parts by weight.

  A sixth invention relates to the water purification filter body according to any one of the first to fifth inventions, wherein the paper strength agent contains a cationic wet paper strength agent.

  According to the water purification filter body of the first aspect of the invention, there is provided a filter body comprising a base activated carbon, a powdered adsorbent and a fibrillated fiber binder, wherein the base activated carbon has an average particle diameter of 25 to 160 μm. The average particle diameter of the powdery adsorbent is 3 to 20 μm, and a paper-strengthening agent is added, so that it is possible to significantly reduce the outflow of fine powder derived from the powdery adsorbent during water passage.

  According to the water purification filter body of the second aspect of the invention, in the first aspect of the invention, since the powdered adsorbent is activated carbon, the adsorption performance of the filter body can be easily improved.

  According to the water purification filter body of the third invention, in the first invention, since the powdery adsorbent is at least one selected from zeolite, titanium silicate or sodium titanate, metal ions in the liquid are It becomes possible to remove appropriately.

  According to the water purification filter body of the fourth aspect of the invention, in the first to third aspects of the invention, since the paper strengthening agent is added in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the powdery adsorbent, As well as ensuring the properties, it is possible to appropriately reduce the outflow of fine powder.

  According to the water purification filter body of the fifth invention, in the first to fourth inventions, the weight ratio of the powdery adsorbent occupied in the filter body is 0.5 to 30 parts by weight, so that excellent adsorption performance can be obtained. While being obtained, moldability can be secured.

  According to the water purification filter body of the sixth invention, in the first to fifth inventions, the paper strengthening agent contains a cationic wet paper strengthening agent, so it is easy to be combined with the powdery adsorbent, and the outflow of fine powder is further enhanced. It can be reduced.

It is a perspective view of a purified water filter object concerning one embodiment of the present invention. It is a schematic process drawing which shows the manufacturing process of a purified water filter body.

  The water purification filter body of the present invention is a filter for purifying a liquid such as tap water, and comprises a base activated carbon, a powdered adsorbent and a fibrillated fiber binder, and a paper strength agent is added Become.

  The base activated carbon is an activated carbon obtained by using petroleum pitch, resin particles, trees, coconut shells, old tires and the like as a raw material, heating and firing at 800 to 1000 ° C. to activate appropriately to develop pores and pulverize. The base activated carbon is provided with the adsorption performance of general activated carbon required for water purification. Specifically, in the measurement according to JIS K 1474 (2014), the iodine adsorption performance of 1000 to 2000 mg / g is satisfied.

  The base activated carbon is a main raw material constituting the filter body, and powdered activated carbon or granular activated carbon is used. By using powdered activated carbon or granular activated carbon as the base activated carbon, the surface area per unit weight can be increased to enhance the filtration ability. The base activated carbon which is powdered activated carbon or granular activated carbon has an average particle diameter of 25 to 160 μm by classification or sieving from the viewpoint of adsorption performance, formability, and the like. When the average particle diameter of the base activated carbon is less than 25 μm, the formation of the filter body becomes difficult, and problems such as increase in hydrodynamic pressure when flowing water and clogging tend to occur. In addition, when the average particle diameter of the base activated carbon is larger than 160 μm, the particle collection rate decreases as the particle diameter increases, and the surface area of the activated carbon decreases to lower the adsorption performance. In addition, the measurement of the average particle diameter adopts the particle diameter at an integrated value of 50% in the particle size distribution determined by the laser diffraction / scattering method using a laser diffraction particle size distribution measuring device (SALD-3000S manufactured by Shimadzu Corporation) did.

  The powdery adsorbent is a powdery material having adsorption performance, and the adsorption performance of the filter body is improved by forming the fine particles from the base activated carbon. The average particle size of the powdered adsorbent is 3 to 20 μm. When the average particle size of the powdery adsorbent is less than 3 μm, the particle size becomes too fine and it is easy for the water purification filter body to flow out. In addition, when the average particle diameter of the powdery adsorbent is larger than 20 μm, it is difficult to sufficiently improve the adsorption performance since the advantage of particles finer than the base activated carbon is lost.

  The material used in the powdered adsorbent is at least one selected from activated carbon, zeolite, titanium silicate or sodium titanate. Since activated carbon is excellent in physical adsorption performance, the adsorption performance of fine particles and the like can be easily improved by forming it into a finer particle size than the base activated carbon which is the main raw material of the filter body and adding it. . In addition, zeolite, titanium silicate and sodium titanate are also excellent in chemical adsorption performance, so that they can adsorb metal ions in liquid. Therefore, it is possible to appropriately remove metal ions such as soluble lead.

  The powdery adsorptive material has a weight ratio of 0.5 to 30 parts by weight in the filter body from the viewpoint of adsorption performance, moldability and the like. When the weight proportion of the powdery adsorbent is less than 0.5 parts by weight, it becomes difficult to exhibit sufficient adsorption performance by the powdery adsorbent. If the proportion by weight of the powdery adsorbent is more than 30 parts by weight, the formability deteriorates.

  The fibrillated fiber binder is a material in which synthetic resin fibers such as acrylic fibers, aramid fibers and polyethylene fibers are fluffed (fibrillated). In the fibrillated fiber binder, the base activated carbon and the powdered adsorbent are entangled and integrated by fibrillation of the fibers. Since the resin of the binder is excellent in durability and chemical resistance, the service life of the filter body can be further extended.

  Paper strength agents are agents for holding powdered adsorbents. The paper strengthening agent is considered to hold hydrogen bonding with the powdery adsorbent. As the paper strengthening agent, a wet paper strengthening agent such as polyamide polyamine epichlorohydrin resin, melamine formaldehyde resin, urea formaldehyde resin, etc. having water resistance is preferably used. In particular, it is more preferable to include a cationic wet strength agent such as polyamide polyamine epichlorohydrin resin. The cationic wet strength agent is more easily bound to the powdered adsorbent by being charged on the positive electrode.

  The paper strengthening agent is added in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the powdery adsorbent from the viewpoints of moldability and difficulty in generating fine powder. When the addition amount of the paper strengthening agent is less than 1 part by weight with respect to 100 parts by weight of the powdery adsorbent, it becomes difficult to sufficiently hold the powdery adsorbent. When the addition amount of the paper strengthening agent is more than 20 parts by weight with respect to 100 parts by weight of the powdery adsorbent, the shape retention property of the filter body is reduced and it becomes difficult to form.

  The shape of the filter body is not particularly limited and is appropriate. For example, as the water purification filter body 10 shown to Fig.1 (a), it is formed as the filter material 12 of the cylindrical structure aggregated on the side part of the hollow cylinder member 11. As shown in FIG. The hollow cylindrical member 11 is a core material having an appropriate transmission hole, and may be left or removed depending on the application or the like. From the viewpoint of shape retention of the filter body 10, the hollow cylindrical member 11 is preferably left in the filter body 10.

  This cylindrical structure is a form that the surface area can be most advantageously used when water flows, and the liquid can pass evenly. As shown in FIG. 1 (b), the surface of the water purification filter body 10 is covered and protected by a highly permeable cloth-like material 13 such as a non-woven fabric at the time of sale or use. In FIG. 1 (b), reference numeral 14 is a cap for protecting the upper and lower sides of the filter body 10.

  This water purification filter body is suitably used, for example, as a filter material for a water purifier. It is preferable to use a cartridge type water purification filter body, which is loaded as a filter material in the water purifier, in order to be easily replaceable. The cartridge type water purification filter body can be applied not only to household water purifiers, but also to stationary type and large sized equipment with enhanced filtration capacity.

  Next, the manufacturing process of the purified water filter body will be described with reference to FIG. In this figure, the reference numeral 20 denotes a filter body manufacturing apparatus, 21 denotes a water tank filled with water W, 22 denotes a stainless steel mold rod member having a large number of pores formed therein, and 25 denotes a dryer.

  First, a base activated carbon 31 which is powdered activated carbon or granular activated carbon, a powdered adsorbent 32, a fibrillated fiber binder 33, and a paper strength enhancer 34 are prepared. These are introduced into the water W filled in the water tank 21 and thoroughly mixed to prepare a mixed slurry 30.

  Next, the mold rod 22 is inserted into the hollow cylindrical member 11, and the integral 23 of the hollow cylindrical member 11 and the mold rod 22 is introduced into the water tank 21 filled with the mixed slurry 30. Ru. Then, the mixed slurry 30 is drawn to the side surface of the hollow cylindrical member 11 by reducing pressure suction through the mold rod member 22 in the water tank 21. In addition, a nonwoven fabric etc. are wound around the hollow cylindrical member 11 as needed.

  Here, since the transmission holes such as non-woven fabric wound around the hollow cylindrical member 11 are smaller than the base activated carbon, the powdery adsorptive material, etc., only the moisture of the mixed slurry 30 passes through the hollow cylindrical member 11 to be gold The component 36 of the filter medium 12 is left on the surface of the hollow cylindrical member 11 by being sucked out from the mold rod 22 and the base activated carbon, the powdery adsorbent and the like can not pass through. Thus, the component 36 of the filter medium 12 is accumulated on the surface of the hollow cylindrical member 11 as the slurry adhering portion 37 to a predetermined thickness, and the suction of the mixed slurry 30 is ended.

  After the predetermined amount of the slurry-adhered portion 37 is formed, the hollow cylindrical member 11 is pulled up from the inside of the water tank 21, and the mold rod member 22 is removed. In this way, the adsorption deposition object 35 provided with the slurry deposition part 37 on the surface of the hollow cylindrical member 11 is obtained. Thereafter, the adsorption deposited matter 35 is heated and dried in the dryer 25 to complete the purified water filter body.

  Next, using a plurality of types of base activated carbon and powdered adsorbent, the blending ratio of the paper strength agent is changed, the fibrillated fiber binder is mixed, and the purified water of trial examples 1 to 19 and comparative examples 1 to 12 is mixed. A filter body was produced.

[Material used]
<Base activated carbon>
As the base activated carbon, activated carbon 1 having an average particle diameter of 20 μm (“CN20MS” manufactured by Futamura Chemical Co., Ltd.), activated carbon 2 having an average particle diameter of 29 μm (“CN30MS” manufactured by Futamura Chemical Co., Ltd.), activated carbon 3 having an average particle diameter of 98 μm (Futamura "CN 100 MS" manufactured by CHEMICAL CO., LTD., Activated carbon 4 with an average particle diameter of 158 μm ("CN 8200 S" manufactured by Futamura Chemical Co., Ltd.), or activated carbon 5 with an average particle diameter of 220 μm ("CN 480 S" manufactured by Futamura Chemical Co., Ltd.) . The average particle size of each base activated carbon was sieved and prepared.

<Powder like adsorbent>
The powdery adsorbent is activated carbon with an average particle diameter of 20 μm ("CB" manufactured by Futamura Chemical Co., Ltd.), sodium trititanate with an average particle diameter of 3 μm ("Na trititanate" manufactured by Futamura Chemical Co., Ltd.), an average particle diameter of 8 μm Of Zeolite ("Zeolam (registered trademark) F-9 powder 100" manufactured by Tosoh Corp.) or titanium silicate having an average particle diameter of 12 .mu.m ("ATS" manufactured by BASF Japan Ltd.). The average particle size of each powdery adsorbent was prepared by sieving.

<Fibrillated fiber binder, paper strength agent>
As a fibrillated fiber binder, an acrylic fiber ("BIPAL (registered trademark)" manufactured by Toyobo Co., Ltd.) was used. Paper strength agents are cationic wet paper strength agents such as polyamidepolyamine-based wet paper strength agents (Arakawa Chemical Industry Co., Ltd., “Arafix 255 LOX”), and anionic dry paper strength agents (Arakawa Chemical Co., Ltd.) Product "Polystron 145" was used.

[Production of purified water filter body]
Base activated carbon, powdery adsorbent, fibrillated fiber binder, paper strengthening agent are dispersed in water according to the below-mentioned composition (unit: weight part), sufficiently mixed in water until homogeneous, and trial examples 1 to 19 And the mixed slurry-like thing corresponding to Comparative Examples 1-12 was prepared. Water in the mixed slurry was 50 times the weight of the added solid content. Then, a hollow tubular member made of polypropylene having pores with an inner diameter of 20 mm, an outer diameter of 24 mm, a total length of 50 mm and a diameter of 2 mm was prepared. Moreover, the nonwoven fabric was wound around the outer surface of the hollow cylinder member. In the same hollow cylindrical member, a porous stainless steel mold-like rod member is inserted and fixed, and it is introduced into the mixed slurry, and the mixed slurry is drawn by reduced pressure suction (the suction pressure is about -0.08 MPa) The solid content was drawn from the inside, and the filter medium component was adhered to about 10.5 mm on the surface of the hollow cylindrical member (slurry adhered part). The mold rod-like member was removed from the hollow cylindrical member to obtain an adsorption-deposited material which was an integrated product of the slurry-coated portion and the hollow cylindrical member. Then, the adsorptive material was heated and dried at 100 ° C. for 12 hours using a drier to prepare a filter body for purification of a prototype example. The dimensions of each filter body are a cylindrical body having a diameter of 45 mm and a total length of 50 mm including a hollow cylindrical member. Further, the surface of the filter body was covered with a non-woven fabric made of mixed fibers of polyethylene and polypropylene, and polypropylene caps were attached to the upper and lower sides of the filter body.

[Evaluation item]
With respect to the purified water filter bodies of Trial Examples 1 to 19, the comparison of the content of the paper strength agent, the comparison of the type of the paper strength agent, the comparison of the particle diameter of the base activated carbon and the type of the powdered adsorbent The evaluations were carried out according to the fine powder reduction performance test, the free residual salt removal performance test, and the soluble lead removal performance test with respect to the comparison of the above and the comparison of the content of the powdery adsorbent, and the quality was examined.

Fine powder reduction performance test
In order to evaluate the fine powder reduction performance, a test was conducted based on a filter body (Comparative Examples 1 to 12) to which no paper strength agent was added. In this test, the water flow rate was set to 2.0 L / min, and 200 mL of the water initial stage was collected and measured. The measurement was carried out using a photoelectric spectrophotometer and at a measurement wavelength of 660 nm in a 100 mm cell. The fine powder reduction rate of each of trial production examples 1 to 19 was calculated based on the absorbance value of the filter body (comparative examples 1 to 12) to which the paper strength additive was not added (fine powder reduction rate (%) = (1-prototype example) Absorbance value / Absorbance value of Comparative Example) x 100). In the calculation of the fine powder reduction rate, prototype examples 1 to 8 are based on comparative example 1, and prototype example 9 below is comparative example 2, prototype example 10 is comparative example 3, prototype example 11 is comparative example 4, and prototype example 12 is comparative example 5, trial production example 13 is comparative example 6, trial production example 14 is comparative example 7, trial production example 15 is comparative example 8, trial production example 16 is comparative example 9, trial production example 17 is comparative example 10, trial production example 18 is comparative example 11, The trial production example 19 was obtained based on each of the comparative example 12. In the evaluation of the fine powder reduction performance, the fine powder reduction rate is less than 40% as "x" which is a defective product. Further, 40% or more and the point, and 50% or more are more preferable. Therefore, the absorbance was evaluated as “Δ” for 40% or more and less than 50% as “good” for 50% or more.

<Free residual chlorine removal performance test>
In order to evaluate the removal performance of the free residual chlorine, it tested based on the household water purifier test method of JISS3201 (2010). In this test, the concentration of free residual chlorine was set to 2 mg / L, the flow rate of water was set to 2.0 L / min, and the removal rate of free residual chlorine after continuous water flow for 10 minutes was measured. At the time of evaluation, the removal rate of less than 95% was regarded as "x" which is a defective product, and 95% or more as "good product".

<Dissolvable lead removal performance test>
In order to evaluate the metal ion removal performance, the test was conducted according to the domestic water purifier test method of JIS S 3201 (2010). In this test, the concentration of soluble lead was set to 50 μg / L, the flow rate of water was set to 2.0 L / min, and the removal rate of soluble lead after continuous water flow for 10 minutes was measured. At the time of evaluation, the removal rate of less than 95% was regarded as "x" which is a defective product, and 95% or more as "good product".

[Comparison of Paper Strength Enhancer Content]
A filter body comprising 90 parts by weight of the above-mentioned activated carbon 3 as the base activated carbon, 10 parts by weight of titanium silicate having an average particle diameter of 12 μm as the powdery adsorbent, and 6 parts by weight of a fibrillated fiber binder (paper strength agent Was added as Comparative Example 1). Then, paper strength enhancers (polyamide-polyamine based wet paper strength enhancers, the same shall apply hereinafter) were added to the composition of Comparative Example 1 in different addition amounts, to make Prototype Examples 1 to 6.

  In Tables 1 and 2 below, the amount of addition of the paper-strengthening agent is represented by a weight ratio to 100 parts by weight of the powdery adsorbent. That is, the addition amount of the paper-strengthening agent of Prototype Example 1 is 0.5 parts by weight with respect to 100 parts by weight of the powdery adsorbent (0.05 parts by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table) The addition amount of the paper-strengthening agent according to trial example 2 is 1.0 parts by weight with respect to 100 parts by weight of the powdery adsorbent (0.1 parts by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table) The addition amount of the paper strength agent of trial example 3 is 2.0 parts by weight with respect to 100 parts by weight of the powdery adsorbent (0.2 parts by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table), trial The addition amount of the paper strengthening agent of Example 4 was 10 parts by weight with respect to 100 parts by weight of the powdery adsorbent (1 part by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table). The addition amount of the enhancer is 20 parts by weight per 100 parts by weight of the powdery adsorbent (2 parts by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table), a trial example The addition amount of the paper strength agent is 30 parts by weight with respect to powdery adsorbent 100 parts by weight (3 parts by weight with respect to powdery adsorbent 10 parts by weight shown in Table).

[Result and Consideration of Comparison of Paper Strength Enhancer Content]
As shown in Tables 1 and 2, in the trial production example 6, the shape could not be properly maintained and could not be molded when producing the filter body. In the other prototype examples 1 to 5, the formation of the filter body was good. Since the paper strengthening agent was added in excess (30 parts by weight) as compared to the other prototypes 1 to 5 in trial production example 6, the paper strength enhancing agent was used as a condition for obtaining sufficient formability of the filter body. It is considered that 20 parts by weight or less is preferable. In addition, about the trial production example 6, since the shaping | molding of a filter body was not completed, the measurement regarding a fine powder reduction performance test, a free residual chlorine removal performance test, and a soluble lead removal performance test was not implemented.

  Good results were obtained for the free residual chlorine removal performance test and the soluble lead removal performance test for each of Prototype Examples 1 to 5. In the fine powder reduction performance test, the fine powder reduction rate (absorbance) was 44.4% in trial production example 1, and high values of 70% or more were obtained in all of the fine powder reduction rates in trial production examples 2 to 5. Since the fine powder reduction rate of 50% or more is a non-defective product, it is considered that 1.0 weight part or more of the paper strength agent is preferable as a condition for obtaining a good fine powder reduction performance as in Prototype Examples 2 to 5. Therefore, from the conditions of the formability of the filter body and the conditions of the fine powder reduction performance, it has been found that the appropriate content of the paper strengthening agent is 1 to 20 parts by weight.

[Comparison of types of paper strength agents]
In the composition of Comparative Example 1, 1.0 part by weight of an anionic dry paper strengthening agent with respect to 100 parts by weight of the powdery adsorbent (0.1 part by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table) 2. The trial production of Example 7 for the filter body added, and 1.0 part by weight of the cationic wet paper strengthening agent (polyamide polyamine based wet paper strengthening agent) with respect to 100 parts by weight of the powdered adsorbent (powdery adsorption shown in the table) 0.1 parts by weight per 10 parts by weight of the material and 0.5 parts by weight per 100 parts by weight of the powdery adsorptive material (10 parts by weight of the powdery adsorptive material shown in the table) On the other hand, a filter body prepared by mixing and adding 0.05 parts by weight) was designated as Prototype Example 8. In Table 3 below, Comparative Example 1 in which no paper-strengthening agent is added, 1.0 weight to 100 weight parts of the powdery adsorptive material of polyamide polyamine-based wet paper-strengthening agent which is a cationic wet paper-strengthening agent. The trial example 2 which added 1 part (0.1 weight part with respect to 10 weight parts of powdery adsorbents shown to a table | surface) was also listed, respectively.

[Results and Consideration of Comparison of Types of Paper Strength Agents]
As shown in Table 3, in the case of Prototype Example 7 in which the anionic dry paper strengthening agent was used alone as the paper strengthening agent, the reduction rate of fine powder was insufficient. On the other hand, trial production example 2 using the cationic wet paper strengthening agent alone as the paper strengthening agent, or trial production using the cationic wet paper strengthening agent and the anionic dry paper strengthening agent in combination In No. 8, the fine powder reduction rate was good. From this, it was found that good powder reduction performance can be obtained by using a cationic wet paper strengthening agent as a main component for the paper strengthening agent.

[Comparison of particle size of base activated carbon]
A filter body comprising 90 parts by weight of activated carbon 1 having an average particle diameter of 20 μm as a base activated carbon and containing the same composition as in Comparative Example 1 except for that is referred to as Comparative Example 2; A filter body to which 1.0 part by weight (0.1 parts by weight with respect to 10 parts by weight of the powdery adsorptive material shown in the table) is added based on 100 parts by weight of the powdery adsorptive material Is a prototype example 9. A filter body composed of 90 parts by weight of activated carbon 2 having an average particle diameter of 29 μm as the base activated carbon and containing the same composition as in Comparative Example 1 except that is referred to as Comparative Example 3; A filter body in which 1.0 part by weight (0.1 part by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table) was added with respect to 100 parts by weight of the material was used as Prototype Example 10. A filter body consisting of 90 parts by weight of activated carbon 4 with an average particle diameter of 158 μm as the base activated carbon and containing the same composition as in Comparative Example 1 except for that is referred to as Comparative Example 4; A filter body in which 1.0 part by weight (0.1 part by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table) was added with respect to 100 parts by weight of the material was set as a prototype example 11. A filter body composed of 90 parts by weight of activated carbon 5 having an average particle diameter of 220 μm as the base activated carbon and containing the same composition as in Comparative Example 1 except that is referred to as Comparative Example 5; A filter body in which 1.0 part by weight (0.1 part by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table) was added to 100 parts by weight of the material was prepared as a trial example 12. In Table 4 below, Comparative Example 1 and Trial Example 2 in which activated carbon 3 having an average particle diameter of 98 μm was used as the base activated carbon are also listed.

[Results and discussion of comparison of particle size of base activated carbon]
As shown in Tables 4 and 5, in Comparative Example 2 and Prototype Example 9, the shape could not be properly maintained and could not be formed when producing the filter body. In the other comparative examples 1 and 3 to 5 and trial examples 2 and 10 to 12, the formation of the filter body was good. Since the average particle diameter of the base activated carbon is fine (20 μm) in comparison with Comparative Examples 1 to 3 and 2 and 9 to 12 according to Comparative Example 2 and Trial Example 9, the sufficient amount of the filter body is sufficient. As conditions for obtaining such formability, the average particle diameter of the base activated carbon is considered to be preferably 25 μm or more. In addition, about the trial production example 9, since the shaping | molding of a filter body was not completed, the measurement regarding a fine powder reduction performance test, a free residual chlorine removal performance test, and a soluble lead removal performance test was not implemented.

  About the trial example 10-12, the free residual chlorine removal performance test and the soluble lead removal performance test all obtained a favorable result. Further, in the fine powder reduction performance test, the fine powder reduction rate was 43.2% in trial production example 12, and high values of 60% or more were obtained in all of the fine powder reduction rates in trial production examples 10 and 11. Since the fine powder reduction rate of 50% or more is a non-defective product, the average particle diameter of the base activated carbon is considered to be preferably 160 μm or less as a condition for obtaining a good fine powder reduction performance as in Prototype Examples 2, 10 and 11. Therefore, from the conditions of the formability of the filter body and the conditions of the fine powder reduction performance, it was found that the appropriate average particle diameter of the base activated carbon is 25 to 160 μm.

[Comparison of types of powdered adsorbents]
A filter body composed of 10 parts by weight of activated carbon having an average particle diameter of 20 μm as a powdery adsorbent and having the same composition as in Comparative Example 1 except that is referred to as Comparative Example 6; A filter body to which 1.0 part by weight (0.1 parts by weight with respect to 10 parts by weight of the powdery adsorptive material shown in the table) is added based on 100 parts by weight of the powdery adsorptive material Is a prototype example 13. A filter body composed of 10 parts by weight of sodium trititanate having an average particle diameter of 3 μm as a powdery adsorbent and having the same composition as Comparative Example 1 except that is referred to as Comparative Example 7; A filter body in which 1.0 part by weight (0.1 part by weight with respect to 10 parts by weight of the powdery adsorptive material shown in the table) was added to 100 parts by weight of the powdery adsorptive material was prepared as a prototype example 14. A filter body consisting of 10 parts by weight of zeolite having an average particle diameter of 8 μm as a powdery adsorbent and having the same composition as in Comparative Example 1 except for that is designated as Comparative Example 8; A filter body in which 1.0 part by weight (0.1 part by weight with respect to 10 parts by weight of the powdery adsorbent shown in the table) was added to 100 parts by weight of the material was prepared as a prototype example 15. In addition, in following Table 7, the comparative example 1 and the trial example 2 which also used the titanium silicate of 12 micrometers of average particle diameters as a powdery adsorbent were listed, respectively.

[Results and Consideration of Comparison of Types of Powdered Adsorbent]
As shown in Tables 6 and 7, the solubility lead removal performance test was not performed in Prototype Example 13, and good results were obtained in the fine powder reduction performance test and the free residual chlorine removal performance test. The trial production example 13 can be appropriately used as a water purification filter body because generation of fine powder is reduced and the adsorption performance is also excellent. Further, in the prototype examples 2, 14 and 15, good results were obtained in any of the soluble lead removal performance test, the fine powder reduction performance test, and the free residual chlorine removal performance test. Therefore, it has been found that any of activated carbon, sodium trititanate, zeolite and titanium silicate can be suitably used as the powdery adsorbent.

[Comparison of the content of powdered adsorbent]
A filter body comprising 99.9 parts by weight of the above-mentioned activated carbon 3 as the base activated carbon, 0.1 parts by weight of titanium silicate having an average particle diameter of 12 μm as the powdery adsorbent, and 6 parts by weight of a fibrillated fiber binder A paper strengthening agent was not added, and this was taken as Comparative Example 9. In the composition of Comparative Example 9, 1.0 part by weight of a paper strengthening agent (polyamide polyamine based wet paper strengthening agent, hereinafter the same) with respect to 100 parts by weight of a powdery adsorbent (powdery adsorbent 0.1 shown in the table) A filter body to which 0.001 parts by weight was added with respect to parts by weight was set as Prototype Example 16.

  A filter body comprising 99.5 parts by weight of the above-mentioned activated carbon 3 as a base activated carbon, 0.5 parts by weight of titanium silicate having an average particle diameter of 12 μm as a powdery adsorbent, and 6 parts by weight of a fibrillated fiber binder A paper strengthening agent was not added, and this was taken as Comparative Example 10. In the composition of Comparative Example 10, 1.0 part by weight of a paper strengthening agent with respect to 100 parts by weight of the powdery adsorbent (0.005 parts by weight with respect to 0.5 parts by weight of the powdery adsorbent shown in the table) The resulting filter body is referred to as a prototype example 17.

  A filter body comprising 70 parts by weight of the above-mentioned activated carbon 3 as the base activated carbon, 30 parts by weight of titanium silicate having an average particle diameter of 12 μm as the powdery adsorbent and 6 parts by weight of a fibrillated fiber binder (paper strength agent No comparison was made with Comparative Example 11. A filter obtained by adding 1.0 part by weight of a paper strengthening agent to 100 parts by weight of the powdery adsorbent (0.3 parts by weight to 30 parts by weight of the powdery adsorbent shown in the table) in the composition of Comparative Example 11 The body was made as a trial production example 18.

  A filter body comprising 60 parts by weight of the above-mentioned activated carbon 3 as the base activated carbon, 40 parts by weight of titanium silicate having an average particle diameter of 12 μm as the powdery adsorbent and 6 parts by weight of a fibrillated fiber binder (paper strength agent No comparison was made with Comparative Example 12. A filter obtained by adding 1.0 part by weight of a paper reinforcing agent to 100 parts by weight of a powdery adsorbent (0.4 parts by weight to 40 parts by weight of a powdery adsorbent shown in the table) in the composition of Comparative Example 12 The body was made as a trial production example 19. In Table 8 below, Comparative Example 1 and Prototype Example 2 in which 90 parts by weight of the base activated carbon and 10 parts by weight of the powdery adsorbent were also listed.

[Result and Consideration of Comparison of Powdered Adsorbent Content]
As shown in Tables 8 and 9, in Comparative Example 12 and Prototype Example 19, the shape could not be maintained properly and could not be formed when producing the filter body. The formation of the filter body was good in the other comparative examples 1, 9 to 11 and trial examples 2 and 16 to 18. Comparative Example 12 and Trial Example 19 have an excess of the powdery adsorbent (40 parts by weight) as compared with the other Comparative Examples 1, 9 to 11 and Trial Examples 2 and 16 to 18, and thus the filter As conditions for obtaining sufficient formability of the body, the content of the powdery adsorbent is considered to be preferably 30 parts by weight or less. In addition, in the case of prototype example 19, since the filter body could not be formed, measurements regarding the fine powder reduction performance test, the free residual chlorine removal performance test, and the soluble lead removal performance test were not performed.

  With respect to trial production examples 2, 16 to 18, good results were obtained for the fine powder reduction performance test and the free residual chlorine removal performance test. In addition, regarding the soluble lead removal performance test, although the soluble lead removal rate was 92.8% in Prototype Example 16, the desired performance was not reached. Good results were obtained in each of the prototype examples 2, 17 and 18. Trial Example 16 has a powdery adsorbing material in a small amount (0.1 parts by weight) as compared to the other trial examples 2, 17 and 18, and therefore, it is a powdery condition as a condition for obtaining a good solubility lead removal performance. The content of the adsorbent is considered to be preferably 0.5 parts by weight or more. Therefore, from the conditions of the formability of the filter body and the conditions of the soluble lead removal performance, it was found that the appropriate content of the powdered adsorbent was 0.5 to 30 parts by weight.

  The water purification filter body of the present invention contains a powdery adsorbent to improve the adsorption performance, and the paper strength agent reduces the outflow of fine powder derived from the powdery adsorbent, so that it is high-performance water-permeable Occurrence of problems of Therefore, it is promising as an alternative to conventional water purification filter bodies.

DESCRIPTION OF SYMBOLS 10 Water purification filter body 11 Hollow cylinder member 12 Filter medium 13 Cloth-like article 14 Cap 20 Filter body manufacturing apparatus 21 Water tank 22 Mold rod member 23 Integrated hollow cylinder member and mold rod member 25 Dryer 30 Mixed slurry material 31 Base activated carbon 32 Powdery adsorbent 33 Fibrillated fiber binder 34 Paper strength agent 35 Adsorbed material 36 Component of filter medium part 37 Slurry adhered part W Water

Claims (6)

A filter body comprising a base activated carbon, a powdered adsorbent and a fibrillated fiber binder,
The average particle diameter of the base activated carbon is 25 to 160 μm,
The average particle diameter of the powdery adsorbent is 3 to 20 μm,
A water purification filter body characterized by being added with a paper strengthening agent.   The purified water filter body according to claim 1, wherein the powdered adsorbent is activated carbon.   The purified water filter body according to claim 1, wherein the powdery adsorbent is at least one selected from zeolite, titanium silicate or sodium titanate.   The water purification filter body according to any one of claims 1 to 3, wherein the paper strength agent is added in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the powdery adsorbent.   The water purification filter body according to any one of claims 1 to 4, wherein a weight ratio of the powdery adsorbent occupied in the filter body is 0.5 to 30 parts by weight.   The water purification filter body according to any one of claims 1 to 5, wherein the paper strengthening agent comprises a cationic wet paper strengthening agent.

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