KR100366781B1 - Filter cartridge using chitosan as binder and its production method - Google Patents

Abstract

The present invention relates to a filter cartridge for water purification containing chitosan and a method for producing the same.

The filter cartridge of the present invention is a laminate structure in which an inner nonwoven fabric layer, a solid component layer and an outer nonwoven fabric layer are sequentially stacked on an outer circumferential surface of a porous cylindrical core, wherein the solid layer is composed of fibrous chitosan, powdery activated carbon, and fibrous activated carbon fiber. The chitosan solution in which powdery chitosan is dissolved in acetic acid as a binder is added to the mixture to form an antimicrobial filter layer.

The filter cartridge manufacturing method of the present invention comprises the steps of preparing a chitosan solution by dissolving powdery chitosan in acetic acid, mixing the chitosan solution with activated carbon, activated carbon fiber, fibrous chitosan and distilled water to prepare a chitosan mixed solution, and Forming a filter inner nonwoven layer on the outer circumferential surface of the cartridge core and then wicking the mixed solution in the adsorption tank containing the mixed solution to adsorb solids in the solution to the outer circumferential surface of the inner nonwoven layer; It is characterized in that it comprises a step of forming the outer non-woven fabric layer on the outer peripheral surface of the solid layer adsorbed on the outer circumferential surface of the inner nonwoven fabric layer and then dried at a temperature of 100 ~ 200 ℃ after separating the metal mesh.

The filter cartridge of the present invention can increase the manufacturing productivity of the filter cartridge by using chitosan, which is an edible natural polymer instead of expensive silver, and can reduce the production cost as well as the bonding strength of the solid layer constituting the filter cartridge. By maintaining for a long time and exerting a natural antimicrobial effect, there is an advantage that can also reduce the maintenance cost required for replacement filter cartridges.

Description

Filter cartridge using chitosan as binder and its production method

The present invention relates to a filter cartridge for a water purifier containing chitosan, and more particularly, by using chitosan, which is a natural polymer, as a binder of a filter cartridge which aggregates powdered, granular activated carbon, fibrous activated carbon or activated carbon fibers. The longevity of the filter cartridge can be extended by strengthening the bonding force between activated carbon and activated carbon fiber, and by adding edible natural materials with antimicrobial properties, the production process of the filter cartridge is not only increased by eliminating the silver impregnation process but also the production cost. The present invention relates to a filter cartridge for water purification containing chitosan and a method of manufacturing the same.

In addition to the pollution problem, which has become more serious in recent years, the quality of water supplies has gradually deteriorated due to various wastewaters, and the aging of water supply pipelines and the increase of collective housing facilities such as apartments further reduce the quality of tap water supplied to each household. It is a factor.

In other words, the aging of the tap water supply pipe is a source of various metal ions and rust, such as iron and zinc, and the tap water storage tank in a group residential facility becomes a place of habitat for various microorganisms and bacteria. It became.

Therefore, in recent years, tap water supplied from each home or office is rarely used as it is, and natural water is purchased and used as drinking water, or various types of water purifiers are used as purified water after drinking water.

As a filter for removing various contaminants, various types of filter cartridges in which activated carbon, an ion exchange resin, or activated carbon and a polymer membrane filter are combined in a water purifier are used for water purifiers used for water purification of poor quality as described above.

In addition, such filter cartridges are commonly used to filter out various unnecessary or harmful metal ions and foreign substances such as impurities, odors, pigments, and bacteria by binding activated carbon having molecular adsorption to fibrous resins to improve water purification ability. Since the filter cartridge in the water purifier is always in contact with water, there is a risk of secondary growth of bacteria and bacteria in the fibers constituting the filter cartridge.

In particular, the activated carbon is excellent in removing residual chlorine for tap water, but the adsorption function is deteriorated when used for a long time, so that various contaminants adsorbed in the activated carbon are desorbed, thereby discharging water containing more organic matter than unpurified water. If it is stopped for a while, various bacteria grow in the filter cartridge of the water purifier.

Looking at a typical drinking water purification method using the above various types of water purification filters, purified water is completed by passing the feed water in the order of sedimentation tank → primary activated carbon cartridge → membrane → secondary activated carbon cartridge.

At this time, the activated carbon cartridge is usually filled with palm-based powdered activated carbon in a synthetic resin case (cartridge). Particularly, powdered activated carbon filled in the secondary activated carbon cartridge uses powdered activated carbon impregnated with silver to suppress bacterial growth. It is not large, and the deposition process is not only complicated and difficult, but also increases the price.

In addition, when the adsorption capacity of the primary activated carbon cartridge decreases, the load of the membrane increases, which is expensive and shortens the lifetime of the membrane, which is a key component, so that the adsorption capacity of the activated carbon cartridge and the ability to inhibit bacterial growth are very important. There is no other way than to apply the method or replace the cartridge frequently.

Therefore, drugs having excellent sterilizing power have been developed, such as microorganisms, molds, etc., but since such drugs are mixed with drinking water and directly absorbed by the human body, application to a water purifier filter requires sufficient verification for a long time.

Antimicrobial agents commonly used in the antimicrobial processing of fibers and filters can be divided into inorganic and organic antimicrobial agents. The antimicrobial properties of organic antimicrobial agents are excellent, but they have some problems in the safety of the substances themselves. Inorganic antimicrobial agents include metals such as silver and copper. And it can be divided into ceramic system, and in the case of ceramic system, antimicrobial activity is reduced after processing and can not be harmless when absorbed by human body. Therefore, metal antibacterial agent is mainly used when absorbed by human body.

However, in the case of copper among the above metals, the situation is somewhat controversial. That is, since there is room for controversy about the presence or absence of harmful ions of copper ions and rust that may be eluted when the tap water supply pipe is used as the copper pipe, it is common to use silver attached to activated carbon as described above.

In other words, the filter cartridge has an antimicrobial ability and is manufactured by additionally impregnating powdered activated carbon with silver which is harmless to humans. However, this also dissolves and consumes the impregnated silver with prolonged use, thereby reducing the antibacterial ability, shortening the life of the filter cartridge, and facilitating the combination of the silver with the carbon-based material. As described above, there is a problem in that productivity is lowered and production costs are increased by using expensive silver.

Therefore, many studies have been conducted on edible natural substances having antimicrobial properties that can replace expensive silver, and chitosan, a safe natural polymer substance having no harmfulness to the human body, is antibacterial if its purity is maintained as a representative substance. It is widely used as an additive.

As known data related to chitosan, Japanese Patent Application Laid-Open No. Hei 2-15904 discloses a method for producing an antimicrobial and anti nematode composition, and Japanese Patent Application Laid-open No. Hei 2-80051 describes a preparation method for an antimicrobial and deodorant polymer composition. -72501 discloses a method for producing a deodorant polymer composition based on chitosan and polyurethane, and Japanese Patent Laid-Open No. Hei 3-76801 discloses a method of transferring chitosan-containing thermoplastic resin to a fabric surface by mixing chitosan powder with a thermoplastic resin. However, there is no mention of the molecular weight of chitosan or whether the chitosan-containing resin has antimicrobial properties.

Accordingly, the filter cartridge for water purification of the present invention is to solve the above problems, a material constituting the filter cartridge by using a natural edible material having antibacterial ability as a constituent of the filter cartridge and the activated carbon fiber binding binder. It is an object of the present invention to provide a filter cartridge for a water purifier and a method of manufacturing the same, which can reduce the productivity and production cost of the filter cartridge by omitting an expensive silver deposition process as well as extending the service life by increasing the binding force between them.

1 is a schematic cross-sectional view of a solid adsorption device for producing a filter cartridge of the present invention.

Figure 2 shows the filter cartridge of the present invention,

(A) is a section,

(B) is a partial enlarged view.

Figure 3 is a graph showing the iodine adsorption power of the present invention and the comparative filter cartridge.

((Explanation of symbols for main part of drawing))

11. Filter cartridge core 13. Suction tank

14. Rotating Suction Device 15. Metal Mesh

21. Inner Nonwoven Layer 22. Solid Layer

23. Outer nonwoven layer

First, the object of the present invention is to prepare a chitosan solution in which powdery chitosan is dissolved in acetic acid, using a chitosan mixed solution mixed with activated carbon, activated carbon fibers and distilled water, and adsorbing and drying the mixed solution on the filter inner nonwoven layer. Secondly, after adding the fibrous chitosan to the mixed solution, the additional mixed solution is adsorbed and dried on the filter inner nonwoven layer. Third, the fibrous chitosan is prepared as a mixed aqueous solution of activated carbon, activated carbon fiber, and distilled water. This mixed aqueous solution is achieved by a filter cartridge produced by adsorbing and drying the inner nonwoven fabric layer for a filter and a method for producing the same.

In the filter cartridge for water purification containing chitosan of the present invention, the molecular weight of the powdery or fibrous chitosan is 100,000 to 2,000,000, and the powdery chitosan concentration of the chitosan solution prepared by dissolving the powdery chitosan in acetic acid is 0.01 to 5 wt%.

In addition, the total content of the solids contained in the chitosan mixed solution, the additional mixed solution or the mixed aqueous solution before adsorbing to the filter inner nonwoven layer, that is, the activated carbon fibers, the activated carbon, the fibrous chitosan, and the powdered chitosan is 0.1 to 10wt% of the total solution. At the same time, when the powdery and fibrous chitosan is contained together, there is a technical feature in that each 50wt% of the total content of chitosan.

The reason for limiting the molecular weight, chitosan concentration and solid content of the chitosan is as follows.

Although there are various claims about the molecular weight that exhibits the best antibacterial and bactericidal properties of chitosan, the molecular weight of chitosan is considered in consideration of the viscosity characteristics and workability of the mixed solution for adsorbing solid content to the filter cartridge of the present invention. Was limited to 100,000 to 2,000,000.

When the concentration of the powdery chitosan dissolved in acetic acid is less than 0.01wt%, when the activated carbon fiber, the powdered activated carbon, and the chitosan are adsorbed on a nonwoven fabric and dried, the role of chitosan as a binder decreases and the strength of the filter cartridge decreases. If it exceeds 5 wt%, the powdery chitosan will not be dissolved due to exceeding the dissolution limit of acetic acid, and the viscosity of the solution will rise to impair workability.

In addition, if the solid content in the mixed solution is less than 0.1wt%, the adsorption amount of the solid content is small, so that the adsorption time is long, the productivity is reduced, and if it exceeds 10wt%, the pressure of the suction pump is eventually necessary before obtaining the adsorption amount of the required thickness. The adsorption layer of the thickness cannot be obtained, and the filter cartridge produced as described above also has a lower strength.

Details of the effects and the resulting effects, including the object and technical configuration of the present invention will be clearly understood by the following description with reference to the drawings showing a preferred embodiment of the present invention.

Fig. 1 is a schematic cross sectional view of an adsorption device equipped with a cartridge core for depositing solid content of a chitosan mixed solution on the outer circumferential surface of an inner nonwoven fabric layer. Is shown. FIG. 1 omits the illustration of the inner nonwoven layer formed on the outer circumferential surface of the core to show the shape of the core.

The method for producing a filter cartridge according to the present invention comprises the steps of preparing a chitosan solution, preparing the chitosan solution as a mixed solution or an additional mixed solution, or preparing a chitosan solution directly without preparing the chitosan solution. And a flange of the rotary suction device 14 installed in the adsorption tank 13 in which the filter nonwoven fabric is wound around the outer circumferential surface of the cartridge core 11 to form the inner nonwoven fabric layer 21 and then contains the mixed solution 12 or the like. (14A) mounting at the center of the flange, and installing the metal mesh (15) on the flange outer peripheral surface of the rotary suction device equipped with a cartridge core to form a concentric circle at regular intervals apart from the outer peripheral surface of the inner nonwoven fabric layer (21) The cartridge core 11 in which the inner nonwoven fabric layer 21 is formed in the adsorption tank 13 in which the rotary suction device 14 of the cartridge core is prepared as described above is prepared. Filling the mixed solution 12 and the like so as to be completely immersed, and sucking the mixed solution and the like through the hollow portion of the core while rotating the cartridge core immersed in the mixed solution and adsorbing the solids in the solution to the outer circumferential surface of the inner nonwoven fabric layer 21. And pulling out the cartridge core on which adsorption is completed, separating the metal mesh 15, and drying the solid layer 22 deposited on the outer circumferential surface of the inner nonwoven fabric layer 21 in a range of 100 to 200 ° C., and a dried filter. The outer circumferential surface of the solid component layer of the cartridge is wrapped with a filter nonwoven fabric to form an outer nonwoven fabric layer 23.

At this time, the solid layer adsorbed on the outer circumferential surface of the inner nonwoven fabric layer is a structure in which fibrous chitosan (22A), activated carbon fiber (22B) and activated carbon (22C) are combined with powdery chitosan (22D) dissolved in acetic acid, fibrous chitosan May not be added.

When the drying temperature is less than 100 ° C, chitosan is not completely melted and thus does not serve as a binding binder for solids, and thus the strength of the filter is lowered. When the drying temperature exceeds 200 ° C, the dissolved chitosan is decomposed. You will not be able to play the role of

Three filter cartridge compositions according to the embodiment of the present invention manufactured by the above method are shown in Table 1 below.

(Unit: wt%) division Activated carbon fiber Powdered activated carbon Fibrous chitosan Powdered Chitosan Chitosan Chitosan concentration One 60 30 0 10 0.01 to 5 2 10 0 3 5 5

In the example of Table 1, the powdery chitosan is contained in the total amount of chitosan liquid, the weight ratio of the powdery chitosan is controlled by the amount of chitosan liquid and fibrous chitosan is added alone. Therefore, when the weight ratio of activated carbon fiber to activated carbon and chitosan is adjusted as shown in Table 1, distilled water is added so that the total solid content contained in the mixed solution, the additional mixed solution, or the mixed aqueous solution is 0.1 to 10 wt%.

The filter cartridges of the four comparative examples for comparison with the three examples are as shown in Table 2 below, and the preparation method is prepared by admixing an aqueous solution in which the activated carbon fibers, the activated carbon, and the binder binder are dispersed and mixed in distilled water, and then adsorbed as described above. Prepared by drying and adjusting the amount of distilled water to maintain the solid concentration in Table 2.

division Activated carbon fiber Powdered activated carbon Binding binder Solids concentration Kinds content 5 60 30 PVA 10 0.1-10 wt% 6 PAN 7 Powdered PE 8 Sodium alginate

* PVA: Polyvinylalcohol, PAN: Polyacrylonitrile,

PE: Polyethylene

The filter cartridges of the Examples and Comparative Examples were all made of the same standard, and were manufactured in the form of a hollow cylinder having an outer diameter of 60 mm, an inner diameter of 34 mm, and a length of 240 mm, and the residual concentration of iodine was 2.5 g / 3 shows the results of examining the adsorption performance of iodine per unit weight of the filter.

As shown in FIG. 3, it can be seen that the embodiment of the present invention using chitosan has an excellent iodine adsorption capacity compared with the comparative example, and particularly, when the powdery chitosan and the fibrous chitosan are included together.

In addition, when only the fibrous chitosan is mixed without using acetic acid, the binding strength of the solid component layer is slightly lower than that of acetic acid, but the binding force due to the inherent viscosity of the fibrous chitosan is exerted.

By using chitosan, an edible natural polymer instead of expensive silver, not only can it increase the manufacturing productivity of the filter cartridge and reduce the production cost, but it also maintains the binding force of the filter cartridge solid layer for a long time and exhibits natural antibacterial activity. Maintenance costs can also be reduced.

Claims (12)

A filter cartridge in which an inner nonwoven layer, a solid layer, and an outer nonwoven layer are sequentially stacked on an outer circumferential surface of a porous cylindrical core, wherein the solid layer includes at least one of activated carbon and activated carbon fibers among fibrous chitosan, powdered activated carbon, and fibrous activated carbon fibers. A filter cartridge for water purification containing chitosan, characterized in that two or more substances are bonded by a chitosan solution in which powdery chitosan is dissolved in acetic acid as a binder. The filter cartridge for water purification according to claim 1, wherein the molecular weight of chitosan is 100,000 to 2,000,000. The chitosan solution according to claim 1, wherein the chitosan solution is chitosan dissolved in acetic acid so that the chitosan concentration is 0.01 to 5 wt%. 2. The filter cartridge for water purification according to claim 1, wherein the content of fibrous chitosan and powdery chitosan contained in the solid content layer is the same amount, and the total amount thereof is 0.01 to 50 wt% of the total amount of solid content. The filter cartridge for water containing chitosan according to claim 1, wherein only powdery chitosan is present in the solid layer without fibrous chitosan, wherein the content of powdery chitosan is 0.01 to 50 wt% of the total amount of solids. In preparing a filter cartridge for a water purifier, preparing a chitosan solution by dissolving powdery chitosan in acetic acid, the chitosan solution comprising at least 3 including activated carbon, activated carbon fibers and distilled water in activated carbon, activated carbon fibers and fibrous chitosan and distilled water. Mixing with at least two kinds of materials to prepare a chitosan mixed solution, forming a filter inner nonwoven layer on the outer circumferential surface of the cartridge core, and then sucking it in an adsorption tank containing the mixed solution to absorb solids in the mixed solution of the inner nonwoven layer. Adsorbing on the outer circumferential surface, extracting a cartridge core having a solid layer formed by solids adsorption, separating and drying the metal mesh, and forming an outer nonwoven fabric layer on the outer circumferential surface of the solid layer adsorbed on the inner nonwoven layer outer circumferential surface Chitosan characterized by A process for producing a water purification filter cartridge contains. 7. A method for producing a filter cartridge for water purification containing chitosan according to claim 6, wherein the chitosan solution is dissolved in acetic acid so that the concentration of chitosan is 0.01 to 5 wt%. 7. A method for producing a water purification filter cartridge containing chitosan according to claim 6, wherein the molecular weight of chitosan is 100,000 to 2,000,000. 7. The method of manufacturing a filter cartridge for water purification containing chitosan according to claim 6, wherein the solid content concentration of the chitosan mixed solution is 0.1 to 10 wt%. 7. The chitosan according to claim 6, wherein the content of powdery chitosan and fibrous chitosan is the same amount when the solid content of the chitosan mixed solution is 100wt%, and the total amount thereof is 0.01-50wt% of the total solid content. Method for producing a water filter cartridge containing a. 7. The chitosan according to claim 6, wherein the content of the powdered chitosan is 0.01 to 50wt% of the total solid content when the solid content in the chitosan mixed solution is 100wt% and only the powdery chitosan is present in the solid content without fibrous chitosan. Method for producing a water filter cartridge containing a. The method for producing a water purification filter cartridge containing chitosan according to claim 6, wherein the temperature for drying the solid layer is 100 to 200 占 폚.