KR102353712B1 - positive electric charge-filter containing multi-laminating - Google Patents

Abstract

A positive charge filter is provided. The positive charge filter according to an embodiment of the present invention includes first to third nonwoven fabrics containing at least one selected from polypropylene fibers, polyethylene fibers, and polyethylene terephthalate fibers, wherein the first nonwoven fabric includes the second It is interposed between the nonwoven fabric and the third nonwoven fabric, and satisfies all of Equations 1 to 4 below, and a positive charge coating layer is formed on the fiber strands included inside and outside the first to third nonwoven fabrics. According to this, while maintaining a high water permeability, it is possible to efficiently remove contaminants including pathogenic microorganisms present in water without additional processes or facilities, implement an eco-friendly positive charge filter, and furthermore, the removal rate by showing a uniform removal rate with respect to the permeate flow rate By providing a positive charge filter that is easier to predict and highly reliable, its utility in various fields can be greatly improved.

Description

Positive electric charge-filter containing multi-laminating structure

The present invention relates to a positive charge filter having a multilayer structure, and more particularly, to a positive charge filter having a multilayer structure in which a porous positive charge nonwoven fabric is laminated in a multilayer structure to improve the removal efficiency of contaminants such as pathogenic microorganisms present in water. .

In general, numerous ionic substances and chemicals, including Natural Organic Matter (NOM), exist in water, and they are not removed in the water treatment process and act as causative substances that generate new pollutants.

In addition, recently, the existence of pathogenic microorganisms that cannot be removed by chlorine disinfection is controversial. For example, pathogenic microorganisms classified into viruses, Cryptosporidium, Giardia, etc. are discharged into the environment through human and animal feces and are present in not only sewage but also surface water and groundwater. In the case of pathogenic microorganisms including these viruses, since they are very small in size, they are hardly treated by general filtration, and they can live stably in water for several months or more by forming a cyst with strong resistance.

In addition, for drinking water, standards and regulations for heavy metals such as aluminum, iron, lead, and mercury have been announced and utilized by the Ministry of Environment, and continuous analysis and management is in progress to respond to various external environmental changes.

Meanwhile, as described above, high coagulation treatment, activated carbon adsorption, and membrane filtration have been proposed in the water treatment process to remove trace contaminants remaining in water. . In particular, membrane filtration has recently been studied for practical use in the advanced water purification process, but it has not yet been widely used due to economical cost and technical problems.

For example, Japanese Patent Laid-Open No. 1994-015167 discloses a positive charge filter media technology manufactured through a post-treatment coating method using a polypropylene media. However, in the above technique, the material stability is rather high in that polypropylene is used instead of glass fiber, but only viruses can be removed, but there is a problem in that the flow rate and filtration pressure are significantly lowered without removing bacteria and bacteria.

In addition, Korean Patent Publication No. 10-2004-0088046, U.S. Patent No. 7,601,262, Korean Patent Publication No. 10-2002-0029669, etc., use glass fiber as a basic filter material for manufacturing antiviral media, A positive charge filter is manufactured by adding a prominent inorganic compound, and a technology for adsorbing and removing viruses using it is introduced. There was a problem that it could not be diversified in the product group by the compound added during manufacturing using glass fiber and glass fiber.

Accordingly, the present inventors are environmentally friendly by laminating nonwoven fabrics having different physical properties in a multi-layer structure without additional facilities or equipment, and improve the removal efficiency for contaminants such as pathogenic microorganisms and at the same time exhibit a uniform removal rate with respect to the permeate flow rate. We have completed the invention of a filter that has improved usability in various water treatment fields, including water purification filters that have improved predictability.

Patent Publication No. 2012-0073908

The present invention was devised in view of the above, and while maintaining a high water permeability, efficiently removes contaminants including pathogenic microorganisms present in water without additional processes or facilities, and provides an environmentally friendly positive charge filter. has a purpose

Another object of the present invention is to provide a positive charge filter with high reliability and easier prediction of the removal rate by exhibiting a uniform removal rate with respect to the permeate flow rate.

In order to solve the above problems, the present invention includes first to third non-woven fabrics containing at least one selected from polypropylene fibers, polyethylene fibers, and polyethylene terephthalate fibers, wherein the first non-woven fabric is the second non-woven fabric. and a multi-layered positive charge filter interposed between the third nonwoven fabric, satisfying all of the following Equations 1 to 3, and having a positive charge coating layer formed on the fiber strands included inside and outside the first to third nonwoven fabrics. to provide.

According to an embodiment of the present invention, the average fineness of the first nonwoven fabric, the second nonwoven fabric, and the third nonwoven fabric may be 1:1 to 2.5:1 to 2.5.

In addition, in the positive charge filter, when the permeate flow rate is reduced by 50% under the permeate flow rate condition of 0.1 to 8LPM, the removal rate can be improved by 4% or more.

In addition, the first nonwoven fabric may have an average fineness of 0.1 to 10 μm, an average pore diameter of 0.5 to 20 μm, an average thickness of 0.4 to 1.5 mm, and a basis weight of ^{50 to 200 g/m 2 .}

In addition, the second nonwoven fabric may have an average fineness of 0.1 to 25 μm, an average pore diameter of 51 to 100 μm, an average thickness of 0.1 to 0.5 mm, and a basis weight of ^{15 to 70 g/m 2 .}

In addition, the third nonwoven fabric may have an average fineness of 0.1 to 25 μm, an average pore diameter of 51 to 100 μm, an average thickness of 0.1 to 0.5 mm, and a basis weight of ^{30 to 100 g/m 2 .}

In addition, the first to third nonwoven fabrics may be subjected to needle punching or embossing.

In addition, the positive charge filter may be characterized in that the surface charge is 5 ~ 50 mV.

In addition, the present invention provides an adsorption filter for water treatment comprising the above-described positive charge filter.

According to an embodiment of the present invention, the first to third nonwoven fabrics included in the positive charge filter may be manufactured in a bent form or a rolling form.

According to the present invention, by stacking and using nonwoven fabrics having different physical properties without additional processes or equipment, the removal rate of contaminants including pathogenic microorganisms present in water is improved, and there is little loss in permeate flow rate, so the filter for water treatment It can greatly improve the usability in various fields where it is used.

In addition, since the positive charge filter according to the present invention includes a positive charge coating layer, the removal rate of negatively charged viruses and organic/inorganic particles can be improved, and an eco-friendly filter for water treatment can be implemented.

In addition, by having a uniform removal rate with respect to the permeate flow rate, it is possible to easily predict the removal performance and improve the reliability of the positive charge filter.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In general, microfiber filters widely used for water treatment have a disadvantage in that the filtration efficiency is low because the filtration area is small and there is no electrostatic force, and the membrane filter has a disadvantage in that the filtration efficiency is high but the pressure loss is large. Therefore, research is being conducted to increase the filtration efficiency of the fiber filter and reduce the pressure loss by applying an electrostatic force to the fiber filter having micro-sized pores to compensate for the shortcomings of the microfiber filter and the membrane filter.

However, as described above, when micro-sized glass fibers or nano-sized fibers are applied to a filter for water treatment, it is uneconomical because the filtration efficiency for microorganisms such as viruses or heavy metals carrying electric charges is low compared to the complicated manufacturing process, The stability and durability of the fiber is relatively weak, and in particular, in the case of glass fiber, there is a problem with the use of limitation because there is a controversy over the harmfulness such as carcinogenesis.

Accordingly, the present invention includes first to third nonwoven fabrics laminated containing at least one selected from polypropylene fibers, polyethylene fibers and polyethylene terephthalate fibers, wherein the first nonwoven fabric includes the second nonwoven fabric and the third nonwoven fabric By implementing a positive charge filter of a multilayer structure in which a positive charge coating layer is formed on the fiber strands interposed therebetween and included inside and outside the first to third nonwoven fabrics, pathogenic microorganisms present in water without a complicated manufacturing process or additional equipment However, it can exhibit excellent adsorption and removal performance for some heavy metals, etc., and through this, the utilization of the water treatment field was improved and the solution of the above-mentioned harmful problem was sought.

Furthermore, the present invention improves the predictability of the removal rate by ensuring the uniformity of the change in the removal rate according to the permeate flow rate by differentiating the physical properties of the first to third nonwoven fabrics to be laminated.

That is, the present invention implements the first to third nonwovens to satisfy all of the following Equations 1 to 4, so that whenever the permeate flow rate decreases by 50% under the permeate flow rate condition of 0.1 to 8 LPM, the removal performance is reduced by 4% It is possible to implement an improved positive charge filter, and through this, it is possible to predict in advance the removal rate of contaminants included in water such as viruses, heavy metals, pathogenic microorganisms and other organic/inorganic particles, so that it can be used in fields where positive charge filters are used. can be greatly improved.

In relation to Equation 1, if the value of Equation 1 is less than 0.066, the thickness of the first nonwoven fabric is excessively thick, and thus the removal rate according to the physical properties of the first nonwoven fabric is represented, thereby representing the first to third nonwoven fabrics having different physical properties. It may be difficult to achieve the goal of improving the removal rate through the relationship with the nonwoven fabric, and it may be difficult to implement a uniform removal rate according to the flow rate because the first nonwoven fabric depends only on the physical properties. In addition, if the value of Equation 1 exceeds 1.25, a durability problem may occur due to a decrease in the thickness of the first nonwoven fabric, and a uniform removal rate according to flow rate due to a decrease in the distance between the second nonwoven fabric and the third nonwoven fabric It may be difficult to implement, and there is a problem that the improvement in the removal rate due to the difference in fineness and average pore diameter, which will be described later, is insignificant, and thus cannot be achieved as much as desired.

Next, with respect to Equation 2, if the value of Equation 2 is less than 0.075, the positive charge filter according to the present invention may be applied due to the excessive basis weight of the first nonwoven fabric and reduced water permeability. Also, if the value of Equation 1 exceeds 1.4, the durability of the first nonwoven fabric interposed between the second nonwoven fabric and the third nonwoven fabric may be reduced, and thus the stability and process reliability of the positive charge filter may be lowered, resulting in flow rate It may be difficult to implement a uniform removal rate according to the requirements, and the improvement in the removal rate due to the difference in fineness and average pore diameter, which will be described later, is insignificant, so there is a problem that it cannot be achieved as desired.

Next, with respect to Equation 3, if the value of Equation 3 is less than 0.15, the basis weight of the first nonwoven fabric is excessive and the water permeability is lowered. , Also, if the value of Equation 1 exceeds 2.33, the durability of the first nonwoven fabric interposed between the second nonwoven fabric and the third nonwoven fabric is lowered, and thus the stability and process reliability of the positive charge filter may be lowered, resulting in a decrease in the flow rate. Accordingly, it may be difficult to implement a uniform removal rate, and the improvement in the removal rate due to the difference in fineness and average pore diameter, which will be described later, is insignificant, so that the desired level cannot be achieved.

Next, in relation to Equation 4, if the value of Equation 4 is less than 2.55, the average pore diameter of the first nonwoven fabric is large, and thus the removal rate according to the increase in the flow rate may be reduced, and as the value of Equation 4 approaches 1, the Since the difference in the pore diameter of the first to third non-woven fabrics is reduced, there may be a problem in that the change in the removal rate cannot be uniformly guaranteed. In addition, if the value of Equation 4 exceeds 200, the average pore diameter of the first nonwoven fabric may be too small, and thus the differential pressure may increase, thereby making it difficult to implement a uniform removal rate according to the flow rate.

On the other hand, since the average pore diameter may be affected by the fineness, the ratio of the average fineness of the first nonwoven fabric, the second nonwoven fabric and the third nonwoven fabric is 1: 1 to 2.5: 1 to 2.5 in order to realize a uniform removal rate according to the flow rate. can indicate If the average fineness of the first non-woven fabric, the second non-woven fabric, and the third non-woven fabric has a value less than the lower limit of the numerical range, it may be difficult to control the average pore diameter in relation to Equation 4, and if the first non-woven fabric, the second non-woven fabric When the average fineness of the nonwoven fabric and the third nonwoven fabric exceeds the upper limit of the numerical range, a problem of lowering removal rates according to the fineness of the second nonwoven fabric and the third nonwoven fabric may occur.

Hereinafter, the first to third nonwoven fabrics and the positive charge coating layer included in the positive charge filter according to the present invention will be described.

The first to third nonwovens are applicable to conventionally used, preferably thermal bonding nonwovens, air ray nonwovens, wet ray nonwovens, and needle punching nonwovens. ), spanless (water flow bonding method-Water zet), spun bond, melt blown, stitch bond, and electro spinning nonwoven fabric It may be, preferably, a melt blown (Melt Blown) nonwoven fabric.

In addition, as fibers constituting the first to third nonwoven fabrics, polypropylene fibers, polyethylene terephthalate fibers, polyethylene fibers, polyester fibers, nylon fibers, and cellulose fibers may include at least one selected from the group consisting of, preferably polypropylene fibers. , may include one or more selected from polyethylene terephthalate fibers, polyethylene fibers, and polyester fibers. More preferably, it may include at least one selected from polypropylene fibers, polyethylene, and polyethylene terephthalate fibers.

In this case, the first to third nonwoven fabrics may have an average thickness of 0.4 to 1.5 mm, 0.1 to 0.5 mm, and 0.1 to 0.5 mm, respectively. If the average thickness of each of the first to third nonwoven fabrics is less than the numerical range, there may be a problem in that a sufficient thickness for depth filtration is not formed, so that the adsorption performance due to the fast flow rate of the permeate is reduced, and if the first When the average thickness of each of the nonwoven fabric to the third nonwoven fabric exceeds the above numerical range, there may be problems in terms of durability and stability, such as poor workability of the nonwoven fabric and a decrease in service life due to differential pressure generation.

In addition, the first to third nonwoven fabrics may have a basis weight of ^{50 to 200 g/m 2} , 15 to 70 g/m ^{2 ,} and 30 to 100 g/m ^{2 , respectively.} If the basis weight of each of the first nonwoven fabrics to the third nonwoven fabrics is less than the above numerical range, the breaking strength of the nonwoven fabric is lowered and there may be a process issue such as a problem of breaking during coating and processing, and if the first nonwoven fabric When the basis weight of each of the to third nonwoven fabrics exceeds the above numerical range, there may be problems in that the fiber density in the volume of the nonwoven fabric is increased, thereby generating a differential pressure due to the dense structure and rapidly reducing the service life.

In addition, the first to third nonwoven fabrics may have an average fineness of 0.1 to 10 μm, 0.1 to 25 μm, and 0.1 to 25 μm, respectively. If the average fineness of each of the first to third nonwovens is less than the above numerical range, there may be a problem in that the flow rate decreases due to the generation of differential pressure during filtration. If it exceeds the range, there may be a problem that the porosity decreases and the filtration efficiency decreases.

In addition, the first non-woven fabric to the third non-woven fabric 0.5 ~ 20 μm, 51 ~ 100 μm, respectively and 51 to 100 μm average pore diameter. If the average pore diameter of each of the first nonwoven fabrics to the third nonwoven fabric is less than the numerical range, the flow rate according to the increase in differential pressure may decrease, and as the flow rate decreases, a uniform removal rate according to the flow rate may not be implemented. In addition, if the average pore diameter of each of the first to third nonwovens exceeds the above numerical range, it may be difficult to uniformly coat the positively charged coating layer, which will be described later, so that there may be a problem in that filtration efficiency is reduced. Also, if the first to third nonwoven fabrics have the same pore size, there may be a problem in that the removal rate cannot be uniformly guaranteed.

In this case, the first to third nonwoven fabrics may be subjected to needle punching or embossing. In this case, it is possible to secure a uniform flow path and channel in the positive charge filter, which makes it easier to predict the removal rate, and furthermore, production efficiency and processability can be improved in the process of coating the positive charge coating layer, which will be described later.

On the other hand, the positive charge coating layer coated on the fiber strands included in the interior and surface of the first to third nonwoven fabrics is not formed to be spaced apart from the surface of the fiber strands in an island shape, but to be coated to completely surround the surface of the fiber strands. can

In this case, the positively charged coating layer may have an average thickness of 0.01 to 3 μm, and preferably, an average thickness of 0.05 to 1 μm. If the average thickness of the positively charged coating layer is 0.05 μm, there may be a problem of physical property deviation due to a decrease in the uniformity of the positively charged coating layer. There may be problems in terms of durability and stability due to a problem of dissolution.

In addition, at this time, the positively charged coating layer may be coated on the surface of the fiber strands included in the inside and the surface of the nonwoven fabric with a unit area of 50% or more, and more preferably on the surface of the fiber strands with a unit area of 75% or more. have. When the positively charged coating layer is coated on the surface of the fiber strand with a unit area of less than 50%, there is a problem of deterioration of physical properties in which the virus adsorption performance becomes non-uniform due to the decrease in the uniformity of the positively charged coating.

The positive charge coating layer may be coated with a positive charge coating resin including a solvent, a crosslinking agent, and a polyfunctional amine compound.

The crosslinking agent of the positively charged coating resin not only serves as a crosslinking agent and a binder between the polyfunctional amine compounds, but also serves to improve adhesion between the nonwoven fabric and the coating component. Bisphenol A epoxy resin, bisphenol F epoxy resin, hydrogenated Bisphenol A epoxy resin, hydrogenated bisphenol F epoxy resin, flame retardant epoxy (brominated epoxy) resin, and novolak-type epoxy resin can be used or a mixture of two or more selected from, preferably bisphenol A epoxy resin, bisphenol One or two or more selected from F epoxy resin, hydrogenated bisphenol A epoxy resin, hydrogenated bisphenol F epoxy resin, and novolak-type epoxy resin may be used.

The amount of the crosslinking agent used may be 0.1 to 6% by weight of the total weight of the positively charged coating resin, preferably 0.3 to 4% by weight, more preferably 0.5 to 2.5% by weight. At this time, if the content of the crosslinking agent is less than 0.1% by weight, the polyfunctional amine compound may easily come off from the nonwoven fabric, and there may be a problem that virus adsorption is not smooth due to the small amount of the amine compound, and use in excess of 6% by weight If the viscosity of the positively charged coating agent is too high, the inside of the nonwoven fabric, that is, the fibers of the nonwoven fabric, cannot be sufficiently coated, so there may be a problem of a decrease in water permeability due to a decrease in the size of the filter media pore size.

The polyfunctional amine compound serves to impart an electrostatic property showing a positive charge to the inside and outside of the nonwoven fabric, and one or two selected from polyethyleneimine, diethylenetriamine, piperazine, dimethylenepiperazine and diphenylamine More than one type may be mixed and used, and preferably, one type or two or more types selected from diethylenetriamine and diphenylamine may be mixed and used. And, the content of the polyfunctional amine compound may be 0.1 to 3% by weight of the total weight of the positively charged coating resin, preferably 0.2 to 2% by weight, more preferably 0.3 to 1.5% by weight. At this time, if the amount of the polyfunctional amine compound used is less than 0.1% by weight, there may be a problem in that the virus removal ability of the positive charge filter of the present invention is lowered, and if it is used in excess of 3% by weight, the viscosity of the positive charge coating agent becomes too high, so that the inside of the nonwoven fabric, that is, There may be a problem that the fibers of the nonwoven fabric cannot be sufficiently coated, and there may be a problem that unreacted substances are eluted.

As the solvent, any known solvent may be used without limitation in the range that does not affect the properties of the positive charge coating resin and the positive charge coating layer formed therethrough and the removal rate or flow rate of the positive charge filter, and non-limiting examples thereof include distilled water and diethylene glycol It can be implemented to include ethyl ester.

In addition, due to the positive charge coating layer formed through the above-described positive charge coating composition, the positive charge filter according to the present invention may have a surface charge of 5 to 50 mV under the condition of pH 7, preferably 15 to 50 mV It may have a surface charge. As such, the surface charge of the nonwoven fabric exhibits a positive charge, thereby imparting the ability to adsorb and collect negatively charged organic matter or particles. Also, if the surface charge of the nonwoven fabric exceeds 50 mV, the virus adsorption capacity may be maintained at a certain level or more, but the production cost increases due to an increase in reaction time and concentration to exhibit a high surface charge during the manufacturing process This may be disadvantageous from an economic point of view.

Next, the present invention provides an adsorption filter for water treatment comprising a positive charge filter having the first to third nonwoven fabrics coated with the positive charge coating layer described above.

The shape and size of the adsorption filter for water treatment can be variously applied depending on the target and industry group for which the filter is used, and as a non-limiting example thereof, the first to third nonwoven fabrics included in the adsorption filter for water treatment are bent. Or it may be manufactured in a rolling form.

Through this, the adsorption filter for water treatment according to the present invention can exhibit a MS2-Phage removal rate of 99.99% or more while an effective purified water amount is 200L or more under the condition of a flow rate of 10 LPM or less, and a K. Terrigena removal rate of 99.9999% or more. .

Hereinafter, the present invention will be described in more detail through the following examples. The following examples are presented only to illustrate the present invention, and the scope of the present invention is not limited by the following examples.

[ production example ]

production example 1. Manufacture of positive charge filter.

A positively charged coating composition solution was prepared by mixing 95.95 parts by weight of distilled water, 0.05 parts by weight of sodium dioctyl sulfosuccinate, 3 parts by weight of polyethylene imine having a weight average molecular weight of 70,000 and 1 part by weight of polyethylene glycol diglycidyl ether.

Next, the polypropylene melt blown first nonwoven fabric having an average fineness of 5 μm, an average pore diameter of 5 μm, an average thickness of 1 mm and ^{a basis weight of 100 g/m 2 , an average fineness of 5 μm, an average pore diameter of 5 μm,} 1 mm of the mean thickness and 100 g / m polyester having a basis weight of the ^second polypropylene meltblown second non-woven fabric, and 5 μm average fineness, an average pore diameter, average basis weight of thickness and 100 g / m ² of 1 mm of the 5 μm in After preparing the polypropylene melt blown third nonwoven fabric, the second nonwoven fabric, the first nonwoven fabric, and the third nonwoven fabric were laminated in this order.

Then, the laminated nonwoven fabric was immersed in the positive charge coating composition solution at 25° C. for 10 seconds, and then it was taken out and thermally cross-linked at 110° C. for 5 minutes to prepare a positive charge filter.

Thereafter, the positively charged filter was washed by immersion in a 1 wt% isopropyl alcohol aqueous solution at a temperature of 30 °C for 5 minutes, and dried at a temperature of 90 °C for 3 minutes.

production example 2 to 5.

A positive charge filter was manufactured in the same manner as in Preparation Example 1 except that the physical properties of the first to third nonwoven fabrics were different as shown in Table 1 below.

compare production example 1 to 4.

A positive charge filter was manufactured in the same manner as in Preparation Example 1 except that the physical properties of the first to third nonwoven fabrics were different as shown in Table 2 below.

division Properties Preparation Example 1 Preparation 2 Preparation 3 Preparation 4 Preparation 5 1st non-woven fabric Fineness (μm) 5 5 0.5 8 8 pore diameter (μm) 5 5 One 15 15 Thickness (mm) One 0.5 0.8 1.2 1.2 basis weight (g/m ² ) 100 100 60 150 60 2nd non-woven fabric Fineness (μm) 8 8 0.5 20 20 pore diameter (μm) 70 70 55 90 90 Thickness (mm) 0.3 0.4 0.2 0.4 0.4 basis weight (g/m ² ) 40 40 20 60 60 3rd non-woven fabric Fineness (μm) 8 8 0.5 20 20 pore diameter (μm) 70 70 55 90 90 Thickness (mm) 0.3 0.4 0.2 0.4 0.4 basis weight (g/m ² ) 50 50 35 90 90

division Properties Comparative Preparation Example 1 Comparative Preparation Example 2 Comparative Preparation Example 3 Comparative Preparation Example 4 1st non-woven fabric Fineness (μm) 5 5 0.5 8 pore diameter (μm) 5 5 One 15 Thickness (mm) One 0.5 0.8 1.2 basis weight (g/m ² ) 100 100 60 50 2nd non-woven fabric Fineness (μm) 15 8 0.5 20 pore diameter (μm) 70 10 55 90 Thickness (mm) 0.3 0.4 1.5 0.4 basis weight (g/m ² ) 40 40 20 150 3rd non-woven fabric Fineness (μm) 15 8 0.5 20 pore diameter (μm) 70 10 55 90 Thickness (mm) 0.3 0.4 1.5 0.4 basis weight (g/m ² ) 50 50 35 150

[Experimental Example 1] - Evaluation of whether the fineness ratio and Equations 1 to 4 are satisfied.

Results of evaluating whether the first to third nonwoven fabrics included in the positive charge filters prepared in Examples 1 to 5 and Comparative Preparation Examples 1 to 4 satisfy the fineness ratio according to the present invention and the values of Equations 1 to 4 is shown in Table 3 below.

division small dobby Equation 1 Equation 2 Equation 3 Equation 4 Preparation Example 1 satisfied 0.30 0.40 0.50 14.00 Preparation 2 satisfied 0.80 0.40 0.50 14.00 Preparation 3 satisfied 0.25 0.33 0.58 55.00 Preparation 4 satisfied 0.33 0.40 0.60 6.00 Preparation 5 satisfied 0.33 1.00 1.50 6.00 Comparative Preparation Example 1 dissatisfaction 0.30 0.40 0.50 14.00 Comparative Preparation Example 2 satisfied 0.80 0.40 0.50 2.00 Comparative Preparation Example 3 satisfied 1.88 0.33 0.58 55.00 Comparative Preparation Example 4 satisfied 0.33 3.00 3.00 6.00 *Fineness ratio: 1: 1 ~ 2.5: Based on 1 ~ 2.5

Referring to Tables 1 to 3, in the case of Preparation Examples 1 to 5, the average thickness, basis weight, and average pore diameter of the first to third nonwoven fabrics of the positive charge filter are all obtained by using Equations 1 to 4 according to the present invention. It can be seen that the ratio of fineness of the first to third nonwovens satisfies the numerical range according to the present invention.

However, it can be seen that Comparative Preparation Examples 1 to 4 do not satisfy any one of Equations 1 to 4 or do not satisfy the fineness ratio.

[ Example ] Preparation of adsorption filter for water treatment

Example One.

For the manufacture of an adsorption filter for water treatment including the positive charge filter prepared in Preparation Example 1, it is rolled and inserted into a polypropylene core having an outer diameter of 19 mm, and cut to have an outer diameter of 48 mm and a length of 116 mm. An adsorption filter for water treatment was prepared by performing end capping.

Example 1 to 4.

It was prepared in the same manner as in Example 1, except that the positive charge filter was changed as shown in Table 4 below to prepare an adsorption filter for water treatment.

comparative example 1 to 4.

It was prepared in the same manner as in Example 1, except that the positive charge filter was changed as shown in Table 4 below to prepare an adsorption filter for water treatment.

Adsorption filter for water treatment positive charge filter Example 1 Preparation Example 1 Example 2 Preparation 2 Example 3 Preparation 4 Example 4 Preparation 5 Comparative Example 1 Comparative Preparation Example 1 Comparative Example 2 Comparative Preparation Example 2 Comparative Example 3 Comparative Preparation Example 3 Comparative Example 4 Comparative Preparation Example 4

[ Experimental example 2]

1. Instantaneous flow rate evaluation

In order to evaluate the instantaneous flow rate of the adsorption filter for water treatment prepared in Examples 1 to 4 and Comparative Examples 1 to 4, the flow rate evaluation equipment (Toray Chemical) was used in our company under the condition of an inlet pressure of 1 bar using RO purified water. The results are shown in Table 5 below.

2. effective water quantity evaluation

In order to evaluate the effective purified water amount of the adsorption filter for water treatment prepared in Examples 1 to 4 and Comparative Examples 1 to 4, flow rate evaluation equipment (Toray Chemical) was used under ISO A1 DUST 1NTU (20% reduction point compared to the initial flow rate) condition. was evaluated and the results are shown in Table 5 below.

3. Evaluation of removal performance

In order to evaluate the removal performance of the adsorption filter for water treatment prepared in Examples 1 to 4 and Comparative Examples 1 to 4, it was evaluated using a flow rate evaluation device (Toray Chemical) after the initial 100L water flow under NSF P-231 protocol conditions, and the The results are shown in Table 5 below.

4. Evaluation of turbidity removal rate according to flow rate

In order to evaluate the uniform removal rate change according to the flow rate of the adsorption filter for water treatment prepared in Examples 1 to 4 and Comparative Examples 1 to 4, it was evaluated using ISO A1 DUST 20NTU flow rate evaluation equipment (Toray Chemical) and the results were evaluated. It is shown in Table 6 below.

division permeability Removal performance (%) Instantaneous flow rate (LPM) Effective water quantity (L) Turbidity Removal Rate MS2-Phage Removal Rate K. Terrigena Removal Rate Example 1 3.7 270 >99.95 >99.99 >99.9999 Example 2 4.7 230 >99.95 >99.99 >99.9999 Example 3 5.4 350 99.5 >99.99 >99.9999 Example 4 6.0 430 99.5 >99.99 >99.9999 Comparative Example 1 3.5 180 >99.95 >99.99 >99.9999 Comparative Example 2 2.7 190 >99.95 >99.99 >99.9999 Comparative Example 3 2.1 90 >99.95 >99.99 >99.9999 Comparative Example 4 3.7 340 99.5 95% 98%

Next, referring to Table 5, in the case of Examples 1 to 4 each prepared to have positive charge filters according to Preparation Examples 1, 2, 4 and 5 satisfying all of Equations 1 to 4 and the fineness ratio according to the present invention Turbidity removal rate, MS2-Phage compared to Comparative Examples 1 to 4 having a positive charge filter according to Comparative Preparation Examples 1 to 4 that do not satisfy Equations 1 to 4 or the fineness ratio according to the present invention It can be seen that both the removal rate and the K. Terrigena removal rate are excellent.

Specifically, Comparative Example 1 that does not satisfy the fineness ratio of the first to third nonwoven fabrics according to the present invention, Comparative Example 2 that does not satisfy the average pore diameter (Equation 4), and the average thickness (Equation 1) do not satisfy Comparative Example 3 exhibits a level similar to that of Example in terms of the removal rate, but it can be predicted that the instantaneous flow rate and the effective purified water amount are low, so that when the same flow rate is assumed, the removal rate value is significantly lower.

In addition, in the case of Comparative Example 4, which does not satisfy the basis weight of the first to third nonwoven fabrics according to the present invention, it can be seen that the removal rate is significantly low even at low instantaneous flow rate and effective water purification value.

Example 1 Flow (LPM) 8 4.5 3 Turbidity Removal Rate (%) 95.9 99.9 >99.95 Example 2 Flow (LPM) 8 4.5 4 Turbidity Removal Rate (%) 95.0 >99.95 >99.95 Example 3 Flow (LPM) 8 4.5 4 Turbidity Removal Rate (%) 95.3 99.5 >99.95 Example 4 Flow (LPM) 8 4.5 4 Turbidity Removal Rate (%) 95.8 >99.95 >99.95 Comparative Example 1 Flow (LPM) 8 4.5 4 Turbidity Removal Rate (%) 96 >99.95 >99.95 Comparative Example 2 Flow (LPM) 8 4.5 4 Turbidity Removal Rate (%) 98 >99.95 >99.95 Comparative Example 3 Flow (LPM) 8 4.5 4 Turbidity Removal Rate (%) >99.95 >99.95 >99.95 Comparative Example 4 Flow (LPM) 8 4.5 4 Turbidity Removal Rate (%) 89 96 99.5

Next, referring to Table 6, Examples 1 to 4 each prepared to include the positive charge filters according to Preparation Examples 1, 2, 4 and 5, which satisfy all of Equations 1 to 4 and the fineness ratio according to the present invention In the case of , it can be seen that the turbidity removal performance is improved by more than 4% when the permeate flow rate is reduced by 50% under the permeation flow rate condition of 0.1 to 8.0LPM.

However, in the case of Comparative Examples 1 to 4 having a positive charge filter according to Comparative Preparation Examples 1 to 4 that do not satisfy Equations 1 to 4 or the fineness ratio according to the present invention, not only the turbidity removal performance is low, but the present invention aims It can be seen that there is no uniform improvement in the removal rate according to the flow rate.

As a result, only a positive charge filter including a multilayer nonwoven fabric prepared to satisfy both Equations 1 to 4 and the fineness ratio according to the present invention and an adsorption filter for water treatment including the same while maintaining a high water permeability and additional processes or facilities It can be confirmed that contaminants including pathogenic microorganisms present in water can be efficiently removed without the need for a uniform removal rate with respect to the permeate flow rate.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which the present invention pertains that various substitutions, modifications, and changes are possible without departing from the technical matters of the present invention. It will be clear to those who have the knowledge of Therefore, the scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

Claims (10)

1st to 3rd nonwoven fabrics containing at least one selected from polypropylene fibers, polyethylene fibers, and polyethylene terephthalate fibers;
The first nonwoven fabric is interposed between the second nonwoven fabric and the third nonwoven fabric,
All of the following Equations 1 to 4 are satisfied,
A positive charge filter having a multi-layer structure in which a positive charge coating layer is formed on the fiber strands included inside and outside the first to third nonwoven fabrics.

According to claim 1,
The positive charge filter is a positive charge filter in which the removal performance is improved by 4% or more when the permeate flow rate is reduced by 50% under the permeate flow rate condition of 0.1 to 8.0LPM. According to claim 1,
The average fineness of the first non-woven fabric, the second non-woven fabric, and the third non-woven fabric is 1: 1 to 2.5: positive charge filter, characterized in that 1 to 2.5. According to claim 1,
The first nonwoven fabric has an average fineness of 0.1 to 10 μm, an average pore diameter of 0.5 to 20 μm, an average thickness of 0.4 to 1.5 mm, and a positive charge filter having a basis weight of ^{50 to 200 g/m 2 .} According to claim 1,
The second nonwoven fabric has an average fineness of 0.1 to 25 μm, an average pore diameter of 51 to 100 μm, an average thickness of 0.1 to 0.5 mm, and a positive charge filter having a basis weight of ^{15 to 70 g/m 2 .} According to claim 1,
The third nonwoven fabric is a positive charge filter having an average fineness of 0.1 to 25 μm, an average pore diameter of 51 to 100 μm, an average thickness of 0.1 to 0.5 mm, and ^{a basis weight of 30 to 100 g/m 2 .} According to claim 1,
The first to third nonwoven fabrics are positively charged filters that are needle punched or embossed. 6. The method of claim 5,
The positive charge filter is a positive charge filter, characterized in that the surface charge of 5 ~ 50 mV. An adsorption filter for water treatment comprising the positive charge filter according to any one of claims 1 to 8. 10. The method of claim 9,
The first to third nonwoven fabrics included in the positive charge filter are adsorption filters for water treatment, characterized in that they are manufactured in a bent form or a rolling form.