KR101661516B1 - A complex filter and a method manufacturing the same - Google Patents

Abstract

The present invention relates to a composite filter made from a composition comprising 30 to 70% by weight of an airgel and 30 to 70% by weight of a polyethylene binder, and more particularly to a composite filter comprising 5 to 30% by weight of an airgel, 10 to 40% by weight of a polyethylene binder, And 30 to 60% by weight of activated carbon, and performs complex functions of a pre-carbon filter, a membrane filter and a post-carbon filter.
The present invention can provide a composite filter that combines the functions of a pre-carbon filter, a membrane filter, and a post-carbon filter by integrating a pre-carbon filter, a membrane filter, and a post-carbon filter into one filter.
Further, since the present invention includes one filter in the water purifier, the handling is simple and the volume of the water purifier can be drastically reduced.
In addition, the present invention can provide a composite filter capable of improving durability, adsorptivity, flow rate, water purification performance and the like, thereby improving the life of the filter.

Description

Technical Field [0001] The present invention relates to a composite filter and a manufacturing method thereof,

The present invention relates to a composite filter made from a composition comprising 30 to 70% by weight of an airgel and 30 to 70% by weight of a polyethylene binder, and more particularly to a composite filter comprising 5 to 30% by weight of an airgel, 10 to 40% by weight of a polyethylene binder, And 30 to 60% by weight of activated carbon, and performs complex functions of a pre-carbon filter, a membrane filter and a post-carbon filter.

A water purifier is a device for purifying raw water such as tap water or ground water, and converts the raw water into drinking water through various purification methods.

In order to generate an integer, it is necessary to go through processes such as precipitation, filtration and sterilization, and most of the harmful substances are removed through these processes.

Generally, the water purifier has various filters for purifying the raw water. Such filters can be classified into a sedimentation filter, a line carbon filter, a membrane filter, a post-carbon filter, and the like depending on their functions.

The precipitation filter is a filter for precipitating large contaminants or floating substances (soil, rust, sand, etc.) in raw water, and the pre-carbon filter is a filter for reducing particle pollution, residual chlorine, volatile organic compounds, Filter for adsorption and removal.

Membrane filters include a hollow fiber membrane filter and a reverse osmosis membrane filter. The hollow fiber membrane filter can effectively remove ionic substances and microorganisms, while maintaining the beneficial minerals in the human body. In addition, it is possible to minimize the cost and wasted raw water compared with the reverse osmosis membrane filter.

Reverse osmotic membrane filters can be used to effectively remove heavy metals, ionic substances and microorganisms by applying reverse osmosis membranes. However, the reverse osmosis membrane filter is expensive and disadvantageous in that a large amount of raw water is discarded, and minerals useful for the human body are removed.

The post-carbon filter is installed at the rear end of the filter, and is mainly provided to remove odor inducing substances that affect the taste of purified water to improve the water taste.

Korean Patent Laid-Open No. 10-2011-0023351 discloses a water purifier filter in which a synthetic fiber yarn by a spinning method is formed into a cylindrical shape having a hollow portion 110 to form an inner filter body 100); A synthetic fiber yarn by a stretching method is wound around the outer periphery of the inner filter body 100 so as to have a second medium H2 and is gradually expanded from the center diameter of the inner filter body 100 And an outer filter body 200 formed on the outer circumference of the outer filter body 200 such that the concave and convex portions 202 and the concave and convex portions 204 are continuously formed to maximize the surface area in contact with water. .

Korean Patent Laid-Open No. 10-2013-0045641 discloses a carbon block filter formed of commercialized activated carbons and ultrahigh molecular weight polyethylene binders having controlled particle size, and has a particle size distribution of not more than 105 占 퐉 among the particle size distribution of powdered activated carbon and ultrafine molecular weight polyethylene binder having controlled particle size And a cumulative distribution ratio of the particle size is 1: 0.8 to 1.1. The present invention relates to a carbon block filter using an ultra-high molecular weight polyethylene binder having a particle size distribution.

Korean Patent Laid-Open No. 10-2013-0077686 discloses a nonwoven fabric layer; And an activated carbon slurry coating layer formed on one side or both sides of the nonwoven fabric layer.

However, the technique disclosed in the above document has several filters in one water purifier, which is inconvenient to handle and increases the volume of the water purifier.

In addition, there is a drawback that the water quantity and water purification performance of the water purifier are deteriorated and the life of the filter is shortened.

Korean Patent Publication No. 10-2011-0023351 Korean Patent Publication No. 10-2013-0045641 Korean Patent Publication No. 10-2013-0077686

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite filter in which a line carbon filter, a membrane filter, and a post-carbon filter are integrated by a single filter.

Another object of the present invention is to provide a composite filter which can be handled easily and which can drastically reduce the volume of a water purifier by including one filter in the water purifier.

It is another object of the present invention to provide a composite filter which is excellent in durability, adsorptivity, flow rate, water purification performance, etc. and can improve the life of the filter.

In order to achieve the above-mentioned object, the present invention provides a method for producing a carbon fiber filter, which is manufactured from a composition comprising 30 to 70% by weight of an airgel and 30 to 70% by weight of a polyethylene binder, A composite filter is provided.

The present invention also relates to a method of producing a composite material comprising a composition comprising 5 to 30% by weight of an airgel, 10 to 40% by weight of a polyethylene binder and 30 to 60% by weight of powdered activated carbon and performing functions of a pre-carbon filter, a membrane filter and a post- To provide a composite filter.

In one embodiment of the present invention, the aerogel is a silica airgel, the particle size of the silica airgel is 10 to 500 μm, the pore size is 20 to 50 nm, and the porosity is 50 to 99%.

In an embodiment of the present invention, the aerogels and the powdered activated carbon are surface treated with a mixture of an epoxy group-containing silane coupling agent and an acrylate group-containing silane coupling agent.

In one embodiment of the present invention, the composition further comprises 1 to 10% by weight of a silane coupling agent, and the silane coupling agent is a mixture of an epoxy group-containing silane coupling agent and an acrylate group-containing silane coupling agent do.

The present invention also relates to a mixing process for mixing a composition comprising 5 to 30% by weight of an airgel, 10 to 40% by weight of a polyethylene binder and 30 to 60% by weight of powdered activated carbon; A composite filter manufacturing process in which the mixed composition is filled in a mold having an inner core inserted therein, and then the guide ring of the press is pressed to produce a composite filter while pressurizing the composition containing the guide ring; A heat treatment step of heat-treating the entire mold in which the composite filter is formed without withdrawing the composite filter from the mold; A cooling step of cooling the entirety of the heat-treated metal mold; And a separating and cutting step of separating the cooled metal mold and the inner core from each other and withdrawing the composite filter from the metal mold and then cutting it according to the standard. The composite carbon fiber filter, the membrane filter, and the after- A method of manufacturing a filter is provided.

In one embodiment of the present invention, the cooling step is characterized by improving the strength and porosity of the composite filter by quenching by using a gas or a liquid.

The present invention can provide a composite filter that combines the functions of a pre-carbon filter, a membrane filter, and a post-carbon filter by integrating a pre-carbon filter, a membrane filter, and a post-carbon filter into one filter.

Further, since the present invention includes one filter in the water purifier, the handling is simple and the volume of the water purifier can be drastically reduced.

In addition, the present invention can provide a composite filter capable of improving durability, adsorptivity, flow rate, water purification performance and the like, thereby improving the life of the filter.

Figure 1 shows the integer performance of the composite filter of the present invention against a 100 nm silica nano-stock solution. (a) a 100 nm silica nano-stock solution, (b) a third-party hollow fiber membrane, (c) a third filter after the carbon filter, (d)
Figure 2 shows the integer performance of the inventive composite filter against tobacco. (b) filtering with a third-party hollow fiber membrane, (c) filtering with a third-party carbon filter, (d) filtering with a composite filter of the present invention

Hereinafter, the present invention will be described in detail based on examples. It is to be understood that the terminology, examples and the like used in the present invention are merely illustrative of the present invention in order to more clearly explain the present invention and to facilitate understanding of the ordinary artisan, and should not be construed as being limited thereto.

Technical terms and scientific terms used in the present invention mean what the person skilled in the art would normally understand unless otherwise defined.

The present invention relates to a composite filter made from a composition comprising 30 to 70% by weight of an airgel and 30 to 70% by weight of a polyethylene binder and which combines the functions of a pre-carbon filter, a membrane filter and a post-carbon filter.

The aerogels are highly porous nanostructures and are used to adsorb and remove small contaminants, residual chlorine, volatile organic compounds, heavy metals, microorganisms, odor generating factors, and the like.

Examples of the aerogels include silica airgel, alumina aerogels, carbon aerogels, zirconia aerogels, ruthenium aerogels, iron oxide aerogels, magnesium oxide aerogels, tungsten oxide aerogels, zinc oxide aerogels, porous silica, and the like.

The airgel may be heat treated to remove impurities, and the heat treatment temperature is preferably 50 to 500 ° C.

Particularly, silica airgel is preferably used, and silica airgel can be used without limitation such as powder, bead, water dispersion paste and the like.

The particle size of the silica airgel is 10 to 500 μm, the pore size is 20 to 50 nm, and the porosity is preferably 50 to 99%.

Since the pore size of the silica airgel is 20 to 50 nm, the material having a size of 20 nm or more can be efficiently filtered.

When the particle size, pore size, and porosity of the silica airgel satisfy the above-described numerical ranges, the adsorbability, durability and water purification performance of the produced composite filter can be maximized.

When a silica airgel is used, a powdery silica airgel and a water-dispersible paste type silica airgel can be used at the same time in order to improve the adsorptivity and durability. In this case, the weight ratio of the silica airgel in powder form and the silica- Is preferably 70 to 90: 10 to 30.

The polyethylene binder serves as an adhesive for connecting aerogel particles, which prevents dropping of aerogel particles and imparts durability to the filter.

The polyethylene can be used without limitation, such as linear polyethylene, branched polyethylene, dispersed polyethylene, low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and high molecular weight polyethylene (HMWPE).

The polyethylene has a weight average molecular weight of 100,000 to 12,000,000 g / mol from the viewpoints of the adsorptivity and durability of the filter.

Polyethylene having different molecular weights may be mixed and used to improve the adsorptivity and water purification performance of the filter.

For example, polyethylene having a weight average molecular weight of 400,000 to 500,000 g / mol, polyethylene having a weight average molecular weight of 600,000 to 800,000 g / mol, and polyethylene having a weight average molecular weight of 900,000 to 1,000,000 g / mol may be mixed and used.

The content of the aerogels and the polyethylene binder is preferably 30 to 70% by weight of the airgel and 30 to 70% by weight of the polyethylene binder.

If the content of the airgel is less than 30% by weight, the adsorption property is deteriorated. If the content of the airgel is more than 70% by weight, the durability of the filter is deteriorated.

When the content of the polyethylene binder is less than 30% by weight, the binder does not bind effectively with the airgel, so that it is difficult to secure durability of the filter. When the content exceeds 70% by weight, the adsorbability, flow rate and water purification performance are lowered.

The composite filter of the present invention can combine the functions of a pre-carbon filter, a membrane filter, and a post-carbon filter by integrating a pre-carbon filter, a membrane filter, and a post-carbon filter into one filter.

The present invention can simplify the handling and drastically reduce the volume of the water purifier by including one composite filter in the water purifier.

The present invention also relates to a method of producing a composite material comprising a composition comprising 5 to 30% by weight of an airgel, 10 to 40% by weight of a polyethylene binder and 30 to 60% by weight of powdered activated carbon and performing functions of a pre-carbon filter, a membrane filter and a post- To a composite filter.

The aerogels are highly porous nanostructures and are used to adsorb and remove small contaminants, residual chlorine, volatile organic compounds, heavy metals, microorganisms, odor generating factors, and the like.

Examples of the aerogels include silica airgel, alumina aerogels, carbon aerogels, zirconia aerogels, ruthenium aerogels, iron oxide aerogels, magnesium oxide aerogels, tungsten oxide aerogels, zinc oxide aerogels, porous silica, and the like.

The airgel may be heat treated to remove impurities, and the heat treatment temperature is preferably 50 to 500 ° C.

Particularly, silica airgel is preferably used, and silica airgel can be used without limitation such as powder, bead, water dispersion paste and the like.

The particle size of the silica airgel is 10 to 500 μm, the pore size is 20 to 50 nm, and the porosity is preferably 50 to 99%.

Since the pore size of the silica airgel is 20 to 50 nm, the material having a size of 20 nm or more can be efficiently filtered.

When the particle size, pore size, and porosity of the silica airgel satisfy the above-described numerical ranges, the adsorbability, durability and water purification performance of the produced composite filter can be maximized.

When a silica airgel is used, a powdery silica airgel and a water-dispersible paste type silica airgel can be used at the same time in order to improve the adsorptivity and durability. In this case, the weight ratio of the silica airgel in powder form and the silica- Is preferably 70 to 90: 10 to 30.

The polyethylene binder serves as an adhesive for connecting aerogel particles, which prevents dropping of aerogel particles and imparts durability to the filter.

The polyethylene can be used without limitation, such as linear polyethylene, branched polyethylene, dispersed polyethylene, low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and high molecular weight polyethylene (HMWPE).

The polyethylene has a weight average molecular weight of 100,000 to 12,000,000 g / mol from the viewpoints of the adsorptivity and durability of the filter.

Polyethylene having different molecular weights may be mixed and used to improve the adsorptivity and water purification performance of the filter.

For example, polyethylene having a weight average molecular weight of 400,000 to 500,000 g / mol, polyethylene having a weight average molecular weight of 600,000 to 800,000 g / mol, and polyethylene having a weight average molecular weight of 900,000 to 1,000,000 g / mol may be mixed and used.

The powdered activated carbon is used for adsorbing and removing residual chlorine, volatile organic compounds, odor generating factors, and the like.

The content of the aerogels, the polyethylene binder and the powdered activated carbon is preferably 5 to 30% by weight of the airgel, 10 to 40% by weight of the polyethylene binder and 30 to 60% by weight of the powdery activated carbon.

If the content of the airgel is less than 5% by weight, the adsorption property is deteriorated. If the content is more than 30% by weight, the durability of the filter is lowered.

If the content of the polyethylene binder is less than 10% by weight, the binder can not bind effectively with the airgel and the powdered activated carbon, so that the durability of the filter is difficult to secure. If the content exceeds 40% by weight, the adsorbability,

When the content of the powdered activated carbon is less than 30 wt%, it is difficult to secure the adsorption characteristics, while when it exceeds 60 wt%, the durability and the water purification performance are rather deteriorated.

The composite filter of the present invention can combine the functions of a pre-carbon filter, a membrane filter, and a post-carbon filter by integrating a pre-carbon filter, a membrane filter, and a post-carbon filter into one filter.

The present invention can simplify the handling and drastically reduce the volume of the water purifier by including one composite filter in the water purifier.

The airgel and the powdered activated carbon may be surface treated with a silane coupling agent and used.

The silane coupling agent has an organic functional group capable of binding with an organic compound, and a hydrolyzable group capable of reacting with an inorganic substance, and is characterized in that the adsorbability, durability, flow rate, And the water purification performance can be remarkably improved.

As the silane coupling agent, an alkyl group-containing silane coupling agent, an amino group-containing silane coupling agent, an epoxy group-containing silane coupling agent, an acrylate group-containing silane coupling agent, an isocyanate group-containing silane coupling agent, a mercapto group- Coupling agent, vinyl group-containing silane coupling agent, and the like can be used without limitation.

The aerogels and the powdered activated carbon are preferably surface-treated with a mixture of an epoxy group-containing silane coupling agent and an acrylate group-containing silane coupling agent in view of durability and adsorptivity of the filter.

The mixed silane coupling agent is preferably composed of 60 to 90% by weight of an epoxy group-containing silane coupling agent and 10 to 40% by weight of an acrylate group-containing silane coupling agent.

The amount of the silane coupling agent to be surface-treated is preferably 1 to 10 parts by weight based on 100 parts by weight of the aerogels or the powdered activated carbon. When the content is less than 1 part by weight, it is difficult to expect an improvement in adhesion. When the amount exceeds 10 parts by weight, The use of a ring agent deteriorates interface adhesion properties and durability.

The composition may further contain 1 to 10% by weight of a silane coupling agent. When the content is less than 1% by weight, the effect of addition is insignificant. When the content exceeds 10% by weight, durability is decreased.

The silane coupling agent is preferably a mixture of an epoxy group-containing silane coupling agent and an acrylate group-containing silane coupling agent.

The mixed silane coupling agent is preferably composed of 60 to 90% by weight of an epoxy group-containing silane coupling agent and 10 to 40% by weight of an acrylate group-containing silane coupling agent.

The composition may further comprise 1 to 5% by weight of a silane coupling agent oligomer prepared by previously reacting an epoxy group-containing silane coupling agent and an acrylate group-containing silane coupling agent.

By using the silane coupling agent oligomer, the processability, durability, adsorptivity, etc. of the composite filter can be improved.

The silane coupling agent oligomer preferably has a weight average molecular weight of 1,000 to 5,000 g / mol. When the content of the silane coupling agent oligomer is less than 1% by weight, the effect of addition is insignificant. When the content of the silane coupling agent oligomer exceeds 5% by weight, do.

The composition may further comprise sodium silicate and potassium silicate.

The sodium silicate is used for imparting adhesiveness and processability, and can be used as a solid or as a solution.

The content of sodium silicate is preferably 1 to 5% by weight, and if the content is less than 1% by weight, the effect of addition is insignificant. If the content exceeds 5% by weight, durability is lowered.

Potassium silicate is excellent in adhesiveness and can improve the compatibility and meltability of the composition.

The content of potassium silicate is preferably 1 to 5% by weight, and if the content is less than 1% by weight, the effect of addition is insignificant. If the content exceeds 5% by weight, miscibility of the composition is lowered, I will not.

The composition may further comprise grafted polyethylene grafted with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, and the like.

The graft polyethylene can remarkably improve the adsorption power, durability, flow rate and water purification performance of the composite filter manufactured by improving the interfacial adhesion between the airgel, the powdered activated carbon and the polyethylene binder.

The content of the grafted polyethylene is preferably 1 to 5% by weight, and if the content is less than 1% by weight, the effect of addition is insignificant. If the content is more than 5% by weight, durability is lowered.

The composition of the present invention can be used in a wide range of applications such as fiber activated carbon, ceramic powders (titanium dioxide, silica, alumina, zeolite, etc.), antibacterial agents (silica, alumina, zeolite, bentonite, silver powder, charcoal, loess, tourmaline, Surfactants, plasticizers, lubricants, defoamers, thickeners, catalysts, diluents, dispersants, leveling agents, crosslinking agents, pH adjusting agents, pigments, wetting agents, antioxidants, antistatic agents, mold release agents and the like.

The present invention also relates to a mixing process for mixing a composition comprising 5 to 30% by weight of an airgel, 10 to 40% by weight of a polyethylene binder and 30 to 60% by weight of powdered activated carbon;

A composite filter manufacturing process in which the mixed composition is filled in a mold having an inner core inserted therein, and then the guide ring of the press is pressed to produce a composite filter while pressurizing the composition containing the guide ring;

A heat treatment step of heat-treating the entire mold in which the composite filter is formed without withdrawing the composite filter from the mold; A cooling step of cooling the entirety of the heat-treated metal mold; And a separating and cutting step of separating the cooled metal mold and the inner core to withdraw the composite filter from the metal mold,

The present invention relates to a method of manufacturing a composite filter that performs a composite function of a carbon filter, a membrane filter, and a post-carbon filter.

The mixing process is a process for uniformly mixing a composition containing 5 to 30% by weight of an airgel, 10 to 40% by weight of a polyethylene binder and 30 to 60% by weight of powdered activated carbon, wherein the airgel and the powdered activated carbon are uniformly distributed in a polyethylene binder The water purification function can be efficiently demonstrated.

When the composition is stirred in the mixing process, it is preferable to gradually increase the stirring speed from a low speed to a high speed for a certain period of time in order to improve the purification performance of the filter.

For example, it is preferable that the composition is stirred at 2,000 ~ 3,500 rpm, then gradually increased at 4,000 ~ 6,000 rpm, and the stirring time is preferably 10 ~ 30 minutes at low speed.

The composite filter manufacturing process is a process for manufacturing a composite filter by filling a mixed composition into a mold. After inserting an inner core for forming a water hole of a composite filter into an aluminum mold, the mixed composition is put into a mold, A press is used to press the guide ring downward at 2 to 50 atmospheres to produce a composite filter.

The heat treatment process is a process of heat-treating the entire mold in which the composite filter is molded. The process is performed without withdrawing the composite filter in the mold, and the heat treatment is performed at 90 to 250 ° C for 1 to 10 hours.

The cooling step is a step of cooling the entirety of the heat-treated metal mold, and the metal mold is cooled through various cooling means.

It is preferable that the cooling step is quenched by using a gas or a liquid to improve the strength and the porosity of the composite filter.

The separating and cutting process is a process of cutting the manufactured composite filter from the mold and then cutting it according to the standard. Using a separate jig, the outer mold and the inner core are separated, the composite filter is taken out from the mold, And the composite filter is cut to meet the specified standard.

The composite filter may function as a line carbon filter, a membrane filter, and a post-carbon filter by integrating a line carbon filter, a membrane filter, and a post-carbon filter into one filter.

The airgel contained in the composite filter is a highly porous nanostructure, and particles can effectively adsorb the filter by effectively adsorbing small contaminants, residual chlorine, volatile organic compounds, heavy metals, microorganisms, odor generating factors, etc. (FIGS. 1 and 2 ).

In addition, by providing one composite filter in the water purifier, the handling is simple and the volume of the water purifier can be drastically reduced.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. The following examples are intended to illustrate the practice of the present invention and are not intended to limit the scope of the present invention.

(Example 1)

A composition comprising 40% by weight of silica airgel and 60% by weight of polyethylene binder was mixed.

The mixed composition was filled in an aluminum mold having an inner core inserted therein, followed by pressurizing the guide ring of the press to produce a composite filter while pressurizing the mixture containing the guide ring.

The entire mold in which the composite filter was molded without withdrawing the composite filter from the mold was heat-treated at 150 ° C for 1 hour.

The entirety of the heat-treated mold was cooled to room temperature.

The cooled mold and the inner core were separated, and the composite filter was taken out of the mold and cut according to the standard.

(Example 2)

A composite filter was prepared in the same manner as in Example 1, except that 15 wt% of silica airgel, 35 wt% of polyethylene binder and 50 wt% of powdered activated carbon were used.

(Example 3)

Except that a silica airgel surface-treated with a mixed silane coupling agent consisting of 70% by weight of 3-glycidoxypropyltrimethoxysilane and 30% by weight of 3-methacryloxypropyltrimethoxysilane and powdered activated carbon were used A composite filter was prepared in the same manner as in Example 2.

(Example 4)

A mixed silane consisting of 15% by weight of silica airgel, 35% by weight of polyethylene binder, 45% by weight of powdery activated carbon, 70% by weight of 3-glycidoxypropyltrimethoxysilane and 30% by weight of 3-methacryloxypropyltrimethoxysilane A composite filter was prepared in the same manner as in Example 2 except that 5% by weight of a coupling agent was used.

(Example 5)

70 parts by weight of 3-glycidoxypropyltrimethoxysilane and 30 parts by weight of 3-methacryloxypropyltrimethoxysilane were reacted at 60 DEG C for 24 hours to prepare a silane coupling agent oligomer having a molecular weight of 4,000 g / mol.

A composite filter was prepared in the same manner as in Example 2, except that 15 wt% of silica airgel, 35 wt% of polyethylene binder, 47 wt% of powdered activated carbon and 3 wt% of the silane coupling agent oligomer were used.

(Example 6)

A composite filter was prepared in the same manner as in Example 2, except that 15 wt% of silica airgel, 35 wt% of polyethylene binder, 47 wt% of powdered activated carbon and 3 wt% of grafted polyethylene grafted with maleic acid were used.

(Comparative Example 1)

A composite filter was prepared in the same manner as in Example 2, except that 40 wt% of a polyethylene binder and 60 wt% of powdered activated carbon were used.

(Comparative Example 2)

A composite filter was prepared in the same manner as in Example 2 except that 2 wt% of silica airgel, 35 wt% of polyethylene binder and 63 wt% of powdered activated carbon were used.

(Comparative Example 3)

A composite filter was prepared in the same manner as in Example 2, except that 35 wt% of silica airgel, 35 wt% of polyethylene binder and 30 wt% of powdered activated carbon were used.

The properties of the composite filters prepared from the above Examples and Comparative Examples were measured and the results are shown in Table 1 below.

The chlorine removal rate of the composite filter was obtained by supplying chlorine of raw water at 2 ppm, measuring the residual chlorine concentration of the filtered water after 60 minutes with a residual chlorine analyzer, and calculating the removal rate by the following equation.

Removal rate = (chlorine concentration of raw water - raw water concentration of filtered water) / chlorine concentration of raw water

The durability of the composite filter was determined by observing the condition of the composite filter after immersing the composite filter in water at 20 ° C for 7 days.

division Example Comparative Example One 2 3 4 5 6 One 2 3 Chlorine removal rate (%) 96.1 96.7 98.6 98.8 97.9 98.1 92.7 94.3 94.6 durability Good Good eminence eminence eminence eminence Bad Bad Bad

From the results shown in the above Table 1, the composite filters of Examples 1 to 6 are excellent in adsorptivity, durability, water purification performance, and can perform the functions of a pre-carbon filter, a membrane filter, and a post-carbon filter.

On the other hand, the composite filters of Comparative Examples 1 to 3 are inferior in adsorptivity, durability and water purification performance to those of Examples.

Claims (7)

delete 5 to 30% by weight of an airgel;
10 to 40% by weight of a polyethylene binder; And
From 30 to 60% by weight of powdered activated carbon,
The aerogels are used after being heat-treated at 50 to 500 ° C,
The polyethylene binder is a mixture of polyethylene having a weight average molecular weight of 400,000 to 500,000 g / mol, polyethylene having a weight average molecular weight of 600,000 to 800,000 g / mol, and polyethylene having a weight average molecular weight of 900,000 to 1,000,000 g / mol,
Composite filter that combines the functions of a pre-carbon filter, a membrane filter and a post-carbon filter.
3. The method of claim 2,
The airgel is a silica airgel,
Wherein the silica airgel has a particle size of 10 to 500 μm, a pore size of 20 to 50 nm, and a porosity of 50 to 99%.
3. The method of claim 2,
Wherein the aerogels and the powdered activated carbon are surface treated with a mixture of an epoxy group-containing silane coupling agent and an acrylate group-containing silane coupling agent.
3. The method of claim 2,
Wherein the composition further comprises 1 to 10% by weight of a silane coupling agent, wherein the silane coupling agent is a mixture of an epoxy group-containing silane coupling agent and an acrylate group-containing silane coupling agent.
Mixing a composition comprising 5 to 30 wt% of an airgel, 10 to 40 wt% of a polyethylene binder, and 30 to 60 wt% of powdered activated carbon;
A composite filter manufacturing process in which the mixed composition is filled in a mold having an inner core inserted therein, and then the guide ring of the press is pressed to produce a composite filter while pressurizing the composition containing the guide ring;
A heat treatment step of heat-treating the entire mold in which the composite filter is formed without withdrawing the composite filter from the mold;
A cooling step of cooling the entirety of the heat-treated metal mold; And
Separating the cooled metal mold and the inner core to separate the composite filter from the metal mold,
The aerogels are used after being heat-treated at 50 to 500 ° C,
The polyethylene binder is a mixture of polyethylene having a weight average molecular weight of 400,000 to 500,000 g / mol, polyethylene having a weight average molecular weight of 600,000 to 800,000 g / mol, and polyethylene having a weight average molecular weight of 900,000 to 1,000,000 g / mol,
A carbon filter, a membrane filter, and a post-carbon filter.
The method according to claim 6,
Wherein the cooling step is quenched by using a gas or a liquid to improve the strength and the porosity of the composite filter.

Images