KR100625203B1 - Method for manufacturing chemical filter for air cleaning of hot-melting type - Google Patents

Abstract

The present invention relates to a method for manufacturing a chemisorbent filter for hot-melting air purification, and more specifically, to a polyolefin-based polymer or a polyamide-based polymer by mixing an adhesive and melting at a temperature of 100 to 250 ℃ to form a hot-melting network foam Manufacturing a sheet-like skeleton base material; Adsorbing the adsorbent to the skeleton substrate; And by using a chemical adsorption filter comprising a step of forming a skeletal substrate to which the adsorbent is adsorbed to produce a filter body, thereby preventing dust and secondary pollution of the chemical adsorption filter and improving the performance of the filter. The adsorbent is evenly adsorbed on the skeletal base made of the network foam of the melt, which can efficiently purify the air.

Compound Adsorption Filter, Hot Melting, Polyolefin, Polyamide, Adsorbent

Description

Method for manufacturing chemical filter for air cleaning of air cleaning of hot-melting type

1 is a cross-sectional view showing a method for manufacturing by directly discharging a skeleton base material from the nozzle,

Figure 2a is a state in which the adsorbent is adsorbed by making the unit shape of the skeletal substrate according to the present invention in a rectangular mesh shape,

2b is a state diagram in which the unit shape of the skeletal substrate according to the present invention is manufactured in a circular mesh shape to adsorb the adsorbent.

The present invention is economical and does not harm the chemical adsorption filter dust and secondary pollution, and not only improves the performance of the filter, but also the adsorption agent is evenly adsorbed on the skeletal substrate made of the hot-melting network foam can efficiently air purification The present invention relates to a method for producing a chemical adsorption filter for hot-melting air purification.

Generally, a semiconductor manufacturing process, a building, etc. are equipped with the purification apparatus like an air cleaner. In recent years, purifiers have been chemically adsorbed to chemically remove various harmful substances contained in the fluid, such as acidic gases, alkaline gases or volatile hazardous organic compounds, in a situation where the fluid is flowing at a predetermined speed. Many filters are used.

Such chemisorption filters are manufactured considering the following conditions, which are important factors in determining performance and quality. First, whether to secure the removal efficiency and removal capacity of harmful substances. Secondly, whether the filter is worn out and the particles are generated by physical shocks such as vibration or wind speed. Third, whether the pressure loss of the fluid passing through the chemisorption filter during the filtration action can be minimized. Fourth, secondary pollution caused by the adsorbent used for filtration.

As typical chemical adsorption filters, activated carbon-adsorption adsorption filters are frequently used for the purpose of removing acidic and alkaline substances contained in air. The impregnated adsorption filter is prepared by attaching a substance having a large surface area and a large pore volume or reacting with harmful substances to be removed, such as phosphoric acid, potassium hydroxide or potassium permanganate, by attaching an acidic or alkaline substance.

However, such chemisorption filters produce salts by acid-alkali neutralization reactions during the purification of the impregnated substances to remove harmful substances. As the purification time increases, the amount of salts increases, thus preventing the pores of the chemisorption filters. Therefore, the fluid causes a pressure loss of the fluid passing through the filter for purification, that is, a decrease in the flow pressure, so that the longer the purification time, the lower the function of the filter.

In addition, since the impregnated acidic and alkaline materials have high volatility, secondary contamination may occur due to volatilization of these impregnated materials, which may cause problems that cannot be used in a clean room of a semiconductor manufacturing equipment requiring a very high cleanliness. Was done.

On the other hand, by using activated carbon, a chemical adsorption filter for ozone decomposition is disclosed in Korean Patent Application No. 2001-087854. The ozone decomposing chemical adsorption filter is attached to the activated carbon particles to polyethylene or aluminum mesh to propose a low-cost and efficient air filter.

However, the ozone decomposing chemisorption filter still has a risk of secondary generation due to dust generation or impingement due to impact and abrasion, which makes it difficult to apply to clean rooms of semiconductor equipment requiring cleanliness.

In order to compensate for the risk of secondary pollution by dust generation and volatilization of impregnated substances, which are disadvantages of conventional chemisorption filters using activated carbon, recently, ion exchange in the form of particles or fibers in which dust generation and adsorption substances have a low risk Resin and activated carbon fibers have been proposed as new materials for chemisorption filters.

For example, Korean Patent Application No. 1999-72765 discloses a chemisorption filter in which a net polyurethane foam having continuous pores is used as a support and an impregnated activated carbon or an ion exchange resin is attached thereto.

In order to reduce the pressure loss of the flow fluid and to improve the adsorption and removal of toxic substances, the foamed chemisorption filter must consider structural properties such as the shape, size, and spatial distribution of pores in addition to the physical properties of the foam. Since the foam is thinner than several millimeters in thickness, it is difficult to process and it is difficult to uniformly attach the adsorbent to the pore surface formed inside the foam as necessary.

In addition, in order to eliminate dust and secondary pollution, chemical adsorption filters that give adsorption performance or ion exchange capacity to a nonwoven fabric made of fibers are used. However, these nonwoven type chemisorption filters have excellent performance against dust and secondary contamination, but they are nonwoven fabrics. Due to the inherent physical characteristics, the pressure loss of the fluid during the flow of the fluid is high, which is disadvantageous for application to an air purifier having a high surface wind velocity.

Therefore, there is an urgent need to manufacture a chemical adsorption filter capable of improving the performance of the filter as it does not harm dust and secondary pollution of the chemisorption filter, and improve the air purification effect by adsorbing the adsorbent evenly on the skeletal substrate.

In order to overcome the problems of the prior art, the present invention is economical and does not harm the dust and secondary pollution of the chemisorption filter not only improves the performance of the filter, but also the adsorbent is evenly distributed on the skeletal substrate made of a mesh of hot melting It is an object of the present invention to provide a method for producing a chemical adsorption filter for hot-melting air purification that can be adsorbed and efficiently purifies air.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. In addition, the objects and advantages of the present invention can be realized by the means and combinations indicated in the claims.

In order to achieve the above object, the present invention is a process for producing a sheet-like skeletal substrate made of a hot-melting network foam by mixing an adhesive to a polyolefin-based polymer or a polyamide-based polymer by melting at 100 to 250 ℃ temperature; Adsorbing an adsorbent on the skeletal substrate; And it provides a method for producing a hot-melting type air purification chemical adsorption filter, characterized in that it comprises a step of forming a filter medium by adsorbing the skeleton substrate adsorbed.

In addition, the polyolefin-based polymer is a homo- or copolymers of α-olefin having a carbon atom of 2 to 6; Copolymers of vinyl acetate or acrylic acid esters with α-olefins having 2 to 6 carbon atoms; And mixtures of these polymers.

In addition, the polyamide is preferably selected from the group consisting of nylon 6, nylon 6.6, nylon 6.9, nylon 6.10, nylon 6.12, nylon 11, nylon 12 and amorphous nylon.

Here, the adsorbent is preferably selected from the group consisting of porous ion exchange resin, porous organic-inorganic composite adsorbent, impregnated activated carbon and porous inorganic adsorbent.

In addition, the water content of the adsorbent is preferably 10 to 35% by weight.

Furthermore, the adhesive is preferably polybutene or gum rosin, but is not limited thereto and includes adhesives generally available in the art.

In addition, it is preferable to include 3 to 10 parts by weight of the adhesive with respect to 100 parts by weight of the polyolefin-based polymer or polyamide-based polymer.

In addition, there is provided a hot-melting type air adsorption chemical adsorption filter produced by the manufacturing method.

Hereinafter, the present invention will be described in more detail.

Hot-melting network foam of the present invention is a polyolefin-based polymer such as polypropylene, polyethylene, polyisobutylene or polyamide-based polymer such as nylon 6, nylon 6.6 mixed with an adhesive such as gum rosin, polybutene After melting at a temperature of 100 to 250 ℃ to prepare a sheet-like skeleton substrate.

Next, an adsorbent having a thickness of 0.3-2.0 mm is adsorbed on the skeleton substrate, and the filter substrate is manufactured by molding the skeleton substrate on which the adsorbent is adsorbed. At this time, 3-10 parts by weight of the adhesive is mixed with 100 parts by weight of the polyolefin-based polymer or the polyamide-based polymer.

Here, the polyolefin-based polymer is an olefin having a double bond at the terminal capable of free polymerization, preferably polyethylene, polypropylene, polyisobutylene. Further, the polymer of 4-methylpentene synthesized from propylene shows excellent properties as polymethylpentene and methylpentene resin. It is also the lightest plastic with a density of 0.83. It has a heat resistance of melting point 350 ℃ and heat deformation temperature of 200 ℃ and the same transparency as methacryl resin.

More specifically, the polyolefin-based polymers usable in the invention are homopolymers of α-olefins having 2 to 6 carbon atoms such as polyethylene, polypropylene, polyisopropylene, polybutylene or poly (4-methylpentene) or their Copolymers or copolymers of comonomers such as vinyl acetate or acrylic esters with α-olefins having 2 to 6 carbon atoms and mixtures of these polymers, preferably polyethylene, polypropylene do.

In addition, the polyamide-based polymer is a fiber made by forming a peptide bond between the amino group and the carboxy group when the nylon is made, preferably nylon 6, nylon 66. The polyamide-based nylon is tougher than natural fibers and does not absorb sweat well, and static electricity is generated by friction. Therefore, it is not suitable for cloth and is used as a material for toothbrush wire insulation, netting, and rope.

In addition, the polyamides usable in the present invention may be selected from the group consisting of nylon 6, nylon 6.6, nylon 6.9, nylon 6.10, nylon 6.12, nylon 11, nylon 12 and amorphous nylon, preferably nylon 6, Nylon 6.6 is used.

On the other hand, the process for producing a sheet-like skeleton base material made of hot-melting network foam can be divided into a transfer method and a method of direct discharge from the nozzle.

1 is a cross-sectional view showing a method for manufacturing by directly discharging the skeleton substrate according to the present invention, Figure 2a is a state in which the unit shape of the skeleton substrate according to the present invention in the form of a square mesh adsorbing the adsorbent, Figure 2b Is a state diagram of adsorbing the adsorbent by making the unit shape of the skeleton substrate according to the present invention in a circular mesh shape.

Referring first to Figure 1, Figure 1 is a cross-sectional view showing a method for manufacturing by directly discharging the skeleton base material from the nozzle. As shown, by discharging the hot-melting skeletal base material from the nozzle in the horizontal and longitudinal direction, it is possible to manufacture a checkerboard-shaped skeletal base material, by spray-injecting an adsorbent to the surface of the skeletal base material to produce a filter medium of the network foam do.

2A is a state diagram in which the unit shape of the skeletal base material according to the present invention is manufactured in a rectangular mesh shape to adsorb the adsorbent, and the skeletal base material having a square mesh shape is obtained by pushing the hot-melting skeletal base material into a roller having a rectangular mesh shape. To prepare, by spraying the adsorbent on the surface of the skeletal substrate to prepare a filter medium of the reticular foam.

2B is a state diagram in which the unit shape of the skeletal base material according to the present invention is manufactured in a circular mesh shape, and the adsorbent is adsorbed. The skeletal base material having a circular mesh shape is transferred by pushing the hot-melting skeletal base material into a roller having a circular mesh shape. To prepare, by spraying the adsorbent on the surface of the skeletal substrate to prepare a filter medium of the reticular foam.

The adhesive uses gum rosin, polybutene, and may further use an oily adhesive, an aqueous adhesive, and the like, and preferably, gumrosin, polybutene.

The adsorbent may be selected from the group consisting of porous ion exchange resin, porous organic-inorganic composite adsorbent, impregnated activated carbon, and porous inorganic adsorbent. In addition, the water content of the adsorbent selected from the group is preferably 10 to 35% by weight.

These adsorbents are prepared in spherical, granule injection or extrudate, wherein the average particle diameter (d) of the adsorbent is produced in various shapes and sizes within the range of 0.05-2.00 mm. Can be. These adsorbents are used to select any one of the adsorbents according to the harmful substances to be removed.

For example, harmful gases are HF, HCl, SO _X Alkaline ion exchange resins, organic-inorganic composite adsorbents, impregnated activated carbon, or zeolites are effective in acidic gases such as acidic gases, and acidic ion exchange resins, organic-inorganic complex adsorbents, and impregnated activated carbons in the case of alkaline harmful gases such as ammonia. Or using zeolite is effective.

In addition, in the case of volatile organic compounds such as organic amines, organic solvents, ozone, dioxin, and phthalate plasticizers such as DOP, it is difficult to remove adsorption by acid-alkaline neutralization, and to remove harmful substances by capillary phenomenon caused by fine pores. In this case, a porous adsorbent having a high specific surface area of 500 m ² / g or more, such as impregnated activated carbon or zeolite, is used.

Ion exchange resin type adsorbents are porous adsorbents with a specific surface area of 300 m ² / g or more, and are classified into anionic and cationic exchange resins according to the types of functional groups attached to the resin surface. These ion exchange resin type adsorbents have a spherical shape with an average particle diameter (d) of 0.1-1.5 mm, and ion exchange capacity is 1.0-4.0 equivalents / kg. You will live.

The organic-inorganic composite adsorbent is an adsorbent obtained by grafting an organic adsorbent component having a functional group on a porous inorganic carrier having a large surface area. Here, as the inorganic carrier, a material having a specific surface area of 300 m ² / g or more, for example, silica, alumina, zeolite or mesoporous material (MCM-41, etc.) is used, and the average particle size is 0.05-0.20 mm. It is produced in the form or sphere. In addition, examples of the organic material for attaching the inorganic carrier include a functional group having an -OH group such as -RSO ₃ H or RNH ₄ OH, and the organic component is prepared by grafting the inorganic carrier surface with a coupling agent such as an alkyl silane. do.

Impregnated activated carbon produces granular injection- or extruded activated carbon having a high specific surface area with a specific surface area of 1,000 m ² / g or more and an average particle diameter of 0.05-2.00 mm. For example, it is prepared by attaching an adsorbent such as Kl or H ₃ PO ₃ .

The porous inorganic adsorbent is prepared by ion-exchanging the inorganic carrier used in the aforementioned organic-inorganic composite adsorbent with NH ₄ OH, KOH, Co (NO ₃ ) ₂ , and the like.

Meanwhile, the hot-melting type air adsorption chemical adsorption filter manufactured as described above may be used in a clean room during a semiconductor process or a display manufacturing process, an air purifier, an incinerator, and a chemical manufacturing process of a general building.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited by these examples.

<Example 1> Preparation of hot-melting network chemisorption filter adsorbing cation exchange resin

500 g of polyolefin-based polymer (Daelim Industrial Co., Ltd., PB-1300, molecular weight 1300) and 500 g of polyamide-based polymer (Capro, Polyamide) 50 g of adhesive (Daelim Industrial Co., Ltd., gum rosin) After mixing, the mixture was melted at 180 ° C. for 5 minutes to prepare a skeletal substrate, and 3.0 kg / m ² of a cation exchange resin (Samyang, SK-1BH) having a thickness of 0.8 mm was adsorbed. At this time, a hot-melting network chemisorption filter having a size of 610 x 610 mm, a thickness of 20 mm, and a mesh spacing of 1.3 x 1.3 mm was prepared.

<Example 2> Preparation of hot-melting network chemisorption filter adsorbing anion exchange resin

It was prepared in the same manner as in Example 1 except that 3.1 kg / m ² of anion exchange resin (Samyang, SA-20AP) was used instead of the cation exchange resin.

<Example 3> Preparation of hot-melting network chemisorption filter adsorbed activated carbon

It was prepared in the same manner as in Example 1, except that activated carbon (Daelim Carbon Industry Co., Ltd., specific surface area 1100 m ² / g, average particle diameter 1.3 mm) was used instead of the cation exchange resin. The amount of activated carbon used at this time was 2.2 kg / m ² .

<Comparative Example 1> Preparation of network chemisorption filter adsorbing cation exchange resin

After impregnating and drying the water-soluble adhesive on the mesh-type polyurethane skeletal substrate, 3.0 kg / m ² of a cation exchange resin (Samyang Corp., SK-1BH) having a thickness of 0.8 mm was adsorbed to a size of 610 × 610 mm and a thickness of 20 mm A mesh chemisorption filter having a mesh spacing of 1.3 × 1.3 mm was prepared.

Experimental Example 1 Performance Evaluation of Chemical Adsorption Filter

The performance of the chemisorption filter prepared in the above example was evaluated by the removal rate of the harmful gas and the ion exchange capacity according to the type of adsorbent and the adsorbent dose. In Comparative Example 1, a mesh type chemisorption filter was used instead of the hot-melting network foam.

Adsorbent dosage is the adsorbent material is put filtered per 1 m ² absorbent attachment calculated value of 3.0-3.2 kg, harmful gas removal rate surface wind speed 0.5 m / sec, a relative humidity of 40%, the number of ppm of harmful gas concentration to several tens ppb In the case of the cation exchange resin, the adsorbent shows the removal rate of ammonia, and the anion exchange resin shows the removal rate of sulfur dioxide, the activated carbon or the case of the organic-inorganic composite adsorbent.

Thickness (mm) Sorbent type Adsorbent Input (kg / m ² ) Hazardous Gas Removal Rate (%) Ion exchange capacity (equivalent / m ² ) Example 1 20 Cation Exchange Resin 3.0 98.8 3.63 Example 2 20 Anion exchange resin 3.1 98.3 2.35 Example 3 20 Activated carbon 2.2 99.5 - Comparative Example 1 20 Cation Exchange Resin 3.0 96.8 3.63

As shown in Table 1, the chemical adsorption filter of the present invention is improved in the harmful gas removal rate compared to the chemical adsorption filter of the comparative example that does not manufacture the hot-melting network foam.

As described above, by using the manufacturing method of the chemical adsorption filter for hot-melting air purification according to the present invention, the adsorbent is uniformly adsorbed to the skeletal base material made of the hot-melting network foam to efficiently purify the air.

Therefore, the hot-melting type air adsorption chemical adsorption filter manufactured as described above may be used in a clean room in a semiconductor process or a display manufacturing process, an air purifier, an incinerator, and a chemical manufacturing process of a general building.

Claims (8)

Preparing a sheet-like skeletal substrate made of a hot-melting network foam by mixing an adhesive to a polyolefin-based polymer or a polyamide-based polymer and melting at 100 to 250 ° C .; Adsorbing an adsorbent on the skeletal substrate; And The method of manufacturing a hot-melting air purification chemical adsorption filter comprising the step of forming a filter medium by molding the skeleton substrate adsorbed by the adsorbent. The method of claim 1, The polyolefin-based polymer is a homo- or copolymer of α-olefin having a carbon atom of 2 to 6; Copolymers of vinyl acetate or acrylic acid esters with α-olefins having 2 to 6 carbon atoms; And Method for producing a hot-melting air purifying chemisorption filter, characterized in that selected from the group consisting of a mixture of these polymers. The method of claim 1, wherein the polyamide-based polymer is selected from the group consisting of nylon 6, nylon 6.6, nylon 6.9, nylon 6.10, nylon 6.12, nylon 11, nylon 12 and amorphous nylon chemisorption for air melting type Method for producing a filter. The method of claim 1, The adsorbent is a method of manufacturing a chemical adsorption filter for hot-melting air purification, characterized in that selected from the group consisting of porous ion exchange resin, porous organic-inorganic composite adsorbent, impregnated activated carbon and porous inorganic adsorbent. The method of claim 1, The water content of the adsorbent is 10 to 35% by weight of the manufacturing method of the chemical adsorption filter for hot-melting air purification, characterized in that. The method of claim 1, The adhesive is a polybutene (Polybutene) or gum rosin (Gum rosin) characterized in that the manufacturing method of the chemical adsorption filter for hot-melting air purification. The method of claim 1, Method for producing a hot-melting type air purification chemical adsorption filter, characterized in that it comprises 3 to 10 parts by weight of the adhesive with respect to 100 parts by weight of the polyolefin-based polymer or polyamide-based polymer. Hot-melting air purification chemical adsorption filter manufactured by the method of any one of claims 1 to 7.

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