JP2011083674A - Electrode plate and dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode plate of a dust collection section, which ensures a sufficiently high mechanical strength, and of which surface resistivity is freely controlled, and which prevents sparks even when oil is deposited and ensures high dust-collection performance, and also to provide a dust collector. <P>SOLUTION: This invention relates to the electrode plate which is used in the dust collection section of the dust collector and constituted so that the electrode plate is laminated at fixed intervals, wherein a different voltage is alternately applied to each of the laminated electrode plates. The electrode plate of the dust collection section which has high strength and prevents sparks even when oil is deposited and ensures high dust-collection performance is obtained by providing a half-conductive film having crosslinked polyalkylene oxide and a surface resistivity of 10<SP>7</SP>-10<SP>12</SP>Ω/square order, on an insulative substrate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a dust collector that removes particulate suspended matter in the air in the field of air cleaning, and an electrode plate used therefor.

  Particulate suspended matter in the air, that is, dust, has been known as a cause of illnesses such as asthma and has been a target for removal in the past, but in recent studies, the particle size is 2.5 micrometers or less. There is a report that dust (so-called PM2.5) may induce diseases such as lung cancer, and further improvement of the collection technology is required. Among them, dust collectors that use electrostatic precipitating technology are excellent at collecting small particles with a particle size of micrometer or less, and have a low-pressure loss characteristic. There is a need for improved performance.

  Conventionally, as this type of dust collector, a charging unit that charges dust by discharge is provided on the upstream side, electrode plates are stacked, and different voltages are applied alternately to form an electric field to collect charged dust. What provided the dust collection part in the downstream is known. An example of a dust collector to which this configuration is applied is shown in Patent Document 1. Hereinafter, the dust collector will be described with reference to FIG. As shown in FIG. 9, the charging unit 101 includes a linear charging unit discharge electrode 102 and a charging unit counter electrode plate 103, and an electrode plate A 105 and an electrode plate B 106 are fixed on the downstream side of the charging unit 101. The dust collecting portions 104 are alternately stacked with an interval of. Usually, in the charging unit 101, either a positive or negative voltage of 4 to 15 kV is applied to the discharge electrode 102 for the purpose of causing a corona discharge described later between the discharge electrode 102 and the counter electrode plate 103, and the counter electrode plate 103. A voltage of 0 kV is applied by the high voltage power source 107. Further, in the dust collection unit 104, a positive or negative voltage of 2 to 10 kV is applied to the electrode plate A105 for the purpose of providing an electric field between the electrode plate A105 and the electrode plate B106, and a voltage of 0 kV is applied to the electrode plate B106. Is applied by the high voltage power source 107.

  In the above configuration, the charging unit 101 generates an unequal electric field between the discharge electrode 102 and the counter electrode plate 103, and at this time, a very strong electric field is generated in the vicinity of the discharge electrode 102 having a linear shape. For this reason, charged particles slightly contained in the air are accelerated to collide with air molecules, and electrons are separated from the air molecules. The separated electrons are also accelerated and collide with air molecules, and the electrons are separated from the air molecules. The phenomenon where electrons are separated from air molecules by collision with electrons is called ionization. In addition, the phenomenon that a large number of electrons separate from air molecules due to repeated ionization is called electron avalanche, but positive-polarity air ions (positive ions) separated by this avalanche or separated electrons and air molecules Are combined to produce air ions (negative ions) having negative polarity. The air ions having a polarity different from that of the discharge electrode 102 are absorbed by the discharge electrode 102 and returned to the air molecules. Conversely, the air ions having the same polarity receive a force in a direction repelling from the discharge electrode 102 by the electric field, Diffusion moves in the direction of 103. The discharge phenomenon in which the air in the vicinity of the discharge electrode 102 is turned into air ions by causing ionization and electron avalanche in this way is called corona discharge, but air ions having the same polarity as the discharge electrode 102 are made by the corona discharge and diffused and moved. The dust is charged by adhering to the dust passing through the charging unit 101.

  The charged dust is introduced into the dust collecting unit 104 along the flow of air. Here, when a voltage is applied to the electrode plate A105 so as to have the same polarity as the discharge electrode 102, the charged dust is mainly applied to the electrode plate 106 by receiving the force of the electric field generated between the electrode plate A105 and the electrode plate B106. It adheres and is removed, and clean air is blown out from behind the dust collection unit 104.

  Here, Patent Document 1 is characterized in that the dust collecting portion is configured by an electrode plate A105 made of a hygroscopic resin having a volume resistivity of the order of 10 to the 10th to 13th power Ω · cm. In other words, by forming the electrode plate A with a semiconductive hygroscopic resin that conducts electricity slightly, an electric field is provided between the electrode plate A105 and the electrode plate B106, and at the same time, a short circuit with sparks (hereinafter referred to as spark) is prevented. It shows that the dust part 104 becomes possible.

  As described above, the electrode plate A105 is made of a semiconductive material, so that it is possible to prevent sparking while collecting dust. However, as another means applicable to making the electrode plate semiconductive, for example, a patent There is a method as described in Document 2. That is, it is a method in which at least one conductive particle of a solid solution of zinc oxide and aluminum oxide, a solid solution of tin oxide and antimony oxide, or a solid solution of indium oxide and tin oxide is dispersed and contained in the resin. For example, by containing 21 to 25% by volume of titanium oxide coated with a solid solution of tin oxide and antimony oxide in a thermoplastic urethane resin, it has a semi-conductivity having a volume resistivity of 10 6-9 Ω · cm order. A composition is obtained.

Japanese Patent No. 3516725 JP-A-5-88510

  Since the electrode plate described in Patent Document 1 is entirely composed of a hygroscopic resin, there is a problem that it is difficult to obtain sufficient mechanical strength. In addition, it is difficult to control the electrical resistance value to a low value, and there is a problem that it is difficult to obtain a high dust collection performance by reducing the electrical resistance value.

  On the other hand, in the technique of semiconducting the electrode plate described in Patent Document 2, it is possible to freely control the electrical resistance value by changing the content of the conductive material. However, since the conductivity is expressed by contact between the conductive particles, if the resin of the binder component is altered due to the adhesion of oil or the like, the electrical resistance value changes due to the change in the distance between the conductive materials. As a result, there is a problem that high dust collection performance cannot be obtained or sparks may occur.

  The present invention solves such a conventional problem, sufficiently high mechanical strength is obtained, the surface resistivity can be controlled freely, and at the same time the spark is eliminated even if oil adheres. It is an object of the present invention to provide an electrode plate for a dust collecting part capable of obtaining a high dust collecting performance, and to provide a dust collecting device capable of obtaining a high dust collecting performance while eliminating a spark.

  In order to achieve the above object, the electrode plate of the present invention is used in a dust collecting part of an electrostatic precipitator, in which electrode plates are laminated at regular intervals and different voltages are applied alternately for each lamination. In addition, a semiconductive film obtained by crosslinking polyalkylene oxide is provided on an insulating substrate.

  Moreover, the dust collector of this invention is equipped with the dust collecting part which laminates | stacks the said electrode plate and applies a different voltage alternately for every lamination | stacking.

  The electrode plate of the dust collecting portion of the present invention has a sufficiently high mechanical strength, can freely control the surface resistivity, and eliminates sparks even when oil adheres, and at the same time has high dust collecting performance. The effect of obtaining is obtained.

  Moreover, the dust collector of this invention can acquire the effect that a high dust collection performance is acquired simultaneously with eliminating a spark by comprising a dust collection part using the said electrode plate.

The block diagram which shows the cross section of the electrode plate of embodiment of this invention The block diagram which shows the semiconductive film inside of the electrode plate of Example A The block diagram which shows the semiconductive film inside of the electrode plate of Example B The block diagram which shows the semiconductive film inside of the electrode plate of the Example C The block diagram which shows the semiconductive film inside of the electrode plate of Example D Configuration diagram showing the dust collector Configuration diagram showing the same charging unit Configuration diagram showing test equipment in dust collection efficiency measurement The block diagram which shows the conventional dust collector described in patent document 1

  The electrode plate according to claim 1 of the present invention is used in a dust collecting part of an electrostatic precipitator, in which electrode plates are stacked at a predetermined interval, and different voltages are applied alternately for each stack, A semiconductive film having a surface resistivity of the order of 10 7 to 12 Ω / □ obtained by crosslinking polyalkylene oxide is provided on an insulating substrate. The surface resistivity is an electric resistance value obtained from a current flowing when a constant voltage is applied in the surface direction. If the surface resistivity is 10 7 Ω / □ or less, the probability of occurrence of a spark is greatly increased. If the surface resistivity is 10 13 Ω / □ or more, a surface potential is obtained when a voltage is applied to the surface. It is known that it takes a very long time to take 3 minutes or more, and the electric field for eliminating sparks and obtaining high dust collection performance by setting the surface resistivity to 10 7 to 12th power / Ω order. It becomes possible to form.

  Polyalkylene oxide is a kind of polymer and is a polymer resin having an ether bond in the main chain. Examples include polyethylene glycol and polypropylene glycol. Polyalkylene oxide has an ether bond and has a structure in which oxygen atoms and carbon atoms are repetitively arranged with a single bond. Therefore, polarization occurs due to the difference in electronegativity between oxygen atoms and carbon atoms. ing. Therefore, two oxygen atoms sandwiching a carbon atom trap a positive charge, and two carbon atoms sandwiching an oxygen atom trap a negative charge. If an electric field is present at that time, the trapped charge moves along the electric field, and a slight amount of electricity flows.

  Based on such a principle, polyalkylene oxide has a property of moving charges slightly, so-called semiconductivity. By cross-linking polyalkylene oxide with a cross-linking agent to obtain a resin having a higher molecular weight, the surface resistivity is 10 7 to 12th power / square order surface resistivity, and can be easily peeled off or used as a solvent. A strong semiconductive film that does not melt can be obtained. By providing this semiconductive film on an insulating substrate made of an insulating resin or ceramic, an electrode plate having high mechanical strength can be formed. By the way, in order to form an electric field by applying a slight amount of electricity, it is only necessary to give the surface semiconductive, and it is not necessary to give the whole electrode plate semiconductive, so a high-strength insulating substrate is used as a support, By providing a semiconductive film on the surface, it is possible to form an electric field while giving the electrode plate high strength.

  When a voltage is applied to the semiconductive film, a charge corresponding to the voltage is supplied to the surface of the semiconductive film. Therefore, an electric field is formed when the electrode plates are opposed to each other with a certain interval and a different voltage is applied to each. However, since the semiconductive film supplied with electric charges is semiconductive, no spark is generated even when the electrode plates to which different voltages are applied are in contact with each other.

  A specific method for obtaining an electrode plate having a semiconductive film is, as described in claim 2, a method in which an ink obtained by mixing the polyalkylene oxide and a crosslinking agent is applied to an insulating substrate and solidified. Can be mentioned. A liquid polyalkylene oxide dissolved in a solvent and a liquid crosslinking agent solvent dissolved in the solvent are mixed to prepare an ink, which is applied to the insulating substrate before the ink undergoes a crosslinking reaction and is cured. Then, the electrode plate having a semiconductive film on the insulating substrate can be obtained by curing by heating to promote the crosslinking reaction. Here, examples of the crosslinking agent include isocyanates such as xylylene diisocyanate and tolylene diisocyanate. Isocyanate-based cross-linking agents take a certain amount of time for the cross-linking reaction, and many of them do not cause a rapid cross-linking reaction in a short time.

  Here, when the polyalkylene oxide is in a liquid state at room temperature, it is not necessary to dissolve in a solvent and liquefy it, whereby an ink can be prepared more easily. Examples of the polyalkylene oxide that is liquid at room temperature include polyethylene glycol having an average molecular weight of 600 or less.

  Moreover, the polyalkylene oxide contains salts. By adding salts such as sodium chloride, lithium chloride, or electrolytes such as lithium hypochlorite to the polyalkylene oxide by a method such as dissolution, sodium ions, lithium ions, chloride ions or hypochlorous acid can be added to the polyalkylene oxide. Provides electrolytes such as chlorate ions. As a result, the charge of the polyalkylene oxide increases, and as a result, the surface resistivity can be controlled to a low region. For example, with polyalkylene oxide alone, it is difficult to obtain a surface resistivity of 10 10 Ω / □ or less, but by including salts, a surface resistivity of 10 7-10 Ω / □ can be obtained. It becomes possible.

  Moreover, in order to improve the intensity | strength of a semiconductive film, what has OH group and melt | dissolved resin with a molecular weight of 10,000-100,000 in a solvent is contained in the said ink. When a polyalkylene oxide having a relatively low molecular weight of about 600 is crosslinked, depending on the amount of the crosslinking agent, the molecular weight may not be sufficiently increased and a strong film may not be formed. When the amount of the cross-linking agent to be mixed is increased in order to compensate for this, the ratio of the cross-linking agent having low conductivity is increased, so that the surface resistivity is not sufficiently lowered. By incorporating a resin having an OH group and a relatively high molecular weight, such as 10,000 to 100,000, into the crosslinking network in the film, the scale of one molecule forming the bridge can be increased and a stronger film can be obtained. Examples of the resin having an OH group and a molecular weight of 10,000 to 100,000 include acrylic polyol resin, vinyl chloride / vinyl acetate copolymer resin, and polyester resin. Vinyl chloride / vinyl acetate copolymer resin and polyester resin have OH groups remaining in the unpolymerized reaction portion during production. The resin and the polyalkylene oxide are linearly cross-linked by a cross-linking agent, or the cross-linking unit of the resin and the resin forming a cross-linking network is enlarged by cross-linking so that the polyalkylene oxide hangs on these resins. And the film can be strengthened.

Further, in order to obtain a sufficiently low surface resistivity, conductive particles made of a metal oxide are included in the ink. Examples of conductive particles made of metal oxide include tin oxide (hereinafter referred to as ATO) particles doped with antimony and titanium oxide (hereinafter referred to as TiO ₂ ) particles impregnated with ATO particles as described in claims 7 and 8. ATO particles are a solid solution of tin oxide and antimony oxide, and one electron is left in the unit crystal. The conductivity is obtained by moving the electrons through the crystal. Since there is one electron that can move in the unit crystal, it is easy to control the value of the electrical resistance of the composite by changing the content when it is combined with the resin. For example, since metal, carbon particles, and the like have a large number of movable electrons, it is difficult to control the value of electrical resistance. For example, when the content is higher than a certain content, the conductivity rapidly increases.

In addition, TiO ₂ particles impregnated with ATO particles can be used by utilizing the fact that conductivity is obtained as long as the ATO particles are in contact with each other. Conductivity can be obtained by contacting particles in which ATO particles having a central particle diameter of 20 nm are attached to TiO ₂ particles having a central diameter of 200 nm, and the amount of expensive ATO particles can be reduced. Here, the ATO particles are brought into contact with each other through the polyalkylene oxide, and the ATO particles are electrically connected to each other by the polyalkylene oxide that slightly conducts electricity. Therefore, even if the oil adheres and the resin does not return to expand and the distance between the ATO particles increases, the electric resistance does not increase due to the intervening polyalkylene oxide, and a constant value is maintained. Can continue to form.

  Further, the ink is printed on the insulating substrate by a screen printing method. An emulsifier is applied to a mesh plate knitted with polyester yarn or stainless steel yarn to harden it, and a film on which an arbitrary pattern shape is drawn is layered and exposed to ultraviolet rays. And the screen board is created by dissolving the part of the shape which hits ultraviolet rays with a dissolving agent. The screen printing method is a method in which a screen plate is applied to an insulating substrate, ink is placed on the screen plate, and the ink is printed on the insulating substrate by extruding the ink using a squeegee. If the screen printing method is used, the ink can be printed on the insulating substrate with a uniform thickness, and high-definition printing can be performed with an arbitrary pattern shape.

  Further, the insulating substrate is a resin plate in which a resin material is filled with glass fibers and mica and extruded and subjected to a heat press. As will be described later, in order to form a dust collecting part of the dust collector by opening the space and stacking the electrode plates, the electrode plates do not need to be greatly bent and do not have a large warp from the beginning. . That is, the electrode plate itself needs to have high strength and flatness. Resin material is filled with short glass fibers and mica, extruded and then heated and laminated and crystallized by crystallization to obtain a resin plate having high strength and high flatness. By using the resin plate as an electrode plate, an electrode is obtained. It becomes possible to suppress bending and warping of the plate.

  Moreover, the dust collector of Claim 10 of this invention is a dust collector which laminates | stacks the said electrode plate in any one of Claims 1 thru | or 10 at fixed intervals, and applies a different voltage alternately for every lamination | stacking. It is characterized by providing a part. By laminating electrode plates having a surface resistivity of the order of 10 7 to 12 Ω / □ at regular intervals, and applying different voltages alternately for each layer, no electric spark is generated while forming an electric field. The dust part can be configured. By introducing the dust charged by the upstream charging unit into the downstream dust collecting unit, the dust can be collected.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Incidentally, these embodiments are merely examples, and the present invention is not limited to these embodiments.

(Embodiment)
A sectional view of an electrode plate 1 in which a semiconductive film 3 is provided on an insulating substrate 2 is shown in FIG. The insulating substrate 2 is a composite sheet obtained by mixing a pellet formed by mixing polyethylene terephthalate resin, glass fiber, and mica, and extruding it into a sheet shape while heating and pressing to crystallize it. It has higher strength and flatness than the plate. In addition, since all the constituent materials have insulating properties, the insulating substrate has high insulating properties. A semiconductive film 3 is provided on the front and back surfaces of the insulating substrate 2. As shown in FIG. 2, the semiconductive film 3 is obtained by a crosslinking reaction between a polyalkylene oxide 4 and a crosslinking agent 5 having an isocyanate group such as xylylene diisocyanate. That is, it is obtained in the form of a crosslinked polyalkylene oxide 6. Further, as shown in FIG. 3, the strength of the semiconductive film 3 can be increased by adding an acrylic polyol resin 7 having an average molecular weight of 30,000 which reinforces the crosslinked network of the resin. Also, as shown in FIG. 4, the surface resistivity can be freely controlled by adding and mixing conductive ATO-attached TiO ₂ particles 8. Here, an electrode plate 1 having several types of semiconductive films 3 shown below was created by preparing and printing ink, and surface resistivity and solubility in water-soluble oil were evaluated. In producing the electrode plate 1, the above-described composite sheet was used as the insulating substrate 2. Further, as the polyalkylene oxide 4 used in the ink, liquid polyethylene glycol having an average molecular weight of 600 was used. As the cross-linking agent solution, an ethyl acetate solution containing about 70% of methylol xylylene diisocyanate was used, and was finally mixed during ink preparation. Moreover, the crosslinking conditions of the semiconductive film 3 are that the polyalkylene oxide 4 and other additives are added and the crosslinking agent 5 is mixed, then left standing for 30 minutes, printed, and heated at 100 ° C. for 20 minutes. The method was unified. Further, a screen printing method is used as a method for providing the semiconductive film 3 on the insulating substrate 2, and a screen plate making having 250 holes per inch is used to form the semiconductive film 3 on the surface of the insulating substrate 2. The resulting ink was printed. The thickness of the semiconductive film 3 after crosslinking was 5 to 10 μm.

<Example A>
An electrode plate 1 was prepared by preparing an ink in which 10 g of polyalkylene oxide 4 and 10 g of a crosslinking agent 5 solution were mixed, and obtaining a semiconductive film 3 which was printed on the insulating substrate 2 and crosslinked. The internal structure of the semiconductive film 3 of Example A is shown in FIG. As shown in FIG. 2, the polyalkylene oxide 4 having a long molecular chain is cross-linked by the cross-linking agent 5 to be polymerized, and the network scale of the resin formed by the cross-linking is increased.

<Example B>
An ink was prepared by mixing 10 g of polyalkylene oxide 4 and 2 g of a cyclohexanone solution containing 40% of an acrylic polyol resin 7 having an average molecular weight of about 30,000, and then mixing 10 g of the crosslinking agent 5 solution. The electrode plate 1 was created by printing the created ink on the insulating substrate 2 to obtain a crosslinked semiconductive film 3. The internal structure of the semiconductive film 3 of Example B is shown in FIG. As shown in FIG. 3, the polyalkylene oxide 4 having an average molecular weight of 600 and the acrylic polyol resin 7 having an average molecular weight of about 30,000 are cross-linked by the cross-linking agent 5 to form a polymer, and the network scale of the resin formed by the cross-linking is large. It is bigger.

<Example C>
10 g of polyalkylene oxide 4 and 2 g of cyclohexanone solution containing 40% of acrylic polyol resin 7 were mixed, and then 10 g of ATO-added TiO ₂ particles 8 were mixed. Thereafter, 10 g of a crosslinking agent 5 solution was mixed to prepare an ink. The electrode plate 1 was created by printing the created ink on the insulating substrate 2 to obtain a crosslinked semiconductive film 3. The internal configuration of the semiconductive film 3 of Example C is shown in FIG. As shown in FIG. 4, the polyalkylene oxide 4 having an average molecular weight of 600 and the acrylic polyol resin 7 having an average molecular weight of about 30,000 are cross-linked by the cross-linking agent 5 to form a polymer, and the network scale of the resin formed by the cross-linking is large. It is bigger. The conductive ATO-added TiO ₂ particles 8 are uniformly dispersed therein, and the polyalkylene oxide 4 is present between the ATO-added TiO ₂ particles 8.

<Example D>
10 g of polyalkylene oxide 4 in which 10% by weight of lithium hypochlorite was dissolved and 2 g of cyclohexanone solution containing 40% of acrylic polyol resin 7 were mixed, and then 10 g of the crosslinking agent 5 solution was mixed to prepare an ink. . The electrode plate 1 was created by printing the created ink on the insulating substrate 2 to obtain a crosslinked semiconductive film 3. The internal configuration of the semiconductive film 3 of Example C is shown in FIG. As shown in FIG. 5, the polyalkylene oxide 4 having an average molecular weight of 600 and the acrylic polyol resin 7 having an average molecular weight of about 30,000 are cross-linked by the cross-linking agent 5 to form a polymer, and the network scale of the resin formed by the cross-linking is large. It is bigger. Lithium ions 9 and hypochlorite ions 10 are present in the polyalkylene oxide and function as charges that move through the polyalkylene oxide. Therefore, the conductivity of the polyalkylene oxide is increased, and the surface resistivity of the semiconductive film 3 can be further reduced.

<Comparative Example E>
An ink was prepared by mixing 10 g of polyalkylene oxide 4 and 5 g of the crosslinking agent 5 solution. The electrode plate 1 was created by printing the created ink on the insulating substrate 2 to obtain a crosslinked semiconductive film 3.

<Comparative Example F>
12 g of ATO-attached TiO ₂ particles 8 were added to 10 g of a cyclohexanone solution containing 40% of acrylic polyol resin 7 and mixed. Thereafter, 1.8 g of a crosslinking agent 5 solution was mixed to prepare an ink. The electrode plate 1 was created by printing the created ink on the insulating substrate 2 to obtain a crosslinked semiconductive film 3.

  Table 1 shows the results of the surface resistivity, the surface resistivity after the water-soluble oil coating test, and the weight change rate of the semiconductive film 3 obtained in the trial production. Here, the surface resistivity is a value in an environment of 25 ° C. and 60%. The water-soluble oil application test is a test in which water-soluble oil is applied and the water-soluble oil is washed away with water after being left for 10 minutes in an environment of 80 ° C., and the durability against water-soluble oil is evaluated at an accelerated rate. It has become. The weight change rate of the semiconductive film 3 is a weight change rate calculated by “weight change of the semiconductive film 3 / original weight of the semiconductive film 3”. By the way, water-soluble oil is a water-soluble oil composed of about 40% mineral oil, about 30% synthetic esters, about 10% additives such as lubricants, and about 5% ether surfactants. Has the property of

As can be seen from Table 1, all of the electrode plates 1 of Examples A, B, C, and D have a log (surface resistivity) that is a common logarithm of surface resistivity of 7 or more and less than 13, that is, a desired value. It has a surface resistivity of 10 7 to 12th power / square order. Further, even after the water-soluble oil application test, the surface resistivity is maintained on the order of 10 7 to 12th power / square, and the weight is not significantly changed. In addition, in the electrode plates of Examples C and D, a surface resistivity of the order of 10 9 Ω / □ was obtained, and lithium ions 9 and hypoxia obtained by ATO-added TiO ₂ particles 8 and lithium hypochlorite. The conductivity improvement effect by addition of chlorate ion 10 was confirmed.

In the electrode plate 1 of Comparative Example E, the semiconductive film 3 has undergone a 47% weight change in the water-soluble oil application test, and the weight is greatly reduced. This indicates that the film is dissolved by water-soluble oil, and indicates that if the amount of the crosslinking agent 5 is insufficient, the film is dissolved because the network scale of the resin formed by crosslinking is small. Further, in the electrode plate 1 of Comparative Example F, Log (surface resistivity) = 8.5, and the film is not dissolved by the water-soluble oil. However, the surface resistivity is greatly increased by the water-soluble oil application test. This is because the water-soluble oil enters the network of the resin in the semiconductive film 3 by applying and heating the water-soluble oil and expands or dissolves the resin, thereby increasing the distance between the ATO-attached TiO ₂ particles 8, or This means that a gap is created between the ATO-attached TiO ₂ particles 8. As in Example C, the surface resistivity can be freely controlled by electrically connecting the ATO-attached TiO ₂ particles 8 with the polyalkylene oxide 4 that conducts a slight amount of electricity. It was found that it was possible to obtain high dust collection performance.

Next, as shown in FIG. 6, the electrode plates 1 of Example C are alternately stacked as an electrode plate A12 and an electrode plate B13, and a high voltage is applied to the electrode plate A12 and a voltage of 0 kV is applied to the electrode plate B13. The dust part 11 was created. A charging unit 14 including a discharge electrode 15 to which a high voltage is applied as shown in FIG. 6 and a counter electrode plate 16 to which 0 kV is applied is installed on the upstream side of the dust collecting unit 11 to form a dust collecting device. The dust collection efficiency of the dust collector was measured. At that time, as shown in FIG. 8, a blower 18 is provided on the downstream side of the dust collector so that air flows in the dust collector as indicated by the ventilation direction 17. Further, a high voltage is applied to the charging unit 14 and the dust collecting unit 11 by the high voltage power source 19. The dust collection efficiency was calculated according to the following equation by measuring the number concentration of dust particles having a particle diameter of 0.3 μm or more contained in the atmosphere on the upstream side and downstream side of the dust collector.
Dust collection efficiency = (1−Dust number concentration on the outlet side / Dust number concentration on the upstream side) × 100%
The distance between the electrode plate A12 and the electrode plate B13 of the dust collecting unit 11 is 5 mm, the dimensions of the electrode plate A12 and the electrode plate B13 of the dust collecting unit 11 in the ventilation direction 17 are 250 mm, and the charging unit 14 and the dust collecting unit 11 are applied. The voltage is −5.2 kV, the discharge current flowing through the charging unit 14 is 150 μA, the wind speed with respect to the opening area is 3 m / s, and the above conditions are given to the dust collector and the dust collection efficiency measurement. As a result of measurement under the above conditions, a dust collection efficiency of 90% was obtained. Moreover, although it continued for 7 days, the spark in the dust collection part 11 did not generate | occur | produce once. In addition, when the same dust collector was assembled and tested by changing the electrode plate A12 and the electrode plate B13 of the dust collecting portion 11 to an aluminum metal plate, 91% dust collection efficiency was obtained, but it was operated for several hours. Later, a spark occurred in the dust collecting section 11. Thus, it turned out that the dust collector provided with the dust collection part 11 produced using the electrode plate 1 of this invention can obtain high dust collection efficiency simultaneously with eliminating a spark.

  The electrode plate and the dust collector according to the present invention are high in strength, and can obtain high dust collection performance even when oil adheres, and at the same time, can eliminate the sparks of the dust collection portion. It is useful as a dust collector that is installed in dust collectors that require dust collection performance and safety, and a simple structure at the same time, such as factory oil mist dust collectors, home air cleaners, or air supply type exhaust fans. is there.

DESCRIPTION OF SYMBOLS 1 Electrode plate 2 Insulating substrate 3 Semiconductive film 4 Polyalkylene oxide 5 Crosslinker 6 Crosslinked polyalkylene oxide 7 Acrylic polyol resin 8 ATO-added TiO ₂ particle 9 Lithium ion 10 Hypochlorite ion 11 Dust collector 12 Electrode Board A
13 Electrode plate B
DESCRIPTION OF SYMBOLS 14 Charging part 15 Discharge electrode 16 Counter electrode plate 17 Ventilation direction 18 Blower 19 High voltage power supply

Claims (11)

An electrode plate used for a dust collecting part of an electric dust collector, wherein electrode plates are stacked at a predetermined interval and a different voltage is applied to each of the stacked electrode plates. An electrode plate comprising a semiconductive film having a surface resistivity of 10 7 to the 12th power Ω / □ order. The electrode plate according to claim 1, wherein a semiconductive film is obtained by applying an ink mixed with the polyalkylene oxide and a crosslinking agent to the insulating substrate and solidifying it. 3. The electrode plate according to claim 1, wherein the polyalkylene oxide is liquid at normal temperature. 4. The electrode plate according to claim 1, wherein the polyalkylene oxide contains a salt. 5. The electrode plate according to claim 1, wherein the ink contains a resin having an OH group and a molecular weight of 10,000 to 100,000 dissolved in a solvent. The electrode plate according to any one of claims 1 to 5, wherein the ink includes conductive particles made of a metal oxide. The electrode plate according to claim 6, wherein the conductive particles are tin oxide doped with antimony. 7. The electrode plate according to claim 6, wherein the conductive particles are titanium oxide doped with tin oxide doped with antimony. The electrode plate according to claim 1, wherein the ink is printed on the insulating substrate by a screen printing method. The electrode plate according to any one of claims 1 to 9, wherein the insulating substrate is a resin plate obtained by filling a resin material with glass fibers and mica and performing extrusion pressing after extrusion molding. An electrostatic precipitator, comprising: a dust collector that stacks the electrode plates according to any one of claims 1 to 10 at regular intervals and applies different voltages alternately for each stack.

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