JP3346926B2 - Electrical insulating material and dust collecting electrode using the same for air purifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric insulating material suitable for use as a dust collecting electrode of an air purifier, and a dust collecting electrode for an air purifier using the electric insulating material.

[0002]

2. Description of the Related Art Conventionally, this type of air purifier has been used for household use as a single unit or as an air conditioner built-in type, or for business such as conference rooms, offices, hospitals, pachinko parlors, mahjong villas, and karaoke boxes. Or a passenger car,
It is well known that it is used for various purposes such as mounting on vehicles such as railway vehicles.

[0003] By the way, as a dust collecting system of this air purifier, there are a filter type, an electrostatic filter type, an electric type, etc., but the filter type has poor dust collecting performance, and the electrostatic filter type has low dust collecting efficiency. In addition, there are performance problems such as the inability to remove cigarette smoke.

On the other hand, electric dust collectors have high dust collection efficiency, are capable of collecting cigarette smoke and have high performance, and have features such as high output and compactness as dust collectors. High demand is expected. The dust collecting mechanism of the electric dust collector is schematically described with reference to FIG. 6. When the air containing dust passes through the ionization section (ionizer section) by driving the blower fan, the dust contained in the air becomes one side. Polarity (positive polarity on this side)
Is charged (ionized), and sent to the dust collecting unit (dust collecting unit).

In this dust collecting unit, as shown in FIG. 7, a positive electrode plate connected to a positive electrode and a negative electrode plate connected to a negative electrode are alternately arranged. The side electrode plate is grounded (grounded) and a high voltage (for example, 2000 V) is applied to the positive side electrode plate to generate an electric field between the two electrode plates, and ionized dust is removed from one of the electrode plates (in this example, (Negative electrode plate) to collect.

In such an electric dust collector having a dust collecting mechanism, the positive electrode plate of the above-mentioned dust collecting unit is coated with an insulating material to prevent an accident due to an electric short circuit. There are several known structures of the electric insulating material. One of them is, for example, a "mold type" as shown in FIG.
It is known that an aluminum (Al) electrode material is extruded so as to be covered with an insulating material of polyvinyl chloride resin (PVC) via an adhesive layer.

[0007] Further, since the PVC resin has inferior withstand voltage characteristics, a polypropylene resin (P
It is also known that an aluminum electrode material is coated with the insulating material of P) to thereby improve withstand voltage characteristics. Among PP resins, PP resin has extremely high insulation properties (having a life several hundred times longer than that of PVC resin), and is excellent in arc resistance, track resistance and the like.

[0008] By changing to a PP material having excellent withstand voltage characteristics, an aluminum electrode can be laminated with the PP insulating film to reduce the thickness, whereby the electric insulating material can be used as a dust collecting electrode of an air purifier. When used, the pressure loss when dust passes between the electrodes can be reduced. Further, since the distance between the electrodes can be made narrower, dust collection efficiency can be improved, and furthermore, there are advantages such as higher performance and compactness.

[0009]

However, the operating environment of the air purifier is various, and there is an atmosphere where cigarette smoke is intense, as well as an atmosphere of high temperature or high humidity. It has been found that the dust collection efficiency greatly changes depending on the use environment. Under such circumstances, for example, the above-mentioned PVC mold type electrode insulating material usually contains a plasticizer such as dioctyl phthalate (DOP) for improving the extrudability. The change causes bleeding out of the PVC resin material, which causes a temporal deterioration phenomenon as an insulating material.
In addition, there is a problem that the electrical characteristics of the insulator change depending on the use environment, the surface potential as an electrode material decreases, and the dust collection efficiency deteriorates.

On the other hand, the PP laminate type electrode insulating material has good withstand voltage characteristics, but has a large surface potential reduction rate in any of smoke, high-temperature, and high-humidity atmospheres. There has been a problem that the dust collection efficiency decreases over time. The inventors of the present invention have conducted various tests, and as a result, when the volume resistance of the insulating resin film is high, the charge applied to the electrodes does not appear on the surface, and the reduction of the surface potential lowers the dust collection efficiency. If the volume resistance value of the insulating resin film is low, the surface resistance is low, and charges (in this example, positive (+) charges) leak, and it is thought that the dust collection efficiency also decreases due to a decrease in surface potential. Was.

The present invention has been made in view of such a point, and an object of the present invention is to provide an electric insulating material which can obtain high dust collection efficiency even in various use environments. In particular, by controlling the volume resistance value of the insulating resin film within a certain range, the surface potential as an electrical insulating material is stabilized, and thereby high dust collection efficiency can be maintained for a long time. .

[0012]

SUMMARY OF THE INVENTION The present invention in order to achieve this object, an electrical insulating material the conductive material is coated by insulation resin film through an adhesive, the volume of the insulating resin film Resistance value is 3.0 × 10 ^{11 to} 9.0 ×
The gist is that it is in the range of 10 ¹⁵ Ω · cm. When the volume resistivity is in this range, the rate of decrease in surface potential is small (less than 5%), and high dust collection efficiency is continuously maintained. This volume resistance value is further 3.0 × 10 ¹² to
Within the range of 4.0 × 10 ¹⁴ Ω · cm, the reduction rate of the surface potential can be further reduced (less than 2.5%).

In this case, various materials for the insulating resin film can be considered, and examples thereof include a polyvinyl chloride (PVC) resin material and a polypropylene (PP) resin material which have been conventionally used. And PVC
In the case of a system resin material, the volume resistivity can be controlled in the above range by blending 8 to 20% by weight of an ethylene vinyl acetate copolymer. In this case, if talc is further added, the destructive characteristics of the insulating resin film are suppressed, and the insulating property is maintained for a long time. When polymethyl methacrylate (PMMA) is blended, desired rigidity can be imparted to the insulating resin film, and durability is improved.

On the other hand, in the case of a polypropylene (PP) -based resin material, a change in the volume resistance with time is small by incorporating a modified polypropylene (modified PP), an antistatic agent, a conductive filler, or a polymer having a low volume resistance. In addition, it is possible to present an electric insulating material controlled in a certain range. The rate of decrease in the surface potential of the electrical insulating material is also small, and the dust collection efficiency as a dust collection electrode can be continuously maintained.

An adhesive is interposed between the conductive material and the insulating resin film. The adhesive is a flame-retardant adhesive such as a maleic anhydride-modified polypropylene resin adhesive and bromine (Br). ) A mixture containing a system flame retardant and a flame retardant auxiliary is preferred. By using this flame-retardant adhesive for lamination (lamination) of an insulating resin film, it is possible to effectively prevent a fire or the like caused by the occurrence of a spark or the like.

As the conductive material, an aluminum (Al) thin plate material or a foil material is generally used, but it is not necessarily limited to this. A conductive paint is printed on an insulating resin film, and an adhesive is May also be bonded together with an insulating resin film via the same.

When such an electrical insulating material is used for a dust collecting electrode of an air purifier, the volume resistance of the insulating resin film is controlled within a certain range, so that various kinds of atmospheres such as smoke atmosphere, high temperature or high humidity atmosphere can be obtained. In a use environment, the rate of decrease in surface potential is small, high dust collection efficiency can be obtained forever, and permanent use can be achieved. In the case of a laminate type, the interval between the insulating electrodes can be made narrower than the thinning of the insulating electrodes, whereby the dust collection efficiency is further improved, and higher performance and compactness are expected. .

[0018]

EXAMPLES Various experiments have been conducted on the present invention, and the details thereof will be described below. First, experimental results when an insulating film made of a polyvinyl chloride (PVC) resin material is used will be described. Table 1 below summarizes the results.

[0019]

[Table 1]

In Table 1, the products of the present invention are shown in Examples 1 to 3.
Examples up to Example 5 are shown, and two examples (Comparative Examples 1 and 2) are shown as comparative products. The sectional forms of the product of the present invention (Examples 1 to 5) and the comparative products (Comparative Examples 1 and 2) are as shown in Table 2 below.

[0021]

[Table 2]

Examples 1 to 5 of the product of the present invention and Comparative Example 2 of the comparative product all use a PVC-based insulating resin film, and an aluminum (Al) foil having a thickness of 50 μm is used as an internal electrode. And a thickness of 30 on both sides of this internal electrode.
A 0 μm PVC resin film is bonded (laminated) via an adhesive. The adhesive uses a conventionally generally known ethylene ethyl acrylate copolymer,
The thickness of the adhesive layer is 50 μm on one side, and the total thickness of the electrical insulating material is 750 μm.

Examples 1 to 5 and Comparative Example 2
The composition of the PVC-based insulating film used in Example 1 is as shown in Table 1, and the PVC resin as a base material is "103EP-8" manufactured by Zeon Corporation.

In Examples 1 to 5 of the present invention, a PVC resin graft-polymerized with an ethylene vinyl acetate (EVA) copolymer (trade name "Graftmer R-5" manufactured by Zeon Corporation) is used. Is blended. As shown in Table 1, the compounding amount was set in five steps such that the amount was the smallest in Example 1 and the compounding amount was increased stepwise and the case in Example 5 was largest. I have. In addition, each of these test samples is mixed with a predetermined amount of talc (trade name “Mistron Vapor Talc” manufactured by Nippon Mistron Co., Ltd.) in order to suppress the dielectric breakdown of the PVC resin film. Polymethyl methacrylate (PMMA)
(Sumitomo Chemical Co., Ltd. product name "SUMIPEX LG-6
A), and stabilizers / lubricants (trade names “ADK STAB AC-186” and “ADK STAB RUP-103” manufactured by Asahi Denka Kogyo KK). The mixing ratio of the above-mentioned EVA copolymer is as shown in Table 1, and is in the range of 8% by weight (Example 1) to 20% by weight (Example 5).

Comparative Example 2 shows that, although PVC resin was mixed with dioctyl phthalate (DOP) as a plasticizer, EV
A test sample containing no A copolymer is provided. The fact that talc, PMMA and a stabilizer / lubricant are blended is the same as in Examples 1 to 5, and there is no difference in this point.

On the other hand, Comparative Example 1 was described later, but as shown in Table 2, a polypropylene (PP) resin film was used, and a 50 μm thick aluminum internal electrode was placed 150 μm thick from both sides. Are laminated with an adhesive between the PP resin films. Here, a flame-retardant adhesive is used, and in this case, maleic anhydride-modified polypropylene (trade name “Admer QF-551” manufactured by Mitsui Petrochemical Industries, Ltd.) is used. The thickness of the adhesive layer is 100 μm on one side, and thus the total thickness of the electrical insulating material using the PP-based insulating film is 550 μm.

Next, returning to Table 1, the test methods of the various measurement tests shown in Table 1 will be described in order. The reduction rate of the surface potential shown in Table 1 was measured as follows. First, a test sample is prepared by bonding (laminating) an aluminum foil, which is a conductive material, with various types of insulating resin films using an adhesive, and the sample is shown in FIGS. As shown in b), an aluminum foil is stripped off at one end and cut to a length of about 15 cm. The lamination conditions were a rubber roll temperature of 160 ° C., a linear velocity of 1.0 m / min, and a linear pressure of 3.0 kgf / cm.

On the other hand, a surface potential measuring device as shown in FIG. 2 was assembled, a sample was inserted between two aluminum foils (working as a cathode plate) connected to the ground, and the ends exposed from the sample were exposed. Connect the aluminum foil to the power supply. Then, the probe of the surface electrometer is brought close to the position between the aluminum foil as the cathode plate and the sample. Then, the environment of the sample portion changes according to the measurement conditions. That is, 2
In a 5 ° C. × smoke atmosphere, place the sample portion in a box and cook incense sticks. In addition, 32 ° C x 8 which is high humidity condition
0% RH (relative humidity) and high temperature condition of 50 ° C
The measurement under the condition of × 50% RH is performed by placing the sample in a thermo-hygrostat.

For the measurement, first, only the surface voltmeter is turned on, and the value of the initial charge is measured. Next, a voltage of 2 KV is applied, and then a change with time of one hour is confirmed. After one hour, the voltage of 2 KV is stopped, and it is confirmed whether the voltage returns to the initial charge value. The results of these measurements are as shown in Table 1. The mark ◎ indicates that the rate of decrease in surface potential was 2.5% or less, and the mark 極 め て indicates that the rate of decrease in surface potential was in the range of 2.5 to 5%. The mark “x” indicates that the rate of decrease in the surface potential exceeded 5%, indicating that the sheet was defective.

The measurement of the volume resistance value is performed according to JIS C 2
318 was performed according to the measurement method. That is, samples of various types of insulating resin films are cut into a size of 10 cm × 10 cm and placed on the electrode section of the measuring machine. Then, place the electrode part in a thermo-hygrostat, and mix the sample according to the measurement conditions.
Leave for about 0 minutes. Next, an applied voltage of 500 V is applied and the resistance value after 5 minutes is read. The final resistance value is calculated by measuring the thickness (cm) of the insulating resin film and applying the measured value to the following formula.

[0031]

These measurements were taken at 25 ° C. × smoke atmosphere,
The test was performed under the conditions of 32 ° C. × 80% RH and 50 ° C. × 50% RH. The measured values are also shown in Table 1. Next, the results of these measurement tests will be discussed. At first, Comparative Example 1 among the comparative products was 25 ° C. × smoke atmosphere, high humidity 3
2 ℃ × 80% RH atmosphere and high temperature 50 ℃ × 50%
Under any condition of the RH atmosphere, the volume resistance value was extremely high. Further, although a correlation with this volume resistance value is observed, the rate of decrease in the surface potential is extremely large, and it was determined to be defective (x mark) under any conditions.

In Comparative Example 2, the decrease rate of the surface potential was not so large in a 25 ° C. × smoke atmosphere and a high humidity environment of 32 ° C. × 80% RH, but it was 50 ° C. × 50% RH.
In the high temperature atmosphere, the rate of decrease in the surface potential was large, and the sample was determined to be defective (x mark).

On the other hand, in the case of the product of the present invention,
Table 1 shows the measurement results of the volume resistance value and the decrease rate of the surface potential of Example 5, and as is clear from Table 1, 25 ° C. × smoke atmosphere, high humidity and 32 ° C. × 80. % R
Under both the H atmosphere and the high temperature conditions of 50 ° C. × 50% RH, the reduction rate of the surface potential was relatively small, and good results (（or 印) were obtained.

FIG. 3 is a graph showing the correlation between the volume resistance value and the determination of the surface potential change rate. As shown in FIG. 3, 25 ° C. × smoke atmosphere, 32 ° C. × 80
% RH in a high humidity environment of 50% RH and a high temperature atmosphere of 50 ° C x 50% RH.
If it exceeds 0 × 10 ¹⁵ Ω · cm, the decrease rate of the surface potential is 5
% Or more, and is determined to be defective (marked with x). Conversely, if the volume resistivity falls below 3.0 × 10 ¹¹ Ω · cm, the rate of decrease in the surface potential also increases to 5% or more,
It is determined to be defective (x mark). This is because, when the volume resistance is too high, the positive (+) charge is not supplied to the insulating film and the negative (−) charge is accumulated, and the surface potential decreases. When the surface resistance is low, it is estimated that the positive (+) charge leaks because the surface resistance is low, and the surface potential decreases.

From the graph of FIG. 3, the range of the volume resistance value for obtaining the most appropriate range (decision 最 も) where the rate of decrease in the surface potential is less than 2.5% is from 3.0 × 10 ¹² to 4. .0x
It was found to be 10 ¹⁴ Ω · cm. Within this range, the reduction rate of the surface potential is 2.5% in any of a 25 ° C. × smoke atmosphere, a high humidity atmosphere of 32 ° C. × 80% RH, or a high temperature atmosphere of 50 ° C. × 50% RH. And the dust collection efficiency can be maintained for a long time.

Next, FIG. 4 is a graph showing the relationship between the amount of ethylene vinyl acetate (EVA) copolymer and the volume resistance value blended in the PVC insulating resin films shown in Examples 1 to 5 described above. It is a thing. Atmosphere conditions are 2
In the case of 5 ° C. × smoke atmosphere, the abscissa indicates the amount of the EVA copolymer and the ordinate indicates the volume resistance. As can be seen from this figure, EV is required to reduce the surface potential reduction rate to less than 5%.
It is desirable that the blending amount of the A copolymer is in the range of 8 to 20% by weight, and the blending amount of the EVA copolymer is 10 to 18 in order to further reduce the reduction rate of the surface potential to less than 2.5%. It became clear that it was good to set it in the range of weight%.

In the case of such an electric insulating material using a PVC-based insulating resin film, the PVC resin contains 8 to 20% by weight, preferably 10 to 18% by weight of the EVA copolymer.
By giving a dividend (in this embodiment, compounding in the form of an EVA graft polymerized PVC polymer), the volume resistivity of the insulating film is in the range of 3.0 × 10 ^{11 to} 9.0 × 10 ¹⁵ Ω · cm, preferably 3.0 × 10 ¹⁵ Ω · cm. 0 × 10 ^{12 to} 4.0 × 10 ¹⁴ Ω · cm
Control within the range. The reduction rate of the surface potential is suppressed to less than 5% in any of a 25 ° C. × smoke atmosphere, a high humidity atmosphere of 32 ° C. × 80% RH, or a high temperature atmosphere of 50 ° C. × 50% RH, which is more preferable. Is one that can suppress the rate of decrease in surface potential to less than 2.5%. As a result, dust collection efficiency can be maintained for a long time in various usage environments such as an atmosphere where cigarette smoke is intense and a high temperature and high humidity atmosphere.

Next, a description will be given of experimental results when an insulating film made of a polypropylene (PP) resin material is used. Table 3 below summarizes the results.

[0040]

[Table 3]

In Table 3, the products of the present invention are shown in Examples 6 to
Examples up to Example 9 are shown, and one comparative example is shown. The cross-sectional form of each test sample is as shown in Table 3,
All are 50μm thick aluminum (Al) as internal electrode
An insulating film having a thickness of 150 μm is laminated on both sides of the foil with an adhesive. In each of the test samples, the thickness of the adhesive layer was 100 μm on one side, and the total thickness as an electrical insulating material was 550 μm.

The insulating films of Examples 6 to 9 and the insulating film of Comparative Example 3 of the product of the present invention have different material compositions (blendings) even if they are the same PP resin. First, in Example 6 of the product of the present invention, a maleic acid-modified polypropylene (modified PP) polymer was blended with a polypropylene (PP) polymer in a ratio of 50:50. Both PP polymer and modified PP polymer are manufactured by Mitsui Petrochemical Industries, Ltd.
The trade name of the polymer is “Hypol F-401”, modified P
The trade name of P-Polymer is “Admer QF-551”.

Next, in Example 7, the above-mentioned PP polymer 10 was used.
10 parts by weight of the antistatic agent is added to 0 parts by weight. As the antistatic agent, "Chemistat" (trade name, manufactured by Sanyo Chemical Industry Co., Ltd.) is used.

In Example 8, 56 parts by weight of the conductive filler was blended with 100 parts by weight of the above-mentioned PP polymer.
As the conductive filler, a product name “conductive zinc oxide 23-K” manufactured by Hakusui Chemical Co., Ltd. is used.

In Example 9, 70 parts by weight of a polymer having low volume resistance was blended with 30 parts by weight of the PP polymer. Examples of the polymer having a low volume resistance include a maleic anhydride-modified ethylene ethyl acrylate (EEA) -based material (trade name "AR-" manufactured by DuPont-Mitsui Polychemicals, Inc.).
201 ").

On the other hand, in Comparative Example 3, the above PP polymer 10
It is a 0% PP resin film. As for the adhesive, in all of Examples 1 to 4 of the present invention, a flame-retardant adhesive is used, and in Comparative Example 1, a non-flame-retardant adhesive is used. As the flame-retardant adhesive, a mixture in which 100% by weight of a maleic anhydride-modified polypropylene and 100% by weight of a bromine (Br) -based flame retardant and 30% by weight of a flame retardant auxiliary are used, respectively. Maleic anhydride-modified polypropylene is available from Mitsui Petrochemical Industries, Ltd. under the trade name "Admer QF-55".
1 ", and the Br-based flame retardant is trade name" AF "manufactured by Asahi Glass Co., Ltd.
R-1021 ", and the flame retardant aid is a trade name of" antimony trioxide special grade "manufactured by Sumitomo Metal Mining Co., Ltd. The non-flame retardant adhesive is a maleic anhydride-modified polypropylene 100%.

Returning to Table 3, the results of various measurement tests will now be considered. The method of measuring the rate of decrease in the surface potential and the method of measuring the volume resistance value are the same as those in the case of using the above-mentioned PVC resin-based insulating film, and thus the repeated description is omitted.

Therefore, in the measurement result of the rate of decrease in the surface potential,
The test sample of Comparative Example 1 was 25 ° C. × smoke atmosphere, 32 ° C. ×
In both the 80% RH high humidity atmosphere and the 50 ° C. × 50% RH high temperature atmosphere, the reduction rate of the surface potential was extremely large, and it was judged as unacceptable (x mark). In the case of Comparative Example 1, it can be seen that the volume resistance value of the insulating film is higher under any atmosphere as compared with Examples 1 to 4 of the present invention.

On the other hand, the product of the present invention is
In all of the test samples Nos. 1 to 4, the rate of decrease in surface potential was small, and in most cases, the rate of decrease in surface potential was less than 2.5%. Looking at this in the relationship between the volume resistivity and the surface potential decrease rate as in the case of the aforementioned PVC insulating film, the surface potential decrease rate is large when the volume resistivity is too high. Was found to be 9.0 × 10 ¹⁵ Ω · cm or less, and more preferably 4.0 × 10 ¹⁴ Ω · cm or less.

Within this range, 25 ° C. × smoke atmosphere, 3
High humidity atmosphere of 2 ℃ × 80% RH or 50 ℃ × 5
In any of the high-temperature atmospheres of 0% RH, the reduction rate of the surface potential can be suppressed to less than 5% or less than 2.5%, and the dust collection efficiency can be maintained for a long time.

The flame retardancy was also tested. As shown in Table 1, the results were as shown in Tables 1 to 3 of the present invention.
4 showed a good result of “equivalent to UL94V-0”, and Comparative Example 1 was “flammable”. This is because when the adhesive used was the product of the present invention, it was flame retardant.
Is caused by non-flame retardancy.
Since it is not directly related to the present invention, further description will be avoided.

The results of various experiments using an insulating film of a PVC resin and a PP resin have been described above. The following can be said as a summary.

There is a correlation between the insulating resin film and the rate of decrease in the surface potential.
The volume resistivity is 3.0 × 1 in both a high humidity atmosphere of 0% RH and a high temperature atmosphere of 50 ° C. × 50% RH.
If it is within the range of 0 ^{11 to} 9.0 × 10 ¹⁵ Ω · cm, the reduction rate of the surface potential can be suppressed to less than 5%, and the high dust collection efficiency can be maintained for a long time even if there is a difference in the use environment. Can be. Volume resistivity is 3.0 × 10 ^{12 to} 4.0 × 10 ¹⁴ Ω
In the range of cm, the decrease in the surface potential is further reduced and can be suppressed to less than 2.5%, and further excellent dust collection characteristics are exhibited.

When a PVC resin is used as the material of the insulating resin film, its volume resistance is controlled to the above-mentioned fixed range by appropriately blending ethylene vinyl acetate copolymer (EVA) with the resin. Can be. EV
The amount of A is in the range of 8 to 20% by weight, more preferably 10 to 18% by weight. Various forms such as graft polymerization and blending are conceivable.
Similar effects can be expected by using vinyl acetate (VA) instead of EVA.

When a PP resin is used as the material of the insulating resin film, maleic anhydride-modified polypropylene (modified PP), an antistatic agent, a conductive filler, or a polymer having low volume resistance can be added to the resin. The volume resistance value of the insulating film can be controlled in the above range. This results in a 25 ° C. × smoke atmosphere, a 32 ° C. × 80% RH high and humid atmosphere,
In any environment of a high temperature atmosphere of 50% RH, the reduction rate of the surface potential can be suppressed to less than 5%, and further less than 2.5%, and high dust collection efficiency can be maintained for a long time. It is.

Although not shown in the above examples,
The present invention can be applied to an electrode printing type in which a conductive paint is printed on one insulating resin film (or sheet) instead of the conductive plate (aluminum plate). Referring to FIG. 5, the cross-sectional structure thereof is described. An electrode is printed on one resin insulating film with a conductive paint, and the other insulating resin film is laminated on the electrode with an adhesive.

Although various embodiments have been described above, it is needless to say that the present invention is not limited to the above-described embodiments and can be improved without departing from the spirit of the present invention. For example, in the above-described embodiment, various materials for controlling the volume resistance value are blended in the PVC-based resin or the PP-based resin. However, the material is not limited to these materials, and the volume resistance value is controlled in the range. If so, other materials are also considered. Further, it is of course possible to add the same compounding agent in place of the above-mentioned various compounding agents, or to add a new compounding agent additionally, which is included in the present invention.

[0058]

As described in the above embodiments, the electric insulating material of the present invention is capable of reducing the surface potential by controlling the volume resistance of the insulating resin film covering the conductive material within a certain range. It is to suppress. Therefore, if the electric insulating material of the present invention is applied to a dust collecting electrode of an air purifier or the like, a high dust collecting efficiency is stably maintained even in a room where cigarette smoke is intense or in a high-temperature and high-humidity environment. Obtained. In addition, the use of a laminate type makes it possible to reduce the thickness of the dust collection electrode, thereby making it possible to narrow the electrode interval, thereby achieving higher performance and compactness. .

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the shape of a test sample used for surface potential measurement as part of a characteristic test of an insulating film according to the present invention.

FIG. 2 is a schematic configuration diagram of a surface potential measuring device.

FIG. 3 is a graph showing a correlation between a volume resistance value of an electric insulating material using a PVC-based insulating film and a rate of decrease in surface potential.

FIG. 4 is a graph showing the relationship between the blending amount of an ethylene vinyl acetate (EVA) copolymer blended in a PVC-based insulating film, the volume resistance value, and the rate of decrease in surface potential.

FIG. 5 is a view showing a type in which an electrode material is printed with a conductive paint as a sectional form according to another embodiment of the insulating film according to the present invention.

FIG. 6 is a diagram schematically illustrating a dust collecting mechanism of the electric dust collector.

7 is a diagram illustrating a detailed configuration of a dust collection unit of the dust collection mechanism illustrated in FIG.

FIG. 8 is a diagram showing a cross-sectional form of a conventionally known mold type electrode insulating sheet. The material of the insulating sheet is a polyvinyl chloride (PVC) resin material.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B32B 27/30 101 B32B 27/30 101 C08L 23/08 C08L 23/08 23/14 23/14 27/06 27/06 H01B 17 / 62 H01B 17/62 (72) Inventor Mitsuaki Shigoku 3600, Gezu, Kitagaiyama, Komaki, Aichi Prefecture Inside Tokai Rubber Industries Co., Ltd. Address Tokai Rubber Industries Co., Ltd. (72) Inventor Tatsumi Enoki 1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd.Yodogawa Works (72) Inventor Yasuhiko Kawauchiyama 1-1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works (72) Inventor Kanji Mogi 1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works (56) References JP-A-3-67407 (JP, A) JP-A-8-138443 (JP, A) JP-A-8-138444 (JP, A) JP-A-7-102141 (JP, A) JP-A-7-216168 (JP) , A) JP-A-6-325626 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 3/16-3/56

Claims (13)

(57) [Claims] The conductive material is filled with an insulating resin through an adhesive.
An electrical insulating material being overturned be the arm, the insulating resin film, polyvinyl chloride (PVC) tree
Fats, at least ethylene vinyl acetate copolymer and / or
Is polyvinyl chloride containing polyvinyl acetate (PV
C) made of a resin material having a volume resistance of 3.0 × 10 ^11.
An electrical insulating material characterized by being in a range of from 9.0 × 10 ¹⁵ Ω · cm. Wherein said insulating resin film, the electrical insulating material according to claim 1, characterized in that d styrene vinyl acetate copolymer are blended 8-20 wt%. 3. A pre-Symbol insulating resin film in addition, the electrical insulating material according to claim 1 or claim 2, characterized in that talc is blended. 4. Before Symbol insulating resin film in addition, the electrical insulating material according to any one of claims 1 to 3, characterized in that polymethyl methacrylate is blended. 5. A method according to claim 1, wherein the conductive material is filled with an insulating resin through an adhesive.
An electrical insulating material being overturned be the arm, the insulating resin film, polypropylene (PP) resin
Contains at least modified polypropylene (modified PP)
From polypropylene (PP) resin material
Ri, volume resistivity of the insulating resin film is 3.0 × ^{10 11}
An electrical insulating material characterized by being in a range of from 9.0 × 10 ¹⁵ Ω · cm. Wherein said insulating resin film, a polypropylene (PP) resin, according to claim 5, characterized that you made of polypropylene (PP) resin material that has <br/> be at least antistatic agent formulation An electrical insulating material according to claim 1. Wherein said insulating resin film is polypropylene (PP) resin, to claim 5, characterized that you made of polypropylene (PP) resin material that has <br/> at least conductive filler is blended Electrical insulation as described. Wherein said insulating resin film, a polypropylene (PP) resin, polypropylene (PP) resin material that has low at least the volume resistivity polymer is contained
Electrical insulating material according to claim 5, wherein the Nalco. 9. The volume resistance value of the insulating resin film is:
3.0 × 10 ¹² ~ 4.0 × 10 ¹⁴ Ω · cm
The electrical insulating material according to any one of claims 5 to 8. Wherein said adhesive claims, characterized in that a flame-retardant adhesive bromine (Br) flame retardant and flame retardant aid is blended in anhydrous maleic acid-modified polypropylene resin adhesive The electrical insulating material according to claim 5. Wherein said conductive material, claims 1, characterized in that a thin sheet or foil material aluminum claims
Item 11. An electrical insulating material according to any one of Items 10 . 12. The conductive material may claim claims 1, characterized in that it is made is printed with a conductive coating on one of the insulating resin film is laminated
11. The electrical insulating material according to any one of 10 above. 13. A dust collecting electrode for an air purifier using the electrical insulating material according to any one of claims 1 to 12 .