JP3145433B2 - Dielectric for ozonizer and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric used for a silent discharge type ozonizer and a method of manufacturing the same.

[0002]

2. Description of the Related Art In general, a silent discharge type ozonizer has a solid insulating dielectric adhered to both sides or one side of a metal electrode to which a high voltage is applied, and the dielectric increases the discharge current between the two electrodes. A silent discharge is generated by restricting the oxygen, and oxygen flowing through the discharge gap is ozonized. Glass, ceramic, silicon rubber, mica, and the like are often used as a material having a high dielectric constant as the dielectric, and these materials are formed into a single plate or a cylindrical body, and are formed into their shapes. It was in close contact with the matching electrode.

[0003]

However, when the above-mentioned materials such as glass, ceramic, silicon rubber, and mica are formed thinly on a single plate or cylindrical body, defects such as cracks or pinholes occur. Therefore, processability is poor, and
In particular, mica has a problem in that an organic substance is mixed therein and the electric insulation is not uniform or is not good.

Further, from the viewpoint of strength, most conventional dielectrics cannot be processed by making the thickness too small, and are limited to a certain thickness. However, there is a problem that the generated heat is stored and the temperature rises, and the generated ozone gas is decomposed to deteriorate the ozone generation rate, and also has a poor electric strength and a poor dielectric property.

According to the present invention, the amount of ozone generated by a dielectric is
If the applied discharge voltage is equal, it is inversely proportional to the thickness of the dielectric, so it was created focusing on the point that it is advantageous to make it thinner. An object of the present invention is to provide a dielectric for an ozonizer capable of improving the processability, characteristics, strength, heat dissipation, dielectric properties, and the like of the dielectric, and a method of manufacturing the same.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a gist that the inorganic fiber sheet is coated with an inorganic coating agent and dried. As this coating method, it is effective to apply or impregnate an inorganic coating agent to an inorganic fiber sheet.

According to the second aspect of the present invention, the inorganic fiber sheet is coated with an inorganic coating agent and dried under pressure, and the coated inorganic fiber sheet is compressed under pressure and dried. , Forming thinner.

According to the third aspect of the present invention, there is provided a dielectric material adhered to at least one of the electrodes for the ozonizer, wherein the dielectric material comprises an inorganic fiber sheet formed to a predetermined thickness, and an inorganic fiber sheet. The gist of the present invention is that the sheet is made up of an inorganic thin film portion coated on a sheet made of a material.

As the inorganic fiber sheet, inorganic fiber paper is used, and its material is glass, ceramic, silica,
Examples include alumina, boron nitride, zirconia, and silicon nitride. Among them, ceramic paper made of ceramics has a low content of impurities such as organic components and has excellent electrical insulation properties.
In addition, it is excellent in homogeneity, has mechanical strength, has little occurrence of cracks or defects such as pinholes even when thin, and has excellent workability. The ceramic paper is, for example, kao wool paper (made by Isolite Industries, Ltd.) made of silicate fiber. The thickness of the ceramic paper is desirably 0.5 mm to 3.0 mm.

The following are examples of inorganic fiber papers using other materials. (1) Sunpaper made of ceramic or alumina fiber (manufactured by Taiyo Chemical Co., Ltd.) (2) Fineflex made of ceramic fiber (manufactured by Nichias Co., Ltd.) (3) Whisker sheet made of silicon nitride (made by Taiyo Chemical Co., Ltd.) (4) Glass fiber filter paper made of glass fiber (manufactured by Toyo Roshi Kaisha, Ltd.) Examples of the inorganic coating agent include metal alkoxides made of aluminum, silicon, zirconium, titanium, and the like, and composites thereof, and ethyl. Silicate and the like. These can be applied to the surface of a metal or a plastic or the like as an inorganic coating agent.
Metal alkoxides are produced by hydrolysis and polycondensation, using a metalloxane polymerized sol as a binder, and by heating and dehydration / dealcoholization reaction to produce a pure inorganic film, film strength and electrical insulation. Because of its excellent properties, it can be used as a dielectric.

Among the metal alkoxides, modified alkyl silicate-based ones are most suitable for coating on the ceramic paper, for example, ETSB6.
000 or 7000 (manufactured by TSB Development Center).

[0012] In addition, ceramics and inorganic fiber papers of other materials can be coated only with inorganic coating agents such as metal alkoxides or inorganic silica such as metal alkoxides with organosilica sol, mica fine powder or alumina. There are also those in which fine powder, whiskers, and the like are mixed to adjust the film thickness and that the local electric strength is increased. These coating agents include the following. (1) Glasca made of metal alkoxide (manufactured by Ribor Co., Ltd.) (2) Ceramica made of a mixture of a metal oxide polymer and an inorganic filler (manufactured by Nippon Research Institute) (3) Silicon alkoxide (4) Aron ceramic made of metal alkoxide (manufactured by Toagosei Chemical Industry Co., Ltd.) (5) Glass modoki made of modified aluminum silicate (manufactured by TSB Development Center) (6) Metal alkoxides composed of various metal alkoxides (manufactured by Sumitomo Cement Co., Ltd.) (7) Graceram composed of metal alkoxides (manufactured by Shinto Paint Co., Ltd.) (8) Organometallic compound as active ingredient Atron (manufactured by Nippon Soda Co., Ltd.) (9) Pyrocoat (Mica, ceramic fine powder mixed with silicone resin) Otakeseramu Co., Ltd.) (10) consisting of ethyl silicate sill ester (Mitsubishi Monsanto Kasei)

[0013]

The dielectric for ozona-other according to the present invention can be thinly adhered to the electrode side.
Since it is porous and has a large contact area with air, the heat generated in the electrode during discharge is efficiently dissipated, and the inorganic coating agent such as a metal alkoxide has excellent electric strength and can improve dielectric properties. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. As shown in FIG. 1, plate-shaped metallic electrodes 1 and 2 are arranged to face positions having a discharge gap. A pair of dielectrics 3 larger than the area of the electrodes 1 and 2 is bonded to the discharge space side of the electrodes 1 and 2.

The dielectric 3 is composed of a ceramic paper 4 as an inorganic fiber sheet and an inorganic coating agent 5 as an inorganic thin film coated on the ceramic paper 4.

The ceramic paper 4 (trade name: Kao Wool Paper Isolite Industries, Ltd., component composition SiO ₂ : 52.3% Al ₂ O ₃ : 47.3%) is made of ceramic, and short fiber ceramic is used. Molded in high density. The thickness of the ceramic paper in this embodiment is of two types, 0.5 mm and 1.0 mm.

The inorganic coating agent 5 (trade name: ET)
SB6000 to 7000 (manufactured by TSB Development Center) contain a modified alkyl silicate component among metal alkoxides and have no impurities such as organic components. The inorganic coating agent 5 is usually in the form of a sol, but changes to a gel by natural drying. .

A power source 6 is connected to the electrodes 1 and 2. Next, a method for manufacturing the dielectric 3 configured as described above will be described. The ceramic paper 4 is impregnated in the inorganic coating agent 5 so as to be saturated.
Then, the ceramic paper 4 is allowed to stand at room temperature for a certain period of time (in this case, 8 hours) to be naturally dried. Thereafter, a ceramic paper 4 was dried (no pressure drying) while heating to 150 ° C., and a paper was further dried (pressure drying) by pressing with a press or a rolling roll or the like. Then, the surface of both inorganic coating agents 5 became glass-like, and the plate thickness as the dielectric 3 was as follows as compared with the material thickness of the ceramic paper 4. (Material thickness) (Dielectric thickness after drying under no pressure (dielectric thickness after drying under pressure)) 0.5 mm 0.30 mm to 0.45 mm 0.25 mm to 0.35 mm 1.0 mm 0.70 mm to 0 0.90 mm 0.60 mm to 0.70 mm The material thickness of the ceramic paper 4 is reduced by non-pressure drying, because the material shrinks by drying. In addition, the inorganic coating agent 5 increased the film strength on the surface of the dielectric 3.

Further, in order to bring the thus-produced dielectric 3 into close contact with the electrodes 1 and 2, first, the surfaces of the electrodes 1 and 2 are pickled, derusted and degreased. Next, a silicon-based adhesive (product number: SE1750) is applied to the surfaces of the electrodes 1 and 2.
(Toray Silicon Co., Ltd.) is applied uniformly and thinly. Thereafter, the ceramic paper 4 provided with the inorganic coating agent 5 is placed on the electrodes 1 and 2, and the electrodes 1 and 2 are heated at 80 ° C. to 1 ° C.
While heating to 00 ° C., the film is pressed and dried by a press or a rolling roll or the like, and completely pressed.

In the case where ozone is generated by using the dielectric material 3 adhered to the electrodes 1 and 2 as described above, when a high voltage is applied to both the electrodes 1 and 2 from the power supply 6, the space between the electrodes 1 and 2 is generated. , Silent discharge is performed, and ozone is generated.

At this time, since the dielectric 3 is formed to have a small thickness, heat stored in the electrodes 1 and 2 at the time of discharge is efficiently released through the dielectric 3. Further, since the inorganic coating agent 5 is coated on the ceramic paper 4 of the dielectric 3 by drying under no pressure or drying under pressure, the electric strength is improved, and the voltage value at which dielectric breakdown occurs increases.

The measurement results of the dielectric breakdown voltage were as follows. (1) Test conditions Electrode: According to FIG. 2 of JISC2110-7.1 electrode.

Breaking current value; 5 A Voltage rising rate; 1 KV / s (2) Result (Material thickness) (breakdown voltage value after drying under no pressure (breakdown voltage value after drying under pressure)) 0.5 mm 6.1 KV 7.3 KV 8.1 KV to 8.9 KV 1.0 mm 10.7 KV to 12.2 KV 13.9 KV to 15.3 KV As described above, the dielectric material 3 obtained by drying under pressure against non-pressurized drying has its dielectric strength. Is improved by about 30%.

The amount of ozone generated when mica as a conventional dielectric and the dielectric 3 of the present invention in a laminated state are compared is as follows. (Number of stacked layers) (Ozone generation amount) 17 sheets (mica) 600 mg / h 14 sheets (dielectric 3) 600 mg / h From these results, it is possible to increase the amount of ozone generation when the number of dielectrics 3 is the same as that of mica. . In addition, the size of the thin plate made of mica cannot be so large in terms of uniformity,
The limit is about 30 cm square, but in the case of the ceramic paper of the dielectric material 3, there is no limitation in this point, and the discharge area can be increased, so that the production of a large output ozone generator can be easily achieved. In this manner, the dielectric for ozonizer 3 of the present embodiment is composed of the ceramic paper 4 and the inorganic coating agent 5, and the ceramic paper 4 is coated with the inorganic coating agent 5 and dried under no pressure or By drying under pressure and molding thinly, mechanical strength can be increased, cracks or defects such as pinholes do not occur, workability is improved, and electrical insulating properties are not mixed with organic substances Can be improved.

Further, since the dielectric 3 is formed thin, the heat stored in the electrodes 1 and 2 at the time of discharge can be efficiently released through the dielectric 3 to improve heat dissipation. Further, since the inorganic coating agent 5 of the dielectric 3 is coated by drying under no pressure or drying under pressure, the withstand voltage is improved, and the voltage value at which dielectric breakdown occurs can be increased. In other words, the higher the voltage at which dielectric breakdown occurs, the higher the voltage to be discharged,
The dielectric properties can be improved.

Further, since the ceramic paper 4 and the inorganic coating agent 5 are less expensive than conventional mica or the like, they can be manufactured at low cost. Furthermore, the inorganic coating agent 5 can improve the ozone resistance of the ceramic paper 4 and can be used for a longer time than before.

It should be noted that the present invention is not limited to the above embodiment, but may be as follows. (1) In the above embodiment, the dielectric 3 is adhered to only one surface of the electrodes 1 and 2, but may be adhered to both surfaces of the electrodes 1 and 2. (2) In the above embodiment, only the ceramic paper 4 was coated with the inorganic coating 5, but if necessary,
The surfaces of the electrodes 1 and 2 may be coated. (3) Although the electrodes 1 and 2 have a plate shape in the above embodiment, they may be used as irregularly shaped electrodes such as a corrugated shape and a V-shaped shape. (4) In the above embodiment, the ceramic paper 4 is used. Was impregnated in the inorganic coating agent 5 so as to be saturated, and the ceramic paper 4 was allowed to dry at room temperature for a certain period of time. However, this drying step was omitted, and the next non-pressure drying or You may transfer to a pressure drying process.

[0028]

As described above in detail, according to the dielectric material for an ozonizer and the method of manufacturing the same according to the present invention, the dielectric material comprises an inorganic fiber sheet and an inorganic thin film portion coated on the inorganic fiber sheet. By forming them and drying them under no pressure or by drying them under pressure, there is an excellent effect that the workability, characteristics, strength, heat dissipation, dielectric properties and the like of the dielectric can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of an ozonizer according to the present embodiment.

[Explanation of symbols]

1, 2 electrodes, 3 dielectrics, 4 ceramic paper as inorganic fiber sheet, 5 inorganic coating agent as inorganic thin film portion.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C01B 13/11 H01B 3/00 H01T 23/00

Claims (3)

(57) [Claims] 1. A method for producing a dielectric for an ozonizer, comprising coating an inorganic fiber sheet with an inorganic coating agent and drying the sheet. 2. A method for producing a dielectric material for an ozonizer, comprising coating an inorganic fiber sheet with an inorganic coating agent and drying the sheet under pressure. 3. A dielectric material adhered to at least one of the electrodes for the ozonizer, wherein the dielectric material is formed on an inorganic fiber sheet formed to a predetermined thickness, and on the inorganic fiber sheet. A dielectric for an ozonizer, comprising a coated inorganic thin film portion.