JP2009099332A - Insulated voltage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contribute to global environment conservation during insulating treatment of a conductive member of a voltage device; and to give sufficient durability (for example, strength and degradation-resistance) and electrical characteristics to the voltage device. <P>SOLUTION: A polymer composition obtained by adding and kneading a hydrolysis inhibitor and a crosslinking agent against a polymer material with a biobased material (biodegradable resin or the like) as a base material, is pulverized to obtain an insulative powder. The insulative powder is powder-coated on an insulated section of the conductive member of the voltage device. Thus a biobased insulating member is coated on the insulated section of the conductive member. A petroleum-derived insulating member where a polymer composition consisting of a polymer material with a petroleum-derived material(biodegradable resin or the like) as a base material is melted and again solidified in a designated shape (a tube or the like), is coated to protect an outer periphery face of the biobased insulating member. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an insulated voltage device, and relates to an insulation process for a voltage device including a switchgear such as a circuit breaker or a disconnector in a housing.

  For example, in voltage equipment (heavy electrical equipment such as high-voltage equipment) equipped with switchgear such as circuit breakers and disconnectors in the housing, capacity and size have been reduced along with sophistication and concentration of society. There is also a strong demand for improvements in safety and reliability (for example, mechanical properties (dielectric breakdown field characteristics, etc.), electrical properties). For example, some of the conductive members of the voltage device are appropriately subjected to insulation treatment (covering the conductive portion (molding) with an insulating material) from the viewpoint of miniaturization and safety of the voltage device. As this insulation treatment, a desired part (hereinafter referred to as an insulated part) is formed into a desired shape such as a heat-shrinkable tube made of an insulating polymer material (tube shape, sheet shape, etc.). Applying a method of coating with an insulator), or applying a powder coating method of powder that has been atomized to such an extent that a coating can be formed on the portion to be insulated (hereinafter referred to as insulating powder) It is known.

  As the insulating member, for example, a material made of a polymer material based on a petroleum-derived substance (starting material) such as a thermoplastic resin (polyethylene, etc.) or a thermosetting resin (epoxy resin, etc.) according to the purpose of use (hereinafter referred to as “insulating member”) Have been used in general, but disposal of the petroleum-derived insulating member may cause various problems from the viewpoint of global environmental conservation. For example, if a method of incinerating petroleum-derived insulating members is applied, various harmful substances and carbon dioxide are discharged in large quantities, which may cause problems such as environmental pollution and global warming. On the other hand, although a method of simply landfilling petroleum-derived insulating members can be applied, the final disposal site related to the landfill treatment tends to decrease year by year. In addition, there are attempts to collect and reuse (recycle) petroleum-derived insulating members, but they are not well established because they require significant collection costs and energy (energy in the combustion process for reuse). Almost never done. Exceptionally, only petroleum-derived insulating members (polyethylene cables used in voltage equipment) with relatively uniform quality are collected and used as thermal energy. However, since this thermal energy requires a combustion treatment process, Like this, there is a risk of causing problems such as environmental pollution and global warming.

  In recent years, an insulating member (hereinafter referred to as a biologically-derived insulating member) made of a polymer material based on a biological material (such as a biodegradable resin) has begun to attract attention (for example, Patent Documents 1 and 2). ), Because it has biodegradability (for example, physical properties that are easy to melt at a relatively low temperature), durability (for example, life of strength, deterioration resistance, etc.) is low compared to petroleum-derived insulating members, In particular, it is unsuitable for products such as voltage devices that need to maintain sufficient electrical characteristics (for example, sufficient insulation) for a long period of time, and is not actually applied as an industrial material. For example, even a biologically-derived insulating member that has been solidified into a desired shape (solidified into a sheet shape, a pellet shape, etc.) may be deformed when mounted on an insulated treatment site, It is easily damaged by friction. In addition, when the powder coating method is applied, there is a risk that the thickness of the biological insulating member becomes insufficient or non-uniform.

For this reason, the said biological-derived insulating member has been limited to application to simple products that do not require durability, electrical characteristics, etc. (for example, household goods that are difficult to collect such as so-called one-way containers).
JP 2002-53699 A JP 2002-358829 A.

  As described above, in the insulation treatment of conductive members of voltage equipment, it contributes to global environmental conservation and can provide sufficient durability (for example, strength, deterioration resistance, etc.) and electrical characteristics. It is requested to do.

  The present invention has been made on the basis of the above problems, and in the insulation treatment of conductive members of voltage equipment, is totally different from the technology applied to daily necessities as described above, and can contribute to global environmental conservation. An object of the present invention is to provide an insulated voltage device that can provide sufficient durability and electrical characteristics.

  Specifically, according to the first aspect of the present invention, a portion to be insulated is insulated among conductive members of a voltage device, and a polymer material based on a biological substance and a molecule- It consists of a polymer composition containing a hydrolysis inhibitor having an N = C = N-structure and a cross-linking agent having an —O—O— structure in the molecule, and powder coating is applied to the above-mentioned insulation target site. A bio-insulating member coated by the method and a polymer composition containing a polymer material based on a petroleum-derived substance, which is formed into a tube and coated with the bio-insulating member. And an insulating member.

  The invention according to claim 2 is the invention according to claim 1, wherein the polymer material based on the biological substance is acetylated cellulose, polylactic acid, polybutylene succinate, polytrimethylene terephthalate, esterification. It is characterized by comprising at least one bio-based polymer among starch, starch-based polymer, and chitosan-based polymer.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the polymer material based on the petroleum-derived substance is polyethylene, polypropylene, polyvinyl chloride, silicone, modified silicone, polyvinyl alcohol, modified It is characterized by comprising at least one base polymer of polyvinyl alcohol, ethylene-propylene terpolymer, and nitrile-butadiene rubber.

  According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the hydrolysis inhibitor comprises a carbodiimide compound.

  According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the cross-linking agent comprises a peroxide.

  A sixth aspect of the invention is characterized in that, in the first to fifth aspects of the invention, the edge of the tubular petroleum-derived insulating member on the opening side is sealed.

  The invention according to claim 7 is the invention according to claim 6, wherein in the sealing treatment, an inorganic adhesive comprising water glass or solder, or an acrylic resin, an ethylene-vinyl acetate resin, an epoxy resin, an isocyanate resin, An organic adhesive comprising at least one of phenol resin, urea resin, silicone resin and modified products of each resin is used.

  The invention according to claim 8 is the invention according to claims 1 to 7, characterized in that the polymer composition used for the biological insulating member contains a vegetable oil-based or petroleum-based plasticizer.

  The invention according to claim 9 is the invention according to claim 8, characterized in that the vegetable oil-based plasticizer comprises epoxidized soybean oil or epoxidized linseed oil.

  According to the first to fifth aspects of the present invention, when the desired insulation treatment is performed in the electric device, the use ratio of the petroleum-derived material is reduced as compared with the case where only the petroleum-derived insulating member is covered. Moreover, it becomes easy to provide sufficient insulation (breakdown voltage value, breakdown electric field value, etc.), strength, deterioration resistance, and the like as compared with the case where only the biological insulating member is covered.

  According to the sixth and seventh aspects of the invention, it becomes easy to prevent intrusion of air, moisture and the like between the biological insulating member and the petroleum insulating member.

  According to the eighth and ninth aspects of the invention, the elastic modulus of the biologically-derived insulating member is reduced, and the difference in linear expansion coefficient between the conductive member (insulated part to be insulated) and the biologically-derived insulating member is reduced.

  As mentioned above, according to invention of Claims 1-9, it can contribute to global environmental conservation compared with the prior art which only coat | covers only a petroleum-derived insulating member, and compared with the prior art which only coat | covers only a biological-derived insulating member. Sufficient durability (for example, life of strength, deterioration resistance, etc.), electrical characteristics, and the like. According to the inventions of claims 6 to 9, durability is further improved, It can be sufficiently applied to voltage devices such as.

  Hereinafter, an insulated voltage device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  The present embodiment relates to an insulation treatment of an insulated treatment site among conductive members of a voltage device, for example, and is different from a conventional technique in which only a biological-derived insulating member or a petroleum-derived insulating member is covered. These techniques are used together to coat with a two-layer insulating member. That is, as compared with the prior art in which only the petroleum-derived insulating member is covered by coating the biologically-derived insulating member on the above-described insulated treatment site and coating the biological-derived insulating member with the petroleum-derived insulating member. In addition to contributing to global environmental conservation, it is possible to provide sufficient durability (for example, life of strength, deterioration resistance, etc.), electrical characteristics, etc. compared to conventional technologies that only cover biologically-derived insulating members. Is.

<Biological insulating material>
In the biological insulating member of the present embodiment, a polymer composition obtained by adding a hydrolysis inhibitor, a crosslinking agent and the like to a polymer material based on a biological material (such as a biodegradable resin) and kneading. Is used to coat the portion to be insulated by powder coating an insulating powder obtained by micronizing the polymer composition.

[Polymer material]
As the polymer material applied to the polymer composition of the biological insulating member, various materials can be applied depending on the type of biological material used as the base material, the production process, etc. From the viewpoint, bio-based polymers classified into acetylated cellulose, polylactic acid, polybutylene succinate, polytrimethylene terephthalate, esterified starch, starch-based polymer, chitosan-based polymer, etc. can be mentioned. Or more than one. Of these, those made of polybutylene succinate are relatively flexible.

  Of the components of the polybutylene succinate, succinic acid and butanediol are generally derived from petroleum. However, in recent years, those derived from living organisms have started to appear. It is clear that succinate can be applied as a bio-based polymer.

  Since these bio-based polymers are carbon neutral, it is considered that new carbon dioxide is hardly generated even if a product or the like using the bio-based polymer is incinerated.

[Hydrolysis inhibitor]
As a hydrolysis inhibitor applied to the polymer composition, a —N═C═N— structure (R ₁ —N═C═N—R ₂ structure (R ₁ and R ₂ are alkyl groups) in the molecule) For example, a carbodiimide compound may be used, for example, which exhibits an effect of inhibiting hydrolysis by a supplementary reaction with active hydrogen (carboxylic acid generated by hydrolysis, active hydrogen of hydroxyl group). Although the physical properties and reaction rate of the hydrolysis inhibitor itself vary depending on the types of R ₁ and R ₂ , the essential functions (such as supplementary reaction with active hydrogen) are substantially the same.

[Crosslinking agent]
As a crosslinking agent applied to the polymer composition, one having an —O—O— structure in the molecule and causing a crosslinking reaction at a predetermined temperature is used, and examples thereof include peroxide. This peroxide has the property of radically decomposing the —O—O— structure site under the influence of heat, and can be applied as a cross-linking agent. Various peroxides having different half-life temperatures (for example, Japanese fats and oils) Perhexa V (10-hour half-life temperature 105 ° C), Permill D (10-hour half-life temperature 116 ° C), Perhexa 25B (10-hour half-life temperature 118 ° C), Perbutyl P (10-hour half-life temperature 119 ° C) Perbutyl C (10-hour half-life temperature 120 ° C), Perhexyl D (10-hour half-life temperature 116 ° C), Perbutyl D (10-hour half-life temperature 124 ° C), Perhexine 25B (10-hour half-life temperature 128 ° C)) Are known.

  When the peroxide is kneaded with a polymer material or the like, the temperature rise of the kneaded material depends on the kneading machine, the blending amount of the polymer material or the like in the kneaded material, kneading conditions, the presence or absence of a cooling mechanism, etc. Different. For example, the polymer material is maintained in an atmosphere at a temperature higher than the melting temperature of the polymer material, and the polymer material may self-heat (shear heat is generated). May cause a reaction.

  For this reason, it is preferable to select appropriately (for example, to select a peroxide having a half-life temperature in the vicinity of the melting temperature or above) in the kind, blending amount, and the like of the peroxide. For example, when the melting temperature of the polymer material is about 110 ° C. and the shear heat is about 20 ° C., for example, perbutyl D, perhexine 25B, or the like is used. In addition, in peroxide, there are products that are handled as dangerous goods from the viewpoint of the Fire Service Law, but there are also non-dangerous goods grade products that contain, for example, inert fillers, etc. It is preferable.

[Insulating powder]
As an insulating powder obtained by pulverizing the polymer composition, a biological insulating member can be formed on a target conductive member (insulated treatment site) by a powder coating method using the insulating powder. Apply a finely pulverized one. For example, the average particle size is about 30 μm to 300 μm, preferably about 50 μm to 250 μm. In addition, for example, those having a relatively large average particle diameter (for example, those having a particle size of 500 μm or more) are excluded or re-micronized (to the extent that a biologically-derived insulating member can be formed on the part to be insulated by the powder coating method). It may be applied after pulverization. In addition, although the particle size and powder shape of the insulating powder obtained by pulverization vary depending on the type of device (model, model, etc.) used for pulverization, the pulverization time, etc., as described above. Any range may be used as long as the target biological insulating member can be formed by the powder coating method.

  Various milling apparatuses can be applied to the apparatus used for the above-mentioned micronization, and examples include apparatuses using rotation, impact, vibration and the like. It should be noted that heat is not a little generated during the pulverization by the mill apparatus, and the intended insulating powder itself may be unintentionally melted (self-bonded) or deteriorated due to the heat. In such a case, it is preferable to cool the entire mill device or a part (part relating to pulverization), and the polymer composition itself before pulverization is cooled in advance (refrigerator, freezer, liquid nitrogen, etc.). Cooling). In addition, when the polymer composition cannot be charged into the mill apparatus due to a large lump state of the polymer composition, the polymer composition may be coarsely pulverized to such an extent that the polymer composition can be charged.

  As a method for preventing fusion (self-fusion) and adhesion between powders in the insulating powder, a polymer composition containing inorganic powders such as silica and calcium carbonate in addition to a polymer material is used. A method for making fine particles is also conceivable. The inorganic powder can be appropriately used as long as it does not impair the properties of the target insulating powder. For example, those having an average particle size of about 0.1 μm to 20 μm are 0.1 wt% to 10 wt%. %Added.

[Coating method]
Examples of the powder coating method include a fluid dipping method and an electrostatic coating method. Although the fluid immersion method and the electrostatic coating method are different from each other, the purpose (coating) and the result (the degree of coating) are the same.

  In the case of the fluidized immersion method, the surface of the insulation target portion of the target conductive member is preheated (preheated), and the conductive member (at least in the fluidized immersion bath filled with insulating powder) In other words, the insulating powder is soaked by the above preheating to melt the insulating powder, and the melt is attached to the insulated portion to form a biological insulating member. In the fluidized immersion bath, holes having a shape equivalent to or smaller than the size of the insulating powder (B stage in the case of thermosetting resin) or less than the size of the insulating powder are side walls (bottom wall, etc.). And a porous type structure having a plurality of perforations, for example, those obtained by sintering, fiber cloth, or machining.

  By injecting an inert gas such as air, dry air, nitrogen, and dry nitrogen from each hole formed in the side wall as described above into the fluid immersion bath (ejecting under atmospheric pressure), The insulating powder in the fluid immersion bath can be fluidized. Then, the insulating part that has been heated as described above is brought into contact with the insulating powder that flows as described above (soaked in a fluidized immersion bath) to thereby insulate the part to be insulated. A melt of conductive powder adheres and is coated.

The flow rate of the inert gas is appropriately set according to the particle size, distribution, shape, density, etc. of the target insulating powder. For example, based on the linear velocity (cm / min) of the value obtained by dividing the gas flow rate (cm ³ / min) by the effective area (effective area (cm ² ) of the region where the inert gas is uniformly ejected in the fluidized immersion bath). Can be set. For example, it is set to about 0.5 cm / min to 50 cm / min (more preferably 1 cm / min to 20 cm / min).

[Conductive member (insulated part)]
The conductive member (insulated part) to be coated can be made of various materials (copper, iron, aluminum, etc.) and shapes (cylindrical, A prismatic shape, a linear shape, a flat plate shape, a knitted wire shape, or the like can be applied, and examples thereof include a copper bus bar. For example, there is no major problem even if an edge portion is present in the part to be insulated. However, when the edge portion is chamfered (C surface processing, R surface processing), the edge cover ratio is improved and the insulating powder is improved. The thickness of the biological insulating member due to the melt of the body is sufficient, and the risk of cracking of the biological insulating member due to stress can be reduced, which is preferable. For example, when a conductive member (for example, a bus bar) is formed by pultrusion molding or the like, it is preferable that the edge portion is an R surface. The degree of risk reduction varies depending on the degree of the chamfering process, but there is no major problem even if the edge portion exists as described above. What is necessary is just to carry out suitably.

  Of the conductive members, for example, portions that require electrical conductivity (for example, locations that can be electrically connected) and locations that are related to work holding, positioning, etc. (positioning holes, etc.) do not require insulation treatment. It is preferable to perform masking.

  The preheating temperature of the surface to be insulated is set to a temperature range in which the melt of the insulating powder adheres and is coated when the portion to be insulated is immersed in the fluidized immersion bath, and the processing temperature of the insulating powder ( (Softening temperature, melting point, glass transition temperature, etc.), heat capacity (heat capacity due to specific heat, specific gravity, shape, etc.), heat dissipation (cooling) characteristics, and thickness of target biological insulating material It can be set. When the preheating temperature is too low, the insulating powder (melt) becomes difficult to adhere to the part to be insulated, and when the preheating temperature is too high, discoloration, foaming, expansion, etc. occur in the coated biological insulating member. In order to generate easily, it is set as the range from the temperature 20 degreeC lower than the processing temperature of insulating powder to the temperature which this insulating powder decomposes | disassembles, for example. Preferably, the range is from the processing temperature of the insulating powder to a temperature 100 ° C. higher than the processing temperature. A specific example of the case where the insulating powder of the present embodiment is applied includes a temperature range of about 110 ° C. to 240 ° C.

  The soaking time and soaking position (spatial position and direction during soaking) of the part to be insulated with respect to the fluidized immersion bath depends on the thickness of the biologically-derived insulating member by the melt, the preheating temperature of the part to be insulated, the shape, etc. The immersion may be repeated a plurality of times.

  In addition, during the period from the start of immersion of the part to be insulated to the constant immersion time, the biological insulating member thickness increases with time, but after the predetermined immersion time, the biological insulating member thickness is It tends to be constant or non-uniform (surface condition is rough). For example, depending on the shape of the part to be insulated, the melt may be difficult to fix (for example, when peeled) or may hang down due to gravity, and the thickness tends to be non-uniform. Such a tendency seems to occur even if the preheating temperature is too low or too high, and it is preferable to appropriately adjust the immersion time, the number of immersions, the immersion position, the preheating temperature of the part to be insulated, and the like.

  Further, the biological insulating member coated as described above may be cross-linked by performing a heat treatment or the like. For example, the cross-linking may be performed by heat treatment that can be performed after coating as described above (for example, heat treatment for the purpose of reducing the thickness variation of the coating, surface roughness, internal stress, etc.).

<Oil-derived insulating material>
In the petroleum-derived insulating member of this embodiment, a polymer composition made of a polymer material based on a petroleum-derived substance (such as a biodegradable resin) is used, and the polymer composition is melted to obtain a desired shape ( For example, what is solidified into a shape corresponding to the shape of the part to be insulated, the thickness of the biological insulating member, etc., and formed into a tube shape, a sheet shape or the like is applied. Specifically, a heat shrinkable tube etc. are mentioned.

[Polymer material]
As the polymer material applied to the polymer composition of the petroleum-derived insulating member of the present embodiment, various materials can be applied depending on the type of petroleum-derived substance, the production process, etc., for example, polyethylene, polypropylene, polyvinyl chloride, silicone , Modified silicone, polyvinyl alcohol, modified polyvinyl alcohol, ethylene-propylene terpolymer, nitrile-butadiene rubber, etc., and base polymers having insulating properties. These base polymers can be used singly or in combination as appropriate.

[Coating method]
The petroleum-derived insulating member is coated so as to protect the outer peripheral surface of the biological-derived insulating member coated on the part to be insulated. For example, in the case of a heat-shrinkable tube, the biological-derived insulating member The outer peripheral surface of the derived insulating member is wrapped, and both are brought into close contact with each other by shrinkage treatment (heat treatment) under predetermined conditions.

  When the petroleum-derived insulating member and the biological-derived insulating member are sufficiently adhered (for example, adhered by shrinkage treatment), for example, there is a low possibility that air, moisture, etc. intrude between them, but if necessary As described above, the edge of the petroleum-derived insulating member or the like (in the case of a heat-shrinkable tube, both ends of the tube (opening side)) may be sealed.

  Examples of the sealing process include a method of performing a physical process such as caulking, and a method of performing a chemical process using an adhesive or the like. Adhesives include inorganic adhesives such as water glass and solder, acrylic resins, ethylene-vinyl acetate resins, epoxy resins, isocyanate resins, phenol resins, urea resins, silicone resins, and modified products of each resin (for example, Organic adhesives such as modified silicone).

<Others>
In the bio-derived insulating member and petroleum-derived insulating member of the present embodiment, in addition to the polymer material, various additives generally used in the field of polymer material molding technology, such as a heat stabilizer, a light stabilizer, etc. Aiming at agents (ultraviolet ray inhibitors), antioxidants, anti-aging agents, pigments, colorants, inorganic fillers (fillers), fine inorganic fillers (nanoparticles), flame retardants, antibacterial agents, anticorrosion agents, etc. Insulating powder for voltage equipment, insulation processing method, and voltage equipment may be appropriately used as long as the characteristics of the voltage equipment are not impaired.

  For example, in the case of biologically derived insulating members, cross-linking by addition of peroxide for the purpose of stabilizing the coating by the melt in the powder coating method, addition of a coupling agent for the purpose of stabilizing the functional group, etc. You can go.

  Moreover, since a thermal stress etc. may generate | occur | produce between a electrically-conductive member (insulation process site | part) and a biological-derived insulating member by both linear expansion coefficient difference, the polymer composition of a biological-derived insulating member is needed as needed. In this case, the one containing a plasticizer or the like is applied. As the plasticizer, various plasticizers can be applied as long as they are soluble in the polymer composition and can reduce the elastic modulus of the biological insulating member and relieve the thermal stress. Specifically, epoxidized vegetable oils such as epoxidized soybean oil and epoxidized linseed oil as chemicals based on vegetable oils, phosphate esters, phthalic acid esters, aliphatic basic acid esters, dihydric alcohol esters, Examples thereof include polymers of oxyacid esters, camphor, methyl abietate, and polypropylene glycols, and these plasticizers can be used singly or in combination as appropriate.

  Next, an example of an insulated voltage device in the present embodiment will be described. In each of the following embodiments, both ends of a rectangular flat plate (length: 1200 mm, width: 40 mm, thickness: 5 mm) are masked on both sides (regions of 100 mm in the longitudinal direction from the respective ends), and the copper bus bar The center part (other than the masking region) is coated with a biological insulating member by using an insulating powder under various conditions by a fluid immersion method, and further covering the biological insulating member with a petroleum-derived insulating member. As a result, various samples were obtained, and the electrical characteristics and durability of each sample were examined.

[Example 1]
As a biological insulating member, first, 100 phr of pellet-shaped polybutylene succinate (GS Pla AZ-61T (MI = 30) manufactured by Mitsubishi Chemical Corporation) was sprinkled with 2 phr of liquid peroxide (Perbutyl D manufactured by Nippon Oil & Fats Co., Ltd.). The mixture was premixed with 4 phr of powdered carbodiimide (Carbodilite LA-1 manufactured by Nisshinbo Industries, Inc.). Next, the mixture is put into a twin-screw kneader-extruder (ZE40A manufactured by Belstolf) and kneaded, and the kneaded product is swept into a strand (swept at a twin-screw extrusion temperature of 130 ° C.) and then long by a pelletizer. A pellet-shaped polymer composition was obtained by cutting into a shape of about several millimeters. Then, while cooling the spiral mill (manufactured by Seishin Enterprise Co., Ltd.) (cooling the whole mill device or a part of the mill), the mill was cooled with the above-described polymer composition (refrigerator or liquid nitrogen as required) (Polymer composition) was added and pulverized to obtain an insulating powder having an average particle size of 30 to 300 μm.

  Thereafter, the insulating powder is put into a fluidized immersion tank (manufactured by Nakata Coating Co., Ltd.), and an inert gas (nitrogen gas) is ejected into the immersion tank (a flow rate of 0.5 to 50 cm / min). The insulating powder is flowed, and the masked copper bus bar surface is preheated in a temperature range of 110 to 240 ° C. and then immersed in the insulating powder once or twice (each immersion time is 1 to 20). The sample P1 coated with the biologically-derived insulating member (thickness: 1.4 mm) was obtained by adhering a melt of the insulating powder.

  In addition, the biologically-derived insulating member of the sample P is covered with a heat-shrinkable tube (Nishitube NPR (40-20-1) manufactured by West Japan Electric Cable Co., Ltd.) as a petroleum-derived insulating member, and 30 in a furnace at 150 ° C. A sample (a sample having a thickness of 1 mm of a petroleum-derived insulating member) S1 was obtained by allowing the sample to stand for shrinkage.

  Then, in each of the samples P and S1, by measuring the breakdown voltage value (BDV value) and the breakdown electric field value when an AC voltage is applied (applied to both ends where the melt was not covered by masking) The electrical characteristics were examined, and the results are shown in Table 1 below. In addition, the samples P and S1 are placed in a constant temperature and high humidity tank (95 ° C-95RH%, acceleration magnification; temperature is 10 ° C-2 times speed, humidity is proportional to absolute humidity, and there is no synergistic effect of temperature-humidity) Assuming that the dielectric breakdown voltage value is intentionally degraded to 80% or less of the initial value, the durability is examined by recording the number of days until the degradation treatment as the accelerated life days. The results are shown in Table 1 below.

  From the results shown in Table 1, the sample S1 using both the biologically-derived insulating member and the petroleum-derived insulating member has a particularly high dielectric breakdown voltage value and an accelerated lifespan as compared with the sample P using only the biologically-derived insulating member. Since it is long (more than twice as long), it was found that both electrical characteristics and durability were good. Moreover, it can be read from the accelerated life days due to the above-described deterioration treatment that the durability of the sample S1 is sufficient to satisfy a general heavy electrical equipment warranty period (about 30 years). Further, for example, it can be read that the insulating member having a sufficient thickness of the two-layer structure is covered with the petroleum-derived insulating member without increasing the thickness of the biological insulating member.

[Example 2]
In Example 2, in the sample S1, both ends (openings) of the petroleum-derived insulating member (heat-shrinkable tube) covered with the biological insulating member were bonded with an epoxy adhesive (# 4538 manufactured by Cotronics). The sample S2 was obtained by performing a sealing treatment with Also, a sample S3 was obtained by applying a modified silicone adhesive (PM100 manufactured by Cemedine Co., Ltd.) instead of the epoxy adhesive and performing a sealing treatment. Then, electrical characteristics and durability were examined by the same method as in Example 1, and the results are shown in Table 2 below.

  From the results shown in Table 2, the sealed samples S2 and S3 have the same breakdown voltage value and breakdown electric field value as compared with the non-sealed sample S1, and the accelerated life days are further increased (1.2). It was found that both electrical characteristics and durability were good. In particular, it can be seen that the sealing process reliably prevents the entry of air, moisture, etc. between the biological insulating member and the petroleum insulating member.

[Example 3]
In Example 3, 100 phr of polybutylene succinate, 2 phr of peroxide, and 4 phr of carbodiimide, which are the same as those of the sample S1, are used in the biological insulating member. The biologically-derived insulating member and the petroleum-derived insulating member are sequentially formed on the copper bus bar by the same method as the sample S1, and then the sealing process is performed by the same method as the samples S2 and S3 to obtain the sample S4 (using epoxy adhesive) And S5 (using a modified silicone adhesive). Then, the electrical characteristics and durability were examined by the same method as in Example 1. In addition, assuming the temperature change assumed in the actual environment of the voltage device (change from the high temperature region that can be applied to the bus bar to the low sound region that can be applied when the device is stopped in Hokkaido in winter), the samples S4 and S5 are The work (1 cycle; 100 ° C., 8 hours, −40 ° C., 8 hours, transient time 4 hours each), which is left in a high temperature atmosphere (100 ° C.) and a low temperature atmosphere (−40 ° C.), is repeated 30 cycles. After performing the heat cycle test, each dielectric breakdown voltage value (hereinafter referred to as a post-heat cycle breakdown voltage value) was measured. In Samples P and S1 to S3, the breakdown voltage value after heat cycle was measured by the same method as Samples S4 and S5.

  As shown in Table 3, in samples P and S1 to S3 that do not use a plasticizer, the biological insulating member was damaged before the heat cycle test was completed. It can be seen that thermal stress has occurred with the originating insulating member. On the other hand, the samples S4 and S5 using the plasticizer have the same breakdown voltage value, breakdown electric field value, and accelerated life days as compared with the samples S2 and S3, and the breakdown voltage value after the heat cycle is almost the same as the initial value. Since it did not change, it was found that both electrical characteristics and durability were good. In particular, it can be seen that the use of a plasticizer has high durability against temperature changes and is more suitable for an actual voltage device.

  In the formation of the biologically-derived insulating members S1 to S5, when the preheating temperature was set to 100 ° C. to 280 ° C., when the preheating temperature was 100 ° C. or less, the coating of the insulating powder with the melt was observed. In other words, it was confirmed that discoloration, foaming, expansion and the like were likely to occur in the biological insulating member when the preheating temperature was 260 ° C. or higher. In addition, when the preheating temperature is about 110 ° C. to 240 ° C., it was possible to sufficiently form the biological insulating member, and it was confirmed that the above-described discoloration, foaming, expansion and the like did not occur.

  Therefore, as in Examples 1 to 3, the biologically-derived insulating member is coated on the part to be insulated, and the biologically-derived insulating member is covered with the petroleum-derived insulating member. By applying a plasticizer or sealing with an adhesive, the insulation of conductive members of voltage equipment contributes to global environmental conservation and has sufficient durability (for example, strength, deterioration resistance, etc.) It can be confirmed that it can be applied to voltage devices such as actual heavy electrical devices.

  Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention. Such variations and modifications are naturally within the scope of the claims.

Claims (9)

Of the conductive member of the voltage device, the part to be insulated is insulated,
A polymer material comprising a biological material as a base material, a hydrolysis inhibitor having a —N═C═N— structure in the molecule, and a crosslinking agent having a —O—O— structure in the molecule. A biologically-derived insulating member made of a molecular composition and coated by a powder coating method on the above-mentioned insulating treatment site;
A petroleum-derived insulating member comprising a polymer composition containing a polymer material based on a petroleum-derived substance, molded into a tube shape and covered with the biologically-derived insulating member;
An insulated voltage device characterized by comprising:   The polymer material based on the biological material is at least one of acetylated cellulose, polylactic acid, polybutylene succinate, polytrimethylene terephthalate, esterified starch, starch-based polymer, and chitosan-based polymer. The insulated voltage device according to claim 1, comprising: a bio-based polymer.   The polymer material based on the petroleum-derived substance is any one of polyethylene, polypropylene, polyvinyl chloride, silicone, modified silicone, polyvinyl alcohol, modified polyvinyl alcohol, ethylene-propylene terpolymer, and nitrile-butadiene rubber. 3. Insulated voltage device according to claim 1 or 2, characterized in that it comprises one or more base polymers.   The insulated voltage device according to claim 1, wherein the hydrolysis inhibitor is composed of a carbodiimide compound.   The insulated voltage device according to claim 1, wherein the crosslinking agent is made of peroxide.   6. The insulated voltage device according to claim 1, wherein an edge of the tubular petroleum-derived insulating member on the opening side is sealed.   Among the above-mentioned sealing treatment, among inorganic adhesives made of water glass or solder, or acrylic resin, ethylene-vinyl acetate resin, epoxy resin, isocyanate resin, phenol resin, urea resin, silicone resin, and modified products of each resin 7. The insulated voltage device according to claim 6, wherein an organic adhesive composed of at least one of them is used.   The insulated voltage apparatus according to claim 1, wherein the polymer composition used for the biological insulating member includes a vegetable oil-based or petroleum-based plasticizer.   9. The insulated voltage device of claim 8, wherein the vegetable oil based plasticizer comprises epoxidized soybean oil or epoxidized linseed oil.