JP2008257977A - Insulating composition for voltage equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulating composition for voltage equipment capable of providing sufficient properties and safety or the like of voltage equipment, and contributing to global environment preservation. <P>SOLUTION: Epoxy resin is applied as a polymer component, and coal ash generated as a byproduct of a thermal power plant or the like is applied as inorganic filler (reuse of the coal ash). Various additives such as a curing agent is appropriately compounded to the epoxy resin and inorganic filler to obtain kneaded material. The kneaded material is cast in a mold to form in a desired shape, is three-dimensionally cross-linked by thermal treatment to form the insulating composition. Fly ash, for example, is applied as the coal ash. A silane coupling agent or the like is applied as the additive. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an insulating composition for a voltage device, and is used for an insulating configuration of a high voltage device, a heavy electrical device or the like provided with a switching device such as a circuit breaker or a disconnect device in a casing, for example. .

  For example, applied to insulation structures (for example, parts that require insulation) of voltage equipment (high voltage equipment, heavy electrical equipment, etc.) equipped with switching devices such as circuit breakers and disconnectors in the housing (for example, exposed directly to the outdoors) Applied to the polymer components such as petroleum-derived thermosetting resins (resins starting from petroleum; epoxy resins, etc.), curing agents, fillers (inorganic fillers, etc.), and auxiliary agents (silanes) A composition formed by curing an insulating material blended with various additives such as a coupling agent, a curing accelerator, etc., for example, a product composed of a composition formed by casting an insulating material (mold cast product; Have been widely known in the art (for example, Patent Document 1).

  With the sophistication and concentration of society, the capacity, size, and physical properties of high-voltage devices (such as electrical properties (dielectric breakdown field properties), mechanical properties (bending strength, etc.)) are increasing. In addition to the demand, improvement of various characteristics has been demanded for the insulating product.

  For example, polymer components such as epoxy resins that influence the physical properties of insulating products are petroleum-derived substances (limited resources), so dispose of the above insulating products (for example, due to lifetime or failure) ) Is being collected and reused (recycled). However, the reuse method has not been established and is hardly performed. Exceptionally, only members with relatively uniform quality (PE cable covering members used in insulating products) are recovered and used as thermal energy, but this thermal energy requires a combustion treatment process, so the environment There is a risk of causing problems such as pollution and global warming. Moreover, in the case of incineration, there is a concern that various harmful substances and carbon dioxide may be discharged in large quantities, which may cause problems such as environmental pollution and global warming.

  Therefore, in recent years, attempts have been made to apply biodegradable polymer components instead of applying the polymer components such as the epoxy resin (for example, Patent Documents 2 and 3).

  In addition, although it is a technical field different from the above-described voltage device or the like, an attempt is made to apply a composition obtained by curing a material containing a plant-derived polymer component (for example, applied to a printed wiring board) ( For example, Patent Document 4), for example, it is known that sufficient mechanical properties can be obtained when used in a room temperature atmosphere.

In terms of reuse, it is known to apply lime ash (fly ash or the like) as a filler in the technical field of roads, building materials, and the like (for example, Non-Patent Document 1).
Japanese Patent No. 3359410 JP 2004-171799 A JP 2002-358829 A JP 2002-53699 A “COAL ASH widely used as a resource”, pamphlet, Japan Fly Ash Association, April 2004.

  However, as described above, an insulating product to which a biodegradable polymer component is applied is relatively easy to melt (for example, melt at a temperature of about 100 ° C.). When applied to voltage equipment (voltage equipment that can rise in temperature to about 100 ° C. during use), safety may be reduced (for example, insulation may be reduced). In addition, as the additive in the case of applying the above-described polymer component having biodegradability, a petroleum-derived one has been generally applied.

  Insulating products using aldehydes as curing agents have high mechanical properties in a temperature atmosphere of about room temperature (for example, the temperature environment in a printed wiring board), but in a high temperature atmosphere (for example, high voltage equipment) However, there is a risk that sufficient mechanical properties may not be obtained.

  As described above, it is required to obtain sufficient physical properties and safety in voltage devices and to contribute to global environmental conservation.

  The present invention is intended to solve the above-mentioned problems, and provides an insulating composition for voltage equipment that can obtain sufficient physical properties and safety in voltage equipment and contribute to global environmental conservation. is there.

  Specifically, the invention according to claim 1 is an insulating composition for a voltage device used for an insulation structure of a voltage device, and for an epoxy resin, an acid anhydride and a coal ash as a curing agent and an inorganic filler, respectively. The kneaded material is three-dimensionally cross-linked by heat treatment.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the coal ash is fly ash.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, 91 wt% or less of the coal ash is blended.

  The invention described in claim 4 is characterized in that, in the invention described in claims 1-3, the kneaded product is blended with a silane coupling agent.

  In the insulating composition having a three-dimensional cross-linking structure as in the inventions according to claims 1 to 4, a polymer component having biodegradability can be used without consuming new production energy or generating carbon dioxide in the filler. It does not melt like applied insulating products.

  In invention of Claim 3, the composition of a desired shape becomes easy to be obtained.

  In the invention of claim 4, the affinity of each component of the kneaded product is enhanced.

  As described above, according to the first to fourth aspects of the present invention, sufficient physical properties (electrical properties, mechanical properties, etc.) and safety as an insulating product applied to voltage equipment can be obtained, and also for the preservation of the global environment. Can contribute.

  Further, according to the invention described in claim 3, defects such as molding defects can be suppressed, and the yield is improved.

  Furthermore, according to the invention of claim 4, the physical properties are further improved.

  Hereinafter, the insulating composition for voltage devices in the embodiment of the present invention will be described in detail.

  In the present embodiment, attention is paid to the fact that in the insulating material applied to the voltage device, the most blended material by volume ratio and weight ratio is not a polymer component but an inorganic filler. In general insulation materials for voltage devices, either silica or alumina is selected as an inorganic filler (inorganic filler that is not a recycled product), and the linear expansion coefficient of inserts embedded in insulating products In consideration of heat dissipation characteristics and the like, for example, it is applied in a range of at least 40 vol% or more (70 vol% or more as required), but there has been no attempt to apply recycled products to these inorganic fillers.

  That is, in this embodiment, an epoxy resin is applied as a polymer component, and coal ash generated as a by-product such as a thermal power plant is applied to the inorganic filler (coal ash is reused). It has been found that good electrical and mechanical properties can be obtained and that it can contribute to global environmental conservation. By applying this coal ash, no new production energy is consumed in the filler, and no carbon dioxide is generated.

  As the curing agent, for example, amines, acid anhydrides, phenols, imidazoles and the like that can react with an epoxy resin can be applied, and naturally derived ones such as castor oil-based polyols can also be applied.

  The amount of the curing agent is calculated by, for example, calculating the epoxy equivalent of the epoxy resin and adding a stoichiometric amount based on the epoxy equivalent (for example, adding 1.0 as the stoichiometric ratio). The blending ratio of such a curing agent can be appropriately set depending on, for example, the priority order of physical properties required for the target polymer product.

  In addition to the epoxy resin, inorganic filler, and curing agent described above, for example, improvement of workability (for example, shortening of work time, etc.), improvement of moldability, Tg characteristics, mechanical / physical physical properties, electrical physical properties, etc. For the purpose, various additives can be used as appropriate, for example, curing accelerators (starting point of curing of the curing agent; for example, organic peroxides, amines, imidazoles, etc.), reaction inhibitors, reaction aids (reactions) The purpose of controlling (Tg characteristics); peroxide, etc.) can be used in combination as appropriate.

  As a specific example, when fly ash is applied as the inorganic filler, the fly ash is an admixture mainly composed of silica, alumina, etc., and therefore, for the purpose of improving the affinity of each component, a silane cup It is preferable to add a ring agent (for example, by an integral blend method).

  If peroxide is added to a polymer component, etc., the kneaded product will increase in viscosity over time, and productivity may be reduced (for example, kneadability and moldability may be reduced). If the working time (pot life) is, for example, 60 minutes or more, it can be regarded as having good productivity.

  Crosslinking in the insulating composition of the present embodiment is essentially due to the curing agent, and the crosslinking structure is affected by the curing conditions and the presence or absence of the curing accelerator, reaction inhibitor, reaction aid, etc. There is no.

  For example, the curing conditions (temperature, time, etc.) are appropriately set (for example, appropriately set according to the type and blending amount of the curing accelerator) in order to obtain the desired physical properties of the insulating composition. Even if the curing conditions are different, there is no great difference in the physical properties themselves. Moreover, the reaction accelerator and reaction inhibitor are appropriately applied for the purpose of improving the workability and productivity by increasing the reactivity or making it safe (suppressed). Even if the kind and blending amount are different, there is no great difference in the physical properties themselves. Further, the reaction aid is appropriately applied to adjust the reactivity (for example, adjustment of Tg characteristics in the case of peroxide) in the same manner as the reaction accelerator and reaction inhibitor (for example, curing conditions and acceleration of curing). This is applied as appropriate according to the type and blending amount of the agent and the like, and even if the kind and blending amount of the reaction aid is different, there is no significant difference in the physical properties themselves.

[Example]
Next, examples of the insulating composition for voltage equipment in the present embodiment will be described.

  In this example, first, an acid anhydride (HN2200 (acid anhydride) manufactured by Hitachi Chemical Co., Ltd.) was used as a curing agent for 100 phr of an epoxy resin (828 (epoxy equivalent 190) manufactured by Japan Epoxy Resin Co., Ltd.), which is a polymer component. Equivalent 170)) Stoichiometric amount (89 phr with respect to 100 phr of epoxy resin in this example), 1 phr of imidazole (2E4MZ manufactured by Shikoku Kasei Co., Ltd.) as a curing accelerator, and further as shown in Tables 1 to 3 below And fly ash as inorganic filler (JIS A6201-1999 type I, type II, type III; hereinafter referred to as fly ash I, II, III) 300 phr to 2000 phr and kneaded (kneaded under conditions according to the amount added) By doing this, kneaded material S1-S48 was obtained.

  Use the same polymer components, curing agents, and curing accelerators as those of the kneaded materials S1 to S50, and use 500 phr of silica (MCF-4 manufactured by Tatsumori) instead of fly ash I to III as an inorganic filler. Thus, kneaded materials S49 and S50 were obtained.

  In addition, the kneaded materials S1 to S50 of this example contain a silane coupling agent (KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd.) in addition to the polymer component, curing agent, curing accelerator, and inorganic filler ( It is assumed that it is blended by the integral blend method).

  And in said kneaded material S1-S50, after carrying out heat processing (three-dimensional bridge | crosslinking) on various hardening conditions (temperature, time) after mold casting and a defoaming process, each sample of an insulating composition ( A 1 mm × 250 mm × 250 mm flat plate sample and a 5 mm × 10 mm × 200 mm columnar sample) were prepared, and the electrical physical breakdown electric field in oil (the breakdown electric field in the flat plate sample) and the mechanical physical property at room temperature (20 C.) The bending strength (bending strength in a columnar sample) in an atmosphere was measured, and the measurement results are shown in Tables 1 to 3 below.

  As shown in Tables 1 to 3, the insulating composition in the case of using the kneaded materials S1 to S48 blended with fly ash as the inorganic filler is the kneaded materials S49 and S50 blended with silica as the inorganic filler. It was possible to obtain sufficiently good electrical and mechanical properties that were almost the same as when used. In particular, when a kneaded material containing a silane coupling agent was used, electrical and mechanical properties sufficiently higher than when a kneaded material not containing the silane coupling agent was used were obtained. This is because the insulating materials such as the kneaded materials S1 to S48 are modified by the silane coupling agent (the affinity of each component in the insulating material is improved), and various insulating compositions made of the insulating material are used. It can be seen that the physical properties have improved.

  In addition, when there are too many ratios of the inorganic filler with respect to a high molecular component, there exists a possibility that desired insulating composition may not be obtained like kneaded material S15 and S16, but the mixture ratio of the inorganic filler in an insulating material is. If it is about 91 wt% or less, for example, the kind of the inorganic filler is appropriately selected (for example, fly ash II, III or the like is applied in place of fly ash I in the kneaded materials S15, S16) to obtain a desired It can be read that there is a possibility that an insulating composition can be formed.

  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.

  For example, kneading conditions and heat treatment conditions in a kneaded material in which an inorganic filler or the like is blended with a polymer component (epoxy resin) depend on the type and blending amount of the polymer component, inorganic filler, and other various additives. However, the present invention is not limited to the contents shown in this embodiment. In addition to the above-mentioned polymer component, inorganic filler, etc., various additives (for example, additives other than Examples) are appropriately blended within a range that does not impair the properties of the target insulating composition. Even in this case, it is apparent that the same effects as those shown in this embodiment can be obtained.

Claims (4)

Used for the insulation structure of voltage equipment,
Consists of a kneaded material in which acid anhydride and coal ash are blended as curing agent and inorganic filler respectively for epoxy resin,
An insulating composition for voltage devices, wherein the kneaded product is three-dimensionally crosslinked by heat treatment.   The insulating composition for voltage equipment according to claim 1, wherein the coal ash is fly ash.   The insulating composition for voltage equipment according to claim 1, wherein the coal ash is blended in an amount of 91 wt% or less.   The said kneaded material mix | blended the silane coupling agent, The insulating composition for voltage devices in any one of Claims 1-3 characterized by the above-mentioned.