JP2000100627A - Method for mending leakage oil part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain emergency mending for leakage oil by strongly adhering adhesive to the surface of a substrate, following-up even expansion and contraction due to air temperature, and absorbing leakage insulating oil by mending a leakage oil part by using silicone elastomer adhesive, especially, a room temperature hardening organopolysiloxane composition. SOLUTION: A leakage part is mended by applying silicone elastomer adhesive to the oil leakage part of an equipment. It is desired that a room temperature hardening organopolysiloxane composition, especially, condensation system room temperature hardening organopolysiloxane composition containing oil absorbent carbon powder is used for silicone elastomer adhesive. A butyl tape which can swell by absorbing insulating oil is wound around the oil leakage part of an equipment, and then the silicone elastomer adhesive is applied and adhered to this oil leakage part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plant such as a power company, a substation and other high-voltage transformers, circuit breakers, and other devices that use an electrical insulating oil to reduce the oil leakage portion at low cost. The present invention relates to a method for repairing an oil leak portion that can be repaired well.

[0002]

2. Description of the Related Art Some substations of electric power companies are filled with a large amount of insulating oil, such as circuit breakers and transformers. It is said that such devices have a service life of about 30 years. However, packing such as NBR made of synthetic rubber for joint joints is required under environmental conditions (weather resistance, heat resistance, cold resistance, ultraviolet resistance, etc.). ), It often deteriorates in about 20 years and oil leakage starts. In order to repair this oil leak, each electric power company had to perform a process of causing a power outage, extracting the inside insulating oil, lifting the lid with a crane, and then replacing the packing and repairing it. However, for such repairs, it is necessary to move a crane truck to the mountain, report to a road-related office, apply for a fire department, contact a power outage destination, etc. However, if it is a little big, it costs about 60 million yen.

[0003] Therefore, as a simple repair work, an epoxy resin, an inorganic seal adhesive or the like is often used to temporarily overcome the problem. However, such a hard seal adhesive has a large daily difference in direct sunlight. By the way, cracks are immediately formed and oil leakage starts again in one to two weeks. It is also considered to use a rubber-like flexible material after curing as an adhesive, but even if it is repaired with such a material, if it does not have adhesiveness to the oil surface, it will propagate along the interface. And oil leakage starts.

As described above, the leakage of the insulating oil is often caused by deterioration of the packing material with the passage of the year, and replacement of the packing requires enormous cost and several days of power failure. It was an expensive operation. Even if an epoxy adhesive or an inorganic adhesive sealant is used without changing the packing, these cured products are hard and the surrounding pipes and tanks made of metal have a large extension and shrinkage. The oil could not follow the movement of the crack and leaked again in a short time. Furthermore, even if a rubbery flexible material is used after curing, if it does not have adhesiveness to the oil surface, it will be transmitted along the interface and oil leakage will start, so it cannot be repaired satisfactorily in any case. That was the current situation. Therefore, there has been a demand for the development of a new technique for repairing oil leakage that can solve such disadvantages.

SUMMARY OF THE INVENTION The present invention has been made in order to meet the above-mentioned demands, and has as its object to provide a method for repairing an oil leakage portion which can easily and efficiently repair oil leakage at an oil leakage portion of equipment. .

[0006]

Means for Solving the Problems and Embodiments of the Invention The present inventors have made intensive studies to achieve the above object, and as a result, by applying a silicone-based elastomer adhesive to an oil leak portion of a device, It has been found that oil spills can be repaired industrially advantageously with a very simple process and at low cost.

That is, the present inventor has reported that silicone-based elastomer adhesives, especially room-temperature-curable organopolysiloxane compositions, particularly condensation-type room-temperature-curable organopolysiloxane compositions containing oil-absorbing carbon powder, are used as insulating oils. Even if oil leakage exists, it has excellent oil surface adhesion, and cures quickly at room temperature to give a cured product with weather resistance, heat resistance, cold resistance, and flexibility. It has been found that the use of an agent allows the leaked portion to be sealed with good adhesiveness to reliably prevent and repair oil leakage.

Further, a butyl rubber tape capable of absorbing and swelling the insulating oil is wrapped around the oil leaking part of the equipment, and then a silicone elastomer adhesive is applied and adhered to absorb the leaking insulating oil. In addition, it adheres firmly to the substrate surface, follows expansion and contraction due to air temperature, and it is possible to more reliably perform emergency treatment for oil leakage,
The present inventor has found that it is a very effective repair method in terms of time and cost, and has accomplished the present invention.

Accordingly, the present invention provides the following repair method. (1) A method for repairing an oil leak portion, which comprises applying a silicone elastomer adhesive to an oil leak portion of a device to repair the leak portion. (2) The method for repairing an oil-leak portion in which the silicone-based elastomer adhesive is a room-temperature-curable organopolysiloxane composition. (3) The method for repairing an oil-leak portion in which the silicone-based elastomer adhesive is a condensed room-temperature-curable organopolysiloxane composition containing oil-absorbing carbon powder. (4) A method for repairing the above oil leaking part where the oil leaking part of the equipment is a deteriorated part of the packing of the transformer flange part. (5) A method for repairing the above oil leaking part where the oil leaking part of the equipment is a deteriorated part of the packing of the oil breaker. (6) The above-described method for repairing an oil leak portion in which a butyl tape capable of absorbing insulating oil and swelling is wound around an oil leak portion of the device, and then a silicone-based elastomer adhesive is applied.

Hereinafter, the present invention will be described in more detail. A method for repairing an oil leak portion of the present invention is characterized in that a silicone elastomer adhesive is applied to an oil leak portion of a device to repair the leak portion. Things.

Here, the method of the present invention is applicable to various devices, particularly to devices using electric insulating oil. There are various types of such devices, for example, high-voltage transformers, such as power plants and substations of electric power companies, circuit breakers, capacitors, and capacitors. Examples of the oil leak portion of these devices include a transformer flange portion and a packing portion of an oil circuit breaker.

In the present invention, a room temperature-curable organopolysiloxane composition, particularly a condensed room temperature-curable organopolysiloxane composition containing oil-absorbing carbon powder, is preferably used as the silicone-based elastomer adhesive. .

Further, as a specific example, a room temperature curable organopolysiloxane composition is disclosed in JP-A-8-17644.
A room-temperature-curable organopolysiloxane composition having the following composition and excellent in oil-surface adhesion described in JP-A-5 No. 5 is preferably used. (A) a diorganopolysiloxane having hydroxyl groups at both molecular chain terminals and having a viscosity at 25 ° C. of 25 to 100,000 cSt; (B) an oxime silane represented by the following general formula (1) or (2); Partial hydrolysis-condensation products or mixtures thereof

[0014]

Embedded image(Where R¹Is one of unsubstituted or substituted C 1-10
Valent hydrocarbon group, R^TwoAnd R ^ThreeAre the same or different
Often, a hydrogen atom or unsubstituted or substituted carbon number 1-1
0 monovalent hydrocarbon group, R^FourHas two or more carbon atoms,
2 to 5 unsubstituted or substituted divalent hydrocarbon groups, n is 3 or
Is 4. (C) Organotin catalyst (D) Average particle size 60 nm or less, BET specific surface area 30 m^Two
/ G or more and DBP oil absorption (JIS K 622)
Oil-absorbing carbon powder wherein 1) is 80 ml / 100 g or more (E) silane-modified polyoxyalkylene or polyether
Low-modified polysiloxane or polyether compounds
Olga containing at least one kind and having excellent oil-surface adhesion
Nopolysiloxane composition.

In the present invention, there is no particular limitation on the method of applying a silicone elastomer adhesive to the oil leaking part of the device to repair the oil leaking at the leaking part. For example, the following method can be adopted.

That is, first, if necessary, the oil in the oil leaking part of the equipment is wiped off using a solvent or a waste cloth, or washed to confirm the leaking part. The fusion tape is wrapped around and then a silicone elastomer adhesive is applied and cured.

Here, the application conditions of the silicone-based elastomer adhesive can be appropriately adjusted, but it is preferable to improve the wettability with the adherend by applying a thickness of about 2 to 15 mm and pressing the spatula or the like. Furthermore, in the case of sealing with a thickness of 5 mm or more, double-sealing is performed by performing primary sealing at 2 to 5 mm, hardening the surface, then applying thick coating to 5 to 15 mm to suppress internal pressure and performing secondary sealing. A processing method is desirable.

The curing condition of the silicone-based elastomer adhesive can be set according to the kind of the adhesive to be used, but it is usually moisture-cured at room temperature.

In this case, it is preferable that a self-sealing tape of butyl rubber capable of absorbing insulating oil and swelling is wrapped around the oil leakage point of the device, and then a silicone elastomer adhesive is applied and bonded. The self-adhesive tape of butyl rubber acts to suppress the internal pressure of oil and has an oil adsorption (oil swelling) effect. It absorbs insulating oil and swells itself. Since it is possible to absorb the oil and also to prevent the three-sided adhesion of the sealing material, it is possible to more suitably repair the oil leakage.

[0020]

The method for repairing an oil-leak portion according to the present invention is directed to a method for repairing an oil-leak portion using a silicone-based elastomer adhesive, particularly an organopolysiloxane composition curable at room temperature. It adheres firmly, follows expansion and contraction due to temperature, absorbs leaking insulating oil, enables emergency repair of oil leakage, and is extremely effective in terms of time and cost. is there.

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[Examples and Comparative Examples] Oil leakage points of a 66KV transformer were repaired by the following method. Work procedure: (1) Wipe off the oil from the insulating oil leaks with a waste cloth. (2) A solvent (solvent volatile oil: normal-hexane main component) is contained in the waste cloth and the leaked oil is wiped off. Thoroughly wipe the inner and outer surfaces of the flange and around the bolts. (3) The brush is soaked with a solvent, and a portion that cannot be wiped with a waste cloth (a joint portion under the bolt, etc.) is washed. (4) Visually check for oil leaks. (5) Primer C (pretreatment agent for RTV manufactured by Shin-Etsu Chemical Co., Ltd.) is applied to the entire surface using a brush. (6) Wrap the self-fusing tape of butyl rubber over the mounting portion of the gasket that may leak and press down. this is,
It aims at the effect of temporarily giving the oil by butyl rubber and the effect of oil adsorption (oil swelling) of the butyl rubber. The butyl rubber tape also serves to prevent three-sided adhesion of the sealing material. (7) Using a carbon-based silicone RTV adhesive having the following composition, a butyl tape and a flange surface were pressed and sealed to a thickness of 3 to 5 mm. Adhesive composition: 100 parts by weight of α, ω-dihydroxydimethylpolysiloxane One part by weight butoxy-blocked ethylene oxide propylene oxide copolymer 1.0 part by weight Acetylene black (average particle diameter 40 μm, DOP oil absorption 180 ml, BET ratio table area 58 m ² / g 30 parts by weight Fumed silica 3.0 parts by weight Methyltrioximesilane 5.0 parts by weight Vinyltrioximesilane 4.0 parts by weight Dibutoxydioctyltin 0.1 part by weight γ-aminopropyltriethoxysilane 1.0 part by weight Part (8) The above adhesive was applied to a thickness of about 8 mm as a whole, and a spatula was pressed from above to improve the adhesion at the interface (the spatula press improves the wettability with the adherend). (9) After being left to cure for about 20 minutes, it was confirmed that the surface was rubberized and the periphery was adhered, and then the above-mentioned adhesive was filled up to the flange surface to adjust the appearance, thereby giving pressure resistance. (10) As a precaution, the above-mentioned adhesive was applied and sealed also on the head of the bolt penetrating the flange.

The properties of the adhesive before and after curing are as shown in Table 1.

In the transformer repaired using the above-mentioned adhesive, the cured product of this adhesive adhered well to the oil surface, there was no quality deterioration, and there was no re-leakage at the leaked part even after one year. .

[0025]

[Table 1]

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Claims (6)

[Claims] 1. A method for repairing an oil leak portion, which comprises applying a silicone elastomer adhesive to an oil leak portion of a device to repair the leak portion. 2. The silicone elastomer adhesive according to claim 1, which is an organopolysiloxane composition curable at room temperature.
Repair method for oil leaks described. 3. The method according to claim 1, wherein the silicone elastomer adhesive is a condensed room temperature curable organopolysiloxane composition containing oil-absorbing carbon powder. 4. The method for repairing an oil leak portion according to claim 1, wherein the oil leak portion of the device is a deteriorated portion of the packing of the transformer flange portion. 5. The method for repairing an oil leak portion according to claim 1, wherein the oil leak portion of the device is a deteriorated portion of the packing of the oil circuit breaker. 6. The leak according to claim 1, wherein a butyl rubber tape capable of absorbing insulating oil and swelling is wound into an oil leak portion of the device, and then a silicone elastomer adhesive is applied. How to repair the oil part.