JP2010027676A - Composite film for conservator of oil-immersed transformer - Google Patents

Composite film for conservator of oil-immersed transformer Download PDF

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JP2010027676A
JP2010027676A JP2008183963A JP2008183963A JP2010027676A JP 2010027676 A JP2010027676 A JP 2010027676A JP 2008183963 A JP2008183963 A JP 2008183963A JP 2008183963 A JP2008183963 A JP 2008183963A JP 2010027676 A JP2010027676 A JP 2010027676A
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oil
filled transformer
composite film
pva
nylon cloth
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JP5369521B2 (en
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Akihiro Koike
晃広 小池
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Tokyo Electric Power Company Holdings Inc
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Tokyo Electric Power Co Inc
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<P>PROBLEM TO BE SOLVED: To provide a composite film for a conservator of an oil-immersed transformer having a high peel strength between an intermediate layer composed of EVOH film or the like and a nylon cloth layer. <P>SOLUTION: This composite film 10 for a conservator used in an oil-immersed transformer has a structure in which a nylon cloth layer 2 is bonded to both surfaces of an intermediate layer 2 composed of EVOH film or the like with an adhesive 4, and an outer layer 3 composed of a nitrile rubber or the like is bonded to the outer surface of each of nylon cloth layers 2. The adhesive 4 is an aqueous solution dissolving a polyvinyl alcohol resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、油入変圧器コンサベータ用複合膜に関し、特に、優れた接着性により層間の剥離強度が高い油入変圧器コンサベータ用複合膜に関する。   The present invention relates to a composite film for an oil-filled transformer conservator, and more particularly to a composite film for an oil-filled transformer conservator that has high peel strength due to excellent adhesion.

図2は、油入変圧器の構成例を示す。この油入変圧器100は、鉄心、一次巻線、および二次巻線等からなる変圧器本体11と、密閉構造を有すると共に変圧器本体11が内蔵されるタンク12と、絶縁耐力および冷却効果を上げるためにタンク12に封入される絶縁油13と、タンク12の天井面に取り付けられた複数の碍子14と、タンク12の上部に配設され、連結管15を介してタンク12に連結されたコンサベータ(Conservator)16と、連結管17を介してコンサベータ16に連結された吸湿呼吸器18とを備える。   FIG. 2 shows a configuration example of the oil-filled transformer. This oil-filled transformer 100 includes a transformer main body 11 including an iron core, a primary winding, a secondary winding, and the like, a tank 12 having a sealed structure and incorporating the transformer main body 11, and a dielectric strength and a cooling effect. Insulating oil 13 sealed in the tank 12, a plurality of insulators 14 attached to the ceiling surface of the tank 12, and an upper portion of the tank 12, and connected to the tank 12 via a connecting pipe 15. A conservator 16 and a hygroscopic respirator 18 connected to the conservator 16 via a connecting pipe 17 are provided.

変圧器本体11は、鉄心、一次巻線、および二次巻線等を備え、交流の入力電圧を降圧して出力する。タンク12は、放熱性に優れる金属を用いて、高い放熱性が得られ、かつ変圧器本体11との絶縁を考慮した構造に作られている。碍子14は、タンク12に絶縁させて取り付けられ、送電線や配電線と変圧器本体11の一次巻線および二次巻線に接続される。   The transformer body 11 includes an iron core, a primary winding, a secondary winding, and the like, and steps down and outputs an AC input voltage. The tank 12 is made of a metal that is excellent in heat dissipation, and has a structure in which high heat dissipation is obtained and insulation from the transformer body 11 is taken into consideration. The insulator 14 is attached to the tank 12 while being insulated, and is connected to the power transmission line, the distribution line, and the primary winding and the secondary winding of the transformer main body 11.

コンサベータ16は、内部に、油入変圧器100の絶縁油13と外気を分離して絶縁油13の酸化劣化を防止するとともに、絶縁油13の膨張および収縮を吸収するための耐油性の油入変圧器コンサベータ用複合膜(以下、コンサベータ用複合膜という)20が設けられている。   The conservator 16 internally separates the insulating oil 13 of the oil-filled transformer 100 from the outside air to prevent oxidative deterioration of the insulating oil 13 and to absorb the expansion and contraction of the insulating oil 13. An input transformer conservator composite film (hereinafter referred to as a conservator composite film) 20 is provided.

吸湿呼吸器18は、コンサベータ16に導入される空気を除湿するための乾燥剤、例えば、シリカゲルを収納している。   The hygroscopic respirator 18 contains a desiccant for dehumidifying the air introduced into the conservator 16, for example, silica gel.

図3は、コンサベータ用複合膜20の構成を示す。酸素ガスバリア性を向上したコンサベータ用複合膜は流動帯電対策のひとつとして、超高圧変圧器への適用が検討されており、図3のコンサベータ用複合膜20は特許文献1に開示されている。   FIG. 3 shows the structure of the composite membrane 20 for conservators. A composite membrane for conservators with improved oxygen gas barrier properties has been studied for application to an ultra-high voltage transformer as one of the countermeasures against flow electrification. The composite membrane for conservators 20 in FIG. .

このコンサベータ用複合膜20は、酸素ガスバリア性を備える酸化防止用の高分子材料を用いた中間層としてのEVOHフィルム21と、このEVOHフィルム21の両面にそれぞれ設けられた内層としてのナイロン布22と、ナイロン布22のそれぞれの表面に設けられた外層としてのニトリルゴム23とを備える。各層の相互間は接着されており、中間層と内層とは有機溶剤系ゴム糊やシリル基含有ポリマー等の接着剤24により接着されることが記載されている。   The composite membrane for conservator 20 includes an EVOH film 21 as an intermediate layer using an anti-oxidation polymer material having an oxygen gas barrier property, and a nylon cloth 22 as an inner layer provided on both surfaces of the EVOH film 21. And a nitrile rubber 23 as an outer layer provided on each surface of the nylon cloth 22. It is described that the layers are bonded to each other, and the intermediate layer and the inner layer are bonded by an adhesive 24 such as an organic solvent rubber paste or a silyl group-containing polymer.

変圧器本体11は、運転にともなって鉄心および各巻線の温度が上昇する。変圧器本体11の温度が上昇すると、絶縁油13の温度が上昇し、膨張する。また、変圧器本体11が運転を停止し、或いは軽負荷で動作するようになったときには、絶縁油13の温度が下がり、収縮する。この絶縁油13の膨張および収縮を吸収するためにコンサベータ16が設けられている。   In the transformer main body 11, the temperature of the iron core and each winding increases with operation. When the temperature of the transformer body 11 rises, the temperature of the insulating oil 13 rises and expands. In addition, when the transformer main body 11 stops operating or operates with a light load, the temperature of the insulating oil 13 decreases and contracts. A conservator 16 is provided to absorb the expansion and contraction of the insulating oil 13.

コンサベータ用複合膜20は、その片面に吸湿呼吸器18からの空気(酸素)が接触し、他方の面にタンク12からの絶縁油13が接触しており、タンク12内の絶縁油13の膨張または収縮に応じてコンサベータ用複合膜20が上下動し、絶縁油13の膨張/収縮を吸収する。   The conservator composite membrane 20 is in contact with the air (oxygen) from the hygroscopic respirator 18 on one side, and the insulating oil 13 from the tank 12 is in contact with the other side of the insulating membrane 13 in the tank 12. In response to the expansion or contraction, the conservator composite film 20 moves up and down to absorb the expansion / contraction of the insulating oil 13.

したがって、コンサベータ用複合膜20には、絶縁油13の劣化防止のため酸素ガスバリア性に優れていること、変形に対する追随性に優れていること、層間の剥離強度が高いこと等が要求される。
特開2006−237531号公報
Therefore, the composite membrane for conservator 20 is required to have excellent oxygen gas barrier properties for preventing deterioration of the insulating oil 13, excellent followability to deformation, and high delamination strength between layers. .
Japanese Patent Laid-Open No. 2006-237531

しかし、特許文献1記載のコンサベータ用複合膜20は、EVOHフィルム等からなる中間層と、ナイロン布からなる内層との間の剥離強度について、図3のように5層構造とした場合、即ち実機量産レベルの条件下において改善の余地が残されていた。   However, the composite membrane 20 for conservator described in Patent Document 1 has a five-layer structure as shown in FIG. 3 for the peel strength between the intermediate layer made of EVOH film or the like and the inner layer made of nylon cloth, that is, There was room for improvement under conditions of actual mass production level.

従って、本発明の目的は、EVOHフィルム等からなる中間層と、ナイロン布層との間の剥離強度が高い油入変圧器コンサベータ用複合膜を提供することにある。   Accordingly, an object of the present invention is to provide a composite membrane for an oil-filled transformer conservator having high peel strength between an intermediate layer made of an EVOH film or the like and a nylon cloth layer.

本発明は、上記目的を達成するため、酸素ガスバリア性を有する酸化防止用の高分子材料による中間層と、前記中間層の両面にそれぞれ設けられたナイロン布層と、前記ナイロン布層のそれぞれの外側表面(前記ナイロン布層対向面とは反対側の面)に設けられた耐油物質による外層とを備え、前記中間層と前記ナイロン布とは、ポリビニルアルコール樹脂を溶解した水溶液により接着されていることを特徴とする油入変圧器コンサベータ用複合膜を提供する。   In order to achieve the above object, the present invention provides an intermediate layer made of an anti-oxidant polymer material having an oxygen gas barrier property, a nylon cloth layer provided on both surfaces of the intermediate layer, and each of the nylon cloth layers. An outer layer made of an oil-resistant substance provided on the outer surface (the surface opposite to the nylon cloth layer facing surface), and the intermediate layer and the nylon cloth are bonded to each other with an aqueous solution in which a polyvinyl alcohol resin is dissolved. A composite membrane for oil-filled transformer conservators is provided.

本発明によれば、EVOHフィルム等からなる中間層と、ナイロン布層との間の剥離強度が高い油入変圧器コンサベータ用複合膜を提供できる。   ADVANTAGE OF THE INVENTION According to this invention, the composite film for oil-filled transformer conservators with high peeling strength between the intermediate | middle layer which consists of EVOH films etc., and a nylon cloth layer can be provided.

図1は、本発明の実施の形態に係る油入変圧器コンサベータ用複合膜を示す。この油入変圧器コンサベータ用複合膜(以下、コンサベータ用複合膜という)10は、酸素ガスバリア性を備える酸化防止用の高分子材料を用いた中間層1と、この中間層1の両面にそれぞれ設けられたナイロン布層2と、各ナイロン布層2のそれぞれの外側表面(即ち、中間層対向面とは反対側の面)に設けられたニトリルゴム等の耐油物質による外層3とを備え、各層の相互間は接着されている。   FIG. 1 shows a composite membrane for an oil-filled transformer conservator according to an embodiment of the present invention. This composite film for oil-filled transformer conservator (hereinafter referred to as “composite film for conservator”) 10 includes an intermediate layer 1 using an antioxidant polymer material having an oxygen gas barrier property, and both surfaces of the intermediate layer 1. Each provided nylon cloth layer 2 and an outer layer 3 made of an oil-resistant substance such as nitrile rubber provided on the outer surface of each nylon cloth layer 2 (that is, the surface opposite to the intermediate layer facing surface). The layers are bonded to each other.

〔中間層1〕
中間層1には、絶縁油の酸化防止用であり、酸素ガスバリア性に優れた高分子材料を用いる。具体的には、室温(20〜25℃)、湿度0%で酸素透過率が、3.5cm/m・24h・atm以下、50℃、湿度0%において30cm/m・24h・atm以下である高分子材料を好適に用いることができる。より好ましくは、室温(20〜25℃)、湿度0%で酸素透過率が、2.0cm/m・24h・atm以下、50℃、湿度0%において25cm/m・24h・atm以下である。さらに好ましくは、室温(20〜25℃)、湿度0%で酸素透過率が、1.0cm/m・24h・atm以下、50℃、湿度0%において21cm/m・24h・atm以下である。
[Intermediate layer 1]
The intermediate layer 1 is made of a polymer material for preventing oxidation of insulating oil and having an excellent oxygen gas barrier property. Specifically, the oxygen transmission rate is 3.5 cm 3 / m 2 · 24 h · atm or less at room temperature (20 to 25 ° C.) and a humidity of 0%, and 30 cm 3 / m 2 · 24 h · at 50 ° C. and a humidity of 0%. A polymer material having atm or less can be preferably used. More preferably, room temperature (20-25 ° C.), an oxygen permeability at 0% humidity, 2.0cm 3 / m 2 · 24h · atm or less, 50 ℃, 25cm 3 / m 2 · 24h · atm at 0% humidity It is as follows. More preferably, the oxygen permeability is 1.0 cm 3 / m 2 · 24 h · atm or less at room temperature (20 to 25 ° C.) and humidity 0%, and 21 cm 3 / m 2 · 24 h · atm at 50 ° C. and humidity 0%. It is as follows.

また、中間層1は、より好ましくは以下の条件も満たす高分子材料を用いる。すなわち、35℃、湿度75%で酸素透過率が、6.0cm/m・24h・atm以下、より好ましくは、5.0cm/m・24h・atm以下、さらに好ましくは、4.0cm/m・24h・atm以下である。 The intermediate layer 1 is more preferably made of a polymer material that also satisfies the following conditions. That is, at 35 ° C. and a humidity of 75%, the oxygen transmission rate is 6.0 cm 3 / m 2 · 24 h · atm or less, more preferably 5.0 cm 3 / m 2 · 24 h · atm or less, and still more preferably 4. 0 cm 3 / m 2 · 24 h · atm or less.

また、水分の透過を防止することが望ましいことから、中間層1は、さらに好ましくは以下の条件も満たす高分子材料を用いる。すなわち、室温(20〜25℃)における水蒸気透過率が、1000g/m・24h以下、50℃において5000g/m・24h以下である。より好ましくは、室温(20〜25℃)における水蒸気透過率が、950g/m・24h以下、50℃において5000g/m・24h以下である。 Moreover, since it is desirable to prevent the permeation | transmission of a water | moisture content, the intermediate | middle layer 1 uses the polymeric material which satisfy | fills the following conditions more preferably. That is, the water vapor transmission rate at room temperature (20 to 25 ° C.) is 1000 g / m 2 · 24 h or less, and at 50 ° C. is 5000 g / m 2 · 24 h or less. More preferably, the water vapor transmission rate at room temperature (20 to 25 ° C.) is 950 g / m 2 · 24 h or less and at 50 ° C. is 5000 g / m 2 · 24 h or less.

このような中間層1として、例えば、エチレン−ビニルアルコール共重合体樹脂(EVOH)、延伸ポリビニルアルコール(延伸PVA)、ポリ塩化ビニリデン(PVDC)等のフィルムを好適に用いることができる。特に、延伸ポリビニルアルコール(延伸PVA)が好ましい。   As such an intermediate layer 1, for example, a film of ethylene-vinyl alcohol copolymer resin (EVOH), stretched polyvinyl alcohol (stretched PVA), polyvinylidene chloride (PVDC), or the like can be suitably used. In particular, stretched polyvinyl alcohol (stretched PVA) is preferred.

中間層1として、エチレン−ビニルアルコール共重合体樹脂(EVOH)を用いる場合には、エチレン共重合比率が20〜45mol%のものを用いることが好ましく、より好ましくは、25〜35mol%であり、さらに好ましくは、29〜31mol%である。   When using an ethylene-vinyl alcohol copolymer resin (EVOH) as the intermediate layer 1, it is preferable to use one having an ethylene copolymerization ratio of 20 to 45 mol%, more preferably 25 to 35 mol%, More preferably, it is 29-31 mol%.

EVOHの厚みは、10〜30μmが好ましく、より好ましくは12〜25μmであり、さらに好ましくは14〜20μmである。   As for the thickness of EVOH, 10-30 micrometers is preferable, More preferably, it is 12-25 micrometers, More preferably, it is 14-20 micrometers.

中間層1として、延伸ポリビニルアルコール(延伸PVA)を用いる場合には、二軸延伸PVAを用いることが好ましい。また、延伸PVAは、耐水蒸気透過に優れているとは言えないため、乾燥剤等を併用することが好ましい。   When using stretched polyvinyl alcohol (stretched PVA) as the intermediate layer 1, it is preferable to use biaxially stretched PVA. Moreover, since it cannot be said that stretched PVA is excellent in water vapor | steam resistance, it is preferable to use a desiccant etc. together.

延伸PVAの厚みは、8〜30μmが好ましく、より好ましくは10〜25μmである。   As for the thickness of extending | stretching PVA, 8-30 micrometers is preferable, More preferably, it is 10-25 micrometers.

中間層1として、ポリ塩化ビニリデン(PVDC)を用いる場合には、厚めのフィルムを使用するか、複数層貼り合わせて使用するか、強度の点からほかの材料を張り合わせて使用することが好ましい。   When polyvinylidene chloride (PVDC) is used as the intermediate layer 1, it is preferable to use a thicker film, a plurality of laminated layers, or a laminate of other materials from the viewpoint of strength.

PVDCの厚みは、14〜55(27ミクロン×2枚を想定)μmが好ましく、より好ましくは18〜40μmであり、さらに好ましくは20〜35μmである。   The thickness of PVDC is preferably 14 to 55 (assuming 27 microns × 2 sheets) μm, more preferably 18 to 40 μm, and still more preferably 20 to 35 μm.

〔ナイロン布層2〕
ナイロン布層2は、補強材として機能する。ナイロン布層2の厚みは、70〜150μmが好ましく、より好ましくは80〜140μmであり、さらに好ましくは90〜130μmである。
[Nylon cloth layer 2]
The nylon cloth layer 2 functions as a reinforcing material. 70-150 micrometers is preferable, as for the thickness of the nylon cloth layer 2, More preferably, it is 80-140 micrometers, More preferably, it is 90-130 micrometers.

〔外層3〕
外層3には、ニトリルゴム等の耐油物質を好適に用いることができる。外層5の厚みは、150〜400μmが好ましく、より好ましくは200〜400μmであり、さらに好ましくは250〜350μmである。
[Outer layer 3]
For the outer layer 3, an oil resistant material such as nitrile rubber can be suitably used. 150-400 micrometers is preferable, as for the thickness of the outer layer 5, More preferably, it is 200-400 micrometers, More preferably, it is 250-350 micrometers.

〔中間層1とナイロン布層2の接着〕
中間層1とナイロン布層2とは接着剤4により接着されている。接着剤4としては、ポリビニルアルコール樹脂(PVA)を溶解した水溶液(以下、PVA水溶液という)が用いられる。
[Adhesion of intermediate layer 1 and nylon cloth layer 2]
The intermediate layer 1 and the nylon cloth layer 2 are bonded by an adhesive 4. As the adhesive 4, an aqueous solution in which polyvinyl alcohol resin (PVA) is dissolved (hereinafter referred to as PVA aqueous solution) is used.

使用するPVAは、分子量3000〜96000であることが好ましい。分子量が3000より小さいと、接着に必要な網目構造が形成されず十分な接着強度を確保しにくくなり、分子量が96000より大きいと、水への溶解性が低くなり均一な溶液を得ることができにくくなる。より好ましくは、分子量8000〜12000である。   The PVA to be used preferably has a molecular weight of 3000 to 96000. If the molecular weight is less than 3000, a network structure necessary for adhesion is not formed, and it becomes difficult to secure sufficient adhesive strength. If the molecular weight is more than 96000, the solubility in water is lowered and a uniform solution can be obtained. It becomes difficult. More preferably, the molecular weight is 8000 to 12000.

また、使用するPVAは、水に溶解するものであればよく、けん化度98モル%以上となると溶解し難くなるため98モル%未満のものが好ましい。けん化度78〜95モル%がより好ましく、85〜92モル%がさらに好ましい。   Moreover, the PVA to be used should just be what melt | dissolves in water, and since it becomes difficult to melt | dissolve when saponification degree becomes 98 mol% or more, the thing below 98 mol% is preferable. The saponification degree is more preferably 78 to 95 mol%, further preferably 85 to 92 mol%.

PVA水溶液は、PVAの濃度が8〜30質量%であることが好ましい。PVAの濃度が8質量%よりも小さいと、接着に必要な水酸基の濃度が不足して十分な接着強度を確保しにくくなり、PVA濃度が30質量%よりも大きいと、PVAを均一に溶解させた水溶液が得られにくくなる。より好ましくは、10〜15質量%である。   The PVA aqueous solution preferably has a PVA concentration of 8 to 30% by mass. If the concentration of PVA is less than 8% by mass, the concentration of hydroxyl groups necessary for adhesion is insufficient, making it difficult to ensure sufficient adhesive strength. If the PVA concentration is greater than 30% by mass, PVA is uniformly dissolved. It is difficult to obtain an aqueous solution. More preferably, it is 10-15 mass%.

上記PVAを用いることで、また上記濃度範囲にすることで、PVAが均一溶解したPVA水溶液を得易い。更に、水に70〜80℃にしてPVAを溶解することで、より均一でより高濃度にPVA水溶液を作製することができる。   By using the above PVA and by setting the concentration within the above range, it is easy to obtain a PVA aqueous solution in which PVA is uniformly dissolved. Furthermore, by dissolving PVA at 70 to 80 ° C. in water, a more uniform and higher concentration PVA aqueous solution can be prepared.

接着剤4としては、上記PVA水溶液中にPVAに加えて更に、水中で前記ポリビニルアルコール樹脂の水酸基と反応することができる硬化剤を溶解或いは分散させたものも好適に用いることができる。PVAと化学的架橋を形成することでより優れた長期耐久性が期待できる。   As the adhesive 4, a solution obtained by dissolving or dispersing a curing agent capable of reacting with a hydroxyl group of the polyvinyl alcohol resin in water in addition to PVA in the PVA aqueous solution can also be suitably used. More excellent long-term durability can be expected by forming a chemical crosslink with PVA.

当該硬化剤としては、水分散性ポリイソシアネート化合物を用いることが好ましい。特に、水分散後8時間経過してもイソシアネート基の90%以上が水と反応せずに残っているもの、或いは水分散後10時間経過してもイソシアネート基の80%以上(好ましくは85%以上)が水と反応せずに残っているものが好ましい。   It is preferable to use a water-dispersible polyisocyanate compound as the curing agent. In particular, 90% or more of the isocyanate groups remain unreacted with water even after 8 hours have passed after water dispersion, or 80% or more (preferably 85%) of isocyanate groups even after 10 hours have passed after water dispersion. The above is preferably left unreacted with water.

水分散性ポリイソシアネート化合物は、例えば、ポリイソシアネートと共に、親水性基(水中で外側に配向)と疎水性基(水中で内側に配向)とを有する分散剤を使用することで得ることができる。また、市販されているものでもよく、例えば、製品名:バーノック(登録商標)DNW−5000(大日本インキ化学工業株式会社製)を好適に使用できる。   The water-dispersible polyisocyanate compound can be obtained by using, for example, a dispersant having a hydrophilic group (oriented outward in water) and a hydrophobic group (oriented inside in water) together with polyisocyanate. Moreover, what is marketed may be used, for example, product name: Burnock (trademark) DNW-5000 (made by Dainippon Ink & Chemicals, Inc.) can be used conveniently.

また、当該硬化剤としては、一液水性反応硬化ウレタン樹脂を用いることが好ましい。例えば、関西ペイント(株)製の製品名:アクアレタン(アレスアクアレタン)を好適に使用できる。   Moreover, as the said hardening | curing agent, it is preferable to use 1 liquid aqueous reaction hardening urethane resin. For example, the product name: Aquaretan manufactured by Kansai Paint Co., Ltd. can be suitably used.

また、当該硬化剤としては、水性ビニルウレタン架橋剤を用いることが好ましい。例えば、アイカ工業製の製品名:AUH−1や光洋産業製の製品名:AJ−1(イソシアネート系木材接着剤)を好適に使用できる。   Moreover, as the said hardening | curing agent, it is preferable to use an aqueous vinyl urethane crosslinking agent. For example, the product name: AUH-1 manufactured by Aika Industry or the product name: AJ-1 (isocyanate wood adhesive) manufactured by Koyo Sangyo Co., Ltd. can be suitably used.

PVA水溶液におけるPVAと硬化剤の質量比は、PVA:硬化剤=100:0.1〜100:200が好ましく、100:0.5〜100:50がより好ましい。PVAを100とした場合の硬化剤の質量比が0.5より小さいと、PVAと十分な化学的架橋を形成できなくなり、同質量比が200よりと大きいと均一溶液が得られにくくなる。さらに好ましくは、100:0.5〜100:30であり、最も好ましくは、100:0.5〜100:10の質量比である。   The mass ratio of PVA and curing agent in the PVA aqueous solution is preferably PVA: curing agent = 100: 0.1 to 100: 200, and more preferably 100: 0.5 to 100: 50. When the mass ratio of the curing agent when PVA is 100 is smaller than 0.5, it becomes impossible to form sufficient chemical cross-linking with PVA, and when the mass ratio is larger than 200, it is difficult to obtain a uniform solution. More preferably, it is 100: 0.5 to 100: 30, and most preferably the mass ratio is 100: 0.5 to 100: 10.

接着剤4(PVA水溶液)の使用量は、ナイロン布層2の面積当たり0.005〜0.5g/cmが好ましく、0.01〜0.2g/cmがより好ましい。均一に塗布することが好ましい。 The amount of the adhesive 4 (PVA aqueous solution) used is preferably 0.005 to 0.5 g / cm 2 and more preferably 0.01 to 0.2 g / cm 2 per area of the nylon cloth layer 2. It is preferable to apply uniformly.

〔ナイロン布層2と外層3の接着〕
ナイロン布層2と外層3の間は、加硫融着(加硫接合)等の接着法により接着できる。
[Adhesion between nylon cloth layer 2 and outer layer 3]
The nylon cloth layer 2 and the outer layer 3 can be bonded by an adhesive method such as vulcanization fusion (vulcanization bonding).

〔コンサベータ用複合膜の製造方法〕
コンサベータ用複合膜10は、例えば、以下の手順により製造することができる。
(1)中間層1の両面にナイロン布層2を接着剤4で貼りつける。
(2)上記(1)のナイロン布層2の外側両面に外層3をゴム糊で貼りつける。
(3)上記(2)を加硫融着する。
[Method for producing composite membrane for conservator]
The conservator composite film 10 can be manufactured, for example, by the following procedure.
(1) A nylon cloth layer 2 is adhered to both surfaces of the intermediate layer 1 with an adhesive 4.
(2) The outer layer 3 is adhered to both outer surfaces of the nylon cloth layer 2 of (1) with rubber paste.
(3) The above (2) is vulcanized and fused.

〔本発明の実施の形態の効果〕
本発明の実施の形態によれば、EVOHフィルム等からなる中間層1と、ナイロン布層2との間の剥離強度が高く(特に10N/cm以上)、耐久性に優れている油入変圧器コンサベータ用複合膜を提供できる。
[Effect of the embodiment of the present invention]
According to the embodiment of the present invention, an oil-filled transformer having a high peel strength between the intermediate layer 1 made of an EVOH film or the like and the nylon cloth layer 2 (particularly 10 N / cm or more) and excellent in durability. A composite membrane for conservators can be provided.

〔他の実施の形態〕
本発明は、上記実施の形態に限定されず、その要旨を変更しない範囲内で種々な変形が可能である。例えば、コンサベータ用複合膜10は、いわゆる隔膜型に限らず、いわゆる袋型に適用することもできる。
[Other Embodiments]
The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the invention. For example, the composite membrane for conservator 10 is not limited to a so-called diaphragm type, and can be applied to a so-called bag type.

以下に本発明の実施例について説明するが、本発明はそれらによって限定されるものではない。   Examples of the present invention will be described below, but the present invention is not limited thereto.

(接着剤の評価試験1)
表1に示す接着剤について、中間層1として延伸ポリビニルアルコール(延伸PVA)フィルム層(厚さ12μm)(日本合成化学工業株式会社製、商品名「ボブロン」(二軸延伸PVA))(以下、PVAフィルムという)を用いて、ナイロン布層2との接着性を、以下のはく離接着強さ試験により評価した。
(Adhesive evaluation test 1)
About the adhesive shown in Table 1, stretched polyvinyl alcohol (stretched PVA) film layer (thickness 12 μm) as intermediate layer 1 (made by Nippon Synthetic Chemical Industry Co., Ltd., trade name “Boblon” (biaxially stretched PVA)) (hereinafter, The adhesiveness with the nylon cloth layer 2 was evaluated by the following peel adhesion strength test using a PVA film).

はく離接着強さ試験(180度はく離)は、「JISハンドブック2006 接着剤」の「はく離強さ試験方法K6854−2」の規格に準拠した以下の条件にて行った。
試験装置:JIS−K6854−2規格に準じた引張試験機
引張速度:50mm/min
引張試験試料寸法:幅20mm×長さ100mm
The peel adhesion strength test (180 degree peel) was performed under the following conditions in accordance with the standard of “peel strength test method K6854-2” of “JIS Handbook 2006 Adhesive”.
Test apparatus: Tensile tester according to JIS-K6854-2 standard Tensile speed: 50 mm / min
Tensile test sample dimensions: 20mm width x 100mm length

おおよそA5サイズくらいのPVAフィルムの両面にナイロン布を表1に記載の接着剤で全面接着させて(手張り)、上記引張試験試料寸法に切り出したものを試料検体とした。この試料検体の片面のナイロン布をアルミ板に貼り付けて固定し、もう一方の面の端部を引張試験機チャックで掴み、剥離強度(N/cm)を測定した。実施例1〜6のそれぞれについて試料検体を5枚作製し、測定を実施した。測定結果を表1に示す。   A nylon cloth was adhered to both sides of an approximately A5 size PVA film with the adhesive shown in Table 1 (hand tension), and the specimen cut out to the above-mentioned tensile test sample dimensions was used as a sample specimen. A nylon cloth on one side of this sample specimen was affixed and fixed to an aluminum plate, and the end of the other side was gripped with a tensile tester chuck, and the peel strength (N / cm) was measured. For each of Examples 1 to 6, five sample specimens were prepared and measured. The measurement results are shown in Table 1.

Figure 2010027676
Figure 2010027676

表1の水溶液中成分にはそれぞれ以下のものを使用した。
<ポリビニルアルコール樹脂(株式会社ゼネラルサイエンスコーポレーションより購入した実験用試薬)>
・PVA♯322(製品名:spp322、分子量:10000、けん化度:88モル%)
・PVA♯333(製品名:spp333、分子量:96000、けん化度:88モル%)
<水分散性ポリイソシアネート化合物(大日本インキ化学工業株式会社製)>
・DNW5000(製品名:バーノック(登録商標)DNW−5000)
The following components were used as components in the aqueous solution in Table 1.
<Polyvinyl alcohol resin (experimental reagent purchased from General Science Corporation)>
PVA # 322 (product name: spp322, molecular weight: 10,000, degree of saponification: 88 mol%)
PVA # 333 (product name: spp333, molecular weight: 96000, saponification degree: 88 mol%)
<Water dispersible polyisocyanate compound (Dainippon Ink Chemical Co., Ltd.)>
DNW5000 (Product name: Burnock (registered trademark) DNW-5000)

なお、PVAは、80℃で水に溶解させた。また、DNW5000を用いるものについては、PVAを溶解させた後に室温でDNW5000を添加・撹拌して分散させた。   PVA was dissolved in water at 80 ° C. Moreover, about what uses DNW5000, after dissolving PVA, DNW5000 was added and stirred at room temperature, and was disperse | distributed.

表1より、各実施例において良好な剥離強度が得られていることが判る。   From Table 1, it can be seen that good peel strength is obtained in each example.

(接着剤の評価試験2)
PVAフィルムの両面にナイロン布を表2に記載の接着剤で全面接着させる際、手張りではなく、加熱プレス(株式会社井元製作所製、製品名:IMC−181CM)を使用した点を除き、上記評価試験1と同様にして評価を行なった。測定結果を表2に示す。
(Adhesive evaluation test 2)
When the nylon cloth is adhered to both sides of the PVA film with the adhesive shown in Table 2, the above is used except for the use of a heating press (product name: IMC-181CM, manufactured by Imoto Seisakusho Co., Ltd.) instead of hand tension. Evaluation was performed in the same manner as in Evaluation Test 1. The measurement results are shown in Table 2.

Figure 2010027676
Figure 2010027676

表2の水溶液中成分にはそれぞれ以下のものを使用した。
<ポリビニルアルコール樹脂(株式会社ゼネラルサイエンスコーポレーションより購入した研究用試薬)>
・PVA♯322(製品名:spp322、分子量:10000、けん化度:88モル%)
・PVA♯333(製品名:spp333、分子量:96000、けん化度:88モル%)
・PVA♯336(製品名:spp336、分子量:3000、けん化度:88モル%)
<水分散性ポリイソシアネート化合物(大日本インキ化学工業株式会社製)>
・DNW5000(製品名:バーノック(登録商標)DNW−5000)
<一液水性反応硬化ウレタン樹脂>
・アクアレタン(製品名:アレスアクアレタン、関西ペイント株式会社製)
<水性ビニルウレタン架橋剤>
・AUH−1(製品名:AUH−1、アイカ工業製)
・AJ−1(製品名:AJ−1、光洋産業製、イソシアネート系木材接着剤)
The following components were used as the components in the aqueous solution in Table 2.
<Polyvinyl alcohol resin (reagent for research purchased from General Science Corporation)>
PVA # 322 (product name: spp322, molecular weight: 10,000, degree of saponification: 88 mol%)
PVA # 333 (product name: spp333, molecular weight: 96000, saponification degree: 88 mol%)
PVA # 336 (Product name: spp336, molecular weight: 3000, degree of saponification: 88 mol%)
<Water dispersible polyisocyanate compound (Dainippon Ink Chemical Co., Ltd.)>
DNW5000 (Product name: Burnock (registered trademark) DNW-5000)
<One-part aqueous reaction-cured urethane resin>
・ Aqualetane (Product name: Ares Aquaretane, manufactured by Kansai Paint Co., Ltd.)
<Water-based vinyl urethane cross-linking agent>
・ AUH-1 (Product name: AUH-1, manufactured by Aika Industries)
・ AJ-1 (Product name: AJ-1, Koyo Sangyo, isocyanate wood adhesive)

なお、PVAは、80℃で水に溶解させた。また、DNW5000などの硬化剤を用いるものについては、PVAを溶解させた後に室温でDNW5000などの硬化剤を添加・撹拌して分散させた。   PVA was dissolved in water at 80 ° C. Moreover, about what uses hardening | curing agents, such as DNW5000, after dissolving PVA, the hardening | curing agents, such as DNW5000, were added and stirred at room temperature, and were disperse | distributed.

表2より、各実施例において良好な剥離強度が得られていることが判る。   From Table 2, it can be seen that good peel strength is obtained in each example.

本発明の実施の形態に係るコンサベータ用複合膜の構成を示す断面図である。It is sectional drawing which shows the structure of the composite film for conservators which concerns on embodiment of this invention. 油入変圧器の構成例を示す構成図である。It is a block diagram which shows the structural example of an oil-filled transformer. 従来のコンサベータ用複合膜の構成を示す断面図である。It is sectional drawing which shows the structure of the conventional composite membrane for conservators.

符号の説明Explanation of symbols

10:コンサベータ用複合膜
1:中間層(EVOHフィルム)、2:ナイロン布層
3:外層(ニトリルゴム)、4:接着剤(PVA水溶液)
100:油入変圧器、11:変圧器本体、12:タンク
13:絶縁油、14:碍子、15:連結管
16:コンサベータ、17:連結管、18:吸湿呼吸器
20:コンサベータ用複合膜
21:中間層(EVOHフィルム)、22:内層(ナイロン布)
23:外層(ニトリルゴム)、24:接着剤(有機溶剤系ゴム糊)
10: Composite membrane for conservator 1: Intermediate layer (EVOH film) 2: Nylon cloth layer 3: Outer layer (nitrile rubber) 4: Adhesive (PVA aqueous solution)
100: oil-filled transformer, 11: transformer body, 12: tank 13: insulating oil, 14: insulator, 15: connecting pipe 16: conservator, 17: connecting pipe, 18: hygroscopic respirator 20: composite for conservator Membrane 21: Intermediate layer (EVOH film), 22: Inner layer (nylon cloth)
23: Outer layer (nitrile rubber), 24: Adhesive (organic solvent rubber paste)

Claims (11)

酸素ガスバリア性を有する酸化防止用の高分子材料による中間層と、前記中間層の両面にそれぞれ設けられたナイロン布層と、前記ナイロン布層のそれぞれの外側表面(前記ナイロン布層対向面とは反対側の面)に設けられた耐油物質による外層とを備え、
前記中間層と前記ナイロン布とは、ポリビニルアルコール樹脂を溶解した水溶液(以下、PVA水溶液という)により接着されていることを特徴とする油入変圧器コンサベータ用複合膜。
An intermediate layer made of an antioxidant polymer material having an oxygen gas barrier property, a nylon cloth layer provided on each side of the intermediate layer, and an outer surface of each nylon cloth layer (the nylon cloth layer facing surface is An outer layer made of an oil-resistant substance provided on the opposite surface)
The composite film for an oil-filled transformer conservator, wherein the intermediate layer and the nylon cloth are bonded with an aqueous solution in which a polyvinyl alcohol resin is dissolved (hereinafter referred to as a PVA aqueous solution).
前記ポリビニルアルコール樹脂は、分子量3000〜96000であることを特徴とする請求項1に記載の油入変圧器コンサベータ用複合膜。   The composite film for an oil-filled transformer conservator according to claim 1, wherein the polyvinyl alcohol resin has a molecular weight of 3000 to 96000. 前記PVA水溶液は、前記ポリビニルアルコール樹脂の濃度が8〜30質量%であることを特徴とする請求項1又は請求項2に記載の油入変圧器コンサベータ用複合膜。   3. The composite membrane for an oil-filled transformer conservator according to claim 1, wherein the PVA aqueous solution has a concentration of the polyvinyl alcohol resin of 8 to 30% by mass. 前記PVA水溶液は、水中で前記ポリビニルアルコール樹脂の水酸基と反応することができる硬化剤が分散されていることを特徴とする請求項1乃至請求項3のいずれか1項に記載の油入変圧器コンサベータ用複合膜。   The oil-filled transformer according to any one of claims 1 to 3, wherein a curing agent capable of reacting with a hydroxyl group of the polyvinyl alcohol resin is dispersed in the PVA aqueous solution. Composite membrane for conservators. 前記硬化剤は、水分散性ポリイソシアネート化合物であることを特徴とする請求項4に記載の油入変圧器コンサベータ用複合膜。   The composite film for an oil-filled transformer conservator according to claim 4, wherein the curing agent is a water-dispersible polyisocyanate compound. 前記硬化剤は、一液水性反応硬化ウレタン樹脂であることを特徴とする請求項4に記載の油入変圧器コンサベータ用複合膜。   The composite film for an oil-filled transformer conservator according to claim 4, wherein the curing agent is a one-component aqueous reaction-cured urethane resin. 前記硬化剤は、水性ビニルウレタン架橋剤であることを特徴とする請求項4に記載の油入変圧器コンサベータ用複合膜。   The composite film for an oil-filled transformer conservator according to claim 4, wherein the curing agent is an aqueous vinyl urethane cross-linking agent. 前記PVA水溶液は、前記ポリビニルアルコール樹脂:前記硬化剤=100:0.5〜100:10の質量比で含有していることを特徴とする請求項4乃至請求項7のいずれか1項に記載の油入変圧器コンサベータ用複合膜。   The said PVA aqueous solution contains the said polyvinyl alcohol resin: the said hardening | curing agent = 100: 0.5-100: 10 mass ratio, The any one of Claim 4 thru | or 7 characterized by the above-mentioned. Composite membrane for oil-filled transformer conservators. 前記中間層を構成する前記高分子材料は、室温(20〜25℃)、湿度0%で酸素透過率が、3.5cm/m・24h・atm以下、50℃、湿度0%で酸素透過率が、30cm/m・24h・atm以下、室温(20〜25℃)における水蒸気透過率が、1000g/m・24h以下、50℃における水蒸気透過率が、5000g/m・24h以下の高分子材料であることを特徴とする請求項1乃至請求項8のいずれか1項に記載の油入変圧器コンサベータ用複合膜。 The polymer material constituting the intermediate layer is oxygen at room temperature (20 to 25 ° C.), humidity 0%, oxygen permeability of 3.5 cm 3 / m 2 · 24 h · atm or less, 50 ° C., humidity 0%. The permeability is 30 cm 3 / m 2 · 24 h · atm or less, the water vapor permeability at room temperature (20 to 25 ° C.) is 1000 g / m 2 · 24 h or less, and the water vapor permeability at 50 ° C. is 5000 g / m 2 · 24 h. The composite film for an oil-filled transformer conservator according to any one of claims 1 to 8, wherein the composite film is the following polymer material. 前記高分子材料は、エチレン−ビニルアルコール共重合体樹脂(EVOH)、延伸ポリビニルアルコール(延伸PVA)、又はポリ塩化ビニリデン(PVDC)であることを特徴とする請求項1乃至請求項9のいずれか1項に記載の油入変圧器コンサベータ用複合膜。   10. The polymer material according to claim 1, wherein the polymer material is ethylene-vinyl alcohol copolymer resin (EVOH), stretched polyvinyl alcohol (stretched PVA), or polyvinylidene chloride (PVDC). The composite membrane for oil-filled transformer conservators according to item 1. 前記外層を構成する前記耐油物質は、ニトリルゴムであることを特徴とする請求項1乃至請求項10のいずれか1項に記載の油入変圧器コンサベータ用複合膜。   The composite film for an oil-filled transformer conservator according to any one of claims 1 to 10, wherein the oil-resistant substance constituting the outer layer is nitrile rubber.
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