JP2003344262A - Method for diagnosing degree of deterioration of high polymer material - Google Patents
Method for diagnosing degree of deterioration of high polymer materialInfo
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- JP2003344262A JP2003344262A JP2002153235A JP2002153235A JP2003344262A JP 2003344262 A JP2003344262 A JP 2003344262A JP 2002153235 A JP2002153235 A JP 2002153235A JP 2002153235 A JP2002153235 A JP 2002153235A JP 2003344262 A JP2003344262 A JP 2003344262A
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- Prior art keywords
- deterioration
- degree
- polymer material
- tensile strength
- crystallization temperature
- Prior art date
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、例えばガス絶縁
変圧器等の電気機器の巻線絶縁材料の熱劣化による劣化
度の推定、診断などに好ましく用いることができる高分
子材料の劣化度診断方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of diagnosing deterioration degree of polymer material, which can be preferably used for estimating and diagnosing deterioration degree of winding insulation material of electric equipment such as gas insulated transformer due to heat deterioration. It is about.
【０００２】[0002]
【従来の技術】油入り電気機器、例えば油入変圧器など
の巻線絶縁材料には、コイル絶縁紙（クラフトパルプ）
が用いられている。コイル絶縁紙が熱劣化すると、引張
り強度などの機械的強度が低下するが、この機械的強度
と平均重合度との間に相関関係が見られる。これを基に
して、コイル絶縁紙の劣化度は平均重合度で評価するの
が一般的になっている。因みに、日本電機工業会（以下
ＪＥＭと呼ぶ）のＪＥＭ１４６３「変圧器用絶縁紙の平
均重合度評価基準」によれば、平均重合度「４５０以
下」が寿命レベル（コイル絶縁紙の使用限界）として規
程されている。Coil insulation paper (kraft pulp) is used for winding insulation materials such as oil-filled electrical equipment such as oil-filled transformers.
Is used. When the coil insulation paper is deteriorated by heat, mechanical strength such as tensile strength is lowered, but there is a correlation between the mechanical strength and the average degree of polymerization. Based on this, the degree of deterioration of the coil insulating paper is generally evaluated by the average degree of polymerization. By the way, according to JEM1463 “Evaluation Standard of Average Degree of Polymerization of Insulating Paper for Transformers” of Japan Electrical Manufacturers' Association (hereinafter referred to as JEM), the average degree of polymerization “450 or less” is defined as the life level (use limit of coil insulating paper). Has been done.
【０００３】また、ガス絶縁変圧器の巻線絶縁材料に
は、例えばポリエチレンテレフタレート（以下、「ＰＥ
Ｔ」と略称する）やポリフェニレンサルファイド（以
下、「ＰＰＳ」と略称する）フィルムなどが使用されて
いる。このような高分子フィルムを巻線絶縁材料として
用いたガス絶縁変圧器についても、油入変圧器と同様、
巻線絶縁材料の高分子フィルムが熱劣化によって機械強
度が低下した時点が寿命と考えられるため、ガス絶縁変
圧器の寿命を判断する上で、巻線絶縁材料の劣化度を評
価することが重要となる。The winding insulation material of the gas insulation transformer is, for example, polyethylene terephthalate (hereinafter referred to as "PE").
T ") and polyphenylene sulfide (hereinafter abbreviated as" PPS ") films are used. A gas-insulated transformer using such a polymer film as a winding insulating material is also similar to the oil-filled transformer.
It is important to evaluate the degree of deterioration of the winding insulation material when determining the life of the gas-insulated transformer, because the life is considered to be when the mechanical strength of the polymer film of the winding insulation material deteriorates due to heat deterioration. Becomes
【０００４】このような絶縁材料の劣化度は、例えば、
「ガス絶縁変圧器巻線絶縁フィルム材料の熱的劣化度評
価技術の研究」（平成９年電気学会全国大会予稿、５−
２６４）に示されるような、分子量から評価する方法も
提案されているが、一般的には引張り強度で評価されて
いる。The degree of deterioration of such an insulating material is, for example,
“Study on evaluation technology of thermal deterioration of gas insulation transformer winding insulation film material”
264), a method of evaluating from the molecular weight has been proposed, but generally the tensile strength is evaluated.
【０００５】また、例えば特開平３−３７５５７号公
報、および特開平９−１７０９８９号公報などに、絶縁
材料の劣化度を示差走査熱量計［以下ＤＳＣ（Differen
tial Scanning Calorimetry）と略称する］で評価する
技術が開示されている。これらの方法においては、図４
（特開平９−１７０９８９号公報に記載）の熱融解曲線
に示すように、メインの融解ピークの低温側に新たに生
成した融解ピークの深さを基にして材料の劣化度が評価
される。さらに、特開平５−３２２８１１号公報に記載
の方法では、図５に示すように、ＤＳＣ曲線における融
解熱量から熱劣化を判定している。Further, for example, Japanese Patent Laid-Open Nos. 3-37557 and 9-170989 disclose the degree of deterioration of an insulating material by a differential scanning calorimeter [hereinafter referred to as DSC (Differen
abbreviated as "tial Scanning Calorimetry"] is disclosed. In these methods, FIG.
As shown in the thermal melting curve of JP-A-9-170989, the degree of deterioration of the material is evaluated based on the depth of the melting peak newly generated on the low temperature side of the main melting peak. Furthermore, in the method described in Japanese Patent Laid-Open No. 5-322811, as shown in FIG. 5, thermal deterioration is determined from the heat of fusion in the DSC curve.
【０００６】[0006]
【発明が解決しようとする課題】電気機器に使用されて
いる巻線絶縁材料の劣化度を引張り強度で評価する場合
については、以下のおよびのような問題点があっ
た。
引張り試験には多量の試料が必要。
因みに、ＪＩＳＣ２３１８電気用ポリエステルフィルム
の場合、
幅×長さ＝１５ｍｍ×２００ｍｍ
試料数 ｎ＝５
引張り強度はフィルム端面の傷等の影響でばらつきが
大きい。In the case of evaluating the deterioration degree of the winding insulating material used in electric equipment by the tensile strength, there are the following problems. A large amount of sample is required for the tensile test. Incidentally, in the case of JISC2318 electrical polyester film, width × length = 15 mm × 200 mm number of samples n = 5 tensile strength varies greatly due to the influence of scratches on the film end face.
【０００７】一方、上記特開平３−３７５５７号公報、
および特開平９−１７０９８９号公報記載の発明は、履
歴温度と履歴時間を推定するもので、引張り強度を求め
るものではない。また、上記特開平５−３２２８１１号
公報記載の発明は、熱可塑性結晶性ポリマーの劣化の度
合いを評価するものであるが、リサイクルのための選別
方法を得ることを目的としており、やはり引張り強度を
求めるものではない。On the other hand, the above-mentioned Japanese Patent Laid-Open No. 3-37557,
The invention described in Japanese Patent Application Laid-Open No. 9-170989 estimates the hysteresis temperature and the hysteresis time, and does not obtain the tensile strength. Further, the invention described in the above-mentioned JP-A-5-322811 is intended to evaluate the degree of deterioration of the thermoplastic crystalline polymer, but the purpose is to obtain a sorting method for recycling, and also to determine the tensile strength. Not what you want.
【０００８】この発明は、上記のような従来技術の課題
を解消するためになされたもので、極少量（例えば約１
０ｍｇ程度）の試料で、容易に引張り強度に対応する劣
化度の推定が可能な高分子材料の劣化度の推定方法を提
供することを目的とするものである。The present invention has been made in order to solve the problems of the prior art as described above, and has an extremely small amount (for example, about 1).
It is an object of the present invention to provide a method of estimating the degree of deterioration of a polymer material, which can easily estimate the degree of deterioration corresponding to the tensile strength with a sample of about 0 mg).
【０００９】[0009]
【課題を解決するための手段】この発明による高分子材
料の劣化度診断方法は、高分子材料を所定の条件で劣化
させた試料について、引張り強度と、熱分析計による結
晶化温度との関係を予め求め、該求められた引張り強度
と結晶化温度との相関関係を基にして、高分子材料の被
検体について熱分析計により測定された結晶化温度か
ら、当該高分子材料の劣化度を診断するようにしたもの
である。The method for diagnosing the degree of deterioration of a polymeric material according to the present invention relates to the relationship between the tensile strength and the crystallization temperature measured by a thermal analyzer for a sample obtained by degrading a polymeric material under predetermined conditions. Was obtained in advance, based on the correlation between the obtained tensile strength and the crystallization temperature, from the crystallization temperature measured by a thermal analyzer for the sample of the polymer material, the degree of deterioration of the polymer material was calculated. It was made to diagnose.
【００１０】また、上記熱分析計として示差走査熱量計
を用い、上記高分子材料の劣化度を診断することを特徴
とするものである。A differential scanning calorimeter is used as the thermal analyzer to diagnose the degree of deterioration of the polymer material.
【００１１】さらに、上記高分子材料として電気機器に
用いられる絶縁材料を用い、長期間使用された実機の電
気機器からサンプリングされた絶縁材料の抗張力残存率
を推定することを特徴とするものである。Further, the present invention is characterized in that an insulating material used in electric equipment is used as the polymer material, and a residual tensile strength of the insulating material sampled from an electric equipment of an actual machine used for a long period of time is estimated. .
【００１２】[0012]
【発明の実施の形態】実施の形態１．本発明者らは上記
従来技術の課題に鑑み、鋭意解決策を検討した結果、Ｐ
ＥＴフィルムなどの高分子材料の引張り強度とＤＳＣ曲
線から求めた結晶化温度とは良い相関性があることか
ら、実機のガス絶縁変圧器などの電気機器から採取した
ＰＥＴフィルムのＤＳＣ曲線による結晶化温度を測定す
ることで、引張り強度が推定できることを見い出し、こ
の発明を完成させたものである。BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. In view of the above-mentioned problems of the prior art, the inventors of the present invention have studied earnestly and found that
Since there is a good correlation between the tensile strength of polymer materials such as ET film and the crystallization temperature obtained from the DSC curve, the crystallization of the PET film taken from electrical equipment such as the actual gas insulated transformer using the DSC curve The inventors have found that the tensile strength can be estimated by measuring the temperature, and have completed the present invention.
【００１３】以下、この発明の実施の形態１を図１〜図
３を参照して説明する。なお、図１は一例として未劣化
のＰＥＴフィルム（新品）について測定されたＤＳＣ曲
線を示す特性図、図２は同じＰＥＴフィルムを１６０
℃、１０日間加熱劣化させた試料について測定されたＤ
ＳＣ曲線を示す特性図、図３はＰＥＴフィルムの引張り
強度と結晶化温度の関係を示す相関図である。The first embodiment of the present invention will be described below with reference to FIGS. In addition, FIG. 1 is a characteristic diagram showing a DSC curve measured for an undeteriorated PET film (new article) as an example, and FIG.
D measured on a sample aged at ℃ for 10 days
FIG. 3 is a characteristic diagram showing an SC curve, and FIG. 3 is a correlation diagram showing the relationship between the tensile strength of the PET film and the crystallization temperature.
【００１４】なお、ここでは一例としてＰＥＴフィルム
を窒素雰囲気中、１６０℃で１日、２日、３日、４日、
６日、および１０日間、それぞれ加熱劣化させた試料を
用いて、ＤＳＣ特性と引張り強度との関係を調べた結果
をもとに説明する。Here, as an example, a PET film in a nitrogen atmosphere at 160 ° C. for 1 day, 2 days, 3 days, 4 days,
A description will be given based on the results of examining the relationship between the DSC characteristics and the tensile strength using samples that have been heat-deteriorated for 6 days and 10 days, respectively.
【００１５】図１は未劣化のＰＥＴフィルム（新品）に
ついてＤＳＣにより測定された特性図であり、横軸は温
度、縦軸は熱量を示す。この図１から未劣化のＰＥＴフ
ィルムの結晶化温度は１２４．１℃であることが分か
る。これに対して、１６０℃で１０日間加熱劣化させた
ＰＥＴフィルムについて、同様にＤＳＣにより測定され
た結晶化温度は図２に示すように１１７．１℃であっ
た。同様にして窒素雰囲気中、１６０℃で１日、２日、
３日、４日、および６日間、それぞれ加熱劣化させた試
料についても、ＤＳＣにより結晶化温度を測定した。
（詳細図示省略）FIG. 1 is a characteristic diagram of an undeteriorated PET film (new article) measured by DSC. The horizontal axis represents temperature and the vertical axis represents heat quantity. From FIG. 1, it can be seen that the crystallization temperature of the undeteriorated PET film is 124.1 ° C. On the other hand, for the PET film heat-deteriorated at 160 ° C. for 10 days, the crystallization temperature similarly measured by DSC was 117.1 ° C. as shown in FIG. Similarly, in a nitrogen atmosphere at 160 ° C for 1 or 2 days,
The crystallization temperature was also measured by DSC for the samples that had been aged for 3 days, 4 days, and 6 days.
(Details not shown)
【００１６】一方、上記と全く同一の条件で加熱劣化さ
せたＰＥＴフィルムについて、それぞれ引張り強度を測
定した。図３は、上記のように加熱劣化させたＰＥＴフ
ィルムについて測定された引張り強度と結晶化温度との
関係をプロットしたものであり、横軸は結晶化温度（１
０００／Ｔ）、縦軸は、未劣化（新品）の試料の抗張力
を１００％としたときの、各劣化試料の抗張力残存率を
１００分率で示す。なお、ＴはＤＳＣによって測定され
た結晶化温度を絶対温度で示したものである。On the other hand, the tensile strength of each PET film heat-deteriorated under the same conditions as above was measured. FIG. 3 is a plot of the relationship between the tensile strength and the crystallization temperature measured for the PET film heat-deteriorated as described above, and the horizontal axis represents the crystallization temperature (1
000 / T), and the vertical axis represents the residual tensile strength of each deteriorated sample as a percentage, where the tensile strength of an undeteriorated (new) sample is 100%. In addition, T shows the crystallization temperature measured by DSC in absolute temperature.
【００１７】図３から、ＰＥＴフィルムは劣化するに従
い、引張り強度が低下する。また引張り強度の低下と共
に結晶化温度は低くなり、引張り強度と結晶化温度とは
良い相関性があり、この相関関係を基準にして、長期間
使用された実機の電気機器からサンプリングした極少量
の絶縁材料の被検試料についてＤＳＣを用いて結晶化温
度を測定し、その結晶化温度から該絶縁材料の劣化度を
容易に診断ないしは推定できることが確認できた。From FIG. 3, the tensile strength of the PET film decreases as it deteriorates. In addition, the crystallization temperature decreases as the tensile strength decreases, and there is a good correlation between the tensile strength and the crystallization temperature.Based on this correlation, a very small amount of the electrical equipment sampled from the actual electrical equipment used for a long time It was confirmed that the crystallization temperature of the test sample of the insulating material was measured using DSC, and the degree of deterioration of the insulating material could be easily diagnosed or estimated from the crystallization temperature.
【００１８】さらに具体的には、寿命の診断を行う場
合、仮に寿命の目安としてコイル絶縁材としてのＰＥＴ
フィルムの平均重合度「４５０」に相当する強度とし
て、初期値の例えば５０％に低下したときとすると、図
３から抗張力残存率５０％に対応する結晶化温度は、
２．５４０（１０００／Ｔ、但し、Ｔは結晶化温度、単
位＝ケルビン）であり、巻線のＰＥＴフィルム絶縁材か
ら採取した１０ｍｇ程度の極少量の被検体の結晶化温度
をＤＳＣにより測定し、測定された結晶化温度（１００
０／Ｔ）がこれよりも大きくなると寿命到来と判定する
ことができる。More specifically, when diagnosing the life, PET as a coil insulating material is temporarily used as a guide for the life.
Assuming that the strength corresponding to the average degree of polymerization of the film “450” is lowered to, for example, 50% of the initial value, the crystallization temperature corresponding to the tensile strength residual rate of 50% is as shown in FIG.
2.540 (1000 / T, where T is crystallization temperature, unit = Kelvin), and the crystallization temperature of a very small amount of about 10 mg of the sample collected from the PET film insulating material of the winding was measured by DSC. , The measured crystallization temperature (100
When 0 / T) is larger than this, it can be determined that the life has expired.
【００１９】上記のように実施の形態１によれば次のよ
うな効果が得られる。
・ＰＥＴフィルムの引張り強度と結晶化温度とは良い相
関性があることから、実機の電気機器から採取したＰＥ
Ｔフィルムの結晶化温度をＤＳＣなどの熱分析計により
測定することで、引張り強度が推定でき、劣化度を診断
することができる。
・ＤＳＣ特性から高分子材料の劣化度が推定できること
から、極微量の試料で評価が可能になる。According to the first embodiment as described above, the following effects can be obtained.・ Because there is a good correlation between the tensile strength of the PET film and the crystallization temperature, PE collected from the actual electrical equipment
By measuring the crystallization temperature of the T film with a thermal analyzer such as DSC, the tensile strength can be estimated and the degree of deterioration can be diagnosed. -Since the deterioration degree of the polymer material can be estimated from the DSC characteristics, it is possible to evaluate with a very small amount of sample.
【００２０】なお上記実施の形態の説明では、高分子材
料がＰＥＴフィルムの場合について説明したが、これに
限定されるものではなく、他の高分子材料、例えばＰＰ
Ｓフィルム、ポリエチレン、ポリプロピレン、ポリエチ
レンナフタレート、ポリブチレンテレフタレート、ナイ
ロン、ポリアセタール等の結晶性の高分子材料について
も適用可能であることは言うまでもない。In the above description of the embodiment, the case where the polymer material is a PET film has been described, but the present invention is not limited to this, and another polymer material such as PP is used.
It goes without saying that it is also applicable to crystalline polymer materials such as S film, polyethylene, polypropylene, polyethylene naphthalate, polybutylene terephthalate, nylon and polyacetal.
【００２１】また、電気機器の絶縁材料に用いられる高
分子材料の場合に特に効果が大きいが、他の用途に用い
られるものであっても同様に診断することができる。ま
た、寿命診断の条件は一例を示したに過ぎず、実施の形
態のものに限定されるものでないことは当然である。Further, the effect is particularly great in the case of a polymer material used as an insulating material of electric equipment, but the same diagnosis can be made even if it is used for other purposes. Further, the conditions for life diagnosis are merely examples, and needless to say, are not limited to those of the embodiment.
【００２２】また、熱分析装置としてＤＳＣを用いる場
合について説明したが、少量の試料で結晶化温度を測定
できるものであればよく、例えば示差熱分析装置など、
他の熱分析装置であっても同様の効果を期待することが
できる。さらに、電気機器がガス絶縁変圧器の場合につ
いて説明したが、これに限定されるものではなく、例え
ば、変流器、リアクトル、回転電機、コンデンサ等であ
っても同様の効果を期待することができる。Although the case where the DSC is used as the thermal analysis device has been described, any device capable of measuring the crystallization temperature with a small amount of sample may be used, such as a differential thermal analysis device.
Similar effects can be expected with other thermal analysis devices. Furthermore, although the case where the electric device is a gas-insulated transformer has been described, the present invention is not limited to this, and similar effects can be expected even if the electric device is a current transformer, a reactor, a rotating electric machine, a capacitor, or the like. it can.
【００２３】[0023]
【発明の効果】以上説明したとおり、この発明によれば
次のような効果が得られる。請求項１に記載した第１の
発明によれば、極微量の試料で引張り強度に対応する高
分子材料の劣化度の診断を容易に行うことができる。As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, the degree of deterioration of the polymer material corresponding to the tensile strength can be easily diagnosed with an extremely small amount of sample.
【００２４】請求項２に記載した第２の発明によれば、
熱分析計として示差走査熱量計を用い、高分子材料の劣
化度を診断するようにしたので、極微量の試料で引張り
強度に対応する高分子材料の劣化度の診断を精度高く行
うことができる。According to the second invention described in claim 2,
Since the differential scanning calorimeter is used as a thermal analyzer to diagnose the degree of deterioration of the polymer material, it is possible to accurately diagnose the degree of deterioration of the polymer material corresponding to the tensile strength with a very small amount of sample. .
【００２５】請求項３に記載した第３の発明によれば、
高分子材料として電気機器に用いられる絶縁材料を用
い、長期間使用された実機の電気機器からサンプリング
された絶縁材料の抗張力残存率を推定するようにしたの
で、極微量の試料で引張り強度に対応する高分子材料の
劣化度の診断が可能になり、電気機器の信頼性向上につ
なげることもできる。According to the third invention described in claim 3,
Since the insulating material used for electrical equipment is used as the polymer material and the residual tensile strength of the insulating material sampled from the electrical equipment of the actual equipment used for a long time is estimated, it is possible to handle tensile strength with a very small amount of sample. It is possible to diagnose the degree of deterioration of the polymer material, and it is possible to improve the reliability of electrical equipment.
【図１】 未劣化のＰＥＴフィルム（新品）について測
定されたＤＳＣ曲線である。FIG. 1 is a DSC curve measured for undegraded PET film (new).
【図２】 窒素雰囲気中で１６０℃、１０日間加熱劣化
させたＰＥＴフィルムについて測定されたＤＳＣ曲線で
ある。FIG. 2 is a DSC curve measured for a PET film heat-aged in a nitrogen atmosphere at 160 ° C. for 10 days.
【図３】 実施の形態１による絶縁材料の劣化度診断方
法に用いるＰＥＴフィルムの引張り強度と結晶化温度の
関係を示す相関図である。FIG. 3 is a correlation diagram showing the relationship between the tensile strength and the crystallization temperature of the PET film used in the method for diagnosing the degree of deterioration of the insulating material according to the first embodiment.
【図４】 従来技術である特開平９−１７０９８９号公
報に記載された示差走査熱量測定による熱融解曲線の一
例図である。FIG. 4 is an example diagram of a thermal melting curve by differential scanning calorimetry described in Japanese Patent Application Laid-Open No. 9-170989.
【図５】 従来技術である特開平５−３２２８１１号公
報に記載された示差走査熱量測定による熱融解量を示す
図である。FIG. 5 is a diagram showing a thermal melting amount by differential scanning calorimetry described in Japanese Patent Laid-Open No. 5-322811, which is a conventional technique.
（符号なし） (No code)
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2G040 AA05 AB12 BA02 BA27 CA02 CA03 DA02 EB02 EC08 EC09 HA06 HA11 HA12 2G050 AA02 BA10 CA01 DA01 EA01 EB01 EB10 EC05 2G061 AA01 AB01 BA04 CA09 CB01 EA01 EA02 EC02 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 2G040 AA05 AB12 BA02 BA27 CA02 CA03 DA02 EB02 EC08 EC09 HA06 HA11 HA12 2G050 AA02 BA10 CA01 DA01 EA01 EB01 EB10 EC05 2G061 AA01 AB01 BA04 CA09 CB01 EA01 EA02 EC02
Claims (3)
料について、引張り強度と、熱分析計による結晶化温度
との関係を予め求め、該求められた引張り強度と結晶化
温度との相関関係を基にして、高分子材料の被検体につ
いて熱分析計により測定された結晶化温度から、当該高
分子材料の劣化度を診断することを特徴とする高分子材
料の劣化度診断方法。1. The relationship between the tensile strength and the crystallization temperature measured by a thermal analyzer is obtained in advance for a sample obtained by degrading a polymer material under predetermined conditions, and the correlation between the obtained tensile strength and the crystallization temperature is obtained. A deterioration degree diagnosing method for a polymer material, which comprises diagnosing a deterioration degree of the polymer material from a crystallization temperature measured by a thermal analyzer for a specimen of the polymer material based on the relationship.
い、上記高分子材料の劣化度を診断することを特徴とす
る請求項１に記載の高分子材料の劣化度診断方法。2. The method for diagnosing the degree of deterioration of a polymeric material according to claim 1, wherein a differential scanning calorimeter is used as the thermal analyzer to diagnose the degree of deterioration of the polymeric material.
れる絶縁材料を用い、長期間使用された実機の電気機器
からサンプリングされた絶縁材料の抗張力残存率を推定
することを特徴とする請求項１または請求項２に記載の
高分子材料の劣化度診断方法。3. The tensile strength residual ratio of an insulating material sampled from an electric device of an actual machine used for a long period of time is estimated by using an insulating material used for an electric device as the polymer material. Alternatively, the method for diagnosing the degree of deterioration of the polymer material according to claim 2.
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|---|---|---|---|
| JP2002153235A JP2003344262A (en) | 2002-05-28 | 2002-05-28 | Method for diagnosing degree of deterioration of high polymer material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002153235A JP2003344262A (en) | 2002-05-28 | 2002-05-28 | Method for diagnosing degree of deterioration of high polymer material |
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| Publication Number | Publication Date |
|---|---|
| JP2003344262A true JP2003344262A (en) | 2003-12-03 |
Family
ID=29770317
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|---|---|---|---|
| JP2002153235A Pending JP2003344262A (en) | 2002-05-28 | 2002-05-28 | Method for diagnosing degree of deterioration of high polymer material |
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| JP2013117415A (en) * | 2011-12-02 | 2013-06-13 | Nippon Telegr & Teleph Corp <Ntt> | Coating degradation detection method |
| JP2015102377A (en) * | 2013-11-22 | 2015-06-04 | 千代田化工建設株式会社 | Evaluation method of resin |
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2002
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100776641B1 (en) | 2006-06-27 | 2007-11-15 | 한국원자력연구원 | Evaluation method on degradation of polymeric materials by using dielectric relaxation properties |
| JP2013117415A (en) * | 2011-12-02 | 2013-06-13 | Nippon Telegr & Teleph Corp <Ntt> | Coating degradation detection method |
| JP2015102377A (en) * | 2013-11-22 | 2015-06-04 | 千代田化工建設株式会社 | Evaluation method of resin |
| JP2018205232A (en) * | 2017-06-08 | 2018-12-27 | 株式会社Ihi | Strain amount estimation method and strain amount estimation device for precipitation hardening type aluminum alloy member |
| JP2019194522A (en) * | 2018-04-30 | 2019-11-07 | 愛知電機株式会社 | Manufacturing method of color sample/color difference criteria and deterioration diagnosis method for oil-filled electrical equipment using color difference criteria |
| JP7152178B2 (en) | 2018-04-30 | 2022-10-12 | 愛知電機株式会社 | Deterioration diagnosis method for oil-filled electrical equipment |
| JP2021156862A (en) * | 2020-03-26 | 2021-10-07 | 株式会社日立ハイテクサイエンス | Sample container for thermal analysis and thermal analyzer having the same |
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