JPH0477540B2 - - Google Patents
Info
- Publication number
- JPH0477540B2 JPH0477540B2 JP61161563A JP16156386A JPH0477540B2 JP H0477540 B2 JPH0477540 B2 JP H0477540B2 JP 61161563 A JP61161563 A JP 61161563A JP 16156386 A JP16156386 A JP 16156386A JP H0477540 B2 JPH0477540 B2 JP H0477540B2
- Authority
- JP
- Japan
- Prior art keywords
- epoxy resin
- solvent
- resin composition
- refrigerant
- mica tape
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003822 epoxy resin Substances 0.000 claims description 63
- 229920000647 polyepoxide Polymers 0.000 claims description 63
- 239000000203 mixture Substances 0.000 claims description 44
- 239000010445 mica Substances 0.000 claims description 29
- 229910052618 mica group Inorganic materials 0.000 claims description 29
- 239000003795 chemical substances by application Substances 0.000 claims description 26
- 239000003507 refrigerant Substances 0.000 claims description 26
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 22
- 239000011230 binding agent Substances 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000005470 impregnation Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 12
- -1 imidazole compound Chemical class 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 11
- 125000001731 2-cyanoethyl group Chemical group [H]C([H])(*)C([H])([H])C#N 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 claims description 9
- 239000003085 diluting agent Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 description 20
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 239000004593 Epoxy Substances 0.000 description 5
- 239000004744 fabric Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 150000008065 acid anhydrides Chemical class 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 150000004982 aromatic amines Chemical class 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 3
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 239000002966 varnish Substances 0.000 description 3
- SESYNEDUKZDRJL-UHFFFAOYSA-N 3-(2-methylimidazol-1-yl)propanenitrile Chemical compound CC1=NC=CN1CCC#N SESYNEDUKZDRJL-UHFFFAOYSA-N 0.000 description 2
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000003808 methanol extraction Methods 0.000 description 2
- 239000004843 novolac epoxy resin Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- BVYPJEBKDLFIDL-UHFFFAOYSA-N 3-(2-phenylimidazol-1-yl)propanenitrile Chemical compound N#CCCN1C=CN=C1C1=CC=CC=C1 BVYPJEBKDLFIDL-UHFFFAOYSA-N 0.000 description 1
- XGQUSGCBVBFRGX-UHFFFAOYSA-N 3-[4,5-bis(2-cyanoethoxymethyl)-2-phenylimidazol-1-yl]propanenitrile Chemical compound N#CCCN1C(COCCC#N)=C(COCCC#N)N=C1C1=CC=CC=C1 XGQUSGCBVBFRGX-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- FQYUMYWMJTYZTK-UHFFFAOYSA-N Phenyl glycidyl ether Chemical compound C1OC1COC1=CC=CC=C1 FQYUMYWMJTYZTK-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- 150000001244 carboxylic acid anhydrides Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- LDLDYFCCDKENPD-UHFFFAOYSA-N ethenylcyclohexane Chemical compound C=CC1CCCCC1 LDLDYFCCDKENPD-UHFFFAOYSA-N 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Manufacture Of Motors, Generators (AREA)
Description
〔産業上の利用分野〕
本発明は、密閉形の冷凍機や空調機の電動機に
好適に用いられる、耐冷媒性に優れた電動機コイ
ルおよびその製造方法に関するものである。
〔従来の技術〕
従来、この種の用途に用いられる高圧電動機の
コイルは、酸無水物（他官能の無水カルボン酸）
を硬化剤とするエポキシ樹脂によつて絶縁処理さ
れるのが一般的であつた。
このような電動機コイルは次のように製造され
ていた。まず、導体巻線に絶縁基材としてマイカ
テープを巻き回した後、漏れ止め処理し、これを
鉄芯のスロツトに挿入する。ついで、そのコイル
結線部にも同様にマイカテープを巻き、漏れ止め
処理した後、このものを真空乾燥する。ついでこ
れを硬化剤として酸無水物が配合されたエポキシ
樹脂組成物により真空含浸して加圧し、ついで含
浸されたエポキシ樹脂を加熱硬化させる（いわゆ
る全含浸法）。
この用途に使用するマイカテープは、裏打材と
のバインダーとして、硬化性を有している接着剤
を使用したものであつた。
〔発明が解決しようとする問題点〕
従来の電動機コイルにあつては、次のような問
題があつた。
密閉形冷凍機等にあつては、電動機が冷媒中で
運転されるため、電動機のコイルは冷媒にさらさ
れている。従つて、電動機のコイルの絶縁層は冷
媒による絶縁性の劣化が生じないものである必要
がある。
ところが、上記従来の電動機コイルの絶縁層
は、酸無水物を硬化剤としたエポキシ樹脂で絶縁
処理されているので、エネルギ効率が高い冷媒と
評価されているモノクロロジフルオロメタン（Ｒ
−22）に対しては、耐冷媒性が不足している。
このＲ−22中で上記従来の電動機コイルを用い
ると、コイルの絶縁層がＲ−22によつて軟化され
て徐々に溶解し絶縁性能の低下を招く。また、溶
解した樹脂が冷凍機の吐出弁や循環系器管に付着
して、装置の運転に支障を生じる。
このような問題には、耐冷媒（Ｒ−22）性の良
い芳香族アミン硬化剤やシアノエチル基を置換し
ていないイミダゾール化合物を配合したエポキシ
樹脂で絶縁処理することによつても対処できる
が、これらのエポキシ組成物はポツトライフが短
いために、多量のエポキシ組成物の中にコイルを
浸漬して処理する全含浸絶縁法では、エポキシ樹
脂組成物を繰返して含浸処理に使用することがで
きず、エポキシ樹脂組成物の使用効率が悪かつ
た。
このため、従来のエポキシ組成物では、真空含
浸処理を必要とする高電圧密閉型冷凍機用コイル
等には使用し難い問題があつた。
また、上記従来の電動機コイルの絶縁層に使用
されるマイカテープのバインダーにも、耐冷媒性
が要求されるために、従来は耐冷媒性の良い芳香
族アミン硬化剤やイミダゾール化合物を配合した
エポキシ樹脂をバインダーとして使用していた。
このため、マイカテープの保存中にバインダー
の硬化反応が進行し、極めて短い期間に可撓性が
なくなつてしまい、マイカテープの巻回作業が困
難になつてしまつていた。
つまり、マイカテープの保存安定性が著しく劣
つていた。
〔問題点を解決するための手段〕
本発明の耐冷媒性電動機コイルは、エポキシ樹
脂に硬化剤として第２級アミン官能基をシアノエ
チル基で置換したイミダゾール化合物と反応性希
釈剤を配合した無溶剤型エポキシ樹脂組成物によ
り真空含浸絶縁処理されたことを特徴とするもの
である。
本発明の製造方法は、導体巻線に硬化剤を含ま
ないエポキシ樹脂をバインダーとしたマイカテー
プを巻き回し、次いでこれを鉄芯に収容して接続
し、次いでこのものに上記無溶剤型エポキシ樹脂
組成物を含浸処理し、ついでこのものを加熱硬化
させて耐冷媒性電動機コイルを製造する方法であ
る。
以下、本発明について詳しく説明する。
コイルの絶縁層に含浸する無溶剤型エポキシ樹
脂組成物を構成するエポキシ樹脂としては、溶剤
を含まない無溶剤エポキシ樹脂が用いられ、これ
にはビスフエノールＡ形やビスフエノールＦ形の
エポキシ樹脂などが好適に用いられ、その中でも
常温で液状のものが利用し易い。そのようなエポ
キシ樹脂としては、エピコート828、827、807（商
品名；油化シエル社勢）などがある。また、この
無溶剤エポキシ樹脂には、脂環式エポキシ樹脂、
水添ビスフエノールＡ形エポキシ樹脂などを用い
ることもできる。さらに、これらにフエノールノ
ボラツクエポキシ樹脂やクレゾールノボラツクエ
ポキシ樹脂などを適当量混合したものを用いるこ
ともできる。イミダゾール化合物としては、上記
エポキシ樹脂との相溶性が良くポツトライフが長
い点で、イミダゾール環中の第２級アミン官能基
を不活性のシアノエチル基で置換した１−シアノ
エチル−２−メチルイミダゾール、１−シアノエ
チル−２−フエニル−４，５−ジ（シアノエトキ
シメチル）イミダゾールなどが好適に用いられる
が、中でも１−シアノエチル−２−フエニルイミ
ダゾールが特に好適に用いられる。
また、反応性希釈剤としては、沸点が高く蒸気
圧が低い点で、ａ−ジメチルグリシジエルエステ
ル（カージユラＥ、油化シエル社製）、フエニル
グリシジエルエーテル（エピオールＰ、日本油脂
社製）、ブタンジオール、ジグリシジエルエーテ
ル、ビニルシクロヘキサンジオキサイドなどが好
適に用いられる。
このような組成のエポキシ樹脂組成物は、液状
のものとなるが、その粘度が25℃で５ポイズ程度
であることが望ましい。この粘度の調整は上記反
応性希釈剤の配合量を調節することで行われる。
マイカテープには、ガラスクロスやポリエステ
ルフイルム、ポリイミドフイルム等を裏打材とし
たものが用いられる。
そのバインダーには、従来、硬化剤や硬化触媒
等を配合したエポキシ樹脂が用いられていたが、
本発明の製造方法によればマイカテープのバイン
ダーにはこれら硬化剤等を含有しないエポキシ基
本樹脂単独のものを用いている。
次に電動機コイルの製造方法について説明す
る。
まず従来と同様に導体巻線を製造し、ついでこ
の巻線にマイカテープを巻き回す。マイカテープ
には上述のごとく硬化剤を含まないエポキシ樹脂
をバインダーとし、ガラスクロス等を裏打材とし
たものが用いられる。
次に、このマイカテープが巻き回されたもの
に、必要は漏れ止め処理を行つた後、鉄芯に収容
して接続する。
この後、このものを無溶剤型エポキシ樹脂組成
物により真空加圧含浸させる。
次に、上記含浸処理により導体巻線やマイカテ
ープに含浸されたエポキシ樹脂は、加熱処理によ
つて重合されて絶縁層が形成される。
〔作用〕
本発明の電動機コイルにあつては、含浸処理に
用いられた無溶剤型エポキシ樹脂組成物に含まれ
ているイミダゾール化合物が、マイカテープのバ
インダーに対して硬化剤として作用し、絶縁層を
形成しているので、絶縁層は耐冷媒性に優れたも
のとなる。従つて、この電動機コイルはＲ−22等
の溶剤的作用の強い冷媒中で用いられても、絶縁
層が溶解したり軟化したりすることがない。
また、上記第２級アミン官能基をシアノエチル
基で置換したイミダゾール化合物が硬化剤として
配合されてなる無溶剤型エポキシ樹脂組成物は、
ポツトライフが十分長いので、本発明の製造方法
によれば真空含浸処理が不可欠な大形の高電圧電
動機コイルでも無溶剤型エポキシ樹脂組成物がむ
だなく利用できる。
さらに、本発明の電動機コイルの製造方法によ
れば、硬化剤に第２級アミン官能基をシアノエチ
ル基で置換したイミダゾール化合物を用いるの
で、エポキシ樹脂組成物は好適な硬化特性を有し
たものとなる。また、本発明の電動機コイルの製
造方法によれば、マイカテープのバインダーには
硬化剤を含まないエポキシ樹脂を使用しているの
で、マイカテープの保存安定性を向上できる。
〔実施例〕
以下、実施例に沿つて本発明の電動機コイルと
その製造方法を詳しく説明する。
実施例 １
第１表に示す配合の樹脂組成物を第１図に示す
ヘリカルコイル１にワニス処理し、最適な硬化条
件で加熱硬化させて試料を作成した。これら各試
料について耐冷媒性を調べた。ヘリカルコイル１
は直径１mmのアルミニウムによつて作成し、その
長さは70mm、内径は10mmであつた。
耐冷媒性の比較は、Ｒ−22に対する溶解性を間
接的に知ることができるスクリーニング試験とし
て一般的に行われるメタノール抽出試験によつて
行つた。このメタノール抽出試験は、メタノール
を抽出液として、ソツクスレー抽出器により４〜
６サイクル／時間の還流サイクルで４時間煮沸し
て、メタノール抽出量を測定する試験方法であ
る。またこの抽出試験に合わせて、抽出試験後の
各試料について曲げ強度を測定した。結果を第２
表に示す。
第２表の結果から、本発明の電動機コイルの絶
縁処理に使用する無溶剤型エポキシ樹脂組成物
（No.１およびNo.２）は、メタノール抽出量が少な
く、また、抽出試験後の曲げ強度が強く、軟化せ
ず接着力も優れていることが判明し、耐Ｒ−22性
に優れているものであることが確認できた。
これに対して、従来の電動機コイルの絶縁層を
なしていた、酸無水物を硬化剤とするエポキシ樹
脂（No.７、８）は、メタノール抽出量が多く、し
かも軟化するため曲げ強度も著しく低く、Ｒ−22
に対する耐性の劣るものであつた。また、比較的
耐冷媒性に優れていると評価されていた芳香族ア
ミンを硬化剤とするエポキシ樹脂組成物（No.８）
に比較しても、本発明の電動機コイルに用いられ
る無溶剤型エポキシ樹脂組成物は優れた耐冷媒性
を有していることが判明した。
実施例 ２
本発明の電動機コイルを以下のように作成し、
Ｒ−22に対する耐性を調べた。
素線絶縁を施した導体巻線にマイカテープを巻
き回し、その表面に無溶剤型エポキシ樹脂組成物
の流出を防止するために耐Ｒ−22性のワニスクロ
ステープを巻いた。
マイカテープには、ガラスクロスを裏打材とし
たものと、ポリエステルフイルムを裏打材とした
ものを用い、また、マイカテープのバインダーに
は、潜在性硬化剤や硬化促進材を含まない、エポ
キシ基本樹脂のみのもの（エピコート828；油化
シエル社製）を用いた。また、バインダーの含有
量は数〜10重量％であつた。
次いで、ワニスクロステープが巻き回された導
体巻線を80℃、１mmHgの条件で真空乾燥した。
ついで一度常圧に戻した後、このものも無溶剤型
エポキシ樹脂組成物に真空加圧含浸した。加圧は
５Kg／cm2で行つた。無溶剤型エポキシ樹脂組成物
には、上記第１表のNo.１とNo.２のものを用いた。
このように含浸処理したものを、100℃で３時間、
150℃で10時間加熱処理して無溶剤型エポキシ樹
脂組成物を硬化せしめ、絶縁処理されたコイルを
製造した。
このコイルを、約10mmの幅に輪切りして試料を
作成した。この試料を耐圧ガラス連結管に入れ、
Ｒ−22と共に封入した。このものを温度サイクル
試験に供して、Ｒ−22に抽出される樹脂分の量を
調べた。温度サイクルは、90℃×８時間、常温放
置16時間を１サイクルとして、これを14サイクル
行つた。
結果を第３表に示す。
[Industrial Field of Application] The present invention relates to a motor coil with excellent refrigerant resistance, which is suitably used in the motor of a hermetic refrigerator or air conditioner, and a method of manufacturing the same. [Prior art] Conventionally, the coils of high-voltage motors used for this type of application are made of acid anhydride (other functional carboxylic acid anhydride).
It was common for the insulation to be treated with epoxy resin using a curing agent. Such motor coils were manufactured as follows. First, mica tape is wound around the conductor winding as an insulating base material, treated to prevent leakage, and then inserted into the slot of the iron core. Next, the coil connection portion is similarly wrapped with mica tape to prevent leakage, and then vacuum dried. Next, this is vacuum impregnated with an epoxy resin composition containing an acid anhydride as a curing agent and pressurized, and then the impregnated epoxy resin is heated and cured (so-called total impregnation method). The mica tape used for this purpose used a curable adhesive as a binder with the backing material. [Problems to be Solved by the Invention] Conventional motor coils have had the following problems. In a hermetic refrigerator or the like, the motor is operated in a refrigerant, so the coils of the motor are exposed to the refrigerant. Therefore, it is necessary that the insulating layer of the motor coil is not deteriorated in insulation by the refrigerant. However, the insulating layer of the conventional motor coil is insulated with epoxy resin that uses acid anhydride as a hardening agent, so monochlorodifluoromethane (R
-22), the refrigerant resistance is insufficient. When the above conventional motor coil is used in this R-22, the insulating layer of the coil is softened by the R-22 and gradually melts, resulting in a decrease in insulation performance. Furthermore, the melted resin adheres to the discharge valve of the refrigerator and the circulatory system tubes, causing problems in the operation of the apparatus. Such problems can also be addressed by insulating the material with an epoxy resin containing an aromatic amine curing agent with good resistance to refrigerants (R-22) and an imidazole compound that does not substitute cyanoethyl groups. Because these epoxy compositions have a short pot life, the epoxy resin composition cannot be repeatedly used for impregnation treatment in the total impregnation insulation method in which the coil is immersed in a large amount of epoxy composition. The epoxy resin composition was used inefficiently. For this reason, conventional epoxy compositions have had the problem of being difficult to use in high-voltage hermetic refrigerator coils, etc., which require vacuum impregnation treatment. Furthermore, the binder of the mica tape used for the insulating layer of the conventional motor coils mentioned above is also required to be resistant to refrigerants. Resin was used as a binder. For this reason, the curing reaction of the binder progresses while the mica tape is stored, and the tape loses its flexibility in an extremely short period of time, making it difficult to wind the mica tape. In other words, the storage stability of the mica tape was extremely poor. [Means for Solving the Problems] The refrigerant-resistant motor coil of the present invention is a solvent-free epoxy resin containing an imidazole compound in which a secondary amine functional group is substituted with a cyanoethyl group as a curing agent and a reactive diluent. It is characterized by being vacuum impregnated and insulated with a type epoxy resin composition. The manufacturing method of the present invention involves winding a mica tape with a binder made of epoxy resin that does not contain a hardening agent around the conductor winding, then housing and connecting it to an iron core, and then applying the above-mentioned solvent-free epoxy resin to the conductor winding. In this method, a refrigerant-resistant motor coil is manufactured by impregnating a composition and then heating and curing the composition. The present invention will be explained in detail below. The epoxy resin constituting the solvent-free epoxy resin composition that is impregnated into the insulating layer of the coil is a solvent-free epoxy resin that does not contain a solvent, such as bisphenol A type or bisphenol F type epoxy resin. are preferably used, and among them, those that are liquid at room temperature are easy to use. Examples of such epoxy resins include Epicote 828, 827, and 807 (trade name; manufactured by Yuka Ciel Corporation). In addition, this solvent-free epoxy resin includes alicyclic epoxy resin,
Hydrogenated bisphenol A type epoxy resin and the like can also be used. Furthermore, a mixture of these with appropriate amounts of phenol novolac epoxy resin, cresol novolac epoxy resin, etc. can also be used. Imidazole compounds include 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-methylimidazole, which has a secondary amine functional group in the imidazole ring substituted with an inert cyanoethyl group, and has good compatibility with the epoxy resin and long pot life. Cyanoethyl-2-phenyl-4,5-di(cyanoethoxymethyl)imidazole and the like are preferably used, and among them, 1-cyanoethyl-2-phenylimidazole is particularly preferably used. In addition, as reactive diluents, which have a high boiling point and a low vapor pressure, a-dimethyl glycidyl ester (Cardilla E, manufactured by Yuka Shell Co., Ltd.) and phenyl glycidyl ether (Epiol P, manufactured by NOF Corporation) are used. , butanediol, diglycidyl ether, vinylcyclohexane dioxide, and the like are preferably used. The epoxy resin composition having such a composition is liquid, and it is desirable that the viscosity thereof be about 5 poise at 25°C. The viscosity is adjusted by adjusting the amount of the reactive diluent. The mica tape used has a backing material such as glass cloth, polyester film, or polyimide film. Conventionally, epoxy resins containing curing agents, curing catalysts, etc. have been used as binders.
According to the manufacturing method of the present invention, an epoxy basic resin alone that does not contain these curing agents is used as the binder of the mica tape. Next, a method for manufacturing the motor coil will be explained. First, a conductor winding is manufactured in the same manner as before, and then mica tape is wound around this winding. As described above, mica tape is made of an epoxy resin that does not contain a curing agent as a binder and a backing material such as glass cloth. Next, this mica tape is wound and, if necessary, subjected to leak-proofing treatment, and then housed in an iron core and connected. Thereafter, this material is impregnated with a solvent-free epoxy resin composition under vacuum and pressure. Next, the epoxy resin impregnated into the conductor winding and mica tape by the above-mentioned impregnation treatment is polymerized by heat treatment to form an insulating layer. [Function] In the motor coil of the present invention, the imidazole compound contained in the solvent-free epoxy resin composition used for the impregnation treatment acts as a curing agent for the binder of the mica tape, and the insulating layer , the insulating layer has excellent refrigerant resistance. Therefore, even if this motor coil is used in a refrigerant with a strong solvent action such as R-22, the insulating layer will not melt or soften. In addition, a solvent-free epoxy resin composition in which the above-mentioned imidazole compound in which the secondary amine functional group is substituted with a cyanoethyl group is blended as a curing agent,
Since the pot life is sufficiently long, according to the manufacturing method of the present invention, the solvent-free epoxy resin composition can be used without waste even in large-sized high-voltage motor coils that require vacuum impregnation treatment. Further, according to the method for producing a motor coil of the present invention, since an imidazole compound in which a secondary amine functional group is substituted with a cyanoethyl group is used as a curing agent, the epoxy resin composition has suitable curing characteristics. . Further, according to the method for manufacturing a motor coil of the present invention, since an epoxy resin containing no curing agent is used as the binder of the mica tape, the storage stability of the mica tape can be improved. [Example] Hereinafter, the motor coil of the present invention and its manufacturing method will be described in detail with reference to Examples. Example 1 A sample was prepared by applying a varnish treatment to the helical coil 1 shown in FIG. 1 with a resin composition having the formulation shown in Table 1, and heating and curing it under optimal curing conditions. The refrigerant resistance of each of these samples was investigated. helical coil 1
was made of aluminum with a diameter of 1 mm, its length was 70 mm, and its inner diameter was 10 mm. Comparison of refrigerant resistance was carried out by a methanol extraction test, which is generally performed as a screening test that indirectly determines the solubility in R-22. This methanol extraction test was conducted using a Soxhlet extractor using methanol as the extraction liquid.
This is a test method in which the amount of methanol extracted is measured by boiling for 4 hours in a reflux cycle of 6 cycles/hour. In addition to this extraction test, the bending strength of each sample after the extraction test was measured. Second result
Shown in the table. From the results in Table 2, it can be seen that the solvent-free epoxy resin compositions (No. 1 and No. 2) used for insulation treatment of motor coils of the present invention have a small amount of methanol extracted, and have a high bending strength after the extraction test. It was found that the adhesive was strong, did not soften, and had excellent adhesive strength, and was confirmed to have excellent R-22 resistance. On the other hand, the epoxy resins (No. 7 and 8) that use acid anhydride as a hardening agent, which were used to form the insulation layer of conventional motor coils, have a large amount of methanol extracted, and because they soften, their bending strength is also significant. Low, R-22
It had poor resistance to In addition, an epoxy resin composition (No. 8) using an aromatic amine as a curing agent, which was evaluated as having relatively excellent refrigerant resistance.
It has been found that the solvent-free epoxy resin composition used in the motor coil of the present invention has excellent refrigerant resistance even when compared to the above. Example 2 A motor coil of the present invention was created as follows,
Resistance to R-22 was investigated. A mica tape was wound around the conductor winding with wire insulation, and an R-22 resistant varnish cloth tape was wrapped around the surface of the mica tape to prevent the solvent-free epoxy resin composition from flowing out. The mica tape uses glass cloth as a backing material and polyester film as a backing material.The binder of the mica tape is an epoxy base resin that does not contain latent curing agents or curing accelerators. (Epicote 828; manufactured by Yuka Ciel Co., Ltd.) was used. Moreover, the binder content was several to 10% by weight. Next, the conductor winding around which the varnish cloth tape was wound was vacuum dried at 80° C. and 1 mmHg.
After returning to normal pressure, this material was also impregnated with a solvent-free epoxy resin composition under vacuum and pressure. Pressure was applied at 5 kg/cm 2 . The solvent-free epoxy resin compositions No. 1 and No. 2 in Table 1 above were used.
The impregnated material was heated at 100℃ for 3 hours.
The solvent-free epoxy resin composition was cured by heat treatment at 150° C. for 10 hours, and an insulated coil was manufactured. Samples were prepared by cutting this coil into rings with a width of about 10 mm. Put this sample into a pressure-resistant glass connecting tube,
It was enclosed together with R-22. This product was subjected to a temperature cycle test to determine the amount of resin extracted into R-22. The temperature cycle consisted of 90° C. x 8 hours and 16 hours of standing at room temperature, and 14 cycles were performed. The results are shown in Table 3.
【表】
＊ 絶縁層をなす樹脂分に対する抽出量
第３表の結果から、本発明の電動機コイルに
は、Ｒ−22にさらされても絶縁層から抽出される
樹脂分が極めて少なく、絶縁層に軟化、膨潤など
の異常は発生しないことが判る。そして、無溶剤
型エポキシ樹脂組成物は、いずれもマイカテープ
に浸透してバインダーと一体硬化し、耐Ｒ−22性
の優れた絶縁層を形成していることが判明した。
実施例 ３
ポリエステルフイルムを裏打材としたマイカテ
ープ（バインダー量；約６重量％）と、実施例１
の第１表に示した無溶剤型エポキシ樹脂組成物No.
２を用いて、実施例２と同様の方法でコイルを製
作した。
このコイルを、Ｒ−22と冷凍機用潤滑剤が50：
50の重量比で封入されたオートクレーブ中にセツ
トした。コイルに通電してオートクレーブ内を90
℃にする加熱を24時間、通電休止を24時間、これ
を１サイクルとして、20サイクル（40日間）試験
した。
この試験の前後で、tanδ−電圧特性、Δtanδお
よび絶縁抵抗を調べた。結果を第２図および第４
表に示す。[Table] * Amount extracted from the resin component forming the insulating layer From the results in Table 3, it is clear that even when the motor coil of the present invention is exposed to R-22, the resin component extracted from the insulating layer is extremely small. It can be seen that no abnormalities such as softening or swelling occur. It was also found that all of the solvent-free epoxy resin compositions penetrated into the mica tape and cured together with the binder, forming an insulating layer with excellent R-22 resistance. Example 3 Mica tape with polyester film as backing material (binder amount: approximately 6% by weight) and Example 1
Solvent-free epoxy resin composition No. shown in Table 1.
A coil was manufactured in the same manner as in Example 2 using No. 2. This coil was mixed with 50% R-22 and refrigerator lubricant:
It was set in an autoclave sealed at a weight ratio of 50. 90 degrees inside the autoclave by energizing the coil.
A test was conducted for 20 cycles (40 days), with one cycle consisting of 24 hours of heating to ℃ and 24 hours of stopping the current supply. Before and after this test, tanδ-voltage characteristics, Δtanδ, and insulation resistance were examined. The results are shown in Figures 2 and 4.
Shown in the table.
【表】
上記の結果から、本発明の電動機コイルはＲ−
22と潤滑剤の混合液にさらされてもほとんど電気
的特性の劣化がなく、実用上も全く問題無いこと
が確認できた。
実施例 ４
第１表中実施例No.１、No.２の無溶剤型エポキシ
樹脂組成物と比較例No.５およびNo.８のエポキシ樹
脂組成物を30℃にて保存し、粘度が10ポイズにな
るまでの日数（ポツトライフ）を調べた。結果を
第５表に示す。この結果から第２級アミン官能基
をシアノエチル基で置換したイミダゾール化合物
を硬化剤とした無溶剤型エポキシ樹脂組成物No.
１、No.２のものはポツトライフが長いことが判明
した。[Table] From the above results, the motor coil of the present invention has R-
It was confirmed that there was almost no deterioration in electrical characteristics even when exposed to a mixture of No. 22 and lubricant, and there was no problem in practical use. Example 4 The solvent-free epoxy resin compositions of Examples No. 1 and No. 2 and the epoxy resin compositions of Comparative Examples No. 5 and No. 8 in Table 1 were stored at 30°C, and the viscosity was 10. We investigated the number of days until it becomes poisonous (pot life). The results are shown in Table 5. Based on these results, solvent-free epoxy resin composition No. 1 was prepared using an imidazole compound in which the secondary amine functional group was substituted with a cyanoethyl group as a curing agent.
It was found that No. 1 and No. 2 had a long pot life.
以上説明したように、この発明の電動機コイル
は、第２級アミン官能基をシアノエチル基で置換
したイミダゾール化合物を硬化剤とした無溶剤型
エポキシ樹脂組成物によつて絶縁処理されている
ので、溶剤的作用の強い冷媒Ｒ−22に対しても優
れた耐冷媒性を有している。従つて、この発明の
電動機コイルは、冷媒にＲ−22を用いる密閉形冷
凍機等に使用されても、冷媒Ｒ−22に侵されて絶
縁層が溶解して絶縁低下を来したり、冷凍機の循
環系器管が閉鎖するなどの事故を生じることがな
い。また、本発明の電動機コイルはＲ−22やその
他各種のフロン冷媒中で良好な絶縁性能を発揮す
る。
また、本発明のコイルで用いた無溶剤型エポキ
シ樹脂組成物は第５表に示すごとく、芳香族アミ
ンを硬化剤とした無溶剤エポキシ樹脂組成物に比
較して、ポツトライフが十分長いので、真空含浸
が不可欠な高電圧コイルの製造も可能で、大形高
電圧冷凍機の冷媒のＲ−22化を図ることができ
る。
この製造方法により高圧用電動機コイルを製作
する場合、マイカテープのバインダーには硬化剤
を含まないエポキシ樹脂を使用しているので、マ
イカーテープの保存安定性を図ることができる。
またさらに、反応性希釈剤が配合されているの
で、無溶剤型エポキシ樹脂組成物の粘度が低く、
含浸処理が容易に行え、かつ真空含浸処理によつ
ても、反応性希釈剤が蒸発して粘度が上昇する不
都合もない。
すなわち、第１の発明の耐冷媒性電動機コイル
においては、絶縁層を形成するエポキシ樹脂組成
物として、第２級アミン官能基をシアノエチル基
で置換したイミダゾール化合物を硬化剤としたも
のを用いた。このタイプのエポキシ樹脂組成物
は、第５表から明らかであるように、ポツトライ
フが十分長い。従つて第１の発明の耐冷媒性電動
機コイルは、多量のエポキシ樹脂組成物中にコイ
ルを浸漬して処理する必要のある真空含浸絶縁法
でコイルの絶縁処理を行うことにより製造して
も、浸漬浴中のエポキシ樹脂組成物を長期間、繰
り返し使用でき、エポキシ樹脂を効率良く使用で
きる。よつて第１発明の耐冷媒性電動機コイルに
よれば、真空含浸処理が必要な高電圧コイルの製
造も可能となる。
またこの第１発明の耐冷媒性電動機コイルで
は、エポキシ樹脂として無溶剤エポキシ樹脂を用
いたので、耐冷媒性に優れている利点がある。
第２発明の製造方法では、硬化剤を含まないエ
ポキシ樹脂をバインダーとしたマイカテープを導
体巻線に巻き回し、次いでこのものに第２級アミ
ン官能基をシアノエチル基で置換したイミダゾー
ル化合物を硬化剤としたエポキシ樹脂を含浸処理
し、次いでこのものを加熱硬化するので、カイカ
テープのバインダーの硬化は、後に含浸処理され
るエポキシ樹脂組成物中の硬化剤によつて行われ
る。従つてこの製造方法によれば、マイカテープ
のエポキシ樹脂が保存中に硬化することがなく、
マイカテープの保存安定性が大幅に向上する。
As explained above, the motor coil of the present invention is insulated with a solvent-free epoxy resin composition using an imidazole compound in which the secondary amine functional group is substituted with a cyanoethyl group as a curing agent. It has excellent refrigerant resistance even against the aggressive refrigerant R-22. Therefore, even if the motor coil of the present invention is used in a hermetic refrigerator or the like that uses R-22 as a refrigerant, the insulating layer may melt due to being attacked by the refrigerant R-22, causing insulation deterioration, or the refrigeration There will be no accidents such as closure of the circulatory system of the machine. Further, the motor coil of the present invention exhibits good insulation performance in R-22 and various other fluorocarbon refrigerants. Furthermore, as shown in Table 5, the solvent-free epoxy resin composition used in the coil of the present invention has a sufficiently long pot life compared to the solvent-free epoxy resin composition using aromatic amine as a curing agent. It is also possible to manufacture high-voltage coils that require impregnation, and it is possible to use R-22 as the refrigerant for large-scale high-voltage refrigerators. When manufacturing a high-voltage motor coil using this manufacturing method, the storage stability of the mica tape can be improved because an epoxy resin that does not contain a curing agent is used as the binder of the mica tape.
Furthermore, since a reactive diluent is blended, the viscosity of the solvent-free epoxy resin composition is low.
The impregnation process can be easily performed, and even when the vacuum impregnation process is performed, there is no inconvenience that the reactive diluent evaporates and the viscosity increases. That is, in the refrigerant-resistant motor coil of the first invention, the epoxy resin composition forming the insulating layer uses an imidazole compound in which the secondary amine functional group is substituted with a cyanoethyl group as a curing agent. This type of epoxy resin composition has a sufficiently long pot life, as is clear from Table 5. Therefore, even if the refrigerant-resistant motor coil of the first invention is manufactured by insulating the coil using a vacuum impregnation insulation method that requires immersing the coil in a large amount of epoxy resin composition, The epoxy resin composition in the immersion bath can be used repeatedly for a long period of time, and the epoxy resin can be used efficiently. Therefore, according to the refrigerant-resistant motor coil of the first invention, it is also possible to manufacture a high voltage coil that requires vacuum impregnation treatment. Further, in the refrigerant-resistant motor coil of the first invention, since a solvent-free epoxy resin is used as the epoxy resin, it has the advantage of excellent refrigerant resistance. In the manufacturing method of the second invention, a mica tape whose binder is an epoxy resin that does not contain a curing agent is wound around a conductor winding, and then an imidazole compound in which a secondary amine functional group is replaced with a cyanoethyl group is applied as a curing agent. Since the epoxy resin is impregnated and then heated and cured, the binder of the Kaica tape is cured by the curing agent in the epoxy resin composition that is subsequently impregnated. Therefore, according to this manufacturing method, the epoxy resin of the mica tape does not harden during storage.
The storage stability of mica tape is greatly improved.
【表】【table】
【表】【table】
【表】【table】
第１図は実施例１で用いられたヘリカルコイル
を示す平面図、第２図は実施例３で得られたtanδ
−電圧の関係を示すグラフである。
Figure 1 is a plan view showing the helical coil used in Example 1, and Figure 2 is the tanδ obtained in Example 3.
- is a graph showing the relationship between voltages.
Claims (1)
能基をシアノエチル基で置換したイミダゾール化
合物と反応性希釈剤を配合した無溶剤型エポキシ
樹脂組成物により、真空含浸絶縁処理されたこと
を特徴とする耐冷媒性電動機コイル。 ２ 導体巻線に硬化剤を含まないエポキシ樹脂を
バインダーとしたマイカテープを巻き回し、次い
でこれを鉄芯に収容したのち、このものに、エポ
キシ樹脂に硬化剤として第２級アミン官能基をシ
アノエチル基で置換したイミダゾール化合物と反
応性希釈剤を配合した無溶剤型エポキシ樹脂組成
物を含浸処理し、次いでこのものを加熱硬化させ
ることを特徴とする耐冷媒性電動機コイルの製造
方法。[Claims] 1. Vacuum impregnation insulation treatment is performed using a solvent-free epoxy resin composition containing an epoxy resin as a curing agent, an imidazole compound in which a secondary amine functional group is substituted with a cyanoethyl group, and a reactive diluent. A refrigerant-resistant motor coil characterized by: 2 Mica tape with an epoxy resin binder that does not contain a hardening agent is wound around the conductor winding, and then this is housed in an iron core. A method for manufacturing a refrigerant-resistant motor coil, which comprises impregnating a solvent-free epoxy resin composition containing a group-substituted imidazole compound and a reactive diluent, and then heating and curing the composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16156386A JPS6318937A (en) | 1986-07-09 | 1986-07-09 | Refrigerant-proof motor coil and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16156386A JPS6318937A (en) | 1986-07-09 | 1986-07-09 | Refrigerant-proof motor coil and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6318937A JPS6318937A (en) | 1988-01-26 |
| JPH0477540B2 true JPH0477540B2 (en) | 1992-12-08 |
Family
ID=15737490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16156386A Granted JPS6318937A (en) | 1986-07-09 | 1986-07-09 | Refrigerant-proof motor coil and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6318937A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0749889B2 (en) * | 1988-04-27 | 1995-05-31 | 株式会社荏原製作所 | heat pump |
| JPH0556587A (en) * | 1991-08-20 | 1993-03-05 | Hitachi Chem Co Ltd | Manufacture of insulated refrigerator motor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59117447A (en) * | 1982-12-24 | 1984-07-06 | Hitachi Ltd | Treating method of coil of motor for refrigerator |
-
1986
- 1986-07-09 JP JP16156386A patent/JPS6318937A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59117447A (en) * | 1982-12-24 | 1984-07-06 | Hitachi Ltd | Treating method of coil of motor for refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6318937A (en) | 1988-01-26 |
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