JPH0691665A - Manufacture of electric apparatus - Google Patents

Manufacture of electric apparatus

Info

Publication number
JPH0691665A
JPH0691665A JP24325692A JP24325692A JPH0691665A JP H0691665 A JPH0691665 A JP H0691665A JP 24325692 A JP24325692 A JP 24325692A JP 24325692 A JP24325692 A JP 24325692A JP H0691665 A JPH0691665 A JP H0691665A
Authority
JP
Japan
Prior art keywords
filler
less
resin composition
urethane resin
castor oil
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.)
Granted
Application number
JP24325692A
Other languages
Japanese (ja)
Other versions
JP3227823B2 (en
Inventor
Masahiro Suzuki
雅博 鈴木
Eiji Omori
英二 大森
Katsuhiko Yasu
克彦 安
Mitsuo Obara
光雄 小原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Showa Denko Materials Co Ltd
Original Assignee
Hitachi Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Chemical Co Ltd filed Critical Hitachi Chemical Co Ltd
Priority to JP24325692A priority Critical patent/JP3227823B2/en
Publication of JPH0691665A publication Critical patent/JPH0691665A/en
Application granted granted Critical
Publication of JP3227823B2 publication Critical patent/JP3227823B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Insulating Of Coils (AREA)

Abstract

PURPOSE:To obtain a low-cost electric apparatus having excellent curability, crack resistance, flame retardance and thermal conductivity by filling special filler in a case for containing components, then transferring special urethane resin composition therein by special vacuum degree, and curing it. CONSTITUTION:A method for manufacturing an electric apparatus comprises the steps of first filling filler A having a mean particle size of 300mum or more in a case for containing components, then transferring urethane resin composition containing one or more of liquidlike polybutadiene series polyol, castor oil and castor oil ester exchange, polyisocyanate as well as filler B having a mean particle size of 100mum or less, a viscosity of the composition of 4Pa.s or less and flame resistance of the cured material of UL94V-2 or more (a thickness of a test piece of 5mm or less) in a vacuum degree of 100Torr or less, and curing it.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は電気機器の製造方法に関
し、さらに詳しくは熱伝導率、耐クラック性、硬化性、
はんだクラック性および難燃性に優れた電気機器の製造
方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an electric device, and more particularly, to thermal conductivity, crack resistance, curability,
The present invention relates to a method for manufacturing an electric device having excellent solder cracking property and flame retardancy.

【0002】[0002]

【従来の技術】従来、絶縁処理された電気機器は、プラ
スチックケースにコイル等の部品をセットし、これに樹
脂と無機フィラーの均一混合物を常圧または真空下で注
入して硬化するポッティング法によって製造されてい
る。しかし、この方法では作業性の面から混合する無機
フィラーの添加量に限界があるため、製品価格が高くな
る欠点がある。また樹脂組成物が硬化する際に体積収縮
を生じるため硬化物にクラックが生じ、内蔵されている
コイルおよび部品ケースに剥離やクラックが発生し易
く、さらに注型した硬化物の線膨脹率が大きいためヒー
トサイクル時に部品に熱応力が加わり故障の原因となり
易くなる。さらに熱伝導率が悪いために機器の温度が高
くなり、使用する温度が制限されるなどの問題がある。
さらに樹脂組成物と無機フィラーを混合して真空下で脱
泡した後に注入作業を行うため、樹脂組成物の硬化時間
の長いものを使用する必要があり、注入後の硬化時間が
長くなり、作業工程の合理化、省エネルギー化に限界が
ある。
2. Description of the Related Art Conventionally, insulation-treated electrical equipment is set by a potting method in which parts such as coils are set in a plastic case, and a uniform mixture of a resin and an inorganic filler is injected and cured under atmospheric pressure or vacuum. Being manufactured. However, in this method, there is a limit in the amount of the inorganic filler to be mixed from the viewpoint of workability, so that there is a drawback that the product price becomes high. Further, when the resin composition cures, volumetric shrinkage occurs, which causes cracks in the cured product, which easily causes peeling and cracks in the built-in coil and component case. Further, the linear expansion coefficient of the cured product cast is large. Therefore, thermal stress is applied to the component during the heat cycle, which easily causes a failure. Further, since the thermal conductivity is poor, the temperature of the device becomes high, and there is a problem that the temperature to be used is limited.
Further, since the injection work is performed after the resin composition and the inorganic filler are mixed and defoamed under vacuum, it is necessary to use one having a long curing time of the resin composition, the curing time after injection becomes long, and the work There are limits to the rationalization of processes and energy saving.

【0003】[0003]

【発明が解決しようとする課題】本発明は、前記従来技
術の欠点をなくし、硬化性、耐クラック性、難燃性、熱
伝導率に優れた電気機器の製造方法を提供するものであ
る。
DISCLOSURE OF THE INVENTION The present invention provides a method for manufacturing an electric device which eliminates the above-mentioned drawbacks of the prior art and is excellent in curability, crack resistance, flame retardancy and thermal conductivity.

【0004】[0004]

【課題を解決するための手段】本発明は、部品を収納し
たケース内に平均粒子径が300μm以上のフィラー
(A)を充填した後、液状ポリブタジエン系ポリオー
ル、ヒマシ油およびヒマシ油エステル交換物の一または
二以上、ポリイソシアネートならびに平均粒子径が10
0μm以下のフィラー(B)を含み、該組成物の粘度が
4Pa.s以下で、その硬化物の難燃性がUL94V−
2以上(試験片厚み5mm以下)であるウレタン樹脂組成
物を、100Torr以下の真空度で注入し、硬化させ
る電気機器の製造方法に関する。
According to the present invention, a liquid polybutadiene-based polyol, castor oil and castor oil transesterified product are prepared by filling a case (a) containing parts with a filler (A) having an average particle size of 300 μm or more. One or more, polyisocyanate and average particle size of 10
Including a filler (B) of 0 μm or less, and the viscosity of the composition is 4 Pa.s. s or less, the flame retardancy of the cured product is UL94V-
The present invention relates to a method for manufacturing an electric device in which a urethane resin composition having a thickness of 2 or more (test piece thickness of 5 mm or less) is injected at a vacuum degree of 100 Torr or less and cured.

【0005】本発明に用いられるフィラー(A)の平均
粒子径は300μm以上、好ましくは600〜1200
μmである。粒子径は、JIS Z 2602−197
6によって測定される。平均粒子径が300μm未満で
は、粒子が細かく、粒子間隙が小さいため、ウレタン樹
脂組成物の注入時に未含浸部が残り、熱伝導性が低下
し、絶縁性も損なわれる。また部品間にフィラー(A)
が不均一に充填され、機器全体の線膨脹率が不均一とな
り、ヒートサイクル時にコイルや部品の周辺に剥離クラ
ックが発生し、また基板のはんだ接合部にはんだクラッ
クが発生する。フィラー(A)としては、例えば硅砂、
シリカ、アルミナ、水和アルミナ、クレー、マイカ、ガ
ラスビーズ等が用いられ、特に種類の制限はない。市販
品では、パールサンド4号、三河硅砂V−3(トウチュ
ウ社製)、GB−B(東芝バロティーニ社製)、GRA
NUSIL(登録商標)19meshまたは20mes
h(UNIMIN社製)等を用いることができる。また
これらは併用することもできる。
The average particle size of the filler (A) used in the present invention is 300 μm or more, preferably 600 to 1200.
μm. The particle size is JIS Z 2602-197.
6 is measured. If the average particle diameter is less than 300 μm, the particles are fine and the gaps between the particles are small, so that the unimpregnated portion remains when the urethane resin composition is injected, and the thermal conductivity decreases and the insulating property also deteriorates. Filler (A) between parts
Are non-uniformly filled, the coefficient of linear expansion of the entire device becomes non-uniform, peeling cracks occur around the coil and parts during the heat cycle, and solder cracks occur at the solder joints of the board. Examples of the filler (A) include silica sand,
Silica, alumina, hydrated alumina, clay, mica, glass beads and the like are used, and the kind is not particularly limited. Commercially available products include Pearl Sand No. 4, Mikawa Sisand V-3 (manufactured by Tochu), GB-B (manufactured by Toshiba Ballotini), GRA.
NUSIL (registered trademark) 19 mesh or 20 mes
h (manufactured by UNIMIN) or the like can be used. These can also be used in combination.

【0006】本発明においては、ポリオール、ポリイソ
シアネートおよびフィラー(B)を含み、該組成物の粘
度が4Pa.s(パスカル・秒)以下で、その硬化物の
難燃性がUL94V−2以上(試験片厚み5mm以下)の
特性を有するウレタン樹脂組成物が用いられる。ウレタ
ン樹脂組成物の粘度が4Pa.sを超えると、フィラー
(A)への組成物の含浸性が低下して未含浸部が残り、
熱伝導性が低下する。またウレタン樹脂組成物を硬化さ
せたときの硬化物の難燃性がUL94V−2(試験片厚
み5mm以下)未満では機器の難燃性が維持できない。ウ
レタンン樹脂組成物の硬化物の硬さ〔ショアーA〕は、
50以下であることが好ましい。
In the present invention, a polyol, a polyisocyanate and a filler (B) are contained, and the viscosity of the composition is 4 Pa.s. A urethane resin composition having a characteristic of flame retardancy of UL94V-2 or more (test piece thickness of 5 mm or less) at s (Pascal · sec) or less is used. The viscosity of the urethane resin composition is 4 Pa.s. When it exceeds s, the impregnating property of the composition into the filler (A) is lowered and the unimpregnated part remains,
The thermal conductivity is reduced. If the flame retardancy of the cured product when the urethane resin composition is cured is less than UL94V-2 (test piece thickness of 5 mm or less), the flame retardancy of the equipment cannot be maintained. The hardness [Shore A] of the cured product of the urethane resin composition is
It is preferably 50 or less.

【0007】液状ポリブタジエン系ポリオール、ヒマシ
油またはヒマシ油エステル交換物が用いられるが、液状
ポリブタジエン系ポリオールとしては、分子量が700
〜8000、特に1000〜3000である1,4−ポ
リブタジエン系ポリオールが好ましい。この市販品とし
ては、例えば商品名Poly bd R−45HT、R
−45M(出光石油化学社製)などが挙げられる。また
ヒマシ油は、リシノール酸(1,2−ヒドロキシオレイ
ン酸)を主成分とするトリグリセライドであり、分子内
に約2.7の水酸基を有するものである。この市販品と
しては、URIC−H−28、CAO(伊藤製油社製)
等が挙げられる。またヒマシ油エステル交換物は、ヒマ
シ油と水酸基を実質上有しない天然油脂とのエステル交
換反応物であり、市販品として、例えば商品名URIC
Y−403、URIC H−31(伊藤製油社製)等
が挙げられる。この他に、例えばヘキサンジオール、エ
チレングリコール、ジエチレングリコール、プロピレン
グリコール、オクタンジオール、2−エチルヘキサンジ
オール、グリセリン、ペンタエリスリトール、トリメチ
ロールプロパンなどの低分子ポリオールを希釈剤として
併用することも可能である。
Liquid polybutadiene-based polyols, castor oil or castor oil transesterification products are used, and the liquid polybutadiene-based polyol has a molecular weight of 700.
The 1,4-polybutadiene-based polyol having a molecular weight of ˜8000, particularly 1000 to 3000 is preferable. As this commercial item, for example, trade name Poly bd R-45HT, R
-45M (made by Idemitsu Petrochemical Co., Ltd.) and the like. Castor oil is a triglyceride containing ricinoleic acid (1,2-hydroxyoleic acid) as a main component, and has a hydroxyl group of about 2.7 in the molecule. As this commercial item, URIC-H-28, CAO (made by Ito Oil Co., Ltd.)
Etc. The castor oil transesterification product is a transesterification product of castor oil and a natural fat or oil having substantially no hydroxyl group, and is commercially available, for example, under the trade name of URIC.
Y-403, URIC H-31 (made by Ito Oil Co., Ltd.), etc. are mentioned. In addition to this, it is also possible to use a low molecular weight polyol such as hexanediol, ethylene glycol, diethylene glycol, propylene glycol, octanediol, 2-ethylhexanediol, glycerin, pentaerythritol, or trimethylolpropane as a diluent.

【0008】本発明に用いられるポリイソシアネート
は、前記ポリオールの硬化剤として使用され、例えばト
リレンジイソシアネート、ジフェニルメタンジイソシア
ネート、ナフタレンジイソシアネート、キシリレンジイ
ソシアネート、ジフェニルスルホンジイソシアネート、
トリフェニルメタンジイソシアネート、ヘキサンメチレ
ンジイソシアネート、3−イソシアネートメチル−3,
5,5−トリメチルシクロヘキシルイソシアネート、3
−イソシアネートエチル−3,5,5−トリメチルシク
ロヘキシルイソシアネート、3−イソシアネートエチル
−3,5,5−トリエチルシクロヘキシルイソシアネー
ト、ジフェニルプロパンジイソシアネート、フェニレン
ジイソシアネート、シクロヘキシリレンジイソシアネー
ト、3,3′−ジイソシアネートジプロピルエーテル、
トリフェニルメタントリイソシアネート、ジフェニルエ
ーテル−4,4′−ジイソシアネートなどのポリイソシ
アネートまたは上記イソシアネートをフェノール類、オ
キシム類、イミド類、メルカプタン類、アルコール類、
ε−カプロラクタム、エチレンイミン、α−ピロリド
ン、マロン酸ジエチル、亜硫酸水素、ナトリウム、ホウ
酸等でブロック化したものなどが用いられる。これらは
単独でまたは2種類以上併用して用いられる。
The polyisocyanate used in the present invention is used as a curing agent for the above-mentioned polyols, for example, tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, xylylene diisocyanate, diphenyl sulfone diisocyanate,
Triphenylmethane diisocyanate, hexane methylene diisocyanate, 3-isocyanate methyl-3,
5,5-trimethylcyclohexyl isocyanate, 3
-Isocyanate ethyl-3,5,5-trimethylcyclohexyl isocyanate, 3-isocyanate ethyl-3,5,5-triethylcyclohexyl isocyanate, diphenylpropane diisocyanate, phenylene diisocyanate, cyclohexylylene diisocyanate, 3,3'-diisocyanate dipropyl ether,
Polyisocyanates such as triphenylmethane triisocyanate and diphenyl ether-4,4'-diisocyanate, or the above isocyanates are used as phenols, oximes, imides, mercaptans, alcohols,
Those blocked with ε-caprolactam, ethyleneimine, α-pyrrolidone, diethyl malonate, hydrogen sulfite, sodium, boric acid and the like are used. These may be used alone or in combination of two or more.

【0009】フィラー(B)の平均粒子径は、100μ
m以下、好ましくは50μm以下とされ、例えば結晶シ
リカ、溶融シリカ、アルミナ、酸化アルミナ、タルク、
炭酸カルシウム、マイカ、ガラスビーズ、水酸化マグネ
シウム、クレー等が用いられる。この市販品としては、
CRT−AA、CRT−D、RD−8(龍森社製商品
名)、C−303H、C−315H、C−308(住友
化学社製)、SL−700(竹原化学社製)等を用いる
ことができる。これらは併用することもできる。フィラ
ー(B)の平均粒子径が100μmを超えると組成物の
注入作業性および保管沈降性に劣る。
The average particle size of the filler (B) is 100 μm.
m or less, preferably 50 μm or less, for example, crystalline silica, fused silica, alumina, alumina oxide, talc,
Calcium carbonate, mica, glass beads, magnesium hydroxide, clay and the like are used. As this commercial product,
CRT-AA, CRT-D, RD-8 (trade name manufactured by Tatsumori Co., Ltd.), C-303H, C-315H, C-308 (manufactured by Sumitomo Chemical Co., Ltd.), SL-700 (manufactured by Takehara Chemical Co., Ltd.) and the like are used. be able to. These can also be used in combination. If the average particle diameter of the filler (B) exceeds 100 μm, the composition is poor in injection workability and storage sedimentation property.

【0010】ウレタン樹脂組成物には、水酸基を有しな
い可塑剤、例えばジオクチルフタレート、トリフェニル
ホスフェート、トリクレジルホスフェート、クレジルジ
フェニルホスフェート等のフタル酸エステル、リン酸エ
ステルなどを併用することができる。また必要に応じて
赤リン、ヘキサブロモベンゼン、ジブロモフェニルグリ
シジルエーテル、ジブロモクレジルグリシジルエーテ
ル、三酸化アンチモン等の難燃剤、ベンガラ、酸化第2
鉄、カーボン、チタンホワイト等の着色剤、シラン系カ
ップリング剤、シリコーン系消泡剤等の各種添加剤を配
合させることができる。
The urethane resin composition may be used in combination with a plasticizer having no hydroxyl group, for example, phthalic acid ester such as dioctyl phthalate, triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, phosphoric acid ester and the like. . In addition, if necessary, red phosphorus, hexabromobenzene, dibromophenyl glycidyl ether, dibromocresyl glycidyl ether, flame retardants such as antimony trioxide, red iron oxide, second oxide
Various additives such as colorants such as iron, carbon and titanium white, silane coupling agents, silicone defoaming agents and the like can be added.

【0011】本発明において、電気機器は、あらかじめ
フィラー(A)を充填した素子、基板、コイル、リード
線等の電気機器の部品を収納したケース内に、上記のウ
レタン樹脂組成物を真空度100Torr以下で注入し
て硬化させて得られる。真空度が100Torrを超え
ると、フィラー(A)へのウレタン樹脂組成物の含浸性
が低下し、熱伝導率が低下し、絶縁性が損なわれる。本
発明の方法により得られる電気機器は、ケース内のフィ
ラー(A)に樹脂組成物が均一に充分に含浸されている
ため、その硬化物には気泡がなく、素子、基板、コイ
ル、リード線等の電気機器の部品とよく密着し、従来の
ポッティング法と同様に優れた含浸性と密着性が得られ
る。本発明の適用される電気機器としては、高圧トラン
ス、電源トランス、イグナイター等があげられる。
In the present invention, the electric equipment is filled with the filler (A) in advance, and the urethane resin composition is placed in a case in which parts of the electric equipment such as an element, a substrate, a coil and a lead wire are housed, and the degree of vacuum is 100 Torr. Obtained by injecting and curing below. When the degree of vacuum exceeds 100 Torr, the impregnability of the urethane resin composition into the filler (A) is lowered, the thermal conductivity is lowered, and the insulating property is impaired. In the electric device obtained by the method of the present invention, since the filler (A) in the case is uniformly and sufficiently impregnated with the resin composition, the cured product has no bubbles, and the element, the substrate, the coil, and the lead wire. It adheres well to parts of electrical equipment such as the above, and provides excellent impregnation and adhesion as in the conventional potting method. Examples of electric equipment to which the present invention is applied include a high-voltage transformer, a power transformer, and an igniter.

【0012】また従来のポッティング法では、混合時の
粘度および注入作業性の点から、フィラー1.0に対す
る樹脂組成物の使用割合は重量比で0.4が限度である
が、本発明の方法によればフィラーの使用量を多くでき
るため、トータルコストの低減が可能であり、硬化時の
硬化収縮の低減、硬化物の熱伝導率およびヒートサイク
ル時の耐クラック性、難燃性の向上により電気機器の性
能の大幅な向上が図れる。
Further, in the conventional potting method, the ratio of the resin composition to the filler 1.0 is limited to 0.4 by weight in view of the viscosity at the time of mixing and the workability of injection. According to the method, since the amount of filler used can be increased, the total cost can be reduced, and the curing shrinkage at the time of curing can be reduced, and the thermal conductivity of the cured product, the crack resistance at the time of heat cycle, and the flame retardance can be improved. The performance of electric equipment can be greatly improved.

【0013】[0013]

【実施例】以下、本発明を実施例により説明するが、本
発明はこれらに制限されるものではない。なお、特性は
以下に示す方法で評価した。 (1)フィラー(A)の粒度分布:JIS Z 260
2−1976「鋳物砂の粒度分布試験方法」に準じて測
定した。 (2)粘度:B型回転粘度計を用い、測定温度25℃で
測定した。 (3)モデル含浸率:直径50mmのポリエチレン製ビー
カにフィラー(A)を加振しながら充填後秤量してフィ
ラー(A)の重量(W0 g)を求めた。次に樹脂組成物
を注入し、10Torrの減圧下で10分間放置し、常
圧、80℃で3時間硬化させた。次いでポリエチレン製
ビーカから硬化物を取出し、下部の樹脂組成物が含浸さ
れず硬化物から分離されるフィラー(A)の重量(W1
g)を求め、次式からモデル含浸率を算出した。
EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto. The characteristics were evaluated by the methods shown below. (1) Particle size distribution of filler (A): JIS Z 260
2-1976 "Measuring method of particle size distribution of foundry sand". (2) Viscosity: Measured at a measurement temperature of 25 ° C. using a B type rotational viscometer. (3) Model impregnation rate: The weight (W 0 g) of the filler (A) was obtained by weighing the filler (A) while vibrating the filler (A) in a polyethylene beaker having a diameter of 50 mm. Next, the resin composition was injected and left under reduced pressure of 10 Torr for 10 minutes, and then cured at 80 ° C. for 3 hours under normal pressure. Next, the cured product was taken out from the polyethylene beaker, and the weight of the filler (A) (W 1
g) was obtained and the model impregnation rate was calculated from the following equation.

【数1】 モデル含浸率は、樹脂組成物がフィラー(A)中に含浸
した割合を求めるものであり、未含浸部のフィラー
(A)が少なければモデル含浸率が高くなり、含浸性に
優れることを示す。
[Equation 1] The model impregnation rate is obtained by determining the rate of impregnation of the resin composition into the filler (A). If the filler (A) in the non-impregnated portion is small, the model impregnation rate becomes high, indicating that the impregnation property is excellent.

【0014】(4)電気機器への含浸性:コイル、素子
等の部品を、コイルのボビンと同一材質のケースに収納
し、90℃で1時間、乾燥した後、150℃のフィラー
(A)を加振しながら充填した。次にウレタン樹脂組成
物を10Torrの減圧下で注入した後、10Torr
/1分間放置し、常圧に戻して90℃で4時間硬化させ
た。次いで得られた電気機器を切断し、コイルおよび部
品間隙への含浸状態と、フィラー(A)に対するウレタ
ン樹脂組成物の含浸状態について観察し、次のように評
価した。 ○:コイルおよび部品の間隙に含浸し、かつフィラー
(A)にウレタン樹脂組成物が含浸している。 △:フィラー(A)にウレタン樹脂組成物の未含浸部分
が若干残る。 ×:フィラー(A)にウレタン樹脂組成物の未含浸部分
がかなり残る。 (5)硬さ:組成物20gを直径60mmの金属シャーレ
中に注入して硬化後、金属シャーレより硬化物を取出
し、25℃の測定温度でショアーA硬度計により測定し
た。
(4) Impregnating property in electric equipment: Parts such as coils and elements are housed in a case made of the same material as the coil bobbin, dried at 90 ° C. for 1 hour, and then filled with filler (A) at 150 ° C. Was shaken and filled. Next, after injecting the urethane resin composition under a reduced pressure of 10 Torr, 10 Torr
It was left standing for 1 minute, returned to normal pressure, and cured at 90 ° C. for 4 hours. Then, the obtained electric device was cut, and the impregnation state of the coil and the gap between the components and the impregnation state of the urethane resin composition with the filler (A) were observed and evaluated as follows. ◯: The gap between the coil and the component is impregnated, and the filler (A) is impregnated with the urethane resin composition. Δ: The unimpregnated portion of the urethane resin composition remains in the filler (A). X: A considerable part of the filler (A) not impregnated with the urethane resin composition remains. (5) Hardness: 20 g of the composition was poured into a metal petri dish having a diameter of 60 mm and cured, and then the cured product was taken out from the metal petri dish and measured with a Shore A hardness meter at a measurement temperature of 25 ° C.

【0015】(6)難燃性:UL94に従って試験片厚
み5mmの試料を作製して評価した。 (7)熱伝導率:直径50mmのポリエチレン製ビーカ
に、フィラー(A)を加振しながら充填した。次に樹脂
組成物を注入し、10Torrの減圧下で10分間放置
し、常圧、80℃で3時間で硬化させ、直径50mm、厚
さ10mmの円板状の試験片を作製し、熱伝導率測定器
(ダイナテック社製)で熱伝導率(cal/cm・sec
・℃)を求めた。
(6) Flame retardance: A sample having a thickness of 5 mm was prepared and evaluated according to UL94. (7) Thermal conductivity: A polyethylene beaker having a diameter of 50 mm was filled with the filler (A) while vibrating. Next, the resin composition was injected, left standing under reduced pressure of 10 Torr for 10 minutes, and cured at 80 ° C. under normal pressure for 3 hours to prepare a disc-shaped test piece with a diameter of 50 mm and a thickness of 10 mm, and conduct heat conduction. Thermal conductivity (cal / cm · sec) measured by a rate measuring instrument (Dynatech)
-° C) was calculated.

【0016】実施例1〜6 表1に示すフィラー(A)と、表2に示す配合で調製し
たウレタン樹脂組成物を用い、上記試験方法に従ってウ
レタン樹脂組成物の粘度およびその硬化物の特性を調
べ、結果を表2に示した。
Examples 1 to 6 Using the filler (A) shown in Table 1 and the urethane resin composition prepared in the formulation shown in Table 2, the viscosity of the urethane resin composition and the properties of its cured product were measured according to the above-mentioned test method. The results are shown in Table 2.

【0017】[0017]

【表1】 [Table 1]

【0018】[0018]

【表2】 表2から、実施例のいずれの場合も、モデル含浸性およ
び電気機器への含浸性に優れ、難燃性および熱伝導率に
も優れることが示される。
[Table 2] From Table 2, it is shown that in any of the examples, the model impregnation property and the electric device impregnation property are excellent, and the flame retardancy and the thermal conductivity are also excellent.

【0019】比較例1〜4 表1に示すフィラー(A)と、表2に示す配合で調整し
たウレタン樹脂組成物を用いて上記試験方法に従ってウ
レタン樹脂組成物の粘度およびその硬化物の特性を調
べ、結果を表2に示した。ウレタン樹脂組成物の粘度が
4Pa.sを超える比較例1、2では、モデル含浸性と
電気機器への含浸性に劣る。フィラー(A)を用いてい
ない比較例3では、熱伝導率に劣った。平均粒子径が3
00μm未満のフィラー(A)を用いた比較例4では、
モデル含浸性および電気機器への含浸性に劣った。
Comparative Examples 1 to 4 Using the filler (A) shown in Table 1 and the urethane resin composition prepared according to the formulation shown in Table 2, the viscosity of the urethane resin composition and the characteristics of its cured product were measured according to the above test method. The results are shown in Table 2. The viscosity of the urethane resin composition is 4 Pa.s. In Comparative Examples 1 and 2 in which s exceeds s, the model impregnating property and the impregnating property into electric equipment are poor. In Comparative Example 3 in which the filler (A) was not used, the thermal conductivity was poor. Average particle size is 3
In Comparative Example 4 using the filler (A) of less than 00 μm,
It was inferior in model impregnation and impregnation to electric equipment.

【0020】[0020]

【発明の効果】本発明の製造方法によれば、ケース内に
特定のフィラーをあらかじめ含浸させ、これに特定の樹
脂組成物を特定の条件で注入して硬化させることによ
り、従来と同様に優れた含浸性と密着性が得られるとと
もに、フィラーの含有量を増加することができるため、
硬化性、耐クラック性、難燃性および熱伝導率に優れた
電気機器を低コストで得ることができる。
According to the manufacturing method of the present invention, a case is preliminarily impregnated with a specific filler, and a specific resin composition is injected into the case under specific conditions to be cured, which is excellent as in the conventional case. Since the impregnation and adhesion can be obtained and the content of the filler can be increased,
It is possible to obtain an electric device excellent in curability, crack resistance, flame retardancy and thermal conductivity at low cost.

フロントページの続き (72)発明者 小原 光雄 茨城県日立市東町四丁目13番1号 日立化 成工業株式会社山崎工場内Front page continuation (72) Inventor Mitsuo Ohara 4-13-1, Higashimachi, Hitachi City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Yamazaki Factory

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 部品を収納したケース内に平均粒子径が
300μm以上のフィラー(A)を充填した後、液状ポ
リブタジエン系ポリオール、ヒマシ油およびヒマシ油エ
ステル交換物の一または二以上、ポリイソシアネートな
らびに平均粒子径が100μm以下のフィラー(B)を
含み、該組成物の粘度が4Pa.s以下で、その硬化物
の難燃性がUL94V−2以上(試験片厚み5mm以下)
であるウレタン樹脂組成物を、100Torr以下の真
空度で注入し、硬化させることを特徴とする電気機器の
製造方法。
1. A case containing parts is filled with a filler (A) having an average particle size of 300 μm or more, and then one or more of liquid polybutadiene-based polyol, castor oil and castor oil transesterification product, polyisocyanate and The composition contains a filler (B) having an average particle diameter of 100 μm or less, and the composition has a viscosity of 4 Pa.s. s or less, the flame retardancy of the cured product is UL94V-2 or more (test piece thickness 5 mm or less)
The method for producing an electric device, which comprises injecting the urethane resin composition which is No. 1 at a vacuum degree of 100 Torr or less and curing the same.
JP24325692A 1992-09-11 1992-09-11 Manufacturing method of electrical equipment Expired - Fee Related JP3227823B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24325692A JP3227823B2 (en) 1992-09-11 1992-09-11 Manufacturing method of electrical equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24325692A JP3227823B2 (en) 1992-09-11 1992-09-11 Manufacturing method of electrical equipment

Publications (2)

Publication Number Publication Date
JPH0691665A true JPH0691665A (en) 1994-04-05
JP3227823B2 JP3227823B2 (en) 2001-11-12

Family

ID=17101169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24325692A Expired - Fee Related JP3227823B2 (en) 1992-09-11 1992-09-11 Manufacturing method of electrical equipment

Country Status (1)

Country Link
JP (1) JP3227823B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7008046B2 (en) 1997-07-15 2006-03-07 Silverbrook Research Pty Ltd Micro-electromechanical liquid ejection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7008046B2 (en) 1997-07-15 2006-03-07 Silverbrook Research Pty Ltd Micro-electromechanical liquid ejection device

Also Published As

Publication number Publication date
JP3227823B2 (en) 2001-11-12

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