JPH0618133B2 - Resin-bonded permanent magnet - Google Patents
Resin-bonded permanent magnetInfo
- Publication number
- JPH0618133B2 JPH0618133B2 JP58145321A JP14532183A JPH0618133B2 JP H0618133 B2 JPH0618133 B2 JP H0618133B2 JP 58145321 A JP58145321 A JP 58145321A JP 14532183 A JP14532183 A JP 14532183A JP H0618133 B2 JPH0618133 B2 JP H0618133B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- curing agent
- imidazole
- group
- magnet
- 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
- 239000003795 chemical substances by application Substances 0.000 claims description 28
- 239000003822 epoxy resin Substances 0.000 claims description 19
- 229920000647 polyepoxide Polymers 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 125000003118 aryl group Chemical group 0.000 claims description 4
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- 150000002910 rare earth metals Chemical class 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 2
- 125000005843 halogen group Chemical group 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 48
- 229920005989 resin Polymers 0.000 description 14
- 239000011347 resin Substances 0.000 description 14
- 239000000126 substance Substances 0.000 description 10
- 230000005347 demagnetization Effects 0.000 description 9
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 6
- 230000002427 irreversible effect Effects 0.000 description 5
- -1 aliphatic amines Chemical class 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- XLSZMDLNRCVEIJ-UHFFFAOYSA-N 4-methylimidazole Chemical compound CC1=CNC=N1 XLSZMDLNRCVEIJ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 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 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- UIDDPPKZYZTEGS-UHFFFAOYSA-N 3-(2-ethyl-4-methylimidazol-1-yl)propanenitrile Chemical compound CCC1=NC(C)=CN1CCC#N UIDDPPKZYZTEGS-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000010902 jet-milling Methods 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical group [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 231100001231 less toxic Toxicity 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- QOHMWDJIBGVPIF-UHFFFAOYSA-N n',n'-diethylpropane-1,3-diamine Chemical compound CCN(CC)CCCN QOHMWDJIBGVPIF-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 125000000547 substituted alkyl group Chemical group 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
- H01F1/0558—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together bonded together
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
Description
【発明の詳細な説明】 本発明は、硬化剤にイミダゾールおよびその誘導体を用
いたエポキシ樹脂と、希土類磁石粉末からなる混合物
を、磁場中でプレス成形することによって得られる樹脂
結合型永久磁石に関するものである。The present invention relates to a resin-bonded permanent magnet obtained by press molding a mixture of an epoxy resin using imidazole and its derivative as a curing agent and rare earth magnet powder in a magnetic field. Is.
樹脂結合型永久磁石は、焼結磁石にくらべて 成形品の寸法精度が良い。Compared to sintered magnets, resin-bonded permanent magnets have better dimensional accuracy in molded products.
欠け・割れの発生が少ない。 Less chipping and cracking.
複雑形状が可能 などの利点があり、現在注目されている。しかし樹脂結
合型磁石の場合、含んでいる樹脂の割合だけ焼結磁石に
比べて性能が下がり、また配向性も低下するので一般に
焼結型磁石の1/2〜1/3程度の性能しか示さない。そのた
め性能を向上させるにはできるだけ樹脂の量を少なくす
る必要がある。また樹脂の量は少なくてしかも、(1)強
い接着力を有す、(2)耐熱性が良い、(3)耐薬品性があ
る、等の条件を満たす必要が永久磁石に使用される樹脂
にはある。永久磁石に使用されている樹脂には、熱硬化
性、熱可塑性、そしてゴム系などがあるが、熱可塑性樹
脂やゴム系の場合樹脂の充填量が多くなるため大巾な性
能低下を生じ、永久磁石として価値の乏しいものになっ
てしまう。残った熱硬化性樹脂の中でも前述の条件を満
たすものは、エポキシ樹脂に限られると言える。It has the advantage of being capable of complex shapes and is currently drawing attention. However, the performance of resin-bonded magnets is lower than that of sintered magnets by the ratio of the resin contained, and the orientation is also reduced, so generally only about 1/2 to 1/3 the performance of sintered magnets is shown. Absent. Therefore, it is necessary to reduce the amount of resin as much as possible to improve the performance. In addition, the amount of resin is small, and the resin used for permanent magnets must meet the following conditions: (1) strong adhesion, (2) good heat resistance, (3) chemical resistance, etc. Is in Resins used in permanent magnets include thermosetting, thermoplastic, and rubber-based materials, but in the case of thermoplastic resins and rubber-based materials, a large amount of resin is filled, resulting in a large decrease in performance. It becomes a poor permanent magnet. It can be said that among the remaining thermosetting resins, those that satisfy the above conditions are limited to epoxy resins.
エポキシ樹脂は主に二液（主剤と硬化剤）からなり、加
熱すると硬化剤が主剤中に含まれるエポキシ基と反応を
起こし重合が行われ、その結果強固な硬化物が得られ
る。この硬化剤には色々な種類があるが、最も多く使わ
れている硬化剤は脂肪族アミン系硬化剤であり、強い接
着力および良好な機械的特性がその特徴である。このた
め従来より永久磁石に使用されてきたエポキシ樹脂の硬
化剤もこの脂肪族アミン系であった。しかし、脂肪族ア
ミン硬化エポキシ樹脂は、耐熱性に問題があり、永久磁
石に使用した時その永久磁石の限界使用温度は１００℃
にすぎなかった。また耐溶剤性にも問題があり、このた
め高い信頼性が要求される用途には樹脂結合型磁石が使
用されることはなかった。さらに脂肪族アミンは毒性が
強いため使用に際して十分な注意を必要としたり、可使
時間が短いため一度に多くの混合物を作って置くことが
出来ない等の欠点を持っている。The epoxy resin is mainly composed of two liquids (a main agent and a curing agent), and when heated, the curing agent reacts with an epoxy group contained in the main agent to cause polymerization, resulting in a strong cured product. There are various kinds of this curing agent, but the curing agent most often used is an aliphatic amine curing agent, which is characterized by strong adhesive force and good mechanical properties. For this reason, the curing agent for the epoxy resin that has been conventionally used for permanent magnets is also the aliphatic amine type. However, the aliphatic amine-cured epoxy resin has a problem in heat resistance, and when used in a permanent magnet, the limit operating temperature of the permanent magnet is 100 ° C.
It was nothing more than Further, there is also a problem with solvent resistance, and therefore, resin-bonded magnets have not been used in applications requiring high reliability. Furthermore, aliphatic amines have the drawbacks of requiring great caution when used because they are highly toxic, and that many mixtures cannot be prepared and stored at once due to their short pot life.
本発明はこの様な欠点を解消するために、エポキシ樹脂
の硬化剤にイミダゾールおよびその誘導体を使用するも
のである。The present invention uses imidazole and its derivatives as a curing agent for epoxy resins in order to eliminate such drawbacks.
本発明において使用するイミダゾールおよびその誘導体
の構造式を次に示す。The structural formulas of imidazole and its derivative used in the present invention are shown below.
（式中のＲ１、Ｒ２、Ｒ４及びＲ５は、水素原子、ハロ
ゲン原子、アルキル基、シクロアルキル基、アリール基
又は分子中の水素原子の少なくとも１つ以上がシアノ基
あるいはヒドロキシル基で置換されたアルキル基、シク
ロアルキル基若しくはアリール基のうちいずれかの基を
表わす。） イミダゾール系硬化剤によるエポキシ樹脂の硬化は低温
で反応が遅く、高温で激しく反応する。このためエポキ
シ樹脂の可使時間が長くなり、磁石粉末とエポキシ樹脂
の混練物を大量に製造・保存することが可能になる。可
使時間とは、磁石粉末と樹脂を混練した場合に、樹脂が
硬化せずに混練時の状態がそのまま保存されている時間
を言う。結合剤として用いられる樹脂は、エポキシ樹脂
等の熱硬化性樹脂であるため、硬化剤を混合すると室温
においても、硬化が促進される。一度硬化してしまうと
配向磁場を印加しても、ほとんど配向されない。 (In the formula, R 1 , R 2 , R 4 and R 5 are each a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aryl group or at least one hydrogen atom in the molecule is a cyano group or a hydroxyl group. Represents one of a substituted alkyl group, a cycloalkyl group, and an aryl group.) Curing of an epoxy resin with an imidazole-based curing agent is slow at low temperatures and violent at high temperatures. Therefore, the pot life of the epoxy resin becomes long, and it becomes possible to manufacture and store a large amount of a kneaded product of the magnet powder and the epoxy resin. The pot life is the time during which the resin is not cured when the magnet powder and the resin are kneaded and the kneaded state is preserved as it is. Since the resin used as the binder is a thermosetting resin such as an epoxy resin, the curing is promoted even at room temperature by mixing the curing agent. Once cured, it is hardly oriented even if an orientation magnetic field is applied.
また、混練後、工程の都合上長時間放置しなければなら
ない場合が生じるため、可使時間を長くする必要があ
る。またイミダゾール硬化エポキシ樹脂は一般に良好な
耐熱性および耐薬品性を有することが知られており、こ
れが樹脂結合型磁石の耐熱性および耐薬品性の向上に大
きく寄与している。イミダゾールは脂肪族アミンに比べ
て揮発性が低くまた毒性も低いため作業時の安全性は高
くなった。Further, after kneading, it may be necessary to leave it for a long time for the convenience of the process. Therefore, it is necessary to extend the pot life. Further, imidazole-cured epoxy resin is generally known to have good heat resistance and chemical resistance, and this greatly contributes to the improvement of heat resistance and chemical resistance of the resin-bonded magnet. Imidazole is less volatile and less toxic than the aliphatic amines, so the safety at work was high.
この様に硬化剤にイミダゾールを使ったエポキシ樹脂
は、樹脂結合型磁石に最も適しており、従来からの弱点
であった磁石の温度特性、信頼性を改善し、また低コス
ト化にとっても大きな役割を果している。使用する希土
類磁石粉末にはR2TM17系（ＲはＹを含むランタン系金属
元素Ｌａ，Ｃｅ，Ｐｒ，Ｎｄ，Ｐｍ，Ｓｍ，Ｅｕ，Ｇ
ｄ，Ｔｂ，Ｄｙ，Ｈｏ，Ｅｒ，Ｔｍ，Ｙｂ，Ｌｕの１種
または２種以上の組合せ、ＴＭは遷移金属を表わす。）
粉末を用いる。このR2TM17系粉末は、SmCo5磁石粉末や
アルニコ及びフェライト磁石粉末に比べて非常に高い磁
気性能を有するため、樹脂結合型磁石に使用しても高性
能を保持しうることができる。エポキシ樹脂の添加量
は、磁石粉末に対し１〜６wt％が適当であり、これより
多いと密度の低下およびプレス成形時の樹脂の浸みだし
等の問題が生じてくる。In this way, the epoxy resin using imidazole as the curing agent is most suitable for resin-bonded magnets, improving the temperature characteristics and reliability of magnets, which were weak points in the past, and also plays a major role in cost reduction. Is fulfilling. The rare earth magnet powder used is an R 2 TM 17 type (R is a lanthanum type metallic element containing Y, La, Ce, Pr, Nd, Pm, Sm, Eu, G).
One or a combination of two or more of d, Tb, Dy, Ho, Er, Tm, Yb and Lu, and TM represents a transition metal. )
Use powder. Since this R 2 TM 17- based powder has much higher magnetic performance than SmCo 5 magnet powder and Alnico and ferrite magnet powder, it can maintain high performance even when used in resin-bonded magnets. An appropriate amount of the epoxy resin added is 1 to 6 wt% with respect to the magnet powder. If the amount is greater than this, problems such as a decrease in density and resin oozing during press molding occur.
以上の通り、本発明における永久磁石およびその製造方
法は、イミダゾールを硬化剤としたエポキシ樹脂と希土
類磁石粉末からなる混合物をプレス成形して造るため、
耐熱性や耐薬品性の優れた永久磁石が安価で造れるので
ある。As described above, since the permanent magnet and the manufacturing method thereof according to the present invention are formed by press molding a mixture of an epoxy resin having an imidazole as a curing agent and a rare earth magnet powder,
Permanent magnets with excellent heat resistance and chemical resistance can be manufactured at low cost.
つぎに、実施例を用いて本発明の詳細に説明する。Next, the present invention will be described in detail using examples.
＜実施例１＞ Ｓｍ（Cobal Cu0.07Fe0.3Zr0.016）７．８の組成の合金
を高周波溶解炉で溶解しインゴットをつくる。このイン
ゴットに溶体化処理そして時効処理などの熱処理を行な
う。その後このインゴットをジェットミルで２〜８０μ
ｍ程度まで粉砕する。得られた粉末にエポキシ樹脂を混
合し、この混合物を型の中に装入して、電磁石と油圧プ
レスを用いて、印加磁場１６（ＫＧ）をかけながら、３
ton／cm2加圧し、脱磁後、型内から試料を抜き出す。こ
の磁石成型体は、その後恒温槽中で加熱硬化される。<Example 1> Sm (Cobal Cu 0.07 Fe 0.3 Zr 0.016 ) An alloy having a composition of 7.8 is melted in a high frequency melting furnace to form an ingot. This ingot is subjected to heat treatment such as solution treatment and aging treatment. After that, this ingot is jet milled at 2-80μ
Grind to about m. Epoxy resin was mixed with the obtained powder, the mixture was charged into a mold, and while applying an applied magnetic field of 16 (KG) using an electromagnet and a hydraulic press, 3
After pressurizing ton / cm 2 and demagnetizing, pull out the sample from the mold. This magnet molding is then heat-cured in a constant temperature bath.
使用されるエポキシ樹脂は、主剤に対し、硬化剤をイミ
ダゾール類の場合２〜５重量部、脂肪族アミン類の場合
１０〜２０重量部加えてよく撹拌して、均一になったら
磁石粉末に対し２重量％を添加する。The epoxy resin used is based on the main agent, and the curing agent is added in an amount of 2 to 5 parts by weight for imidazoles and 10 to 20 parts by weight for aliphatic amines. Add 2% by weight.
イミダゾール系硬化剤１−シアノエチル−２−エチル−
４−メチルイミダゾールを用いた樹脂結合型磁石（試料
−１）と、脂肪族アミン系硬化剤を使用した磁石（試料
２，３）の耐熱性と耐薬品性を比較した。第１表は耐熱
性を表わし、第２表は耐薬品を表している。Imidazole type curing agent 1-cyanoethyl-2-ethyl-
The heat resistance and chemical resistance of a resin-bonded magnet using 4-methylimidazole (Sample-1) and a magnet using an aliphatic amine-based curing agent (Samples 2 and 3) were compared. Table 1 shows the heat resistance, and Table 2 shows the chemical resistance.
磁石を着磁後加熱すると減磁が生じる。減磁の中には、
(1)可逆減磁と(2)不可逆減磁があり、樹脂結合型磁石の
不可逆減磁は焼結磁石にくらべて相当大きな値を持つ。
第１表は、硬化剤を変えた樹脂結合型磁石を着磁し、そ
の後恒温槽中に1000時間放置した時の不可逆減磁率を表
したものである。Demagnetization occurs when the magnet is heated after being magnetized. During demagnetization,
There are (1) reversible demagnetization and (2) irreversible demagnetization, and the irreversible demagnetization of the resin-bonded magnet has a considerably larger value than the sintered magnet.
Table 1 shows the irreversible demagnetization rate when a resin-bonded magnet with a different curing agent was magnetized and then left in a constant temperature bath for 1000 hours.
第１表より、脂肪族アミン系硬化剤を使用した試料２と
試料３にくらべてイミダゾールを使用した試料１は不可
逆減磁率が大幅に低下していることが判る。不可逆減磁
の原因となる樹脂の熱劣化や樹脂と磁石粉末間の接着力
の低下などがイミダゾールによって改善されたためであ
ると言える。 From Table 1, it can be seen that the irreversible demagnetization rate of Sample 1 using imidazole is significantly lower than that of Samples 2 and 3 using the aliphatic amine curing agent. It can be said that imidazole has improved the heat deterioration of the resin causing the irreversible demagnetization and the reduction of the adhesive force between the resin and the magnet powder.
第１表と同じ硬化剤を使用した試料について耐薬品性を
調べた結果を第２表に示す。Table 2 shows the results of examining the chemical resistance of the samples using the same curing agent as in Table 1.
第２表よりイミダゾール硬化エポキシ樹脂を使用した場
合、耐溶剤性が著しく改善されているのが判る。この実
施例から判るように、イミダゾールを使用すれば樹脂結
合型磁石の信頼性が大きく改善されることは確実であ
る。耐熱性の実験は次の要領で行った。つまりφ１０×
７mmの円柱形状をした、異方性方向が７mm長軸方向にあ
る試料をパルス法で着磁し、第１図に示された測定装置
中のプラスチックでできた測定台(3)にセットする。次
に(4)の円筒の先端につけられたコイル(2)を上へ引き上
げることによって得られた信号を(5)のデジタル磁束計
で読む。(1)の試料は１２０℃および１５０℃の恒温槽
中に１０００時間放置する。耐薬品性実験は次の要領で
行った。５×５×５mmの立方体の試料を作り各薬品に室
温中で１２０時間放置する。その後試料を取り出し試料
の表面を乾いたガーゼでふき、直ちにその重量を計り重
量変化率を調べる。 It can be seen from Table 2 that the solvent resistance is remarkably improved when the imidazole-cured epoxy resin is used. As can be seen from this example, it is certain that the use of imidazole will greatly improve the reliability of the resin-bonded magnet. The heat resistance experiment was conducted as follows. That is φ10 ×
A 7 mm columnar sample with anisotropy direction of 7 mm in the major axis direction is magnetized by the pulse method and set on the measuring table (3) made of plastic in the measuring device shown in FIG. . Next, the signal obtained by pulling up the coil (2) attached to the tip of the cylinder (4) is read by the digital magnetometer (5). The sample of (1) is left to stand in a constant temperature bath at 120 ° C and 150 ° C for 1000 hours. The chemical resistance test was conducted as follows. A 5 × 5 × 5 mm cubic sample is prepared and left in each chemical for 120 hours at room temperature. After that, the sample is taken out and the surface of the sample is wiped with dry gauze, and the weight is immediately measured to examine the rate of change in weight.
＜実施例２＞ イミダゾールを使用した試料と脂肪族アミンを使用した
試料について、その混練物の可使時間を調べた。実験は
各硬化剤を含んだエポキシ樹脂と磁石粉末を混練し、こ
の混練物を室温中で放置後成形し磁気性能の劣化を見
る。第２図よりイミダゾール系硬化剤（１−シアノエチ
ル−２−エチル−４−メチルイミダゾール）を使用した
場合と脂肪族炭化水素系硬化剤（ジエチルアミノプロピ
ルアミン）を使用した場合を比較するとイミダゾール系
の可使時間の長いことがはっきりと判る。可使時間が長
いと混練物を１度に大量に生産し保存することができる
ため、コストの低減化が可能となる。またイミダゾール
は輝発性が低く皮フに対する刺激毒性が低いことからも
大量に取扱うことが可能と言える。<Example 2> The pot life of the kneaded product of the sample using imidazole and the sample using aliphatic amine was examined. In the experiment, the epoxy resin containing each curing agent and the magnetic powder were kneaded, and the kneaded product was allowed to stand at room temperature and then molded to observe the deterioration of magnetic performance. From Fig. 2, comparing the case of using the imidazole type curing agent (1-cyanoethyl-2-ethyl-4-methylimidazole) and the case of using the aliphatic hydrocarbon type curing agent (diethylaminopropylamine), the imidazole type curing agent It is clear that the usage time is long. When the pot life is long, the kneaded product can be produced and stored in a large amount at one time, and the cost can be reduced. In addition, since imidazole has low stimulant properties and low irritation toxicity to skin, it can be said that it can be handled in large quantities.
以上のように本発明磁石は、従来の樹脂結合型永久磁石
にくらべて耐熱性，耐薬品性などの信頼性が格段にすぐ
れておりまた低コスト化も可能なことから今後産業用モ
ーターなどの新しい分野への応用も考えられ、本発明の
持つ工業的意義は大きいと言える。As described above, the magnet of the present invention has remarkably excellent heat resistance and chemical resistance as compared with the conventional resin-bonded permanent magnet, and it is possible to reduce the cost. It can be said that the present invention has great industrial significance because it can be applied to new fields.
第１図は本発明で用いた熱減磁試験における磁束検出装
置を示した図。 (1)……磁石 (2)……コイル (3)……測定用ケース(A) (4)……測定用ケース(B) (5)……デジタル磁束計 第２図は混練物の可使時間を表したグラフである。（−
○−）イミダゾール硬化剤使用、（…●…）脂肪族アミ
ン硬化剤使用を表わす。縦軸は残留磁束密度Ｂｒ、横軸
は混練後経過日数を表わし、０日は混練当日を示す。FIG. 1 is a diagram showing a magnetic flux detection device in a thermal demagnetization test used in the present invention. (1) …… Magnet (2) …… Coil (3) …… Measurement case (A) (4) …… Measurement case (B) (5) …… Digital magnetometer Fig. 2 shows a kneaded product It is a graph showing usage time. (-
○-) indicates the use of an imidazole curing agent and the use of (... ● ...) aliphatic amine curing agent. The vertical axis represents the residual magnetic flux density Br, the horizontal axis represents the number of days elapsed after kneading, and 0 day represents the day of kneading.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭52−120400（ＪＰ，Ａ) 特開 昭54−125497（ＪＰ，Ａ) 特開 昭58−57425（ＪＰ，Ａ) 特開 昭56−23711（ＪＰ，Ａ) 特開 昭57−24504（ＪＰ，Ａ) 特公 昭48−17880（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-52-120400 (JP, A) JP-A-54-125497 (JP, A) JP-A-58-57425 (JP, A) JP-A-56- 23711 (JP, A) JP-A-57-24504 (JP, A) JP-B-48-17880 (JP, B1)
Claims (1)
ン原子、アルキル基、シクロアルキル基、アリール基又
は分子中の水素原子の少なくとも１つ以上がシアノ基あ
るいはヒドロキシル基で置換されたアルキル基、シクロ
アルキル基若しくはアリール基のうちいずれかの基を表
わす。）で表されるイミダゾール又はその誘導体、１〜
６重量％のエポキシ樹脂及び希土類磁石粉末とからなる
混合物を加圧成形することを特徴とする樹脂結合型永久
磁石の製造方法。1. A general formula as a curing agent (In the formula, R 1 , R 2 , R 4 and R 5 are each a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aryl group or at least one hydrogen atom in the molecule is substituted with a cyano group or a hydroxyl group. Represents an alkyl group, a cycloalkyl group, or an aryl group represented by the formula (1) or a derivative thereof, 1 to
A method for producing a resin-bonded permanent magnet, which comprises press-molding a mixture of 6% by weight of an epoxy resin and a rare earth magnet powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58145321A JPH0618133B2 (en) | 1983-08-09 | 1983-08-09 | Resin-bonded permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58145321A JPH0618133B2 (en) | 1983-08-09 | 1983-08-09 | Resin-bonded permanent magnet |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5157329A Division JPH0793207B2 (en) | 1993-06-28 | 1993-06-28 | Resin-bonded permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6037106A JPS6037106A (en) | 1985-02-26 |
| JPH0618133B2 true JPH0618133B2 (en) | 1994-03-09 |
Family
ID=15382452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58145321A Expired - Lifetime JPH0618133B2 (en) | 1983-08-09 | 1983-08-09 | Resin-bonded permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0618133B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0793207B2 (en) * | 1993-06-28 | 1995-10-09 | セイコーエプソン株式会社 | Resin-bonded permanent magnet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4829400U (en) * | 1971-07-31 | 1973-04-11 | ||
| JPS5651481A (en) * | 1979-10-05 | 1981-05-09 | Sagami Chem Res Center | 6-cyano-2-oxo-3-methyl-2,3-dihydropurine |
-
1983
- 1983-08-09 JP JP58145321A patent/JPH0618133B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6037106A (en) | 1985-02-26 |
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