JPH0573784B2 - - Google Patents
Info
- Publication number
- JPH0573784B2 JPH0573784B2 JP59029877A JP2987784A JPH0573784B2 JP H0573784 B2 JPH0573784 B2 JP H0573784B2 JP 59029877 A JP59029877 A JP 59029877A JP 2987784 A JP2987784 A JP 2987784A JP H0573784 B2 JPH0573784 B2 JP H0573784B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- ferrite
- magnetic
- present
- 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
- 229910001047 Hard ferrite Inorganic materials 0.000 claims description 12
- 229910001035 Soft ferrite Inorganic materials 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- -1 polyethylene terephthalate Polymers 0.000 claims description 9
- 239000004952 Polyamide Substances 0.000 claims description 8
- 229920002647 polyamide Polymers 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000006247 magnetic powder Substances 0.000 claims description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 6
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims 1
- 239000011342 resin composition Substances 0.000 description 9
- 238000010292 electrical insulation Methods 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000008188 pellet Substances 0.000 description 6
- 229920005992 thermoplastic resin Polymers 0.000 description 6
- 229920001707 polybutylene terephthalate Polymers 0.000 description 5
- 239000004734 Polyphenylene sulfide Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 229920002302 Nylon 6,6 Polymers 0.000 description 3
- 239000004695 Polyether sulfone Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229920006393 polyether sulfone Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920013632 Ryton Polymers 0.000 description 1
- 239000004736 Ryton® Substances 0.000 description 1
- 229920004695 VICTREX™ PEEK Polymers 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000001175 rotational moulding Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Hard Magnetic Materials (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
本発明は電気・電子機器を構成する筺体および
電気・電子部品等に使用する電気特性および耐熱
性に優れた樹脂組成物に関する。
電気・電子機器は近年、機器の小型化、軽量
化、および薄形化が進んでおり、これに伴なつて
電磁波遮蔽性、電気絶縁性、透磁性、耐熱性、成
形加工性等の諸特性を同時に満足する材料が求め
られている。
一般に樹脂に電磁波遮蔽性を付与するためには
導電性充填材を添加することが行なわれている
が、添加量が少ないと電磁波遮蔽効果が少なく、
添加量が多いと電磁波遮蔽効果は大となるが導電
性となり電気絶縁性が低下しかつ成形加工性も悪
くなつてしまう等の問題がある。このため電磁波
遮蔽性、電気絶縁性および成形加工性を同時に満
足させることは困難であつた。
本発明者等はこのため上述の諸特性を同時に満
足させる樹脂組成物につき種々検討した結果、芳
香族ポリスルホン、ポリアミド、ポリエチレンテ
レフタレート、ポリブチレンテレフタレータから
選ばれる特定の熱可塑性樹脂にハードフエライ
ト、磁性金属、ソフトフエライトよりなる特定の
混合比の磁性体粉末混合物を特定量添加すること
により、広い周波数領域で電磁波遮蔽性を有し、
かつ電気絶縁性、透磁性および成形加工性の良好
な樹脂組成物が得られることを見い出し、本発明
の完成した。
すなわち本発明はポリアミド、ポリエチレンテ
レフタレート、ポリブチレンテレフタレート、ポ
リフエニレンサルフアイドから選ばれた１種また
は２種以上の樹脂混合物100重量部に対し、ハー
ドフエライト、磁性金属およびソフトフエライト
の３種の磁性体粉末の混合物30〜300重量部から
なつており、かつ上記３種の磁性体の混合割合
が、ハードフエライト40〜60重量部、磁性金属15
〜35重量部、ソフトフエライト15〜35重量部の比
率である電磁波遮蔽性、電気絶縁性および成形加
工性の優れた電気・電子機器用熱可塑性樹脂組成
物である。
本発明で用いられる特定の熱可塑性樹脂として
は、ポリアミド、ポリエチレンテレフタレート、
ポリブチレンテレフタレートおよびポリフエニレ
ンサルフアイドがあげられ単独または２種以上を
混合しても良い。
本発明で用いられるポリアミドとしては、ポリ
ヘキサメチレンアジパミド、ポリカプロラクタム
およびポリドデカノラクタム等が挙げられる。
本発明で用いられるハードフエライトとしては
Ba系、Sr系またはSm−Co系等の希土類系等の
磁性材が用いられる。磁性金属粉末としては透磁
性の高いNiパーマロイ、Moパーマロイおよび鉄
が特に好ましい。またソフトフエライトとしては
Mn−Zn系、Mg−Zn系またはNi−Zn系等用いる
ことができる。特にハードフエライトとしては
Sr系が、ソフトフエライトとしてはMn−Zn系の
使用が好ましい。
本発明において使用されるこれら３種の磁性体
粉末の混合割合は、最終製品に要求される電磁波
遮蔽周波数領域、電気絶縁性および成形加工性を
考慮して、ハードフエライト40〜60重量部、磁性
金属15〜35重量部、ソフトフエライト15〜35重量
部の比率の範囲で選択する。ハードフエライトの
割合がこの混合比より少ない場合には電磁波遮蔽
性が十分でなくなり、逆に多すぎる場合は体積固
有抵抗が大きくなりすぎるとともに、電磁波遮蔽
性に製品ごとのバラツキを生じ好ましくない。
本発明におけるこれ等磁性体粉末混合物の添加
量は、特定の熱可塑性樹脂100重量部に対し30〜
300重量部好ましくは50〜250重量部である。この
量より少ない場合には電磁波遮蔽性が劣り、300
重量部を越えて添加した場合には、得られる樹脂
組成物の電気絶縁性の低下および成形加工性の悪
化等の問題が生じ好ましくない。
本発明の特定の熱可塑性樹脂への特定された磁
性体粉末の添加は、一般には熱可塑性樹脂と磁性
体粉末とをヘンシエルミキサー等一般の混合機で
混合したのち、一般の押出機によりペレツト化す
ることにより行なわれる。また本発明の樹脂組成
物には、安定剤、紫外線吸収剤、滑剤、着色剤を
樹脂組成物の品質を損わない範囲で混和しても良
い。
本発明の樹脂組成物は、射出成形法、押出成形
法、圧縮成形法、回転成形法等公知の成形法によ
り成形され実用に供される。
本発明の樹脂組成物を溶融成形して得られる成
形物品は優れた電磁波遮蔽性および電気絶縁性を
有しており電気・電子機器分野において広く活用
することができる。
以下に実施例により本発明を具体的に説明す
る。
実施例１〜３および比較例１〜３
ポリアミドとしてポリヘキサメチレンアジパミ
ド樹脂〔アミラン3006（商標、東レ社製）〕を、ハ
ードフエライトとしてSr系フエライトを、磁性
金属体として鉄を、ソフトフエライトとしてMn
−Zn系をそれぞれ表−１に示した量を添加し、
ヘンシエルミキサーで混合した後、単軸押出機に
よりストランド状に押し出しペレツト化した。こ
のペレツトを用い射出成形機により50mm角の箱お
よび蓋を成形した。箱の内側に磁界発生用コイル
を、外側にキヤツチコイルを設置した。磁界発生
用コイルに105Hzの電流を有し、キヤツチコイル
で発生した電流を検出することにより電磁波遮蔽
性を測定した。またこの蓋の体積固有抵抗を測定
した。結果を表−１に示した。
実施例 ４〜７
実施例２においてポリアミドに代えて各々ポリ
エーテルスルホン樹脂（PESと略す）
〔VICTREX PES 200P（商標）〕、ポリエチレン
テレフタレート樹脂（PETと略す）〔JO15（商標、
三井ペツト社製）〕、ポリブチレンテレフタレート
樹脂（PBTと略す）〔バロツクス310（商標、エン
ジニアリングプラスチツクス社製）〕、ポリフエニ
レンサルフアイド樹脂（PPSと略す）〔ライトン
（商標、フイリツプス・ペトローリアム社製）〕を
用い実施例２と同様にペレツト化し射出成形機に
より箱および蓋を成形した。
各性能測定結果および成形性を表−２に示し
た。
The present invention relates to a resin composition with excellent electrical properties and heat resistance for use in housings and electrical/electronic parts constituting electrical/electronic equipment. In recent years, electrical and electronic devices have become smaller, lighter, and thinner, and with this, various properties such as electromagnetic shielding, electrical insulation, magnetic permeability, heat resistance, and moldability have improved. There is a need for materials that satisfy both of these requirements. Generally, conductive fillers are added to resins to provide electromagnetic shielding properties, but if the amount added is small, the electromagnetic shielding effect is small;
If the amount added is large, the electromagnetic wave shielding effect will be large, but there will be problems such as conductivity resulting in lower electrical insulation and poor moldability. Therefore, it has been difficult to simultaneously satisfy electromagnetic wave shielding properties, electrical insulation properties, and moldability. For this reason, the present inventors have conducted various studies on resin compositions that simultaneously satisfy the above-mentioned properties, and have found that a specific thermoplastic resin selected from aromatic polysulfone, polyamide, polyethylene terephthalate, and polybutylene terephthalate, hard ferrite, By adding a specific amount of a magnetic powder mixture of magnetic metal and soft ferrite in a specific mixing ratio, it has electromagnetic wave shielding properties over a wide frequency range.
It was also discovered that a resin composition with good electrical insulation, magnetic permeability, and moldability could be obtained, and the present invention was completed. That is, the present invention uses three types of magnetic materials, hard ferrite, magnetic metal, and soft ferrite, for 100 parts by weight of a mixture of one or more resins selected from polyamide, polyethylene terephthalate, polybutylene terephthalate, and polyphenylene sulfide. It consists of 30 to 300 parts by weight of a mixture of body powder, and the mixing ratio of the above three types of magnetic materials is 40 to 60 parts by weight of hard ferrite, 15 parts by weight of magnetic metal.
This is a thermoplastic resin composition for electrical and electronic equipment that has excellent electromagnetic shielding properties, electrical insulation properties, and moldability, with a ratio of ~35 parts by weight and 15 to 35 parts by weight of soft ferrite. Specific thermoplastic resins used in the present invention include polyamide, polyethylene terephthalate,
Examples include polybutylene terephthalate and polyphenylene sulfide, and they may be used alone or in combination of two or more. Examples of the polyamide used in the present invention include polyhexamethylene adipamide, polycaprolactam, and polydodecanolactam. The hard ferrite used in the present invention is
A rare earth-based magnetic material such as Ba-based, Sr-based, or Sm-Co-based magnetic material is used. As the magnetic metal powder, Ni permalloy, Mo permalloy, and iron, which have high magnetic permeability, are particularly preferred. Also, as a soft ferrite
Mn-Zn system, Mg-Zn system, Ni-Zn system, etc. can be used. Especially as a hard ferrite
As the soft ferrite, it is preferable to use the Sr type, and the Mn-Zn type as the soft ferrite. The mixing ratio of these three types of magnetic powder used in the present invention is determined by considering the electromagnetic shielding frequency range, electrical insulation properties, and moldability required for the final product: 40 to 60 parts by weight of hard ferrite, 40 to 60 parts by weight of hard ferrite, The ratio is selected within the range of 15 to 35 parts by weight of metal and 15 to 35 parts by weight of soft ferrite. If the proportion of hard ferrite is less than this mixing ratio, the electromagnetic wave shielding property will not be sufficient, and if it is too large, the volume resistivity will become too large and the electromagnetic wave shielding property will vary from product to product, which is not preferable. In the present invention, the amount of the magnetic powder mixture added is 30 to 30 parts by weight per 100 parts by weight of the specific thermoplastic resin.
The amount is 300 parts by weight, preferably 50 to 250 parts by weight. If the amount is less than this, the electromagnetic wave shielding property will be poor, and 300
If it is added in an amount exceeding 1 part by weight, problems such as a decrease in electrical insulation properties and deterioration in moldability of the resulting resin composition are undesirable. In order to add the specified magnetic powder to the specific thermoplastic resin of the present invention, the thermoplastic resin and the magnetic powder are generally mixed using a general mixer such as a Henschel mixer, and then pelletized using a general extruder. This is done by making In addition, stabilizers, ultraviolet absorbers, lubricants, and colorants may be mixed into the resin composition of the present invention as long as they do not impair the quality of the resin composition. The resin composition of the present invention is molded by a known molding method such as an injection molding method, an extrusion molding method, a compression molding method, or a rotational molding method, and is put into practical use. Molded articles obtained by melt-molding the resin composition of the present invention have excellent electromagnetic wave shielding properties and electrical insulation properties, and can be widely used in the fields of electrical and electronic equipment. The present invention will be specifically explained below using Examples. Examples 1 to 3 and Comparative Examples 1 to 3 Polyhexamethylene adipamide resin [Amiran 3006 (trademark, manufactured by Toray Industries, Inc.)] was used as the polyamide, Sr-based ferrite was used as the hard ferrite, iron was used as the magnetic metal, and soft ferrite was used. as Mn
- Add Zn series in the amounts shown in Table 1,
After mixing with a Henschel mixer, the mixture was extruded into strands using a single screw extruder to form pellets. This pellet was used to mold a 50 mm square box and lid using an injection molding machine. A magnetic field generating coil was installed inside the box, and a catch coil was installed outside. A current of 10 5 Hz was applied to the magnetic field generating coil, and the electromagnetic wave shielding property was measured by detecting the current generated by the catch coil. The volume resistivity of this lid was also measured. The results are shown in Table-1. Examples 4 to 7 Polyether sulfone resin (abbreviated as PES) was used instead of polyamide in Example 2.
[VICTREX PES 200P (trademark)], polyethylene terephthalate resin (abbreviated as PET) [JO15 (trademark,
Polybutylene terephthalate resin (abbreviated as PBT) [Barox 310 (trademark, manufactured by Engineering Plastics Co., Ltd.)], Polyphenylene sulfide resin (abbreviated as PPS) [Ryton (trademark, abbreviated as Philips Petroleum Company)] The pellets were made into pellets in the same manner as in Example 2, and a box and a lid were molded using an injection molding machine. The performance measurement results and moldability are shown in Table 2.
【表】【table】
【表】【table】
【表】
比較例 ４〜５
ポリアミドとしてポリヘキサメチレンアジパミ
ド樹脂〔アミラン3006（商標、東レ社製）〕を、ハ
ードフエライトとしてSr系フエライトを、磁性
金属体として鉄を、ソフトフエライトとしてMn
−Zn系をそれぞれ表−３に示した量を添加し、
ヘンシエルミキサーで混合した後、単軸押出機に
よりストランド状に押し出しペレツト化した。こ
のペレツトを用い射出成形機により50mm角の箱お
よび蓋を成形し、以下実施例１〜３と同様の方法
で箱の電磁波遮蔽性と蓋の体積固有抵抗を測定し
た。結果を表−３に示した。
表−３に示す如く、比較例４の場合は電磁波遮
蔽性が劣り、比較例５の場合は体積固有抵抗が大
きすぎ、かつ電磁波遮蔽性の製品ごとのバラツキ
が大きくなつた。[Table] Comparative Examples 4 to 5 Polyhexamethylene adipamide resin [Amilan 3006 (trademark, manufactured by Toray Industries, Inc.)] was used as the polyamide, Sr-based ferrite was used as the hard ferrite, iron was used as the magnetic metal, and Mn was used as the soft ferrite.
- Add Zn series in the amounts shown in Table 3,
After mixing with a Henschel mixer, the mixture was extruded into strands using a single screw extruder to form pellets. Using this pellet, a 50 mm square box and lid were molded using an injection molding machine, and the electromagnetic wave shielding properties of the box and the volume resistivity of the lid were measured in the same manner as in Examples 1 to 3. The results are shown in Table-3. As shown in Table 3, in the case of Comparative Example 4, the electromagnetic wave shielding property was poor, and in the case of Comparative Example 5, the volume resistivity was too large, and the variation in electromagnetic wave shielding property from product to product was large.
Claims (1)
ポリブチレンテレフタレート、ポリフエニレンサ
ルフアイドから選ばれた１種または２種以上の樹
脂混合物100重量部に対し、ハードフエライト、
磁性金属およびソフトフエライトの３種の磁性体
粉末の混合物30〜300重量部からなつており、か
つ上記３種の磁性体の混合割合が、ハードフエラ
イト40〜60重量部、磁性金属15〜35重量部、ソフ
トフエライト15〜35重量部の比率である電気・電
子機器用樹脂組成物。1 Polyamide, polyethylene terephthalate,
Hard ferrite,
It consists of 30 to 300 parts by weight of a mixture of three types of magnetic powder, magnetic metal and soft ferrite, and the mixing ratio of the three types of magnetic substances is 40 to 60 parts by weight of hard ferrite and 15 to 35 parts by weight of magnetic metal. 15 to 35 parts by weight of soft ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2987784A JPS60173052A (en) | 1984-02-20 | 1984-02-20 | Resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2987784A JPS60173052A (en) | 1984-02-20 | 1984-02-20 | Resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60173052A JPS60173052A (en) | 1985-09-06 |
| JPH0573784B2 true JPH0573784B2 (en) | 1993-10-15 |
Family
ID=12288202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2987784A Granted JPS60173052A (en) | 1984-02-20 | 1984-02-20 | Resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60173052A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2538326B2 (en) * | 1988-11-07 | 1996-09-25 | ダイセル・ヒュルス株式会社 | Turntable for electrical and electronic equipment |
| JPH0480274A (en) * | 1990-07-23 | 1992-03-13 | Tokin Corp | Electric radiation absorber composition |
| JPH06350284A (en) * | 1993-06-10 | 1994-12-22 | Murata Mfg Co Ltd | Chip coil element |
| JPH08204380A (en) * | 1995-01-31 | 1996-08-09 | Tokin Corp | Noise suppressing method for electric apparatus and noise suppressed electronic apparatus using this method |
| JP4181174B2 (en) * | 2003-04-15 | 2008-11-12 | 横浜ゴム株式会社 | Resin composition for molding and coating and noise suppression material using the same |
| CN102634177B (en) * | 2012-05-07 | 2016-04-06 | 杭州千石科技有限公司 | A kind of composite electromagnetic shield materials for cable |
| JP6814056B2 (en) * | 2017-01-24 | 2021-01-13 | パウダーテック株式会社 | Ferrite powder and resin composition |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5347440A (en) * | 1976-10-14 | 1978-04-27 | Dowa Tetsupun Kougiyou Kk | Antistatic resin moldings |
| JPS5374559A (en) * | 1976-12-13 | 1978-07-03 | Mitsubishi Gas Chem Co Inc | Polyamide resin composition |
| JPS54146852A (en) * | 1978-05-10 | 1979-11-16 | Shin Etsu Chem Co Ltd | Polyphenylene sulfide resin composition |
| JPS55127002A (en) * | 1979-03-26 | 1980-10-01 | Kanegafuchi Chem Ind Co Ltd | Electric wave absorbing material with high heat resistance |
| JPS5613704A (en) * | 1979-07-13 | 1981-02-10 | Teijin Ltd | Ferrite-containing composite substance |
| JPS5938244A (en) * | 1982-08-28 | 1984-03-02 | Toshiba Chem Corp | Electromagnetic wave-shielding synthetic resin molding material |
| JPS5941246A (en) * | 1982-07-22 | 1984-03-07 | ダ−ト・インダストリ−ス・インコ−ポレ−テツド | Fiber reinforced composite material |
| JPH049185A (en) * | 1990-04-27 | 1992-01-13 | Brother Ind Ltd | Cloth pressing device of sewing machine |
-
1984
- 1984-02-20 JP JP2987784A patent/JPS60173052A/en active Granted
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5347440A (en) * | 1976-10-14 | 1978-04-27 | Dowa Tetsupun Kougiyou Kk | Antistatic resin moldings |
| JPS5374559A (en) * | 1976-12-13 | 1978-07-03 | Mitsubishi Gas Chem Co Inc | Polyamide resin composition |
| JPS54146852A (en) * | 1978-05-10 | 1979-11-16 | Shin Etsu Chem Co Ltd | Polyphenylene sulfide resin composition |
| JPS55127002A (en) * | 1979-03-26 | 1980-10-01 | Kanegafuchi Chem Ind Co Ltd | Electric wave absorbing material with high heat resistance |
| JPS5613704A (en) * | 1979-07-13 | 1981-02-10 | Teijin Ltd | Ferrite-containing composite substance |
| JPS5941246A (en) * | 1982-07-22 | 1984-03-07 | ダ−ト・インダストリ−ス・インコ−ポレ−テツド | Fiber reinforced composite material |
| JPS5938244A (en) * | 1982-08-28 | 1984-03-02 | Toshiba Chem Corp | Electromagnetic wave-shielding synthetic resin molding material |
| JPH049185A (en) * | 1990-04-27 | 1992-01-13 | Brother Ind Ltd | Cloth pressing device of sewing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60173052A (en) | 1985-09-06 |
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