JPS6347999A - Electromagnetic wave absorbing plastic compound - Google Patents
Electromagnetic wave absorbing plastic compoundInfo
- Publication number
- JPS6347999A JPS6347999A JP19315986A JP19315986A JPS6347999A JP S6347999 A JPS6347999 A JP S6347999A JP 19315986 A JP19315986 A JP 19315986A JP 19315986 A JP19315986 A JP 19315986A JP S6347999 A JPS6347999 A JP S6347999A
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic wave
- represented
- plastic
- wave absorbing
- whiskers
- 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.)
- Pending
Links
- 239000004033 plastic Substances 0.000 title claims description 25
- 229920003023 plastic Polymers 0.000 title claims description 25
- 150000001875 compounds Chemical class 0.000 title 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 16
- 229910000859 α-Fe Inorganic materials 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052596 spinel Inorganic materials 0.000 claims description 5
- 239000011029 spinel Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- -1 alkaline earth metal titanate Chemical class 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、電磁波吸収プラスチック組成物に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an electromagnetic wave absorbing plastic composition.
パーソナルコンピュータを始めとして各種ＯＡ関連機器
、あるいは、テレビジョンやラジオ、その他オーディオ
機器を含むエレクトロニクスＪＡ３ｇは、電磁波障害に
よる誤作動、又は雑音発生を防止するため、必要な回路
を極力雑音電磁波より保護する必要が存る。Electronics JA3g, including personal computers and various OA-related equipment, as well as televisions, radios, and other audio equipment, protects necessary circuits from noise electromagnetic waves as much as possible to prevent malfunctions or noise generation due to electromagnetic interference. There is a need.
かかる電磁波吸収材料として、外観性、及び火星生産性
向上の見地より、従来の金属板製シールドに代えプラス
チック製のシールドが種々提Ｚされ、実施されるに至っ
ている。As such electromagnetic wave absorbing materials, various plastic shields have been proposed and implemented in place of the conventional metal plate shields from the viewpoint of appearance and improvement of Mars productivity.
このプラス千ツク製シールドは、プラスチックスに導電
性物質を混入し、均一分散させることが−ｍ的手段とし
て採られ、例えば特公昭ａＯ−１９２４３号に見られる
ようにプラスチックスに導電性粉末を混入するものや、
特開昭５８−１７０１００号に見られるように導電性繊
維を混入するものが公知である。This shield made by Plasseng was made by mixing a conductive substance into the plastic and uniformly dispersing it. Contaminants,
As shown in Japanese Patent Application Laid-Open No. 58-170100, it is known that conductive fibers are mixed therein.
しかしながら、前者の伝導性粉末をプラスチックスに混
入するものは、粉末混入によりプラスチックスの物性が
どうしても低下し、目的のシールド効果を発揮させるに
足る伝導性粉末を混入すると、かなりプラスチックスの
強度が犠牲とされざるを得ない問題が有る他、成形時の
樹脂流動性の悪化あるいは、混練押出装置の摩耗が激し
いといった問題が有った。However, the former method of mixing conductive powder into plastics inevitably deteriorates the physical properties of the plastic, and if enough conductive powder is mixed in to achieve the desired shielding effect, the strength of the plastic increases considerably. In addition to the problems that must be sacrificed, there were also problems such as deterioration of resin fluidity during molding and severe wear of the kneading and extrusion equipment.
また、後者の金属繊維を混入するものは、混入繊維の剛
性に起因して、押出成形が非常に困叉「となり、成形性
改良を企図してプラスチックスを利用する目的そのもの
の達成が出来なくなる問題が有り、さらに押出成形が出
来ても金属繊維の配向性に起因して成形品の縦横方向の
収縮率に差が生じ、成形精度が維持出来なくなる問題が
有った。In addition, in the case of the latter, which contains metal fibers, extrusion molding becomes extremely difficult due to the rigidity of the mixed fibers, making it impossible to achieve the purpose of using plastics to improve moldability. Furthermore, even if extrusion molding was possible, there was a problem in that the shrinkage rate of the molded product in the longitudinal and lateral directions varied due to the orientation of the metal fibers, making it impossible to maintain molding accuracy.
この発明は、上記問題点に鑑み、プラスチノクスシ二導
電性を付与し、電磁遅蒔効果を付与するに当たり、プラ
スチック本来の有する特性を犠牲とすることなく充分な
電磁波吸収能を有するＴ；、磁波吸収プラスチック組成
物を提供することを目的としてなされたものである。In view of the above-mentioned problems, the present invention has been developed to provide plastic plastic with sufficient electromagnetic wave absorption ability without sacrificing the inherent properties of plastic in imparting electrical conductivity and electromagnetic retardation effect. This was made for the purpose of providing a magnetic wave absorbing plastic composition.
即ち、この出願における第１の発明は、一般弐ＫｔＯ・
ｎＴｉＯｘで示されるチタン酸カリウムウィスカーを還
元処理して得たウィスカーをプラスチック中に均一分散
して成ることを特徴とするものであり、第２の発明は、
−Ｃ弐に、Ｃ１ｎＴｉＯｘで示されるチタン酸カリウム
ウィスカーを還元処理して得たウィスカーと、一般弐Ｍ
Ｏ−Ｆｅ、Ｏ，で示されるスピンネル型構造を有するフ
ェライトとをプラスチック中に均一分散して成ることを
特徴とするものであり、さらに第３の発明は、−形式Ｋ
ｚＯ−ｎＴｉＯｘで示されるチタン酸カリウムウィスカ
ーを還元処理して得たウィスカーと、−ｉ式Ｍ ＯＦ
ｅ ｚ○、で示されるスピンネル型構造を有するフェラ
イトと、−Ｃ式ＡＯ：ＴＨＯ□で示されるアルカリ土類
金属のチタン酸塩で代表される強誘電材料とをプラスチ
ック中に均一分散して成ることを特徴とするものである
。That is, the first invention in this application is general 2KtO.
The second invention is characterized in that whiskers obtained by reducing potassium titanate whiskers represented by nTiOx are uniformly dispersed in a plastic.
-C2 contains whiskers obtained by reducing potassium titanate whiskers represented by C1nTiOx, and general 2M
A third invention is characterized in that a ferrite having a spinel type structure represented by O-Fe, O, is uniformly dispersed in a plastic.
Whiskers obtained by reducing potassium titanate whiskers represented by zO-nTiOx and -i formula M OF
It is made by uniformly dispersing in plastic a ferrite having a spinel structure represented by e z○, and a ferroelectric material represented by an alkaline earth metal titanate represented by the -C formula AO:THO□. It is characterized by this.
この発明に使用されるチタン酸カリウムウィスカーとは
、−形式に２０・ｎＴｉＯｘで表わされ、””Ｉｔ
２．４．６及び８、Ｘはｎの値により２〜１３の値をと
る繊維状物質であって、Ｋ２ＯとＴｉＱｚとを出発原料
とし、焼成法、溶融法あるいは、フラックス法等により
合成される繊維物質を言う。The potassium titanate whisker used in the present invention is represented by 20·nTiOx in the - format, and is
2.4.6, 8, and fibrous material.
このチタン酸カリウムウィスカーは、引張強度にイ２れ
る利点を有する他、第１表に示すようにカーボンブラン
ク及びフェライト粒子に較べ優れた導電性を有し、さら
に、第２表に示すようにカーボン繊維や金属繊維に比し
、繊維径（Ｄ）及び繊維長（Ｌ）が絶対的に小さいにも
かかわらずアスペクト比（Ｌ／Ｄ）が大きいといった特
性を有す第１表
フェライト粒子 １０２〜１０７〃金属繊
維 ４０〜１２０〃２〜１５〃１６〜３０従って、
プラスチックスの混練、もしくは射出成形過程において
、スクリューとシリンダー壁あるいは、ノズル、ゲート
を通過する際に受ける剪断応力によっても繊維切断が無
く、さらにチタン酸カリウムウィスカーは単結晶である
こと及び絶対的に微小な繊維であるため分散性が良く、
流動時の異方性がなく、安定した成形性と、？ａ雑な形
状物の成形においても均一な混合が可能となり、プラス
チックスの特性を阻害しない程度の少ない添加量でも均
質な電磁波吸収能を付与出来るのである。In addition to having the advantage of tensile strength, these potassium titanate whiskers have superior conductivity compared to carbon blanks and ferrite particles as shown in Table 1, and furthermore, as shown in Table 2, carbon Table 1 ferrite particles 102 to 107 which have a characteristic of having a large aspect ratio (L/D) even though the fiber diameter (D) and fiber length (L) are absolutely small compared to fibers and metal fibers. 〃Metal fiber 40~120〃2~15〃16~30 Therefore,
In the plastics kneading or injection molding process, there is no fiber breakage due to the shear stress received when passing through screws and cylinder walls, nozzles, and gates, and potassium titanate whiskers are single crystal and absolutely Because it is a fine fiber, it has good dispersibility.
No anisotropy during flow, stable formability? Uniform mixing is possible even when molding objects with rough shapes, and homogeneous electromagnetic wave absorption ability can be imparted even with a small amount added that does not impede the properties of the plastic.
従って、他の電磁波８蔽物質の添加も可能となリ、これ
らの相乗効果によって、さらに電磁波遮蔽効果を向上さ
せることが可能となる。Therefore, it is possible to add other electromagnetic wave shielding substances, and the synergistic effect of these substances makes it possible to further improve the electromagnetic wave shielding effect.
即ち、電磁波遮蔽能は、電磁波の吸収損失、反射損失及
び反復反射損失の総和によって得られ、本発明で使用す
るチタン酸カリウムウィスカーは、上記のうち、吸収損
失の向上に効果が有る。That is, the electromagnetic wave shielding ability is obtained by the sum of absorption loss, reflection loss, and repeated reflection loss of electromagnetic waves, and the potassium titanate whiskers used in the present invention are effective in improving the absorption loss among the above.
一方、反射損失の向上に適する物質としては、スピンネ
ル型フェライトが知られており、従って、これら両者を
併用すれば、さらにＴＨ，Ｋｉｔ波遮蔽効果の向上が図
られる。On the other hand, spinel ferrite is known as a material suitable for improving reflection loss, and therefore, if both are used in combination, the TH and Kit wave shielding effects can be further improved.
さらに、これら、アルカリ土類金属のチタン酸塩で代表
される強誘電性材料を併用すれば、プラスチックスの特
性を低下させることなく強いＴＬ電磁波遮蔽能発揮させ
ることが可能となるのである。Furthermore, if these ferroelectric materials typified by titanates of alkaline earth metals are used in combination, it becomes possible to exhibit strong TL electromagnetic wave shielding ability without deteriorating the properties of plastics.
次に、この発明の実施例について説明する。 Next, embodiments of the invention will be described.
Ｃ実施例１〕
ポリプロピレン樹脂７０容積％に、導電性チタン酸カリ
ウムウィスカー（大塚化学株式会社製）３０容積％を加
え、均一混合した後、常法により、厚さ２１■、縦横１
０ｃ＋ｎｘｌＱｃｍの試共板を射出成形により成形した
。C Example 1] Add 30 volume % of conductive potassium titanate whiskers (manufactured by Otsuka Chemical Co., Ltd.) to 70 volume % of polypropylene resin, mix uniformly, and then form a sheet with a thickness of 21 cm and a length and width of 1 by a conventional method.
A trial plate of 0c+nxlQcm was molded by injection molding.
〔実施例２〕
ポリプロピレン樹脂７０容積％、実施例１と同し導電性
チタン酸カリウムウィスカーを１０容積％、フェライト
粉末（日本電気環境エンジニアリング株式会社製）２０
容積％を加え均一混合した後、実施例１と同様にして試
共品を成形した。[Example 2] 70% by volume of polypropylene resin, 10% by volume of the same conductive potassium titanate whiskers as in Example 1, 20% by volume of ferrite powder (manufactured by NEC Environmental Engineering Co., Ltd.)
After adding % by volume and mixing uniformly, a trial product was molded in the same manner as in Example 1.
〔実施例３〕
実施例１のポリプロピレン樹脂に代え、ナイロン６６樹
脂を用い、実施例１と同様にして試共品を成形した。[Example 3] A trial product was molded in the same manner as in Example 1 except that nylon 66 resin was used in place of the polypropylene resin in Example 1.
〔実施例４〕
ナイロン６６樹脂７０容積％に導電性チタン酸カリウム
ウィスカーを１０容積％、炭化ケイ素粉末を２０容積％
加え、均一混合後、実施例１と同様にして試共品を得た
。[Example 4] 70% by volume of nylon 66 resin, 10% by volume of conductive potassium titanate whiskers, and 20% by volume of silicon carbide powder.
In addition, after uniform mixing, a trial product was obtained in the same manner as in Example 1.
〔比較例１〕
実施例１の導電性チタン酸カリウムウィスカーに代え同
量のフェライト粉末を用い、実施例１と同様にして試共
品を成形した。[Comparative Example 1] A trial product was molded in the same manner as in Example 1 except that the same amount of ferrite powder was used in place of the conductive potassium titanate whiskers in Example 1.
゛〔比較例２〕
実施例３の導電性チタン酸カリウムウィスカーに代え、
同量のフェライト粉末を用い、実施例１と同様の試共品
を成形した。[Comparative Example 2] In place of the conductive potassium titanate whiskers of Example 3,
A trial product similar to that in Example 1 was molded using the same amount of ferrite powder.
〔比較例３〕
実施例１の導電性チタン酸カリウムウィスカーに代え、
同量のチタン酸バリウム粉末を用い、実施例１と同様の
試共品を成形した。[Comparative Example 3] In place of the conductive potassium titanate whiskers of Example 1,
A trial product similar to that in Example 1 was molded using the same amount of barium titanate powder.
第３表
上記実施例１〜４及び比較例１〜３につき、周波数２．
４５ＧＨｚ下での電波漏洩試験、曲げ強度、及び衝撃強
度試験を行なったところ、第３表に示す結果が得られた
。Table 3 For the above Examples 1 to 4 and Comparative Examples 1 to 3, frequency 2.
When a radio wave leakage test, a bending strength test, and an impact strength test were conducted under 45 GHz, the results shown in Table 3 were obtained.
第３表より明らかなようにフェライト粉末単独での電磁
波芯Ｑ効果に較べ、本発明の場合同量添加で優れた電磁
波吸収能を有することが確認された。 また、比較例に
比し、実施例品は曲げ強度、衝撃強度でも優れることが
判明した。As is clear from Table 3, compared to the electromagnetic wave core Q effect of ferrite powder alone, it was confirmed that the present invention has excellent electromagnetic wave absorption ability when added in the same amount. It was also found that the Example products were superior in bending strength and impact strength as compared to the Comparative Examples.
次に第４表に示す配合にて、実施例１と同様に試共品を
成形し、ＫＥＣ法により、０．０５Ｍ８２〜１００１０
０Ｏの周波数域における電波吸収能をシπり定したとこ
ろ、第１図に示す結果が得られた。Next, a trial product was molded in the same manner as in Example 1 using the formulation shown in Table 4, and 0.05M82-10010 was molded using the KEC method.
When the radio wave absorption ability in the 0O frequency range was determined, the results shown in FIG. 1 were obtained.
第４表
なお、第１図において比較例１．２及び３は前述の比較
例のものを示す。Table 4 In FIG. 1, Comparative Examples 1, 2 and 3 are those of the aforementioned Comparative Examples.
この発明は、以上説明したように、開度な’Ｓ ＴＨ波
吸収能をプラスチックスの強度特性等に悪影古を与える
ことなく付与出来、また成形性も良いので、外観性の良
い電磁波シールド体を容易に大量に生産可能となるので
ある。As explained above, this invention can provide a wide range of 'S TH wave absorption ability without adversely affecting the strength characteristics of plastics, and has good moldability, so it can be used as an electromagnetic wave shield with good appearance. The body can be easily produced in large quantities.
第１図は、この発明の電磁波の速急効果を示すグラフで
ある。FIG. 1 is a graph showing the rapid effect of electromagnetic waves of the present invention.
Claims (3)
酸カリウムウィスカーを還元処理して得たウィスカーを
プラスチック中に均一分散して成ることを特徴とする電
磁波吸収プラスチック組成物。(1) An electromagnetic wave absorbing plastic composition characterized in that whiskers obtained by reducing potassium titanate whiskers represented by the general formula K_2O·nTiO_x are uniformly dispersed in a plastic.
酸カリウムウィスカーを還元処理して得たウィスカーと
、一般式ＭＯ−Ｆｅ＿２Ｏ＿３で示されるスピンネル型
構造を有するフェライトとをプラスチック中に均一分散
して成ることを特徴とする電磁波吸収プラスチック組成
物。(2) Whiskers obtained by reducing potassium titanate whiskers represented by the general formula K_2O・nTiO_x and ferrite having a spinel structure represented by the general formula MO-Fe_2O_3 are uniformly dispersed in plastic. An electromagnetic wave absorbing plastic composition characterized by:
酸カリウムウィスカーを還元処理して得たウィスカーと
、一般式ＭＯ−Ｆｅ＿２Ｏ＿３で示されるスピンネル型
構造を有するフェライトと、一般式ＡＯ：ＴｉＯ＿２で
示されるアルカリ土類金属のチタン酸塩で代表される強
誘電材料とをプラスチック中に均一分散して成ることを
特徴とする電磁波吸収プラスチック組成物。(3) Whiskers obtained by reducing potassium titanate whiskers represented by the general formula K_2O・nTiO_x, ferrite having a spinel structure represented by the general formula MO-Fe_2O_3, and alkali represented by the general formula AO:TiO_2 An electromagnetic wave absorbing plastic composition comprising a ferroelectric material represented by an earth metal titanate and uniformly dispersed in a plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19315986A JPS6347999A (en) | 1986-08-18 | 1986-08-18 | Electromagnetic wave absorbing plastic compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19315986A JPS6347999A (en) | 1986-08-18 | 1986-08-18 | Electromagnetic wave absorbing plastic compound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6347999A true JPS6347999A (en) | 1988-02-29 |
Family
ID=16303264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19315986A Pending JPS6347999A (en) | 1986-08-18 | 1986-08-18 | Electromagnetic wave absorbing plastic compound |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6347999A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0348500A (en) * | 1988-12-19 | 1991-03-01 | Matsushita Electric Ind Co Ltd | Electric wave absorbing material |
-
1986
- 1986-08-18 JP JP19315986A patent/JPS6347999A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0348500A (en) * | 1988-12-19 | 1991-03-01 | Matsushita Electric Ind Co Ltd | Electric wave absorbing material |
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