JP2019161210A - Electromagnetic wave shielding molding - Google Patents
Electromagnetic wave shielding molding Download PDFInfo
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- JP2019161210A JP2019161210A JP2018194177A JP2018194177A JP2019161210A JP 2019161210 A JP2019161210 A JP 2019161210A JP 2018194177 A JP2018194177 A JP 2018194177A JP 2018194177 A JP2018194177 A JP 2018194177A JP 2019161210 A JP2019161210 A JP 2019161210A
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- 238000000465 moulding Methods 0.000 title abstract description 10
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 15
- 239000006229 carbon black Substances 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 8
- 239000011342 resin composition Substances 0.000 claims abstract description 8
- -1 polypropylene Polymers 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 2
- 229920001890 Novodur Polymers 0.000 claims 1
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- 230000005684 electric field Effects 0.000 description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002667 nucleating agent Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920002877 acrylic styrene acrylonitrile Polymers 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- OYFUVZBROQZLCL-UHFFFAOYSA-K aluminum;4-tert-butylbenzoate;hydroxide Chemical compound [OH-].[Al+3].CC(C)(C)C1=CC=C(C([O-])=O)C=C1.CC(C)(C)C1=CC=C(C([O-])=O)C=C1 OYFUVZBROQZLCL-UHFFFAOYSA-K 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
本発明は、特定波長の電磁波に対する遮蔽性と吸収性の高い電磁波遮蔽吸収性成形体に関する。 The present invention relates to an electromagnetic wave shielding / absorbing molded article having high shielding and absorbing properties against electromagnetic waves of a specific wavelength.
車両の自動運転や衝突防止を目的とするミリ波レーダー装置が知られている。
ミリ波レーダー装置は、自動車の前方中央、両側方、後方両側方など各部に取り付けられ、電波を送受信するアンテナが組み込まれた高周波モジュール、該電波を制御する制御回路、アンテナおよび制御回路を収納するハウジング、アンテナの電波の送受信を覆うレドームを備えている（特許文献１の背景技術）。このように構成されたミリ波レーダー装置は、アンテナからミリ波を送受信して、障害物との相対距離や相対速度などを検出することができる。
アンテナは、目的とする障害物以外の路面などに反射したものも受信することがあるため、装置の検出精度が低下するおそれがある。
このような問題を解決するため、特許文献１のミリ波レーダー装置では、アンテナと制御回路との間に電波を遮蔽する遮蔽部材を設けている。
特許文献１の発明の課題を解決するものとして、繊維長３〜３０ｍｍの炭素長繊維を含む熱可塑性樹脂組成物と、それから得られる電磁波の吸収性能を有している成形体の発明が提案されている（特許文献２）。
その他、平均長さ０．５〜１５ｍｍの炭素繊維を含む熱可塑性樹脂成形品の電磁波シールド性が良いという発明が提案されている（特許文献３）。
Millimeter wave radar devices for the purpose of automatic driving of vehicles and collision prevention are known.
The millimeter-wave radar device is attached to each part such as the front center, both sides, and both sides of the rear of an automobile, and houses a high-frequency module in which an antenna that transmits and receives radio waves is incorporated, a control circuit that controls the radio waves, an antenna, and a control circuit A housing and a radome that covers transmission and reception of radio waves from the antenna are provided (background art of Patent Document 1). The millimeter wave radar device configured as described above can detect a relative distance, a relative speed, and the like with an obstacle by transmitting and receiving millimeter waves from an antenna.
Since the antenna may receive the antenna reflected on the road surface other than the target obstacle, the detection accuracy of the apparatus may be lowered.
In order to solve such a problem, the millimeter wave radar device of Patent Document 1 includes a shielding member that shields radio waves between the antenna and the control circuit.
In order to solve the problems of the invention of Patent Document 1, an invention of a thermoplastic resin composition containing carbon fiber having a fiber length of 3 to 30 mm and a molded article having an electromagnetic wave absorption performance obtained therefrom is proposed. (Patent Document 2).
In addition, an invention has been proposed in which an electromagnetic wave shielding property of a thermoplastic resin molded article containing carbon fibers having an average length of 0.5 to 15 mm is good (Patent Document 3).
本発明は、特定周波数の電磁波の遮蔽性と吸収性が優れている電磁波遮蔽吸収性成形体を提供することを課題とする。 An object of the present invention is to provide an electromagnetic wave shielding / absorbing molded article having excellent shielding properties and absorptivity of electromagnetic waves having a specific frequency.
本発明は、熱可塑性樹脂とカーボンブラックを含む熱可塑性樹脂組成物からなる電磁波遮蔽吸収性成形体であって、
前記成形体中の前記カーボンブラックの含有割合が７〜５０質量％であり、
前記電磁波遮蔽吸収性成形体が、厚みが０．０１ｍｍ〜５ｍｍで、５９GHz〜１００GHzの周波数領域のいずれかの周波数における電磁波の遮蔽効果が１０dB以上であり、前記周波数の電磁波の吸収効果が３０％以上のものである、電磁波遮蔽吸収性成形体を提供する。
本発明の電磁波遮蔽性は、電磁波の吸収性および反射性の両方を合わせた性能評価である。
The present invention is an electromagnetic wave shielding / absorbing molded article comprising a thermoplastic resin composition containing a thermoplastic resin and carbon black,
The content ratio of the carbon black in the molded body is 7 to 50% by mass,
The electromagnetic wave shielding / absorbing molded article has a thickness of 0.01 mm to 5 mm, has an electromagnetic wave shielding effect of 10 dB or more at any frequency in a frequency range of 59 GHz to 100 GHz, and has an electromagnetic wave absorbing effect of 30%. Provided is an electromagnetic wave shielding / absorbing molded article that is as described above.
The electromagnetic wave shielding property of the present invention is a performance evaluation that combines both absorption and reflection of electromagnetic waves.
本発明の電磁波遮蔽吸収性成形体は、カーボンブラックを使用することで、５９GHz〜１００GHzの周波数の電磁波に対する遮蔽性と吸収性の両方を高くすることができる。 By using carbon black, the electromagnetic wave shielding / absorbing molded article of the present invention can increase both the shielding and absorbing properties against electromagnetic waves having a frequency of 59 GHz to 100 GHz.
＜熱可塑性樹脂組成物＞
熱可塑性樹脂は、ポリプロピレン、プロピレン単位を含む共重合体およびそれらの変性物、スチレン系樹脂、ポリフェニレンスルフィド、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、ポリカーボネートから選ばれる１または２以上を使用することができる。
スチレン系樹脂は、ポリスチレン、スチレン単位を含む共重合体（ＡＳ樹脂、ＡＢＳ樹脂、ＡＳＡ樹脂、ＡＥＳ樹脂、ＭＡＳ樹脂など）を使用することができる。
<Thermoplastic resin composition>
As the thermoplastic resin, one or more selected from polypropylene, copolymers containing propylene units and modified products thereof, styrene resins, polyphenylene sulfide, polyamide, polyethylene terephthalate, polybutylene terephthalate, and polycarbonate can be used. .
As the styrene resin, polystyrene or a copolymer containing a styrene unit (AS resin, ABS resin, ASA resin, AES resin, MAS resin, or the like) can be used.
カーボンブラックはそのままでも使用することができるが、上記熱可塑性樹脂を使用したマスターバッチの形態で使用することが好ましい。
カーボンブラックは、比表面積が２０〜４００ｍ2／ｇのものが好ましい。
前記組成物（前記電磁波遮蔽吸収性成形体）中のカーボンブラックの含有割合は、７〜５０質量％であり、好ましくは７〜４０質量％であり、より好ましくは１０〜３０質量％である。
Although carbon black can be used as it is, it is preferably used in the form of a masterbatch using the above thermoplastic resin.
The carbon black preferably has a specific surface area of 20 to 400 m 2 / g.
The content ratio of carbon black in the composition (the electromagnetic wave shielding / absorbing molded article) is 7 to 50% by mass, preferably 7 to 40% by mass, and more preferably 10 to 30% by mass.
本発明で使用する熱可塑性樹脂組成物は、課題を解決できる範囲内で公知の樹脂添加剤を含有することができる。公知の樹脂添加剤としては、熱、光、紫外線などに対する安定剤、滑剤、核剤、可塑剤、公知の無機および有機充填材（但し、炭素繊維とカーボンブラックは除く）、帯電防止剤、離型剤、難燃剤、軟化剤、分散剤、酸化防止剤などを挙げることができる。
前記組成物（前記電磁波遮蔽吸収性成形体）中の上記公知の樹脂添加剤の合計含有割合は、５質量％以下が好ましく、３質量％以下がより好ましく、１質量％以下がさらに好ましい。
The thermoplastic resin composition used in the present invention can contain a known resin additive within a range that can solve the problem. Known resin additives include stabilizers against heat, light, ultraviolet rays, lubricants, nucleating agents, plasticizers, known inorganic and organic fillers (except carbon fibers and carbon black), antistatic agents, release agents. Examples include molds, flame retardants, softeners, dispersants and antioxidants.
The total content of the known resin additives in the composition (the electromagnetic wave shielding / absorbing molded article) is preferably 5% by mass or less, more preferably 3% by mass or less, and still more preferably 1% by mass or less.
＜電磁波遮蔽吸収性成形体＞
本発明の電磁波遮蔽吸収性成形体は、射出成形などの公知の樹脂成形法を適用して上記の熱可塑性樹脂組成物を成形して得られるものである。
本発明の電磁波遮蔽性成形体の大きさや形状は、下記厚みを満たす範囲内で用途に応じて適宜調整することができる。
本発明の成形体は、厚みが０．０１ｍｍ〜５ｍｍであり、好ましくは０．１〜５ｍｍより好ましくは０．２〜４ｍｍ、さらに好ましくは０．５〜４ｍｍのものである。厚みは実施例に記載の方法により測定されるものである。
本発明の電磁波遮蔽吸収性成形体は、５９GHz〜１００GHzの周波数領域のいずれかの周波数における電磁波の遮蔽性は１０dB以上、好ましくは１５dB以上、より好ましくは２０dB以上、さらに好ましくは３０dB以上にすることができる。前記電磁波の遮蔽性は、７０GHz〜１００GHzの周波数全体における遮蔽性であることが好ましい。
また本発明の電磁波遮蔽吸収性成形体は、５９GHz〜１００GHzの周波数領域のいずれかの周波数における電磁波の吸収性は３０％以上、好ましくは４０％以上、より好ましくは４０％以上、さらに好ましくは５０％以上、さらに好ましくは６０％以上にすることができる。前記電磁波の吸収性は、７０GHz〜１００GHzの周波数全体における吸収性であることが好ましい。
<Electromagnetic wave shielding / absorbing molded article>
The electromagnetic wave shielding / absorbing molded article of the present invention is obtained by molding the above thermoplastic resin composition by applying a known resin molding method such as injection molding.
The magnitude | size and shape of the electromagnetic wave shielding molded object of this invention can be suitably adjusted according to a use within the range with which the following thickness is satisfy | filled.
The molded body of the present invention has a thickness of 0.01 mm to 5 mm, preferably 0.1 to 5 mm, more preferably 0.2 to 4 mm, and still more preferably 0.5 to 4 mm. The thickness is measured by the method described in the examples.
The electromagnetic wave shielding / absorbing molded article of the present invention has an electromagnetic wave shielding property of 10 dB or more, preferably 15 dB or more, more preferably 20 dB or more, and even more preferably 30 dB or more in any frequency in the frequency range of 59 GHz to 100 GHz. Can do. The shielding property of the electromagnetic wave is preferably shielding property in the entire frequency of 70 GHz to 100 GHz.
In the electromagnetic wave shielding / absorbing molded article of the present invention, the electromagnetic wave absorbency at any frequency in the frequency range of 59 GHz to 100 GHz is 30% or more, preferably 40% or more, more preferably 40% or more, and further preferably 50. % Or more, more preferably 60% or more. The absorptivity of the electromagnetic wave is preferably absorptivity in the entire frequency of 70 GHz to 100 GHz.
（使用成分）
ＰＰ：ポリプロピレンホモポリマー，商品名「PM900A」，サンアロマー（株）製
ＣＢＭＢ１：ＣＢのマスターバッチ品，ＣＢ４０質量％含有，ＣＢの比表面積50m2／g，商品名「リオコンダクトP-1388」，東洋インキ（株）製
ＣＭＭＢ２：ＣＢのマスターバッチ品，ＣＢ８０質量％含有，ＣＢの比表面積250m2／g，商品名「ＢＫ−９５０Ｂ−８０Ｅ」，三元化成（株）製
核剤：ヒドロキシ−ジ−ｐ−ｔ−ブチル安息香酸アルミニウム，商品名「AL-PTBBA」，共同薬品（株）製
(Used ingredients)
PP: Polypropylene homopolymer, trade name “PM900A”, Sun Allomer Co., Ltd. CBMB1: CB masterbatch product, containing CB 40% by mass, CB specific surface area 50 m 2 / g, trade name “Rioconduct P-1388”, Toyo Ink Co., Ltd. CMMB2: CB master batch product, containing CB 80% by mass, CB specific surface area 250 m 2 / g, trade name “BK-950B-80E”, Sangen Kasei Co., Ltd. nucleating agent: hydroxy-di -Pt-Butyl aluminum benzoate, trade name "AL-PTBBA", manufactured by Kyodo Pharmaceutical Co., Ltd.
実施例および比較例
表１に示す各成分をドライブレンドした後、押出機（TEX30α，（株）日本製鋼所）を使用してペレット（熱可塑性樹脂組成物）を製造した。
次に得られたペレットを使用し、射出成形機（α−150iA，ファナック（株）製）により、成形温度２２０℃、金型温度５０℃で成形して本発明の平板状の電磁波遮蔽性成形体（150×150mm）を得た。
得られた電磁波遮蔽吸収性成形体を使用して、表１に示す各測定を実施した。
Examples and Comparative Examples After dry blending the components shown in Table 1, pellets (thermoplastic resin composition) were produced using an extruder (TEX30α, Nippon Steel Works, Ltd.).
Next, the obtained pellets are used and molded by an injection molding machine (α-150iA, manufactured by FANUC Co., Ltd.) at a molding temperature of 220 ° C. and a mold temperature of 50 ° C., and the flat electromagnetic shielding molding of the present invention. A body (150 x 150 mm) was obtained.
Each measurement shown in Table 1 was implemented using the obtained electromagnetic wave shielding / absorbing molded article.
（１）厚み（ｍｍ）
平板状の電磁波遮蔽吸収性成形体（150×150mm）の中心部分（対角線の交わる部分）の厚さを測定した。
(1) Thickness (mm)
The thickness of the central portion (the portion where the diagonal lines intersect) of the flat electromagnetic wave shielding / absorbing molded body (150 × 150 mm) was measured.
（２）電磁波遮蔽性と電磁波吸収性
図１に示す測定装置（ネットワークアナライザ）を使用した。
水平方向に対向させた１対のアンテナ（コルゲートホーンアンテナ）１１、１２の間に測定対象となる成形体１０（縦150ｍｍ、横150ｍｍ、表に示す厚み）を保持した。アンテナ１２と成形体１０の間隔は０ｍｍ、成形体１０とアンテナ１１との間隔は０ｍｍである。
この状態にて、下側のアンテナ１２から電磁波（６５〜１１０ＧＨｚ）を放射して、測定対象となる成形体１０を透過した電磁波を上側のアンテナ１１で受信して、下記式１、式２から電磁波遮蔽性（放射波の透過阻害性）を求め、下記式３〜６から電磁波吸収性を求めた。
電磁波遮蔽性（ｄＢ）＝２０ｌｏｇ（１／｜Ｓ21｜） （式１）
Ｓ21＝（透過電界強度）／（入射電界強度） （式２）
式１のＳ21は、透過電界強度と入射電界強度の比を表すＳパラメータ（式２）で、ネットワークアナライザ２０により測定できる。
式１では、電磁波遮蔽性（ｄＢ）を正の値で表すため、Ｓパラメータの逆数の対数をとった。図１の測定装置では、０〜約１００ｄＢの範囲が測定可能で、電磁波シールド性が測定上限を超える場合は表１において「＞１００（ｄＢ）」と表記した。
Ｓ11＝（反射電界強度）／（入射電界強度） （式３）
式３のＳ11は、反射電界強度と入射電界強度の比を表すＳパラメータで、Ｓ21と同じく、ネットワークアナライザにより測定できる。
吸収率は、電力基準として、下記式のように百分率で表記した。
透過率（％）＝Ｓ21 2×１００ （式４）
反射率（％）＝Ｓ11 2×１００ （式５）
吸収率（％）＝１００−透過率−反射率 （式６）
(2) Electromagnetic wave shielding and electromagnetic wave absorption The measuring device (network analyzer) shown in FIG. 1 was used.
Between a pair of antennas (corrugated horn antennas) 11 and 12 opposed in the horizontal direction, a molded body 10 (length 150 mm, width 150 mm, thickness shown in the table) to be measured was held. The distance between the
In this state, an electromagnetic wave (65 to 110 GHz) is radiated from the
Electromagnetic wave shielding property (dB) = 20 log (1 / | S 21 |) (Formula 1)
S 21 = (transmission electric field strength) / (incident electric field strength) (Formula 2)
S 21 in Equation 1 is an S parameter (Equation 2) that represents the ratio between the transmitted electric field strength and the incident electric field strength, and can be measured by the
In Formula 1, in order to express electromagnetic wave shielding (dB) with a positive value, the logarithm of the reciprocal of the S parameter was taken. In the measuring apparatus of FIG. 1, the range of 0 to about 100 dB can be measured, and when the electromagnetic wave shielding property exceeds the upper limit of measurement, “> 100 (dB)” is shown in Table 1.
S 11 = (reflection electric field strength) / (incident electric field strength) (Formula 3)
S 11 in Equation 3 is an S parameter that represents the ratio of the reflected electric field intensity to the incident electric field intensity, and can be measured by a network analyzer in the same manner as S 21 .
The absorption rate was expressed as a percentage as the following formula as a power standard.
Transmittance (%) = S 21 2 × 100 (Formula 4)
Reflectance (%) = S 11 2 × 100 (Formula 5)
Absorptivity (%) = 100−Transmittance−Reflectance (Formula 6)
表１の実施例と比較例の対比から明らかなとおり、カーボンブラックを所定量含有することで、７０ＧＨｚ〜１００ＧＨｚの周波数範囲における電磁波の遮蔽性と吸収性の両方が優れていた。
比較例２は、カーボンブラック量が過剰で成形することができなかった例であり、比表面積による影響は認められない。
As is clear from the comparison between the examples in Table 1 and the comparative examples, by containing a predetermined amount of carbon black, both electromagnetic wave shielding and absorptivity in the frequency range of 70 GHz to 100 GHz were excellent.
Comparative Example 2 is an example where the amount of carbon black was excessive and could not be molded, and no influence by the specific surface area was observed.
本発明の電磁波遮蔽吸収性成形体は、車両の自動運転や衝突防止を目的として車両に搭載するミリ波レーダー装置用、例えば、ミリ波レーダーの送受信アンテナ制御回路との間に電波を遮蔽する遮蔽部材（送受信アンテナ用保護部材）、ミリ波レーダー装置のハウジング、ミリ波レーダー装置の取付け用部材などのほか、車両用または車両以外の電気・電子機器のハウジングなどに使用することができる。
また本発明の電磁波遮蔽吸収性成形体は、無線ＬＡＮや広帯域無線アクセスシステム、通信衛星、簡易無線、車載レーダ、位置認識システムなどの保護部材として使用することができ、さらに具体的には、基地局アンテナ、ＲＲＨ（無線送受信装置）、ＢＢＵ（べースバンド装置）、基地向けＧａＮパワーアンプ、光トランシーバーなどの電波を遮蔽する保護部材として使用することができる。
The electromagnetic wave shielding / absorbing molded article of the present invention is for a millimeter wave radar device mounted on a vehicle for the purpose of automatic driving or collision prevention of the vehicle, for example, a shield that shields radio waves with a transmission / reception antenna control circuit of a millimeter wave radar. In addition to a member (protective member for a transmission / reception antenna), a housing of a millimeter wave radar device, a member for mounting a millimeter wave radar device, etc., it can be used for a vehicle or a housing of an electric / electronic device other than a vehicle.
Further, the electromagnetic wave shielding / absorbing molded article of the present invention can be used as a protective member for a wireless LAN, a broadband wireless access system, a communication satellite, a simple wireless, an in-vehicle radar, a position recognition system, and the like. It can be used as a protective member that shields radio waves, such as a local antenna, RRH (wireless transmitter / receiver), BBU (baseband device), GaN power amplifier for base, optical transceiver, and the like.
Claims (5)
前記成形体中の前記カーボンブラックの含有割合が７〜５０質量％であり、
前記電磁波遮蔽吸収性成形体が、厚みが０．０１ｍｍ〜５ｍｍで、５９GHz〜１００GHzの周波数領域のいずれかの周波数における電磁波の遮蔽効果が１０dB以上であり、前記周波数の電磁波の吸収効果が３０％以上のものである、電磁波遮蔽吸収性成形体。 An electromagnetic wave shielding / absorbing molded article comprising a thermoplastic resin composition containing a thermoplastic resin and carbon black,
The content ratio of the carbon black in the molded body is 7 to 50% by mass,
The electromagnetic wave shielding / absorbing molded article has a thickness of 0.01 mm to 5 mm, has an electromagnetic wave shielding effect of 10 dB or more at any frequency in a frequency range of 59 GHz to 100 GHz, and has an electromagnetic wave absorbing effect of 30%. An electromagnetic wave shielding / absorbing molded article as described above.
たは２記載の電磁波遮蔽吸収性成形体。 The electromagnetic wave shielding / absorbing molded article according to claim 1, wherein the carbon black has a specific surface area of 20 to 400 m 2 / g.
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