JP5879026B2 - Flame retardant noise suppression sheet - Google Patents
Flame retardant noise suppression sheet Download PDFInfo
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- JP5879026B2 JP5879026B2 JP2010166213A JP2010166213A JP5879026B2 JP 5879026 B2 JP5879026 B2 JP 5879026B2 JP 2010166213 A JP2010166213 A JP 2010166213A JP 2010166213 A JP2010166213 A JP 2010166213A JP 5879026 B2 JP5879026 B2 JP 5879026B2
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- 230000001629 suppression Effects 0.000 title claims description 51
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims description 45
- 239000003063 flame retardant Substances 0.000 title claims description 45
- 229910000000 metal hydroxide Inorganic materials 0.000 claims description 31
- 150000004692 metal hydroxides Chemical class 0.000 claims description 31
- 229910045601 alloy Inorganic materials 0.000 claims description 29
- 239000000956 alloy Substances 0.000 claims description 29
- 239000006247 magnetic powder Substances 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 25
- 239000002491 polymer binding agent Substances 0.000 claims description 24
- 229920005596 polymer binder Polymers 0.000 claims description 22
- 229920000800 acrylic rubber Polymers 0.000 claims description 21
- 229920000058 polyacrylate Polymers 0.000 claims description 21
- 239000002131 composite material Substances 0.000 claims description 19
- 239000000347 magnesium hydroxide Substances 0.000 claims description 19
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 19
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 18
- 230000005484 gravity Effects 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 229910002796 Si–Al Inorganic materials 0.000 claims description 7
- 239000000696 magnetic material Substances 0.000 claims description 7
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 6
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 6
- 125000003700 epoxy group Chemical group 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 230000000379 polymerizing effect Effects 0.000 claims description 4
- 229910017758 Cu-Si Inorganic materials 0.000 claims description 3
- 229910017931 Cu—Si Inorganic materials 0.000 claims description 3
- 229910017082 Fe-Si Inorganic materials 0.000 claims description 3
- 229910017133 Fe—Si Inorganic materials 0.000 claims description 3
- 229910008423 Si—B Inorganic materials 0.000 claims description 3
- 229910008458 Si—Cr Inorganic materials 0.000 claims description 3
- 230000009477 glass transition Effects 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 229910021364 Al-Si alloy Inorganic materials 0.000 claims 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 24
- 230000035699 permeability Effects 0.000 description 20
- 239000000463 material Substances 0.000 description 19
- 230000001976 improved effect Effects 0.000 description 15
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000005038 ethylene vinyl acetate Substances 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 5
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- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 5
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- 229920000459 Nitrile rubber Polymers 0.000 description 4
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- 229910000702 sendust Inorganic materials 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 229910052787 antimony Inorganic materials 0.000 description 3
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229910018125 Al-Si Inorganic materials 0.000 description 2
- 229910018520 Al—Si Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 2
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- 238000000465 moulding Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 2
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000007088 Archimedes method Methods 0.000 description 1
- 229910019819 Cr—Si Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- WCCJDBZJUYKDBF-UHFFFAOYSA-N copper silicon Chemical compound [Si].[Cu] WCCJDBZJUYKDBF-UHFFFAOYSA-N 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
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- 239000000806 elastomer Substances 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007706 flame test Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229960000869 magnesium oxide Drugs 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- IBIRZFNPWYRWOG-UHFFFAOYSA-N phosphane;phosphoric acid Chemical class P.OP(O)(O)=O IBIRZFNPWYRWOG-UHFFFAOYSA-N 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
本発明は、複合磁性体からなるノイズ抑制シートに関する。 The present invention relates to a noise suppression sheet made of a composite magnetic material.
近年、携帯情報端末などのデジタル電子機器をはじめ高周波を利用する電子機器類の普及が進んでいる。これらの機器は、小型化・高性能化が求められ、内部の電子部品は高密度実装がなされている。このため、電磁波を放射するＩＣなどの電磁波放射部品が組み込まれた電子機器においては、電磁波ノイズによる電磁波障害や干渉の抑制が課題となっている。 In recent years, electronic devices using high frequencies such as digital electronic devices such as portable information terminals have been spreading. These devices are required to be small and have high performance, and internal electronic components are mounted with high density. For this reason, in an electronic device in which an electromagnetic wave radiation component such as an IC that radiates an electromagnetic wave is incorporated, suppression of electromagnetic wave interference and interference due to electromagnetic noise has been a problem.
一方、電子機器は電源部や高周波で駆動する回路において、構成材料については、難燃性が要求されることが増えてきている。 On the other hand, in an electronic device, in a circuit driven by a power supply unit or a high frequency, there is an increasing demand for flame retardancy as a constituent material.
さらに環境への負荷を軽減するために、ハロゲン系の材料を使用せずに難燃性を得る方法として、たとえば、特許文献１には、アクリルゴムのマトリクス中に、軟磁性材料の粉末を分散させてなる電磁波吸収体において、難燃剤ないし難燃助剤として、メラミンおよびメラミン誘導体の一方または両方を含むハロゲン系の材料を含まない難燃性電磁波吸収体が開示されている。また、特許文献２に記載の電磁干渉抑制体では、ハロゲン系の材料を含まない材料で難燃性を得ている。 Further, as a method for obtaining flame retardancy without using a halogen-based material in order to reduce the burden on the environment, for example, Patent Document 1 discloses that a soft magnetic material powder is dispersed in an acrylic rubber matrix. In the electromagnetic wave absorber thus made, a flame retardant electromagnetic wave absorber that does not contain a halogen-based material containing one or both of melamine and a melamine derivative is disclosed as a flame retardant or a flame retardant aid. In addition, the electromagnetic interference suppressor described in Patent Document 2 obtains flame retardancy with a material that does not contain a halogen-based material.
特許文献１に記載の電磁波吸収体の実施例として開示されている電磁波吸収シートでは、難燃性についての特定がなされているのみで、ノイズ抑制効果の向上に不可欠な磁性粉末の充填率向上の検討については記載されていない。 In the electromagnetic wave absorbing sheet disclosed as an example of the electromagnetic wave absorber described in Patent Document 1, only the flame retardancy is specified, and the filling rate of the magnetic powder that is indispensable for improving the noise suppression effect is improved. There is no description about the examination.
また特許文献２に記載の電磁干渉抑制体では、人体への影響や、環境への負荷が懸念されるアンチモン系の材料を用いている。水酸化マグネシウムを使用して、難燃性を得ているものも開示されているが、水酸化マグネシウム単体では難燃性の効果が充分得られていない。 In addition, the electromagnetic interference suppressor described in Patent Document 2 uses an antimony-based material, which is concerned about the influence on the human body and the burden on the environment. Although the thing which has obtained the flame retardance using magnesium hydroxide is also disclosed, the flame retardance effect is not fully acquired with magnesium hydroxide alone.
製品として要求される難燃規格を得ている難燃性ノイズ抑制シートとは、自己消火性を具えたものであり、これらの難燃性を得るために、赤リンやリン系のリン酸エステルを併用している。一方、近年では、赤リンは高温高湿の条件下においてイオンマイグレーションによりノイズ抑制シートの絶縁性が低下する恐れがあるなどの問題で、リン系の材料を用いないことが求められている。 The flame retardant noise suppression sheet that meets the flame retardant standards required for products has self-extinguishing properties. In order to obtain these flame retardant properties, red phosphorus and phosphorus phosphate esters are used. Are used together. On the other hand, in recent years, red phosphorus is required not to use a phosphorus-based material due to a problem that the insulation property of the noise suppression sheet may be lowered due to ion migration under high temperature and high humidity conditions.
従って本発明は、ノイズ抑制効果に優れ、かつ難燃性に優れ、イオンマイグレーションへの対策を行ったノイズ抑制シートを提供することを目的とする。 Therefore, an object of this invention is to provide the noise suppression sheet | seat which was excellent in the noise suppression effect, was excellent in a flame retardance, and took the countermeasure against ion migration.
本発明者等は、上記課題を解決すべく鋭意研究した結果、扁平状軟磁性粉末、高分子バインダー、金属水酸化物を混合した複合磁性体からなるノイズ抑制シートであって、前記扁平状軟磁性粉末はニッケルを含まない鉄系合金であり、アスペクト比（平均粒径／平均厚さ）が１５以上、９０以下であり、前記高分子バインダーは熱可塑性高分子バインダーであり、４０ｍａｓｓ％以上がエチルアクリレートである単量体を重合したアクリルゴムであって、ガラス転移温度が−３０℃以上であり、前記金属水酸化物は平均粒径が０．１μｍ以上、１μｍ以下であり、水酸化マグネシウム、水酸化アルミニウムのいずれか一方を少なくとも含み、前記複合磁性体の配合比は、前記高分子バインダー１００重量部に対して、前記扁平状軟磁性粉末を４００重量部以上、前記金属水酸化物を２００重量部以上であり、前記複合磁性体をシート状に成形した前記ノイズ抑制シートの充填率（実比重／理論比重）が８０％以上、１００％以下であることを特徴とする難燃性ノイズ抑制シートである。理論比重とは、ノイズ抑制シートに空隙（ボイド、エアー）が無いとした場合の比重である。すなわち、配合する材料自体の比重を基に、配合比によって計算されたノイズ抑制シートの比重のことである。ここで、粉末の材料自体の比重は、粒子間に隙間の無いタップ密度１００％の場合の比重とする。また、前記ニッケルを含まない鉄系合金は、Ｆｅ−Ｃｒ−Ａｌ−Ｓｉ系合金、Ｆｅ−Ｓｉ−Ａｌ系合金、Ｆｅ−Ｃｕ−Ｓｉ系合金、Ｆｅ−Ｓｉ系合金、Ｆｅ−Ｓｉ−Ｂ系合金、Ｆｅ−Ｓｉ−Ｂ−Ｃｕ−Ｎｂ系合金、Ｆｅ−Ｓｉ−Ｃｒ系合金のうちの少なくとも１種である。 As a result of diligent research to solve the above problems, the present inventors have found that the present invention is a noise suppression sheet made of a composite magnetic material in which a flat soft magnetic powder, a polymer binder, and a metal hydroxide are mixed. The magnetic powder is an iron-based alloy that does not contain nickel, the aspect ratio (average particle diameter / average thickness) is 15 or more and 90 or less, the polymer binder is a thermoplastic polymer binder, and 40 mass% or more. Acrylic rubber obtained by polymerizing a monomer that is ethyl acrylate, having a glass transition temperature of −30 ° C. or higher, and the metal hydroxide has an average particle size of 0.1 μm or more and 1 μm or less. At least one of magnesium and aluminum hydroxide is included, and the compounding ratio of the composite magnetic material is such that the flat soft magnetic powder is mixed with 100 parts by weight of the polymer binder. 00 parts by weight or more, 200 parts by weight or more of the metal hydroxide, and the filling ratio (actual specific gravity / theoretical specific gravity) of the noise suppression sheet obtained by forming the composite magnetic body into a sheet shape is 80% or more and 100% or less It is a flame-retardant noise suppression sheet characterized by being. The theoretical specific gravity is the specific gravity when there is no void (void, air) in the noise suppression sheet. That is, the specific gravity of the noise suppression sheet calculated by the mixing ratio based on the specific gravity of the material itself to be mixed. Here, the specific gravity of the powder material itself is the specific gravity when the tap density is 100% with no gaps between the particles. The iron-based alloy not containing nickel is Fe-Cr-Al-Si-based alloy, Fe-Si-Al-based alloy, Fe-Cu-Si-based alloy, Fe-Si-based alloy, Fe-Si-B-based alloy. It is at least one of an alloy, an Fe—Si—B—Cu—Nb alloy, and an Fe—Si—Cr alloy.
なお、アクリルゴムには側鎖にエポキシ基を有するのがより望ましい。 Na us, the acrylic rubber has a epoxy group in the side chain is more preferable.
また、本発明によれば、前記金属水酸化物の割合は前記水酸化マグネシウムが５０％以上、１００％以下である難燃性ノイズ抑制シートである。 Further, according to the present invention, the proportion of pre-Symbol metal hydroxide is the magnesium hydroxide 50% or more, flame retardant noise suppression sheet is 100% or less.
また、本発明によれば前記複合磁性体における前記扁平状軟磁性粉末は、平均粒径が４５μｍ以上、１０５μｍ以下である難燃性ノイズ抑制シートである。 Moreover, according to this invention, the said flat soft magnetic powder in the said composite magnetic body is a flame-retardant noise suppression sheet | seat whose average particle diameter is 45 micrometers or more and 105 micrometers or less.
本発明によれば、ノイズ抑制効果に優れ、優れた自己消火性を有する難燃性ノイズ抑制シートを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the flame-retardant noise suppression sheet | seat which is excellent in the noise suppression effect and has the outstanding self-extinguishing property can be provided.
本発明のノイズ抑制シート用の複合磁性体は扁平状軟磁性粉末、高分子バインダー、金属水酸化物からなる。これらの構成物は環境負荷を考慮して、ハロゲン系の材料やアンチモン系の材料、リン系の材料を含有しない。さらにイオンマイグレーションなどの反応性を抑えるために、赤リンも含有せず構成される複合磁性体である。 The composite magnetic body for a noise suppression sheet of the present invention comprises a flat soft magnetic powder, a polymer binder, and a metal hydroxide. These components do not contain halogen-based materials, antimony-based materials, or phosphorus-based materials in consideration of environmental impact. Furthermore, in order to suppress the reactivity such as ion migration, it is a composite magnetic body that does not contain red phosphorus.
まず、本発明の構成材料について説明する。 First, the constituent materials of the present invention will be described.
本発明で用いる磁性粉末としては、特に限定されないが、軟磁性材料から構成される軟磁性粉末が好ましい。このような軟磁性材料から構成される軟磁性粉末としては、特に限定されないが、例えば、磁性ステンレス（Ｆｅ−Ｃｒ−Ａｌ−Ｓｉ系合金）、センダスト（登録商標）等のＦｅ−Ｓｉ−Ａｌ系合金、パーマロイ（Ｆｅ−Ｎｉ系合金）、ケイ素銅（Ｆｅ−Ｃｕ−Ｓｉ系合金）、Ｆｅ−Ｓｉ系合金、Ｆｅ−Ｓｉ−Ｂ（−Ｃｕ−Ｎｂ）系合金、Ｆｅ−Ｎｉ−Ｃｒ−Ｓｉ系合金、Ｆｅ−Ｓｉ−Ｃｒ系合金、Ｆｅ−Ｓｉ−Ａｌ−Ｎｉ−Ｃｒ系合金、Ｍｏ−Ｎｉ−Ｆｅやアモルファス合金等が挙げられる。このような軟磁性粉末は１種単独でも、または複数種組み合わせて用いても良い。 The magnetic powder used in the present invention is not particularly limited, but a soft magnetic powder composed of a soft magnetic material is preferable. Although it does not specifically limit as soft-magnetic powder comprised from such a soft-magnetic material, For example, Fe-Si-Al type | system | groups, such as magnetic stainless steel (Fe-Cr-Al-Si type alloy), Sendust (trademark), etc. Alloy, permalloy (Fe-Ni alloy), silicon copper (Fe-Cu-Si alloy), Fe-Si alloy, Fe-Si-B (-Cu-Nb) alloy, Fe-Ni-Cr-Si Alloy, Fe—Si—Cr alloy, Fe—Si—Al—Ni—Cr alloy, Mo—Ni—Fe, amorphous alloy, and the like. Such soft magnetic powders may be used singly or in combination.
本発明の扁平状Ｆｅ−Ｓｉ−Ａｌ合金粉末の平均粒径は４５μｍから１０５μｍである。また、Ｆｅ−Ｓｉ−Ａｌ合金粉末は粉末の表面に数ｎｍ〜数１０ｎｍ程度の酸化被膜を有している。また、平均粒径／平均厚さで表したアスペクト比が１５〜９０である。 The average particle diameter of the flat Fe—Si—Al alloy powder of the present invention is 45 μm to 105 μm. Further, the Fe—Si—Al alloy powder has an oxide film of about several nm to several tens of nm on the surface of the powder. Moreover, the aspect ratio represented by average particle diameter / average thickness is 15-90.
高分子バインダーは、ゴム、エラストマー、樹脂があるが、リサイクル性のある熱可塑性樹脂がよく、好ましくはＥＶＡ（エチレン・酢酸ビニル共重合樹脂）、ＮＢＲ（アクリロニトリルブタジエンゴム）、ニトリルゴム、エチレン−プロピレン−ジエンゴム、アクリルゴム、エチレン酢酸ビニル共重合体、シリコーンゴム、ポリウレタンがよい。特にアクリルゴムは耐熱性が良好であり、扁平状軟磁性粉末と金属水酸化物へ配合することで高い充填性が得られる。さらにガラス転移温度が−３０℃以上となる、５０ｍａｓｓ％以上がエチルアクリレートである単量体を重合したアクリルゴムの場合、より柔軟性にも優れ、成形加工性がよく、扁平状軟磁性粉末と金属水酸化物へ配合することでより高い充填性が得られる。さらに、本アクリルゴム組成物の側鎖にエポキシ基を有することで、極性を有することにより、さらに高い充填性が得られる。 Polymer binders include rubbers, elastomers, and resins, but recyclable thermoplastic resins are preferred, preferably EVA (ethylene-vinyl acetate copolymer resin), NBR (acrylonitrile butadiene rubber), nitrile rubber, ethylene-propylene. -Diene rubber, acrylic rubber, ethylene vinyl acetate copolymer, silicone rubber and polyurethane are preferred. In particular, acrylic rubber has good heat resistance, and high filling properties can be obtained by blending into flat soft magnetic powder and metal hydroxide. Further, in the case of an acrylic rubber obtained by polymerizing a monomer having a glass transition temperature of −30 ° C. or higher and 50 mass% or more of ethyl acrylate, it has superior flexibility, good moldability, and flat soft magnetic powder. Higher fillability can be obtained by blending with metal hydroxide. Furthermore, by having an epoxy group in the side chain of the acrylic rubber composition, a higher filling property can be obtained by having polarity.
金属水酸化物は水酸化マグネシウム、水酸化アルミニウムの少なくともいずれかを用いることで難燃性を付与することができる。 The metal hydroxide can impart flame retardancy by using at least one of magnesium hydroxide and aluminum hydroxide.
金属水酸化物は、水酸化マグネシウムを５０ｍａｓｓ％以上含有すれば難燃性がより向上する。さらに、金属水酸化物の粒径を０．１μｍから２μｍとすることで良好な成形性を得ることができる。 If a metal hydroxide contains magnesium hydroxide 50 mass% or more, a flame retardance will improve more. Furthermore, favorable moldability can be obtained by setting the particle size of the metal hydroxide to 0.1 μm to 2 μm.
難燃性ノイズ抑制シートを構成する複合磁性体は、高分子バインダーを１００重量部としたときに、優れたノイズ抑制効果を得るために、扁平状軟磁性粉末を４００重量部、好ましくは５００重量部を添加する必要がある。さらに、難燃性を得るためには、これらの配合に加えて、金属水酸化物を１５０重量部以上、好ましくは２００重量部以上を添加する。 The composite magnetic body constituting the flame retardant noise suppressing sheet has 400 parts by weight of flat soft magnetic powder, preferably 500 parts by weight, in order to obtain an excellent noise suppressing effect when the polymer binder is 100 parts by weight. Parts need to be added. Furthermore, in order to obtain flame retardancy, in addition to these blends, 150 parts by weight or more, preferably 200 parts by weight or more of metal hydroxide is added.
従来技術では、高い透磁率特性を得るために、高分子バインダー１００重量部に対して、扁平状軟磁性粉末を４００重量部から好ましくは５００重量部以上添加し、さらに難燃性を確保するために、金属水酸化物を１５０重量部以上、好ましくは２００重量部以上を添加するといった概念はなく、難燃性と高透磁率の両立は実現できていなかった。 In the prior art, in order to obtain high magnetic permeability characteristics, the soft soft magnetic powder is added from 400 parts by weight, preferably 500 parts by weight or more to 100 parts by weight of the polymer binder, to further ensure flame retardancy. Furthermore, there is no concept of adding 150 parts by weight or more, preferably 200 parts by weight or more of metal hydroxide, and it has not been possible to realize both flame retardancy and high magnetic permeability.
本発明の難燃性ノイズ抑制シートは、上述した本発明の難燃性ノイズ抑制シート用複合磁性体をシート状に成形してなるものである。 The flame-retardant noise suppression sheet of the present invention is formed by molding the above-described composite magnetic body for a flame-retardant noise suppression sheet of the present invention into a sheet shape.
本発明の難燃性ノイズ抑制シートの製造方法は特に限定されないが、たとえば、以下の方法により製造することができる。すなわち、まず、扁平状軟磁性粉末、高分子バインダー、金属水酸化物、さらに溶剤を配合して低粘度化されたものを、シート状に成形する。 Although the manufacturing method of the flame-retardant noise suppression sheet | seat of this invention is not specifically limited, For example, it can manufacture with the following method. That is, first, a flat soft magnetic powder, a polymer binder, a metal hydroxide, and a solvent are blended to lower the viscosity, and then formed into a sheet shape.
次いで、シート状に成形した難燃性ノイズ抑制シート用複合磁性体を加熱することで溶剤を除去し、シート形状を固定化することにより製造することができる。または、加熱することにより架橋反応を行い、架橋物として形状を固定化することにより製造することもができる。また、加熱工程は、加熱プレス成形によって行ってもよい。 Subsequently, the composite magnetic body for a flame-retardant noise suppressing sheet formed into a sheet shape can be heated to remove the solvent and fix the sheet shape. Or it can also manufacture by performing a crosslinking reaction by heating and fixing a shape as a crosslinked product. Moreover, you may perform a heating process by hot press molding.
このようにして得られる本発明のノイズ抑制シートは、透磁率が高く、優れたノイズ抑制効果を有するものである。そのため、本発明のノイズ抑制シートは、このような特性を活かし、不要輻射対策、内部干渉対策、ＲＦＩＤ通信品質改善、ＥＳＤ対策、ＳＡＲ対策などに好適に用いることができる。 The noise suppression sheet of the present invention thus obtained has a high magnetic permeability and has an excellent noise suppression effect. Therefore, the noise suppression sheet of the present invention can be suitably used for measures against unwanted radiation, measures against internal interference, RFID communication quality improvement, measures against ESD, measures against SAR, and the like, taking advantage of such characteristics.
以上述べたように、本発明によって、ハロゲン系の材料、アンチモン系の材料、赤リンおよびリン系材料を適用せず、金属水酸化物を用いて難燃性を得た難燃性ノイズ抑制シートが提供できる。 As described above, according to the present invention, a flame retardant noise suppression sheet obtained by using a metal hydroxide without applying a halogen-based material, an antimony-based material, red phosphorus, or a phosphorus-based material. Can be provided.
以下、本発明を、さらに詳細な実施例に基づき説明するが、本発明は、これら実施例に限定されない。また、試験、評価は下記による。 Hereinafter, although this invention is demonstrated based on a more detailed Example, this invention is not limited to these Examples. The test and evaluation are as follows.
透磁率は、インピーダンスマテリアルアナライザーを用いて、１ターン法で行った。 The magnetic permeability was measured by a one-turn method using an impedance material analyzer.
比重は、厚さ０．１ｍｍとした難燃性ノイズ抑制シートを用いて、アルキメデス法で測定した。充填率は、実比重／理論比重から算出した。 The specific gravity was measured by the Archimedes method using a flame retardant noise suppression sheet having a thickness of 0.1 mm. The filling rate was calculated from the actual specific gravity / theoretical specific gravity.
難燃性は、難燃規格ＵＬ９４Ｖの垂直燃焼試験によりシートの自己消火性である難燃特性を評価した。測定方法はＵＬ９４Ｖに準拠した。 The flame retardancy was evaluated by the flame retardancy standard UL94V vertical flame test, which is the flame retardancy characteristic of the sheet. The measuring method was based on UL94V.
（実施例１）
アクリルゴム（Ａ１）１００重量部を、トルエン９００重量部に溶解することで、アクリルゴムのトルエン溶液を調製した。そして、アクリルゴムのトルエン溶液１０００重量部、長径６０μｍでアスペクト比６０のＦｅ−Ｓｉ−Ａｌ系合金であるセンダスト（登録商標）磁性粉末４５４重量部と水酸化マグネシウム（平均粒径３μｍ）を１０８重量部と水酸化アルミニウム（平均粒径３μｍ）を１０８重量部を混合して、難燃性ノイズ抑制シート用複合磁性体を調製した。これらは、実施の形態のため重量部で示したが、配合量の比率とした場合は、表１に示したように、アクリルゴム（Ａ１）は１３ｍａｓｓ％、水酸化マグネシウム（平均粒径３μｍ）は、１４ｍａｓｓ％、水酸化アルミニウム（平均粒径３μｍ）は１４ｍａｓｓ％、扁平状軟磁性粉末は５９ｍａｓｓ％である。
Example 1
A toluene solution of acrylic rubber was prepared by dissolving 100 parts by weight of acrylic rubber (A1) in 900 parts by weight of toluene. Then, 1000 parts by weight of a toluene solution of acrylic rubber, 454 parts by weight of Sendust (registered trademark) magnetic powder, which is an Fe—Si—Al alloy having a major axis of 60 μm and an aspect ratio of 60, and magnesium hydroxide (average particle size of 3 μm) are 108 parts by weight. Part and aluminum hydroxide (average particle size 3 μm) 108 parts by weight were mixed to prepare a composite magnetic body for flame-retardant noise suppressing sheet. These are shown in parts by weight for the embodiment, but when the ratio of the blending amount is set, as shown in Table 1, acrylic rubber (A1) is 13 mass%, magnesium hydroxide (average particle size 3 μm) Is 14 mass%, aluminum hydroxide (average particle size 3 μm) is 14 mass%, and the flat soft magnetic powder is 59 mass%.
そして、上記にて得られた難燃性ノイズ抑制シート用複合磁性体を用いて、基材上に塗布した後に、１１０℃、１０分の条件で乾燥することによりトルエンを除去して、厚さ０．１ｍｍの難燃性ノイズ抑制シートを作製した。そして、得られたノイズ抑制シートについて、上述の方法に従い、難燃性、比重および、透磁率の評価を行った。結果を表１に示す。 And after apply | coating on a base material using the composite magnetic body for flame-retardant noise suppression sheets obtained above, toluene is removed by drying on conditions of 110 degreeC for 10 minutes, thickness A 0.1 mm flame-retardant noise suppression sheet was prepared. And about the obtained noise suppression sheet | seat, according to the above-mentioned method, flame retardance, specific gravity, and magnetic permeability were evaluated. The results are shown in Table 1.
難燃性は良好で、１試料当たりの最大燃焼時間は１３秒であった。比較例１、比較例２、比較例３も難燃性は良好であるが、難燃性ノイズ抑制シートの充填率が４０％と低く、透磁率がμ’＝３０と低くなっている。これに対して、実施例１では透磁率がμ’＝７０と高くなって改善できている。 The flame retardancy was good and the maximum burning time per sample was 13 seconds. Although Comparative Example 1, Comparative Example 2, and Comparative Example 3 also have good flame retardancy, the filling rate of the flame-retardant noise suppression sheet is as low as 40%, and the magnetic permeability is as low as μ ′ = 30. On the other hand, in Example 1, the magnetic permeability is as high as μ ′ = 70, which can be improved.
比較例１、２、３は高分子バインダー１００重量部、センダスト（登録商標）磁性粉末４５４重量部、水酸化マグネシウム５４重量部、赤リン３８重量部、窒素系難燃剤６９重量部を混合して、難燃性ノイズ抑制シート用複合磁性体を調製した結果である。実施例１と比べて充填率が低く、透磁率も低い。高分子バインダーとして比較例１ではＥＶＡ、比較例２では、ＮＢＲ、比較例３ではアクリルゴムを用い、比較例３では透磁率が改善されているが、それでも難燃性ノイズ抑制シートの充填率が５０％であり、透磁率がμ’＝３５と低い。これは、赤リンの粒径が１０μｍであることや窒素系難燃剤を均一に分散させることは困難であり、充填性が低下したためと考えられる。 Comparative Examples 1, 2, and 3 were prepared by mixing 100 parts by weight of a polymer binder, 454 parts by weight of Sendust (registered trademark) magnetic powder, 54 parts by weight of magnesium hydroxide, 38 parts by weight of red phosphorus, and 69 parts by weight of a nitrogen flame retardant. It is the result of having prepared the composite magnetic body for flame-retardant noise suppression sheets. Compared with Example 1, the filling rate is low and the magnetic permeability is also low. As Comparative Example 1, EVA is used as the polymer binder, NBR is used in Comparative Example 2, acrylic rubber is used in Comparative Example 3, and the magnetic permeability is improved in Comparative Example 3, but the filling rate of the flame-retardant noise suppression sheet is still high. The magnetic permeability is as low as μ ′ = 35. This is considered to be because the particle size of red phosphorus is 10 μm and it is difficult to uniformly disperse the nitrogen-based flame retardant, and the filling property is lowered.
これに対して、比較例４では赤リンや窒素系難燃剤を用いず、水酸化マグネシウムのみを適用した。そうすると難燃性は低下して、自己消火性は無く、厚み０．３ｍｍでの試料は燃焼した。難燃性は厚さ０．０２５ｍｍ〜０．３ｍｍ程度製品で特に求められており、厚みが厚くなると難燃規格での自己消火性を満足することが難しくなる。扁平状軟磁性粉末量は７３ｍａｓｓ％であるにもかかわらず、難燃性ノイズ抑制シートの充填率が６０％であり、透磁率は４０であった。 In contrast, in Comparative Example 4, only magnesium hydroxide was applied without using red phosphorus or a nitrogen-based flame retardant. As a result, the flame retardancy decreased, the self-extinguishing property was not present, and the sample having a thickness of 0.3 mm burned. The flame retardancy is particularly required for products having a thickness of about 0.025 mm to 0.3 mm. When the thickness is increased, it becomes difficult to satisfy the self-extinguishing properties according to the flame retardancy standard. Although the amount of the flat soft magnetic powder was 73 mass%, the filling rate of the flame-retardant noise suppressing sheet was 60%, and the magnetic permeability was 40.
一方、本発明では、高分子バインダー１００重量部に対して、金属水酸化物を２００重量部以上も添加することで、難燃性と高透磁率の両立を実現することができている。このように金属水酸化物を過剰に添加すると、軟磁性粉末を高い充填率で添加することができる。従来技術からは難燃性ノイズ抑制シートに金属水酸化物を過剰に添加すると、高分子バインダーの配合比が低下し成形できない配合と予想されるが、本発明によれば、その予想に反した結果が得られている。 On the other hand, in the present invention, it is possible to realize both flame retardancy and high magnetic permeability by adding at least 200 parts by weight of metal hydroxide to 100 parts by weight of the polymer binder. When the metal hydroxide is added excessively as described above, the soft magnetic powder can be added at a high filling rate. From the prior art, it is expected that when the metal hydroxide is excessively added to the flame retardant noise suppression sheet, the blending ratio of the polymer binder is lowered and cannot be molded. The result is obtained.
（実施例２）
高分子バインダーの構成として、実施例１よりも多い７０ｍａｓｓ％がエチルアクリレートである単量体を重合したアクリルゴム（Ａ２）を用いた。
(Example 2)
As a constitution of the polymer binder, acrylic rubber (A2) obtained by polymerizing a monomer having 70 mass% ethyl acrylate more than that in Example 1 was used.
実施例１と同様にアクリルゴム（Ａ２）１００重量部を、トルエン９００重量部に溶解することで、アクリルゴムのトルエン溶液を調製した。そして、アクリルゴムのトルエン溶液１０００重量部、長径６０μｍでアスペクト比６０のＦｅ−Ｓｉ−Ａｌ系合金であるセンダスト（登録商標）磁性粉末４５４重量部と水酸化マグネシウム（平均粒径３μｍ）を１０８重量部と水酸化アルミニウム（平均粒径３μｍ）を１０８重量部を混合して、難燃性ノイズ抑制シート用複合磁性体を調製した。 In the same manner as in Example 1, 100 parts by weight of acrylic rubber (A2) was dissolved in 900 parts by weight of toluene to prepare a toluene solution of acrylic rubber. Then, 1000 parts by weight of a toluene solution of acrylic rubber, 454 parts by weight of Sendust (registered trademark) magnetic powder, which is an Fe—Si—Al alloy having a major axis of 60 μm and an aspect ratio of 60, and magnesium hydroxide (average particle size of 3 μm) are 108 parts by weight. Part and aluminum hydroxide (average particle size 3 μm) 108 parts by weight were mixed to prepare a composite magnetic body for flame-retardant noise suppressing sheet.
そして、上記にて得られた難燃性ノイズ抑制シート用複合磁性体を用いて、実施例１と同様に基材上に塗布した後に、１１０℃、１０分の条件で乾燥することによりトルエンを除去して、厚さ０．１ｍｍの難燃性ノイズ抑制シートを作製した。そして、得られた難燃性ノイズ抑制シートについて、上述の方法に従い、難燃性、比重および、透磁率の評価を行った。結果を表１に示した。 And after apply | coating on a base material similarly to Example 1 using the composite magnetic body for flame-retardant noise suppression sheets obtained by the above, toluene is dried by 110 degreeC and the conditions for 10 minutes. After removing, a flame-retardant noise suppression sheet having a thickness of 0.1 mm was produced. And about the obtained flame-retardant noise suppression sheet | seat, according to the above-mentioned method, flame retardance, specific gravity, and magnetic permeability were evaluated. The results are shown in Table 1.
難燃性は実施例１と同等であるが、さらに充填率が４％向上し、透磁率μ’＝７５と向上した。 Although the flame retardancy was the same as in Example 1, the filling rate was further improved by 4% and the magnetic permeability μ ′ = 75.
（実施例３）
高分子バインダーの構成として、エチルアクリレートを７０ｍａｓｓ％で共重合したアクリルゴムに対して、側鎖にエポキシ基を導入したアクリルゴム（Ａ３）を用いた。
(Example 3)
As a constitution of the polymer binder, an acrylic rubber (A3) in which an epoxy group is introduced into a side chain is used with respect to an acrylic rubber copolymerized with ethyl acrylate at 70 mass%.
実施例１と同様に難燃性ノイズ抑制シートを作製した。結果を表１に示した。難燃性は１２秒であり、充填率が８５％に向上し、透磁率μ’＝７８と実施例２よりも向上した。 A flame-retardant noise suppression sheet was prepared in the same manner as in Example 1. The results are shown in Table 1. The flame retardancy was 12 seconds, the filling rate was improved to 85%, and the permeability μ ′ = 78, which was higher than that of Example 2.
（実施例４）
表１に示した配合で、実施例１と同様に難燃性ノイズ抑制シートを作製した。結果は、難燃性が９秒と実施例３よりも改善した。これは使用した金属水酸化物の全量に対して、水酸化マグネシウムを６７％用いたことによると考えられる。
Example 4
With the formulation shown in Table 1, a flame-retardant noise suppression sheet was prepared in the same manner as in Example 1. As a result, the flame retardancy was 9 seconds, which was improved from that of Example 3. This is considered to be due to the use of 67% magnesium hydroxide with respect to the total amount of metal hydroxide used.
（実施例５）
表１に示した配合で、実施例１と同様に難燃性ノイズ抑制シートを作製した。結果は、難燃性が８秒と実施例４よりも改善した。これは使用した金属水酸化物の全量に対して、水酸化マグネシウムを１００％用いたことによると考えられる。さらに改善できた効果として、充填率が９０％となり、透磁率μ’が８２に改善した。
(Example 5)
With the formulation shown in Table 1, a flame-retardant noise suppression sheet was prepared in the same manner as in Example 1. As a result, the flame retardancy was 8 seconds, which was improved from that of Example 4. This is considered to be due to the use of 100% magnesium hydroxide with respect to the total amount of metal hydroxide used. As further improved effects, the filling rate was 90% and the magnetic permeability μ ′ was improved to 82.
（実施例６）
表１に示した配合で、実施例１と同様に難燃性ノイズ抑制シートを作製した。結果は、難燃性が７秒と改善した。これは金属水酸化物の水酸化マグネシウムの平均粒径を１μｍのものを使用したことによると考えられる。さらに改善できた効果として、充填率が９３％となり、透磁率μ’が８６に改善した。
(Example 6)
With the formulation shown in Table 1, a flame-retardant noise suppression sheet was prepared in the same manner as in Example 1. As a result, the flame retardancy improved to 7 seconds. This is presumably because the metal hydroxide magnesium hydroxide having an average particle diameter of 1 μm was used. As effects that could be further improved, the filling rate was 93%, and the magnetic permeability μ ′ was improved to 86.
金属水酸化物の平均粒径を０．１μｍから７μｍとした場合の実施例６Ａ、６Ｂ、６Ｃ、６Ｄ、６Ｅ、６Ｆ、６Ｇを表２に示す。いずれも結果は良好である。とりわけ実施例６、実施例６Ｄ、実施例６Ｅ、実施例６Ｆの結果が良好であることがわかる。このことは、金属水酸化物の平均粒径の好ましい範囲が、０．１μｍから２μｍであることを示している。 Table 2 shows Examples 6A, 6B, 6C, 6D, 6E, 6F, and 6G when the average particle size of the metal hydroxide is 0.1 μm to 7 μm. Both results are good. In particular, it can be seen that the results of Example 6, Example 6D, Example 6E, and Example 6F are good. This indicates that the preferable range of the average particle diameter of the metal hydroxide is 0.1 μm to 2 μm.
一方で、同じように金属水酸化物の平均粒径を０．１μｍから７μｍとして、高分子バインダーをＥＶＡに変更した場合の実施例６’、６Ａ’、６Ｂ’、６Ｃ’、６Ｄ’、６Ｅ’、６Ｆ’を表３に示す。表３の結果から、高分子バインダーとしてエチルアクリレートを７０ｍａｓｓ％で共重合したアクリルゴムを用いることが本発明においては優れていることを再確認できるが、同時に金属水酸化物の平均粒径が、特に０．１μｍから２μｍの範囲で優れた特性を示す傾向は高分子バインダーが異なる場合も同様である。 On the other hand, Examples 6 ′, 6A ′, 6B ′, 6C ′, 6D ′, and 6E when the average particle diameter of the metal hydroxide was changed from 0.1 μm to 7 μm and the polymer binder was changed to EVA in the same manner. “3F” is shown in Table 3. From the results of Table 3, it can be reconfirmed that it is excellent in the present invention to use acrylic rubber copolymerized with ethyl acrylate at 70 mass% as the polymer binder, but at the same time, the average particle size of the metal hydroxide is In particular, the tendency to show excellent characteristics in the range of 0.1 μm to 2 μm is the same when the polymer binder is different.
（実施例７）
表１に示した配合で、実施例１と同様に難燃性ノイズ抑制シートを作製した。結果は、難燃性が３秒と大幅に改善した。これは金属水酸化物の水酸化マグネシウムを用い、平均粒径が１μｍの水酸化マグネシウムを不飽和脂肪酸で表面を処理して使用したことによると考えられる。さらに改善できた効果として、充填率が９５％となり、透磁率μ’が９０に改善した。
(Example 7)
With the formulation shown in Table 1, a flame-retardant noise suppression sheet was prepared in the same manner as in Example 1. As a result, flame retardancy was significantly improved to 3 seconds. This is considered to be due to the use of magnesium hydroxide, which is a metal hydroxide, and magnesium hydroxide having an average particle diameter of 1 μm, which has been treated with an unsaturated fatty acid. As further improved effects, the filling rate was 95% and the magnetic permeability μ ′ was improved to 90.
一方で、金属水酸化物の平均粒径を０．１μｍから７μｍとした場合の実施例７Ａ、７Ｂ、７Ｃ、７Ｄ、７Ｅ、７Ｆを表４に示す。表４の結果から、金属水酸化物の平均粒径が、特に０．１μｍから２μｍの範囲で優れた特性を示す傾向が水酸化マグネシウムを不飽和脂肪酸で表面を処理して使用した場合も同様である。 On the other hand, Table 7 shows Examples 7A, 7B, 7C, 7D, 7E, and 7F when the average particle size of the metal hydroxide is 0.1 μm to 7 μm. From the results in Table 4, the tendency that the average particle diameter of the metal hydroxide is excellent particularly in the range of 0.1 μm to 2 μm is the same when magnesium hydroxide is used after treating the surface with an unsaturated fatty acid. It is.
以上に示したように、本発明により高分子バインダー１００重量部に対して、扁平状軟磁性粉末を４００重量部、好ましくは５００重量部以上添加した上に、金属水酸化物を２００重量部以上添加して、ノイズ抑制シートを作製することができる。 As described above, according to the present invention, 400 parts by weight of flat soft magnetic powder, preferably 500 parts by weight or more, and 200 parts by weight or more of metal hydroxide are added to 100 parts by weight of the polymer binder. By adding, a noise suppression sheet can be produced.
本発明によって、環境への負荷の少ない難燃剤のみを用い、イオンマイグレーションへの対策を強化した、難燃性と優れたノイズ抑制効果を実現することができる、周波数３ＭＨｚで透磁率６０以上となる高透磁率かつ難燃性のノイズ抑制シートの提供が可能となる。 According to the present invention, only a flame retardant having a low environmental load is used, and the countermeasures against ion migration can be enhanced to realize flame retardancy and an excellent noise suppression effect. The magnetic permeability is 60 or more at a frequency of 3 MHz. It is possible to provide a high magnetic permeability and flame-retardant noise suppression sheet.
Claims (5)
前記扁平状軟磁性粉末はニッケルを含まない鉄系合金であり、アスペクト比（平均粒径／平均厚さ）が１５以上、９０以下であり、
前記高分子バインダーは熱可塑性高分子バインダーであり、４０ｍａｓｓ％以上がエチルアクリレートである単量体を重合したアクリルゴムであって、ガラス転移温度が−３０℃以上であり、
前記金属水酸化物は平均粒径が０．１μｍ以上、１μｍ以下であり、水酸化マグネシウム、水酸化アルミニウムのいずれか一方を少なくとも含み、
前記複合磁性体の配合比は、前記高分子バインダー１００重量部に対して、前記扁平状軟磁性粉末を４００重量部以上、前記金属水酸化物を２００重量部以上であり、
前記複合磁性体をシート状に成形した前記ノイズ抑制シートの充填率（実比重／理論比重）が８０％以上、１００％以下であることを特徴とする難燃性ノイズ抑制シート。 A noise suppression sheet made of a composite magnetic material in which a flat soft magnetic powder, a polymer binder, and a metal hydroxide are mixed,
The flat soft magnetic powder is an iron-based alloy containing no nickel, and the aspect ratio (average particle size / average thickness) is 15 or more and 90 or less,
The polymer binder is a thermoplastic polymer binder, an acrylic rubber obtained by polymerizing a monomer having 40 mass% or more of ethyl acrylate, and has a glass transition temperature of −30 ° C. or more.
The metal hydroxide has an average particle size of 0.1 μm or more and 1 μm or less, and includes at least one of magnesium hydroxide and aluminum hydroxide,
The compounding ratio of the composite magnetic body is 400 parts by weight or more of the flat soft magnetic powder and 200 parts by weight or more of the metal hydroxide with respect to 100 parts by weight of the polymer binder.
A flame-retardant noise suppression sheet, wherein a filling rate (actual specific gravity / theoretical specific gravity) of the noise suppression sheet obtained by forming the composite magnetic body into a sheet is 80% or more and 100% or less.
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