NPE 2009  II. NPE, Mainly Injection Molding and Mold

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  • NPE 2009　II. NPE に参加して，射出成形・金型を中心に
  • 磁性粉末-ポリマー複合体のプレス成形におけるシランカップリング剤の添加効果
  • ジセイ フンマツ ポリマー フクゴウタイ ノ プレス セイケイ ニ オケル シランカップリングザイ ノ テンカ コウカ
  • Effect of Silane Coupling Agents on Compression Molding for Magnetic Filler Composites

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Abstract

Recently, high performance of noise suppression materials heve been required to suppress the electromagnetic noise generated from high frequencies of circuits and chips in electronic equipment. These are usually supplied as a sheet of filler composite consisting of magnetic powder and polymeric binder. High packing of soft magnetic powder within the sheet produces a significant suppression of electromagnetic noise. Therefore, silane was applied to magnetic powder with various kinds of silanes such as ionic, amino, methacrylic, vinyl, and epoxy silanes to increase packing of the filler within the binder. The packing was evaluated from the void calculated by specific gravity of the magnetic filler composite sheet. All silanes have lowered the void in the composite. This effect increases in the following order; epoxy, vinyl, methacrylic, amino, and ionic silanes. This means that ionic property of silane gives affinity to the binder. As a result, the magnetic permeability increases with specific gravity of the filler composite modified by the treatment with various kinds of silanes. Finally, the occurrence of the void was examined from the torque values of a twin axis mixing mill and also observed from a soft X ray image. The resulting value of the torque in the milling is not dependent on the kinds of silanes used in treating the filler. This means that the size of the void arises not from the mechanical process of milling, but mainly from the surface treatment with silane. In the observation of voids by the X-ray imaging, there are not only a lot of voids but also aggregates of the filler in a sheet of filler composites without surface treatment. Silane treatment significantly reduces voids and aggregates. In conclusion, silane treatment plays an important role on the homogeneous spread of the filler into the polymeric binder.

Journal

  • Seikei-Kakou

    Seikei-Kakou 21 (10), 622-623, 2009-09-20

    The Japan Society of Polymer Processing

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