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AssigneesNichias Corporation, Railway Technical Research Institute
InventorsNaoto Mifune, Yasutaka Nagai, Masaaki Ashizawa, Kazuo Nishimoto, Takahiro Niwa, Shuji Ito, Masanori Hansaka
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In order to provide a damping material exhibiting an excellent vibration damping property in a wide temperature range, according to the present invention, in a magnetic composite type damping material constructed by bonding an adhesive elastic sheet containing magnetic powder to a constraining plate such as a metal plate by using an adhesive, the adhesive elastic sheet is made of a composite material consisting of rubber elastomer, adhesive resin, plasticizer, magnetic powder, etc. Since not only is the damping material having a construction described above attracted by magnetic force against a vibration source, it also is provided with a superficial adhesiveness, and the excellent vibration damping property is exhibited in a wide temperature range by a synergistic effect of the magnetic force and the adhering force.
In a magnetic composite damping material made by bonding an adhesive elastic sheet to a constraining plate by using an adhesive, the improvement comprising said elastic sheet is a magnetic composite material having one side multiple pole magnetization and a pitch between S and N poles of from 1 to 20 mm, said composite material comprising 100 parts by weight of an elastomer, 30 to 90 parts by weight of an adhesive resin, 5 to 100 parts by weight of a plasticizer and 50 to 95 wt. % of magnetic powder, said wt. % of magnetic powder being based on the total weight of the sheet, the elastic modulus of said adhesive after hardening being equal to or greater than the elastic modulus of the adhesive elastic sheet.
In an adhesive elastic damping material made by bonding an adhesive elastic sheet to a constraining plate by using an adhesive, the improvement comprising said elastic sheet is a magnetic composite material having one side multiple pole magnetization and a pitch between S and N poles of from 1 to 20 mm, said composite material comprising a thermoplastic elastomer base material, an adhesive resin, a plasticizer, magnetic powder and a processing aid, said magnetic powder being present in said elastic sheet in an amount of from 50 to 95 wt. % based on the total weight of the sheet, the elastic modulus of said adhesive after hardening being equal to or greater than the elastic modulus of the adhesive elastic sheet.
Dependencies are inferred from the claim text.