| 摘要 |
A sealing material is provided, which maintains excellent sealing property for a long period of time. The sealing material of the invention is characterized by being prepared by vulcanizing and foaming a mixture containing a rubber component containing a copolymer rubber of ethylene, an α-olefin having 3 or more carbon atoms, and a non-conjugated diene, a vulcanizing agent, and a blowing agent, wherein the mixture contains a thermoplastic resin having a melting point of 80° C. or less. |
| 主权项 |
1. A sealing material prepared by vulcanizing and foaming a mixture comprising ethylene-propylene-diene copolymer rubber as a rubber component, a vulcanizing agent, a blowing agent, a vulcanization promoting auxiliary, and a dehydrating agent, wherein the mixture comprises a thermoplastic resin having a melting point of 80° C. or less, stearic acid as the vulcanization promoting auxiliary, and calcium oxide as the dehydrating agent, the sealing material having a density in the range of 90 to 150 kg/m3 measured in accordance with JIS K 7222,
wherein the thermoplastic resin is an ethylene-vinyl acetate copolymer, the ethylene-vinyl acetate copolymer is contained in the range of 5 to 40 parts by weight, based on 100 parts by weight of the rubber component, the ethylene-vinyl acetate copolymer has a melt flow rate in the range of 18 to 2500 g/10 min., and the ethylene-vinyl acetate copolymer has a vinyl acetate content in the range of 25 to 35 wt %, wherein the vulcanizing agent is contained in the range of 1 to 30 parts by weight, based on 100 parts by weight of the rubber component, and wherein the sealing material has an expansion ratio in the range of 5 to 30 and a cell number in the range of 50 to 150/25 mm, and the sealing material has a closed cell structure. |
