| 摘要 |
PROBLEM TO BE SOLVED: To produce a highly heat resistant halogen-free electromagnetic wave absorber generating no dioxins through incineration by dispersing powder of a soft magnetic metal into a matrix of rubber in which flame retardance is achieved as required. SOLUTION: Acryl rubber is employed as a matrix rubber. In a mode requiring flame retardance, one or two kind of aluminum hydroxide and magnesium hydroxide is added by 50-500 phr (total quantity in case of two kinds) as a flame retardant. In order to attain a higher flame retardance (V1 standard), red phosphorus is added by 1-30 phr, as an auxiliary flame retardant, in addition to aluminum hydroxide and (or) magnesium hydroxide. In order to attain a highest flame retardance (V0 standard), one or two kind of carbon powder and ethylene-vinyl acetate copolymer is added by 1-30 phr (total quantity in case of two kinds), as an auxiliary flame retardant, along with red phosphorus by 1-30 phr in addition to aluminum hydroxide and (or) magnesium hydroxide. |
