| 摘要 |
Provided are a highly expanded EPDM heat insulator, which is superior in softness, flexibility, heat resistance, and a noise-removing efficiency, has convenient constructability, and is easy to handle, and a manufacturing method thereof. The highly expanded EPDM heat insulator is prepared by the steps of: mixing EPDM, filler, an antioxidant, a rubber process oil, a cross-linking agent, a cross-linking promoter, a blowing agent, and a blowing promoter; aging the mixed materials; extruding the aged materials; and expanding the extruded material. The expansion step includes a vulcanization step of heating the extruded material to 100-115‹C to be vulcanized, a pre-expansion step of heating the extruded material to a temperature(120-130‹C) higher than that of the vulcanization step and preliminarily expanding the extruded material, an expansion step of heating the extruded material to a temperature(140-180‹C) higher than that of the pre-expansion step and expanding the extruded material, and an expansion and aging step of heating the expanded material to a temperature(170-150‹C) lower than that of the expansion step and expanding the unexpanded portions.
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