| 摘要 |
PURPOSE:To provide a noncorrosive waterproofing mixture excellent in waterproofness, electrical insulation, low-temperature properties, etc., by mixing liquid polybutylene, atactic polypropylene and polyolefin wax together in a specified weight ratio. CONSTITUTION:A waterproofing mixture is produced by mixing 100 pts.wt. liquid polybutene with 20-60 pts.wt. atactic polypropylene and 10-100 pts.wt. polyolefin wax (e.g. polyethylene wax). It is desirable that the starting components are mixed so that the dropping point of the obtained waterproofing mixture may be 100-130 deg.C and the penetration may be 10-30. The obtained mixture is used, for example, as a fixing agent 16 for metallic wires 13 and yarns 15 in a submarine cable composed of a conductor 11, an insulator 12, shielding metallic wires 13 and polypropylene yarns 15 for forming a waterproof and noncorrosive layer. |
