论文部分内容阅读
高分子材料和空气复合而成的塑料发泡体,由于介电常数和介质损耗角小,所以作为发泡绝缘一直用于希望低损耗的电线电缆领域。在使用量最多的多对金属通信电缆中,用化学发泡挤出高密度聚乙烯基的发泡绝缘。另一方面,高频同轴电缆发泡绝缘的制造方式有化学发泡和物理发泡挤出两种。物理发泡挤出适用于高发泡绝缘的制造,但一直把氟碳作发泡剂使用。由于氟碳发泡剂有破坏臭氧层等的地球坏境问题,所以寻找一种替代发泡剂已成为当务之急的重要课题。最近,对发泡氟塑料树脂绝缘电线也作过开发研究。另外,在电线电缆领域中,也出现了充分运用电气绝缘性以外的漂浮性、轻重量性等机能的发泡被覆。可以设想今后充分运用塑料发泡体特点的电线电缆领域的需求必然大增,所以必须研制出适合时代要求的新材料和新工艺。
Plastic foam made of polymer material and air has been used as foaming insulation in the field of electric wire and cable with low loss because of its low dielectric constant and dielectric loss angle. Among the most used pairs of metal communication cables, high-density polyethylene foam insulation is extruded by chemical foaming. On the other hand, high-frequency coaxial cable foam insulation manufacturing methods have two kinds of chemical foam and physical foam extrusion. Physical foam extrusion is suitable for the manufacture of high foam insulation, but has been the use of fluorocarbon as a blowing agent. Since fluorocarbon foaming agents have the problem of damaging the earth’s environment such as the ozone layer, finding an alternative foaming agent has become an urgent task. Recently, the development of foamed fluoroplastic resin insulated wire has also been made. In addition, in the field of wire and cable, there have also been foam-covered coatings that make full use of functions such as buoyancy and lightweight properties other than electrical insulation. Can imagine the future full use of plastic foam characteristics of wire and cable in the area of demand will inevitably increase, it is necessary to develop a new material and new technology suited to the requirements of the times.