线缆聚合物熔体强度及其对挤塑的影响  

Melt Strength of Cable Compounds and Its Effects on Extrusion Process

作　　者：代康 

机构地区：[1]成都普天电缆股份有限公司,成都610042

出　　处：《光纤与电缆及其应用技术》2007年第1期1-8,16,共9页Optical Fiber & Electric Cable and Their Applications

摘　　要：阐述了聚合物熔体强度对线缆挤塑的影响,指出影响聚合物熔体强度的主要因素,比较了支化型低密度聚乙烯和线型高密度聚乙烯熔体强度的特性。采用熔体张力流动法测试了物理发泡绝缘射频(RF)同轴电缆聚乙烯绝缘料的熔体强度,详细分析了如何利用聚合物熔体强度来提高发泡质量,其中包括对绝缘料、挤塑设备和工艺参数的选择。最后指出较低的熔体强度将导致阻燃聚烯烃、尼龙和高密度聚乙烯等线缆聚合物挤塑产品的缺陷,并提出了工艺改进的建议。Effects of melt strength of cable compounds on the extrusion process are addressed. The main factors, which can affect melt strength, are discussed. The melt strength properties of branched low-density polyethylene （LDPE） and linear high-density polyethylene （HDPE） are compared. The melt strength of the insulationcompound used in physically foamed RF coaxial cables is measured using the melt tension flow method. And how to improve foaming quality through utilizing the melt strength property of the insulation compound is analyzed in detail, of which the choice of insulation compounds, extrusion equipments, and process parameters is included. Finally it is pointed out that lower melt strength will lead to extrusion defects for such cable compounds as flame-retardant polyolefin, polyamide, and HDPE, and the improvement measures for the extrusion process are proposed.

关 键 词：熔体强度 聚乙烯共混物 线缆 挤塑 物理发泡 阻燃聚烯烃 齿轮泵 

分 类 号：TM246[一般工业技术—材料科学与工程]