国产Z30S聚丙烯纺制细旦丙纶复丝的研究

研究了国产Ｚ３０Ｓ聚丙烯及其改性切片的分子量（ＭＷ）和分子量分布（ＭＷＤ）以及纺丝工艺对纺制细旦丙纶复丝可纺性和卷绕丝结构性质的影响。研究表明，采用Ｚ３０Ｓ切片即使纺丝温度高达２８０℃时，卷绕丝仍是α晶型结构，若添加少量降温母粒共纺或经改性后纺丝，卷绕丝可获得准晶型或混晶型结构，有较好的可纺性和后拉伸性；纺丝工艺条件，诸如纺丝温度、冷却条件、泵供量和纺丝速度等对卷绕丝的结构和性质虽起重要的影响，但ＰＰ的ＭＷ和ＭＷＤ则起首要的影响。

STUDY ON THE SPINNING PROCESS FOR FINE-DENIER PP FILAMENT USING RESIN Z30S

The effects of the molecular weight(MW)and molecular Weight distribution(MWD)of domestic PP resinZ30S and its modified PP as well as the spinning technology on the spinnability for fine-denier PP filamentand the structure and properties of as-spun fibers are investigated.It is shown that even if the spinning tem-perature is over 280℃,the crystal structure of the as-spun fiber made from Z30S PP is still α-form. If a fewdegradation agent is added during the spinning process or the medified PP is used.the crystal structure of as-spun fibers is smectic or complex crystalline. While the spinnability and stretching performance are im-proved.The MW and MWD of PP have more important effect on the structure and properties of as-spun fiberthan any other processing factors,such as spinning temperature,cooling conditions,pump delivery and spin-ning speed.