消光锦纶6熔体流变性能的研究

Study on Melt Rheological Property of Dull Polyamide 6 Chip

利用RH7双柱型毛细管流变仪研究了有光、半消光及全消光锦纶6熔体的流变性能,分析不同消光性能锦纶6熔体的拉伸流变性能,以及剪切速率、温度对表观粘度和非牛顿指数的影响。结果表明:锦纶6熔体属于拉伸变稀型,熔体的表观拉伸粘度随拉伸应力和拉伸应变速率的增加而降低;随着剪切速率的增加,熔体的表观粘度下降;锦纶6的非牛顿指数均小于1,并且随着剪切速率的增加而降低,随着温度的升高,消光锦纶6熔体的非牛顿指数增加。

The rheological property of non-dull, half-dull and full-dull polyamide 6 are studied by double capillary rheometer RHTD. The extensional rheological properties, the influences of shear rate and temperature on the apparent viscosity and Non-Newtonican indexes of different polyamide 6 melt having different dull are analyzed. The result demonstrate that rheological properties of the polyamide 6 samples appear tension-thinning behavior. With the increase of extensional stress or extension strain rate, apparent extensional viscosity is decreased. As the shear rate increases, the apparent viscosity falls; The Non-Newtonican indexes of polyamide 6 melt are less than 1, and the will minishes when the shear rate rises, The Non-Newtonican indexes of dull polyamide 6 melt increase as the temperature is enhanced.