含氟表面活性剂与EVA协同降凝研究

以聚氧乙烯全氟烷基醇醚和马来酸酐为原料合成了一种低聚物型含氟表面活性剂,用红外光谱对产品进行了表征,并对其性能进行了评价。实验结果表明,低聚物型含氟表面活性剂与EVA具有良好的协同降凝效果。将质量分数90%二甲苯、质量分数8%EVA、质量分数2%低聚物型含氟表面活性剂组成的降凝剂以1 000 mg/kg加入中海油某管输平台原油时,其反常点明显降低,凝点由35℃降至15℃。通过偏光显微镜观察蜡晶结晶形态发现,加入上述降凝剂后,蜡晶形态由未加剂的针状、片状转变为细小而均匀的球状,蜡晶颗粒的平均直径由10~20μm变为1~5μm。

Removal of Surface Oligomers from Polyester Fiber by an Ul-trasonic / Alkali System

The removal of surface oligomers from polyester fiber was investigated by an Ultrasonic / Alkali System.Effects of concentration of alkali, temperature, time and ultrasonic frequency were discussed. It was found that Ultrasonic / Alkali System could decrease remarkably surface oligomers content of polyester fiber dyed by HIP without influencing the dyeing properties of the fiber.