Study on Ultra High Molecular Weight Polyethylene Fibersdyed with High Hydrophobic Dyes

In order to dyeultrahigh molecular weight polyethylene (UHMWPE) fibers, the dyeing properties of methyl yellow dye with high planarity and super hydrophobic structure on extracted UHMWPE fiber were studied. The effects of dyeing parameters such as temperature, time, dispersant concentration and pH value of the dyeing bath were evaluated through the K/S value and dyeing fastness. The cry stallinity, orientation degree and fiber strength were examined to study the hot drawing process of extracted UHMWPE fiber dyed via acheese dyeing machine. The results showed that the methyl yellow dye had better dye ability for extracted UHMWPE fiber. The optimal dyeing process was achieved at a concentration of dispersant 0.3%, 100 degrees C for 30min with pH value 7 to 8. The K/S value reached 20.3, the color fastness to rubbing and washing was above3 ratings, and reduction rate of the breaking strength of the dyed fiber was 4.34 %. After hot drawing 2.3 times by third-level drafting, the melting point and crystallinity of the dyed UHMWPE fibers after extraction were close to the finished UHMWPE fibers, and the orientation degree was higher than the finished fibers. The process of dyeing fiber after extraction and drawing the dyed fiber can avoid high strength loss caused by high temperature and the high pressure dyeing method.