(1) dyeable polypropylene fiber
Polypropylene fiber has no affinity fuel molecules, and its molecular aggregation structure is very close. Conventional polypropylene fiber is generally difficult to dye. At present, most of the polypropylene fiber sold in the market is colored through the coloring before spinning, but the chromatography is incomplete, which can not print, and restricts the variety of fabric. Therefore, how to apply the usual dyeing technology to polypropylene fiber has become a concern. At present, a variety of dyeable polypropylene fiber technologies have been developed. These technologies can be divided into two categories: one is graft copolymerization of polymer or monomers containing Pro fuel groups onto the molecular chain of polypropylene to make it dyeable, and the two is to destroy and lower the compact aggregation structure between macromolecules of polypropylene through a blend spinning wire. The polymers containing the parent fuel group are mixed into the polypropylene fiber to make the fibers form some submicro discontinuities with high interfacial energy, so that the fuel can penetrate into the fiber and combine with the pro fuel group.
(2) industrial polypropylene filament and high strength polypropylene fiber
Industrial polypropylene filament and high strength polypropylene refer to all polypropylene filament other than garments. Its production technology and usage are obviously different from those of clothing. The industrial polypropylene filament or high strength polypropylene fiber can be obtained by controlling the spinning, stretching and heat treatment process by selecting the polymer and higher standard polypropylene raw materials and improving the extension and crystallinity of the macromolecule chain. Its linear density, modulus and strength requirements are high, and elongation at break and expansion rate are generally low.