Compared with polyester, the research of polypropylene started late, and the investment in manpower and capital was low. At this stage, it is still in a backward stage. Difficulties in dyeing are also being explored.
Polypropylene high-strength fiber is one of the finished products of polypropylene, and it is one of the most widely used finished products. However, because of its difficulty in dyeing, the application field of Polypropylene high-strength fiber is limited to a certain extent, especially in the apparel industry. Since this old problem cannot be resolved at present, is there an improvement? Xiao Bian to analyze for everyone:
Polypropylene does not contain chemical groups that can bind to dyes in macromolecular structures, so dyeing is difficult. The scientific name of polypropylene fiber, near the flame that is melted down, flammable, slowly burning from the fire and black smoke, the flame is yellow on the top, the lower end of the blue, emitting an oil flavor, burned after the ash is a hard round yellow-brown particles, hand crush brittle . The melt coloring method is usually adopted. The pigment preparation and the polypropylene polymer are uniformly mixed in the screw extruder, and the color fastness of the colored fiber is obtained after melt spinning.
Another method is to copolymerize or graft copolymerize with acrylic acid, acrylonitrile, vinylpyridine, etc. to introduce a polar group that can bind to the dye on the polymer macromolecule, and then dye it directly by conventional methods. In the production of polypropylene, it is often necessary to add various additives to improve the dyeing, lightfastness and flame resistance.
At present, there is still no way to cure the shortcomings of Polypropylene high-strength fiber dyeing at home and abroad, and we can only do our utmost to improve this situation. I believe with the development of technology, this problem can be overcome in the near future.
At this stage, is polypropylen
