Polypropylene high-strength yarn is a kind of polypropylene finished product. It is a synthetic fiber with a wide range of uses. However, because polypropylene does not contain chemical groups that can bind to dyes in its macromolecular structure, it is difficult to dye.

Because of its difficulty in dyeing, the application fields of polypropylene high-strength yarns are limited to a certain extent, especially in clothing. How to solve the problem of difficult dyeing of polypropylene high-strength yarn?

The scientific name of polypropylene high-strength yarn is polypropylene fiber. It melts near the flame and is flammable. It burns slowly and emits black smoke from the fire. The upper end of the flame is yellow and the lower end is blue, emitting a smell of petroleum. The ashes after burning are hard round light yellow-brown particles. Twist and fragile.

Usually, the melt coloring method can be used to uniformly mix the pigment preparation and the polypropylene polymer in a screw extruder, and the colored fiber obtained by melt spinning has high color fastness.

Another method is to copolymerize or graft copolymerize with acrylic acid, acrylonitrile, vinyl pyridine, etc., to introduce good groups that can be combined with dyes on the polymer macromolecules, and then directly dye with conventional methods. In the production of polypropylene high-strength yarns, various additives are often added to improve dyeability, light resistance and flame resistance.