Polypropylene fiber coloring process

Published on:

2018-12-11

Polypropylene fiber is one of the world's five major synthetic fibers, with the advantages of low relative density, good chemical stability, high strength, wear resistance, etc. Also, due to the abundant sources of raw materials, simple manufacturing, low prices, and therefore developed quite rapidly, in industry and daily life has been widely used. Fine denier polypropylene fiber has a unique role in water and moisture transfer, and the underwear made of it is smooth and comfortable to wear. However, since polypropylene is a saturated hydrocarbon polymer with strong hydrophobicity and a non-polar structure, there are no polar or reactive groups in its molecules that can be combined with any dye molecules. The problem of dyeing polypropylene fibers as a textile material for consumption is an urgent issue in the further development of polypropylene fibers.

Coloring of polypropylene fiber materials
Pre-spinning coloring of polypropylene fiber materials

The traditional method of fiber coloring is to dye loose fibers, yarns, fabrics and other forms with dyes, but polypropylene due to its non-polar structure, the general common dyes almost can not be dyed on it. Therefore, commercially available polypropylene fiber fabrics, in addition to the use of modified polypropylene, generally use the original liquid coloring method to produce colored polypropylene.

Polypropylene pre-spinning liquid coloring process has three. The first is the polypropylene powder and pigment additives powder mixing, extrusion granulation, and then extrusion spinning; or directly into the extruder spinning. The second is to add polypropylene particles with powdered pigments or concentrated masterbatches by extrusion granulation and then extrusion spinning. The third is the polypropylene particles and masterbatches in the spinning machine screw extruder for mixed spinning. The masterbatch method of producing colored polypropylene fibers has the advantages of good dyeing fastness and resistance to washing, low cost, and little environmental pollution, etc. It is the main method used to produce colored fibers by primary coloring, but it is suitable for mass production, and there are disadvantages such as color is not bright, trouble to change color, etc. It is difficult to adapt to the rapid change of color needs of clothing and other industries.

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