Fiber Modification In Spinning Stage

One polymer Molecular structure hydrophilic method. This method may lead to changes in the structure of the fibers. The copolymerization strength weakens the crystallization ability of polypropylene, and has adverse effects on the physical and mechanical properties of the fibers. Therefore, the addition of hydrophilic monomers should be appropriate. This method is very limited in improving the moisture absorption of fibers.

2. and Hydrophilicity Monomer graft copolymerization. Selecting hydrophilic monomer or polymer as a straight chain and grafting on fibrous macromolecules can endow nonwoven fibers with hydrophilic properties.

Polypropylene fibers were grafted with acrylic acid after electron irradiation, but the chemical structure of polypropylene molecular scouring did not change significantly. The fibers became thinner, the specific surface area was enlarged, and the water absorbency increased greatly.

　　 Irradiation grafting method The process is simple, energy saving, pollution-free and non liquid low temperature processing can be realized. Benzoyl amine emulsion is often used to initiate acrylic acid or methacrylic acid grafting onto polypropylene, introducing hydrophilic monomers and improving fabric wettability.

3. spinning with hydrophilic polymers. Before spinning, hydrophilic substances were added to the polymer melt and then spun by conventional spinning to obtain hydrophilic fibers.

For example, polyacrylate derivatives and polyethylene glycol derivatives can be blended with propylene, and polypropylene can be blended with some modified polypropylene to obtain hydrophilic fibers.

4. fibers are rough and irregular. The porous microporous polypropylene fiber produced by this process has higher porosity and larger surface area, which greatly improves the water absorbency of the fiber. It can also produce micropores when the polypropylene fiber is molded. The DuPont Co's Coolmax fiber is a cross section triangular polyester fiber.