How to improve the performance of polypropylene yarn?

Here are some ways to improve the performance of polypropylene yarn:

Raw material modification

Copolymerization modification: By choosing different copolymerization monomers to copolymerize with propylene, various functional groups can be introduced to improve the performance of polypropylene yarn. For example, the introduction of monomers containing hydrophilic groups, such as acrylic acid, maleic anhydride, etc., can improve the hygroscopic performance of polypropylene yarn, making it more suitable for clothing and other fields; The introduction of monomer containing flame retardant groups can enhance the flame retardant property of polypropylene yarn and expand its application in fire resistant fabrics.

Grafting modification: The chemical grafting method is used to attach a specific group or molecular chain to the molecular chain of the polypropylene yarn to give it new properties. For example, the molecular chain of anti-ultraviolet absorbent on the graft can effectively improve the light resistance of polypropylene yarn and extend its life in outdoor use; The molecular chain of the grafted antibacterial agent can make the polypropylene yarn have antibacterial function and be used for the production of fabrics in medical and health fields.

Process optimization

Spinning process optimization: Precise control of spinning temperature, pressure, speed and other parameters can make the fiber diameter of polypropylene yarn more uniform, reduce defects, thereby improving its strength, modulus and other mechanical properties. For example, properly increasing the spinning temperature can reduce the viscosity of the melt and make the forming of the fiber more uniform. Reasonable control of the spinning speed can make the fiber better orientation during the stretching process and enhance the strength of the fiber.

Drawing process optimization: the stretching treatment of polypropylene yarn can change the orientation and crystallinity of its molecular chain, and then improve the mechanical properties of the fiber. By means of multistage stretching and gradually increasing the stretching times, the orientation of the fibers can be more fully and the strength can be significantly improved. At the same time, controlling the drawing temperature and drawing speed can also affect the drawing effect and performance of the fiber.

Heat treatment process optimization: Heat setting treatment is an important heat treatment process, through the heat setting of polypropylene yarn under a certain temperature and tension conditions, the molecular chain can be rearranged to improve the dimensional stability and shape memory of the fiber. For example, when producing polypropylene yarn for carpets, the polypropylene yarn after heat setting can better maintain the shape of the carpet and is not easy to deform.