Today we unveil the mystery of pp yarn raw materials together!

The raw material of pp yarn is polypropylene. So what is polypropylene? Polypropylene is the Chinese trade name of synthetic fiber isotactic polypropylene fiber made from propylene, a by-product of petroleum refining. Also known as polypropylene fiber. The raw materials are abundant, the production process is simple, and the product price is relatively cheaper than other synthetic fibers. It is a fiber obtained by polymerizing and melt spinning a propylene material.

Polypropylene officially began industrial production in 1957, and is a rising star in synthetic fiber. Because polypropylene has a simple production process, low price, high strength, and relatively low density, polypropylene has developed very quickly. At that time, polypropylene was the fourth largest type of synthetic fiber, and it was the lightest fiber among chemical fibers. The production of polypropylene includes short fibers, filaments and split fibers. The polypropylene film fiber is obtained by first forming a film into a film, and then stretching the film to split it into a network of fibrils.

Polypropylene varieties include filaments (including undeformed filaments and expanded filaments), staple fibers, silk, membrane fibers, hollow fibers, shaped fibers, various composite fibers, and non-woven fabrics. The main purposes are to make carpets (including carpet backing and suede), decorative fabrics, furniture fabrics, various ropes, strips, fishing nets, oil absorbing felts, building reinforcements, packaging materials and industrial fabrics, such as filter cloth, bag cloth. Wait.

In addition, it is also widely used in clothing. It can be blended with various fibers to make different types of blended fabrics. After knitting, it can be made into shirts, outerwear, sportswear, socks and so on. The floc made of polypropylene hollow fiber is light in weight, warm and has good elasticity. Polypropylene does not contain chemical groups that can communicate with dyes in macromolecular construction, so dyeing is difficult. Generally, the melt coloring method is adopted, and the pigment preparation and the polypropylene polymer are uniformly mixed in a screw extruder, and the color fastness of the colored fiber is obtained by melt spinning.

Another method is copolymerization or graft copolymerization with acrylic acid, acrylonitrile, vinyl pyridine, etc., to introduce a polar group capable of communicating with the dye on the macromolecule of the polymer, and directly dyeing by a conventional method. In the process of polypropylene production, it is often necessary to participate in various additives to improve dyeability, light resistance and flame resistance.

Now, you must have a certain understanding of the raw materials of pp yarn!