PP netting is a form of polypropylene (polypropylene).
Polypropylene:
The Chinese trade name for synthetic fibers such as polypropylene fibers made from propylene, a by-product of petroleum refining. Also known as polypropylene fiber.
English name: polypropylene fiber
Density: 0.91g/cm3[1]?
Specific gravity: 0.91
Properties: white powder
The synthetic fibers produced from propylene, a by-product of petroleum refining, are the Chinese trade name for polypropylene fiber. Also known as polypropylene fiber. Raw material sources are abundant, the production process is simple, the product price is relatively low compared to other synthetic fibers. Physical and mechanical properties of the fiber is characterized by: high strength (staple fibers for 4-6 g / denier, filament for 5-8 g / denier), wet strength and dry strength is basically the same, specific gravity is small (0.91), wear-resistant corrosion resistance. World annual output of polypropylene fiber in 1980 has more than 1 million tons.
Explanation
It is made of propylene as raw material by polymerization, melt spinning fiber. Polypropylene in 1957 officially began industrial production, is a synthetic fiber in the latecomer. As polypropylene has a simple production process, inexpensive products, high strength, relative density and other advantages, so polypropylene developed very quickly. Currently polypropylene has been the fourth largest variety of synthetic fibers, is the most common chemical fiber in the lightest fiber.
Polypropylene production, including staple fibers, filaments and split membrane fibers. Polypropylene membrane fiber is made of polypropylene film, and then stretch the film, so that it splits into the original fibers into a network and produced.
Varieties
The varieties of polypropylene are filament (including undeformed filament and expanded deformed filament), staple fiber, bristle fiber, membrane split fiber, hollow fiber, shaped fiber, a variety of composite fibers and nonwoven fabrics. The main use is the production of carpets (including carpet backing and pile), decorative fabrics, furniture cloth, a variety of ropes, strips, fishing nets, absorbent felt, building reinforcement materials, packaging materials and industrial fabrics, such as filter fabrics, bag cloth, etc.. In addition, the application of clothing is also increasingly widespread, can be blended with a variety of fibers to make different types of blended fabrics, after knitting can be made into shirts, outerwear, sportswear, socks and so on. By the hollow fiber made of polypropylene flocculent, lightweight, warm, good elasticity.
Structure
Polypropylene in the macromolecular structure does not contain chemical groups that can be combined with dyes, so dyeing is more difficult. Usually use melt coloring method, the pigment preparation and polypropylene polymer in the screw extruder evenly mixed, after melt spinning to get colored fiber color fastness is very high. Another method is with acrylic acid, acrylonitrile, vinyl pyridine, etc. *** polymerization or grafting *** polymerization, so that the polymer macromolecules on the introduction of polar groups that can be combined with the dyes, and then directly with the conventional method of dyeing. In the process of polypropylene production often need to add a variety of additives to improve the dyeing, light resistance and flame resistance.