Chemical composition and material structure of artificial turf
Artificial grass is a kind of synthetic fiber that imitates grass leaves, implanted on the woven base cloth, and coated on the back with a fixed coating which has the movement performance of natural grass chemical products. Widely used in sports and leisure venues.
Chemical composition:
Its raw materials are mainly polyethylene (PE) and polypropylene (PP), and can also be used polyvinyl chloride and polyamide. Leaves with imitation of natural grass green, and need to add ultraviolet absorbent.
Polyethylene (PE) : feel more soft, appearance and movement performance more close to natural grass, widely accepted by users. It is the most widely used raw material of artificial grass fiber on the market.
Polypropylene (PP) : grass fiber is hard, generally suitable for tennis courts, playgrounds, runways or decorative purposes. Slightly worse wear resistance than polyethylene.
Nylon: Nylon is the earliest raw material of artificial grass fiber, which belongs to the first generation of artificial grass fiber.
Material structure:
Artificial grass is made up of three layers of material. The base layer is composed of compacted soil layer, gravel layer and asphalt or concrete layer. The base layer requires solid, non-deformation, smooth surface and impermeable, that is, the general concrete site. Because hockey field area is large, construction must deal with the base layer, prevent subsidence. If spread concrete layer, after concrete solidification should cut expansion joint, prevent thermal expansion deformation and crack.
Above the base layer is a buffer layer, usually made of rubber or foam. Rubber has moderate elasticity and thickness of 3~5mm. The foam plastic cost is low, but the elasticity is poor, the thickness is 5~10mm, the thick lawn is too soft, and easy to sag; Too thin and lack of elasticity to play a cushioning role. Buffer layer should stick up firmly on the base layer, stick up with white latex or universal glue commonly.
The third layer, also the surface layer, is the grass cortex. According to the surface shape of the manufacture of villous turf, circular curly nylon silk turf, leaf-shaped polypropylene fiber turf, nylon woven permeable turf. This layer must also be glued to rubber or foam with latex. Construction must be fully coated with glue, in turn pressure close to the firm, can not be wrinkled.
There are two common types of grass cortex in foreign countries: 1. The grass cortex has thin leaf-like fibers, only 1.2~1.5mm; 2. 2. Turf fiber is thick, 20~24mm, and it is filled with quartz almost to the top of the fiber.
