Polyethylene fiber (ethylene fiber) refers to the fiber material obtained by spinning polyethylene by melt spinning, including short fiber and filament. The mechanical strength of this fiber can be adjusted by spinning process parameters, and the wet state The strength and elongation are the same as in the dry state. Polyethylene fiber has the advantages of high strength, low density, and good insulation, but its low heat bearing capacity and cold creep limit its application. It is mainly used in the production of various industrial textiles, especially It is filter material, tarpaulin and mesh belt and other products.

At present, there are two different production technology routes for high-performance polyethylene fibers: the high-volatile solvent (decalin) dry-process gel spinning process can be referred to as the dry-process route, and the other is the low-volatile solvent (mineral) Oil, white oil, etc.) wet gel spinning process route, referred to as wet route.

Among them, the dry route is to use high-volatile decalin as solvent and ultra-high molecular weight polyethylene powder as raw material, and use jelly dry spinning → ultra-multiple thermal stretching → solvent recovery system to integrate high-performance polyethylene The fiber, the spinning dope is extruded from the spinneret, and the decalin is vaporized and escaped to obtain a dry gel precursor, which is stretched at a high power to obtain a high-performance polyethylene fiber.

The wet route uses low-volatile substances such as mineral oil and white oil as solvents to prepare ultra-high molecular weight polyethylene spinning stock solution. bath) coagulation to obtain a wet gel precursor containing a low volatility solvent. The wet gel strands are extracted with high volatility and excellent extraction agent (Freon or other reagents) through a continuous extraction device for multi-stage extraction, and the extractant replaced in the gel strands is fully vaporized by a continuous multi-stage drying device. The chemical escapes to obtain dry gel filaments, which are stretched at high times to obtain high-performance polyethylene fibers.

The fiber strength and elongation of polyethylene fibers are similar to those of polypropylene fibers, and the moisture absorption capacity is also similar to that of polypropylene fibers, and the moisture regain is 0 under normal atmospheric conditions. It has relatively stable chemical properties, good chemical resistance and corrosion resistance. The heat resistance is poor, but the humidity and heat resistance is relatively good. Its melting point is 110-120 ° C, which is lower than that of other fibers, and the anti-porosity is very poor. Has good electrical insulation. The light resistance is poor, and it is easy to age under the irradiation of light.

Polyethylene fiber has poor wear performance, but in practical applications, its price is low, and it is suitable for making bristles, flat fibers or membrane split fibers, which are used to make ropes, filter cloths, packaging cloths, etc.