▎ 摘　　要

NOVELTY - Improving strength of polyester staple fiber, involves using modified nano-alpha-alumina, modified nano-graphene and polyester chips as raw materials, melting and extruding to obtain modified masterbatch. The dried modified masterbatch is sent to a spinning device with a melt filter for spinning to obtain primary fibers, where spinning temperature of the spinning device is 290-295degrees Celsius, and the spinning speed is 1100-1250 m/min. The spun fiber is cooled by the ring blowing device, and then the spun fiber is oiled, wound, and doffed in turn to obtain the original fiber. The prepared raw silk is subjected to post-processing of oil immersion drafting, water bath drafting, steam drafting, heat setting, cutting, and packaging to obtain the target polyester staple fiber. The mixing ratio of the modified nano-alpha-alumina, modified nano-graphene and polyester chips is 0.2-0.7:0.1-20:100. USE - Method for improving strength of polyester staple fiber ADVANTAGE - The method improves the properties of the prepared polyester staple fibers such as breaking strength, and the method is simple to process. DETAILED DESCRIPTION - Improving strength of polyester staple fiber, involves using modified nano-alpha-alumina, modified nano-graphene and polyester chips as raw materials, melting and extruding to obtain modified masterbatch. The dried modified masterbatch is sent to a spinning device with a melt filter for spinning to obtain primary fibers, where spinning temperature of the spinning device is 290-295degrees Celsius, and the spinning speed is 1100-1250 m/min. The spun fiber is cooled by the ring blowing device, and then the spun fiber is oiled, wound, and doffed in turn to obtain the original fiber. The prepared raw silk is subjected to post-processing of oil immersion drafting, water bath drafting, steam drafting, heat setting, cutting, and packaging to obtain the target polyester staple fiber. The mixing ratio of the modified nano-alpha-alumina, modified nano-graphene and polyester chips is 0.2-0.7:0.1-20:100. The moisture content of the dried modified masterbatch is less than 50 ppm. The total drafting ratio of the oil immersion drafting and the water bath drafting is 4.8, and the drafting ratio is 88:12. An INDEPENDENT CLAIM is included for a preparation device for improving the strength of polyester staple fiber, where modified nano-alpha-alumina, modified nano graphene and polyester chips are used as preparation raw materials, and carried out preparation of the target polyester staple fiber is according to the preparation method.