▎ 摘　　要

NOVELTY - Method for preparing graphene composite fibers by (i) mixing graphene treatment agent with deionized water, adding graphene solution, heating and stirring, (ii) grinding polyester chips with the graphene powder and mixing using mechanical ball mill to obtain graphene-polyester composite powder, (iii) grinding biological protein powder, flame retardant, far infrared powder and polyester chips, mixing by mechanical ball milling to obtain multi-effect polyester composite powder, (iv) mixing and extruding the graphene-polyester composite powder, and polyester chips after drying, mixing in high-speed kneader, adding the mixture to extruder, pelletizing the strip to the pelletizer to obtain graphene-polyester composite masterbatch, and (v) drying and transferring feed into extruder for heating and melting, pressurizing, depressurizing, distributing through spinning box filter and metering pump, and spinning, cooling and forming tow using ring blowing, oiling, drawing and winding. USE - Method for preparing graphene composite fiber. ADVANTAGE - The composite fiber has excellent antibacterial, antistatic and flame retardant properties, and has softer feel and better skin affinity, improves physical and chemical properties of ordinary polyester fiber, and has widened scope. DETAILED DESCRIPTION - Method for preparing graphene composite fibers involves (i) mixing graphene treatment agent with deionized water, where the mass percentage of the graphene treatment agent is controlled between 5-10%, and adding 10-30 wt.% graphene solution, under nitrogen environment, heating and stirring for 1-1.2 hours and using pressure filter to dry the graphene powder after treatment, (ii) grinding polyester chips with the graphene powder in a mass ratio of 100:(2-5) and mixing using mechanical ball mill to obtain graphene-polyester composite powder, (iii) grinding biological protein powder, flame retardant, far infrared powder and polyester chips in a mass ratio of 3:1:1:100, mixing by mechanical ball milling to obtain multi-effect polyester composite powder, (iv) mixing and extruding the graphene-polyester composite powder obtained in step (ii), the multi-effect polyester composite powder obtained in step (iii), and polyester chips after drying, evenly mixing in the high-speed kneader, adding the mixture to the feed bin of the twin-screw extruder, after mixing and extruding under certain temperature conditions, transferring the strip to the pelletizer, pelletizing to obtain graphene-polyester composite masterbatch, and (v) drying the graphene polyester composite masterbatch obtained in step (iv), high-speed mixing, and transferring the feed into a screw extruder for heating and melting, pressurizing the molten mixture using booster pump and charging into an ultra-high pressure kettle, pressurizing at 300-500 MPa within 1-2 hours in the autoclave, after holding pressure for 4-6 hours, slowly depressurizing to normal pressure in 2-3 hours, distributing through the spinning box filter and metering pump, and spinning into a tow, cooling and forming the tow using ring blowing, oiling, drawing and winding to obtain the product.