▎ 摘　　要

NOVELTY - Preparing graphene fiber wool top comprises e. g. (i) taking graphene slice as raw material, drying in a vacuum drum device, heating the graphene slice material in the center of the drum to 58-62 degrees C, evacuating the drum device so that the degree of vacuum in the drum is -0.12 to -0.08 MPa, heating the drum to 135-145 degrees C for 2-3 hours, keeping the temperature for 7.5-8.5 hours, where the steam pressure during the heating process of the drum is 0.08-0.12 Mpa, and the steam pressure during the drum heat preservation process is 0.38-0.42 Mpa, cooling the drum by 0.8-1.2 hours, discharging the graphene material at 125-135 degrees C, reaching the moisture content of the graphene slice raw material after drying to 0.0038-0.0042%, mixing graphene slice with 65-70 g calcium stearate into the raw material of graphene chips per ton, and increasing the fluidity of the graphene chip material in the screw extrusion spinning process. USE - The method is useful for preparing graphene fiber wool top. ADVANTAGE - The wool top has antibacterial and bacteriostasis effect, good shielding property, good cohesive property, easy blending or interweaving effect, softness, drapability and excellent strength. DETAILED DESCRIPTION - Preparing graphene fiber wool top comprises (i) taking graphene slice as raw material, drying in a vacuum drum device, heating the graphene slice material in the center of the drum to 58-62 degrees C, evacuating the drum device so that the degree of vacuum in the drum is -0.12 to -0.08 MPa, heating the drum to 135-145 degrees C for 2-3 hours, keeping the temperature for 7.5-8.5 hours, where the steam pressure during the heating process of the drum is 0.08-0.12 Mpa, and the steam pressure during the drum heat preservation process is 0.38-0.42 Mpa, cooling the drum by 0.8-1.2 hours, discharging the graphene material at 125-135 degrees C, reaching the moisture content of the graphene slice raw material after drying to 0.0038-0.0042%, mixing graphene slice with 65-70 g calcium stearate into the raw material of graphene chips per ton, and increasing the fluidity of the graphene chip material in the screw extrusion spinning process; (ii) performing melt extrusion spinning of the graphene slice raw material in a screw extruder, driving the graphene chip material by a screw with a rotational speed of 45-55 m/second, preheating in one zone and two zones of the screw extruder in sequence, where the temperature in one zone is 252-258 degrees C, and the temperature in the second zone is 257-263 degrees C, melting through three zones and four zones in sequence, where the temperature of the three zones is 262-268 degrees C, and the temperature of the four zones is 262-268 degrees C, passing through the five zones and six zones in sequence, distributing the graphene powder quantitatively to each spinning station, performing extrusion spinning in the five zones at 258-263 degrees C, and in the six zones at 252-258 degrees C, obtaining the filament bundles by the spinning at each spinning station in a silk chamber at 28-32 degrees C for ring blow curing, where the air blowing volume of the ring is 1000-1200 m/second, and the temperature of the ring blowing air is 26-30 degrees C, and reaching the dry heat shrinkage of the obtained filament bundle to 42-48%; (iii) bundling the filament bundles sequentially through the feeding wheel and the traction roller group, obtaining a single-stranded graphene fiber tow, where the speed of the traction roller set and the feeding wheel are both 900-1000 n/minute; and (iv) passing multiple single-stranded graphene fiber tows through a tension roll set, tensioning and re-bundling on a tension roll set, obtaining a graphene fiber tow, immersing the graphene fiber tow in a polyester spinning oil for lubrication, and passing the graphene fiber tow through the first drafting roller set, where the rotation speed of the first draft roller set is the same as the rotation speed of the tension roller set, passing the graphene fiber tow through the first drafting roll set, subjecting to first oil bath, at 60-70 degrees C, where the oil concentration ratio is 0.5-0.7%, the oil bath is terylene fiber spinning oil, and passing the graphene fiber tow through the second drafting roller set, making the rotation speed of the second draft roller group is faster than the rotation speed of the first draft roller group, causing the graphene fiber tow to produce first draw of 3.5-3.8 times, sending the first drawn graphene fiber tow into a steam box, spray steaming at 90-95 degrees C, passing the graphene fiber tow through a third draft roll set, making the rotation speed of the third draft roller group is faster than the rotation speed of the second draft roller group, causing the graphene fiber tow to produce second draw of 1-1.3 times, rolling and preheating the second stretched graphene fiber tow at 97-107 degrees C, crimping the preheated graphene fiber tow on a crimper at 3.8-4.2 Mpa, at back pressure 2.8-3.2 Mpa, where the number of curls is 25-26/25 mm, heating the curled graphene fiber tow in three temperature segments, where the temperatures of the three temperature segments are 110-120 degrees C, 115-125 degrees C, and 110-120 degrees C, the heat setting time of each temperature zone is 10-14 minutes, and collecting the finished product tow in the barrel.