关键词: 氧化石墨烯悬浮液（GO）, 水性环氧树脂（WEP）, 芳纶混纺纱线（ABY）, 浆膜性能, 纱线导电性

Abstract: " Conductive yarns serve as crucial materials in the production of smart wearable textiles; however, the issue of easy detachment of conductive coatings often leads to a decline in conductivity. Aiming at the structural design of conductive fillers and base yarns, this paper selected waterborne epoxy resin (WEP) with a structure similar to both as the polymeric binder for the conductive paste. Specifically, a combined conductive slurry comprising graphene oxide suspension (GO) and graphene oxide-waterborne epoxy resin (GO-WEP) was employed. By simply immersing aramid blended yarns (ABY) in this slurry followed by thermal reduction, graphene-coated conductive aramid blended yarns (rGO@rGO-WEP ABY) with excellent conductivity and good stability were prepared. Through investigating the film-forming properties, thickness and mechanical properties of WEP slurry films with different solid contents (10%, 15%, 20%, 25% and 30%), it was found that WEP slurry films with 20% solid content had better transparency and flexibility, making them suitable for the preparation of composite conductive slurries. Further testing of the film-forming properties and basic performance of GO-WEP slurry films revealed that GO could be uniformly dispersed in WEP, and the formed slurry films exhibited conductivity after thermal reduction. Conductivity tests were conducted on conductive aramid blended yarns subjected to different impregnation-thermal reduction cycles with GO suspension. The results showed that Sample 3, which underwent three impregnation-thermal reduction cycles, had the lowest resistance value and the best conductivity. When Sample 3 was repeatedly impregnated and thermally reduced in GO-WEP, the conductivity and weight gain rate of the resulting rGO@rGO-WEP ABY gradually decreased with the increase of impregnation-thermal reduction cycles. When the process was repeated once, the average resistance values of rGO@rGO-WEP ABY reached a minimum of 0.308 MΩ/1 cm and 1.416 MΩ/10 cm, which was sufficient to light up an ""XPU"" LED bulb. Scanning electron microscope (SEM) results indicated that WEP could improve the adhesion between the rGO@rGO-WEP ABY coating and the fibers. The rGO@rGO-WEP ABY prepared in this paper has excellent conductivity and stability, addressing the issues of easy coating detachment and poor stability in conductive yarns. It holds promising application prospects in the field of smart textiles."

Key words: graphene oxide suspension (GO), waterborne epoxy resin (WEP), aramid blended yarns (ABY), performance of slurry films, conductivity of yarn