Enhancement of Mechanical Properties, Adhesion Strength, Ultraviolet Shielding, and Antifungal Effect in Graphene Composite Fibers for Beauty Products

Purpose: This study evaluates the feasibility of utilizing polybutylene terephthalate (PBT) fibers in cosmetic products such as artificial eyelashes and makeup brushes by incorporating reduced graphene oxide and modifying fiber cross-sectional geometry to improve lightness, adhesion strength, mechanical properties, ultraviolet (UV) shielding, and dimensional stability.Methods: Graphene was integrated into the PBT polymer, and fibers with circular and cross-shaped cross sections were fabricated. These fibers were assessed for lightness, adhesion strength, tensile strength, and elongation at break. Additionally, dimensional stability under dry heat and hot water, UV shielding efficiency, and antifungal performance were evaluated.Results: The transition from circular to cross-shaped fiber geometry reduced fiber mass, enhancing lightness. Improved interfacial contact during bonding resulted in increased adhesion strength. The incorporation of graphene, even in small quantities, significantly enhanced tensile strength and elongation, maintained dimensional stability under thermal and hydrothermal conditions, and imparted effective UV shielding and antifungal properties.Conclusion: The synergistic effect of graphene incorporation and cross-shaped fiber design significantly improved the lightness, adhesion strength, mechanical performance, dimensional stability, UV shielding, and antifungal activity of PBT fibers, indicating their practical applicability for cosmetic applications.