UVSA/SA@LDH共插层复合材料的制备与性能OA

With the growing market demand for multifunctional textiles,developing novel integrated functional additives to achieve stable,efficient,and synergistic antibacterial and ultraviolet(UV)-resistant properties has become an important research direction.In this study,by leveraging the characteristics of layered double hydroxides(LDHs)with tunable host layers and exchangeable guest anions,a one-step co-precipitation method was employed to successfully co-intercalate the UV absorber 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid(UVSA)and the bio-based antibacterial agent salicylic acid(SA)into the interlayer space of ZnAl-LDH,constructing a new type of co-intercalated composite(designated as UVSA/SA@LDH).For comparative research purposes,the corresponding single-intercalated materials(UVSA@LDH and SA@LDH)were also prepared. The resultant materials were systematically characterized by using scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),thermogravimetric analysis(TG)and other techniques.The results indicated that both functional anions were successfully intercalated,as evidenced primarily by the expansion of interlayer spacing and changes in chemical composition.However,compared with the original NO-3-LDH,the crystallinity of the modified materials decreased slightly.Performance tests show that the prepared UVSA/SA@LDH composite exhibited exceptional and broad-spectrum UV absorption properties in the 250-400 nm UV band.Its performance was superior to that of SA@LDH,and although slightly lower than that of UVSA@LDH specialized in UV shielding,it achieved the optimal balance of dual-functional attributes.More importantly,antibacterial tests against Staphylococcus aureus demonstrate that the antibacterial rate of UVSA/SA@LDH reached approximately 96%,significantly higher than that of UVSA@LDH(86.67%)and nearly equivalent to that of SA@LDH(98.33%).This fully confirmed the dominant role of SA in antibacterial performance and the effectiveness of the co-intercalation strategy.Furthermore,the study prepared functional films by adding UVSA/SA@LDH to polypropylene(PP)via melt blending to evaluate its practical application potential.The results showed that the resulting UVSA/SA@LDH/PP composite film had extremely low UV transmittance(while maintaining a light transmittance of approximately 80%in the visible light region above 450 nm)and retained an antibacterial rate as high as 94%,proving that the functional additive possessed good durability and functional persistence in the polymer matrix. This study successfully verifies the co-intercalation strategy as a highly effective approach for integrating multiple functions into a single LDH carrier.The UVSA/SA@LDH composite showcases remarkable synergistic effects,integrating robust UV-shielding capability and reliable antibacterial activity,thereby offering a promising and versatile novel finishing agent for the development of high-performance multifunctional textiles.This study not only offers new materials for the development of multifunctional textiles but also provides new ideas and theoretical basis for the design of other LDH-based integrated functional additives,holding significant scientific research value and practical application potential.