聚乙烯醇/改性纤维素纳米纤维/纳米二氧化钛抗菌防水涂层的制备及其性能研究OA

Polyvinyl alcohol(PVA)coatings,used as wood adhesives,were widely applied for bonding various types of wood.However,PVA coatings were susceptible to moisture absorption and bacterial contamination,which led to the loss of their protective functions.To improve the durability and functionality of wood products,an antibacterial and waterproof wood coating was developed.The coating was prepared using PVA as the matrix,incorporating phenyltrimethoxysilane-modified cellulose nanofibers(M-CNF)and titanium dioxide(TiO2)nanoparticles to optimize the coating structure and properties.The results showed that PVA exhibited almost no antibacterial activity against Escherichia coli and Staphylococcus aureus,whereas the PVA/M-CNF/3%TiO2 coating samples demonstrated excellent antibacterial performance.The water resistance of the PVA coating was poor.However,after the addition of M-CNF and TiO2 nanoparticles,the water resistance of the PVA/M-CNF/3%TiO2 coating was significantly improved,with an initial contact angle of 81.3°,which only decreased to 79.8° after 10 s,representing a reduction of only 1.5°.This coating not only exhibited remarkable short-term waterproof performance but also demonstrated good long-term water stability.The initial adhesion strength between the PVA/M-CNF and PVA/M-CNF/3%TiO2 coatings and the wood substrate was significantly higher than that of PVA.After 30 d of natural weathering,the adhesion strength of PVA decreased drastically by 78.6%,while that of the two composite coatings decreased by only 9.7%and 4.6%,respectively.The research findings provided a valuable reference for the development of efficient and environmentally friendly wood coatings,as well as eco-friendly multifunctional wood coatings.