Research and development of nanocellulose in the field of functional coatings 1. Introduction Functional coating is a type of surface covering material that combines decoration and specific functions (such as waterproof, anti-fog, ultraviolet rays, barrier, conductivity, etc.), and is widely used in packaging, electronics, medical, textile and construction industries. With the increasing demand for green and environmentally friendly and high-performance materials, natural, renewable and functional nanocellulose (Nanocellulose) sources have gradually become an important substrate or additive for functional coatings. Nanocellulose provides excellent adhesion, film formation and functionalization potential for coatings with high mechanical strength, high transparency, controllable surface chemical structure and biocompatibility. 2. The mechanism of action of nanocellulose in the coating The framework enhances the high aspect ratio and high crystallinity to form a dense mesh structure, improving the wear resistance and stability of the coating. The barrier performance improves tightly arranged nanonetworks significantly extend the permeability path of gas or water vapor,
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