The development of a multifunctional wood wax oil-based coating holds significant importance in meeting demands for wood protection and enhanced longevity of wood materials. Nevertheless, a simple method of developing such an integrated coating that possesses excellent durability, ultraviolet (UV) resistance, water resistance, and environmental friendliness remains a significant obstacle. In this paper, stearoyl chloride-grafted cellulose nanocrystals (SCNCs) with excellent compatibility with wood wax oil (WWO) coatings were prepared by combining cellulose nanocrystals (CNCs) with stearoyl chloride through a one-step non-homogeneous esterification reaction. Nanocomposite coatings were prepared by a simple one-step ultrasonic miscibility method using SCNCs as modified functionalized fillers. The prepared SCNC-WWO wood coatings had high hardness (grade H), strong adhesion (class 0, with no peeling), high abrasion resistance , good UV resistance, high hydrophobicity (water contact angle of 116°), and good water resistance (maintainable for 1 day). In addition, SCNCs with gas barrier properties can effectively inhibit the release of pollutants within the coatings, making this composite coatings environmentally friendly. Therefore, SCNC-WWO can be used as a high-performance coating for substantial protection of wood in harsh environments, and the strategy for developing it provides insight into the preparation of multifunctional wood paint.
Bamboo scrimber (BS) as an engineering material has been widely used in outdoor areas, in order to improve the protective properties of bamboo scrimber, this study prepared a new composite coating. Wood wax oil (WO) and Zeolitic Imidazolate Framework-8 (ZIF-8) nanoparticles were prepared separately, and ZIF-8 nanoparticles were modified with low surface energy perfluorooctyltriethoxysilane (POTS). ZIF-8/POTS nanoparticles were constructed on the surface of bamboo scrimber to form ZIF-8/POTS/WO/BS composite coatings via the mediating effect of wood wax oil. The composite coatings were superhydrophobic, with a water contact angle of 161.4°. After aging tests, the contact angle of the composite coatings decreased by only 6.51 %, indicating that they remained superhydrophobic. Compared with uncoated substrates, after anti-mildew and preservative treatment tests, the bamboo scrimber coated with ZIF-8/POTS/WO/BS showed an improvement in its discoloration level from grade 4 to grade 1 and an infection level improvement from grade 3 to grade 0. The composite coatings had a nanoscale surface roughness with a surface energy of 2.94 mJ/m 2 . The coatings also exhibited self-cleaning performance, with a dust removal efficiency of 90.91 %. The air layer created on the surface of the composite coating made it difficult for water and microorganisms to directly contact the surface of the coatings. Furthermore, The Zn 2+ ions and 2-methylimidazole released by ZIF-8 disrupted the ionic balance in the surrounding environment, achieving a dual synergistic antifungal effect, which inhibited microbial growth and reproduction on the surface of the coatings, thus providing greater outdoor protection. This work pioneered the use of MOFs and wood wax oil to construct superhydrophobic, self-cleaning, and weather-resistant composite coatings on bamboo scrimber. This coating may enable bamboo scrimber to be used in outdoor building structures, highway guardrails, and bridge components, especially in harsh and wet outdoor environments.
危险品化学品经营许可证（带存储）