Abstract
In this study, we synthesized CO2-based polyurethane (PU) as a wood coating through the reaction of CO2-polyol with isocyanate and explored its properties such as heat resistance, acid and alkali resistance, hydrophobicity, and flame retardancy. From the results, the modulus of rupture (MOR) and modulus of elasticity (MOE) of PU wood coatings are 150.60 and 2524.45 MPa, respectively, and the hydrophobic angle is 115°, but they do not have good acid/alkali and salt resistance. At the same time, the flame retardant effect is also poor with the limiting oxygen indexes (LOI) of 24.5 %. Therefore, PU was modified after the synthesis of bio-based benzoxazine (BZ) to prepare PU/BZ 3D interpenetrating network system, which is versatile and practical as wood coatings. In contrast, the PU/BZ wood coatings exhibited a higher value of MOR and MOE of 2979.01 and 176.63 MPa and exhibited a super-hydrophobicity of 150°. They are also stronger than PU coatings in terms of acid/alkali and aging resistance. At the same time, it endows the coating with flame retardant properties, and the LOI is 30.1 due to the existence of BZ. Therefore, the interpenetrating network system of PU/BZ has an innovative impact on the preparation of wood coatings.
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