Boron-Based Mildew Preventive and Ultraviolet Absorbent Modification of Waterborne Polyurethane Coatings on Laminated Bamboo

In order to improve the outdoor exposure performance of laminated bamboo, boric acid/borax and UV absorbents, including triazole (UV1130), nano–TiO2, nano–SiO2, were used modify waterborne polyurethane (WPU) coatings, respectively. The physical chemical properties coatings with without modification evaluated by adhesion strength, contact angle, wear, temperature-resistance experiments. antimildew bacteriostatic zone method, pyrolysis characteristics investigated through TG–FTIR analysis. results showed that, when compared unmodified WPU coating, different modifications had stronger wear resistance; mass loss best C4 coating was only 0.0078 g, which 0.0203 g less than that C0 coating. However, wettability modified increased degrees, angle most obvious effect 36.50°. During curing process absorbents would interact C–N, C–O, C=O bonds in change molecular structure WPU. thermal stability enhanced. result, a 76.27% weight loss, observed 1.0% nano–TiO2. Different certain degree control on Aspergillus Niger, reason for this considered combined absorbents.