腰果酚型聚苯并噁嗪基超疏水涂层的制备及其性能

Preparation and Properties of Superhydrophobic Coatings Based on Cardanol Polybenzoxazine

首先合成了腰果酚型苯并噁嗪单体(C-a),然后采用旋涂和热固化的方法制备了腰果酚型聚苯并噁嗪/SiO_2(PC-a/SiO_2)超疏水涂层。通过傅里叶红外光谱(FT-IR)及核磁共振(NMR)等测试手段对单体结构进行了表征,并对PC-a/SiO_2涂层的超疏水性能进行了研究。结果表明,通过调控SiO_2纳米粒子的掺杂量,可制备水接触角为(166±4)°,滚动角为6°的"荷叶效应"型超疏水涂层和水接触角为(151±3)°的"玫瑰花效应"型超疏水涂层。该PC-a/SiO_2超疏水涂层具有良好的热稳定性和抗紫外性能。

Cardanol-based benzoxazine(C-a)was synthesized from cardanol,paraformaldehyde and aniline,and then superhydrophobic coating combined with cardanol-based polybenzoxazine.Silica nanoparticles(SiO2 NPs)were produced through spinning coating technique and thermal curing method.The chemical structure of C-a benzoxazine monomer was characterized by Fourier transform infrared(FT-IR)spectroscopy and nuclear magnetic resonance(NMR).Then,the polybenzoxazine coating(PC-a)was fabricated through thermal curing method and exhibited surface free energy of 22.5mJ/m2 after thermal curing at 200 ℃ for 1h.The wettability properties of PC-a/SiO2 coating were characterized by optical contact angle(OCA)meter.As a result,the water contact angle of pure PC-a coating was(104±2)°,showing a hydrophobic property.By incorporating different contents of SiO2 NPs,a "lotus effect" superhydrophobic PC-a/SiO2 coating with water contact angle of(166±4)°and water sliding angle of 6°,a"petal effect"superhydrophobic PC-a/SiO2 coating with water contact angle of(151±3)°could be both developed.After thermal treatment at 200℃ for 1h,the water contact angle and sliding angle of PC-a/SiO270 coating were(163±4)°and 7°,respectively.Therefore,the superhydrophobic PC-a/SiO270 coating could keep its stable superhydrophobicity with a wide range temperature.Moreover,the as-prepared hydrophobic PC-a coating still had hydrophobicity with a water contact angle of(97±1)°.Superhydrophobic PC-a/SiO270 coating could both keep stable after UV exposure for 8 h.So the hydrophobic PC-a coating and superhydrophobic PC-a/SiO270 coating had UV resistant property.In conclusion,this superhydrophobic coating based on cardanol polybenzoxazine shows excellent thermal stability and UV resistant property,which show broad application in the fields of oil-water separation and anti-corrosion.