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紫外光固化漆酚铈聚合物涂层的制备与性能研究

Preparation and Properties of UV-curable Urushiol-cerium Polymer Coatings

  • 摘要: 以稀土化合物氯化铈和漆酚为原料,在无引发剂的条件下利用紫外光(UV)辐照法制备漆酚铈聚合物涂层。采用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)、热重分析(TG)等测试方法对涂层的结构和热稳定性进行了表征。考察了氯化铈用量对涂层的物理机械性能和耐化学介质性能的影响,并对制备的漆酚铈涂层进行电化学阻抗测试(EIS),结果表明:在UV辐照条件下,漆酚羟基与铈离子发生配位作用,同时侧链不饱和键发生交联聚合反应从而固化;掺杂氯化铈可显著改善天然生漆(RL)固化膜的热稳定性和耐碱性;随着氯化铈掺杂量的增加,涂层的附着力、硬度、耐腐蚀性能呈先上升后下降的趋势。氯化铈用量为18%的漆酚铈聚合物复合涂层的硬度和附着力分别达到6H和1级,且其耐腐蚀性能最佳。

     

    Abstract: Urushiol-cerium polymer (UCeP) coatings were prepared via UV-curing process without initiator using CeCl3 and urushiol as raw materials. The structure and thermal stability of the coatings were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermal gravimetric analysis (TG). The effects of CeCl3 amount on the physical-mechanical properties and chemical medium resistance of the polymer coatings were investigated. The electrochemical impedance spectroscopy (EIS) tests were also carried out on the prepared urushiol-cerium coatings. The results showed that under the irradiation of UV urushiol hydroxyl coordinated with cerium ions, meanwhile, the unsaturated bonds in the side chain of urushiol underwent cross-linking polymerization, resulting in the curing of the coatings. Doping CeCl3 could significantly improve the thermal stability and alkali resistance of raw lacquer(RL) film. With the increase of CeCl3 amount, the adhesion, hardness and corrosion resistance of the coatings first increased and then decreased. The hardness and adhesion of urushiol-cerium polymer coating with the CeCl3 amount of 18% reached 6H and 1 grade, respectively, and its corrosion resistance was the best.

     

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