紫外光-热双固化聚苯胺防腐涂料

doi:10.11944/j.issn.1000-0518.2016.05.160100

摘要/Abstract

摘要：

以酸性磷酸酯为掺杂剂对本征态聚苯胺(EB)进行掺杂,制备了可在聚氨酯和聚氨酯丙烯酸酯中进行纳米分散的导电聚苯胺(ES),其粒径分布在80~750 nm之间可控。在此基础上,制备了不含重金属的紫外光-热双固化聚苯胺防腐涂料。该防腐涂料先后经过3~5 s紫外光固化和80 ℃下1~3 min的热固化,即可完成紫外光-热双固化过程。由于ES与聚氨酯或聚氨酯丙烯酸酯之间是不相容体系,因此随着ES质量分数的增大,会导致ES的团聚,分散粒径增大。当ES质量分数从1.0%增大到5.0%时,ES的粒径从80~119 nm增加到500~750 nm。 ES的分散粒径增大会导致防腐涂层的致密性变差,降低防腐效果。与普通紫外光固化聚苯胺防腐涂层相比,当ES为1.0%时,紫外光-热双固化防腐涂层在质量分数为3.5%的NaCl水溶液中浸泡2160 h后,其0.1 Hz下的绝对阻抗值(|Z|_{0.1 Hz})仍高于1.0×10⁸ Ω·cm²,优于普通紫外光固化聚苯胺防腐涂层的|Z|_{0.1 Hz}(1.0×10⁷ Ω·cm²),表明紫外光-热双固化涂层的防腐效果有了显著改善。经过500 h划叉中性盐雾试验后,普通紫外光固化防腐涂层的板面出现了锈蚀宽度小于1 mm的锈蚀,而紫外光-热双固化防腐涂层经过500 h划叉中性盐雾试验,板面没有出现生锈、起泡的现象,表明紫外光-热双固化路线对提高涂层的防腐性能具有较大的价值。

关键词: 聚苯胺, 紫外光-热双固化, 防腐涂层

Abstract:

Conducting polyaniline(ES) was prepared using acidic phosphate(HPAA) as dopant of emeraldine base(EB), which can be dispersed in nanoscale in the polyurethane or polyurethane acrylates based matrix, subsequently, ultraviolet-thermal double cured polyaniline anti-corrosion coating without any heavy metals was prepared. The anti-corrosion layer was obtained by ultraviolet light curing in 3~5 s and subsequent thermal curing at 80 ℃ in 1~3 min. Particle size of ES increases with increasing mass fraction of ES in the coating matrix, meanwhile, the aggregation of ES molecules is enhanced. This is because ES is not miscible in polyurethane or polyurethane acrylates in the coating system. The particle size of ES can be controlled between 80 nm and 750 nm, it is ca. 80~119 nm when the mass fraction of the ES in the coating is 1.0%, and is increased to 500~750 nm when mass fraction of ES is 5.0%. The increase of particle size of ES is accompanied by the increase of porosity of anti-corrosion coating, leading to poorer anti-corrosion performance. The absolute impedance at 0.1 Hz(|Z|_{0.1 Hz}) of 1.0 % ES anti-corrosion coating protected mild steel can maintain 1.0×10⁸Ω·cm² after 2160 h immersion in 3.5% NaCl solution, while that from UV curing coating protected mild steel is 1.0×10⁷ Ω·cm²,indicating better anti-corrosion performance of this double cured coating. The double cured anti-corrosion coating does not show any red rust and blister after 500 h cross scratch neutral salt spray test, while the rust is observed in the UV-cured anti-corrosion coating, though the rusted frontier around the scratch is still less than 1 mm.

Key words: polyaniline, ultraviolet-thermal double curing, anti-corrosion coating

孙杨, 张红明, 吕金龙, 王献红, 王佛松. 紫外光-热双固化聚苯胺防腐涂料[J]. 应用化学, 2016, 33(5): 524-532.

SUN Yang, ZHANG Hongming, LYU Jinlong, WANG Xianhong, WANG Fosong. Ultraviolet-Thermal Double Cured Anti-corrosion Coating Based on Nano-dispersed Conducting Polyaniline[J]. Chinese Journal of Applied Chemistry, 2016, 33(5): 524-532.

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