【作者】 黄立；

【导师】 齐公台；

【作者基本信息】 华中科技大学 ， 应用化学， 2007， 硕士

【摘要】 液态环境下细菌能够在固体材料表面附着进而形成生物膜,由于生物膜本身对氧气的消耗导致在靠近材料的表面生物膜下层形成无氧区或缺氧区,SRB能够在此环境下生存。而SRB是引起微生物腐蚀的主要菌种之一,为了减缓生物膜的形成,抑止SRB引起的微生物腐蚀,本文旨在开发一种抗菌涂料抑止SRB生物膜的形成。本文通过在使用环氧酚醛树脂为基础材料,采用化学接枝、添加有机杂环抗菌剂、无机抗菌剂以及纳米高分子复合材料等,研究所得复合涂层的抗硫酸盐还原菌的性能。并对其物理机械性能、耐腐蚀性能和抗菌性能进行评价,从而得到最优的抗菌涂料。研究结果如下:成膜树脂上接枝季铵基后,所得复合涂料抗菌性能好,但涂料耐腐蚀性能不佳;通过化学还原法合成的纳米Cu2O,其粒径约为30nm,分散到酚醛树脂中所得涂料,其抗菌性能较好,但涂层耐酸碱腐蚀性能较差;以二氧化钛纳米溶胶为基础,采用原位化学氧化聚合得到TiO2/PANI纳米复合材料,对铁细菌以及革兰氏阳性细菌抗菌效果明显,但对革兰氏阴性菌SRB效果不明显;直接添加溶解度较小的甲硝唑,所得的抗菌涂层,抗菌效果最好,且涂层机械和耐腐蚀性能均达到国家标准。甲硝唑涂层的耐腐蚀性能研究表明,涂料漆膜浸泡在SRB菌液中3个月,与未加杀菌剂的涂料漆膜进行比较,前者表面无SRB生物膜存在,后者表面有SRB生物膜存在。环境扫描电镜分析发现,含甲硝唑杀菌剂涂料漆膜表面腐蚀产物比一般防腐涂料表面的细菌腐蚀产物少得多。腐蚀产物进行能谱分析表明,产物中S元素与Fe元素的摩尔数比为1:1,说明腐蚀产物中Fe、S含量与硫酸盐还原菌的代谢产物一致。显示含甲硝唑杀菌剂SRB抑菌涂料具有很强的抑制SRB菌在涂料表面粘附、生长的能力。更多还原

【Abstract】 Sulfate Reducing Bacteria (SRB) is a main corrosion strain. In the corrosion process, SRB can accumulate on the surface of steel, and then accelerate biocorrosion. In order to control biocorrosion, preventing metal from SRB and its biofilm is very important. In this thesis, we hope to prepare an anti-bacteria coating to control SRB.Base on the anticorrosion coat, the new polymer quaternary ammonium salt was synthesized from epoxy phenolic resin via ring-opening reaction with aqueous solution of triethylamine hydrochloride, or adding the anti-bacteria agents into the anticorrosion coating. Using the two ways, preparing the Sulfate-Reducing Bacteria(SRB) anti-bacteria coat, and evaluating the anticorrosion property、mechanical properties and anti-bacteria property.Through the filtrating, the metronidazole anti-bacteria agent can be dispersed in the epoxy phenolic resin. The anti-bacteria coat including the metronidazole was prepared. The heat-resistanting property, anticorrosion property and mechanical properties were evaluated. The results showed that the coating have good properties. These coatings were exposed to SRB media for 3 monthes. And then, the samples were taken out for surface analysis. Comparing with the control sample, using the Scan Electronical Microscope (SEM) to observe the surface, we find that there is no biofilm on the surface of the former. The EPXA data show that the corrosion products are FeS of control sample. This expresses the results of corrosion is the SRB metabolizing results. For a word, the anti-bacteria coating which includes the metronidazole can prevent the SRB accumulating to the surface of the coating and growth.更多还原