无皂苯胺/硅丙共聚乳液的制备及其防腐蚀性能

Preparation of Emulsifier-free Aniline/Silicone-Acrylate Copolymer Emulsion and Its Anticorrosion Properties

摘要:

采用无皂乳液聚合法，通过在乙烯基三甲氧基硅烷（VTMS）改性的丙烯酸酯乳胶粒子表面接枝苯胺（Ani），制备了无皂苯胺/含硅丙烯酸酯（苯胺/硅丙）共聚乳液。通过FTIR和TEM对其进行了表征，采用极化曲线和电化学阻抗谱（EIS）对其乳胶膜的防腐蚀性能进行了研究。讨论了不同反应温度、氧化剂H2O2与Ani的物质的量的比对共聚乳胶膜的防腐蚀性能的影响。结果表明：当反应温度为20°C反应6 h、再升温至80°C反应2 h，n（H2O2）：n（Ani）=2.5：1时，苯胺/硅丙乳胶膜电化学阻抗值达到9.03×107 Ω•cm2，腐蚀电流密度仅为5.04×10-8 A/cm2。

Abstract:

Aniline/silicone-acrylate(Ani/SiAc) copolymer emulsion was prepared by emulsifier-free emulsion polymerization through grafting aniline(Ani) on vinyltrimethylsilane(VTMS) modified acrylate latex particles. The emulsion was characterization by FTIR and TEM, the anticorrosive property of its latex film was studied by polarization curves and electrochemical impedance spectra (EIS). The effect of temperature and the molar ratio of H2O2 and Ani to the anticorrosive property were discussed. The results showed that the electrochemical impedance value of Ani/SiAc copolymer latex film was 9.03×107 Ω•cm2 and the corrosion current density was merely 5.04×10-8 A/cm2 when the react temperature was 20°C for 6 h firstly, then 80°C for 2 h, and n(H2O2): n(Ani) was 2.5:1.