摘要： 为提升乳胶的相容性及防腐性能，以没食子酸（ GA）与乙二醇丁醚（ BE）为原料合成没食子酸酯（ GA-BE）作为转锈剂，采用预乳化 -半连续种子乳液聚合法合成有机硅改性苯丙乳胶（ SAL-Si）作为成膜物，制备没食子酸酯 /改性苯丙防腐转锈乳胶（ GA-BE/SAL-Si）。采用稳定性分析仪测试乳胶的稳定性，采用中性盐雾测试、盐水浸泡测试和电化学分析探究其防腐性，采用 X射线衍射（XRD）、 X射线光电子能谱（ XPS）、扫描电镜（ SEM）和能谱（ EDS）分析探讨锈蚀转化前后基体表面形貌及转锈机理。结果表明：制备的 GA-BE/SAL-Si具有较好的稳定性；在 3. 5%NaCl溶液浸泡下，覆涂 GA-BE/SAL-Si试样的自腐蚀电流密度相较于锈蚀钢降低了 2个数量级，相较于覆涂 GA/SAL-Si试样降低了 1个数量级，当 GA-BE添加量为 2. 0%时，防腐效果最佳；经过 168 h的中性盐雾测试及盐水测试后，对比 GA/SAL-Si及 GA-BE/SAL涂膜， GA-BE/SAL-Si涂膜表现出更佳的防腐性能； GA-BE结构中的酚羟基可与锈蚀产物发生螯合反应，生成新的 Fe—O—C配位键，达到转锈的作用，配合 SAL-Si，使涂膜具有良好的防腐和转锈性能。
关键词:
转锈剂,
没食子酸酯,
苯丙乳胶,
有机硅改性,
防腐转锈乳胶
Abstract: In order to improve the stability and anticorrosive properties of the latex，gallic acid（GA）and butyl ethylene glycol ether（BE）were used as raw materials to synthesize gallic acid ester（GA-BE） as rust conversion agent，and silicone modified styrene-acrylic latex（SAL-Si） was synthesized by preemulsification-semi-continuous seeded emulsion polymerization as the film-forming material，so as to prepare gallic acid esters/modifiedstyrene-acrylic anticorrosive rust conversion latex（GA-BE/SAL-Si）. A stability analyzer was used to test the stability of the latex，neutral salt spray test，5%NaCl solution immersion test and electrochemical analysis were used to explore the corrosion resistance，and XRD，XPS， SEM，and EDS were used to analyze the surface morphology of the substrate before and after the transformation of the corrosion and the mechanism of the rust transformation. The results showed that the prepared GA-BE/SAL-Si had good stability；under 3. 5%NaCl solution immersion，the self-corrosion current density of the coated GA-BE/SAL-Si specimens wasreduced by 2 orders of magnitude compared with that of the rusted steel，and by 1 order of magnitude compared with that of the coated GA/SAL-Si specimens；the GA-BE/SAL-Si hadthe best corrosion protection effect when the GA-BE addition was 2. 0%；after 168 h of neutral salt spray test and 5%NaCl solution immersion test，GA-BE/SAL-Si coating film showedbetter corrosion resistance compared with GA/SAL-Si and GA-BE/SAL coating film；the phenolic hydroxyl group in the structure of GA-BE could chelate with corrosion to form newFe—O—C coordination bond，which could achieve the function of rust conversion，and together with SAL-Si，the coating film had good anticorrosive and rust conversion performance.
Key words:
rust conversion agent,
gallic acid esters,
styrene-acrylic latex,
silicone modified,
anticorrosive rust conversion latex
中图分类号:
刘银萍, 张光华, 杜佳妮, 等. 没食子酸酯 /改性苯丙防腐转锈乳胶的制备及性能研究[J]. 涂料工业, 2024, 54(10): 45-52.
LIU Y P, ZHANG G H, DU J N, et al. Preparation and performance study of gallic acid esters/modified styrene-acrylic anticorrosive rust conversion latex[J]. Paint & Coatings Industry, 2024, 54(10): 45-52.