光敏磷酸酯掺杂聚苯胺光固化涂层的制备及其耐腐蚀性探究

doi:10.12020/j.issn.0253-4312.2023-025

摘要/Abstract

摘要： 为研制一种高性能绿色环保光固化防腐涂料，选用质子酸（特戊酸、乳酸和 2，2-二羟甲基丙酸）与甲基丙烯酸缩水甘油酯（GMA）先发生开环反应引入光敏基团，再与焦磷酸磷酸化改性制备了一系列不同磷酸根含量的光敏磷酸酯，将其用于掺杂聚苯胺（ PANI）并将掺杂聚苯胺作为防腐填料制备 UV固化防腐涂料。通过核磁共振氢谱和 FT-IR证实光敏磷酸酯的，成功制备。探究了光敏磷酸酯的掺杂对聚苯胺分散性的影响，以及光敏磷酸酯掺杂聚苯胺的加入对涂层光固化行为、附着力和防腐性能的影响。结果表明：随光敏磷酸酯中磷酸根含量的增加，掺杂聚苯胺在光固化涂层中的分散变佳。光敏磷酸酯掺杂 PANI（≤2. 0%，质量分数）的添加对涂层的光固化程度影响较小。掺杂聚苯胺的添加可以提高光固化涂层的附着力，且随着磷酸酯中磷酸根含量的增加，附着力从 2. 49 MPa上升至 3. 52 MPa。当掺杂剂中磷酸根含量最高时，所构筑的聚苯胺光固化涂层表现出最佳的耐腐蚀性， 3. 5%NaCl溶液中浸泡 30 d后|Z|_{0. 1 Hz}高于 10⁹ Ω·cm²，划痕盐雾 400 h后涂层仅划痕处出现腐蚀迹象。

关键词: 光敏磷酸酯, 聚苯胺, UV固化涂层, 附着力, 防腐性

Abstract: A series of photosensitive phosphate was synthesized via a ring-openingreaction of protic acids（pivalic acid，lactic acid and 2，2-dimethylolpropionic acid） and glycidyl methacrylate（GMA）and the subsequent phosphorylation with pyrophosphoric acid.The as-prepared photosensitive phosphate was employed to dope PANI，which was used as anticorrosive fillers to prepare UV-curable anticorrosive coatings. The successful preparationof photosensitive phosphate was confirmed by 1H NMR and FT-IR. The dispersion behavior ofphotosensitive phosphate ester doped polyaniline was investigated. The results showed that thedoping of PANI by photosensitive phosphate with higher content of phosphate could enhancethe dispersion of PANI in the UV-cured coating. The influence of the incorporation of doped polyaniline on the UV-curing behavior，coating adhesion and corrosion resistance of the UV-curable coating were studied. The gel content test results showed that the addition ofphotosensitive phosphate doped PANI（≤2. 0%）had little effect on the curing degree of thecoating. The adhesion performance of the UV-cured coating was improved with the addition ofdoped PANI，which increased from 2. 49 MPa to 3. 52 MPa with the increase of the phosphatecontent in the phosphate ester. The corrosion resistance of the coating was investigated byelectrochemical impedance spectroscopy and salt spray experiments. At optimum conditions，the 30d |Z|_0.1Hz value of the UV-cured coating with doped PANI was still higher than 10⁹Ω·cm² after immersion，suggesting the significantly enhanced anti-corrosion performance with theincorporation of photosensitive phosphate PANI.

Key words: photosensitive phosphate, polyaniline, UV curing coating, adhesion, corrosion resistance

中图分类号:

TQ637. 83

张子杰, 潘威豪, 刘仁, 等. 光敏磷酸酯掺杂聚苯胺光固化涂层的制备及其耐腐蚀性探究[J]. 涂料工业, 2023, 53(7): 1-12.

ZHANG Z J, PAN W H, LIU R, et al. Preparation and Anti-corrosion Properties of Photocurable Coating with Photosensitive Phosphate-doped Polyaniline[J]. Paint & Coatings Industry, 2023, 53(7): 1-12.

https://www.cn-pci.com/CN/Y2023/V53/I7/1

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