PUF/PANI-CO双壁微胶囊的制备及改性水性环氧涂层的防腐性能  

Preparation of PUF/PANI-CO double-walled microcapsules and anticorrosion performance of modified waterborne epoxy coating

作　　者：穆建立 李丽娟 姚红蕊 王娜[1,2,3] MU Jianli;LI Lijuan;YAO Hongrui;WANG Na(Liaoning Provincial key Laboratory for Synthesis and Preparation of Special Functional Materials,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China;Shenyang Key Laboratory for New Functional Coating Materials,Shenyang 110142,Liaoning,China;China-Spain Joint Laboratory on Material Science,Shenyang 110142,Liaoning,China)

机构地区：[1]沈阳化工大学辽宁省特种功能材料合成与制备重点实验室,辽宁沈阳110142 [2]沈阳市新型功能涂层材料重点实验室,辽宁沈阳110142 [3]中国-西班牙材料联合实验室,辽宁沈阳110142

出　　处：《精细化工》2024年第10期2171-2179,共9页Fine Chemicals

基　　金：2021年辽宁省“揭榜挂帅”科技攻关项目(2021JH1/10400091);中国-西班牙材料联合实验室项目(2022JH2/10700005);辽宁省教育厅2021年度科学研究经费项目-面上项目(LJKZ0451);辽宁省科技厅应用基础研究计划项目——环境友好型生物基聚氨酯涂料(2023JH2/101300229)。

摘　　要：以蓖麻油(CO)为芯材、脲醛树脂(PUF)和聚苯胺(PANI)为壁材,采用原位聚合法和物理沉积法制备了双壁微胶囊PUF/PANI-CO,将其添加到水性环氧涂层(WEC)中制备了复合涂层PUF/PANI-CO/WEC。通过FTIR、XRD和SEM对PUF/PANI-CO进行了表征,采用电化学阻抗谱(EIS)和盐雾实验考察了PUF/PANI-CO/WEC的防腐性能。结果表明,PUF/PANI-CO是以CO为芯材,PANI相互交叉沉积在内壁PUF外而形成的致密外壁的双壁微胶囊,粒径3~4μm;PUF/PANI-CO/WEC在质量分数为3.5%的NaCl水溶液中浸泡30 d后,涂层的低频阻抗为7.600×10^(8)Ω·cm^(2);PUF/PANI-CO/WEC与金属基体之间的附着力为15.64 MPa。PUF/PANI-CO/WEC的防腐性能源于三方面:PANI/PUF-CO较好的分散性和稳定性能够有效提高水性环氧涂层的阻隔性;壁材破裂时释放的芯材能够填补涂层中的缺陷,从而阻断腐蚀介质的传输路径;PANI不仅可以提高微胶囊的稳定性,而且能够促进金属基体表面钝化膜的形成,延缓腐蚀介质的渗入,进而对基体起到良好的保护作用。PUF/PANI-CO double-walled microcapsules were prepared by in-situ polymerization and physical deposition using castor oil(CO)as core material,urea-formaldehyde resin(PUF)and polyaniline(PANI)as wall materials,characterized by FTIR,XRD and SEM,and then added to waterborne epoxy coating(WEC)for the synthesis of PUF/PANI-CO/WEC composite coating.The corrosion behavior of PUF/PANI-CO/WEC composite coating was analyzed by electrochemical impedance spectroscopy(EIS)and salt spray test.The results showed that PUF/PANI-CO were a double-walled microcapsule with a dense outer wall formed by cross-deposition of PANI on the inner wall of PUF with CO as core material,with a particle size of 3~4μm.After soaking PUF/PANI-CO/WEC in 3.5%(mass fraction)NaCl solution for 30 d,the low-frequency impedance of the coating was 7.600×10^(8)Ω·cm^(2),while the adhesion between PUF/PANI-CO/WEC and metal matrix was 15.64 MPa.The corrosion resistance of PUF/PANI-CO/WEC was attributed to three aspects:PANI/PUF-CO had good dispersion and stability,which could effectively improve the barrier property of water-borne epoxy coating;The core material released when the wall material breaks could fill the defects in the coating,thus blocking the transmission path of the corrosive medium.PANI could improve the stability of microcapsules and promote the formation of passivation film on the surface of metal matrix,delay the infiltration of corrosive media,and thus play a good role in protecting the matrix.

关 键 词：金属腐蚀 水性环氧树脂 聚苯胺 微胶囊 电化学阻抗谱 功能材料 

分 类 号：TG174.4[金属学及工艺—金属表面处理] U177.2[金属学及工艺—金属学]