疏水改性氧化石墨烯/环氧复合涂料的制备及其防腐性能研究  

Preparation and Anticorrosion Property of Hydrophobic Modified Graphene Oxide/Epoxy Composites

作　　者：卞政[1] 梅俊龙 王瑾[1] 方永勤[1] Bian Zheng;Mei Junlong;Wang Jin;Fang Yongqin(Institute of Design and Research,Changzhou University,Changzhou,Jiangsu 213164,China)

机构地区：[1]常州大学设计研究院,江苏常州213164

出　　处：《涂料工业》2018年第9期6-13,共8页Paint & Coatings Industry

基　　金：江苏省产学研前瞻性联合研究项目(BY2015027-27);常州市科技支撑计划(工业)(CE20160070)

摘　　要：以叔碳酸缩水甘油酯(E-10P)为疏水单体,通过环氧与羧酸的共价键合,在氧化石墨烯(GO)表面引入疏水性支化碳链,改性后的氧化石墨烯(F-GO)作为防锈填料加入环氧树脂中得到FGO/环氧复合涂料。通过红外光谱、拉曼光谱、X-射线衍射、热重分析对F-GO的结构进行表征,通过场发射扫描电镜观察F-GO及复合涂料的微观形貌,并通过电化学阻抗、极化曲线和盐雾试验测试了复合涂料的防腐性能。结果表明:E-10P可利用其空间效应阻碍片层的团聚;疏水效应可提高F-GO的热稳定性和与环氧树脂的相容性;与空白环氧涂层相比,当复合涂料中F-GO质量分数为0.2%时,厚度为20~25μm的防腐涂层的腐蚀电流可由2.358 6×10^(-6)A/cm^2下降至2.000 2×10^(-11)A/cm^2,阻抗值可由1.1×107Ω·cm^2提升至6.9×10~9Ω·cm^2。A highly branched hydrophobic carbon chain is introduced on the surface of gra- phene oxide （GO） by the covalent bonding of epoxy and carboxylic acid, wherein, glycidyl es- ter （CarduraTM E-10P） is used as a hydrophobic monomer. The modified graphene oxide（ F- GO ） is added as an anti-rust filler to epoxy resin to obtain the F-GO/epoxy composite materi- al. Structural properties are characterized by Fourier transform infrared spectrometer （FT- IR）, Raman spectroscopy, X-ray diffraction （XRD） and Thermal gravimetric （TG）. In addi- tion, morphological properties are observed with Field-emission scanning electron microscopy （FE-SEM）. The corrosion behaviors of the coated steel substrates are evaluated by Neutral salt spray （NSS） and Electrochemical measurements. The results show that E-10P can inhibit the agglomeration of lamellae by its steric effect. The hydrophobic effect enhances the thermal stability of F-GO and compatibility of epoxy resin. When the additive amount of the composite is 0. 2%, the corrosion current of anti-corrosive coating with a thickness of 20-25 μm can be reduced from 2. 358 6×10^-6 A/cm2 to 2. 000 2×10^-11 A/cm^2 and the impedance value can be increased from 1. 1×10^7Ω·cm^2 to 6. 9×10^9Ω·cm^2.

关 键 词：复合涂层 环氧 氧化石墨烯 疏水 防腐 

分 类 号：TQ630.4[化学工程—精细化工]