摘要
为了提高车用冷轧钢表面耐腐蚀能力,采用在光固化树脂聚氨酯丙烯酸酯(PUA)基体中加入十二烷基苯磺酸钠(SDBS)掺杂聚苯胺(PAN)的方法制得一种可以实现低VOC排放量的防腐蚀涂层。通过红外光谱和紫外分光光度计测试选择了PUA合适的光引发剂,通过电化学试验研究了涂层电化学阻抗性能。结果表明:光引发剂369可以使聚氨酯丙烯酸酯获得最高的转化率与固化效率;通过添加四氢呋喃(THF)的方法来提高SDBSPAN分散性,PUA中形成了均匀分散性的SDBS-PAN颗粒。添加SDBS-PAN之后,涂层获得了更优的耐蚀性。随着SDBS-PAN添加量从0.1%继续升高到0.8%后,试样的低频阻抗发生了先升高后降低的现象。单一掺杂量涂层的低频阻抗随着时间延长而下降,添加量为0.5%的聚苯胺涂层的低频阻抗比纯PUA涂层进一步升高。当浸泡时间增加后,涂层电容也逐渐增大,但添加0.5%SDBS-PAN后可以使涂层获得更优的防护性能。
In order to improve the corrosion resistance of cold rolled steel surface,an anticorrosive coating with low VOC emission was prepared by adding sodium dodecylbenzenesul(SDBS)doped polyaniline(PAN)to PUA matrix.The infrared spectroscopy,ultraviolet spectrophotometer and electrochemical impedance(EIS)were used to study the performance.Results showed that the photoinitiator 369 could achieve the highest conversion and curing efficiency of polyurethane acrylates(PUA).The dispersibility of SDBS-PAN was improved by adding THF.With the addition of SDBS-PAN,the coating achieved better corrosion resistance.As the addition of SDBS-PAN continued to increase,the low frequency impedance of the sample decreased.The low-frequency impedance of the single-doped coating decreased with time,and the low-frequency impedance of the polyaniline coating with the addition of 0.5%increased further than that of the PUA coating.With the increase of time,the coating capacitance also gradually increased,and the addition of 0.5%SDBS-PAN could make the coating obtain better protection performance.
作者
沈现青
SHEN Xian-qing(College of Traffic Engineering and Rail Transit,Hefei Polytechnic,Hefei 238000,China)
出处
《材料保护》
CAS
CSCD
北大核心
2019年第7期85-89,共5页
Materials Protection
基金
安徽省级重点高校科研项目(KJ2018A0824)资助
关键词
聚苯胺
防腐蚀
UV光固化
涂层
性能表征
polyaniline
corrosion resistance
UV curing
coating
property characterization
