表面修饰氮化硼及其在环氧涂层中的应用研究

发布时间：2018-05-24 06:13

本文选题：h-BN-KH560 + h-BN-HBP　；参考：《西南石油大学》2017年硕士论文

【摘要】：利用无机纳米材料与聚合物制备无机-聚合物复合材料是近年来复合材料研究的热点之一。BN因其优异的物理化学性能如耐化学腐蚀、抗高温性等应用于聚合物复合材料领域,制备高性能的BN-聚合物复合材料。复合材料的性能与BN的分散性以及与聚合物之间的界面相容性密切相关。未经处理的BN因其表面惰性,在聚合物中的不均匀分散且与聚合物的相互作用力弱,限制了其性能的发挥。因此BN的表面改性成为其呈现优越性能的关键。本文对BN的表面进行改性,制备性能优异的BN/EP复合材料及其复合涂层,研究BN的不同表面化学改性对环氧涂层的抗腐蚀性能的影响。因此,本文对BN表面进行修饰,将改性后的材料添加到环氧树脂基体中制备复合涂层,并对复合涂层的抗腐蚀性能进行研究,将从以下三个方面着手:(1)在h-BN的表面通过多巴胺的作用引入小分子环氧基团,制备出h-BN-KH560,研究了表面接枝对环氧复合涂层的抗腐蚀性能的影响。结果表明,表面接枝KH560能改善h-BN与环氧树脂之间的相容性,增强与环氧树脂之间的相互作用,改善h-BN在环氧树脂中的分散性,从而提高环氧复合涂层的抗腐蚀性能;(2)在h-BN表面接枝超支化聚合物-聚芳酰胺,制备出h-BN-HBP,成功制备环氧复合涂层,并对其进行抗腐蚀性能的测试,研究结果表明超支化改性h-BN能增强h-BN与环氧树脂之间的相互作用,增强h-BN在环氧树脂的分散性及相容性,进而提高BN/环氧复合涂层的抗腐蚀性能;(3)利用h-BN的层状结构以此作为支撑模板,将Fe3O4粒子通过多巴胺的桥联作用固定在h-BN表面上,制备h-BN-Fe3O4复合材料,结果表明h-BN作为支撑模板有效减少了 Fe3O4的团聚,二者对提高环氧涂层的抗腐蚀性能起到协同作用。因此,本论文将上诉三种材料以一定比列分别添加到环氧树脂中,通过喷涂、固化等过程制备复合涂层。利用SEM观察涂层断面得到h-BN-KH560、h-BN-HBP、h-BN-Fe3O4在环氧树脂中的分散情况,结果表明三种BN复合材料比h-BN单独使用在环氧树脂的分散性及相容性均得到大幅度提高。并利用EIS、SEM观察涂层电极浸泡前后的形貌、高温高压试验及盐雾实验等手段对复合涂层的耐腐蚀性能做出测试,结果表明:添加少量的h-BN-KH560、h-BN-HBP、h-BN-Fe30就能显著增强环氧树脂涂层的抗腐蚀性能。
[Abstract]:The preparation of inorganic polymer composites using inorganic nano-materials and polymers is one of the hot topics in recent years. BN is used in polymer composites for its excellent physical and chemical properties such as chemical corrosion resistance, high temperature resistance and so on. High performance BN-polymer composites were prepared. The properties of the composites are closely related to the dispersibility of BN and the interfacial compatibility between the composites and polymers. Because of its inert surface, the untreated BN is not uniformly dispersed in the polymer and has weak interaction with the polymer, which limits the performance of BN. Therefore, the surface modification of BN is the key to its superior performance. In this paper, the surface of BN was modified and the excellent BN/EP composite and its composite coatings were prepared. The effect of different surface chemical modification of BN on the corrosion resistance of epoxy coating was studied. Therefore, the surface of BN was modified, the modified material was added to the epoxy resin matrix to prepare the composite coating, and the corrosion resistance of the composite coating was studied. The effect of grafting on the corrosion resistance of epoxy composite coating was studied by introducing small molecule epoxy group into the surface of h-BN by dopamine in order to prepare h-BN-KH 560 from the following three aspects. The results show that the surface grafted KH560 can improve the compatibility between h-BN and epoxy resin, enhance the interaction between h-BN and epoxy resin, and improve the dispersion of h-BN in epoxy resin. Therefore, the anticorrosive property of epoxy composite coating was improved by grafting hyperbranched polymer-polyaromamide on the surface of h-BN to prepare h-BN-HBP.The epoxy composite coating was successfully prepared and its corrosion resistance was tested. The results show that the hyperbranched modified h-BN can enhance the interaction between h-BN and epoxy resin, and enhance the dispersion and compatibility of h-BN in epoxy resin. Furthermore, the corrosion resistance of BN/ epoxy composite coating was improved. The layered structure of h-BN was used as the supporting template to immobilize the Fe3O4 particles on the surface of h-BN through the bridging action of dopamine to prepare h-BN-Fe3O4 composites. The results show that h-BN as a supporting template can effectively reduce the agglomeration of Fe3O4 and play a synergistic role in improving the corrosion resistance of epoxy coatings. Therefore, in this paper, three kinds of materials were added to epoxy resin to prepare composite coatings by spraying and curing. The dispersion of h-BN-KH560h-BN-HBP- h-BN-Fe3O4 in epoxy resin was observed by SEM. The results showed that the dispersion and compatibility of the three BN composites were much better than those of h-BN alone. EIS-SEM was used to observe the morphology of the coating electrode before and after immersion, and the corrosion resistance of the composite coating was tested by means of high temperature and high pressure test and salt spray test. The results show that the corrosion resistance of epoxy resin coating can be significantly enhanced by adding a small amount of h-BN-KH560h-BN-HBPnh-BN-Fe30.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332;TB306

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