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石墨烯/环氧树脂防腐涂料研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/10/8 8:57:52  

摘要:随着我国石油天然气工业的迅速发展,油气运输管道越来越长,但油气管道在长时间的服役过程中,由于管线的复杂与环境变化,管道的腐蚀程度会不断加深。涂装防腐层是管道防腐最基本的、必须采取的措施。环氧树脂作为底漆中常用的热固性树脂基体,因具有不同的分子结构,可以表现出不同的性能。且由于易与不同的固化剂、稀释剂、助剂等混合使用,制备出在机械、力学、热学、粘结性、绝缘和防腐性能上优异的环氧树脂材料,而被广泛应用于防腐涂料。但随着应用环境变得越加复杂,单纯的环氧涂料已满足不了实际需求。石墨烯因其独特的晶体结构、优异的物理性能及其衍生物可引发聚合反应等特点,引入柔性链段,在改善树脂基材料性能方面具有巨大的潜力。

本文以石墨烯/环氧树脂复合涂料为研究对象,首先通过对环氧树脂E20、E44、E51进行基础性能测试及电化学测试,优选出性能优异的树脂基体,然后再通过对固化剂T31、间苯二胺、DDS进行基础性能测试、涂层耐候性测试以及环氧固化收缩率的计算分析,优选出合适的固化体系,之后利用优选的各成分制备涂料,并通过性能测试结果进行正交试验分析,确定基础涂料的最佳配比。最后以石墨烯为填料加入到基础涂料当中,并研究了石墨烯的不同添加方式与添加量对涂层在基础性能、耐候性以及防腐性能方面的影响。得到如下结论:

(1)在E20、E44、E51三种环氧树脂中,E44的基础性能优于E20、E51,E51的防腐性能优于E20、E44。在T31、间苯二胺、DDS三种固化剂中,T31固化体系在基础性能、耐候性能以及对环氧固化收缩率方面的影响最佳,并且基础涂料配方为:环氧E44、30%固化剂T31、30%稀释剂乙酸乙酯时,涂层的基础性能最佳。

(2)石墨烯的添加有效的增强了涂层在硬度、抗冲击、耐盐雾、耐候等方面的性能,并且提高了涂层的防腐能力。涂层的综合性能会随着石墨烯添加量的增加而提高,但当达到一定添加量时,会因石墨烯的团聚造成涂层性能下降。

(3)对于石墨烯的添加方式来说,当使用KH560偶联剂改性石墨烯与石墨烯分散剂相结合的方式时,对涂层综合性能的提升最大。当石墨烯添加量为1.5%时,综合性能最佳。此时抗冲击达到50cmkg,附着力为2级,硬度高于6H,并且耐盐雾时间高达1500h,腐蚀电流密度低至2.039×10-8A/cm2,较纯环氧涂层的各方面性能有很大提升。

With the rapid development of petroleum andnatural gas industry in our country, oil and gas pipelines are becoming longerand longer. However, in the long service process of oil and gas pipelines, dueto the complexity of pipelines and the change of environment, the corrosiondegree of pipelines will continue to deepen. It is the most basic and necessarymeasure to brush coating for pipelines. Epoxy resin is a thermosetting resinmatrix. Because it has different molecular structure, it can show differentproperties. And it is easy to mix with different curing agents, diluents andadditives, so it can be processed as excellent epoxy resin materials in theaspect of machine, mechanics, thermotics, agglutinating value, insulativity,anticorrosion. Now, it is widely used in anticorrosive coatings. However, withthe application environment becoming more and more complex, pure epoxy coatingscan not satisfy the actual needs. Because graphene has unique crystalstructure, excellent physical properties and its derivatives which can initiatepolymerization, it has great potential in improving the properties ofresin-based materials.

(1) In this paper, I take graphene/epoxycomposite coatings as the research object. Firstly, the epoxy resins E20, E44and E51 were tested for their basic properties and electrochemical properties,and the resin matrix with excellent properties was selected. Among the threecuring agents T31, m-phenylenediamine and DDS, T31 curing system has the besteffect on the basic properties, weatherability and shrinkage of epoxy curing.And when the basic coating formulation is: epoxy E44, 30% curing agent T31, 30%diluent ethyl acetate, the basic performance of the coating is the best.

(2) It effectively enhances the hardness,impact resistance, salt spray resistance and weather resistance of the coating,and improves the corrosion resistance of the coating when the graphene added toepoxy coatings. The comprehensive properties of the coatings will be improvedwith the increase of graphene content, but when a certain amount of graphene isadded, the properties of the coatings will be reduced due to the agglomerationof graphene.

(3) For the addition mode of graphene, whenmodified graphene which use KH560 coupling agent combined with graphenedispersant, the comprehensive performance of the coating is improved the most.When the graphene content is 1.5 %, the comprehensive performance is the best.At this time, the impact resistance reaches 50 cm•kg, the adhesion is grade 2,the hardness is higher than 6H, and the salt spray resistance time is as highas 1500 h. The corrosion current density is as low as 2.039 × 10-8 A/cm2, whichgreatly improves the properties of pure epoxy coatings.

关键词:石墨烯;环氧涂料;分散剂;偶联剂改性;防腐性能

graphene;epoxycoatings;dispersants;couplingagent modification;antiseptic propertie

上一篇:ZIF-90/GO复合吸附剂的制备及其对正己烷的吸附性能研究     下一篇:石墨烯复合材料的性能研究及其在石油化工污染物处理上的应用
 
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