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石墨烯光固化管道防腐涂料的制备及性能研究

作者:完美论文网  来源:www.wmlunwen.com  发布时间:2019/10/8 9:11:59  

摘要:随着石油天然气工业迅速发展,油气运输管道安全不仅影响着我国工业发展,更关乎国民的生命财产安全。涂覆防腐涂料是控制管道腐蚀发生最直接、最经济的方式,因此防腐涂料一直是国内外专家学者研究和关注的重点。石墨烯具有比表面积大、电绝缘性、优异的机械强度以及阻隔性能,加入涂料中可大大改善其力学、热学、电学、防腐等综合性能。与传统溶剂型防腐涂料相比,将紫外(UV)光固化技术引入防腐涂料,制备光固化防腐涂料具有能耗低、零VOC排放、防腐效果好、室温下固化速度快等优点,在金属防腐领域具有极大的应用前景。

本文主要针对光固化涂料进行组分优选、配方优化,研究清漆中石墨烯的不同添加量以及氧化石墨烯的不同改性剂对光固化防腐涂料机械以及防腐性能的影响,并对石墨烯以及氧化石墨烯在涂层中的防腐机理进行深入探讨。得出以下结论:

(1)根据光固化涂料体系中各组分性质,对试验材料进行优选,确定最佳组分:低聚物为环氧丙烯酸树脂(EA)和聚酯丙烯酸树脂(PEA);活性稀释剂为己二醇二丙烯酸酯(HDDA)、二缩三丙二醇二丙烯酯(TPGDA)、三羟甲基丙烷三丙烯酸酯(TMPTA);光引发剂为1-羟基环己基苯基甲酮(184)、2, 4, 6–三甲基苯甲酰氧化二苯基膦(TPO),各组分均采用复配形式。光固化涂料的最佳比例为:25 wt.% EA、43 wt.% PEA、13.2 wt.% HDDA、8.8 wt.% TPGDA、7 wt.% TMPTA、1.8 wt.% 184以及1.2 wt.% TPO。

(2)通过涂层物理性能测试,结果表明:涂层的固化时间、硬度与耐冲击性受涂层厚度的影响较大。随着涂层厚度的增加,涂层的耐冲击性能变化明显,呈先升高后下降的趋势。当涂层厚度为100μm时,涂层各方面物理性能表现最优。

(3)涂层的固化时间和硬度随着石墨烯添加量的增加而增大,耐冲击性以及附着力等级随着石墨烯添加量的增加呈先增后减的趋势。当石墨烯的添加量为0.1wt.% 时,涂层的固化时间、硬度、耐冲击性以及附着力等级等物理性能可达到最佳。防腐性能测试结果表明,当石墨烯的添加量为0.1wt.% 时,防腐性能最优。

(4)涂层的固化时间随着改性或未改性氧化石墨烯的加入而延长,硬度、耐冲击性以及附着力等级都得到了一定程度的提升。其中,两种硅烷改性氧化石墨烯涂层的硬度和耐冲击性均未如未改性氧化石墨烯涂层提升幅度大,但附着力表现改性氧化石墨烯涂层明显优于未改性氧化石墨烯涂层。防腐性能测试结果表明,与纯涂层相比,添加改性或未改性氧化石墨烯后,涂层的防腐性能提升明显。其中3-氨丙基三乙氧基硅烷改性后氧化石墨烯(A-GO)涂层防腐性能最好。

With the rapid development of petroleum andnatural gas industry, the safety of oil and gas pipelines not only affects theindustrial development of country, but also concerns the safety of people'slives and property. Anticorrosive coatings is the most direct and economicalway to control pipeline corrosion. Therefore, anticorrosive coatings have beenthe focus of attention of experts and scholars at home and abroad. Graphene haslarge specific surface area, electrical insulation, excellent mechanicalstrength and barrier properties. The mechanical, thermal, electrical andanti-corrosion properties of coatings can be greatly improved by adding thenano-fillers. Compared with traditional solvent-based anticorrosive coatings,UV-curable anticorrosive coatings has the advantages of low energy consumption,low emissions of VOC (organic solvents), good anticorrosive effect and fastcuring speed at room temperature, and have great application prospects in thefield of metal anticorrosive coatings.

In this paper, the component optimizationand formulation optimization of UV-curable coatings were carried out. Theeffects of different addition of graphene and modifiers of graphene oxide onthe mechanical and anti- corrosive properties of UV-curable anticorrosivecoatings were studied. The anticorrosive mechanism of graphene and grapheneoxide in coatings was discussed in depth. The following conclusions are drawn:

(1) According to the properties of eachcomponent in the UV-curable coatings system, the optimum components wereselected: oligomer: epoxy acrylic resin (EA) and polyester acrylic resin (PEA);active diluent (monomer): hexanediol diacrylate (HDDA), tripropylene glycoldiacrylate (TPGDA), tri-hydroxymethyl propane tri- acrylate (TMPTA);photoinitiator: 1-hydroxy.  Cyclohexylphenylketone (184), 2, 4, 6 - trimethylbenzoyl diphenylphosphine oxide (TPO).all components are in the form of compound. The optimum proportion of UV-curablecoatings is 25 wt.% EA, 43 wt.% PEA, 13.2 wt.% HDDA, 8.8 wt.% TPGDA, 7 wt.%TMPTA, 1.8 wt.% 184 and 1.2 wt.% TPO.

(2) The mechanical properties of thecoatings were tested. The results showed that the curing time, hardness andimpact resistance of the coatings were greatly affected by the thickness of thecoatings. With the increase of coating thickness, the impact resistance of thecoating changes obviously. The property increased first and decreasedafterwards. When the thickness of the coating was 100 micron, the mechanicalproperties of the coating were the best.

(3) The curing time and hardness of thecoating increase with the increase of graphene content, and with the increaseof graphene content, the impact resistance and adhesion grade increased firstand decreased afterwards. When the mass fraction of graphene was 0.1wt.%, thephysical properties of the coatings, such as curing time, hardness, impactresistance and adhesion, can be greatly improved. The results of anti-corrosiontest showed that when the mass fraction of graphene was 0.1wt.%, the anti-corrosion performance of coatings was the best.

(4) The curing time of the coating wasprolonged with the addition of modified or unmodified graphene oxide, and thehardness, impact resistance and adhesion grade of the coating were improved toa certain extent. In addition, the hardness and impact resistance of the twosilane modified graphene oxide coatings were not as much as that of theunmodified graphene oxide coatings, but the adhesion performance of themodified graphene oxide coatings was better than that of the unmodifiedgraphene oxide coatings. The corrosion resistance test results showed thatcompared with pure coatings, the corrosion resistance of the coatings wasimproved obviously by adding modified or unmodified graphene oxide. Moreover,graphene oxide modified by 3-aminopropyl triethoxysilane(A-GO) nano- compositecoatings had the best anticorrosion performance.

关键词:UV固化;石墨烯;防腐涂料;表面改性

UV-curable; graphene; anti-corrosivecoatings; functionalizetion

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