石墨烯对聚氨酯/Al复合涂层耐盐水性能的影响
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摘要
目的提高聚氨酯(PU)/Al复合涂层的耐盐水性能。方法以石墨烯为改性剂、PU为粘合剂、Al粉为颜料,采用刮涂法制备石墨烯改性PU/Al复合涂层,分析探讨改性前后涂层经盐水腐蚀不同时间后,微结构、红外发射率、光泽度及力学性能的变化规律及成因。结果石墨烯改性涂层的发射率对盐水腐蚀的稳定性改善明显,经盐水腐蚀21 d后,发射率仅从腐蚀前的0.335上升为腐蚀后的0.355。经长时间盐水腐蚀后,改性后涂层比改性前涂层具有更低的发射率。在不同的盐水腐蚀时间内,改性后涂层比改性前涂层均具有更低的光泽度,且稳定性较高,经盐水腐蚀21d后,改性后涂层的光泽度仍然可保持在16.1,这有利于实现涂层的低发射率与低光泽兼容。改性前后涂层的硬度、附着力对盐水腐蚀均具有较高的稳定性,说明石墨烯改性对改善涂层耐冲击强度及盐水腐蚀的稳定性作用有限,后续仍需进一步研究改进。结论石墨烯改性可明显提高PU/Al复合涂层的红外发射率及光泽度对盐水腐蚀的稳定性。
The work aims to improve the salt water resistance of polyurethane(PU)/Al composite coating. Graphene modified PU/Al composite coating was prepared by scratch coating method with graphene, PU and Al powders as modification agent, adhesives and pigments, respectively. The variation and causes of microstructure, infrared emissivity, glossiness and mechanical properties of the coating before and after modification by salt water corrosion for different times were discussed. The emissivity stability to salt water corrosion of the graphene modified coating was significantly improved. After salt water corrosion for 21 days, the emissivity was only increased from 0.335 before corrosion to 0.355 after corrosion. After a long period of salt water corrosion, the modified coating had a lower emissivity than the unmodified coating. The modified coating had lower glossiness than the unmodified coating for different salt water corrosion times, and had high stability. After salt water corrosion for 21 days, the glossiness of the modified coating could still be kept at a lower value of 16.1, which was beneficial to achieve compatibility of low emissivity and low glossiness of the coating. The hardness and adhesion strength of the coatings before and after modification had high stability to salt water corrosion. Graphene modification had limited effect on improving the stability of impact strength of the coating to salt water corrosion, and further research and improvement were needed. Graphene modification can significantly improve the stability of infrared emissivity and glossiness to the salt water corrosion of PU/Al composite coating.
The work aims to improve the salt water resistance of polyurethane(PU)/Al composite coating. Graphene modified PU/Al composite coating was prepared by scratch coating method with graphene, PU and Al powders as modification agent, adhesives and pigments, respectively. The variation and causes of microstructure, infrared emissivity, glossiness and mechanical properties of the coating before and after modification by salt water corrosion for different times were discussed. The emissivity stability to salt water corrosion of the graphene modified coating was significantly improved. After salt water corrosion for 21 days, the emissivity was only increased from 0.335 before corrosion to 0.355 after corrosion. After a long period of salt water corrosion, the modified coating had a lower emissivity than the unmodified coating. The modified coating had lower glossiness than the unmodified coating for different salt water corrosion times, and had high stability. After salt water corrosion for 21 days, the glossiness of the modified coating could still be kept at a lower value of 16.1, which was beneficial to achieve compatibility of low emissivity and low glossiness of the coating. The hardness and adhesion strength of the coatings before and after modification had high stability to salt water corrosion. Graphene modification had limited effect on improving the stability of impact strength of the coating to salt water corrosion, and further research and improvement were needed. Graphene modification can significantly improve the stability of infrared emissivity and glossiness to the salt water corrosion of PU/Al composite coating.
引文
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[2]SOLOVYEV A A,RABOTKIN S V,KOVSHAROV N F.Polymer films with multilayer low-E coatings[J].Materials science in semiconductor processing,2015,38:373-380.
[3]CHEN J,ZHOU Y M,NAN Q L,et al.Synthesis,characterization and infrared emissivity study of Polyurethne/TiO2 nanocomposites[J].Applied surface science,2007,253(23):9154-9158.
[4]MAO Z P,YU X L,ZHANG L P,et al.Novel infrared stealth property of cotton fabrics coated with nano ZnO:(Al,La)particles[J].Vacuum,2014,104:111-115.
[5]LIU Z H,BAN G D,YE S T,et al.Infrared emissivity properties of infrared stealth coatings prepared by water-based technologies[J].Optical materials express,2016,6:275710.
[6]张伟钢,徐国跃,薛连海.低红外发射率材料研究进展[J].红外技术,2015,37(5):361-366.ZHANG Wei-gang,XU Guo-yue,XUE Lian-hai.Research progress of low infrared emissivity materials[J].Infrared technology,2015,37(5):361-366.
[7]YAN X X,XU G Y.Corrosion an mechanical properties of polyurethane/Al composite coatings[J].Journal of alloys and compounds,2010,491:649-653.
[8]GAO W,ALEMANY L B,CI L,et al.New insights into the structure and reduction of graphite oxide[J].Nature chemistry,2009,1(5):403-408.
[9]CHAE H K,SIBERIO-PEREZ D Y,KIM J,et al.A route to high surface area,porosity and inclusion of large molecules in crystals[J].Nature,2004,427(6974):523-527.
[10]GEIM A K.Graphene:Status and prospects[J].Science,2009,324(5934):1530-1534.
[11]SUN W,ZHAO L,WU T,et al.Inhibiting the corrosion-promotion activity of graphene[J].Chemistry of materials,2015,27(7):2367-2373.
[12]MO M,ZHAO W,CHEN Z,et al.Corrosion inhibition of functional graphere reinforced polyurethane nanocomposite coatings with regular textures[J].RSC advances,2015,6(10):7780-7790.
[13]张伟钢,曾银伍.石墨烯对聚氨酯/Al复合涂层光泽度及红外发射率性能的影响[J].表面技术,2017,46(12):175-178.ZHANG Wei-gang,ZENG Yin-wu.Effects of graphene on glossiness and infrared emissivity of polyurethane/Al composite coating[J].Surface technology,2017,46(12):175-178.
[14]YU H J,XU G Y,SHEN X M,et al.Low infrared emissivity of polyurethane/Cu composite coatings[J].Applied surface science,2009,255:6077-6081.
[15]ZHANG W G,XU G Y,DING R Y,et al.Nacre biomimetic design:A possible approach to prepare low infrared emissivity composite coatings[J].Materials science and engineering:C,2013,33:99-102.
[16]杨光,邓安仲,陈静波.KH560改性纳米硅溶胶对苯丙涂层性能的影响[J].表面技术,2017,46(8):49-54.YANG Guang,EENG An-zhong,CHEN Jing-bo.Effects of nano silica sol modified by KH650 on properties of styrene acrylic coating[J].Surface technology,2017,46(8):49-54.
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