石墨烯对聚氨酯/Al-Sm_2O_3复合涂层耐盐水性能的影响
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摘要
以Al粉和Sm_2O_3为功能颜料、聚氨酯(PU)为黏合剂、石墨烯为改性剂,采用刮涂法制备得到了石墨烯改性PU/Al-Sm_2O_3复合涂层。采用扫描电镜、红外发射率测试仪、近红外光谱、涂层力学性能标准测试法,系统研究了石墨烯改性前后涂层经盐水腐蚀不同时间后的微结构、功能特性及力学性能的变化规律,并对其成因进行了分析探讨。结果表明,石墨烯改性涂层经盐水腐蚀不同时间后的外观及表面微结构基本保持完好,体现出了良好的稳定性。经石墨烯改性后涂层相比改性前涂层,其发射率及1.06μm反射率对盐水腐蚀的稳定性明显改善,经盐水腐蚀21 d后发射率仅从腐蚀前的0.623上升为腐蚀后的0.638,1.06μm反射率从腐蚀前的40.8%降低为31.9%。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和1.06μm反射率。同时,改性后涂层相比改性前涂层可保持更加稳定和优良的力学性能,能更好地满足实际工程应用要求。
Graphene modified polyurethane(PU)/Al-Sm_2O_3 composite coating was prepared by scratch coating method using Al powders, Sm_2O_3, PU and graphene as functional pigments, adhesives and modification agent, respectively. The microstructure, functional properties and mechanical properties of modified and unmodified coatings after salt water corrosion for different time were systematically studied by using scanning electron microscopy, infrared emissivity tester, near-infrared spectroscopy and standard test methods for mechanical properties of coatings, and the causes were analyzed and discussed. The results show that the appearance and surface microstructure of the graphene modified coating after salt water corrosion for different time were basically intact, which showing good stability. Compared with the unmodified coating, the stability of the emissivity and reflectivity at 1.06 μm of the modified coating was significantly improved for the salt water corrosion. After salt water corrosion for 21 d, the emissivity only increased from 0.623 before corrosion to 0.638 after corrosion and the reflectivity at 1.06 μm decreased from 40.8% before corrosion to 31.9% after corrosion. After a long period of salt water corrosion, the modified coating had a lower emissivity and a lower reflectivity at 1.06 μm than the unmodified coating. At the same time, the modified coating could maintain more stable and excellent mechanical properties than the unmodified coating, which could better meet the requirements of practical engineering applications.
Graphene modified polyurethane(PU)/Al-Sm_2O_3 composite coating was prepared by scratch coating method using Al powders, Sm_2O_3, PU and graphene as functional pigments, adhesives and modification agent, respectively. The microstructure, functional properties and mechanical properties of modified and unmodified coatings after salt water corrosion for different time were systematically studied by using scanning electron microscopy, infrared emissivity tester, near-infrared spectroscopy and standard test methods for mechanical properties of coatings, and the causes were analyzed and discussed. The results show that the appearance and surface microstructure of the graphene modified coating after salt water corrosion for different time were basically intact, which showing good stability. Compared with the unmodified coating, the stability of the emissivity and reflectivity at 1.06 μm of the modified coating was significantly improved for the salt water corrosion. After salt water corrosion for 21 d, the emissivity only increased from 0.623 before corrosion to 0.638 after corrosion and the reflectivity at 1.06 μm decreased from 40.8% before corrosion to 31.9% after corrosion. After a long period of salt water corrosion, the modified coating had a lower emissivity and a lower reflectivity at 1.06 μm than the unmodified coating. At the same time, the modified coating could maintain more stable and excellent mechanical properties than the unmodified coating, which could better meet the requirements of practical engineering applications.
引文
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[9] Zhang Weigang, Wang Siyi. Effect of graphene on functional characteristics and heat resistant properties of polyurethane/Al-Sm2O3 composite coating[J]. Materials Protection, 2018, 51(5): 34-38(in Chinese).张伟钢, 王思懿. 石墨烯对聚氨酯/Al-Sm2O3复合涂层功能特性及耐温性能的影响[J]. 材料保护, 2018, 51(5): 34-38.
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[13] 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.
[14] Wang Y J, Xu G Y, Yu H J, et al. Comparison of anti-corrosion properties of polyurethane based composite coatings with low infrared emissivity[J]. Applied Surface Science, 2011, 257: 4743-4748.
[15] Zhang Weigang, Wu Jiajia. Near-infrared absorption and heat resistance of graphene modified polyurethane/Sm2O3 composite coating[J]. Surface Technology, 2018, 47(1): 39-44(in Chinese).张伟钢, 吴佳佳. 石墨烯改性聚氨酯/Sm2O3复合涂层的近红外吸收与耐温性能[J]. 表面技术, 2018, 47(1): 39-44.
[2] Cheng Hongfei, Huang Daqing. Research progress in multi-spectrum compatible stealth materials[J]. Journal of Aeronautical Materials, 2014, 34(5): 93-99(in Chinese).程红飞, 黄大庆. 多频谱兼容隐身材料研究进展[J]. 航空材料学报, 2014, 34(5): 93-99.
[3] Chen Jiao, Huang Xiaogu, Wang Lixi, et al. Preparation and properties of multiple-band stealth functional filer[J]. Journal of Functional Materials, 2010, 41(10): 1842-1844(in Chinese).陈娇, 黄啸谷, 王丽熙, 等. 多波段兼容隐身功能填料的制备及其性能研究[J]. 功能材料, 2010, 41(10): 1842-1844.
[4] Zhang Weigang, Xu Guoyue, Xue Lianhai. Research progress of low infrared emissivity materials[J]. Infrared Technology, 2015, 37(5): 361-367(in Chinese).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): 361-367.
[5] Zhao X K, Zhao Q W, Wang L F. Laser and infrared compatible stealth from near to far infrared bands by doped photonic crystal [J]. Proc Eng, 2011, 15: 1668-1672.
[6] Yuan Le, Weng Xiaolong, Lu Hu, et al. Preparation and infrared reflection performance of Al/Cr2O3 composite particles [J]. Journal of Inorganic Materials, 2013, 28(5): 545-550(in Chinese).袁乐, 翁小龙, 卢虎, 等. Al/Cr2O3复合粉体的制备及红外反射特性研究 [J]. 无机材料学报, 2013, 28(5): 545-550.
[7] Xing Honglong, Guo Wenmei, Tao Qiyu, et al. Preparation and properties pf infrared-laser compatible stealth coating with waterborne polyurethane [J]. Laser and Infrared, 2013, 43(7): 761-765(in Chinese).邢宏龙, 郭文美, 陶启宇, 等. 聚氨酯基红外-激光兼容隐身涂层性能研究 [J]. 激光与红外, 2013, 43(7): 761-765.
[8] Zhang Weigang, Xu Guoyue, Qiao Jialiang, et al. Low emissivity at 8-14 μm and low near-infrared reflective properties of Al-Sm2O3/polyurethane composite coatings[J]. Acta Materiae Compositae Sinica, 2014, 31(2): 436-440(in Chinese).张伟钢, 徐国跃, 乔加亮, 等. Al-Sm2O3/聚氨酯复合涂层的近红外低反射与8～14 μm低发射率性能[J]. 复合材料学报, 2014, 31(2): 436-440.
[9] Zhang Weigang, Wang Siyi. Effect of graphene on functional characteristics and heat resistant properties of polyurethane/Al-Sm2O3 composite coating[J]. Materials Protection, 2018, 51(5): 34-38(in Chinese).张伟钢, 王思懿. 石墨烯对聚氨酯/Al-Sm2O3复合涂层功能特性及耐温性能的影响[J]. 材料保护, 2018, 51(5): 34-38.
[10] Yan X X, Xu G Y. Corrosion and mechanical properties of polyurethane/Al composite coatings[J]. Journal of Alloys and Compounds, 2010, 491: 649-653.
[11] Zhang E Z, Wang T, Zhao L, et al. Fast selfhealing of graphene oxide-hectorite clay-poly (N, N-dimethylacrylamide) hybrid hydrogels realized by near-infrared irradiation[J]. ACS Applied Materials & Interfaces, 2014, 6(24): 22855-22861.
[12] Sun W, Zhao L, Wu T, et al. Inhibiting the corrosion-promotion activity of graphene[J]. Chemistry of Materials, 2015, 27(7): 2367-2373.
[13] 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.
[14] Wang Y J, Xu G Y, Yu H J, et al. Comparison of anti-corrosion properties of polyurethane based composite coatings with low infrared emissivity[J]. Applied Surface Science, 2011, 257: 4743-4748.
[15] Zhang Weigang, Wu Jiajia. Near-infrared absorption and heat resistance of graphene modified polyurethane/Sm2O3 composite coating[J]. Surface Technology, 2018, 47(1): 39-44(in Chinese).张伟钢, 吴佳佳. 石墨烯改性聚氨酯/Sm2O3复合涂层的近红外吸收与耐温性能[J]. 表面技术, 2018, 47(1): 39-44.