共查询到18条相似文献,搜索用时 546 毫秒
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“喷涂聚脲弹性体”(SprayPolyureaElastomer)技术以其优异的综合性能和先进的施工工艺应用于京沪高速铁路桥梁混凝土防护。本文对已投入运营的京沪高速铁路聚脲防护工程聚脲防护技术的施工工艺、聚脲材料性能指标等进行了较为全面的分析;对京沪高速铁路聚脲防护技术遇到的问题进行了深刻剖析,并提出富有成效的改进措施;详细叙述了青岛理工大学功能材料研究所在制定技术文件、基材处理工艺、冬季野外施工以及涂层低温脱落等问题上,针对京沪高铁聚脲防护工程做出的大量富有指导意义的研究工作,确保了京沪高铁聚脲防护工程的顺利进行。 相似文献
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水性氟碳涂层体系对混凝土建筑的防护性能研究 总被引:2,自引:0,他引:2
通过混凝土抗碳化性能、Cl-扩散性能、渗水压力、内置钢筋电化学极化曲线和涂层膜片Cl-及水汽渗透性等性能的实验研究,系统地研究了以水性氟碳涂层作为面涂层的涂装体系对钢筋混凝土建筑防护能力,并与在混凝土表面形成单一涂膜的聚脲涂层以及通过浸渗封堵混凝土组织中的孔隙以增加表层混凝土密实度为目的而实行防护的硅烷类浸渗材料同时进行了比较。此外,研究还采用了加速气候老化试验手段考核了上述防护材料在户外大气环境中的稳定性。研究认为,在所试验的5种防护材料及由其构成的防护体系中,水性氟碳涂层体系对混凝土建筑结构的防护能力与防护寿命是最为满意的。 相似文献
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本文通过对暴露长达10年的表面涂层混凝土试件和青岛市胶州湾大桥实体结构进行涂层粘结强度、氯离子浓度等测试,对涂层应用在混凝土结构上的长期防护效果进行了研究。结果表明:在冰冻海水环境暴露10年后,大气区、浪溅区和水变区混凝土表面涂层的粘结强度均超过1.5 MPa,符合现行规范要求;在浪溅区和大气区环境下,涂层对海工混凝土的长期防护效果较好,但在水变区环境下涂层的防护效果相对较差;有涂层混凝土试件的表观氯离子扩散系数与无涂层混凝土在水变区环境下已无明显差别;大桥实体结构中有涂层混凝土的表面氯离子浓度较无涂层混凝土降低了2.3~3.9倍,且涂层对于实体结构的抗氯离子长期侵蚀效果稍弱于小尺寸混凝土试件。 相似文献
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介绍了喷涂聚脲材料在彩涂钢板屋面防护中的应用及其发展前景。阐述了聚脲技术在彩钢屋面防护中的特点和施工工艺。研究结果表明,聚脲涂层具有优异的性能,能够抵抗自然条件下的腐蚀破坏,对彩钢屋面起到很好的防护作用。 相似文献
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海洋工程重防腐涂料的应用技术现状及发展分析 总被引:1,自引:0,他引:1
针对海洋腐蚀对海洋工程的影响及防腐蚀的意义,详细论述了海洋防腐涂料的种类、性能、要求,国际海工防腐标准对涂层配套的技术要求和试验指标,对当前长寿命、低表面处理、高固体分、无溶剂、水性化、环保低毒等海洋防腐涂料的研究重点及进展进行了介绍,分析了海洋防腐涂料应用现状及存在的问题,探讨了长寿命防腐涂料和高耐久复合涂层体系,提出了同寿命涂层设计理念。针对与国外的差距,提出了我国应加强基础性研究以及人才培养的建议。 相似文献
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Hai Ni Aaron H. Johnson Mark D. Soucek John T. Grant Andrew J. Vreugdenhil 《大分子材料与工程》2002,287(7):470-479
A series of polyurea and polyurethane ceramer coatings were formulated using hexamethylene diisocyanate (HDI) isocyanurate, alkoxysilane‐functionalized HDI isocyanurate, tetraethyl orthosilicate (TEOS) oligomers and cycloaliphatic polyesters. The coatings were prepared as a function of alkoxysilane‐functionalized HDI isocyanurate and TEOS oligomers concentration. Also, the effect of acid catalyst was investigated. The corrosion resistance of polyurea or polyurethane ceramer coating systems were evaluated using a prohesion chamber on aluminium alloy 2024‐T3 substrate. The polyurethane ceramer coatings were compared with the chromate pretreatment and the epoxy‐polyamide primer containing the chromate pigment. In addition to prohesion, the interface between the coating and substrate was characterized using X‐ray photoelectron spectroscopy (XPS). The prohesion data showed that the corrosion was inhibited by the TEOS oligomers. However, high concentrations of TEOS oligomers and acid catalyst produced blistering in the polyurea/polysiloxane ceramer coatings. The prohesion data also showed that the corrosion protection of ceramer coatings performed as well as the chromate pretreatment and competitively with the epoxy primer. From the XPS and prohesion data, a self assembling silicon oxide layer at the metal‐coating interface was proposed. 相似文献
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A novel class of polyurea-b-polyimide (PUI) block copolymer coating containing environmentally friendly aromatic polyurea has been successfully synthesized for corrosion protection of aluminum alloy 2024-T3 (Al 2024-T3). The PUI copolymer is able to self-assemble into a supramacromolecule by means of intra and inter-hydrogen bonds (H-bonds). The formation of H-bonds and effect of the later on the crystallinity of the copolymer was studied by using Fourier transform infrared spectroscopy (FTIR) and wide angle X-ray diffraction (WAXD). It was shown that increasing polyurea mole fraction up to 50 mol%, enhanced occurrence of H-bonding induced self-assembly, and resulted in remarkable enhancement in the degree of crystallinity, and corrosion resistance. Corrosion resistance and diffusivity of the copolymer coatings were investigated by electrochemical impedance spectroscopy (EIS), in a 3.5 wt% NaCl solution. The coating lifetime determined by using time-based corrosion resistance, was shown to be about 8 years for the optimized PUI copolymer coating. PUI coating synthesized by using 50 mol% of polyurea has a high contact angle (110°) and remarkably low surface energy of about 25.5 mJ/m2. 相似文献
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采用电化学阻抗谱研究了聚天门冬氨酸酯聚脲涂层在湿热环境作用下的失效行为,采用SEM研究了聚天门冬氨酸酯聚脲涂层失效前后表面形貌的变化。电化学研究结果表明:涂层湿热失效过程分为3个主要阶段:前期电解质在涂层中的渗透、中期基体金属腐蚀发生起始的过渡、后期基体金属的腐蚀扩展并导致涂层的失效。湿热试验中,涂层孔隙率和涂层吸水率均呈3个阶段变化,即快速增长阶段、缓慢增长阶段和稳定阶段,很好地验证了PAEP涂层湿热失效的3个过程。表面形貌研究发现,湿热试验4572 h后,涂层表面粗糙度增加,出现了裂缝等缺陷,表明涂层已经失去防护作用。 相似文献