大体积混凝土施工技术

本文针对大体积混凝土的施工特点,从大体积混凝土的原材料质量要求、浇筑、振捣及养护方面进行分析施工过程中应注意的事项,从而确保大体积混凝土工程的施工质量。     

Alkaline treatment kinetics of calcium phosphate by piezoelectric quartz crystal impedance

Calcium phosphate film was prepared by electrochemical deposition technology. Subsequently, the alkaline treatment process of calcium phosphate film in 0.1 mol/L NaOH solution was monitored on real time by the piezoelectric quartz crystal impedance (PQCI) technique. The variations of morphology and composition for the alkaline treatment products were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), respectively. The dynamic variations of calcium phosphate can be characterized by the change of equivalent circuit parameters. The results show that the forming process of hydroxyapatite (HA) is composed of three stages: (1) acidic calcium phosphate dissolution; (2) phase transformation; and (3) HA formation. Furthermore, the correlative kinetic equations and parameters are obtained by fitting the static capacitance (C _s)—time curves. Foundation item: Project(2005CB623901) supported by the Major State Basic Research and Development Program of China     

有机硅改性环氧-聚氨酯乳液的合成与性能研究

以异佛尔酮二异氰酸酯(IPDI)、聚氧化丙烯二醇(PPG)、二羟甲基丙酸(DMPA)为主要原料,用4%的环氧树脂和3%的氨基硅烷复合改性合成了有机硅改性环氧-聚氨酯乳液,乳液外观呈黄白色且具有较好的稳定性。用红外光谱仪、接触角测定仪、热重分析仪对涂膜的结构和性能进行了检测,结果表明:聚合物中因环氧树脂的交联作用和Si—O键的存在,涂膜表面憎水性增强、耐水性和耐热性得到提高。     

钴基热致变色材料及多变色示温涂层的制备

目的 制备一种在120～200℃内具有多种热致变色行为的不可逆示温涂层,用于快速排查和准确记录电网设备过热故障发生地点.方法 首先以碳酸钴和氯化钴为原料,用简单的溶液法在水中制备了两种钴基热致变色材料.再以有机硅WB300树脂作为成膜物,自制的两种材料和偏钒酸铵作为变色颜料,高速研磨4～5 h,获得变色涂料.通过XPS、XRD、FT-IR和SEM等测试手段对变色材料进行结构和微观形貌表征.于干燥箱加热观察涂层在120～200℃内的热色性,并用色差计和图像处理软件对变色点进行数据化处理.结果 结合XRD、XPS、FT-IR和TG等一系列表征,证明深绿色的三草酸合钴酸钾在130℃变为粉红色的草酸钴,玫瑰红色的磷酸钴铵在180℃变为深蓝色的磷酸氢钴.涂层附着力达到一级,耐冲击性为50 cm未出现涂层破裂,硬度为2H,在120～200℃具有5～6个变色点,并建立了色-温函数模型.结论 成功自制两种钴基热致变色材料.通过配色,成功制备了色差明显的多变色示温涂层,基本物理性能均满足常规涂层国家标准,涂层加热至200℃都变为黑色,不再改变.     

绝缘层下电磁线表面发黑原因分析

通过Ｘ射线衍射和ＸＰＳ对电磁线绝缘膜下表面黑膜及模拟腐蚀试样的表面膜进行了分析,测得表面黑膜主要由Ｃｕ２Ｏ、ＣｕＯ、ＣｕＣＯ２、Ｃｕ（ＯＨ）２、Ｃｕ的氯化物和硫化物以及钠盐、ＳｉＯ２等组成。由此对电磁线绝缘膜下表面发黑的原因进行了探讨。     

环氧聚氨酯耐油涂料的研制

通过选择适当的聚酯树脂和环氧树脂，配以适当的异氰酸固化剂，研制了一种用于油箱的环氧聚氨酯耐油涂料。检测结果表明，该涂料具有良好的低温干燥性能、耐腐蚀性能，优异的耐油性能特别是耐高温油性能。该涂料将在各种工程设备的油箱中具有广阔的应用前景。     

水性聚氨酯化学改性研究进展

介绍了几种水性聚氨酯化学改性的研究进展,包括环氧树脂、丙烯酸树脂、有机硅氧烷等二元共聚改性及两种以上树脂的三元共聚改性的研究状况.展望了水性聚氨酯化学改性的发展趋势.     

电脱盐切水换热器联合保护的研究与设计

通过对中石化长岭分公司电脱盐切水换热器的腐蚀原因和工作介质分析,提出采用涂层与牺牲阳极联合保护的防腐方案对该设备进行保护.采用极化曲线对牺牲阳极材料、选用涂料的防腐性能以及阴极保护参数进行了研究,并对联合保护进行了简单工艺计算,为该保护法在电脱盐切水换热器上的应用提供了参考和指导.为验证该保护方案的合理性和保护效果,在换热器模型上进行了模拟试验,牺牲阳极溶解特征和换热管的腐蚀情况表明该防腐方案合理可行.     

Electrochemical behavior of CoCl2 in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate

The electrochemical behavior of CoCl2 in 1-butyl-3-methylimidazolium hexafluorophosphate （[bmim]PF6） was investigated by cyclic voltammetry. The cyclic voltammograms were obtained from electrochemical measurement under different temperatures, and the reversible behavior for Co^2＋/Co^3＋ redox couple on glassy carbon electrode in [bmim]PF6 was confirmed by the characteristic of the peak currents. The diffusion coefficients （about 10^-11m^2/s） of Co^2＋ in [bmim]PF6 under different temperatures were evaluated from the dependence of the peak current density on the potential scan rates in cyclic voltammograms. It is found that the diffusion coefficient increases with increasing temperature. Diffusion activation energy of Co^2＋ in [bmim]PF6 is also calculated to be 23.4 kJ/mol according to the relationship between diffusion coefficient and temperature.