聚苯胺型防腐涂层制备方法研究进展

聚苯胺涂料具备优异的防腐性能,在金属防腐领域应用前景广阔。本文从聚苯胺的结构和性能出发,综述了聚苯胺型防腐涂层制备方法的发展,指出复合法是聚苯胺防腐涂层制备技术未来发展的主要趋势,最后对聚苯胺型防腐涂层制备技术的研究方向进行了展望。     

聚苯胺防腐涂料的研究进展

聚苯胺是一种新型的金属防腐保护材料,因其具有独特的抗点蚀性能,广泛应用于金属材料防腐、化学工业上防腐、海港等重要领域的防腐和航天等严酷条件下的防腐。文章综述了聚苯胺的防腐机理及近年来在金属制品防腐保护方面的应用。聚苯胺复合涂料具有常规防腐涂料不可比拟的长效耐腐蚀能力和抗静电性等防腐性能,聚苯胺复合型防腐涂料已经成为防腐材料的发展方向。     

石墨烯复合防腐涂料的研究现状与进展

石墨烯与附着力强、成膜性好的树脂结合可制备防腐性能优异的石墨烯复合涂料。不同的石墨烯加入量及树脂种类,都会影响复合涂料的性能,特别是其电学性能和防腐性能。简单介绍石墨烯与环氧树脂、聚苯胺树脂的复合制备方法,并对复合涂料的性能表征进行分析总结,阐述了石墨烯复合防腐涂料的关键技术与最新进展,以期对后续的研究提供新的思路。     

ZnO/E-51复合涂料上超疏水表面的制备

采用ZnO和环氧树脂机械搅拌制备ZnO/E-51复合涂料,通过真空袋压、室温固化成型,再通过化学刻蚀与表面修饰,在ZnO/E-51复合涂料上制备出超疏水表面。采用扫描电镜和动/静态接触角分析仪,表征表面的形貌和疏水性。结果表明化学刻蚀在复合涂料表面构建了具有微-纳米尺度二元粗糙结构;采用1%(质量分数)的硬脂酸修饰,可改变复合涂料表面微-纳米尺度二元粗糙结构,影响表面的疏水性能,当修饰时间为30min时,其表面与水的平均接触角最高达152.21°。     

柔性光电器件空穴注入层用聚苯胺/纳米ZnO复合材料的制备

弱磁场(0.4 T)下,采用原位聚合方法制备了重均分子量可达3×104的聚苯胺(PANI)及聚苯胺/纳米ZnO复合材料.UV-vis数据表明所制备的纳米ZnO的粒径约为3nm; FT-IR谱图表明纳米ZnO的加入使聚苯胺的特征峰向低波数方向移动;KH550改性纳米ZnO的引入显著地提高了PANI的导电性(220S/m)...     

原位聚合法制备聚苯胺改性MoS2及其环氧复合涂层的防腐性能

为提高环氧涂料的防腐性能,本文引入MoS₂纳米片作为阻隔剂,并在MoS₂纳米片表面原位聚合聚苯胺(PANI),制备了夹层结构i-PANI@MoS₂纳米片,利用PANI提高涂层的导电性,达到阳极钝化的效果。研究发现,当PANI与MoS₂的摩尔配比增大到7∶1时,MoS₂片层表面被PANI均匀覆盖,改性效果最好。与环氧树脂复合后,i-PANI@MoS₂-7纳米片在环氧树脂中均匀分散,复合涂层导电率提高,PANI与MoS₂起到了协同防腐作用,此时i-PANI@MoS₂纳米片既作为涂层中的阻隔剂,又作为电化学腐蚀保护剂,因此复合涂层具有最大的阻抗值、最大腐蚀电压以及最小的腐蚀电流密度,防腐性能优异。但PANI与MoS₂配比进一步增大,MoS₂纳米片表面的聚苯胺会发生团聚,导致复合涂层的防腐性能下降。     

纳米复合功能涂料产业应用技术若干新进展

纳米材料产业应用技术一直是我国产业界、投资界非常关注的热点,本文将重点介绍纳米改性聚氨酯(脲)防腐防水涂料、纳米复合反射隔热保温涂料、纳米结构防冰防污闪涂料等几种纳米复合功能涂料的研究与应用情况,尤其在产业工程应用方面的新进展。其中,纳米改性聚氨酯(脲)防腐防水涂料已在     

单甲基环取代聚苯胺防腐性能的研究进展EI北大核心CSCD

实验研究发现,取代聚苯胺或聚苯胺衍生物中存在的供电子基(如氧基、烷基、氨基等)能够有效提高聚苯胺涂层的防腐性能。其中单甲基环取代聚苯胺因其特有的高导电性、可逆的氧化还原等特性,已经成为防腐领域中的研究热点。文中通过介绍聚苯胺及其衍生物涂层的防腐性能以及不足,归纳总结了单甲基环取代聚苯胺衍生物(对位取代、间位取代、邻位取代)防腐涂层的防腐性能;复合改性材料对单甲基环取代聚苯胺衍生物涂层的防腐性能的提高;此外展望了单甲基环取代聚苯胺衍生物未来的发展趋势。     

纳米ZnO/聚苯胺复合材料的制备与表征

通过溶胶 凝胶法和O/W型乳液聚合法制备了经过十二烷基苯磺酸钠 (SDBS)修饰的纳米ZnO粉体和纳米ZnO/聚苯胺 (PAn)的复合材料 ,并进行了形貌、结构和性质的表征与分析。结果表明 ,纳米氧化锌晶形为六方晶系球形结构 ,粒径平均为 2 5nm。而纳米ZnO/PAn的复合材料也呈现出特殊的红外吸收特性 ,在 170 0cm- 1～ 330 0cm- 1出现 1个较强的吸收峰 ,同时因纳米ZnO的加入而使聚苯胺各特征峰振动强度均增强 ,所以可得出 ,纳米ZnO的掺杂对聚苯胺的红外光谱的影响较大     

单甲基环取代聚苯胺防腐性能的研究进展

实验研究发现,取代聚苯胺或聚苯胺衍生物中存在的供电子基(如氧基、烷基、氨基等)能够有效提高聚苯胺涂层的防腐性能。其中单甲基环取代聚苯胺因其特有的高导电性、可逆的氧化还原等特性,已经成为防腐领域中的研究热点。文中通过介绍聚苯胺及其衍生物涂层的防腐性能以及不足,归纳总结了单甲基环取代聚苯胺衍生物(对位取代、间位取代、邻位取代)防腐涂层的防腐性能;复合改性材料对单甲基环取代聚苯胺衍生物涂层的防腐性能的提高;此外展望了单甲基环取代聚苯胺衍生物未来的发展趋势。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.