钢结构防腐涂料的研究现状及发展方向

钢结构防腐涂料可以延缓外界对钢结构的腐蚀速度,目前是钢结构防腐工程中最有效、最经济的措施。本文研究了钢结构防腐涂料的分类以及各分类的常用品种和钢结构防腐涂料的应用现状,并且针对未来钢结构防腐涂料的发展作出预测。     

钢结构防腐蚀涂料施工应用技术

通过对现阶段钢结构迅速发展的原因及钢结构防腐蚀常用方法的论述,指出了防腐涂料的原理及作用、技术指标及主要影响因素、钢结构防腐涂料的选择与施工应注意的问题及其施工工艺。     

锌加涂膜镀锌特长效钢结构防腐涂料体系的应用研究

锌加涂膜镀锌防腐涂料体系是一种新型、长效、环保、便捷的钢结构防腐涂料体系,其底层采用锌加涂膜镀锌,面层采用高性能面漆。该防腐涂料体系具有防腐性能优异、施工简便、灵活等特点,已广泛用于钢结构工程的各领域,防腐保护年限达30～50年。     

水性钢结构防腐涂料的研究及发展前景分析

钢结构是设施建设及建筑领域重要的支撑结构,具有十分重要的应用价值,但由于钢结构在使用中极易受到水氧腐蚀,造成钢结构强度下降甚至出现断裂等情况.为保护钢结构材料,可使用防腐涂料产品对钢其进行保护,而水性防腐涂料作为安全环保的保护涂料具有较高研究意义.     

政策与法规

多项防腐涂料标准开始实施自2013年3月1日起,有多项防腐涂料标准开始实施。其中,GB/T 28699—2012《钢结构防护涂装通用技术条件》于2012年9月3日发布,适用于钢结构及钢结构附属件的防护涂装,标准规定了钢结构防护涂装的涂层体系技术要求、检验方法、检测及验收规则及典型的涂层体系,并规定了涂装作业的安全、卫生和环境保护的要求。HG/T 4336-2012《玻璃鳞片防腐涂料》发布于2012年11月7日,适用于以环氧树脂或其他树脂为主要成膜物质,以薄片状的玻璃鳞片为骨料、加入其他颜填料等制成的厚浆型防腐涂料,标准规定了玻璃鳞片防腐涂料产品的     

我国防腐涂料行业的现状与市场前景分析

受益于我国经济快速增长和钢结构建筑等下游市场空间巨大,防腐涂料行业高速发展。通过对我国防腐涂料行业现状的分析和对市场前景的预测,指出未来行业将向绿色环保、适应性及水性防腐涂料方向转变。     

《新颁建筑钢结构防腐涂料标准宣贯班论文集》订阅

<正>《新颁建筑钢结构防腐涂料标准宣贯班论文集》汇集了GB 30981—2014《建筑钢结构防腐涂料中有害物质限量》;GB/T30790.1-8—2014《色漆和清漆防护涂料体系对钢结构的防腐蚀保护第1~8部分》;HG/T 4758—2014《水性丙烯酸树脂涂料》;HG/T 4759—2014《水性环氧树脂防腐涂料》;HG/T 4761—2014《水性聚氨酯涂料》等多个标准,从标准的范围、分类、项目、指     

钢结构重防腐涂料涂装配套体系及案例分析

通过应用实例,介绍了钢结构重防腐涂料和涂装的配套体系。     

水性涂料产品新标准本日开始实施

<正>2015年6月1日起,HG/T 4761—2014《水性聚氨酯涂料》、HG/T 4759—2014《水性环氧树脂防腐涂料》、HG/T 4758—2014《水性丙烯酸树脂涂料》等3项水性工业涂料产品行业标准正式实施,这是我国水性工业涂料发展过程中又一个重要里程碑。而强制性国家标准GB 30981-2014《建筑钢结构防腐涂料中有害物质限量》和8项钢结构防腐涂料国家标准GB/T 30790.1~8《防护涂料体系对钢结构的防腐蚀保护第1部分~第8部分》也已经分别于近期开始实施。至此,我国钢结构保护涂料全新的标准体系已初步形     

涂料在钢结构防腐中的应用

介绍了钢结构的性能特点和防腐蚀的方法。重点介绍了涂料在钢结构防腐中的作用原理以及所用涂料类型。展望了防腐涂料的发展趋势。     

Gas permeability of firebrick structures

Summary The gas permeability of a refractory fireclay structure is ten or a hundred times greater than that of the refractory itself.Gas permeability of a refractory structure based on cement-grog mortar with thick joints is quite low. The same structure involves 15–20% less labor compared with a structure based on mortars with thin (1–1.5 mm) joints. This structure can be used where other causes do not prohibit its use.Results obtained can be used for planning such units where the gas permeability is important not only for preserving the structure but also for operating the heating installation. The control of the quality of the refractory structure should be made first in relation to gas permeability, using the equipment described above as the basis of the tests.     

STRUCTURE FORMATION OF COATED FILMS WITH DISPERSED PIGMENTS DURING DRYING

ABSTRACT

In the drying of coated films with dispersed pigments, such as floppy disks, the structure of the film is formed during the drying process and depends on the drying condition. It is important to understand the structure formation during drying for the design of the dryer and die better quality of the product. We measured die drying characteristics of the film and determined the structure of dried film experimentally. A qualitative model for the structure formation during drying of the coated film is suggested.     

Biomimetic high toughness Si3N4 ceramics with inverse-bouligand structure

Inspired by the Bouligand structure in nature, a kind of Inverse-Bouligand structure was designed. Different from the bionic Bouligand structure of a one-dimensional material unit, the inverse-Bouligand structure is obtained by stacking and twisting the ceramic layer with a parallel groove structure. The grooves arranged in parallel are first etched on the ceramic green body and then sintered after stacking and twisting. After sintering, the groove structure can still be maintained, so the resulting laminated twisted groove structure in the bulk forms an inverse-Bouligand structure, which can promote crack deflection and improve the toughness of the material during the fracture process. After testing different twist angles, the results show that when the twist angle is 15°, the toughness of the material can reach 11.22 ± 1.77 MPa m^1/2, and high strength can be guaranteed. The synergistic effect of interlayer crack deflection and regional crack twist is the main mechanism for the improvement of material toughness.     

Ideal Polymer‐LC Composite Structure for Terahertz Phase Shifters

An ideal polymer/liquid crystal (LC) composite structure for terahertz phase shifters is proposed, and the fabrication method of the ideal structure using polymerization induced phase separation is reported. The ideal structure consists of four significant factors: i) the polymer structure surrounds LC droplets like polymer dispersed liquid crystals; ii) the size of the LC droplets is on the order of micrometers; iii) the polymer concentration is much lower than LC concentration like polymer‐stabilized liquid crystals; and iv) the nematic director both within and among the LC droplets has the same orientation. Such a structure is fabricated by photopolymerizing a nematic LC doped with 7 wt% mesogenic monomer under a critical temperature slightly lower than the clearing point of the LC mixture. The polymer/LC composite demonstrates both a short decay response time of 80 ms and a phase shift of 30° for terahertz wave at a frequency of 0.4 THz. Additionally, the transmission loss of the composite for the terahertz wave is discussed.     

Effect of the combination of inverse opal photon superficial areaic crystal and heterojunction on active free radicals and its effect on the mechanism of photocatalytic removal of organic pollutants

For the inverse opal photocatalyst, hydraulic pressure and other problems caused by the ordered structure of the inverse opal photocatalyst make it difficult for the pollutants to enter the structure quickly and effectively, so the effective control of its structure has become an urgent problem to be solved. Here, multi-heterojunction inverse opal structure catalyst with multi-level branched pore structure is prepared by the sol-gel method. The special three-dimensional dendritic porous structure solves the problem that a pollutant solution is difficult to effectively enter a skeleton with the traditional ordered inverse opal photocatalyst. This structure can also lead to the nanocrystallization of TZS powders, thus promoting the formation of the intermediate product ZrTiO₄ and optimizing the heterogeneous interface in the TiO₂–ZrO₂ heterojunction, thereby successfully constructing the multi-heterostructure and effectively improving the redox ability. Furthermore, by adjusting the loading amount of TZS, the matching of the heterojunction and the inverse opal structure can be effectively controlled, the matching of the photonic band gap and the forbidden bandwidth can be effectively adjusted, and the degradation efficiency is greatly improved. This study provides a new idea for effective collaboration between multi-heterogeneous interfaces and 3D branch fractal structures.     

Flexibility of Structure and Glass-Forming Ability: A Chemical Approach

Abstract[—The flexibility of the internal structure of solids stems from the free motion of their structural units without discontinuity of the structure as a whole. The flexibility is a necessary factor for the formation of a disordered glass structure and determines the glass-forming ability and sizes of glass formation regions in oxide systems. The glass transition phenomenon is a consequence and an indication of the high flexibility of glass structure. Crystallization of a multicomponent glass is governed, to a large extent, by structural–chemical factors. The sequence of the formation of different crystalline phases along the crystallization path with an increase in temperature corresponds to the sequence of liberation of glass structure components, which is determined by the strength of chemical bonds and the flexibility of glass structure.     

Preparation and characterization of TiO2 anode film with hierarchical structure by photo-induced polymerization method

The TiO₂ photoanode film with hierarchical structure which consists of porous structure and spinodal phase separation structure with macroporous continuous skeleton was fabricated by photopolymerization induced phase separation method. The influence of the different photomonomers, different coating layers and different heat treatment temperatures on the structure and photoelectric property of TiO₂ film has been investigated and the possible mechanism was proposed. The performances of the TiO₂ anode film were characterized by scanning electron microscopy, X-ray diffraction and I–V test. The results indicated that, in contrast with the TiO₂ anode film with single structure, the as-prepared TiO₂ anode film with hierarchical structure showed higher photoelectric conversion efficiency which is 0.272 %. Even though the photoelectric conversion efficiency is not very high, the strategy presented in the paper should be valuable and it still provides the ideas for the new structure and new preparation method on photoanode film of dye-sensitized solar cells, meanwhile, it lays the foundation for designing the solar cells with high photoelectric conversion efficiency.     

The implementation of dual-band electromagnetically induced transparency metastructure based on micro-strip line structure and Calcium-magnesium-titanium ceramic

In this paper, a metastructure based on micro-strip lines (MSL) structure and Calcium-magnesium-titanium (CMT) is proposed to realize the electromagnetically induced transparency (EIT) phenomenon. In this structure, the MSL as the main structure acts as the bright mode, while the ceramic structure composed of CMT material cylinders acts as the dark mode. The EIT characteristics are simulated and analyzed, while the equivalent circuit model is established. What's more, the EIT effect of the designed structure is verified by experiments, providing convincing evidence for the dual-band EIT performance of the structure. The results show that the dual-band EIT effect is achieved in 0.2 GHz∼1.6 GHz by coupling the CMT structure with the MSL structure, and the values of both transmission peaks reach more than 90%. The physical mechanism of the EIT phenomenon is analyzed by simulating the response of bright mode and dark mode to electromagnetic waves, respectively. Compared with the previously studied EIT MSs, the proposed structure can achieve the EIT effect in dual bands with wider bandwidth, which has a certain application value in the field of optical cache.     

Enhanced lithium storage performance of silicon anode via fabricating into sandwich electrode

Silicon electrode with sandwich structure as anode of lithium ion batteries is fabricated by adding a carbon layer between current collector and active coating. The prepared silicon electrode with the sandwich structure can exhibit high reversible capacity of 2500 mAh g⁻¹ for 30 cycles, which is much higher than that of bare silicon electrode with normal structure. The electrochemical impedance spectroscopy and electrode morphologies characterizations show that the improved performance of sandwich electrode is attributed to the carbon layer, which not only enhances the electric conductivity at the current collector/active coating interface but also releases the rigid stress caused by volume change of silicon. The results demonstrate that such sandwich structure is a potential facile method for performance improvement of silicon-based anode compared with the previous reports.     

Simulation with an improved plasma model utilized to design a new structure of microwave plasma discharge for chemical vapor deposition of diamond crystals

A new structure of microwave plasma for chemical vapor deposition of diamond crystal is proposed. The structure is designed numerically, for which an improved model given in our previous work [H. Yamada et al., J. Appl. Phys. 101 (2007), art. no. 063302.] is utilized. The experimental observations and numerical predictions agree well with each other. It is demonstrated experimentally that the proposed structure can achieve a growth rate larger than 50 μm/h over an area 1 in. in diameter.