RTV防污闪涂料性能的影响因素

介绍了室温硫化（RTV）硅橡胶防污闪涂料的作用机理。分析了RTV防污闪涂料性能的影响因素。提出了RTV防污闪涂料存在的问题及发展建议。     

导热模型在室温硫化硅橡胶防污闪涂料中的应用

为研究导热模型在室温硫化（ RTV）硅橡胶防污闪涂料中应用的可行性，通过添加导热填料的方式制备了 RTV硅橡胶防污闪涂料，使用该涂料制备了涂层样品，对样品进行了表征，并采用现有导热模型对测试结果进行拟合。结果表明：在实际的复杂的 RTV硅橡胶涂层体系中，可以使用简 洁的数学表达式 k_c =∑k_i (φ_i)^di较好地拟合测量数据，其中(φ_i)^di用颗粒连续度 C_i来表示，该模型对 RTV硅橡胶防污闪涂料的产品设计、生产都会起到一定的指导作用     

室温硫化硅橡胶的研究及其在防污闪涂料中的应用

概述了室温硫化硅橡胶(RrrV)用填料方面的研究进展,介绍了室温硫化硅橡胶在国内外电力系统防污闪领域中的应用,对目前RTV防污闪涂料在应用中所存在的问题及其解决方法提出了看法,展望r RTV防污闪涂料的应用前景.     

硅橡胶防污闪涂料涂覆工艺

电器设备涂覆硅橡胶防污闪涂料(RTV涂料)后能够大幅度提高污闪电压,本文在丙烯酸聚氨酯底漆上,采用不同的方法刷涂RTV防污闪涂料并研究其附着情况,发现底漆中-OH含量提高、干燥处理及加入偶联剂均有利于防污闪涂层的附着,而底材固化后放置时间的延长却不利于防污闪涂层的附着,并初步分析了原因.     

纳米氟碳涂层在防污闪领域的应用研究

介绍了一种新型纳米氟碳防污闪涂料。由于特殊的结构设计,涂层在憎水性、机械性能、防污闪性能、自清洁、融冰等诸方面皆有上佳表现。而目前使用较多的RTV涂料(室温硫化硅橡胶)综合性能一般,因此加大新型防污闪涂料的研究,可以继续促成防污闪工作的减轻和损失的减小。     

RTV硅橡胶防污闪涂层运行情况分析

综述了近几年国内室温硫化(RTV)硅橡胶防污闪涂层在电网中的运行情况,介绍了RTV硅橡胶防污闪涂层的憎水性,运行中RTV硅橡胶防污闪涂层失效的判断依据,以及失效后如何复涂等。针对四川省地理环境的特殊性,初步探讨了四川省RTV硅橡胶防污闪涂层的运行情况。     

输电线路用室温硫化硅橡胶防污闪涂料研究进展

室温硫化硅橡胶(RTV)以其独特的憎水性、憎水迁移性被用作新一代的防污闪涂料,给电力工业带来了巨大的经济和社会效应。大幅度提高RTV防污闪涂料的性能,达到国际先进水平,对电力系统确保无污闪事故发生具有极其重要的现实意义。本文综述了室温硫化硅橡胶的性能和应用,以及无机纳米微粒对室温硫化硅橡胶的增强研究进展。     

在室温硫化硅橡胶防污闪涂料中纳米技术的应用

近年来室温硫化硅橡胶防污闪涂料(以下简称RTV涂料)由于具有耐污闪能力强，寿命长，涂覆工艺简单等突出特点，一直被电力系统运行单位所采用。它作为电力设备外绝缘防污闪的一项重要措施，几年来在输电和变电设备上进行了广泛的应用并以广泛的成绩逐渐被广大运行单位接受，同时对电网的安全稳定运行起到了重要的保证作用。     

RTV防污闪涂料自动化浸涂工艺研究

设计了RTV防污闪涂料自动化浸涂工艺参数并研制了配套浸涂设备,实现了浸涂工序的自动化生产,提高了涂覆效率,减少了生产过程中的VOC排放,避免了粉尘污染,降低了RTV涂料的消耗,适用于各类绝缘子。采用该浸涂工艺制备的绝缘子RTV涂层外观一致性好、厚度均匀。     

RTV防污闪涂料的研究

介绍了单组分RTV防污闪涂料的硫化机理、配制方法和基本组成，重点讨论了影响涂膜性能的各组分的功能及使用；并给出了产品的相关检测结果。     

氟硅橡胶及其在防污闪涂料中的应用

介绍了氟硅橡胶以及氟硅橡胶防污闪涂料的性质、应用状况和国内发展状况和动态,重点阐述了硅橡胶/氟硅橡胶并用配方、工艺以及并用胶性能,国内厂家生产情况。分析结果表明,室温硫化氟硅橡胶应用到防污闪涂料体系中在实验室取得了不错的效果,但是因氟硅橡胶价格昂贵,其应用推广进展较慢。考虑到其性能上的优势,其应用研究还需大力推进。     

输电线路污秽绝缘子串污闪机理分析与处理措施

结合变电运行管理经验,介绍对现场污闪事故处理措施,提出如何做好防污闪管理工作。     

粘结剂对超音速火焰喷涂碳化钨涂层磨粒磨损性能的影响

采用超音速火焰喷涂(HVOF)工艺在35钢基体上制备了WC-10Ni涂层和WC-12Co涂层,研究了镍、钴这两种粘结剂对WC涂层的显微硬度、摩擦系数和抗磨粒磨损性能的影响,采用扫描电子显微镜观察涂层磨损前后的表面形貌,探讨了WC涂层的磨粒磨损机理。结果表明,以HVOF方法制备的2种WC涂层均有较高的显微硬度,WC-10Ni涂层和WC-12Co涂层与SiC砂纸摩擦副之间的干摩擦系数相差不大。2种涂层在低载荷下均有较好的抗磨粒磨损性能,但在较高载荷下WC-12Co涂层的抗磨性明显优于WC-10Ni涂层。2种涂层的磨粒磨损形式主要为均匀磨耗磨损,磨损机理以微切削和微剥落为主。WC-12Co涂层的磨损表面损伤较轻微,综合性能优于WC-10Ni涂层。     

高疏水性硅橡胶防污闪涂料的制备及其性能研究

以端羟基聚二甲基硅氧烷、不同粒径的改性二氧化硅粒子、硅烷偶联剂及助剂为原料,采用有机-无机杂化纳米技术,制得具有高疏水性能的室温硫化(RTV)硅橡胶防污闪涂料。采用扫描电镜表征了涂层的表面形貌,用静态接触角测试仪测定了二氧化硅用量对涂层的憎水性及憎水迁移性变化。结果表明,固定纳米级二氧化硅的用量,当微米级二氧化硅用量为10份时,涂层表面形成一定的微米二级粗糙结构,涂层表面接触角为131.50,具有较高的疏水性能;同时,涂层也具有优良的憎水迁移性。此时,硅橡胶的拉伸强度为2.08 MPa,伸长率581%,撕裂强度5.65 kN/m,体积电阻率1.38×1015Ω·m,污秽湿工频闪络电压3 kV,阻燃性FV-0级。     

Performance of polyurethane-coated concrete in sewer environment

Polyurethane-based coatings are used to protect concrete facilities against corrosive environments. The performances of two commercially available polyurethane coatings were evaluated under sulfuric acid environment (representing sewer condition) for over 5 years. Both dry (representing new construction) and wet (representing rehabilitation) concretes were used in this study. A combination of the full-scale hydrostatic test, bonding test, and chemical resistance tests were performed to evaluate the coatings to protect concrete structures below ground water. The full-scale hydrostatic test was used to evaluate the application and performance of coatings under hydrostatic pressure to simulate underground concrete structures below ground water. Visual inspections and in situ bonding tests were performed on coated concrete under a hydrostatic pressure of 105 kPa. Test results showed that bonding strength of one coating was affected by the moisture condition and hydrostatic water pressure in the full-scale test. Coated cement concrete specimens with pinholes were used to study the chemical resistance of the coated concrete in sulfuric acid to represent the worst sewer condition. Change in weight of coated concrete specimens was measured at regular intervals. Types of failures in coated concrete under acidic environment have been identified. Test results showed that the performance of the two coatings were noticeably different and one coating with pinholes extended the service life of concrete by 14 times while the other coating extended the service life of concrete by 57 times. There was no direct correlation between bonding strength and chemical resistance of the polyurethane-coated concrete. Although both coatings were polyurethane-based, their performances were different under the testing conditions adopted in the study.     

A new method of moisture penetration measurement in protective coatings

Various methods are used by the paint and coating technologists to evaluate the resistance of protective coatings to penetration of water through them. This article intends to introduce a new, simple method for the moisture resistance evaluation. The method uses thin metal films as the sensor and is not absolute. However, it may be very useful for comparative experiments when the paint formulator seeks an optimum performance of coating developed for moisture protection.     

Computational design of thermoset nanocomposite coatings: Methodological study on coating development and testing

Thermoset nanocomposites (TSNCs) may offer significantly improved performance over conventional thermoset materials, and thus are attractive for wide industrial applications, especially in the coating industry. Design of TSNCs via experiment, however, faces various technical challenges due to design complexity. Computational design can provide deep insights and identify superior design solutions through exploring opportunities in a usually huge design space. This paper introduces a generic computational methodology for the design, characterization, and testing of TSNC-based coatings. A distinct feature of the methodology is its capability of generating quantitative correlations among material formulation, processing condition, coating microstructure and property, coating performance, and processing efficiency. The correlations can enable a comprehensive analysis for optimal TSNC coating design. Case studies will demonstrate the methodological efficacy and attractiveness.     

Effects of natural weathering on the fire properties of intumescent fire‐retardant coatings

Fire‐retardant coatings could be one option for providing enhanced protection to buildings during a wildfire, particularly when applied to combustible siding and in under‐eave areas. Limited studies have been conducted on their effectiveness but maintaining adequate performance after weathering has been questioned. This paper reports on a study evaluating the effect of natural weathering on the performance of intumescent‐type fire‐retardant coatings. The main concerns were (a) the reduction of ignition resistance of the coating after weathering and (b) the coating might contribute as a combustible fuel and assist the fire growth after weathering. This study evaluated the performance of 3 intumescent coatings that were exposed to natural weathering conditions for up to 12 months. A bench‐scale evaluation using a cone calorimeter was used to evaluate the performance of the coatings at 3 heat flux levels (30, 50, and 70 kW/m²). Our results showed that weathering exposure reduced the effectiveness of fire protection of intumescent coatings, but the weathered coatings did not act as additional fuels. Weathering orientation showed much less effect on the performance of intumescent coatings in comparison to other parameters. There was statistical evidence that weathering duration, heat flux level, and coating type affected the combustion properties.