Evaluation of the Hydrophobicity on Silicon Rubber Coating with Loads of Alumina Trihydrate and Nanosilica for Use in Electrical Insulation Coatings

2015 ◽  
Vol 820 ◽  
pp. 405-410
Author(s):  
Daniella Cibele Bezerra ◽  
Ignat Pérez Almirall ◽  
Edson Guedes da Costa ◽  
Ana Cristina Figueiredo de Melo Costa ◽  
Edcleide Maria Araújo
Keyword(s):  
Silicone Rubber ◽  
Room Temperature ◽  
Salt Spray ◽  
Rubber Matrix ◽  
Spray Chamber ◽  
Heterogeneous Distribution ◽  
The Matrix ◽  
Rubber Coating ◽  
Rubber Coatings ◽  
Alumina Trihydrate

This study aims to evaluate the hydrophobicity of vulcanized silicone rubber coatings at room temperature (RTV SR) with loads of alumina trihydrate (ATH) and nanosilica (NS) in the polymeric silicone rubber matrix, in order to obtain coatings ATH/NS/RTV SR to cover the surface of glass electrical insulators. The coatings were characterized by scanning electron microscopy (SEM), testing in salt spray chamber, loss test and recovery of hydrophobicity. These coatings showed varying sizes of agglomerates and heterogeneous distribution of particles within the matrix RTV SR. In the test in salt spray chamber smaller leakage current values was observed for the insulator coating with the ATH/NS loads. In the loss and recovery of the hydrophobicity test the best result was observed for insulating load RTV SR / 20: 1 (ATH: NS).

scholarly journals Influence of Silicone Rubber Coating on the Characteristics of Surface Streamer Discharge

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3784
Author(s):  
Xiaobo Meng ◽  
Liming Wang ◽  
Hongwei Mei ◽  
Chuyan Zhang
Keyword(s):  
Silicone Rubber ◽  
Electrical Power ◽  
Electrical Power System ◽  
Streamer Discharge ◽  
Reliable Operation ◽  
Pollution Flashover ◽  
Flashover Voltage ◽  
Streamer Propagation ◽  
Rubber Coating ◽  
Rubber Coatings

A pollution flashover along an insulation surface—a catastrophic accident in electrical power system—threatens the safe and reliable operation of a power grid. Silicone rubber coatings are applied to the surfaces of other insulation materials in order to improve the pollution flashover voltage of the insulation structure. It is generally believed that the hydrophobicity of the silicone rubber coating is key to blocking the physical process of pollution flashover, which prevents the formation of continuously wet pollution areas. However, it is unclear whether silicone rubber coating can suppress the generation of pre-discharges such as corona discharge and streamer discharge. In this research, the influence of silicone rubber coating on the characteristics of surface streamer discharge was researched in-depth. The streamer ‘stability’ propagation fields of the polymer are lower than that of the polymer with silicone rubber coating. The velocities of the streamer propagation along the polymer are higher than those along the polymer with silicone rubber coating. This indicates that the surface properties of the polymer with the silicone rubber coating are less favorable for streamer propagation than those of the polymer.

scholarly journals All-Solid-State Sodium-Selective Electrodes Based on Room Temperature Vulcanizing-Type Silicone Rubber Matrix.

1997 ◽  
Vol 13 (Supplement) ◽  
pp. 289-294 ◽  
Author(s):  
Hyun Jung Lee ◽  
Hyun Joon Oh ◽  
Gang Cui ◽  
Geun Sig Cha ◽  
Hakhyun Nam
Keyword(s):  
Solid State ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Rubber Matrix

Excimer Laser Treatment of Steel Fibers for Improved Adhesion to Silicone Rubber

2020 ◽  
Author(s):  
Erol Sancaktar ◽  
Xiaoxiao Liu
Keyword(s):  
Adhesion Strength ◽  
Silicone Rubber ◽  
Bonding Strength ◽  
Test Method ◽  
Rubber Matrix ◽  
Scanning Calorimetry ◽  
Silicon Rubber ◽  
Pull Out ◽  
The Matrix ◽  
Laser Treatments

Abstract Former investigators observed characteristic laser-induced structure on synthetic fibers and steel cord surfaces after irradiation, which is considered by us as an advantageous factor in developing bonding strength of fiber-elastomer composites. We applied various UV laser treatments on the surfaces of steel fiber in order to obtain similar topographic features. Surface modification was observed under scanning electron microscope (SEM). In consideration as factors in bonding strength, mechanical properties of the matrix elastomer (silicon rubber) had been tested in addition to its thermal properties by differential scanning calorimetry (DSC) and Carbon Black (CB) filler dispersion properties by atomic force microscopy (AFM). As the main test for adhesion strength, we performed a fiber pull-out test method developed by our research group for bonding strength of cord fibers to silicon rubber in both neat and CB filled forms for comparison purposes. Our experiment results revealed better adhesion strength when using silicone rubber matrix reinforced with CB.

scholarly journals Surface Recovery Investigation of Silicone Rubber Composites for Outdoor Electrical Insulation under Accelerated Temperature and Humidity

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3024
Author(s):  
M. Hassan Raza ◽  
Abraiz Khattak ◽  
Asghar Ali ◽  
Safi Ullah Butt ◽  
Bilal Iqbal ◽  
...  
Keyword(s):  
High Temperature ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Nano Silica ◽  
Rubber Composites ◽  
Temperature And Humidity ◽  
Before And After ◽  
Overall Performance ◽  
Alumina Trihydrate ◽  
Better Than

Degradation of silicon rubber due to heat and humidity affect its performance in outdoor applications. To analyze the effects of high temperature and humidity on room temperature vulcanized (RTV) silicone rubber (SiR) and its composites, this study was performed. Five different sample compositions including neat silicone rubber (nSiR), microcomposites (15 wt% silica(SMC 15% SiO2) and 15 wt% ATH(SMC 15% ATH), nanocomposite (2.5 wt% silica(SNC 2.5% SiO2) and hybrid composite (10 wt% micro alumina trihydrate with 2 wt% nano silica(SMNC 10% ATH 2% SiO2) were prepared and subjected to 70 ˚C temperature and 80% relative humidity in an environmental chamber for 120 h. Contact angle, optical microscopy and Fourier transform infrared (FTIR) spectroscopy were employed to analyze the recovery properties before and after applying stresses. Different trends of degradation and recovery were observed for different concentrations of composites. Addition of fillers improved the overall performance of composites and SMC 15% ATH composite performed better than other composites. For high temperature and humidity, the ATH-based microcomposite was recommended over silica due to its superior thermal retardation properties of ATH. It has been proved that ATH filler is able to withstand high temperature and humidity.

Superhydrophobic RTV Silicone Rubber Coatings on Anodized Aluminium Surfaces

2012 ◽  
Vol 706-709 ◽  
pp. 2546-2551 ◽  
Author(s):  
Gelareh Momen ◽  
Masoud Farzaneh
Keyword(s):  
Contact Angle ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Water Contact ◽  
Angle Measurements ◽  
Atomic Force ◽  
Static Contact ◽  
Contact Angle Measurements ◽  
Rubber Coatings ◽  
Rtv Silicone Rubber

A superhydrophobic surface was elaborated using two inexpensive industrial processes: surface anodization in phosphoric acid and spin coating of the anodized surface by RTV silicone rubber. Scanning electron microscopy (SEM), atomic force microscopic (AFM) and water contact angle measurements have been performed to characterize the morphological features, and wettability of the surfaces. The water static contact angle of the elaborated surface reached 157 ° at room temperature. At supercool temperature (-10°C) the superhydrophobic coating showed an important delayed freezing time.

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