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RTV Silicone High Voltage Insulation Coating

High Voltage Insulator Coating (HVIC)


INTRODUCTION

Hangkai high voltage insulator coating(HVIC) is a ready-to-use room temperature vulcanized(RTV) silicone product that independently developed by our company and has obtained product invention patent. Hangkai high voltage insulator coating (HVIC) has passed and got type test reports of 1000h, 1700h, 5000h UV&Salt fog Accelerated Weathering test, Inclined Plane Tracking&Erosion test, Dry Arc Resistance and other tests issued by laboratory member of the Short-circuit Testing Liaison(STL).

 

Fluorine-containing raw material is added to the product. With the improvement of basic polymers, the addition of fluorine-containing silicon materials, and the replacement of methyl groups with fluorine groups, Hangkai High voltage insulator coating(HVIC) enhances not only the adhesion between the coating and the substrate to be coated, but also the hydrophobicity and water repellency migration, oil resistance, weather resistance, UV resistance and self-cleaning properties of the coating , and the surface properties of the original coating are improved.

 

The fillers use nano-scale Al(OH)3 and SiO2. Compared with ordinary fillers, nano-scale fillers enhance the interaction between the interface of the substrate and can be more fully dispersed into the matrix glue, with more surface active points, the physical adsorption effect on silicone rubber molecules is enhanced, and the adsorption performance is increased, thereby effectively improving the mechanical properties of the mixture, improving the tensile strength, elongation at break and heat resistance of the coating, and enhancing the wear resistance,the adhesion and hardness of the coating.

 

The addition of vapor-phase nanoscale SiO2 doubles the aging resistance of the coating. Due to the extremely small particles are larger than surface area, the web structure can be formed quickly when the coating dries, and the physical strength and smoothness of the coating can be increased at the same time. In addition, the nano-silica particles added can improve the dielectric strength and wear resistance of the coating.

 

A single component, RTV, moisture cure, high-build polysiloxane coating providing excellent long-term hydrophobicity, hydrophobicity recovery, electrical characteristics and UV tolerance leading to suppression of leakage current,Strong arc resistance and tracking resistance, reduction of pollution related flashover risk, a long service life and significant increase in pollution flashover voltage level.Intented application areas are as follows:


  • For transmission lines and substations from low voltage to high voltages

  • For high contaminants environment,including salt fog, sandstorm, cement dust,acid emission,high UV light, high humidity, chemical pollutant,corrosion area,etc

  • Refresh coating over old coating

  • In high-speed train, railway and other high voltage application.

 


TECHNICAL DATA SHEET

UNCURED

Properties

Value

Color

Gray,Red,White or custom

Solid content(Volume)

50%

Solid content(Weight)

70%

Viscosity

2500-3000 cP

Shelf life

12 month

Flash Point

19℃

Skin-over time(drying   time)

8-20 minutes

Tack-free time(drying   time)

30-60 minutes

Cure through(drying time)

8-12 hours

Full physical   characteristics(drying time)

7-10 days

Package

4L pail; 20L pail

Storage

Store in dry, shaded   conditions away from sources of heat or ignition.


Method of Application

Airless Spray, Dip   coating, Brush


Environment Temperature

-40-60℃


 

 

CURED

Dissipation Factor (ASTM   D150 by Powertech Lab)

0.006 at 100kHz

Dielectric constant (ASTM   D150 by Powertech Lab)

2.977 at 100kHz

Volume Resistivity (ASTM   D257 by Powertech Lab)

7.602*10¹⁵ Ohm. Cm

Surface Resistivity (ASTM   D257 by Powertech Lab)

2.223x1012  Ohm per cm²

Dry Arc Resistance (ASTM   D495 by Powertech Lab)

Track:311sec

Water Repellency Angle   (IEC 62073 by Powertech Lab)

Static:105.8 degrees

Advancing: 100 degrees

Receding: >80 degrees

UV&Salt fog   Accelerated Weathering (IEC62217 & IEC61109, 1000hours by KEMA Lab)

PASS

Inclined Plane Tracking   & Erosion Test (IEC60587 by Powertech Lab)

PASS:1A4.5

Water Blast Test (IEEE   957)

PASS

100hrs Boiling Water Test

PASS

Temperature Stability

-40 to 250℃

Hardness shore A

>50

Tear strength

>7kN/m

Elongation at break

> 200%

Tensile Strength

>3N/mm²


APPLICATION

Cleaning:

  • Prior to applying the coating, all surfaces must be dry,free of dirt, grease, oil and other materials. There are two ways suggested to clean the surface:

  • l High pressure water washing, with a dry abrasive cleaner if necessary, crushed corncob or walnut shells.

  • l Ultrasonic cleaning equipment: 100% cleaning effect on lightly polluted insulators and 98% cleaning effect on seriously polluted insulators can be achieved with the ultrasonic cleaning technology (please check the before Fig1 and after picture Fig2  in Pakistan Project)                                                                                                                                                                                            


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Fig1Fig2


Application Way:

Surfaces should be clean and dry before application. The ideal operation temperature is 5-50℃,thickness (DFT) suggested is 380 micron to 500 micron.

Airless Spray(Fig3)

- Customer could spray based on experience of spraying similar viscosity RTV coating. If necessary, please consult Beijing Hangkai Electric Co.,LTD. for further advice.

Brush

- Customer applicate coating according to experience.

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Fig3

Dip Coating (Fig4)

- Compared with spraying, our dip coating equipment with single axis

and a four linkage improved application efficiency of above 30%. Usually thinner will be added when application.

Safety Precautions

- The product is intended for use only by professional applicators in industrial situations

- All work involving the application and use of this product should be performed in compliance with all relevant national, Health,Safety&Environment standards & regulations.

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Fig4


CAPACITY & EQUIPMENT

RTV Silicone HVIC Workshop


- Located in Tianjin, China.

- Covering area of 2,000 square meters.

- Annual output of 5,000 tons of RTV Silicone high voltage insulator coating material.

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China Compound Workshop


- Located in Tianjin, China.

- Covering area of 3,400 square meters.

- Daily application capacity of 20,000 pieces.

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Mobile Dip Coating Equipment


- Flexible Application.

- Improve efficiency and lower cost of packing insulators and transportation.

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Pakistan Compound Workshop


- Located in Karachi, Pakistan.

- Covering area of 1000 square meters.

- Daily production capacity of 5000 pieces

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Special Ultrasonic Cleaning Equipment


- Using ultrasonic technology, using water-based cleaning material.

- Available for exporting.

- Daily cleaning capacity of 7,800 pieces.

- Environment friendly.

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QUALITY CONTROL

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 ISO 9001 Certificate of Quality 

Management System

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IS014001 Certificate of Environment 

Management System

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OHSAS 18001Certificate of Occupational 

Health and Safety Management System

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 Inclined Plane Tracking and Erosion Test as per IEC 60587

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Angle of Hydrophobicity as per IEC TS 62073

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UV&Salt fog Accelerated Weathering 1000hrs  as per IEC62217 & IEC61109

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Artificial Pollution Test by Salt Fog Method as     per IEC 60507

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Hydrophobicity Recovery by Corona Test

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Dielectric Strength Test as per ASTM D149a

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Volume & Surface Resistivity Test as per ASTM D257

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Dissipation Factor Test as per ASTM D150

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Dry Arc Resistance as per ASTM D495