Epoxy Resin and Hardener with Liquid Epoxy Resin Be Used for Dry Transformer

Product Description

Bi-component alicyclic saturated structure epoxy resin system /liquid can be used to the processes of APG& Conventional casting process under vacuum,Excellent UV resistance &heat shock resistance Excellent environmental performance and mechanical properties.

Applications Formulation:
 

Epoxy resin	WD2896F	100pbw
Hardener	WD2896F	100pbw
Filler	Silica flour(*10)	250pbw
Color paste	LC-serious	3pbw

 Detailed Images 

Properties

Two-componetnt epoxy resin system, liquid at room temperature, suitable for vacuum casting process.
Low cuiring shrinkage, dimensional stability of end product, excellent processing performance and high dielectric and mechanical properties.

Application

Medium and high voltage electrical insulation products, such as dry type transformers, 10-66kv current and voltage transfomers etc.


Product data
 

Properties	Unit	Value
Appearance	Visual	Transparent viscous liquid
Viscosity at 25ºC	mPa.S	7500-12000
Density at 25ºC	g/cm3	1.16-1.20
Vapour Pressure at 25ºC	Pa	<0.01
Flash point	ºC	about 135

Properties	Unit	Value
Appearance	Visual	Light yellow-yellowish liquid
Viscosity at 25ºC	mPa.S	300-600
Density at 25ºC	g/cm3	1.17-1.24
Vapour Pressure at 25ºC	Pa	about 0.5
Flash point	ºC	about 140

Epoxy resin WDE2896F and hardener WDH2896F with a certain quantity of filler can be processed by following conditions after fully mixed under vacuum conditions.

Process condition
 

Processing parameters	Vacuum casting
Epoxy resin/hardener mixture temperature	Premix 70ºC + final mix 15-30mins
Feeding process	100ºC/8h
Mold temperature	105ºC/4-6h
Gelation time	80ºC/6h+90ºC/4h+100ºC/2h+120ºC/2h
Post cure	130ºC/10h

Gelation time

Epoxy resin WDE2896F/Hardener WDH2896F=100/100
 

Temperature	Gelation time
at 120ºC	24-40mins
at 140ºC	12-20mins
at 160ºC	6-10mins

Condition: 120ºC*4h+140ºC*8h
Note: the following data are tested based on GB standard, and only for customers' reference, Detailed properties should be tested by in accordance with customers' actual conditions.
 

Properties	Value
Tg(DSC)	75-95ºC
Tensile strength	65-85N/mm2
Flexural strength	100-14N/mm2
Compressive strength	140-180N/mm2
Impact strength	9-16kj/m2
Curing shrinkage	0.8-1.0%
Flammability(4mm)	HB Class
Flammability(12mm)	HB Class

Properties	Value
Thermal conductivity	0.8-0.9W/mk
Thermal decomposition	>320°C
Water absorption (23°Cxl0days)	0.10-0.20 % by wt.
Water absorption (100°Cx60 mins)	0.08-0.15 % by wt.
Surface resistivity	1014Ω2
Volume resistivity	1015Ω2.cm
Dielectric strength	30kV/mm
Loss factor	0.02

Storage

The components have to be stored in tightly sealed and dry original containers in an environment at 6-35°C;. Under these conditions, the shelf life will correspond to the expiration date stated on the label ( normally 12 months). After this date, the product may be reanalyzed to confirm if it validates yet. Partial emptied containers should be closed tightly immediately after use.


Package
Resin 20kg / barrel or 240kg / barrel or 1200kg / barrel, curing agent 20kg / barrel or 240kg / barrel or 1200kg / barrel


First aid

Contamination of eyes by resin, hardener of casting mix should be treated immediately by flushing with clean,running water for 10 to 15minutes, a doctor should then be consulted.

Material smeared or splashed on the skin should be dabbed off, and the contaminated area then washed and treated with a cleaning cream. A doctor should be on the event of severe imitation of bums. Contaminated clothing should be changed immediately. Anyone taken ill after inhaling vapors should be moved out of doors immediately,in all case of doubt call for medical assistance.


WD2896 Application process recommendation

1. Preparation of ingredients

1.1 The casting mold should be preheated in the oven at 100-110°C fbr more than 10 hours, and above 4000kva transformer coil shall be given a longer preheating time,

To ensure that the coil is completely dry and its temperature is not less than 80°C when installed.

1.2 The silica powder shall be sealed to normal temperature fbr more than 6 hours in an oven at 110-120°C.

2. Ingredients

2.1 Static mixture degassing

2.1.1 Premixing

Material A (epoxy) is based on weight ratio, resin: filler: color paste 100:(125-color paste amount): proper amount, and mixed separately after adding resin, filler and color paste. The temperature is 65-70°C, stirring and degassing fbr no less than 2 hours, and 100 <p < 200pa.

Material B (curing agent) is based on the weight ratio, curing agent: filler 100:125, mixed separately, temperature is 65-70°C, stirring and degassing are not less than 2 hours, 100 < p < 200pa.

2.1.2 Final mixing

Then the components A and B are finally mixed, the accelerator agent is not needed, and put material A and B are mixed in the proportion of 100:100 into (or vacuum suction) final mixing tank, and in order to stir well, we advise put the resin and hardener at same or alternate time.

2.1.3 Start stirring after feeding,make sure the the spiral lifter can lift the mixture onto the umbrella degassing hood at its rotate speed.

2.1.4 After stirring fbr 15 minutes, start the vacuum pump fbr degassing. The vacuum degree shall not be less than 300pa. 

2.1.5 The mixing degassing time is about 15-30 minutes, and the degassing is completed when there is no bubble on the umbrella surface.

3. Casting

3.1 Set the casting tank temperature at 80-85°C, preheating shall start 4-5 hours before batching, and to ensure that the temperature of the mold during installation is not less than 80°C.

3.2 After batching, the dried and preheated mold is pushed into the casting tank fbr vacuum treatment.

3.3 The space temperature of the casting tank is 80-85 ° C, the vacuum degree is not less than 300pa, and the vacuum treatment time is not less than 2 hours.

3.4 The feeding should not be too fast during casting. It can be stopped fbr 10-15 minutes, and the vacuum can be continued fbr 20-30 minutes after the material is full. If possible, it can be pressurized by 0.2-0.3mpa after vacuum treatment.

3.5 The final mixing casting shall be completed within 90 minutes. Please strictly control the temperature and time to prevent tank solidification. The excess single component resin and curing agent can be stored fbr several days, but it must be sealed and the temperature should be well controlled.








Due to the storage conditions, this product may experience a small amount of precipitation during storage, which is a normal phenomenon. After stirring evenly, it can be used normally.