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
WDE2896F is a modified BPA type epoxy resin
| 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 |
WDH2896F is a modified carboxylic anhdride liquid Hardener
| 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 |
Mechanical and physical properties
Tested system: Epoxy resin WDE2896F/Hardener WDH2896F=100/100/300
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.
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