Material Epoxy Resin
In the power electronics industry, material epoxy resin is an essential casting compound that delivers superior insulation and structural stability, and selecting high-quality product is key to building durable power transformers and high-frequency electrical devices. This material epoxy resin blends epoxy resin with methyltetrahydrophthalic anhydride-modified curing agent and activated silica powder, resulting in a medium-viscosity formula with excellent penetration and adhesion to metal and ceramic substrates. The vacuum casting process for product is designed for precision, with a 1:1 mixing ratio and controlled temperature cycles producing a cured solid with a bending strength of 100-106 MPa and F-class insulation-critical for preventing electrical breakdown in transformers. Beyond its electrical performance, material epoxy resin offers outstanding heat dissipation and moisture resistance, ensuring long-term reliability in harsh industrial environments. Whether you're producing dry-type transformers or high-frequency inductors, product provides the consistency and performance to meet rigorous industry standards, making it a go-to option for electrical equipment manufacturers aiming for quality and safety.
Basic parameters of the product before mixing
|
Component |
Base Agent |
Curing Agent |
Referenced Standard |
|
Color |
Dark Green |
Grayish Brown |
Corresponding |
|
Viscosity @40℃ (mPa·s) |
4800–6500 |
3600–4900 |
GB/T 24148.4-2009 |
|
Density (g/mL) |
1.72–1.80 |
1.60–1.69 |
GB/T 6750-2007 |
Note: Colors can be customized according to customer requirements.
Traditional Vacuum Casting System Process
After all casting bodies are assembled and molded with release agent, place them in an oven at 80-100℃ for 5-8 hours.
Take materials according to a B:A ratio of 1:1 and place them in a constant temperature oven. Preheat the oven to 70℃ at room temperature (25℃) and hold for 2-3 hours.
Transfer the dried casting body to a casting tank with the tank temperature set to 70-75℃. Simultaneously, add the preheated material to the casting tank, setting the tank temperature to 60℃.
Set the material temperature in the mixing tank to 60℃. While stirring, simultaneously evacuate the vacuum to 50-150Pa. Observe through the sight glass that the material has completely degassed before casting.
Depending on the size of the casting body, control the casting time to 30-70 minutes. After casting, maintain the vacuum state for 30-40 minutes, then break the vacuum and apply 2 kg of pressure before removing the casting body from the tank.
Curing temperature profile
|
Stage |
Content |
Curing time (min) |
Curing temperature (°C) |
|
1 |
heating |
30 |
25~80 |
|
2 |
constant temperature |
360 |
80 |
|
3 |
heating |
15 |
80~100 |
|
4 |
constant temperature |
240 |
100 |
|
5 |
heating |
15 |
100~130 |
|
6 |
constant temperature |
360 |
130 |
Note: The curing temperature profile can be adjusted appropriately according to different product characteristics and requirements without affecting product performance.
Product Characteristics After Curing
|
Testing items |
Material: epoxy resin |
Reference Standards |
|
Tensile strength(MPa) |
55~63 |
GB/T 15022.2-2017 |
|
Tensile modulus of elasticity (MPa) |
7.60~8.60*10³ |
|
|
Bending strength (MPa) |
100~106 |
|
|
Flexural modulus (MPa) |
8.65~9.63*10³ |
|
|
Impact strength (KJ/m²)) |
49~59 |
|
|
Elongation at break (%) |
1.0~1.1 |
|
|
Compressive strength (MPa) |
156~165 |
|
|
Hardness (Shored) |
82~87 |
|
|
Volume resistivity (Ω·m) |
1015 |
|
|
Electrical strength (MV/m) |
28 |
Packaging Specifications
Insulation Class: F
Packaging Specifications: 25 KG
Shelf Life and Storage Conditions:
Shelf life: 180 days. After the shelf life, the product must pass inspection before use. Store in a well-ventilated, dry place, away from moisture and fire.
Precautions
1. Wear gloves and a mask during handling to avoid direct skin contact with the product.
2. If the product accidentally comes into contact with eyes, immediately rinse with clean, running water for 10 to 15 minutes. If severe discomfort occurs, seek medical attention immediately after rinsing.
3. If the product gets on the skin, wipe it off with a soft, clean paper towel or cloth, then wash with hand sanitizer.
4. If product vapors are inhaled and cause discomfort, immediately move outdoors. In severe cases, seek medical attention.
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