Bonding Powder for Electronic Iron Powder Cores

Surface Finish Options Overview

Product Introduction:
This product is a thermosetting epoxy-modified bonding powder, formulated using special epoxy resin and functional curing agents. It features high reactivity, strong adhesion, high cross-link density, and excellent resistance to chemicals, solvents, as well as superior flexibility and impact resistance. The product offers outstanding physical, mechanical, and chemical properties. During the curing process, it has minimal shrinkage, resulting in a smooth and dense surface on the molded powder core. This overcomes the defects of polyethylene-based binders, and its superior characteristics determine the quality of the iron powder core.

Product Usage:
Special bonding agent for molding electronic soft magnetic iron powder cores.

Product Features:

High mechanical strength: The surface of the molded components is smooth and dense. After curing, it has excellent adhesion to various metal powders, strong rigidity, good mechanical properties, and a high pass rate for finished products.Low shrinkage of the cured product: The cured product has excellent dimensional stability, reducing precision errors caused by shrinkage stress during the curing process.Excellent processing performance: It has good dispersibility and lubricity with metal powders, reducing friction between powders and molds during molding. The surface precision of the molded iron powder core is high, suitable for assembly line production.Excellent electrical properties: The cured product has a very high glass transition temperature and a wide operating temperature range, maintaining optimal stable electrical properties between -65°C and 110°C.Good dielectric properties: The cured components have excellent chemical and solvent resistance, withstanding organic chemical corrosion.Energy-saving and environmentally friendly: The curing temperature is low and fast. It can be cured using the baking temperature of external painting or powder coating, saving energy. It is a 100% solid component with no harmful substances and is an environmentally friendly product promoted by the state.

Powder Performance:

Property	Specification	Notes
Mechanical Strength	High	Ensures durability and resistance to mechanical stress
Shrinkage	Low	Minimizes dimensional changes during curing, maintaining precision
Processing Performance	Excellent dispersibility and lubricity	Facilitates smooth molding and reduces wear on molds
Electrical Properties	High glass transition temperature, wide operating temperature range	Ensures stable performance across a broad temperature spectrum
Dielectric Properties	Excellent chemical and solvent resistance	Protects against degradation from chemical exposure
Environmental Performance	100% solid content, no harmful substances	Complies with environmental regulations and promotes sustainability

Curing Conditions:

Property	Specification	Notes
Temperature	Referenced to workpiece temperature	Deviations may affect performance; ensure accurate temperature control for optimal results

Addition Rate:
15-30% of the total metal powder volume, or adjusted according to the type and requirements of the component. No additional lubricants are needed when using this product.

Application Method:

Add the powder to the mixer according to the formula requirements, mix it with other components, and then proceed with molding.After molding, the components can be placed in an oven for curing. The recommended curing temperature refers to the surface temperature of the component. Deviations in temperature may affect the bonding strength.

Health and Safety:

Property	Specification	Notes
Toxicity	Non-toxic	Safe for handling and application
Flammability	Non-flammable	Reduces risk in storage and use
Regulation	GB15607-1995	Follow safety protocols for coating operations

Precautions:

Item	Specification	Notes
Storage	Ventilated, dry, below 27°C, away from heat sources, corrosive chemicals, and solvents, avoid strong light, maximum stack height 5 layers, avoid long-term pressure, keep packaging sealed	Ensures product stability and prevents degradation
Storage Period	Best within 3 months at 27°C, validate performance if used beyond this period	Maintains optim

FAQ

1. What is Powder Coating?

Powder coating is a dry finishing process used to apply a protective and decorative coating on metal or other surfaces. Instead of using liquid paint, fine powder particles (usually made of polyester, epoxy, or hybrid resins) are electrostatically charged and sprayed onto a conductive surface. The coated object is then baked in an oven, where the powder melts, flows, and cures into a smooth, durable finish.

Key features:

Durable, hard finish

Resistant to scratches, corrosion, and UV

Environmentally friendly (no VOCs)

2. Benefits of Powder Coating

Powder coating offers several advantages over traditional liquid painting:

Durability: Resistant to chipping, scratching, fading, and wear.

Corrosion Protection: Provides excellent protection against rust and chemicals.

Environmentally Friendly: No volatile organic compounds (VOCs) and minimal waste.

Efficiency: Overspray can be collected and reused, up to 99% material utilization.

Uniform Finish: Smooth, even coating without runs or drips.

Cost-Effective: Single-coat systems can achieve high film thickness, reducing labor and energy.

Aesthetic Variety: Wide range of colors, textures, and effects.

3. What Temperature to Cure Powder Coating

The curing temperature depends on the type of powder used:

Epoxy powder: ~160–200°C (320–392°F)

Polyester powder: ~180–210°C (356–410°F)

Hybrid (Epoxy-Polyester) powder: ~180–200°C (356–392°F)

Typical curing time: 10–20 minutes depending on thickness and oven type.

Always follow the powder manufacturer’s specifications for best results.

4. Process for Powder Coating

The powder coating process usually follows these steps:

Surface Preparation:

Clean the surface thoroughly (remove oil, grease, rust, or dirt)

Methods: chemical cleaning, sandblasting, or phosphating

Pre-Treatment:

Apply a conversion coating or primer if needed to improve adhesion

Powder Application:

Spray the powder using an electrostatic spray gun or fluidized bed

Curing:

Bake the coated object in an oven at the recommended temperature for the powder type

The powder melts and forms a continuous, smooth film

Cooling & Inspection:

Let the coated item cool

Inspect for defects, uniform coverage, and desired thickness

5. How to Spray Powder Coat

Equipment Needed:

Electrostatic spray gun

Compressed air supply

Powder feed hopper or container

Grounding of the object

Steps:

Ground the object: Ensures the charged powder is attracted to the surface.

Spray evenly: Hold the gun 6–12 inches from the surface, moving in smooth, overlapping strokes.

Apply sufficient powder: Ensure full coverage without excessive buildup.

Cure immediately: Transfer the sprayed item to the curing oven to fuse the powder into a solid coating.

Tips:

Maintain consistent speed and distance while spraying.

Use proper ventilation to reduce airborne powder accumulation.

Test a small area to check film thickness and color before full application.