Water-based graphene intermediate coat-Holy Hong Chemical (Dalian) Co., Ltd.

Water-based graphene intermediate coat

Waterborne Graphene Intermediate Coat

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I. Product Description

This product is composed of waterborne hyperbranched resin, nano-graphene, mica iron oxide, imported additives, and a specialized curing agent. The combined layered structure of nano-sized graphene and micron-sized mica iron oxide provides a synergistic micro-nano shielding mechanism, enhancing the coating’s overall performance—particularly its resistance to water penetration, impact resistance, and adhesion after immersion in water. As a result, the graphene-modified epoxy micaceous iron intermediate coat offers more effective and durable corrosion protection for steel structures operating in high-humidity and high-temperature environments. It can be used in combination with a variety of primer and topcoat systems. The resulting paint film is tough and exhibits excellent adhesion, flexibility, and abrasion resistance.

II. Recommended Uses

For the rust and corrosion protection of steel structural surfaces in environments ranging from mildly to severely corrosive, such as marine facilities including ships, containers, offshore platforms, and docks; petrochemical pipelines and storage tanks; as well as steel components in industries like metallurgy and power generation.

III. Physical Parameters

Project	Instructions
Color	Gray
Glossiness	Flat light
Volume solid content	42 ± 2% (varies depending on color)

	Drying time		Coating time
Temperature	Surface dry	Hard work	Minimum	Maximum
25℃	30 minutes	5 hours	12 hours	7 days

The above data were measured under conditions of a dry film thickness of 50 microns and a relative humidity of 40–60%. Higher coating film thickness, insufficient ventilation, high humidity, or lower temperatures will all extend the curing time.

4. Film Thickness and Coating Rate

Project	Instructions
Dry film thickness	50–75 micrometers
Theoretical coating rate	8.4 m²/L at 50 microns
Actual coating rate	Allow an appropriate loss coefficient.

V. Construction Reference

Project	Instructions
Mixing ratio	A (paint) : B (hardener) = 6:1 (refer to the product packaging label for specific ratios).
Air spraying	Recommended nozzle diameter: 1.5mm
Airless spraying	Recommended nozzle diameter: 0.38–0.48 mm; filter mesh size: 60 mesh.
Brush coating application	Suitable for pre-coating and small-area repairs
Roller application construction	Suitable for small-area repairs; using a short-nap roller can achieve a better finish.
Diluent	Clean tap water (add after thoroughly mixing components A and B)
Dilution ratio	For airless spraying, brush coating, or roller coating: 0–10%; for air spraying: 5–15%.
Time can be made.	At 25℃, it lasts for 4 hours; as the temperature increases, the duration shortens.
Cleaning equipment	Immediately after use, clean the equipment with clean water. It is also recommended to periodically flush the spraying equipment during the construction process.
Work pause	Do not leave paint in the paint tube, spray gun, or spraying equipment. Thoroughly rinse the equipment with clean water.

6. Surface Treatment

Oil and grease shall be solvent-cleaned according to the SSPC-SP1 standard, sandblasted to Sa2.5 grade or derusted with power tools to St3 grade, achieving a surface roughness of 40–70 microns, and ensuring that the surface remains clean and dry.

Due to the nature of water-based coatings, they tend to flow away from sharp edges and corners, creating a “corner effect.” To protect these edges and corners from corrosion, it is necessary to smooth them down and apply a primer coat beforehand.

Before construction begins, all surfaces must be assessed and prepared in accordance with ISO 8504. When applying water-based coatings, it is crucial to strictly adhere to all cleanliness standards.

VII. Precautions

During construction and drying, the ambient temperature should ideally be above 10℃ with relative humidity below 80%. The substrate temperature should be at least 3℃ higher than the dew point, and adequate ventilation must be ensured. Avoid outdoor construction during nights when temperatures are low, especially in seasons characterized by condensation or rainfall.

Post-coating: waterborne polyurethane, waterborne acrylic paint, etc.; solvent-based coatings can also be applied, but the minimum recoating interval must be extended, and compatibility tests must be conducted on-site. For specific matching recommendations, please consult Holy Hong’s sales engineers.

The durability of water-based paints largely depends on proper application. For instance, sharp edges, rivets, and areas with skip welding require extra care during application to avoid excessively thick paint films with each coat—ideally, an additional touch-up coat is recommended. Like all epoxy systems, this product may experience chalking and discoloration when exposed to outdoor conditions. Therefore, when a durable decorative finish with excellent gloss retention and color fastness is required, it’s advisable to apply the recommended topcoat for re-coating.

Preparation and Cleaning Steps for Construction Equipment:
To prevent water-based coatings from being contaminated by solvents, the spraying equipment must be thoroughly cleaned before use. All equipment that comes into contact with solvents—such as pumps, pipes, and guns—must be completely cleaned according to the steps outlined below:

Before spraying: Circulate and flush the equipment and pipelines with the original solvent-based paint thinner, then use Holy Hong thinner, and finally rinse with clean fresh water.

If the construction equipment is made of stainless steel and is specifically designed for applying water-based coatings, this preparation and cleaning work is not required.

8. Storage and Warranty

During storage and transportation, always take care to protect the product from freezing. The recommended storage temperature is between 4°C and 25°C. Store sealed in a cool place, with a shelf life of 12 months.

9. Health and Safety:

Since the paint liquid is not harmless, effective measures should still be taken to prevent skin and eye contact with the coating (such as wearing work clothes, gloves, goggles, face masks, and protective oils). If the product accidentally comes into contact with the skin, thoroughly wash it off with warm water and soap or an appropriate industrial cleaner. If the eyes are contaminated, rinse them with clean water for at least 10 minutes and seek medical attention immediately. It is recommended to wear a respirator with proper ventilation to avoid inhaling paint mist and harmful volatile substances, especially when working in poorly ventilated environments. Disposal of paint waste must comply with national and local regulations.

Statement:

The above information and data are based on laboratory tests and practical experience. Due to individual circumstances (such as construction techniques, testing methods, or improvements in coatings), the data may vary. We reserve the right to modify this instruction manual without prior notice.

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