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Water-based Epoxy Base Coat

    Water-based Epoxy Base Coat

    1. Technical indicators**Drying time (25℃)** | Surface drying ≤ 1 hour, actual drying ≤ 24 hours | Environmental humidity and temperature will affect the drying speed | | **Adhesion (crosshatch method)**| ≤Level 1 (according to GB/T 9286 standard) | Ensure strong bonding between coating and substrate | | **Salt spray resistance** | ≥500 hours (no rust, no blistering) | Suitable for anti-corrosion of metal substrates | |**Water resistance (soaking)** | ≥168 hours (no blistering, no shedding) | Suitable for humid environments | |**Environmental protection** | VOC content ≤50g/L (in lin...
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1. Technical indicators

**Drying time (25℃)** | Surface drying ≤ 1 hour, actual drying ≤ 24 hours | Environmental humidity and temperature will affect the drying speed | |

 **Adhesion (crosshatch method)**| ≤Level 1 (according to GB/T 9286 standard) | Ensure strong bonding between coating and substrate | |

 **Salt spray resistance** | ≥500 hours (no rust, no blistering) | Suitable for anti-corrosion of metal substrates | |

**Water resistance (soaking)** | ≥168 hours (no blistering, no shedding) | Suitable for humid environments | |

**Environmental protection** | VOC content ≤50g/L (in line with national standard GB/T 23986-2009) | Low VOC, meeting environmental protection requirements |

2. Construction precautions** ####

**1. Substrate treatment** - **Cleaning**: The surface of the substrate must be free of oil, dust, rust, loose objects, etc. The metal surface needs to be sandblasted or polished to Sa2.5 level; the concrete surface needs to be dry (moisture content ≤10%) and free of floating ash. 

2.- **Flatness**: Uneven substrates need to be filled or polished to avoid affecting the uniformity of the coating. ####

3. Construction environment** - **Temperature and Humidity**: The optimal construction temperature is 5~35℃, and the relative humidity is ≤85%. Avoid construction in rainy days, low temperature (<5℃) or="" high="" temperature="">40℃). -

4. **Ventilation**: Maintain good ventilation to speed up drying and reduce the accumulation of harmful gases. #### **

5. Coating preparation** - **Mixing ratio**: Strictly follow the product instructions to mix the main agent and curing agent in proportion (such as 1:1 or 2:1), and the stirring time is ≥ 3 minutes. -

6. **Maturation time**: After mixing, let it sit for 5 to 10 minutes (refer to the product description for details) before use to ensure sufficient reaction. -

7. **Dilution**: If dilution is needed, use deionized water or purified water, and the amount added is ≤5% (excessive dilution will affect performance). #### *

8. - **Coating amount**: It is generally recommended that the dry film thickness is 50~80μm, and the theoretical dosage is 0.12~0.15kg/m² (adjusted according to the roughness of the substrate). -

9. **Recoating interval**: Apply the next coat after it is completely dry (about 24 hours). Do not overcoat until it is completely dry.

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1. What is Water-based Epoxy Primer?

A Water-based Epoxy Primer is a type of coating designed to prepare and enhance the adhesion of surface materials before applying a finishing topcoat. Unlike traditional solvent-based primers, water-based epoxy primers use water as the primary solvent, making them a more environmentally friendly and safer option. These primers are formulated with epoxy resins, which are known for their strong bonding properties, exceptional durability, and resistance to wear and corrosion. The water-based formula significantly reduces harmful volatile organic compounds (VOCs), making it an ideal choice for both indoor and outdoor applications.

Water-based epoxy primers are typically used on concrete, steel, aluminum, wood, and other materials to provide an effective bonding surface for topcoats, which helps ensure a longer-lasting and more durable finish. They are highly valued for their ability to improve the performance of paint systems, increase the longevity of coatings, and enhance the overall appearance of surfaces.

2. Key Features of Water-based Epoxy Primer

Water-based epoxy primers offer several distinctive features that make them suitable for a wide variety of applications. These include:

2.1 Environmentally Friendly

One of the standout benefits of water-based epoxy primers is their low environmental impact. Unlike traditional solvent-based primers, which release high levels of VOCs (volatile organic compounds), water-based formulations are free of harmful chemicals, making them safer for both the environment and the user. This makes them an ideal choice for green building projects, commercial spaces, and residential applications where sustainability is a priority.

2.2 Excellent Adhesion

Water-based epoxy primers provide superior adhesion to a wide range of substrates, including concrete, metal, wood, and plastics. The epoxy resin component in the primer forms a strong chemical bond with the surface, ensuring that the topcoat adheres well and lasts longer. This makes them particularly effective for priming surfaces that are prone to corrosion or require extra bonding strength, such as metal structures, floors, and machinery.

2.3 Enhanced Durability and Protection

When applied as part of a coating system, water-based epoxy primers offer excellent durability and protection. They are resistant to moisture, abrasion, and chemicals, which makes them ideal for high-traffic areas or harsh industrial environments. These primers also provide an effective barrier against rust and corrosion on metal surfaces, significantly extending the lifespan of the coated substrate.

2.4 Quick Drying and Low Odor

Water-based epoxy primers tend to dry faster than solvent-based primers, allowing for quicker turnaround times during painting projects. They also produce less odor, which is beneficial for indoor use, especially in areas with limited ventilation. The low odor also makes them a preferred option in residential spaces, schools, hospitals, and other public areas where air quality is a concern.

2.5 Good Color Retention

Water-based epoxy primers provide a smooth, even surface that improves the appearance of the final topcoat. They are also effective in preventing the discoloration or yellowing of the surface over time. As a result, they help maintain the aesthetic quality of the finished product, especially in applications where the color of the final paint finish is crucial.

2.6 Corrosion Resistance

For industrial and commercial environments where metal surfaces are exposed to moisture, humidity, or harsh chemicals, corrosion resistance is an essential feature. Water-based epoxy primers provide excellent protection against rust and corrosion by forming a strong bond with the substrate and creating a barrier that shields the surface from damaging elements.

3. Applications of Water-based Epoxy Primer

Water-based epoxy primers are versatile and can be used in various industries and applications. Below are some common use cases:

3.1 Concrete and Masonry Surfaces

Water-based epoxy primers are highly effective for use on concrete floors, walls, and other masonry surfaces. Concrete is porous by nature, which means it can absorb moisture and chemicals, leading to damage over time. A water-based epoxy primer forms a protective layer on the surface, preventing water and contaminants from penetrating the concrete and extending the lifespan of the coating.

Concrete floors in warehouses, garages, factories, and high-traffic areas can be effectively primed with water-based epoxy to enhance the adhesion and durability of subsequent topcoats, such as epoxy or polyurethane finishes.

3.2 Metal Surfaces

Water-based epoxy primers are widely used for priming metal surfaces, especially in industries such as automotive, aerospace, and marine. Metal substrates are prone to rust and corrosion when exposed to moisture or chemicals, but water-based epoxy primers offer strong corrosion resistance. These primers can be applied to steel, aluminum, and galvanized surfaces to prevent rust formation and provide a smooth, even base for the topcoat.

For example, metal surfaces on industrial equipment, vehicles, or machinery can benefit from the added protection and adhesion provided by water-based epoxy primers.

3.3 Wood and Timber

Water-based epoxy primers can also be applied to wood surfaces to improve adhesion and prevent moisture damage. Wood is susceptible to rot and degradation when exposed to humidity, so applying an epoxy primer creates a protective layer that seals the wood, preventing moisture penetration and increasing the longevity of the topcoat.

This is particularly useful in applications such as decking, furniture, and structural wood in outdoor environments, where moisture resistance is essential.

3.4 Marine and Offshore Applications

Water-based epoxy primers are increasingly used in marine and offshore industries to protect boats, ships, and other structures exposed to seawater. These primers provide excellent resistance to saltwater, UV rays, and environmental elements, helping to prevent rust and corrosion while improving the adhesion of anti-fouling paints and topcoats.

3.5 Industrial and Commercial Facilities

In industrial facilities, water-based epoxy primers are used for priming large equipment, machinery, tanks, and pipes. These primers help prevent rust and corrosion, improving the efficiency and performance of industrial operations. They are also used to prepare surfaces in commercial spaces such as retail stores, warehouses, and garages.

4. Advantages and Disadvantages of Water-based Epoxy Primer

4.1 Advantages

  • Environmental Friendliness: Water-based epoxy primers have low VOC content, making them safer for the environment and the health of workers.

  • Fast Drying: These primers dry faster than solvent-based products, allowing for quicker project completion.

  • Low Odor: The low odor of water-based epoxy primers makes them more suitable for indoor applications where ventilation is limited.

  • Durability and Protection: Water-based epoxy primers offer excellent resistance to corrosion, moisture, and abrasion, increasing the longevity of the finished coating.

  • Easy Cleanup: Being water-based, these primers are easier to clean up with just soap and water, reducing the need for harsh chemicals or solvents.

4.2 Disadvantages

  • Lower Temperature Sensitivity: Water-based epoxy primers may not perform as well in extremely cold temperatures, as the drying time may increase, or the coating may not cure properly.

  • Surface Preparation: Proper surface preparation is critical to the performance of the primer. Any existing dirt, rust, or oil must be removed before application for the best results.

  • Limited Chemical Resistance (in some cases): While water-based epoxy primers offer good resistance to many chemicals, certain harsh chemicals may require a more robust primer system.

5. Application Process for Water-based Epoxy Primer

The application of water-based epoxy primers follows several key steps to ensure optimal results:

5.1 Surface Preparation

Surface preparation is crucial for ensuring good adhesion between the primer and the substrate. Surfaces should be clean, dry, and free of contaminants like dust, grease, or rust. For concrete surfaces, it may be necessary to grind or sand the surface to open up the pores and promote better bonding. Metal surfaces may require sanding or abrasive blasting to remove rust and oxidation.

5.2 Mixing the Primer

Some water-based epoxy primers require mixing before use. Follow the manufacturer’s instructions for mixing the primer and hardener, if applicable. Properly mixed primer ensures the best performance and durability.

5.3 Application

The primer can be applied using brushes, rollers, or spray equipment. A smooth, even coat should be applied to ensure the best adhesion for the topcoat. Multiple coats may be necessary for certain substrates, especially concrete, which may require a more porous surface treatment.

5.4 Drying and Curing

After application, allow the primer to dry and cure as per the manufacturer's instructions. Drying times may vary based on temperature and humidity, so it is essential to allow sufficient time for the primer to set before applying the topcoat.

5.5 Topcoat Application

Once the water-based epoxy primer has cured, you can apply the desired topcoat, such as epoxy, polyurethane, or acrylic finishes. The primer helps ensure that the topcoat adheres well and performs optimally over time.

6. Conclusion

Water-based epoxy primers offer a versatile, environmentally friendly solution for improving the performance and durability of coatings on a wide range of substrates. Whether used on concrete, metal, wood, or masonry, these primers provide excellent adhesion, corrosion resistance, and long-lasting protection, making them ideal for both industrial and residential applications. By reducing the environmental impact and offering quick drying times, water-based epoxy primers provide a practical and sustainable choice for a variety of painting and coating projects.



Related tags： Water-based Epoxy Primer Water-based Epoxy Topcoat Water-based Epoxy Base Coat
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