Epoxy Zinc Rich Primer

1. Product Composition:

The two-component anti-corrosion primer consists of epoxy resin, ultra-fine zinc powder, additives and polyamide curing agent.

II. Product Features:

(1) Excellent anti-corrosion and anti-rust properties; (2) Excellent adhesion, impact resistance and wear resistance; (3) Wide range of oil and solvent resistance; (4) Cathodic protection effect, the paint film does not affect welding and cutting.

III. Product Applications:

The anti-corrosion primer is applied to the port machinery, electric equipment, steel structure of factory and mine, large gas tank, buried pipeline, port, wharf, bridge, oil tank and petroleum pipeline.

IV. Technical Specifications:

5. Construction parameters:

The dry film thickness is 15-25um, one spray 13.6m2 /Kg. The dry film thickness is 30-40um, one spray 9.8m2 /Kg. The dry film thickness is 70-80um, one spray 4.5m2 /Kg.

The specific data depends on the spraying method, the thickness of the spray, the surface condition and the actual loss.

6. Reapplication interval:

7. Back-end support:

Epoxy ferrite intermediate paint, chlorinated rubber anticorrosive topcoat, aliphatic polyurethane topcoat.

8. Construction steps:

Step 1: Substrate preparation:

1. The steel surface should be cleaned of oil, dust, and loose oxide scale.

2. Surface treatment of base iron steel structures shall meet Sa2.5 grade through shot blasting or sandblasting; for structures unsuitable for sandblasting, manual treatment shall comply with St3 standards.

Note: ① Sa2.5 standard: The abrasive is fully sprayed to completely remove rust and oxide scale. After dust removal, the steel surface exhibits a near-white metallic luster with only minor surface imperfections.

② St3 grade standard: thoroughly remove loose rust and oxide scale with manual tools such as wire brushes and grinding wheels. After dust removal, the surface should exhibit a metallic luster.

Step 2: Painting process

Before painting, the paint slurry should be mixed uniformly. Then, according to the required amount for application, mix the paint slurry with the curing agent in a proper ratio. After 20 minutes of curing, the painting can be carried out.

The prepared paint should be used within 6 hours at 25℃.

High-pressure airless spraying was performed at 31-33 MPa using a Changjiang-brand 11B25 nozzle with a 50cm spray distance.

Coating interval (25℃): 3-5 days as pre-coating primer, 7-10 days as rust-proof primer. If the surface shows white zinc salt residue after prolonged exposure, it should be thoroughly cleaned before applying subsequent coatings. Recommended application: 2-3 coats (wet-on-wet), with 10-15 minute intervals between each coat.

9. Temperature restrictions for construction:

When the temperature drops below 5℃, switch to a fast-drying curing agent (winter type).

10. Painting method:

10.1 Precautions:

1. During construction, the mixer should be operated continuously to prevent zinc powder from settling.

2. Before applying the subsequent primer, the zinc-rich primer must be fully cured to ensure proper interlayer adhesion (typically requires 7 days for complete curing). In dry conditions, mist the area with water to maintain relative humidity between 40-70%.

Note: Complete curing is confirmed by pressing the zinc-rich primer surface with the edge of a coin and gently scraping. If a metallic sheen appears on the surface, the coating has been fully cured.

3. The paint film should not be too thick, generally not exceeding 40μm, as excessive thickness may prolong the recoating time.

4. When working at temperatures above 30°C, add 5-10% diluent to prevent dry spraying.

5. If the coating film is pulverized, all zinc salts must be removed before application.

6. Construction is not recommended in conditions of rain, fog, wind, or direct sunlight.

12. Storage, Transportation, and Shelf Life:

1. The product should be stored in a well-ventilated and dry place, and should be protected from direct sunlight. In summer, appropriate cooling measures should be taken when the temperature is too high.

2. During transportation, protect the product from rain and direct sunlight.

3. The product has a shelf life of 12 months. During storage, the packaging must remain unopened and meet storage conditions. After the expiration date, the product may be inspected according to the specified items in the product standards. If the results meet quality requirements, the product may still be used.

13. Safety and Environmental Protection Statement:

1. This product is flammable. Ensure proper ventilation and take necessary protective measures during application.

2. If the skin is stained with paint, wash it immediately with soap or other cleaning agents and plenty of water.

3. Discard of waste paint and packaging materials must comply with local environmental regulations.