The painting process of Longchangjie Machinery's pre-polyurethane insulation pipes may vary depending on the specific product and production requirements. The painting process of pre-polyurethane insulation pipes mainly includes the following steps:
1. Pre-treatment of steel pipes: Rust removal, cleaning and drying of steel pipes are carried out to ensure that the surface is clean and free of impurities.
2. Primer treatment: Apply a layer of epoxy primer on the surface of the steel pipe. This primer helps enhance the adhesion between the polyurethane insulation layer and the steel pipe, and also improves the anti-corrosion effect.
3. Spraying anti-corrosion coating: Spray a layer of anti-corrosion coating on the surface of the steel pipe to extend its service life.
4. Preparation of insulation layer: After mixing polyurethane foam raw materials with catalysts, etc., it is sprayed or poured onto the surface of steel pipes through dedicated equipment to form an insulation layer.
5. Outer pipe preparation: Spray adhesive on the surface of the insulation layer, then put on a high-density polyethylene (HDPE) or fiberglass reinforced plastic outer pipe, and fix it with steel or plastic straps.
6. Curing treatment: Place the steel pipe with the outer casing on it into the curing room for heating and insulation to ensure the complete curing of the polyurethane foam.
7. Quality Inspection and Packaging: Conduct inspections on the appearance, size, insulation performance, etc. of the finished insulation pipes to ensure they meet the standards. Then, package them for storage and transportation.
