Three-layer structure polyethylene anti-corrosion layer bottom epoxy powder (3PE epoxy powder)

Product Features

The epoxy powder coating is the implementation of CSA Z245.21-2022 standard, which is the bottom design of the three-layer structure of polyethylene in buried steel-made pipe, using appropriate epoxy resin, curing agent, pigment, filler, etc., and can form a composite anticorrosion system with excellent performance with intermediate layer adhesive and outer polyethylene.

Application scope and characteristics

1.External anticorrosion of steel pipe and pipe fittings.

2.Compared with other forms of anti-corrosion, it has the characteristics of good adhesion, strong cathode disbondment, and collision and damage prevention.

3.It has the characteristics of mature process, wide application range, long anti-corrosion life, and wide operating temperature range (-40℃ ~80℃).

Method and dosage

1.Coating method: Electrostatic spraying.

Construction technology and repair technology references 

1. Remove oil, rust and other loose deposits and moisture on the surface of the steel pipe.
2. Sandblasting or shot blasting to Sa2.5 level, anchor pattern depth 40~110μm, surface dust removal to near white level, pay attention to adding new and old sand evenly to make the ratio stable.
3. Clean the dust and abrasives on the surface of the steel pipe.
4. The salt content on the steel pipe surface should not exceed 20mg/m².
5. The treated steel pipe should be protected from moisture and secondary pollution, and should be coated within 4 hours. If it exceeds 4 hours or rust or surface pollution occurs, it should be re-treated.
6. Workpiece preheating is generally controlled at 180~220°C , and must not exceed 275°C.
7. Apply the powder coating on the surface of the pipe, and adjust the temperature and spraying speed according to the thickness requirement and the gelling state of the surface.
8. Wrap the hot melt adhesive on the epoxy powder coating at a temperature similar to the melting point, then extrude the polyethylene surface layer and wrap it on the middle adhesive layer, and compact the three layers with a pressure roller to prevent interlayer bubble.
9. Coating cooling.
10. The repair shall be by epoxy primer / radiation cross-linked polyethylene thermal shrink belt (sets) or other methods selected by the design institute.

Qualification 

Powder coating properties

Coating performance

Test temperature

Safety, packaging, storage and transportation

1. This product is non-toxic, non-polluting and non-flammable, but measures should be taken to prevent large amounts of inhalation during operation.
2. Packing: Carton outer packing, lined with polyethylene bag, net weight 25±0.2kg.
3. Storage method: Store under dry, ventilated and clean conditions below 35°C, and keep away from fire and heating. After all packages are opened for use, the unused portion must be resealed to prevent moisture absorption from the air.
4. Warranty period: 12 months below 35°C.
5. Transportation: Avoid direct sunlight and rain. When the temperature is higher than 35°C, corresponding cooling measures should be taken.