| Composition | It is made of modified epoxy resin, curing agent, pigment, filler
and other additives through processing. |
Main features | Good adhesive force, smooth coating and protection within large
temperature range; Long-term anti-corrosive effect, compact, hard and durable coating,
good impact resistance performance, flexibility and adhesion; Good anti-cathode disbanding capacity and good resistance to
chemicals, solvent, water, sewage and sea water. |
Application | It is applicable to the coating of crude oil pipelines, finished
oil pipelines, oilfield water injection pipelines, sewage
pipelines, inner wall of tap water pipelines, pipelines with
flanges, elbows, valves, pumps and other deformed parts. |
| Product series | Powders in different colors can be made according to customers’
requirements. |
Technical indexes | | |
| 1. Quality index of anti-corrosive epoxy powder paint |
| Appearance | Uniform gloss and no blocks. |
| Density g/m³ | 1.3-1.5 |
| Granularity distribution | 150μm, powder on sieve≤3.0,250μm, powder on sieve≤0.2 |
| Gel time (s) | 180℃≤180 200℃≤200 230℃≤60 |
| Content of nonvolatile matter % | ≥99.4 |
| Horizontal flowability | 22-28 |
| Content of magnetic material | ≤0.002 |
| 2. Quality index of anti-corrosive epoxy powder paint coatings |
| Appearance | Smooth surface, uniform gloss, no bubbles, cracks or shrinkage.
Slight orange peel is allowed. |
| Adhesive force (prying and stripping method) | 1-3 |
| Bend resistance 4° | The coating is free from cracks (ambient temperature) |
| Strength for impact resistance (J) | ≥11 |
| Abrasive resistance (1,000 h, 1,000 spins )mg | ≤20 |
| Film thickness μm | Common type: 350±50, the improved type: 500±50 |
| Cathodic disbanding (650℃ 48 h) mm | ≤8 |
| Salt spray test (1,000 h) | The film has no change. |
| Volume resistivity Ω.M | ≥1×1,013 |
| Electrical strength mv/m ≥30 | ≥30 |
| Curing condition | 180℃/10-15 min 205℃/8-10 min 230℃/5-7 min |
| Method of Application | It is applicable to high voltage electrostatic spraying |
Parameter of usage | 1. Technological process for powder paint External storage----- high temperature quick burning----- shot (or
sand) blasting treatment----- pre-heating pipelines ----- powder coating----- cooling----- inspecting----- additional
coating----- finished products 2. Internal spraying and coating procedure of pipeline (1) Getting rid of oil, rust, loose sediment, water, etc. (2) After treatment of blast cleaning or slot blasting, the surface
could reach Grade Sa 2.5 and the profile depth is 40-100μm. The
surface dedusting should reach near-white grade. The new or old sand should be added uniformly in order to keep the
proportion stable. (3) Clean the surface of pipelines. (4) Pre-heat work pieces, the temperature of which should be
controlled within 180-240℃ but does not exceed 260℃. (5) Coat the internal anti-corrosive powder paint on surface of
work pieces till the required thickness is reached. (6) Deal with curing according to requirements. (7) Cool coating. (8) Inspect surface when the temperature of work piece is lowered
to 95℃. (9) Additional coating of uncoated areas. |
