01
ST-SC433 Self-Cleaning Coatings
Uses
It is mainly applied to parts such as ship hull surfaces, propellers, propeller shafts, sonar compartments, and sea chests. It can also be used for surface protection of other marine facilities and marine transportation tools, such as offshore platforms, dock facilities, and cross-sea bridges. It plays an important role in preventing microbial corrosion and adhesion and fouling of marine organisms on ships and marine concrete buildings.
Performance indicators
|
Type |
ST-SC433 |
| Abrasion resistance test | Friction with steel wool, no change on the surface |
| UV aging test | 500 hours of UV lamp, with no surface changes |
| Acid resistance test | 350 hours, no change on the surface |
| Alkali resistance test | 350 hours, no change on the surface |
| Hardness | 9 H |
| Adhesion | Level 1 |
| Stain resistant | Level 1 |
| Water contact angle | ≥120° |
| Water rolling angle | ≤ 15° |
| Heat resistance test | 780 ℃ |
| Water resistance test | No blistering/peeling/no change in gloss color |
Construction process suggestions
Clean the base layer: Before the construction of the primer layer, conduct base layer inspection and acceptance. The surface should be flat, with distinct slopes and edges, no sharp foreign objects, no sanding, no peeling, no honeycomb pitting, no unevenness, and no rust and other defects. The surface of the base layer should be kept dry and there must be no visible water.
Special closed primer layer for polyurea: Spray, brush or roll to evenly apply the special closed primer on the surface of the base layer. (Construction of the primer layer is strictly prohibited if the surface of the base material is not completely treated.) The next step can be constructed only after it is completely dry. The construction interval should not exceed 24 hours.
Polyurea layer: Use hand brushing or spraying process for construction. Generally, it is carried out 2 hours after the primer construction is completed and before 24 hours. The construction thickness is about 0.5-1.5mm to ensure no missed coating, no accumulation, uniform construction, and one-time or multiple forming in place. (The thickness can be adjusted according to design requirements.)
Note: During the entire scraping process, be sure to repeatedly scrape forcefully using the cross method to avoid defect generation.