Product name: Polyurethane Topcoat
Product introduction
Polyurethane topcoat is a two-component topcoat with excellent weatherability and color retention. There is no maximum recoating interval. It has fast drying, excellent adhesion, excellent weather resistance, seawater resistance, acid and alkali resistance, and abrasion resistance properties.
Application
Polyurethane topcoat can be cured at low temperature. It is widely used for anti-corrosion of iron towers, bridges, highway guardrails, high-grade metal structure buildings, outdoor facilities, petroleum equipment and storage tank pipelines.
Product picture
 |  |
| Front | Back |
Application areas
 |  |  |  |
| Substations | Substations | Transmission line | Transmission line |
Construction technology
1. Basic treatment
Clean up the rust, weld coating, welding spatter, oil stain, dust and other debris on the coating part, so that the coated surface is free of rust, oil, water, and dust. Primer must be applied within 12 hours after rust removal.
2. Primer coating
When the primer is applied, the direction should be consistent and the connection should be neat. When painting, the principle of frequent movement and short distance is adopted to prevent too much paint from flowing down.
3. Topcoat coating
Prepare according to the ratio of A:B=10:1 and stir thoroughly to ensure consistent color, viscosity and consistency without sagging and brush lines. It should be stirred continuously during use, and the application method is the same as that of the primer.
Recommended solutions to increase service life
1.Cost-effective solution for normal and low-pollution environment
Epoxy Iron Red Primer + Polyurethane topcoat
2.Cost-effective solution for moderately polluted environment
Epoxy zinc rich primer + Polyurethane topcoat
3.Cost-effective solution for heavily polluted environment
Epoxy zinc rich primer + Epoxy MIO micaceous iron oxide intermediate coat + Polyurethane topcoat
Technical data sheet
No. | Test Items | Technical Requirements | Measured Values |
1 | Non-volatile content | ≥40 | 69 |
2 | Gloss 60° | —— | 89 |
3 | Pencil hardness (scratch) | ≥F | H |
4 | Impact resistance, cm | 50 | 50 |
5 | Bend test, mm | 2 | 2 |
6 | Cross-cut test, grade | ≤1 | 1 |
7 | Adhesion, MPa | ≥4 | 7 |
8 | 168h acid resistance（50g/L H₂SO₄） | No abnormality | No abnormality |
9 | 168h alkali resistance（20g/L NaOH） | No abnormality | No abnormality |
10 | 1000h salt fog resistance | No blistering、no rust、no falling off | Qualified |
11 | 1000h resistance to artificial weathering | No blistering, no rust, no cracking, no falling off, pulverization ≤ grade 2 | No blistering, no rust, no falling off, no cracking, pulverization ≤ grade 2, discoloration grade 0, Loss of light level 2 |
12 | Fineness, μm | ≤40 | 20 |
13 | Viscosity, s | —— | 90 |
14 | Dry film thickness, μm | —— | 74.6 |
