Xiamen WangQin Chemical Technology Co., Ltd.
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The "wet-on-wet" coating process involves applying a subsequent coat directly over the preceding layer before it has fully dried. This method is implemented to enhance production efficiency, reduce energy consumption, and strengthen inter-coat adhesion. Successful implementation requires coating compatibility, optimal application intervals, and controlled environmental conditions.
The two-component (2K) epoxy system combining WL-AD203 with curing agent WL-AC046 meets all wet-on-wet process requirements. This formulation exhibits:
lRapid drying characteristics
lSuperior application flowability
lExcellent thixotropic properties
lExtended effective open time
Notably, WL-AC046 curing agent features a comparatively low active hydrogen equivalent. This property significantly reduces the required curing agent dosage versus alternative systems, resulting in measurable cost savings while maintaining performance standards.
| Item | Value |
| Appearance | milky white liquid |
| Non-Volatile content(%) | 53±2 |
| Viscosity(m Pa · s) | 500 ~ 8000 |
| Epoxy Value (Supply Form) (g/Eq) | 1010±50 |
| Item | Value | Testing Method |
| Appearance | Light yellow transparent liquid | Visual |
| Non-Volatile content(%) | 60±2 | GB/T 1725-2007 |
| Viscosity(m Pa · s) | 8000 ~ 18000 | GB/T 21059-2007 |
| Active hydrogen equivalent | 200 | ---- |
|
| WL-AC046 | Other1 | Other2 |
| Active hydrogen equivalent (supply form g/Eq) | 200 | 150 | 415 |
| 1kg WL-AD201 epoxy emulsion supporting curing agent dosage/g | 151.0 | 116.5 | 322.3 |
The active hydrogen equivalent of WL-AC046 is relatively low, and the overall cost of primer can be reduced by 20% compared with other similar products.
Surface drying can be achieved in 7-15 minutes above 5℃ and is suitable for "wet-on-wet" process
Salt spray resistance ≥ 500h
Pot-life at 35℃ > 5h
Comparison of anti-sagging performance with the same formula framework and viscosity
| With WL-AD201 epoxy emulsion | WL-AC046 | Other 1 | Other 2 | Other 3 |
| State when A.B is mixed | Slightly thickened | No change | Slightly thickened | Viscosity reduction |
| Surface drying time (Laboratory 150um wire rod scraping tinplate 26℃/50-55%RH with wind) | 10min | 15min | 15min | 20min |
| Anti-sagging (Control the same construction viscosity) | 175um | 125um | 150um | 75um |
