Two-Component Waterborne Grey Epoxy Primer
Based on Beckopox™ EP 2351w/58WA & Beckocure® EH 2250w/41WA
REC25005 is a starting-point formulation for a two-component (2K), water-reducible grey epoxy primer. It pairs the allnex Beckopox™ EP 2351w/58WA waterborne epoxy resin with the Beckocure® EH 2250w/41WA amine hardener to deliver a low-VOC, anticorrosive primer for industrial steel protection.
- ~65%Solids A+B
- ~99VOC g/L
- ~32%PVC
- 4.9 : 1A : B ratio
- ~1 hPot life
Formulation
| Raw material | Weight | Function | Supplier |
|---|---|---|---|
| Part A-I | |||
| Deionized water | 11.88 | – | – |
| Additol® VXW 6208/60 | 2.27 | Dispersing additive | allnex |
| Additol® VXW 6393 | 0.46 | Defoamer | allnex |
| Part A-II | |||
| Microtalc IT extra | 5.99 | Filler | Elementis |
| Kronos 2190 | 22.52 | Pigment | Kronos |
| Plastorit 0000 | 7.02 | Filler | Imerys |
| Bayferrox 3920 | 0.28 | Pigment | Lanxess |
| Bayferrox 306 | 0.85 | Pigment | Lanxess |
| Baryt EWO | 4.87 | Filler | Deutsche Baryt Industrie |
| Heucophos ZPO | 4.87 | Anti-corrosion | Heubach |
| Part A-III | |||
| Texanol Ester Alcohol | 0.90 | Coalescent solvent | Eastman |
| Additol® VXW 6393 | 0.10 | Defoamer | allnex |
| Additol® VXW 6503 N | 0.34 | Substrate wetting additive | allnex |
| Additol® VXW 6388 | 0.90 | Rheology control | allnex |
| Part A-IV | |||
| Beckopox™ EP 2351w/58WA | 36.75 | Epoxy resin | allnex |
| Total Part A | 100.00 | ||
| Part B | |||
| Beckocure® EH 2250w/41WA | 20.58 | Amine hardener | allnex |
Reference: IB 772/6. Mixing ratio is Part A : Part B = approx. 4.9 : 1 by weight. Combine the two components only shortly before application.
Processing
- Prepare and homogenize the mill base (Part A-I and A-II) Mix all components of Part A-I in the mentioned order. Add the components of Part A-II in the mentioned order and homogenize for 3–10 minutes.
- Grind the mill base Grind on a bead mill for approx. 30 minutes.
- Add additives and resin to complete Part A (Part A-III and A-IV) Add step by step Part A-III, then complete with Part A-IV (Beckopox™ EP 2351w/58WA).
- Combine the two components and adjust Mix Part A and Part B (Beckocure® EH 2250w/41WA) shortly before application and adjust to the required viscosity with deionized water.
Calculated parameters
- Mixing ratio Part A : Part B
- approx. 4.9 : 1
- Amine : epoxy crosslink ratio
- approx. 80 %
- Pigment : binder ratio
- approx. 1.55 : 1
- Pigment volume concentration (PVC)
- approx. 32 %
- Solids content Part A
- approx. 70 %
- Solids content Part A + Part B
- approx. 65 %
- VOC content Part A + Part B (excluding water)
- approx. 99 g/l
Measured parameters
- Pot life
- approx. 1 hour