If you’ve ever tried getting a water-based PSA to stick to wet film, metal, or PVC, you know how frustrating it is. Most formulations lose tack the second moisture shows up. And if you're working in marine, outdoor, or high-humidity conditions, your adhesive options shrink fast unless you want to go solvent-based, which opens up another set of problems.
Core Challenges for Underwater PSA
- Water Displacement: Adhesive must displace water from substrate surface
- Hydrolytic Stability: Polymer backbone must resist water-induced degradation
- Cohesive Integrity: Maintaining internal strength when saturated
- Substrate Wetting: Achieving contact despite water presence
- Long-term Durability: Resisting swelling, softening, and failure
So we built a solution that works without compromise. A film-grade, water-based PSA that holds on even when submerged, without losing peel, tack, or holding strength.
This isn’t theoretical. It’s a working, production-ready formulation that’s already been tested on wet PE, PVC, and metal. Let’s dive straight into the numbers:
Ready-to-Use Film-Grade WB PSA for Underwater Application
Component | % by Weight (as supplied) | Purpose |
Acronal® V275 (BASF) | 60.0 | Acrylic PSA polymer dispersion (Tg ≈ -20 °C) |
Tacolyn® 1070 (Eastman) | 25.0 | Rosin ester tackifier dispersion |
Zirconium Ammonium Carbonate (ZAC) (Borchers ZC 5400) | 1.2 | External crosslinker for water resistance |
Silquest A-187 (Momentive) | 0.8 | Silane adhesion promoter (glycidoxy silane) |
BYK®-024 (BYK Additives) | 0.2 | Defoamer |
Acrysol™ RM-2020 NPR (Dow) | 1.0 | HEUR-based rheology modifier |
Propylene Glycol | 2.5 | Freeze-thaw stability & coalescence aid |
Kathon™ LX 1.5 (Rohm and Haas / Dow) | 0.1 | Biocide |
DI Water | 9.2 | Balance to 100% |
Key Specifications of the Final Adhesive
· Solids content: ~52–55%
· Viscosity (Brookfield, RVT, 5rpm, 25°C): 8,000–12,000 cP
· pH: 7.5–8.2
· Appearance: Off-white to translucent viscous liquid
· Film: Clear, tacky, water-resistant
Performance (on Wet Substrates)
· Peel adhesion (wet PVC): ≥ 2.8 N/25mm
· Loop tack (on wet HDPE): Excellent (tack retention ≥ 80% vs dry)
· Holding power (1kg @ 23°C): ≥ 24 hours
· Water immersion @ 24 hours: No cohesive failure
· Temperature resistance: Up to 70°C (short term)
Production & Application Notes
· Mixing protocol:
1. Start with base polymer (Acronal® V275).
2. Slowly add tackifier dispersion under moderate stirring.
3. Incorporate ZAC crosslinker, silane, and propylene glycol sequentially.
4. Add rheology modifier and defoamer under low shear.
5. Adjust final viscosity with DI water.
6. Add biocide at the end below 30 °C.
· Coating method: Knife, roll, or slot-die coating onto PET or PE film.
· Drying: 90–105°C for 1–2 minutes.
· Lamination: Immediate or after 24h aging (preferred for water resistance buildup).
Formulation Cost Calculation (Per 100 Kg)
Component | Usage (kg) | Unit Cost (USD/kg) | Subtotal (USD) |
Acronal® V275 | 60.0 | 2.80 | 168.00 |
Tacolyn® 1070 | 25.0 | 3.60 | 90.00 |
ZAC | 1.2 | 7.50 | 9.00 |
Silquest A-187 | 0.8 | 11.00 | 8.80 |
BYK®-024 | 0.2 | 8.00 | 1.60 |
Acrysol RM-2020 NPR | 1.0 | 9.50 | 9.50 |
Propylene Glycol | 2.5 | 1.80 | 4.50 |
Kathon LX 1.5 | 0.1 | 25.00 | 2.50 |
DI Water | 9.2 | 0.02 | 0.18 |
Total (Raw Material) | 100.0 | 293.08 USD |
➕ Estimated Conversion Cost: ~15 USD/100 kg (includes emulsification, filtration, packaging)
Total Cost per kg (Ex-Plant) = $3.08/kg
Suggested Ex-Works Price (10–15% markup) = $3.40–3.55/kg
Best of all, it's solvent-free, REACH-compliant, and made with industrially available ingredients at a cost-effective ~$3.08/kg ex-plant.
For manufacturers looking to differentiate in waterproof patching, marine tapes, or wet-surface label applications, this water-based PSA delivers performance without compromising on safety or sustainability.
