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Q1. What is excimer resin (excimer UV resin)?
Excimer resin is a UV-curable resin that creates a soft, skin-like (soft-touch) matte finish. After the coating is applied and exposed to excimer light at specific wavelengths (e.g. 172 nm, 222 nm or 254 nm), the coating surface micro-wrinkles to form a fine, uniform texture — the “skin-feel” effect. “Excimer” refers to the excimer (excited-dimer) UV lamps used in this process.
Q2. What is the application process for excimer resin?
The resin is used as the main binder to formulate a coating. The coating can be applied by curtain coating, roller coating, spray coating, dip coating or printing.
Example — coated application (5 steps): (1) apply the coating; (2) expose to a 395 nm LED lamp to initiate the initial texture reaction; (3) expose to a 254 nm excimer lamp for 3–5 s to form and fix the soft-touch effect; (4) full UV curing at 200–400 mJ/cm² to completely cure the film; (5) final inspection.
Q3. Does Lencolo offer dual-cure excimer resin? What is its process?
Yes. Coatings made with Lencolo dual-cure excimer resin can be applied by curtain, roller, spray, dip or printing.
Example — spray application (7 steps): (1) spray; (2) leveling bake at 65 °C for 3–5 min; (3) expose to a 395 nm LED lamp to initiate the initial texture reaction; (4) expose to a 254 nm excimer lamp for 3–5 s to form and fix the soft-touch effect; (5) full UV curing at 200–400 mJ/cm²; (6) post-bake at 80 °C for 2 h; (7) final inspection.
Q4. Is there a reference formulation? (roller coating — Lencolo L-6367-1, 254 nm line)
Taking Lencolo excimer resin L-6367-1 as an example, here is a roller coating formulation, which mainly includes the main excimer resin, UV monomer, photoinitiator, matting powder, and other materials.
| Component (parts by weight) | Parts |
|---|---|
| Lencolo L-6367-1 (main excimer resin) | 62 |
| HDDA (difunctional monomer) | 8 |
| EO9-TM (ethoxylated TMPTA monomer) | 18 |
| BP (benzophenone, photoinitiator) | 5 |
| 184 (photoinitiator) | 1.8 |
| TPO (photoinitiator) | 0.2 |
| Matting powder | 5 |
| Total | 100 |
Q5. Is there a reference formulation for spray-applied excimer resin? (Lencolo L-6367-2)
Lencolo excimer resin L-6367-2 as an example, here is a formulation for spray coating, which mainly includes the main excimer resin, two auxiliary resins, photoinitiator, leveling agent, matting powder, diluent, and other materials.
| Component (parts by weight) | Parts |
|---|---|
| Lencolo L-6367-2 (main excimer resin) | 47.2 |
| Lencolo L-6605 (auxiliary resin) | 7 |
| Lencolo L-6129 (auxiliary resin) | 10 |
| Photoinitiator TPO | 0.15 |
| Photoinitiator 184 | 0.35 |
| Matting powder | 4.3 |
| Lencolo 3157 (leveling agent) | 1 |
| Thinner | 30 |
| total | 100 |
| Thinner (parts by weight) | Parts |
|---|---|
| EAC | 50 |
| BAC | 40 |
| PMA | 10 |
| total | 100 |
Q6. Is there a reference formulation for dual cure excimer resin? (Lencolo L-8461)
| Component (parts by weight) | Parts |
|---|---|
| Lencolo L-8461 (main excimer resin) | 70 |
| Lencolo L-6460 (auxiliary resin) | 10 |
| Photoinitiator TPO | 0.1 |
| Photoinitiator 184 | 0.2 |
| Photoinitiator MBF | 2 |
| Lencolo 3157 (leveling agent) | 0.5 |
| Matting powder | 2.5 |
| Butyl acetate | 14.7 |
| Thinning ratio | Matte Varnish : N3390 : BAC= 10 : 1 : (2~4) |
Q7. What is the difference between the Lencolo excimer resin models?
L-6367-1 — standard excimer UV polyurethane resin: good compatibility, good flexibility, fast wrinkle development, clear and uniform texture, soft elastic skin-feel; can be combined with high-functional elastic PU resins.
L-6367-2 — excimer UV polyurethane resin for spray application: low viscosity, 100% solids, fast wrinkle development, excellent compatibility, no precipitation at low temperature, fine and delicate skin-feel, good surface abrasion and RCA-tape resistance; also suitable for roller coating.
L-6367-3 — yellowing-resistant excimer UV polyurethane resin: good flexibility, excellent yellowing resistance, good compatibility, thick and full texture with a firmer skin-feel; can be combined with high-functional elastic PU resins.
L-6367-4 — cost-effective excimer UV polyurethane resin: fast wrinkle development, thick skin-feel texture, high cost-performance, good compatibility; can be combined with high-functional elastic PU resins.
L-6367-5 — yellowing-resistant excimer UV polyurethane resin: excellent compatibility, soft elastic skin-feel, fast curing; wrinkle speed and pattern size can be tuned by adjusting mono- and di-functional monomers.
L-6367-6 — fast-wrinkling excimer UV polyurethane resin: excellent compatibility, fast wrinkle development; wrinkle speed and pattern size can be tuned by adjusting mono- and di-functional monomers.
L-8461 — dual-cure excimer UV resin: fine and uniform skin-feel, good scratch resistance, good weather resistance; for automotive-interior dual-cure UV coatings and dual-cure UV inks, among others.
Q8. Where is excimer resin currently used?
Excimer resin technology is mature. Lencolo excimer resins form a soft skin-feel finish on PU, leather, ABS, PC, PET, various plastic films and paper-decorated surfaces, and have been successfully used on 3C electronic products, automotive interiors, home appliances and home-decoration surfaces.
Q9. Is there a demo video for excimer resin?
Yes — a video for L-6367-3 explains the application process, the resulting skin-feel effect and the application range of the coating. Ask the sales team for the video link/QR code.
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2025-01-06
2022-08-03
