1. Industry Challenge: Balancing Low‑Energy Curing, Flexibility & Color Performance
As UV LED curing becomes the mainstream due to environmental and energy demands, many conventional resins struggle with long‑wave LED (365 nm / 395 nm) or very low energy exposure – leading to tacky surfaces or poor adhesion. At the same time, high flexibility often sacrifices scratch resistance, and vivid colors require high pigment loading, which negatively affects curing depth and adhesion.
T-7135 resin is a specialty polyurethane acrylate (PUA) designed precisely to overcome these conflicts, delivering outstanding performance under low energy, high pigment loads, and demanding applications.
2. Key Performance Advantages of T-7135 Resin
2.1 Ultra‑Fast Curing – Fully Reacts Under Low‑Energy LED
T-7135 exhibits high photo‑reactivity. Even under LED long‑wave sources (365–405 nm) or very low UV energy (e.g., 50–150 mJ/cm²), it achieves thorough through‑cure. The resulting coating is dry to the touch, non‑tacky, with low heat generation – ideal for heat‑sensitive substrates (films, plastics) and thick applications.
2.2 Superior Flexibility + Excellent Scratch Resistance
Unlike many soft but weak resins, T-7135 provides both toughness and high scratch resistance. Cured films withstand bending and folding without cracking, while resisting daily abrasion and scratches – essential for long‑lasting nail gel top coats and flexible inks.
2.3 Permanent Non‑Yellowing – High Clarity Retention
Thanks to a special non‑yellowing chemical structure, the coating remains water‑clear or true to color even after prolonged UV exposure or natural light aging. When used in gel top coats or clear protective varnishes, it never turns yellow or dull over time.
2.4 Excellent Pigment Wetting & Colour Development
T-7135 disperses both organic and inorganic pigments exceptionally well. You need lower pigment loading to achieve high saturation and vivid colors – reducing color paste consumption while minimising the negative impact of pigments on cure speed.
2.5 Good Monomer Miscibility – Recommended with AM‑319
The resin is fully miscible with a wide range of conventional UV monomers (mono‑, di‑, multi‑functional acrylates), offering high formulation flexibility. It is especially recommended in combination with AM‑319 (4‑tert‑butylcyclohexyl acrylate) to significantly improve adhesion on difficult substrates (PET, PP, PC, glass, metal) and enhance hydrolysis resistance under hot & humid conditions – extending product lifetime.
3. Typical Applications & Formulation Tips for T-7135 Resin
✅ UV Gel Nails (Nail Polish / Soak‑off Gel)
Top Coat – Fast drying, glossy, smooth, non‑tacky surface with no yellowing.
One‑Step / Pigmented Gel – Even with high colour or pearl pigment loading, maintains excellent adhesion to natural nails (no peeling). Low heat evolution – no burning sensation during LED curing.
Recommended blend – T-7135 : AM-319 = 7:3 ~ 5:5, plus photoinitiators (e.g., TPO, 819) and a levelling agent.
✅ UV Inks
Screen Printing Ink – Fast drying on PE, PET, PVC films – no ink build‑up or blocking. Flexible, fold‑resistant, and highly scratch‑resistant.
Flexo Ink – Low‑viscosity yet high reactivity for high‑speed printing. High colour strength at low pigment load – saves cost.
Recommended blend – T-7135 with a small amount of high‑functional monomer (e.g., DPHA) to adjust hardness without losing gloss.
✅ UV Adhesives
Electronics bonding / Medical assembly – Low‑energy LED curing, safe for heat‑sensitive components. Tough and vibration‑resistant.
Coloured adhesive layer – Good pigment/filler wetting preserves cure depth and adhesion to substrates.
4. Synergy with AM‑319: Boosting Adhesion & Hydrolysis Resistance
| Property | T-7135 alone | T-7135 + AM-319 (3:2) |
|---|---|---|
| Adhesion on PET film (cross‑cut) | 4B | 5B |
| Adhesion after 2h boiling water | 3B | 5B |
| Scratch resistance (steel wool, 500g) | No visible marks | Excellent |
| Flexibility (180° fold) | No cracking | No cracking |
| Pigment wetting (phthalocyanine blue) | Excellent | Excellent |
Test data shows that AM‑319 effectively reduces curing shrinkage stress, enhances interfacial adhesion, and improves the hydrolysis stability of the crosslinked network.
5. Typical Technical Specifications of T-7135 Resin
| Property | Value |
|---|---|
| Appearance | Colourless to pale yellow clear liquid |
| Functionality | 2 (difunctional) |
| Viscosity (mPa·s @ 60°C) | 2000 – 4000 |
| Colour (APHA) | ≤ 80 |
| Solid content | 100% |
| Recommended photoinitiators | TPO, 819, 184 (with amine synergist) |
| Recommended LED wavelength | 365 nm, 385 nm, 395 nm |
Note: Typical values, may vary slightly between batches.
6. Frequently Asked Questions (FAQ)
Q: Can T-7135 be used in pure UV inkjet inks?
A: Yes, but adjust viscosity and surface tension according to printhead requirements. Use low‑viscosity monomers (e.g., AM-319, IBOA) and suitable dispersants.
Q: What happens when blending with epoxy acrylates?
A: Good compatibility. Adding epoxy acrylates increases hardness and chemical resistance, but slightly reduces flexibility. Perform stepwise ratio tests.
Q: How deep does it cure in black ink (high carbon black content)?
A: Due to its excellent pigment wetting and high reactivity, even with 3‑5% carbon black, good through‑cure can be achieved using high‑power LED and photoinitiator combinations (e.g., ITX + 819).
7. Conclusion: T-7135 – The Ideal Resin for Low‑Energy, High‑Performance UV Systems
Whether you need fast‑curing nail gel top coats, flexible & fold‑resistant films for printing inks, or adhesives demanding strong adhesion and ageing resistance, T-7135 resin delivers ultra‑fast curing, toughness + scratch resistance, non‑yellowing clarity, and vivid colour expression. The synergistic combination with AM‑319 monomer further unlocks high adhesion and hydrolysis resistance for demanding substrates and humid environments.
If you are looking for a UV resin that balances efficiency, aesthetics, and durability, T-7135 is a strong candidate for your next formulation.