1. Product Introduction
T-7002 is a two-functional polyurethane acrylate resin designed for UV-curable formulation systems. Through molecular structure engineering, this product achieves a balance between low viscosity and film performance. With a solid content of 100%, it is a solvent-free resin suitable for environmentally conscious applications.
2. Key Technical Features
Low Viscosity
T-7002 exhibits a viscosity of 400 mPa·s at 25°C. This ultra-low initial viscosity significantly reduces the overall application viscosity of formulations, minimizing the need for excessive reactive diluents. In processes requiring high flowability-such as UV inkjet printing and solvent-free coating-this characteristic enhances processing efficiency and workability.
Flexibility
The resin has a glass transition temperature (Tg) of -32°C and an elongation at break of 55%. These parameters indicate that the cured film offers excellent flexibility and extensibility, allowing it to accommodate substrate expansion, contraction, and deformation while effectively relieving internal stress and preventing cracking.
Adhesion and Hydrolysis Resistance
T-7002 demonstrates strong adhesion to a wide range of plastic substrates, including PVC coils, OPP films, PC sheets, PA, and PET. Its acid value is controlled below 2 mg KOH/g, and its chemically stable structure provides good hydrolysis resistance, making it suitable for applications in moist environments.
Color Stability
With a Gardner color index of 1, the resin maintains optical clarity and color stability over time. This makes it suitable for light-colored products or transparent coatings where color fidelity is important.
Curing Performance
T-7002 offers a moderate curing speed and is compatible with various photoinitiator systems, supporting different production efficiency requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Functionality | 2 |
| Viscosity (25°C) | 400 mPa·s |
| Glass Transition Temperature (Tg) | -32°C |
| Molecular Weight (GPC) | ~1200 |
| Elongation at Break | 55% |
| Color (Gardner) | 1 |
| Acid Value | ≤2 mg KOH/g |
| Specific Gravity | ~1.10 |
| Solid Content | 100% |
3. Primary Applications
UV Pressure-Sensitive Adhesives (PSAs)
In PSA formulations, T-7002 provides high initial tack and balanced cohesion, along with low shrinkage characteristics. Its high flexibility helps the adhesive layer maintain integrity during peeling, reducing the risk of residue. Typical applications include label films, protective tapes, and electronic component fixing tapes.
UV Inkjet Inks
As a backbone resin for inkjet inks, T-7002's low viscosity contributes to smooth jetting performance and reduces the risk of nozzle clogging. The resin offers reliable adhesion to various plastic substrates and exhibits excellent pigment wettability, enhancing color stability and print quality.
UV Inks and Solvent-Free Coatings
In screen printing, roller coating, and curtain coating processes, T-7002 effectively reduces system viscosity to accommodate different application methods. Its low shrinkage特性 helps minimize edge feathering in printed patterns, making it suitable for high-precision labels and packaging materials.
3D Printing
The low viscosity facilitates uniform resin filling during layer-by-layer stacking while maintaining film strength. Its flexibility helps relieve interlayer stress and reduces the risk of cracking in printed parts.
4. Formulation Compatibility
Monomer Compatibility: T-7002 is miscible with various conventional monomers. Multi-functional ethoxylated or propoxylated monomers can be incorporated to adjust crosslinking density and mechanical properties.
Solvent Compatibility: The resin is soluble in ester, ketone, or aromatic hydrocarbon solvents, but is not soluble in alcohols alone.
Polymer Compatibility: T-7002 shows good compatibility with polyester, epoxy, polyurethane, and acrylate polymer systems.
5. Summary
T-7002 is a two-functional polyurethane acrylate resin that achieves a practical balance between low viscosity and flexibility. Its technical parameters cover multiple UV-curable application areas including pressure-sensitive adhesives, inkjet printing, inks and coatings, and 3D printing. The 100% solids formulation also aligns with the industry trend toward solvent-free, low-VOC manufacturing.