SINOMER® PETMP: High-Performance Thiol-Ene Curing Agent for Acrylic Resins
Introduction
SINOMER® PETMP (Pentaerythritol Tetrakis(3-mercaptopropionate)) is a tetrafunctional thiol curing agent engineered for advanced acrylic resin systems. Leveraging rapid thiol-ene click chemistry, it enables fast curing, ultra-low shrinkage, and exceptional optical clarity, making it ideal for applications in electronics, optics, and 3D printing.
Key Advantages
- Ultra-Fast Curing: Achieves full cure in seconds to minutes under UV/thermal initiation.
- Near-Zero Shrinkage (<2%): Minimizes stress in precision applications like microelectronics.
- High Transparency: UV-stable, colorless cured films (ΔB <1.0 after 500h QUV testing).
- Versatility: Compatible with UV/thermal systems and hybrid formulations (e.g., epoxy-thiol).
Mechanism: Thiol-Ene Click Chemistry
SINOMER® PETMP’s four reactive thiol (-SH) groups undergo radical-mediated thiol-ene reactions with acrylic double bonds, offering:
- High Conversion Rates: >95% monomer conversion, reducing residual volatiles.
- Oxygen Inhibition Resistance: Surface cure quality comparable to nitrogen-purged systems.
- Flexibility Control: Adjust crosslink density by tuning acrylate/PETMP ratios.
Applications in Acrylic Resin Systems
1. Optical Adhesives & Coatings
- Use Case: Bonding smartphone screens or AR/VR lenses.
- Performance:
- Refractive index: 1.48–1.50 (matches glass/acrylic substrates).
- Light transmission: >99% at 450 nm (ASTM D1003).
2. 3D Printing Resins
- Use Case: High-resolution dental models or microfluidic devices.
- Benefits:
- 50% faster print speeds vs. traditional acrylates.
- <1% warpage due to low shrinkage.
3. Electronic Encapsulants
- Use Case: Potting for LED modules or sensors.
- Thermal Stability: Withstands -40°C to 150°C thermal cycling (MIL-STD-883).
Technical Specifications
| Property | SINOMER® PETMP | Industry Standard Thiols |
|---|---|---|
| Viscosity (25°C) | 300–500 mPa·s | 800–1,200 mPa·s |
| Thiol Equivalent | 140–160 g/eq | 180–220 g/eq |
| Odor Level | Low (maskable) | Strong mercaptan odor |
| Storage Stability | 12 months at 25°C | 6–8 months |
Formulation Guidelines
| Component | Role | Ratio (%) |
|---|---|---|
| Acrylate Resin | Base oligomer | 70–80 |
| SINOMER® PETMP | Curing agent | 15–25 |
| Photoinitiator (e.g., TPO) | UV activation | 1–3 |
| Additives | Flow agents, fillers | 2–5 |
Process:
- Mix components at 25°C under low-light conditions.
- Cure under UV (365 nm, 500–1,000 mJ/cm²) or heat (60°C, 10–30 min).
Case Study: Optical Adhesive for AR Glasses
- Challenge: Delamination due to thermal stress in AR lens assemblies.
- Solution: Switched to SINOMER® PETMP-based adhesive.
- Results:
- 0% delamination after 1,000 thermal cycles (-30°C to 85°C).
- Production throughput increased by 35% via 20-second UV curing.
Why Choose SINOMER® PETMP?
- Cost Efficiency: 20% lower formulation costs vs. specialty acrylates.
- Regulatory Compliance: REACH/RoHS-certified, halogen-free.
- Technical Support: Custom formulation assistance from Sinocure’s R&D team.
Upgrade Your Acrylic Formulations Today
Enhance curing speed and precision with SINOMER® PETMP.
📧 Email: info@sinocurechem.com | 📞 Tel: +86 15668330235