Technical Properties
T-7130 is a solvent-free, 100% solids UV-curable resin with a medium viscosity of approximately 1650 mPa·s at 25°C, making it suitable for spray coating, roller coating, and screen printing processes. Key specifications include:
| Property | Value | Significance |
|---|---|---|
| Acid Value | ≤ 3 mg KOH/g | Enables direct adhesion without corrosion risk |
| Tg | 45°C | Balances rigidity with toughness |
| Elongation at Break | 30% | Provides flexibility and impact resistance |
| Molecular Weight | 3300 g/mol | Optimized for viscosity and cure speed |
| Color (Gardner) | ≤ 2 | Suitable for clear coatings |
The ultra-low acid value is a critical design feature. High-acid resins (typically >15 mg KOH/g) can cause electrochemical corrosion on sensitive metal surfaces. At ≤3 mg KOH/g, T-7130 eliminates this risk while enabling direct molecular bonding through strong hydrogen bonding and van der Waals interactions with inorganic substrates.
Core Advantages
No Pre-Treatment Required. T-7130 achieves direct adhesion on stainless steel, anodized aluminum, water-plated chrome, float glass, tempered glass, crystal glass, ITO conductive film, and PCB boards without surface activation. This eliminates costly steps like hydrofluoric acid etching for glass or hexavalent chromium conversion coating for metals.
Exceptional Durability. The cured film offers outstanding scratch resistance, thermal stability, and chemical resistance. It withstands room-temperature water and boiling water exposure while maintaining adhesion and flexibility-even after vacuum evaporation or extended water boil tests.
Low Shrinkage and High Double Bond Conversion. Low volumetric shrinkage minimizes internal stress, reducing the risk of delamination or cracking on rigid substrates. High double bond conversion ensures thorough curing and reliable long-term performance.
LED Curing Compatible. The resin cures efficiently under LED light sources, supporting modern, energy-efficient production environments.
Primary Applications
1. UV Base Coat for Vacuum Metallization
In premium packaging-perfume bottles, wine closures, cosmetic caps, and metal decorative components-T-7130 serves as a high-performance primer for vacuum plating. Applied as a thin UV-cured layer onto glass or metal, it creates a smooth receptive surface for aluminum or other metal vapor deposition. The resin prevents common plating defects such as hazing or blooming, ensures a brilliant clear metal finish, and locks the metal layer in place with adhesion that survives subsequent water boil tests.
Performance data: On soda-lime glass, aluminum plating bonding strength reaches 8.7 N/cm using T-7130 primer (compared to 3.2 N/cm with traditional processes). A wine packaging manufacturer increased yield from 82% to 99% and reduced annual chromium-containing wastewater emissions by 350 tons by eliminating hydrofluoric acid etching.
2. UV Curing Adhesives
For bonding dissimilar materials-glass to metal, ceramic to stainless steel, or glass to plastic-T-7130 acts as a high-strength structural adhesive. It provides rapid cure speed, high ultimate bond strength, and critically, low shrinkage. The low volumetric shrinkage reduces internal stress at the bond line, a common cause of adhesive failure on rigid substrates. The cured crosslinked network exhibits excellent water resistance, maintaining adhesion and integrity even after prolonged high-temperature, high-humidity exposure or water boiling.
3. UV Curable Inks
As a binder resin in UV screen printing inks, T-7130 significantly enhances ink adhesion on non-absorbent smooth surfaces such as glass, treated metals, ITO films, and certain plastics. It performs well in highly pigmented formulations and offers good chemical resistance. Applications include durable label printing (e.g., beverage labels requiring ice water resistance), screen printing on electronic glass or metal housings, and PCB surface treatment-free inks for clean copper surfaces and FR-4 substrates without browning or micro-etching steps.
Formulation Guidance
For specific applications, targeted monomer selection optimizes performance:
Vacuum plating base coats: Combine with AM324 monomer to reduce shrinkage, increase cure speed, and prevent plating haze.
Demanding adhesive bonds: Combine with FM-350B monomer to minimize volumetric shrinkage and maximize final adhesion strength.
Summary
T-7130 is a dual-functional polyurethane acrylate UV resin designed to address the core challenge of adhesion on difficult inorganic substrates. Its ultra-low acid value (≤3 mg KOH/g) enables direct, pre-treatment-free bonding to glass, ceramics, and metals while eliminating corrosion risk. With a balanced Tg (45°C) and elongation at break (30%), it provides both rigidity and flexibility for demanding applications. Primary use cases include vacuum metallization base coats, high-strength structural adhesives for dissimilar materials, and UV-curable inks for non-absorbent surfaces. When combined with appropriate monomers (AM324 for plating applications, FM-350B for adhesives), T-7130 delivers consistent, reliable performance in industrial production environments.