Key Features of T-7222
1. High Toughness and Flexibility
T-7222 exhibits outstanding韧性 (toughness) while maintaining sufficient flexibility for soft or deformable substrates. Unlike brittle UV resins that crack under bending or thermal cycling, T-7222-based systems resist cracking even in thick-film applications. This makes it particularly suitable for flexible decorative coatings, structural UV adhesives, and sealants.
2. Broad Substrate Adhesion
One of the most notable characteristics of T-7222 is its adhesion to both plastic and metal materials. It bonds effectively to:
Engineering plastics (PC, ABS, PVC, PMMA)
Oxidized metal surfaces (aluminum, magnesium, steel)
Glass and ceramics
Various polymer films (PET, PI, TPU)
The resin can be used as the primary oligomer to achieve direct adhesion without a primer on many substrates. It also withstands boiling water testing (retort resistance) when used alone.
3. Hydroxyl Functionality for Post-Crosslinking
T-7222 contains a small amount of hydroxyl (-OH) groups. While the primary cure is UV-induced free radical polymerization, these hydroxyl groups allow secondary crosslinking reactions with isocyanate or amino resins. This post-curing step significantly improves chemical resistance, humidity resistance, and thermal shock performance.
4. High Tolerance for Hard Resins
The resin shows good compatibility with various hard resins (e.g., highly functional acrylates, epoxy acrylates). Formulators can blend T-7222 with harder oligomers to increase final coating hardness while maintaining adhesion. The high tolerance prevents phase separation or loss of flexibility.
Application Fields
UV Adhesives
As a main resin in UV-curable adhesives, T-7222 provides:
Low shrinkage – reduces stress on bonded substrates.
Thick-layer curing – resists internal cracking even at film thickness >200 µm.
Thermal cycle resistance – withstands repeated high-low temperature shocks (-40°C to 125°C typical).
Typical uses include structural bonding of dissimilar materials (plastic to metal), sealing of electronic components, and conformal coatings requiring impact resistance.
UV Coatings
In UV coating formulations, T-7222 delivers:
Adhesion to oxidized metal coatings (e.g., anodized aluminum, conversion-coated steel).
Direct bonding to glass and ceramic surfaces.
Compatibility with high‑performance polymer films used in display or automotive interior applications.
Post-cured film resistance to alcohols, solvents, and aggressive chemicals.
For soft-touch or flexible coatings on substrates like TPU or soft PVC, T-7222 serves as the primary binder without sacrificing elongation.
UV Inks
The resin can be used in screen, flexo, or inkjet inks for plastic and metal packaging. Its pigment wetting capability and cure response are adequate for high-speed printing lines, and the cured ink layer passes boiling water or sterilization tests.
Formulation Compatibility
Monomers
T-7222 is miscible with most common UV-reactive monomers (IBOA, HDDA, TMPTA, etc.). For applications demanding long-term hydrolytic stability, it is recommended to combine T-7222 with hydrophobic monomers such as AM-319 (a proprietary monomer with low water absorption). This pairing minimizes moisture ingress and improves resistance to humid aging.
Solvents
The resin dissolves readily in esters (ethyl acetate, butyl acetate), ketones (acetone, MEK, MIBK), and aromatic hydrocarbons (toluene, xylene). However, it does not dissolve in pure alcohols (ethanol, IPA, butanol). If alcohol dilution is needed, use a mixture of alcohol with an ester or ether solvent (e.g., ethanol/ethyl acetate 1:1).
Polymers
T-7222 shows excellent compatibility with:
Polyester resins (saturated and unsaturated)
Epoxy resins (bisphenol A, novolac types)
Polyurethane dispersions and solvent-borne PU
Phosphate esters (adhesion promoters)
Acrylic resins (thermoplastic and thermoset)
This wide compatibility allows formulators to adjust tack, open time, hardness, and flexibility without risking phase separation.
Post-Curing Crosslinking Options
For applications requiring enhanced chemical or thermal resistance, T-7222 can be post-crosslinked via its hydroxyl groups.
With Isocyanate (HD-1020)
HD-1020 is a recommended polyisocyanate crosslinker. The reaction occurs at room temperature or slightly elevated temperatures (40–60 °C), which is compatible with heat-sensitive plastic substrates. Post-crosslinking improves:
Solvent resistance (MEK double rubs)
Resistance to high temperature/high humidity (85 °C/85% RH)
Adhesion retention after water immersion
Typical NCO/OH ratio: 1.0–1.2. Pot life at room temperature is several hours depending on solvent and catalyst.
With Amino Resin (Methylated Melamine)
T-7222 also reacts with methylated melamine-formaldehyde resins. However, this requires an appropriate acid catalyst (e.g., p-TSA, DDBSA) to lower the curing temperature (typically 80–120 °C). This option is suitable when faster thermal cure or higher hardness is needed, and the substrate can tolerate moderate heat.
Storage and Handling
Store in a cool, dry place away from direct light and heat.
Keep containers tightly sealed to prevent moisture absorption, which can affect isocyanate crosslinking performance.
Shelf life: 12 months from production date when stored below 30 °C.
Conclusion
T-7222 (Trust7222) is a versatile UV-curable resin that combines high toughness, broad adhesion to plastics and metals, and the ability to undergo post-curing crosslinking. Its compatibility with various monomers, solvents, and polymers allows formulation flexibility across UV adhesives, coatings, and inks. For demanding applications requiring thermal shock resistance, humidity tolerance, or chemical resistance, T-7222 provides a reliable backbone, especially when combined with isocyanate crosslinkers like HD-1020 or hydrophobic monomers such as AM-319.
When developing your next UV system for soft substrates, metal bonding, or high-reliability electronics, consider T-7222 as a balanced starting point for adhesion and durability.