Key Technical Specifications
According to the product datasheet, T-7511 exhibits the following key properties:
Functionality: 2
Appearance: Clear liquid
Viscosity at 25°C: 500 mPa·s
Gloss (60°): <5
Elongation at break: 40%
Glass transition temperature (Tg): 32°C
Color (Gardner): 2
Acid value: ≤2 mg KOH/g
Solid content: 100%
Specific gravity: 1.08
These parameters indicate a moderately flexible UV resin system. The 40% elongation at break suggests good deformation tolerance, making it suitable for substrates that undergo slight bending or thermal expansion/contraction. The Tg of 32°C places the resin in the transition zone between glassy and rubbery states at room temperature, offering a balance between surface scratch resistance and flexibility.
Self-Matting Mechanism and Advantages
T-7511 does not contain silica, wax powders, or other conventional matting agents. Its low‑gloss effect originates from micro‑phase separation within the resin's molecular structure. During UV curing, a micro‑rough surface forms, which scatters incident light diffusely. Compared to filler‑based matting approaches, this self‑matting mechanism offers several practical benefits:
No settling risk: Matte powders often settle or form hard sediments during storage; T-7511 eliminates this issue entirely.
Higher transparency: Filler particles scatter visible light and cause haze or cloudiness. Self‑matting resins maintain optical clarity while delivering a matte appearance.
Smooth touch: The micro‑rough surface is well‑controlled, resulting in a silky feel without coarse or chalky texture.
Better flow and leveling: Absence of solid particles reduces surface defects and improves coating uniformity, especially in thin films.
Application Fields
UV Coatings
T-7511 can be used in matte topcoats for wood, paper, plastic films, and several engineering plastics (e.g., PC, PET).
Wood matte varnish: Because the resin is transparent and filler‑free, the natural wood grain remains clearly visible after coating, without whitening or texture masking. The low viscosity enables solvent‑free roller coating, and minor dilution with reactive monomers can adjust viscosity for spray applications.
Film coatings: On BOPP and PET films, T-7511 shows good adhesion. At coat weights of 5 – 15 μm, gloss is uniform and stable. The resin is suitable for producing pre‑coated matte films, release liners, and similar products.
Paper overprint varnish: For matte protective coatings on printed paper, the resin cures quickly, supports high‑speed printing lines, and yields a flexible film that does not become brittle or crack upon folding.
UV Inks
Recommended ink applications include paper printing inks, matte coatings for plastic films, and matte UV inkjet inks.
Pigment wetting: The polarity of T-7511 is compatible with common organic pigments and carbon black, allowing efficient pigment wetting and reducing dispersant demand.
Non‑thixotropic behavior: The resin does not cause abnormal viscosity increase or gelation, ensuring good stability and shelf life for formulated inks.
Inkjet compatibility: Ink systems containing T-7511 are free of solid particles, minimizing the risk of clogging piezoelectric printheads. The inherently low viscosity also facilitates the design of low‑viscosity inkjet formulations.
Curing Performance
T-7511 adapts well to various UV light sources. According to technical data, it cures rapidly under conventional mercury vapor lamps (H‑bulb or H‑plus bulbs). It is also suitable for LED‑UV curing systems, particularly with 395 nm LEDs. For LED curing, typical energy requirements range from 300 to 800 mJ/cm², depending on film thickness and formulation details.
Because the resin is supplied at 100% solids, it can be used directly in solvent‑free systems without preheating. If further viscosity reduction is required for applications such as fine‑atomization spraying, low‑viscosity monomers (e.g., IBOA, HDDA) can be added, but the effect on final gloss should be re‑evaluated.
Formulation Considerations
T-7511 is compatible with common acrylate monomers (mono‑, di‑, and trifunctional) and other resin types such as epoxy acrylates and polyester acrylates. When formulating with T-7511, the following points are worth attention:
Gloss stability: The self‑matting effect is sensitive to curing conditions (film thickness, UV energy, substrate temperature). To maintain batch‑to‑batch gloss consistency, these parameters should be well controlled.
Hardness adjustment: T-7511 itself is a two‑functional resin, offering medium film hardness. To improve surface scratch resistance, 5 – 30% of a higher‑functionality resin (e.g., a hexafunctional polyurethane acrylate) can be blended, though this may slightly increase gloss – bench‑top validation is recommended.
Compatibility testing: Although described as having "good compatibility," when introducing unusual resins or highly polar monomers, small‑scale mixing tests should be performed to check transparency and gloss uniformity.
Storage conditions: Store the resin in its original container, tightly sealed, away from heat and direct sunlight. Recommended storage temperature is below 25°C. Once opened, use promptly to avoid moisture uptake or oxygen‑induced changes.
Environmental and Regulatory Profile
T-7511 is 100% solids and contains no volatile organic solvents. During application, VOC emissions are negligible. This characteristic offers advantages in settings requiring low‑emission materials, such as interior wood coatings, overprint varnishes for paper, or external layers on food packaging (actual food‑contact compliance must be verified separately against local regulations).
Summary
T-7511 self‑matting UV resin delivers a stable ultra‑low gloss (<5 at 60°) without the need for added matting agents, while simultaneously offering low viscosity, high transparency, and good adhesion to a range of substrates. It serves as a practical option for UV coatings and UV inks where clarity, tactile surface quality, and appearance consistency are important. Formulators may use T-7511 as the primary film‑forming resin or blend it with other resins to balance gloss, hardness, and flexibility for specific end‑use requirements.