In UV curing systems, resin purity, odor control, and long-term stability are critical considerations for formulators. T-7005 is a difunctional urethane-modified acrylate UV resin that features exceptionally pure color and low odor. It offers strong adhesion, and its cured coatings exhibit non-yellowing properties, excellent resistance to thermal shock, and good hydrolysis resistance. When used as a main resin for plastic sheets and various film materials, the cured coating maintains stable adhesion even under prolonged high-temperature and high-humidity conditions. It resists湿热 (heat and moisture), and the adhesive layer does not hydrolyze or turn cloudy.
I. Physical Properties
T-7005 has a molecular weight (GPC) of 3,900 and a glass transition temperature (Tg) of 15°C. This Tg value indicates good flexibility and adaptability at room temperature.
In terms of mechanical performance, T-7005 exhibits an elongation at break of 70%, demonstrating outstanding flexibility and deformation resistance after curing.
In appearance, the Gardner color value is 1, reflecting high color purity and transparency. Its low-odor characteristics are also notable, making it suitable for applications where user experience is a priority.
For chemical stability, the acid value is no more than 2 mg KOH/g, which contributes to reliable storage stability.
Viscosity at 25°C ranges from 45,000 to 75,000 cPa.s. This relatively high viscosity provides good leveling and coverage in specific applications. Specific gravity is 1.08.
II. Application Areas
UV Adhesives
In UV adhesives, T-7005 is primarily used in the base coat or pigmented coat of UV nail gel. Its adhesion ensures strong bonding between the coating and the substrate. The product is non-irritating, low-odor, and exhibits good color development. Cured coatings do not yellow, resist thermal shock, and show excellent hydrolysis resistance.
UV Coatings and Inks
In UV coating and ink formulations, T-7005 is used as a complementary component, mainly to enhance flexibility of the system. Its high flexibility does not compromise the coating's resistance to boiling water. When used as the main resin for plastic sheets and various films, the cured coating maintains stable adhesion under prolonged high-temperature and high-humidity conditions, with no hydrolysis or whitening of the adhesive layer.
III. Formulation Recommendations
Monomer Selection
T-7005 is compatible with a wide range of conventional monomers. AM-313 monomer is recommended in formulation design. AM-313 is a monofunctional acrylate monomer that offers fast curing speed, good toughness, strong adhesion, and excellent water resistance. This combination ensures fast curing under LED light sources while improving adhesion to various substrates and enhancing hydrolysis resistance.
Additive Recommendation
For defoaming, Elite770 high-transparency acrylate defoamer is recommended. Elite770 is a high-molecular-weight acrylate polymer with high compatibility; it does not cause cratering or affect interlayer adhesion. Its high transparency avoids the cloudiness or haze often seen with conventional defoamers, making it particularly suitable for use in transparent material applications, and it can be added at any stage.
Solvent Selection
T-7005 is miscible with esters, ketones, or aromatic hydrocarbon solvents, but it is not soluble in single alcohol solvents. It is recommended to dissolve it in mixed solvents containing alcohols and ethers.
Polymer Combination
Combining T-7005 with T-7136B resin can significantly improve the surface drying speed under low-energy LED light sources. T-7136B is a trifunctional urethane acrylate that offers fast curing, high hardness, and good alcohol resistance, suitable for low-energy curing with 405nm or 395nm light sources.
IV. Conclusion
T-7005 is a difunctional urethane-modified acrylate UV resin characterized by exceptionally pure color and low odor. It has a molecular weight of 3,900, a Tg of 15°C, elongation at break of 70%, Gardner color value of 1, acid value ≤2 mg KOH/g, and viscosity of 45,000–75,000 cPa.s at 25°C. In UV adhesives, it is suitable for nail gel base coats and pigmented coats; in UV coatings and inks, it enhances flexibility without reducing resistance to boiling water. The recommended formulation includes AM-313 monomer, Elite770 defoamer, and T-7136B resin.