1. The core advantages of non-yellowing polyurethane acrylates
Aliphatic polyurethane acrylates have become the preferred material for high-end transparent coatings due to their non-yellowing properties. Compared with aromatic structures, aliphatic molecular chains can resist UV degradation and maintain the transparency of coatings for a long time. For example, Allnex's EBECRYL® 8808 achieves a Gardner color of ≤1 and a transmittance of ＞92% after curing through aliphatic design, which is suitable for weather-resistant scenes such as automotive varnishes and outdoor signs. Its technical advantages include:
Yellowing resistance: color difference ΔE＜1.5 after 1000 hours of QUV aging test;
Mechanical properties: balance of high toughness (tensile strength 36MPa) and flexibility (elongation at break 63-85%);
Formulation flexibility: viscosity range 8,000–28,000cPs, suitable for spraying, roller coating and other processes.
2. Application innovation of transparent coating in four major fields
Coating field
Automotive clearcoat: As the final finishing layer, it provides high gloss and scratch resistance. The chemical resistance of polyurethane acrylate can resist the erosion of gasoline and detergents, and the global market penetration rate will increase to 35% in 2025.
Electronic protective coating: used for mobile phone screens and circuit board packaging, it needs to pass the 85℃/85%RH wet heat test, and the adhesive layer strength retention rate is greater than 90%.
Ink field
Outdoor printing ink: such as advertising banners and car body films, rely on non-yellowing resins to maintain color stability. After matching with UV absorbers, the weather resistance life is extended by 3 times.
Adhesives and pressure-sensitive adhesives
Medical pressure-sensitive adhesives: Shenzhen U-Sunny's T-7333 resin breaks through industry bottlenecks with low shrinkage (<3%) and biocompatibility:
After curing, the light transmittance is >92%, suitable for transparent medical dressings;
Passed ISO 10993 test, supports wearable device patches;
Viscosity 8,000cPs (25℃), compatible with roller coating and spraying processes.
Industrial tape: The bonding strength to metal coatings is 8N/cm, and the temperature range is -45℃ to 80℃.
3. Technological breakthrough of Shenzhen U-Sunny T-7333 resin
This product achieves performance innovation through a difunctional aliphatic structure:
Molecular design: molecular weight 3,500 (GPC method), diacrylate group improves crosslinking density, and cohesion increases by 40%;
Environmental protection: 100% active ingredients, VOC emissions are close to zero, and energy consumption is reduced by 60% compared with hot melt adhesive;
Application cases:
Solar backplane tape: no delamination after 500 hours of water immersion test, ΔE <1.5 after QUV aging;
Electronic film label: low shrinkage characteristics avoid curling of PET substrate and improve lamination accuracy.
4. Industry Trends and Sustainable Development
Technical Directions:
Water-based/solvent-free formulas meet environmental regulations (such as EU Reach;
Smart adhesive development to respond to temperature/humidity changes to achieve self-adjusting adhesion.
Market Opportunities: Emerging fields such as new energy equipment packaging and flexible electronics drive demand to grow by 12% annually.
Non-yellowing polyurethane acrylates reshape the standard of clear coatings with weather resistance and versatility. Shenzhen U-Sunny T-7333 and other products provide low-yellowing, high-adaptability solutions for adhesives, automotive coatings and other fields through molecular structure optimization. In the future, bio-based raw materials and intelligent response technology will further unleash potential