In the fields of new energy vehicles, consumer electronics, and flexible circuits, the uniformity of insulating coatings directly determines product safety and lifespan. Traditional insulating varnishes face two major bottlenecks: first, the risk of localized electrical breakdown due to spray thickness deviations; second, the difficulty in balancing high weather resistance with low viscosity process adaptability. However, UV insulating inks based on U-9310 cationic curable resin, with their zero-oxygen inhibition, deep curing, and ultra-high aging resistance, are becoming a core material for breaking through the barriers of precision manufacturing.
Industry Pain Point: Insulation Coating Uniformity Determines Safety Margins
In aluminum alloy casings for lithium-ion batteries, high-density PCBs, or flexible sensors, insulation coating thickness deviations exceeding 5 microns can cause localized electric field distortion, leading to electrical breakdown, thermal runaway, or even explosion. Existing solutions are limited by the following:
High-viscosity resins cannot be inkjet printed: Conventional insulation varnishes have viscosities exceeding 100 mPa·s, far exceeding the 20 mPa·s threshold required for inkjet printing.
Thermosetting processes damage the substrate: High temperatures can cause metal deformation or warping of polymer substrates.
Incomplete free radical curing: Oxygen inhibition leads to surface tackiness and insufficient chemical resistance.
U-9310 Resin: Cationic Curing Rewrites the Boundary of Performance
As a cationic polyurethane acrylate resin, U-9310's molecular design directly addresses industry pain points:
1. Zero-oxygen inhibition and deep cure
The cationic initiator generates persistently active acid centers under UV irradiation, allowing continued reaction even after the light source is removed, completely eliminating surface tack.
The cured film density is increased by over 30%, with salt spray resistance exceeding 720 hours (adhesion maintained at level 0) and stable dielectric strength exceeding 54kV/mm.
2. Low-temperature, high-efficiency compatibility with sensitive substrates
The curing process eliminates damage to temperature-sensitive substrates (such as PI films and lithium battery aluminum casings), achieving shrinkage of less than 1mm (compared to >10mm for conventional resins).
Adjustable viscosity from 8-20mPa·s, perfectly compatible with inkjet printing processes, achieving a 100μm coating thickness deviation of less than 5μm.
3. Chemical bonding enhances interface durability.
The epoxy and hydroxyl groups in the resin form covalent bonds with the polyurethane structural adhesive, increasing bonding strength by 200%.
Passed the double 85 aging test (85°C/85% RH) and maintained adhesion at level 0 after 1000 hours.
Four High-Value Application Scenarios
1. New Energy Battery Module Insulation and Packaging
After inkjet coating, aluminum shells achieve a fivefold increase in electrolyte corrosion resistance, meeting automotive protection requirements for 15 years.
2. Printed Circuit Boards (PCB/FPC)
Replaces traditional thermosetting inks, achieving line width accuracy of 20μm and resistance to plating solutions (acidic copper chloride/alkaline etching solutions).
3. Flexible Electronic Sensors
Achieve 100,000 bends with unchanged insulation resistance on PI/PET substrates.
4. Semiconductor Wafer-Level Packaging
Wafer Redistribution Linear Layer (RDL) pattern protection, resistant to hydrofluoric acid etching.
Future Trends: Green Manufacturing and Functional Integration
With the EU RoHS 3.0 tightening restrictions on photoinitiators, the next generation of UV insulation inks will focus on:
Water-based cationic systems: Incorporating nano-SiO₂ to increase UV shielding efficiency to >90% (e.g., food-safe ink technology)
3D-printed insulation structures: Directly writing three-dimensional insulation topologies using inkjet technology
Self-healing: Incorporating microcapsules for automatic sealing of localized damage.
UV insulation ink has evolved from a "protective material" to a "core medium for precision manufacturing," driven by innovations in resin technology. U-9310 cationic curing resin eliminates oxygen inhibition, achieves deep low-temperature curing, and enhances bonding interfaces, providing the underlying support for high-reliability insulation applications.