2µm sio2 hybrid sol-gel release liner for metal surface protection

Overview

This solution is an ultra-thin (2µm) hybrid sol-gel release coating composed of SiO2 and natural cellulosic content. The coating chemically adheres (crosslinks) to metal surfaces, providing dual functionality: significant anti-corrosion protection and non-stick release properties. It addresses the need for mould release liners that can withstand harsh environments while protecting the underlying metal substrate. Potential applications include metal casting, composite manufacturing, and industrial processes where both surface protection and clean release are required.

Technical specifications

Key features:

• Hybrid sol-gel chemistry: Combines SiO2 with natural cellulosic content to create a coating with both protective and release properties
• Chemical crosslinking: The coating bonds directly to metal surfaces, ensuring durable adhesion
• Ultra-thin profile: Applied at only 2µm thickness, minimizing material use and weight impact
• Anti-corrosion performance: Validated through more than 3000 hours of acidic salt spray testing on coated aluminum with no dent or degradation observed
• Release functionality: A specific formulation demonstrated significant non-stick and release properties on paper substrates, with adhesive tape unable to bond to coated surfaces
• Versatile substrate compatibility: Currently validated on aluminum, with future testing planned across various alloys

Technology readiness level

The coating has undergone substantial laboratory validation, including extended acidic salt spray testing exceeding 3000 hours on aluminum substrates with no observed defects. Release properties have been confirmed on paper substrates. Future validation efforts will test the coating across a range of alloys using Q-panel test methods and evaluate release performance with various molten metals and compounds. The research and validation program is estimated to take one year to complete. The technology is currently at an advanced R&D stage, ready for collaborative refinement toward specific industrial applications.