The core material system is compatible with its characteristics
Substrate characteristics
PET substrate: High-temperature resistant polyester film, with a temperature resistance range of 180-200℃, featuring excellent physical properties, chemical stability and dimensional stability. Through crystallization treatment or the addition of components such as glass fiber, the temperature resistance can be increased to above 200℃ (for example, DuPont PET E5264 contains 36% glass fiber reinforcement and has a temperature resistance of up to 200℃). It features high transparency, corrosion resistance, low moisture permeability (better at low temperatures) and recyclability.
High-temperature resistant modified materials: such as fluorine-containing polyimide film layers, T-7133 resin (tri-functional aliphatic polyurethane acrylate, glass transition temperature 80℃, high hardness and chemical corrosion resistance after curing), or by adding UV absorbers and light stabilizers to enhance UV resistance performance.
Functional coating
UV protection layer: UV absorbers or UV protection resins (such as T-7133) are used to block UVA/UVB radiation, preventing the substrate from aging, fading or cracking. For instance, the stickers on electric vehicles remain bright in color after being exposed to the sun through an anti-UV coating.
Anti-sticking layer: Silicone oil, fluoroplastic or non-silicone coating achieves low peel force (light peel type ≤0.1N/25mm), combined with nano anti-sticking technology (such as nanoparticles building a "microscopically rough but macroscopically smooth" surface to reduce interfacial adhesion), reducing adhesion and facilitating peeling.
Anti-scratch layer: For instance, apply an anti-scratch coating (2-3μm thick) on the surface of the silicone layer to enhance wear resistance.
2. Processing technology and technological innovation
Precision coating and curing
Coating process: The uniform coating of the resin layer is achieved by using anilox roller transfer coating and micro-concave coating technology. The UV curing energy is ≥300mJ/cm², ensuring the density of the coating and the conversion rate of double bonds. For instance, the high-temperature resistant PET protective film is processed through 7 sections of 3m high-temperature ovens (at a speed of 20m/min), followed by preheating (140-160℃), high-temperature baking (180-200℃), setting (140-160℃), and cooling (standing for 40-48 hours), achieving a thermal shrinkage rate TD of ≤0.041% and a surface hardness of ≥4H.
Composite process: Multi-layer structures (such as PET substrate + silicone layer + scratch-resistant layer) are laminated under pressure through a composite wheel, and after cooling, the edges are cut and wound up to ensure interlayer adhesion and dimensional stability.
Nano anti-sticking technology
Nanoparticles (such as SiO₂, Al₂O₃) form low surface energy coatings through chemical bonds or mechanical interlocking, with a contact Angle greater than 90°. This reduces the adhesion of molten materials, lowers demolding resistance by over 50%, and enhances wear resistance by 3 to 5 times (hardness HV 2000-3000). They can withstand high temperatures ranging from 300 to 800 ° C and are suitable for high-temperature scenarios such as thermosetting plastics and die-casting.
3. Key performance and Quality control
High-temperature resistance: The thermal shrinkage rate at 180℃ for 30 minutes is ≤0.041%, and there is no deformation after short-term use at 200℃. It is resistant to chemical corrosion (acid, alkali, alcohol mixture) and has strong burn resistance.
UV resistance and weather resistance: UV blocking rate ≥98%, double 85 test (85℃/85% RH for 500 hours) no coating peeling or substrate deformation, salt spray test ≥96 hours no red rust.
Anti-stick and mechanical properties: Peel strength 0.1-2.0N/25mm (light/heavy peel type), high wear resistance (such as nano-coating hardness HV 2000-3000), excellent tensile strength and impact strength, dimensional stability (linearity ≤1.2%).
Environmental protection and safety: Complies with RoHS and REACH standards, no halogen or harmful substances are released, and has a high recyclability rate.
4. Application scenarios and typical cases
Automotive industry: Used for sunroofs and car window anti-explosion films, integrating AG (anti-glare), AR (anti-reflection), and AF (anti-fingerprint) functions, enhancing display contrast and safety. The stickers for electric vehicles keep their colors bright through an anti-UV coating.
Electronic manufacturing: Suitable for ITO conductive films and flexible circuit board (FPC) protection, preventing damage from solder slag and chemical reagents. When semiconductor wafers are cut, they are fixed by UV anti-sticking protective films, and after processing, they are peeled off under ultraviolet light without leaving any residue.
Architecture and packaging: Building curtain walls and outdoor billboards maintain long-term visual effects by utilizing weather resistance. Food packaging and medical equipment reduce contamination and damage through anti-stick coatings.
In the field of new energy: photovoltaic module bonding, insulation layer for hydrogen fuel cells, suitable for high-temperature and high-humidity environments.