1. Material selection and property compatibility
Core material system
Polyimide (PI) : With a temperature resistance of over 300℃, it features excellent mechanical strength, electrical insulation and chemical stability, making it suitable for extreme high-temperature scenarios such as aerospace engine blades and electronic component packaging.
Polytetrafluoroethylene (PTFE) : With a temperature resistance of 260℃, it is resistant to chemical corrosion and has a low coefficient of friction. It is widely used for sealing chemical equipment and protecting high-temperature pipelines.
Fluoroethylene propylene (FEP) : Heat-resistant and highly transparent, it is suitable for shielding protection in optical inspection scenarios.
PET/CPP composite film: PET can withstand temperatures around 200℃, while CPP can withstand temperatures up to 150℃. Through lamination, flexibility and impact resistance are enhanced, making it suitable for protecting complex-shaped surfaces such as automotive interiors and electronic product casings.
Silicone rubber series: Strong adhesion at high temperatures, but environmental friendliness needs to be taken into consideration. TPU films can achieve degradability and recyclability through modification, which conforms to the trend of green development.
2. Processing technology and technological innovation
Forming process
Casting/extrusion method: Molten material is extruded through a casting machine and then shaped by a cooling roller to achieve uniform thickness control (error ≤±5%).
Hot pressing forming: Apply high pressure at a high temperature of 80-200℃ to ensure that the protective film adheres closely to complex-shaped surfaces, such as in the hot pressing forming of automotive interior parts.
Halo treatment: Increase surface tension and enhance adhesion performance; The cutting and winding process enables efficient slitting and packaging.
Patent technology example
Production process of high-temperature resistant PET protective film By using multiple high-temperature ovens (such as 7 3m ovens), operating at a speed of 20m/min, and going through steps such as preheating (140-160℃), high-temperature baking (180-200℃), setting (140-160℃), and cooling (standing still for 40-48 hours), the thermal shrinkage rate TD≤0.041% and the surface hardness ≥4H are achieved.
3. Quality Control and Standard System
Key performance indicators
Thermal shrinkage rate: When the PET protective film is exposed to 180℃ for 30 minutes, the shrinkage rate in the TD direction is ≤0.041%.
High temperature and high humidity resistance test: High temperature 80℃/ humidity 80%RH for 48 hours, low temperature -30℃/ humidity 80%RH for 48 hours. After the test, there is no delamination, white fog or deformation.
Salt spray test: In compliance with ISO 9227 standard, the protective film of 316 stainless steel substrate shows no red rust after ≥1000 hours in 5%NaCl solution.
Surface quality: Thickness uniformity error ≤±5%, surface hardness ≥4H, surface resistance 300-500Ω.
Environmental protection and safety: Compliant with RoHS standards, prioritizing the use of recyclable materials such as recycled PET and bio-based plastics.
4. Application Scenarios and cases
Electronic manufacturing: PET protective film is used for masking gold plating on PCB boards and high-temperature welding protection. PI protective film is used for chip packaging and the protection of aerospace electronic equipment.
Automotive industry: CPP protective film is used for the protection of high-temperature components in the engine compartment and the hot-pressing molding of interior parts. PET tape is used for coating masking and insulation fixation.
Aerospace: PI protective film is used for high-temperature protection of engine blades and surface protection of satellite antennas.
Architecture and glass: PET protective film is used for surface protection during the glass melting and forming process to prevent contamination and deformation.
Chemical Engineering and Energy: PTFE protective film is used for sealing reaction vessels and protecting high-temperature pipelines. TPU film is used as the insulation layer of new energy batteries.
5. Design optimization and special considerations
Structural optimization
Ultra-thin design: Suitable for microstructure surfaces or high-precision forming, such as masking gold fingers of electronic components.
Composite structure: PET+ silicone adhesive enhances anti-static performance and prevents dust adhesion. PE+PP composite film enhances flexibility.
Heat dissipation design: Add heat dissipation fins or heat-conducting coatings to enhance thermal management efficiency in high-temperature environments.
Special environment adaptation
Corrosive environment: Titanium alloy, Hastelloy base materials or PTFE coating are selected to resist acid, alkali and salt corrosion.
High-radiation scenarios: Use radiation-resistant materials, such as lead-containing composite films, for the protection of nuclear industry equipment.