How to improve the flexibility and durability of 0.25mm ultra-thin PC optical film?
Publish Time: 2025-03-13
Polycarbonate (PC) optical film has been widely used in many fields such as optical display, electronic devices and lighting due to its excellent light transmittance, weather resistance and processing performance. Especially in ultra-thin specifications (such as 0.25mm), PC optical film has shown its unique advantages. However, ultra-thin PC optical film still faces certain challenges in flexibility and durability. This article aims to explore how to improve the flexibility and durability of 0.25mm ultra-thin PC optical film through a series of technical means.For the improvement of flexibility, we can start from two aspects: material formulation and processing technology. First, in terms of material formulation, by adding an appropriate amount of toughening agent, such as rubber toughening agent (such as nitrile rubber NBR) or thermoplastic elastomer toughening agent (such as styrene-butadiene-styrene block copolymer SBS), the toughness of PC film can be significantly improved. These toughening agents form an "island structure" in the PC matrix, which can effectively absorb energy and prevent brittle fracture when the film is subjected to external force. At the same time, the amount of toughening agent added needs to be strictly controlled to avoid affecting other properties of the film, such as hardness and light transmittance.Secondly, in terms of processing technology, by optimizing the preparation process of the film, such as adjusting the stretching ratio and temperature, the arrangement and orientation of the PC molecular chain can be improved, thereby improving the flexibility of the film. In addition, the use of multi-layer co-extrusion technology to co-extrude PC materials with different properties or other polymer materials can also form a composite material with excellent flexibility.The improvement of durability depends more on surface treatment and material modification. On the one hand, coating the surface of PC optical film, such as coating with fluoropolymer coating or acrylate coating, can significantly improve the wear resistance, scratch resistance and weather resistance of the film. These coatings can form a protective layer to isolate ultraviolet rays, oxygen and moisture in the external environment, thereby extending the service life of the film.On the other hand, through material modification, such as adding nanoparticles (such as nano titanium dioxide TiO₂ or nano calcium carbonate CaCO₃), the mechanical properties and thermal stability of PC film can be enhanced. Nanoparticles act as physical crosslinking points in the PC matrix, which can limit the movement of molecular chains and improve the toughness of the film. At the same time, nanoparticles can also induce more silver streaks and shear bands, consume energy, and further improve the impact resistance of the film.In addition, surface modification of PC optical film, such as plasma treatment or chemical etching, can also improve the surface properties of the film and improve its adhesion to adhesives or other materials, thereby enhancing the durability of the film.In summary, the flexibility and durability of 0.25mm ultra-thin PC optical film can be significantly improved by optimizing material formulation, improving processing technology, surface treatment and material modification. The implementation of these strategies will provide strong support for the application of ultra-thin PC optical film in a wider range of fields.
