The key to architectural membranes' ability to achieve multiple functions such as heat insulation, energy saving, safety, UV protection, and aesthetics lies in their scientifically sound composition methods and precise composite processes. This method uses a polymer substrate as a carrier, employing ordered layering and functional coating implantation to allow different materials to leverage their respective advantages through structural synergy, resulting in a finished product with balanced performance and flexible applications.
The first step in this composition method is determining the substrate layer. Substrates are typically selected from polyester (PET), polyvinyl chloride (PVC), polyvinyl fluoride (PVF), or fluorocarbon resin films, chosen based on the target product's weather resistance, strength, flexibility, and cost requirements. PET substrates offer high transparency and good dimensional stability, making them suitable for energy-saving films with stringent optical performance requirements; PVC substrates excel in weather resistance and tensile strength, commonly used in large outdoor curtain walls or safety films; fluorocarbon substrates exhibit excellent resistance to chemical corrosion and aging, making them suitable for harsh climatic environments. Before being incorporated into the composite process, the substrate undergoes surface corona or plasma treatment to enhance the adhesion of subsequent coatings and adhesive layers.
The second step is the application of the functional coating, a crucial step that determines the core performance of the architectural membrane. Depending on the product positioning, techniques such as vacuum magnetron sputtering, electron beam evaporation, or chemical vapor deposition can be used to form a metallic or metal oxide reflective layer on the substrate surface. This achieves efficient blocking of infrared and ultraviolet radiation, forming the basic framework of a low-emissivity (Low-E) heat insulation film. For products requiring dimming or privacy control, electrochromic or liquid crystal microcapsule layers can be introduced into the coating system to adjust light transmittance through changes in electric field or temperature. UV protection is often achieved by adding inorganic UV absorbers or organic UV blockers to the surface layer to protect the indoor environment and the membrane material itself. The coating thickness and uniformity must be precisely controlled to avoid pinholes, color differences, or optical interference streaks.
The third step is the configuration of the adhesive layer. The adhesive layer not only serves to bond the functional membrane to glass or other substrates but also affects the membrane's temperature resistance, shock resistance, and removability. Commonly used pressure-sensitive adhesives (PSA) use acrylic or rubber as a base, achieving reliable bonding under both room temperature and heating conditions. They can be designed to be removable for easy replacement without damaging the glass surface. For safety films, the adhesive layer needs higher cohesive strength and ductility to effectively restrain fragments in the event of glass breakage.
The fourth step is the protective layer and surface treatment. To improve wear resistance, stain resistance, and scratch resistance, a hardened resin layer or nano-ceramic coating is often applied to the film surface, followed by UV curing to form a robust and durable outer film. Some products also have UV-resistant edge sealing strips applied to the edges or specific areas to prevent edge degradation under prolonged sunlight exposure.
The lamination sequence is typically: substrate → functional coating → adhesive layer → protective layer. Each layer is tightly bonded using hot-press rolling or vacuum adsorption to ensure no air bubbles or displacement between layers. Online optical and mechanical performance testing is performed before winding. For different applications, a mesh reinforcement layer or decorative layer can be embedded during the lamination process to achieve structural reinforcement or aesthetic customization.
In summary, the composition method of architectural membranes focuses on substrate selection, precise implantation of functional coatings, matching of adhesive layers, and surface strengthening treatment. Relying on mature film processing and composite technology, it organically integrates the properties of various materials, ensuring both the functional diversity of the product and the construction adaptability and long-term service stability, providing a reliable technical path for the performance upgrade of modern building envelopes.