The thickness of the polyurethane sandwich panel mainly depends on the thickness of the sandwich core. The thickness of the sandwich core is different, and the thickness of the polyurethane sandwich panel is different. Polyurethane sandwich panels of different thicknesses have different uses, and the thicker the better. Now polyurethane sandwich panels are widely used in construction, let's take a detailed look at the thickness of polyurethane sandwich panels.
Polyurethane sandwich panels are bimetallic, single-metallic, and non-metallic composite panels with polyurethane rigid foam as the thermal insulation layer. They are usually used in industrial workshops, logistics storage, and integrated house walls and roof enclosure systems. If the polyurethane sandwich panel is made of color steel as the surface material, the thickness of the color steel plate is 0.4mm-1.0mm, and the thickness of the core material is 50mm-200mm.
Color steel polyurethane sandwich panel is not as thick as possible
Flame retardancy is very important: the core of the polyurethane sandwich panel is made by combining polyether and polymerized MDI (polyphenyl polymethylene polyisocyanate) for foaming reaction. The quality of the polyurethane core is not its quality. thickness, but rather its flame retardant properties. The current national standard GB 8624-2012 "Classification of Combustion Performance of Building Materials and Products" divides building materials into Class A (non-combustible materials), Class B1 (flammable materials), Class B2 (combustible materials), and Class B3 according to their flame retardancy. Class (flammable material). According to different applications, the selection of building materials should meet the requirements of low flame retardant grades required by national and local laws and regulations. Due to the characteristics of its organic materials, the polyurethane core can only reach the judgment of the flame retardant grade B1 under the current technical conditions, and there are technical bottlenecks and difficulties in the development and manufacture of the B1 polyurethane core. A few large manufacturers can do it. The polyurethane insulation boards produced by most small and medium-sized enterprises can only reach the B2 level or even the B3 level.
Improvement of flame retardancy: There are usually three ways to improve the flame retardancy of polyurethane materials: adding flame retardants, mainly phosphorus-based and halogen-based flame retardants; increasing the isocyanate index in the formula, that is, adding black materials The amount of (MDI); through the molecular structure modification technology, the flame retardant properties of the material are increased. The addition of flame retardants is likely to increase the smoke production and toxicity of polyurethane foam when burning, and with the passage of time, the flame retardants are easy to migrate and fail. Therefore, the improvement of the performance of polyurethane foam is mainly achieved by adjusting the components of the polyurethane rigid foam combination polyether. The performance of the polyurethane rigid foam combination polyether will directly affect the process performance of the polyurethane rigid foam production and the physical properties and use characteristics of the final product. Foam thermal conductivity, density, strength, hardness, flame retardant properties, etc. can be changed with the different formulations of polyurethane rigid foam combination polyether raw materials.
