1. Different foaming mechanism The rigid foam polyurethane is a two-component liquid (commonly known as black and white material), which is mixed thoroughly to produce a rapid chemical reaction (tens of seconds to several minutes). In the foaming agent, catalyst, and foaming. A lightweight foam which is foamed into a high closed cell ratio of >90% and has a network structure under the action of an additive such as a solvent, and is a thermosetting foam. Polystyrene foam (EPS, XPS) is a foam that is swollen by heating of pellets or powders, vaporized and expanded by a foaming agent, and formed by a die or extrusion machine. It has a granular structure and belongs to a thermoplastic foam. Higher sensitivity, the potential for secondary foaming.
2, the physical properties of the foam are different
1. Thermal insulation properties The polystyrene foam has good thermal insulation properties, but the lambda value is relatively large compared with the rigid foam polyurethane, such as EPS plate λ≈0.04w/k·m, XPS plate λ≈0.031 w/k·m. , and the PUR plate λ ≈ 0.022 w / k · m. Under the premise of the same energy-saving index, the thickness of the insulation board can be reduced, and the quality stability of the insulation system can be improved.
2, the thermal stability of the rigid foam polyurethane can be as high as 120 ° C, while the benzene board is only 70 ° C. The outer surface temperature of the outer wall of summer in China is generally above 70 ° C or above 70 ° C. Such a temperature can easily cause secondary foaming of the benzene board, resulting in cracking of the joint.
3, surface binding energy polyurethane molecular chain has a certain -OH bond, that is, hydrophilic gene, easy to bond with cement-based slurry, while polystyrene does not have -OH bond, is a hydrophobic material, its surface is difficult to The inorganic materials such as cement-based slurry are combined, which is one of the main reasons for the cracking, hollowing and falling off of the benzene board external thermal insulation system.
4. Combustion-based rigid foam polyurethane is a thermosetting material. After being burned by heat, it forms a carbonized layer, which blocks the further intrusion of heat and oxygen, hinders further combustion of the foam, and is less prone to fire spread accidents. Polystyrene foam is a thermoplastic material that shrinks and melts after being heated, and then drops and burns. It does not produce a carbonization barrier layer, which is prone to flame spread and flashover accidents.
5, corrosion resistance polyurethane resistant to water, oil, solvent. Polystyrene is water resistant but not solvent resistant. It is extremely sensitive to benzene and ester solvents and is prone to rapid corrosion.
3, the application of different types of polystyrene foam can only enter the molding and extrusion foam molding in the factory state, and the rigid foam polyurethane can be sprayed, cast and factory foamed, so the application and application areas are better than Styrene foam is diverse and convenient.
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