1. Peeling treatment. The skin of the ordinary extruded board is smooth, and the adhesion of the skin to the adhesive and the plaster is poor. On the one hand, the surface can be evenly and advantageously bonded, and the tensile bond strength, water resistance and freeze-thaw resistance of the adhesive and the plaster are both above 0.25 MPa, which greatly improves the adhesion of the system and increases the reliability. On the other hand, a certain amount of internal stress is uniformly released by the peeling treatment.
2. National standard situation. The application of extruded boards does not yet have a national standard. As a result, many applications borrowed the technical standards for expanding polystyrene boards. In June 2009, Shanghai Academy of Sciences and the National Building Standard Design Institute jointly organized the technical standards for the extrusion of the plastering exterior wall insulation system. At the same time, the national standard 08CJ16 “Extrusion plate insulation system building structure†prepared by Knauf Company It was also revised in the National Building Standard Design Institute in August 2009. Efforts are being made in the industry to strengthen the application specifications and standards for extruded boards to ensure the rational use of extruded boards in exterior insulation.
The national standard stipulates that the dimensional stability of the peeled extruded board is ≤2.0%. Knauf has done some research on this point. By setting the expansion joint in a certain area by the external thermal insulation system, the system can effectively release the layers. The deformation.
3. Dimensional stability. In the industry, it is considered that the extruded board is used for external thermal insulation. Due to the poor dimensional stability, the size of the extruded board may be deformed due to the influence of the weather, and eventually the coating of the finish layer is cracked, which is not as good as the EPS system. In fact, we can see from the elastic modulus of the three materials in the system, the mortar is about 15500MPa, the EPS is about 4-6MPa, and the XPS is about 7-9MPa. Although the EPS elastic modulus is slightly smaller than the XPS, compared with the mortar elastic modulus, the EPS and the XPS extruded board are all of the same order of magnitude, and the constraints of the materials are not substantially changed. There is no claim that the mortar is more constrained by EPS than the XPS, and many engineering examples have confirmed this effect.
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