Briefly describe the five factors that cause the aging of exterior wall insulation materials

1. Thermal stress. Because the outer layer receives more sunlight, the thermal stress is larger, and the deformation is larger. Therefore, when the thermal insulation crack-resistant structure is designed, the insulation material should meet the principle of flexible gradation, and the deformation ability of the outer material should be high. The ability to deform the inner layer of material.

2, wind pressure. Positive wind pressure produces thrust, negative wind pressure produces suction, and it will cause great damage to the outer insulation layer of high-rise buildings. This requires that the outer insulation layer should have considerable wind pressure resistance, and the insulation layer is required to have no cavity. , to prevent its air layer.

3. Earthquake force. Seismic forces can cause the structure and insulation surface of high-rise buildings to be squeezed, sheared or distorted. The greater the rigidity of the insulation surface, the greater the seismic force it will with, and the more serious the damage will be. This requires that the external thermal insulation material of the high-rise building must meet the principle of flexible gradual change under the premise of considerable adhesion, in order to disperse and absorb the seismic stress and minimize the load on the surface of the thermal insulation layer.

4. Water or steam. In order to avoid the damage of high-rise buildings caused by water or water vapor, external insulation materials with good water repellency and good water vapor permeability should be selected to avoid the condensation of water or water vapor during the migration process or the increase of water content inside the insulation layer. Phenomenon, improve the resistance to rain and water erosion and freeze-thaw resistance of the outer insulation layer of high-rise buildings.