Five reasons for aging of polyurethane color steel sandwich panel
The polyurethane color steel sandwich panel installed in the construction of high -rise buildings can play a role in protecting the insulation and heat insulation, and it is a protective effect on the outer wall that can extend the life of the brick concrete materials of the outer wall. However, as the use time is extended, the insulation material of the outer wall will also be aging, which causes the reasons for the aging of polyurethane clipplane boards? It is roughly divided into five aspects.
1. Thermal stress
The thermal expansion and contraction caused by changes in temperature differences will cause the volume change of non -structural structure, so that it is always in a state of instability. Therefore, thermal stress is one of the main destructive power of polyurethane sandwich panel outside the high -rise building exterior wall. Compared to multi -storey or bungalow buildings, high rise buildings have stronger heat stress and greater deformation due to the stronger sunlight in the outer floor. Therefore, in the design of the insulation and cracking structure, the selection of thermal insulation materials should meet the principle of flexible gradient, and the deformation capacity of the outer material should be higher than the deformation ability of the inner material.
2. Wind pressure
Generally speaking, the positive wind pressure generates thrust, and the negative air pressure generates suction, which will cause great damage to the polyurethane color steel sandwich panel on the high -rise insulation layer of the high -rise building. This requires the external insulation layer to have considerable anti -wind pressure resistance, and as far as the wind resistance is concerned, the insulation layer is required to have no vacuum cavity to prevent the air layer, so as to avoid The volume of the layer expands and causes damage to the thermal insulation layer.
3. Seismic force
Earthquake power will cause the squeezing, cutting or distortions of the high -rise building structure and the insulation surface layer, and the greater the rigidity of the thermal insulation surface layer, the greater the earthquake force, and the more severe the damage causes. This requires that under the premise of considerable adhesion of the exterior wall of high rise buildings, the principle of flexible gradient must be met to decentralize and eliminate earthquake stress to reduce the load on the surface of the insulation layer to prevent insulation under the influence of seismic force under the influence of seismic force Large -scale cracking, peeling and even falling off.
4. Water or water steam
In order to avoid the destruction of high rise buildings for water or water steam, external insulation materials with good water -having water and good water steam penetration should be selected to avoid water or water vapor during migration. The phenomenon improves the rain -resistant erosion of high -rise building insulation and antifreeze.
5. Fire
High rise buildings have higher fire prevention levels than multi -story buildings. The insulation layers of high rise buildings should have a better fire resistance function, and should have the characteristics of preventing fire spread and preventing the release of smoke or toxic gases under fire. The strength and volume of the material cannot be reduced too much, and the surface layer has no burst and no collapse. Otherwise, it will cause harm to residents or firefighters, and it will cause great difficulties to rescue work.
