The properties of thermal insulation, heat insulation and sound absorption of color steel sandwich panel mainly depend on its core material - thermal insulation material. This kind of material should not only have good heat preservation, but also have
enough strength and rigidity, and have good adhesion with color steel plate. Only in this way, the composite plate can bear the design load and meet the requirements of building function.
The core material of color steel sandwich panels can be divided into two categories according to their chemical composition. They are organic chemical foam materials, such as polyurethane foam plastics, polystyrene foam plastics, phenolic foam
plastics, tripolyamine foam plastics, etc. The other is inorganic fiber materials, such as rock wool board, mineral wool board, glass wool board, etc.
At present, the most widely used color steel sandwich panel insulation core materials used by domestic color steel sandwich panel manufacturers are polystyrene sandwich panel (EPS sandwich panel), rigid polyurethane sandwich panel (PU sandwich
panel), rock wool sandwich panel, namely RW sandwich panel. But polyurethane, polystyrene and other organic materials have low heat-resistant temperature, easy to burn in case of fire, and easy to produce toxic gas, which has become one of the main factors
of fire accidents.
In recent years, people have paid more attention to building fire protection. Because of the use of insulation materials with poor fire performance, fire events are also emerging in an endless stream. For example, on February 9, 2009, there was
a huge fire accident in the cultural center of the new CCTV site, which was caused by the use of combustible materials and unqualified insulation boards in the construction in progress. Therefore, the national government attaches great importance to it.
On September 25, 2009, Article 2 of Chapter 1 of the Interim Provisions on external insulation system and external wall decoration and fire protection of civil buildings jointly issued by the Ministry of public security and the Ministry of housing and
urban rural development of the people's Republic of China clearly stated: "the combustion performance of external insulation materials of civil buildings should be class A, and should not be lower than class B2", while Article 11 of Chapter 4 states:
"for temporary residential buildings For the built metal sandwich composite plate, the core material shall be non combustible or non combustible insulation material ".
However, the commonly used color steel sandwich panels insulation core material -- polyurethane foam itself is not fireproof, and a large amount of smoke generated after combustion contains hydrogen cyanide, which is harmful to human health. The
polyphenylene board in addition to non fire, after a long time will shrink outside the insulation performance is also very poor. Polystyrene foam and polyurethane foam are flammable, not high temperature resistant, seriously affecting the quality of building
engineering and fire safety, are currently being restricted by the fire department. Although rock wool, glass wool and other inorganic mineral wool materials can meet the fire protection requirements, they are not friendly to the environment (the floating
cotton in the construction process is harmful to human body), easy to breed bacteria, high water absorption, poor heat insulation effect, and the strength is not good enough, with short service life.