Technology | application of thermal insulation materials in metal enclosure system

The sixth national metal enclosure system industry conference was held in Suzhou from March 27 to 29, 2019. Hu Xiaoyuan of thermal insulation branch of China Silicate Society made a report at the meeting and discussed the impact of thermal insulation materials on metal envelope from a professional perspective.

Background: metal enclosure system is widely used

With the rapid development of national economy, the building envelope system with color steel, aluminum magnesium manganese alloys as panels and thermal insulation, heat insulation and sound-absorbing materials as core materials, which has the advantages of convenient construction, beautiful form, high performance and durability, has been widely used in China's construction engineering. Each construction area in China is more than 200 million square meters, and the application fields include public buildings, industrial plants Housing and other aspects.

Therefore, in order to make metal buildings meet the requirements of safety, reliability, beauty, green and environmental protection, the application research of durability, fire and water resistance, thermal insulation and acoustic performance of metal maintenance system has attracted more and more attention.

Overview of thermal insulation materials:

Thermal insulation materials generally refer to materials with thermal conductivity less than or equal to 0.12W / (m · K) at 25 ° C and can prevent the flow of heat (energy).

Main functions of thermal insulation materials in steel structure buildings:

• energy saving: energy saving is achieved by reducing the loss of heat or cold energy

• anti condensation: increase the surface temperature and prevent the condensation of water vapor on the cold surface

• indoor comfort: reduce the impact of external temperature on the indoor, so as to be warm in winter and cool in summer

• sound absorption and noise reduction: thermal insulation material is also a good acoustic material, which can absorb sound internally with veneer or perforated plate, and sound insulation externally with roof and wall panel.

Classification of thermal insulation materials

• organic thermal insulation materials, such as polyurethane (PU, PIR), polystyrene board (EPX, XPS), phenolic board (PF);

Inorganic insulation materials, such as: glass wool, rock wool, foam glass, microporous calcium silicate, aluminum silicate and perlite;

• various materials have suitable application scenarios. In metal roof buildings, inorganic thermal insulation materials are widely used, mainly glass wool and rock wool, which are non combustible class a materials.

Main thermal insulation materials for different metal enclosure systems:

• single / double-layer profiled metal plate composite insulation roof, glass wool

Single layer waterproofing membrane, thermal insulation metal roofing, rock wool, polystyrene board + fireproof board, foam glass.

Special-shaped roof, rock wool, glass wool, polystyrene board + fireproof board, foam glass.

• prefabricated cold storage, polyurethane (PU / PIR), XPS

Three factors affecting the thermal conductivity of rock wool and glass wool

• fiber diameter is the key. The finer the fiber diameter, the smaller the thermal conductivity

• product density is an important consideration for selection

• the average temperature is not a physical parameter, but it also has an effect