Polyurethane sandwich board has an indispensable use in our daily life, so what are its characteristics?
Features:
1. Hard polyurethane has low thermal conductivity and good thermal performance; When the bulk density of rigid polyurethane is 35 ~ 40kg/m3, the thermal conductivity is only 0.018~0.023w/(m.k), about equivalent to half of the extruded board (EPS), is the current thermal conductivity of all thermal insulation materials is very low.
2. hard polyurethane has moisture-proof, waterproof performance; Hard polyurethane has a closed porosity of more than 95%, which belongs to hydrophobic materials. It will not increase thermal conductivity due to moisture absorption, and the wall will not seep water.
3. hard polyurethane fire, flame retardant, high temperature resistance; After the addition of flame retardant, polyurethane is a kind of refractory self-flameout material, its softening point can reach more than 250 degrees Celsius, and it will decompose only at higher temperatures: in addition, polyurethane will form a carbonization layer on the surface of its foam when it burns, which helps isolate the foam below and can effectively prevent the spread of fire. Moreover, polyurethane does not produce harmful gases at high temperatures.
4. because polyurethane sheet has excellent heat insulation performance; Under the same thermal insulation requirements, the thickness of the outer protective structure of the building can be reduced, thus increasing the indoor use area.
5. strong deformation resistance; Not easy to crack, finish stable and safe.
6. The porosity structure of polyurethane material is stable; Basically closed cell structure, not only good thermal insulation performance, but also freeze-thaw resistance, sound absorption. The average life of rigid foam polyurethane insulation structure can reach more than 30 years under the condition of normal use and maintenance. It can be achieved in the life of the structure under normal service conditions, dry, wet or electrochemical corrosion, as well as due to insects, fungi or algae growth or damage by rodents and other external causes, will not be damaged.
7. High comprehensive cost performance; Although the unit price of rigid polyurethane foam is higher than that of other traditional insulation materials, the increased cost will be offset by a significant reduction in heating and cooling costs.