Introduction of rigid polyurethane：
Rigid polyurethane has excellent properties such as light weight, low thermal conductivity, good heat resistance, aging resistance, easy bonding with other substrates, combustion without droplets, etc., and has broad prospects for application in building materials.
At now, rigid polyurethane has been widely used as a building insulation material, and its application technology is quite mature. Worldwide, rigid polyurethane has become dominant in the field of building insulation.
At present, about 49% of modern building insulation materials are polyurethane materials, which are mainly used for exterior wall insulation. This increases the usable area inside the building. At the same time, rigid polyurethane has broad applications in roof insulation and waterproofing, as well as thermal insulation in cold storage / cold room, greenhouses, grain warehouses and so on.
Features of polyurethane cold storage panels:
1. The sandwich panel for cold storage improves the insulation and airtightness of the joints of the panel, and the installation is more convenient.
2. The PU sandwich cold storage panels is uniform and stable, and the heat insulation performance is good.
3. Light weight, generous appearance, effectively solve the problem of poor control of temperature difference inside and outside the cold storage.
4. The size of the cold storage can be freely changed in the three directions of length, width and height, and can be expanded or reduced according to needs, and the assembly panel can also be disassembled and recycled, and the installation is simple and fast.
5. Polyurethane foam, with environmental protection, anti-corrosion, flame retardant, moisture-proof, good thermal insulation performance and other characteristics.
6. Using advanced equipment for foaming, the finished product has high uniformity, and the general standard bulk density is 40±2kg/m³.
7. Polyurethane 50mm cold room panel has a strong flame-retardant effect, and it is safer in cold storage.
(1) There is a flame retardant in the polyurethane sandwich panel for cold storage, which will be automatically extinguished after leaving the fire source, and its softening point can reach more than 250 °C.
(2) Polyurethane will form ash on its foam surface when burned, which can effectively prevent the spread of fire.
(3) Polyurethane does not produce harmful gases at high temperatures.
8. Polyurethane 50mm cold room panel has good thermal insulation effect, which can make cold storage more energy-saving.
9. Polyurethane sandwich panel for cold storage has a long service life, strong deformation resistance, will not easily crack, not only thermal insulation performance, sound absorption and other effects. Under the normal use conditions of cold storage, the average life of rigid polyurethane insulation panel is as high as more than 30 years.
Physical and mechanical properties of polyurethane foam | ||
Metric name | unit | Indicator value |
density | kg/m³ | 40±2 |
Thermal conductivity | W/(m.k) | ≤0.024 |
Dimensional stability | (+70°C~-30°C,48h)% | ≤3 |
compressive strength | kPa | ≥160 |
Water absorption | (V/V)% | ≤4 |
Combustion performance (horizontal combustion method) | Average burn time (s). | ≤90 |
Average combustion range (mm). | ≤50 | |
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