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Thermal conductivity of PMI foam

Update:27-01-2021
Summary:

PMI foam is a kind of thermal insulation material and s […]

PMI foam is a kind of thermal insulation material and structural material with excellent performance. Among all kinds of polyurethane products, the output is second only to flexible foam. A highly cross-linked thermosetting material. Most of the cell structure is closed cell type, and a small amount of open cell structure rigid foam is used for special occasions. The main characteristic is its hardness and toughness. In addition, due to the difference in the amount and variety of the initiator, blowing agent, catalyst and other auxiliary agents, it also gives different properties to the rigid polyurethane foam.

 

Its excellent properties such as foamability, elasticity, abrasion resistance, low temperature resistance, solvent resistance, and biological aging resistance make it widely used in refrigeration equipment, automobiles, trains, roofs, rigid foam hollow bricks, and rigid polyurethane foam. Concrete, storage tank pipe insulation, packaging, office supplies and other fields. Generally, foam boards have a compact closed-cell structure, and the molecular structure of polystyrene itself does not absorb water, so foam boards are often used as insulation materials.

 

 

While serving as a PMI foam board, it needs to pursue a lower thermal conductivity to ensure its thermal insulation performance. The lowest possible thermal conductivity is the goal pursued by all insulation materials. The extruded board is mainly made of polystyrene, and polystyrene is originally an excellent low thermal conductivity raw material, supplemented by extrusion, the compact honeycomb structure prevents heat conduction more effectively, and the heat transfer of the shaped board The coefficient is 0.028/mk, which has the characteristics of high thermal resistance and low linear expansion rate.

 

The thermal conductivity is much lower than other insulation materials. Such as EPS board, foamed polyurethane, thermal insulation mortar, perlite, etc. If you use general rigid foam insulation materials, it will be easy to age after a few years, and the performance will gradually decrease. The use of PMI foam board can effectively prevent this from happening. As long as the maintenance is proper, the service life can be extended. Long-term performance of the work effect.