What is the thermal insulation principle of graphite polystyrene board?
Publish Time: 2024-12-15
As an efficient thermal insulation material, graphite polystyrene board has excellent thermal insulation performance due to the synergistic effect of many principles.
First of all, the basic material of graphite polystyrene board is polystyrene, which is an excellent thermal insulator. Its molecular structure is relatively stable, and the internal macromolecular segments hinder the conduction of heat through molecular vibration. The added graphite particles further significantly improve the thermal insulation effect. Graphite has a unique crystal structure and presents layered graphite flakes. These graphite flakes can form a similar "thermal barrier network" in the polystyrene matrix. When heat encounters graphite flakes during the transfer process, it needs to bypass the flakes or conduct heat slowly along the flakes, which greatly increases the path and difficulty of heat propagation, thereby effectively reducing the efficiency of heat conduction.
From a microscopic point of view, the addition of graphite changes the thermal conduction mode inside polystyrene. In ordinary polystyrene, heat is mainly transferred gradually through collisions between molecules. In graphite polystyrene board, the high thermal conductivity of graphite is reflected in the direction of its own sheets, while the thermal conductivity in the vertical direction is poor, so that when heat encounters graphite sheets, it is more dispersed and deflected, and it is difficult to form a straight heat flow to quickly penetrate the material. For example, in the winter when it is cold outside and warm inside, graphite polystyrene board can effectively prevent indoor heat from being lost to the outside through the wall, so that the indoor temperature environment is relatively stable, and the energy consumption of heating equipment is reduced.
In addition, the closed-cell structure of graphite polystyrene board also plays a key role in heat preservation. It contains a large number of tiny closed cells inside, which are filled with air. Air is a natural thermal insulator, and the heat conduction speed between air molecules is very slow. The closed-cell structure effectively seals the air in the board body, preventing the convection heat exchange of the air, and further cutting off the heat transfer path. This multi-layer insulation system composed of polystyrene matrix, graphite particles and closed-cell structure enables graphite polystyrene board to exhibit extremely outstanding insulation performance in the field of building insulation, laying a solid material foundation for achieving energy conservation and emission reduction in buildings and creating a comfortable environment.
