Microporous insulation board is a highly efficient thermal insulation material manufactured by directly pressing nano-silica with appropriate additives through a special dry-pressing process.
Due to its unique nano-microporous structure and the synergistic effects of various additives, this material significantly suppresses heat conduction, convection, and radiation within different temperature ranges. This property sets it apart as far superior to all conventional insulation materials, such as mineral wool, rock wool, insulation bricks, calcium silicate, ceramic fibers, etc. It even surpasses products like aerogel blankets, as the thermal conductivity of microporous insulation boards is lower than that of stagnant air in most temperature ranges.
Comparison of Thermal Conductivity Between Microporous Insulation Board and Traditional Thermal Insulation Materials
The transfer of heat from a high-temperature area to a low-temperature area occurs through three fundamental mechanisms: conduction, convection, and radiation. In many manufacturing processes, all three mechanisms act simultaneously, resulting in the overall heat transfer effect. To achieve efficient insulation, it is essential to concurrently suppress these three heat transfer processes.
1. Conduction
Conduction occurs during the transfer of heat in solids, liquids, and gases as a form of thermal motion within materials, carried out by the kinetic energy of molecules and atoms. In microporous insulation boards, heat conduction primarily involves the transfer of heat between solids. Due to the molecular structure of the microporous material and the spherical nature of particles, the contact points between particles are exceedingly small. This results in very low heat conduction between solid particles.
2. Convection
In the heat transfer process, gas molecules collide and transfer kinetic energy to each other. However, in microporous materials, the collision between gas molecules is impeded, resulting in a significant reduction in heat transfer between gases.
Under standard conditions, the typical mean free path of gas molecules is approximately 93 nanometers. However, the primary component of microporous insulation typically comprises ultrafine amorphous silica particles with a pore size of around 20 nanometers, significantly smaller than the mean free path of gas molecules. As gas molecules collide with the walls of the micropores, the exchange of energy between individual molecules is thereby minimized.
3. Radiation
Thermal radiation is generated by electromagnetic waves and significantly increases with rising temperatures. Adding infrared opacifiers within the microporous material matrix can greatly reduce this form of heat transfer.
The Principle of Microporous Insulation Board
By minimizing heat transfer through conduction, convection, and thermal radiation between solids to the greatest extent, the insulating effect of microporous insulation materials surpasses that of any other traditional insulation materials, such as mineral wool, insulation bricks, or inorganic insulation boards.
