At present, with the rapid development of society and the sharp increase of carbon emissions, the greenhouse effect is very prominent. Therefore, energy saving and emission reduction, and the development of green and efficient thermal insulation materials are extremely important and urgent. Since building energy consumption accounts for about 1/3 of the total social energy consumption, it is of great significance to use safe and efficient thermal insulation materials to reduce building energy consumption. As a new type of high-efficiency thermal insulation material, vacuum insulation panel (VIP) for building has excellent thermal insulation performance, and its thermal conductivity can be as low as 1.5 mW/(m·K). The thickness of the thermal insulation board can reach one-tenth of other traditional thermal insulation materials, which can save a lot of space. It is a more efficient and advanced building thermal insulation material at present. The vacuum insulation panel is mainly composed of three parts: core material, barrier film and getter. The core material is an important part of the vacuum insulation panel, it is its skeleton, plays a supporting role, and is also a key factor determining its thermal insulation performance. So what types of core materials are there for vacuum insulation panels? What are the characteristics of each? The following is a brief introduction to the core material of the vacuum insulation panel.
The core material of the vacuum insulation panel is usually a porous structure material with high heat conduction barrier properties to ensure that the core material maintains a low solid heat conduction. The movement space of the gas. The smaller the pore size of the core material, the more uniform the distribution, and the more favorable it is to improve the thermal insulation performance and life of the vacuum insulation panel. Therefore, we use some high-quality lightweight core materials with low cost, high thermal resistance and better microstructure as the core materials of vacuum insulation panels. There are many types of core materials, mainly including particle core materials, foam core materials, fiber core materials and composite core materials. These different core materials have different effects on thermal insulation performance. In the process of development, due to the high cost and complex preparation process, the application of particle core materials has been limited to a certain extent; the foam core material has been eliminated due to its poor flame retardancy; the fiber core material has been widely used due to its wide source of raw materials and simple process. Large-scale industrial application. The core material is an important part of the vacuum insulation panel, and the quality of the core material plays a decisive role in the influence of the thermal insulation performance. Therefore, the research, development and improvement of core materials have been mainly focused on how to reduce gas residues in core materials and reduce solid heat transfer. Through research, it has been shown that the thermal insulation board using hybrid composite core material has better thermal insulation performance and longer service life than the vacuum board using glass fiber core material or particle core material alone, which may be the core material of high-performance vacuum thermal insulation board in the future. inevitable trend of development.
