Practice of vacuum plate

At present, the global thermal insulation materials are developing in the direction of high efficiency, energy saving, thin layer, thermal insulation and waterproof. At present, in China, traditional thermal insulation materials such as rock wool, glass wool and expanded perlite still occupy the main market. Although these materials are relatively low in price, they have high density, poor thermal insulation performance, high moisture absorption, poor seismic performance and poor environmental protection performance. In addition, the use of these thermal insulation materials cannot meet the energy-saving standards. Compared with traditional thermal insulation materials, aerogel is a porous nano-material with high specific surface area, high porosity, low bulk density and lower thermal conductivity than room temperature air. Because aerogel has a unique nano-structure, it can achieve energy-saving, light weight and high efficiency when used as thermal insulation material. Vacuum insulation board (VIP board) is a kind of super-thermal insulation material. Because of its extremely low thermal conductivity, it has the advantages of thin insulation layer, small volume and light weight when meeting the same thermal insulation technical requirements. It is suitable for occasions with high energy saving requirements and small volume and light weight of insulation materials, which has great technical and economic significance. The application of aerogels in the field of vacuum panels has been studied. For example, China technical patent 2425347.2 discloses a vacuum insulation panel, which comprises a shell and an insulation core material arranged in the vacuum shell, wherein the core material comprises silica aerogels and glass fibers, and the glass fibers are interwoven between the silica aerogels, and an infrared reflecting layer is arranged on the surface of the core material; The shell layer is a laminated bag or a hard metal or glass plate. However, in the prior art, the thermal insulation performance has not been improved and the service life is limited. In order to improve the thermal insulation performance of the board, it has become a research hotspot to improve the thermal conductivity of VIP products by reducing the core density.