Vacuum heat insulation plate for gas-phase silicon dioxide applications.

Gas phase silica, also known as gas phase method white carbon black, molecular type: SiO2, is a gradually recognized and widely used nano-powder material. At present, gas phase silica has been used in silicone rubber, adhesives, ink coatings, resin composites and many other fields.
with the iterative update of technology and the expansion of downstream applications, this inorminable nanomaterial known as "industrial MSG" still has unlimited potential for industry

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years, the state has vigorously advocated the promotion and application of green energy-saving buildings and industrial energy-saving materials, in the thermal insulation industry, vacuum and porous materials as the core of the vacuum insulation plate has become a new popular product.the
vacuum insulation plate can effectively avoid the heat transfer caused by air convection, has a low thermal conductivity of less than (0.035w/(m2.k), and does not contain any ODS materials, with environmental protection and energy-efficient properties, is currently the world's most advanced high-efficiency insulation materials. At present, it is mainly used for insulation, such as household refrigerators, yacht refrigerators, mini-refrigerators, car refrigerators, deep cold freezers, electric water heaters, vending machines, freezers, refrigerated containers, building wall insulation and LNG storage and transportation.
vacuum insulation plate is generally composed of core material, diaphragm and suction agent (desiccant) three parts, in the vacuum insulation plate, the choice of core material is the key factor to determine the performance of the vacuum insulation plate.
the selection of vacuum insulation plate core, there are glass cotton, microsilicon powder, aerogel, gas phase silicon dioxide and so on. At present, due to cost technology and other factors, the use of glass cotton, micro-silicon powder as a core material generally short life, unstable production quality, serious loss of sealing edge heat and other phenomena, and aerogel although the performance is good, but because of the high cost, it is not conducive to vigorous promotion. Among the many options, gas-phase silicon dioxide has become the preferred nanomaterial for the preparation of high-end vacuum insulation plate cores due to its unique characteristics and relative cost advantages.
First, gas-phase silica is a micro-fine nanomaterial, the primary particle size is only 7-40nm, and higher than the surface area, can reach 400m2/g, so its aggregate and particles inside the gap is very small, and the pore rate is relatively high; The three-dimensional branch-like silicon dioxide aggregate, which is then connected by a hydrogen bond and van der Waal force, forms a silicon dioxide appendate, thus having a smaller volume density (accumulation density of 30-60g/L), and the gas phase silicon dioxide itself is prepared at high temperatures (1200-2100 degrees C), so it has high temperature resistance. Finally, the molding process is relatively simple, directly mixed with infrared masking agents, adhesives, enhancer and other additives can be molded. Compared with core filling materials such as aerogels, gas-phase silicon dioxide has obvious advantages in production cost, productivity, electrical performance, thermal stability and service life.
with the development of science and technology, the application field of gas-phase silica has been continuously developed. Under the background of promoting green, environmental protection and energy saving in the country, vacuum insulation plate made of gas-phase silicon dioxide as the core material will play a great role in the field of energy-saving buildings.
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