Nano composite core material of energy accumulating vacuum insulated panel and preparation method thereof

Abstract

The invention discloses a nano composite core material of an energy accumulating vacuum insulated panel and a preparation method thereof. The formed bulk density of the composite core material is in the range from 0.11 to 0.35 g / cm<3>; the composite core material is composed of a nano powder, phase-change energy accumulating microcapsules, a radiation blocker, organic fibers and a binder in a weight ratio of 100: (10-45): (0.2-10): (8-20): (0.01-0.5), wherein the nano powder is nanoparticles covered with a modifier. The method for preparing the nano composite core material comprises the following steps of: spraying modification solution obtained by mixing the modifier with ethanol and water to the nano particles and stirring evenly, and then drying the nano particles covered with the modifier to obtain the nano powder; next, evenly mixing the nano powder with the phase-change energy accumulating microcapsules, the radiation blocker and the organic fiber, and then spraying the binder to the mixture and mixing evenly to obtain a composite material; in addition, putting the composite material in a die for mould pressing, and drying the composite material at different temperatures in a gradient way, thus obtaining the target product. The normal-temperature heat conductivity coefficient of the nano composite core material is lower than 0.02 W / m.K; and therefore, the nano composite core material can be used as a filler core material and widely applied to the vacuum insulated panels.

Description

technical field [0001] The invention relates to a nanocomposite core material and a preparation method thereof, in particular to an energy storage type vacuum heat insulation board nanocomposite core material and a preparation method thereof. Background technique [0002] Vacuum insulation panel is a kind of vacuum insulation material. It is composed of filling core material and vacuum protection surface layer. It can effectively avoid heat transfer caused by air convection and greatly reduce its thermal conductivity to less than 0.005W / m·K. Recently, people have made various efforts in order to obtain the filling core material in the vacuum insulation panel, such as "a kind of silicon dioxide-rich Nanocomposite inorganic flame retardant thermal insulation board and its preparation process". The insulation board mentioned in this specification is a flat or special-shaped inorganic nanocomposite board, which is composed of 40-80% by weight of silica powder, 10-30% of zirco...

AI Technical Summary

Problems solved by technology

However, no matter it is the final product or its preparation process, there are deficiencies. First of all, although the thermal conductivity of the insulation board as the final product is low at room temperature, it is still not satisfactory, and it is difficult to use it with a high insulation board. Second, the preparation process not only requires more raw materials, which increases the complexity, but also cannot produce thermal insulation materials with lower thermal conductivity at room temperature