Drying method of silicon dioxide vacuum insulated panel

Abstract

The invention discloses a drying method of a silicon dioxide vacuum insulated panel and relates to the technical field of production of the silicon dioxide vacuum insulated panel. A novel drying method of combining microwaves with heated air circulation drying channel is adopted. The drying method specifically comprises the following steps that a massive silicon dioxide powder core material with a smooth surface and regular corners is prepared by the adoption of a powder processing technology; the prepared massive silicon dioxide powder core material is loaded into a cut non-woven bag, a silicon dioxide core material is formed, heating processing is conducted, and the heating processing mode comprises the steps that drying is conducted by use of the microwaves for 10-30 min at the temperature ranging from 120 DEG C to 180 DEG C, and then the silicon dioxide core material is rapidly transferred to the circulation heating channel already heated to the temperature ranging from 100 DEG C to 160 DEG C to continue drying for 5-35 min; the silicon dioxide vacuum insulated panel is prepared through packaging and vacuum-pumping for the dried silicon dioxide core material, and the heat-conducting property is tested. By means of the drying method of the silicon dioxide vacuum insulated panel, the dewatering rate reaches 0-5%, and the heat conductivity coefficient can reach 0.004-0.008 w / mk to the minimum; the microwave drying is introduced, rapid heating can be conducted on the silicon dioxide core material, the drying time is greatly shortened, and the drying efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of production of silicon dioxide vacuum heat insulation panels, in particular to a drying method for silicon dioxide vacuum heat insulation panels. Background technique [0002] Vacuum insulation panels (VIP) have attracted extensive attention due to their low thermal conductivity, high temperature resistance, environmental protection and energy saving. As we all know, the porous structure of fumed silica, high specific surface area, and the ability to self-adsorb the gas inside the product have made it the preferred material for VIP core materials. Vacuum insulation panels (VIP-FS) with fumed silica as the core material are mainly produced by core material mixing, compression molding, pre-assembly, drying, vacuuming and other processes, among which drying has a negative impact on the performance and cost of the product. Significant influence. Studies have shown that with the increase of moisture in the co...

AI Technical Summary

Problems solved by technology

However, microwave heating is carried out in a closed space, which is not conducive to the loss of water and affects the drying effect of the product.

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