Multi-layer glass fiber insulation board and preparation process thereof

The invention relates to the technical field of heat insulation plates, in particular to a multi-layer glass fiber heat insulation plate and a preparation process thereof. According to the specific scheme, the preparation method comprises the following steps: S1, preparing a hyperdispersant: firstly modifying nano silicon dioxide, and then carrying out melt extrusion on the modified nano silicon dioxide and polyethylene glycol terephthalate through a single-screw extruder to obtain a resin sheet; s2, adding glass fibers and aramid fibers into the dispersion liquid, uniformly mixing, dehydrating, opening, blending cotton, carding, lapping and sewing to obtain a glass/aramid fiber felt; and S3, the resin sheets and the glass/aramid fiber felts are stacked in a crossed mode to the required layer number, after cutting and hot melting, a multi-layer core material is obtained, then sewing treatment is conducted, and finally the multi-layer glass fiber heat insulation plate is obtained through packaging and vacuumiz