High-strength cryogenic insulating material and preparation method thereof

The invention discloses a high-strength cryogenic insulating material and a preparation method thereof. The high-strength cryogenic insulating material is characterized by comprising non-alkali glass microfiber and glass fiber short shred, wherein the diameter of the non-alkali glass microfiber is 0.4-1 micron and the length of the non-alkali glass microfiber is 1-2 microns; the diameter of the glass fiber short shred is 3-5 microns and the length of the glass fiber short shred is 2-4 microns. The preparation method of the high-strength cryogenic insulating material comprises the steps of pulping, molding, drying, cutting and winding. According to the high-strength cryogenic insulating material, the glass fiber short shred is added in the non-alkali glass microfiber, so that the strength of the material can be effectively increased and the market demand is met.