Flame-retardant heat-insulating material for battery cell and preparation method of flame-retardant heat-insulating material

Abstract

The invention relates to the technical field of thermal insulation materials, and discloses a flame-retardant thermal insulation material for a battery cell and a preparation method of the flame-retardant thermal insulation material. According to the invention, cellulose is subjected to dissolution, crosslinking and flame-retardant modification, and gel forming and drying, such that the flame-retardant thermal insulation material for the battery cell is obtained. An active intermediate released by an oxazine ring during ring-opening polymerization at a high temperature can catalyze a cross-linking reaction between molecular chains to form a three-dimensional network structure, so that the flame retardant property of the material is improved; boric acid ester is decomposed at a high temperature to generate boric oxide or boric acid, a transparent glassy coating is formed after melting, the surface of the material is tightly covered, oxygen and heat transfer are physically blocked, and the flame-retardant effect is achieved; phosphorus-containing free radicals generated by decomposition of phosphate can be combined with active free radicals in flames, so that a combustion chain reaction is interrupted, the flame temperature is reduced, and the flame retardant property of the material is further improved. And non-combustible or flame-retardant substances such as silicon dioxide generated by decomposition of silane can form a compact protective layer on the surface of the material, so that flame propagation is prevented, and a flame-retardant effect is achieved.