▎ 摘　　要

NOVELTY - Preparing porous aerogel comprises e.g. (i) cooling sodium hydroxide containing mixed aqueous solution and urea to less than 5 degrees C, adding graphene oxide into the mixed solution, mechanically stirring, adding sodium carboxymethyl cellulose into another sodium hydroxide containing mixed aqueous solution and urea, and mechanically stirring to obtain sodium carboxymethyl cellulose solution, mixing the graphene oxide solution and the sodium carboxymethyl cellulose solution to obtain mixture, and (ii) pouring liquid paraffin into a reactor, mechanically stirring, dropping the mixture into the liquid paraffin, mechanically stirring after the addition is complete, adding epichlorohydrin into the liquid paraffin, performing reaction at room temperature, washing the target product in the lower layer repeatedly with distilled water and absolute ethanol to obtain hydrogel beads, and freeze-drying the hydrogel to obtain final product. USE - The porous aerogel is useful in preparing porous aerogel containing antibacterial and flame-retardant polypropylene fiber (claimed). ADVANTAGE - The porous aerogel containing antibacterial and flame-retardant polypropylene fiber: has excellent mechanical performance, simple preparation process and low cost. DETAILED DESCRIPTION - Preparing porous aerogel comprises (i) cooling sodium hydroxide containing mixed aqueous solution and urea to less than 5 degrees C, adding graphene oxide into the mixed solution, mechanically stirring the resulting graphene oxide solution, adding sodium carboxymethyl cellulose into another sodium hydroxide containing mixed aqueous solution and urea, and mechanically stirring to obtain sodium carboxymethyl cellulose solution, mixing the graphene oxide solution and the sodium carboxymethyl cellulose solution in a volume ratio of 1:1-3 to obtain mixture, and (ii) pouring liquid paraffin into a reactor, mechanically stirring, dropping the mixture into the liquid paraffin, mechanically stirring after the addition is complete, adding epichlorohydrin into the liquid paraffin, performing reaction at room temperature, neutralizing it with hydrochloric acid, removing the upper liquid paraffin, washing the target product in the lower layer repeatedly with distilled water and absolute ethanol to obtain hydrogel beads, and freeze-drying the hydrogel to obtain final product. INDEPENDENT CLAIMS are also included for: (1) porous aerogel prepared by above method; (2) preparing porous aerogel containing antibacterial and flame-retardant polypropylene fiber comprising (i) preparing mixture of antibacterial agent and flame retardant, (ii) preparing porous aerogels containing antibacterial agents and flame retardants, (iii) preparing porous aerogel polypropylene masterbatch containing antibacterial and flame retardant slow-release, and (iv) preparing porous aerogel containing antibacterial and flame-retardant polypropylene fiber; and (3) porous aerogel containing antibacterial and flame-retardant polypropylene fiber prepared by above method.