The invention relates to a preparation method of tough SiO2
aerogel fibers post-processed through
isocyanate. The preparation method comprises steps as follows: a
spinning solution is prepared from
silicate or
silanol sol; an acid solution is used for a coagulating bath; the
spinning solution is added to the coagulating bath, the mixture has a reaction, wet
spinning is performed, orthosiliconic acid /
silicate fibers are obtained, wound, aged, washed, soaked in a
tetrahydrofuran solution of
isocyanate for 48 h, then taken out and washed with
acetone,
solvent replacement is performed through water or
ethanol, and the tough SiO2
aerogel fibers are obtained after
drying. The method has the characteristics that the raw materials are cheap and easy to obtain, the reaction process is simple, and the spinnability is good; the SiO2
aerogel fibers are toughened through high polymers, the prepared tough SiO2 aerogel fibers have rich pores, a high specific surface area and certain
toughness and is high-temperature-resistant and chemical-
corrosion resistant, and the specific surface area of the fibers is adjustable.