Preparation method of ultralight and hydrophobic nano fibrillated cellulose aerogel with high oil absorption

The invention discloses a preparation method of an ultralight and hydrophobic nano fibrillated cellulose aerogel with high oil absorption, and relates to a preparation method of cellulose aerogel. The method disclosed by the invention aims to solve the problem that existing cellulose aerogel which is lower in oil absorption multiplying power and strong in hydrophilicity is not suitable for oil-water separating materials. The method comprises the following steps: I, preparing cellulose aqueous liquor; II, preparing a nano fibrillated cellulose aqueous dispersion liquid; III, preparing a strongly gelatinous nano fibrillated cellulose aqueous dispersion liquid; IV, freezing and drying; and V, carrying out hydrophobic modification to obtain the ultralight and hydrophobic nano fibrillated cellulose aerogel with high oil absorption. The preparation method of the ultralight and hydrophobic nano fibrillated cellulose aerogel with high oil absorption is simple in preparation process, wide in source of raw materials, low in cost and environment-friendly and green. The invention relates to the preparation method of the ultralight and hydrophobic nano fibrillated cellulose aerogel with high oil absorption.