Preparation method of nanocellulose and polyethylene plate containing nanocellulose

The invention belongs to the field of preparation of nano-crystalline cellulose and polyethylene plates, and particularly relates to a preparation method of nano-crystalline cellulose and a polyethylene plate containing the nano-crystalline cellulose. The preparation method comprises the following steps: mixing commercial microcrystalline cellulose, mixed acid and lauryl sodium sulfate or sodium dodecyl benzene sulfonate or polyoxyethylene octanol for reaction; carrying out freeze drying, ultrasonic extraction and Soxhlet extraction to obtain nano cellulose, and fusing the nano cellulose into polyethylene to prepare a polyethylene plate; the preparation time of the nanocellulose is shortened, and the yield of the nanocellulose is improved; the components are uniformly distributed in a polyethylene matrix material, so that the mechanical property of a polyethylene matrix is enhanced; the polyethylene composite material is endowed with self-degradation capability at normal temperature, and has a wide applicatio