Preparing method for biomass-cellulose nanometer fiber

Abstract

The invention discloses a preparing method for a biomass-cellulose nanometer fiber. The preparing method includes the steps that a biomass fiber and a benzene-alcohol solution in the mass ratio of 1:(50-100) are weighed and put into a sodium chlorite solution, and the mixture and a KOH solution are mixed, sealed and mixed in a water bath kettle; the mixture is subjected to ultrasonic treatment and corona treatment; nanometer fiber suspension liquid is frozen, dried and subjected to supercritical drying or subjected to critical point drying. According to the preparing method, the biomass fiber is extracted through the benzene-alcohol solution, soluble substances in the biomass fiber are removed, then lignin is removed through sodium chlorite, hemicellulose is removed through the KOH solution, and the lignin and the hemicellulose are removed again; alkali-insoluble hemicellulose and alkali-insoluble lignin are treated and removed through hydrochloric acid, ultrasonic disruption treatment is finally carried out, then corona flow impacting is carried out, and the biomass-cellulose nanometer fiber with the high long diameter ratio and the high biomass cellulose is obtained. The nanometer fiber has better fiber distribution, the microstructure evenness performance is good, and the better mechanical performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of biomass, in particular to a method for preparing biomass cellulose nanofibers. Background technique [0002] The physical properties of nanomaterials are different from conventional materials. For example, the melting point of nano-gold is much lower than that of normal gold (1064°C), and the smaller the particle size, the lower the melting point: when the particle radius is 5nm, 3nm, and 2nm, the melting points are 900°C, 770°C, and 500°C, respectively. ℃. Nanomaterials also tend to have different colors than conventional materials. For example, gold is yellow, while gold nanoparticles are red. Nanotechnology can also alter the surface properties of materials. For example, through the glass treated with nano-TiO2 washed by water, the objects behind can be clearly seen, but the objects behind cannot be seen clearly due to the streaks of water on the surface of the untreated glass. [0003] Wood / ligno...

AI Technical Summary

Problems solved by technology

[0004] Due to the high hydrogen bond force between the cellulose molecular chains, the prepared nanofibers are easy to aggregate into fiber aggregates with a diameter higher than 100nm. These fibers are not easy to disperse evenly during use, which affects the reinforcement effect; using The preparation of bacterial cellulose by microbial fermentation can produce nanofibers with uniform diameter and size distribution and high aspect ratio of network entanglement, but the preparation cost of this material is relatively high, and the requirements for preparation conditions and preparation process are also relatively strict, which affects The production efficiency and economic benefits of nanofibers