Method for preparing high-strength, high-haze and transparency nano-paper from cellulose
A holocellulose and high haze technology, applied in the field of biomass optoelectronic nanomaterials, can solve the problems of limiting the application of nanocellulose paper, difficult to prepare nanocellulose paper with excellent mechanical properties, etc. Low cost and the effect of expanding the application field
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[0022] (1) preparation of comprehensive cellulose
[0023] Using poplar wood alkaline hydrogen peroxide mechanical pulp as raw material, the sample was extracted with organic solvent (benzene:ethanol 2:1), and then the extract was evaporated and dried. The dried samples were taken and treated with sodium chlorite for 3 to 5 hours to remove lignin, and to obtain comprehensive cellulose (lignin content<1%).
[0024] (2) Treat the obtained hemicellulose with 2 to 10% NaOH (solid-to-liquid ratio of 1:10 to 30) for different times (0 to 3 hours) at a temperature of 40 to 50°C to obtain hemicellulose-containing wood pulp.
[0025] (3) preparation containing hemicellulose nanocellulose
[0026] The wood pulp containing the hemicellulose is sheared at a high speed for 3-10 minutes to prepare a suspension of 0.5-3 wt%, and homogeneously treated for 15-40 times under a pressure of 60-120 MPa to obtain the nano-cellulose containing the hemicellulose.
[0027] (4) Preparation of hemice...
Embodiment 1
[0031] Step 1, using poplar wood alkaline hydrogen peroxide mechanical pulp as raw material, using an organic solvent (benzene:ethanol 2:1) to extract the sample, and then evaporating and drying the extract. The dried samples were taken and treated with sodium chlorite for 4 hours to remove lignin to obtain cellulose (lignin content<1%).
[0032] In step 2, the hemicellulose in step 1 is taken without treatment to obtain wood pulp with a hemicellulose content of 17.88%.
[0033] In step 3, wood pulp with a hemicellulose content of 17.88% was prepared into a 1wt% suspension by high-speed shearing for 3 minutes, and homogenized under a pressure of 60 MPa for 40 times to obtain nanocellulose with a hemicellulose content of 17.88%.
[0034] Step 4, take 0.025g dry weight of nanocellulose with a hemicellulose content of 17.88%, add deionized water to disperse the solution evenly, and then pour it into a self-made sand core (placed with a water-based microporous membrane) for suctio...
Embodiment 2
[0036] Step 1, using poplar wood alkaline hydrogen peroxide mechanical pulp as raw material, using an organic solvent (benzene:ethanol 2:1) to extract the sample, and then evaporating and drying the extract. The dried samples were taken and treated with sodium chlorite for 4 hours to remove lignin to obtain cellulose (lignin content<1%).
[0037] Step 2: Treat the obtained hemcellulose with 10% NaOH (solid-to-liquid ratio: 1:30) for 1 hour at a temperature of 40° C. to obtain wood pulp with a hemicellulose content of 5.29%.
[0038] In step 3, the wood pulp with a hemicellulose content of 5.29% was prepared into a 0.5 wt% suspension by high-speed shearing for 6 minutes, and homogeneously treated 30 times under a pressure of 80 MPa to obtain nanocellulose with a hemicellulose content of 5.29%.
[0039]Step 4, take 0.025g dry weight of nanocellulose with a hemicellulose content of 5.29%, add deionized water to disperse the solution evenly, and then pour it into a self-made sand ...
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