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Method of using holocellulose to prepare nanopaper with high strength, haze and transparency

A cellulose-integrated, high-strength technology, applied in the field of biomass photoelectric nanomaterials, can solve the problems of difficulty in preparing nanocellulose paper with excellent mechanical properties and limit the application of nanocellulose paper, and achieve a simple and easy-to-operate preparation process with low cost. The effect of low cost and simple preparation process

Active Publication Date: 2019-07-30
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to prepare nanocellulose paper with excellent mechanical properties and overcome the counterbalance effect between haze and transparency, which limits the application of nanocellulose paper in the field of polymer composites and flexible optoelectronic devices.

Method used

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  • Method of using holocellulose to prepare nanopaper with high strength, haze and transparency
  • Method of using holocellulose to prepare nanopaper with high strength, haze and transparency
  • Method of using holocellulose to prepare nanopaper with high strength, haze and transparency

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preparation example Construction

[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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Abstract

The invention discloses a method of using holocellulose to prepare nanopaper with high strength, haze and transparency. The method particularly comprises the following steps of 1, preparing the holocellulose; 2, preparing wood pulp containing hemicellulose based on the holocellulose obtained in step 1; 3, preparing nanocellulose based on the wood pulp obtained in step 2; 4, preparing the nanocellulose paper based on the nanocellulose obtained in step 3. The nanocellulose paper prepared through the method provides an ideal material for flexible optoelectronic devices and polymer compound materials.

Description

technical field [0001] The invention belongs to the technical field of biomass optoelectronic nanomaterials, and relates to a method for preparing high-strength, high-haze and transparent nano-paper from cellulose. Background technique [0002] The main chemical components of plant fibers are cellulose, hemicellulose and lignin. Cellulose is one of the most abundant biomass materials in nature, and has the advantages of wide source, biodegradable, non-toxic, and environmental protection. Hemicellulose is an important part of the cell wall of higher plants, accounting for about one quarter to one third of plant biomass. In addition, hemicellulose has a large number of hydroxyl groups, which are distributed along the main chain and side chains. Hemicellulose is a promising renewable biomaterial due to its good bioactivity, biocompatibility, and low-oxygen barrier properties. Cellulose Nanofibrils (CNFs for short) is a green material with a diameter of 10-40nm and a length o...

Claims

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Application Information

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IPC IPC(8): D21H11/02D21C3/02D21C5/00D21H27/00D21J3/12
CPCD21C3/02D21C5/00D21H11/02D21H27/00D21J3/12
Inventor 李新平张鑫张召王楠马宁宁
Owner SHAANXI UNIV OF SCI & TECH
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