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Preparation method of 3D reticular high-crystallinity walnut shell-based nanocellulose

A technology of nanocellulose and high crystallinity, which is applied in pulping of cellulose raw materials, post-treatment of cellulose pulp, post-treatment and modification of cellulose pulp, etc., can solve the problem of low utilization rate of walnut shells, low economic added value, Pollution of the environment and other problems, to achieve the effect of adding added value, superior performance and low energy consumption

Pending Publication Date: 2021-12-24
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the wide range of species value and processing utilization of walnuts, a large number of by-products—walnut shells are also produced. However, the utilization rate of walnut shells is low at present, and most of them are only used as feed or discarded at will, and the economic added value is not high. polluted environment

Method used

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  • Preparation method of 3D reticular high-crystallinity walnut shell-based nanocellulose
  • Preparation method of 3D reticular high-crystallinity walnut shell-based nanocellulose
  • Preparation method of 3D reticular high-crystallinity walnut shell-based nanocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Walnut shells are washed, dried, crushed, and passed through a 200-mesh sieve to obtain walnut shell powder.

[0030] 2. Take 5g of walnut shell powder and wrap it with filter paper, put it into 150mL of a mixture of toluene and absolute ethanol with a volume ratio of 2:1, extract at 145°C for 12 hours to remove pigments and lipids, and take out the wrapped walnut shell The filter paper bag of powder is dried at room temperature for 12 hours to obtain defatted walnut shell powder.

[0031] 3. Add 5g of defatted walnut shell powder to 200g of deionized water, add 2.8g of sodium chlorite and 2g of glacial acetic acid, heat and stir in a water bath at 75°C for 1 hour, then add 2.8g of sodium chlorite and 2g of ice Acetic acid, continue to react for 1 hour, repeat like this 5 times, and react for 6 hours in total. After the reaction is completed, filter and wash with deionized water to neutrality, and dry at 80°C to obtain hemcellulose.

[0032] 4. Mix 5 g of cellulose...

Embodiment 2

[0036] In step 5 of the present embodiment, 200 g of the diluent was taken, and 0.032 g of 2,2,6,6-tetramethylpiperidine oxide, 0.2 g of sodium bromide, and 3.56 g of sodium hypochlorite were added, and the other steps were the same as in Example 1. Three-dimensional network nanocellulose was obtained. Depend on Figure 4 It can be calculated that the crystallinity of the nanocellulose prepared in this example is 83.32%, which is higher than the crystallinity of commercial nanocellulose, and the Zeta potential of the nanocellulose dispersion is -48.00mV, indicating that the surface has a large amount of negative charges. The nanocellulose is relatively stable.

Embodiment 3

[0038] In the step 5 of this embodiment, get 200g diluent, add 0.032g 2,2,6,6-tetramethylpiperidine oxide, 0.2g sodium bromide, 10.65g sodium hypochlorite, other steps are the same as in Example 1, A three-dimensional network nanocellulose was obtained. Depend on Figure 5 It can be seen that the cellulose fibers are interconnected and interlaced, with a network structure, and the fiber diameter is below 50nm, reaching the nanometer level. Figure 4 It can be calculated that the crystallinity of the nanocellulose prepared in this example is 84.84%, which is higher than the crystallinity of commercial nanocellulose, and the Zeta potential of the nanocellulose dispersion is -30.47mV, indicating that the surface has a large amount of negative charges, and the prepared The nanocellulose is relatively stable.

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Abstract

The invention discloses a preparation method of 3D reticular high-crystallinity walnut shell-based nanocellulose. The method comprises the following steps: by taking walnut shells as raw materials, crushing the walnut shells, degreasing, performing chemical treatment by adopting sodium chlorite and glacial acetic acid to obtain holocellulose, purifying the holocellulose by using potassium hydroxide to obtain cellulose, and finally oxidizing through a physical field and 2, 2, 6, 6-tetramethylpiperidine oxide to obtain the nanocellulose with a three-dimensional network structure, wherein the length-diameter ratio of the nanocellulose is high, and the crystallinity can reach 80%. According to the invention, the method is simple in process and easy to implement, the raw material walnut shells are renewable, degradable and low in cost, the green and sustainable development principle is met, the source of the nanocellulose raw material is enriched, waste recycling and sustainable development are achieved, environmental pollution is reduced, and the utilization rate of the walnut shells is increased.

Description

technical field [0001] The invention belongs to the technical field of nanocellulose preparation, in particular to a method for preparing 3D reticular high crystallinity walnut shell-based nanocellulose. Background technique [0002] With the surge in population, the demand for oil crops and edible oil in the world has increased sharply. As a woody oil plant, walnut has formed four major cultivation regions: Southwest, Northwest, Eastern Coast and Central China, with the planting area and output ranking first in the world. The oil content of walnut kernel is about 70%, which is 3.5 times that of soybean. It is a high-grade edible oil and industrial oil. Therefore, walnut is known as the "king of woody oils". [0003] With the wide range of species value and processing utilization of walnuts, a large number of by-products—walnut shells are also produced. However, the utilization rate of walnut shells is low at present, and most of them are only used as feed or discarded at w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/18D21C3/00D21C3/20D21C3/04D21C3/02D21C9/00
CPCD21H11/18D21C3/003D21C3/20D21C3/04D21C3/02D21C9/005D21C9/004
Inventor 申烨华李丹妮白秋红张路伟李聪陈邦王妍
Owner NORTHWEST UNIV(CN)
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