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Hydrophobic cellulose nanosheet and preparation method thereof

A cellulose and hydrophobic technology, applied in the field of hydrophobic cellulose nanosheets and their preparation, achieves the effects of wide source of raw materials and simple operation of preparation method

Active Publication Date: 2019-07-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, many achievements have been made in the preparation of cellulose nanofibers and cellulose nanocrystals, but there are few reports on the preparation of cellulose nanosheets.

Method used

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  • Hydrophobic cellulose nanosheet and preparation method thereof
  • Hydrophobic cellulose nanosheet and preparation method thereof
  • Hydrophobic cellulose nanosheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of hydrophobic cellulose nanosheets, comprising the steps of:

[0029] 1) The wood pulp cellulose is crushed into a powder material, and vacuum-dried at 80° C. for 5 hours.

[0030] 2) Add 10ml of ferrous sulfate solution with a concentration of 0.25M into the zirconia ball mill jar.

[0031] 3) adding sulfuric acid to adjust the pH value to 6.

[0032] 4) Add 0.5 g of cellulose into a ball mill jar to obtain a prepreg, and crush the prepreg.

[0033] 5) Add 10ml of 0.25M hydrogen peroxide solution into the prepreg.

[0034] 6) Ball milling for 6 hours, the grinding balls are 7 zirconia balls with a diameter of 10 mm, and the grinding speed is 400 rpm.

[0035] 7) The product is centrifuged and washed with deionized water until neutral, and the centrifugation speed is 10000 rpm.

[0036] The obtained powder was mixed with ethanol to form a 0.04wt% suspension, ultrasonicated in a 100W water bath for 5min, and then 10ul of the dispersion was spin-...

Embodiment 2

[0038] A preparation method of hydrophobic cellulose nanosheets, the method is the same as in Example 1, except that:

[0039] Step 2) adding 10ml of ferrous sulfate solution with a concentration of 0.20M into the zirconia ball mill jar;

[0040] Step 3) adding sulfuric acid to adjust the pH value to 5.

Embodiment 3

[0042] A preparation method of hydrophobic cellulose nanosheets, the method is the same as in Example 1, except that:

[0043] Step 4) Add 0.6 g of linter cellulose into a ball mill jar to obtain a prepreg, and crush the prepreg.

[0044] Step 5) Add 10ml of 0.30M hydrogen peroxide solution into the prepreg.

[0045] The obtained powder was pressed into tablets, and the contact angle was tested by static drop method, and the amount of water added was 2 μl. figure 2 It is the contact angle diagram of the cellulose nanosheet obtained in Example 3. It can be seen from the diagram that the obtained product exhibits a certain degree of hydrophobicity, and the contact angle is 90°.

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Abstract

The invention discloses a hydrophobic cellulose nanosheet and a preparation method thereof. According to the preparation method disclosed by the invention, a cellulosic material is utilized as a raw material, and the cellulosic material is ground and prepared under the existence of ferrite and hydrogen peroxide. The hydrophobic cellulose nanosheet prepared by the method disclosed by the inventionhas the advantages of wide raw material sources, simpleness in preparation method operation, biocompatibility, biodegradability, certain hydrophobicity and the like. The hydrophobic cellulose nanosheet can serve as a more ideal functional filler to prepare a nanocomposite material and can be applied to the fields of food, papermaking, biological medicine, sensing, cosmetics and the like.

Description

technical field [0001] The invention relates to the technical field of natural polymer materials. More specifically, it relates to a hydrophobic cellulose nanosheet and a preparation method thereof. Background technique [0002] Cellulose has attracted much attention because of its environmental protection, wide range of sources, biodegradability and biocompatibility, etc., but its insoluble and infusible characteristics greatly limit its development and application. In order to further expand the application of cellulose, nano-sized cellulose can be prepared. Nanocellulose is one of the twenty most promising new materials in the future. It has the advantages of low density, high strength, good biocompatibility, and low thermal expansion coefficient. It can be used for material reinforcement, preparation of transparent paper, hydrogel, Various products such as airgel. [0003] The existing methods of cellulose nanotechnology mainly include acid hydrolysis, alkali treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/02
CPCC08B15/02
Inventor 吴敏鲁非雪王超黄勇
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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