Cellulose-based composite material with three-dimensional porous structure and preparation method of cellulose-based composite material

A cellulose-based, three-dimensional porous technology, applied in the field of chemical materials, can solve problems such as the controllability of structure and performance, the limitations of large-scale application of ultrasonic dispersion methods, harsh conditions, etc., and achieve high surface reactivity, structural performance, etc. Adjustable, widely used effects

Inactive Publication Date: 2015-02-18
BOZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ultrasonic dispersion method commonly used in these methods limits the large-scale application. At the same time, there are disadvantages such as many steps, low output, and relatively harsh conditions, and it does not involve the controllability of structure and performance.

Method used

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  • Cellulose-based composite material with three-dimensional porous structure and preparation method of cellulose-based composite material
  • Cellulose-based composite material with three-dimensional porous structure and preparation method of cellulose-based composite material
  • Cellulose-based composite material with three-dimensional porous structure and preparation method of cellulose-based composite material

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preparation example Construction

[0033] The present invention also provides a method for preparing the above-mentioned cellulose-based composite material with a three-dimensional porous structure, comprising the following steps:

[0034] (1) Mix the cellulose solution with a mass fraction of 2 to 10% and the graphene oxide concentrated dispersion liquid with a mass fraction of 0.5 to 10%, and carry out shear dispersion, and the time of the shear dispersion is 2 to 8h to obtain Composite system of graphene oxide and cellulose;

[0035] (2) adding a flocculant to the composite system of graphene oxide and cellulose to obtain flocs;

[0036] (3) the floc obtained in step (2) is soaked and washed with deionized water more than twice to obtain graphene oxide / cellulose hydrogel;

[0037] (4) Put the graphene oxide / cellulose hydrogel in liquid nitrogen to freeze for 0.5-6h, and then freeze-dry at -45~-55°C for 45-50h to obtain a cellulose-based composite material with a three-dimensional porous structure .

[003...

Embodiment 1

[0049] Step (1), after the natural graphite is oxidized by the Hummers method or the improved Hummers method, it is repeatedly washed with deionized water and centrifuged, and the concentrated dispersion of graphene oxide in the lower layer is taken, and its mass percentage concentration is calibrated to be 4.2wt%, and placed in a refrigerator Store in the refrigerator for later use.

[0050] Step (2), the cellulose solution preparation standard that is 4.0wt% by mass percent content, cellulose is added into cellulose alkali urine solvent (solvent component has sodium hydroxide, urea and deionized water, described sodium hydroxide, The mass ratio of urea and deionized water is 5.8:10:84.2) to swell and evenly disperse, and then put it in the refrigerator to freeze for 24 hours, then take it out to thaw and shake vigorously to room temperature to form a clear and transparent cellulose solution.

[0051] Step (3), add 13.125g (i.e. 525mg cellulose) of thawed cellulose solution w...

Embodiment 2

[0053] According to the preparation method of embodiment 1, the difference is that the amount of graphite oxide concentrated dispersion is 0.625g, and the ball milling time is all unified as 6h, adopts the plastic mold frame molding of 10mm * 30mm * 0.2mm, obtains containing 5% graphene oxide ( A cellulose-based three-dimensional porous sheet based on the mass percentage of graphene oxide and cellulose.

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Abstract

The invention relates to a cellulose-based composite material with a three-dimensional porous structure. The cellulose-based composite material comprises the following components in percentage by mass: 0.01-99.99% of graphene oxide and 0.01-99.99% of cellulose, wherein an oxygen-containing group in the graphene oxide and hydroxyl in cellulose form a hydrogen bond, and the cellulose is natural or regenerated cellulose with molecular weight smaller than or equal to 4*10<5>. The invention further relates to a preparation method of the cellulose-based composite material with the three-dimensional porous structure. The cellulose-based composite material with the three-dimensional porous structure disclosed by the invention has the advantages of graphene oxide and cellulose, is adjustable in structural performance and wide in application. The preparation method of the cellulose-based composite material has the advantages of cheap and rich raw materials, a simple process and easy industrialization.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a cellulose-based composite material with a three-dimensional porous structure and a preparation method thereof. Background technique [0002] Three-dimensional porous materials have broad application prospects in the fields of adsorption, energy storage, electrodes, or loaded catalytic materials. Among them, increasing the specific surface area of ​​porous materials and regulating the preparation of three-dimensional pore structures are current research hotspots in this field, and the cost is low. The process is simple and environmentally friendly, and large-scale preparation is the pursuit direction of sustainable industrialization. [0003] Graphene is a sp 2 -C monoatomic layer is regularly arranged into a planar film of hexagonal honeycomb lattice, a two-dimensional nanomaterial with only a single carbon atom thickness. Graphene has many unique properties (high modulus, g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/18C08J3/075C08L1/02C08K9/00C08K3/04
Inventor 欧阳文竹聂鹏
Owner BOZHOU TEACHERS COLLEGE
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