Surface-modified silica/oxidized graphene nanocomposite and preparation method thereof

A nano-composite material and silicon dioxide technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve problems such as poor dispersion, limited graphene application, graphene easy to agglomerate, etc., to achieve organic The effect of good solubility, good product structure uniformity and regular material structure

Active Publication Date: 2016-03-16
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, untreated graphene is easy to agglomerate and has poor dispersion, which limits the application of graphene

Method used

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  • Surface-modified silica/oxidized graphene nanocomposite and preparation method thereof
  • Surface-modified silica/oxidized graphene nanocomposite and preparation method thereof
  • Surface-modified silica/oxidized graphene nanocomposite and preparation method thereof

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preparation example Construction

[0019] The preparation process of the silicon dioxide with amino groups used in the present invention can be found in Chinese patent ZL201210533104.X. The specific steps are: (1) TEOS and DMF are formulated into a mixed solution at a molar ratio of 1:6~1:12, (2) Measure 5~15ml of DMF and add ammonia water and KH550 to it, wherein the molar ratio of KH550 to TEOS obtained from the previous amount is 1:6~1:12, (3) Add the solution obtained in step (2) under the condition of mechanical stirring Add the solution obtained in step (1) dropwise to the solution, and continue stirring for 8-10 hours after the dropwise addition to prepare the organic silica sol with amino groups.

[0020] (1) Take 3.8ml (0.15mol) TEOS, dissolve it in 30ml (1.65mol) of DMF, and prepare a mixed solution; (2) Take 10ml of DMF in a three-necked flask, add 0.468ml (0.040mol) of KH550 and 0.48ml of ammonia water to make a mixed solution; (3) Mechanically stir the solution of (2), at the same time add the mixe...

Embodiment 1

[0023] First add 25ml of DMF to a 100ml single-necked flask, then add 1.2ml of silica sol with amino groups and sonicate for 20 minutes to obtain a dilute organic silica sol solution. Take a 100ml single-necked flask and add 40ml of DMF, and then add 20mg of graphene oxide for ultrasonic dispersion for 2 hours. Use a constant pressure dropping funnel to add the diluted organosilicon sol DMF solution at a rate of 1 to 3 drops per second to the continuously stirred dilute graphene oxide DMF solution at room temperature. , stirred and reacted for 1h, then ultrasonically dispersed for 30min, then continued to stir at room temperature for 10~12h, after the end of the reaction, ultrasonically for 1h, then filtered with a 220nm organic filter, washed with DMF, and then dispersed in 100ml DMF by ultrasonic, and then filtered by suction Repeat this process 3 times until the excess organosilica spheres are removed to obtain the organosilicon sol-reduced graphene oxide composite material,...

Embodiment 2

[0025] First add 15ml of DMF to a 100ml single-necked flask, then add 0.7ml of organic silica sol with amino groups and ultrasonically 20min to obtain a dilute solution of organic silica sol, take a 100ml single-necked flask, add 40ml of DMF, and then add 20mg of graphene oxide for ultrasonic dispersion for 2h. Add the sonicated organic silica sol dilute solution dropwise to the continuously stirred dilute graphene oxide solution at room temperature, stir for 1 hour, then ultrasonically disperse for 30 minutes, then continue to stir and react at room temperature for 10~12 hours, and then sonicate for 1 hour after the reaction. Afterwards, filter with a 220-nanometer organic membrane, wash with DMF, and then disperse in 100ml DMF with ultrasound, and repeat this process 3 times until the excess organosilica balls are removed, and the organosilica sol-reduced graphene oxide is obtained. Composite material, black powder solid can be obtained by drying.

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Abstract

The invention discloses a surface-modified silica/oxidized graphene nanocomposite and a preparation method thereof. The nanocomposite is prepared as follows: amide bonds are formed between silica nanometer particles with amino groups and a two-dimension oxidized graphene sheet by reaction between amino groups as well as carboxyl groups and epoxy functional groups which are at double sides of the two-dimension oxidized graphene sheet, in order to obtain the silica/oxidized graphene nanocomposite with covalent binding. The preparation method has the advantages of simple and easy technology and short reaction time; the nanocomposite has the advantages of regular structure, clear morphology, high yield, high purity, good stability and good organic dissolvability; the nanocomposite can be applied to high-molecular modification preparation of thermosetting resin, thermoplastic resin, rubber and other high-performance nanocomposites; the preparation method has the advantages of compact process, low cost, short reaction time and good identity of product structure, and the method can be applied to large scale industrial production.

Description

field of invention [0001] The invention relates to a graphene oxide nanocomposite material and a preparation method, in particular to a surface-modified silicon dioxide / graphene oxide nanocomposite material and a preparation method. Background technique [0002] With the continuous development of nanotechnology, nanomaterials have penetrated into all aspects of our lives and continue to play an important role. Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is a planar film composed of carbon atoms with sp2 hybrid orbitals forming a hexagonal honeycomb lattice, and a two-dimensional material with a thickness of only one carbon atom. Because of its large specific surface area and superior thermodynamics, optics, electrical and mechanical properties, it has been extensively studied by people since it came out, and has been widely used in solar cells, supercapacitors, sensors and Fuel cells and other fields. [0003] Traditional si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/02C08K3/04C08L101/00C09C1/46C09C3/06
Inventor 付继芳宗培松尚大鹏殷金涛陈立亚余文琪施利毅
Owner SHANGHAI UNIV
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