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Graphene/SiO2 composite material as well as preparation method and application thereof

A composite material and graphene technology, applied in the field of material chemistry, can solve the problems that graphene oxide is difficult to effectively peel off and disperse, the particle size and uniformity dimension are not easy to control, the reduction conditions and reduction degree are not easy to control, etc., to achieve a higher ratio Surface area utilization, low cost, effect of preventing agglomeration

Active Publication Date: 2014-01-22
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the graphite intercalation method and the layer-by-layer assembly method have high requirements for equipment, process control, and cost; the physical mixing method has simple operation and process, and the dispersion effect is not high, which is suitable for occasions that require low mixing uniformity; graphite oxide The reduction method after compounding ene first has the advantages of simple preparation method and low cost. However, due to the interaction between the oxygen-containing groups on the carbon sheet in the graphene oxide composite material and the composite components, in the subsequent reduction process The reduction conditions and reduction degree are not easy to control. When the selected reducing agent and reduction conditions have a destructive effect on the structure and performance of the composite components, the method is prone to failure
[0004] Chinese patent application number 201210072913.5 discloses a SiO 2 A method for grafting graphene oxide modified epoxy resin on nanoparticles, the method uses SiO 2 Nanoparticles grafted graphene oxide as a filler modified polymer, the method first prepares SiO 2 nanoparticles, post-preparation of SiO 2 The method of grafting graphene oxide to obtain composite materials, but the obtained SiO 2 The particle size, uniformity, and dimension are not easy to control, and graphene oxide is difficult to effectively peel off and disperse. In addition, graphene oxide is rich in oxygen functional groups, and its mechanical strength is not as good as graphene, so the modification effect on polymers needs to be improved

Method used

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  • Graphene/SiO2 composite material as well as preparation method and application thereof
  • Graphene/SiO2 composite material as well as preparation method and application thereof
  • Graphene/SiO2 composite material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of graphene dispersion: 5000 mL of graphene suspension of 0.01 mg / mL was prepared with polyethylene glycol, and subjected to ultrasonic oscillation (50 W) for 2 h to form a graphene dispersion.

[0035] (2) Add 180 g (0.86 mol) tetraethyl orthosilicate and 100 mL of water to the graphene dispersion obtained in step (1) to make a reaction mixture. The water in the reaction mixture is 5.56 mol, and diethylamine or Triethylamine adjusted the pH of the reaction mixture to 7.1-8.5 to make the mixture weakly alkaline, and then reacted with magnetic stirring at 10°C for 12 h.

[0036] (3) Sediment the product of step (2) with a centrifuge at a speed of 10,000 rpm, collect the solid product after standing, and repeat the operation 3 to 5 times. The collected product is then filtered and washed repeatedly with water or an organic solvent to remove various unreacted raw materials, impurities and by-products.

[0037] (4) Put the product in step (3) into an ordina...

Embodiment 2

[0040] (1) Preparation of graphene dispersion: 1000 mL of a 0.1 mg / mL suspension of graphene was prepared with water, and subjected to ultrasonic oscillation (100 W) for 2 h to form a graphene dispersion.

[0041] (2) Add 28.16 g (0.14 mol) tetraethyl orthosilicate to the graphene dispersion obtained in step (1) to make a reaction mixture, the water in the reaction mixture is 55.56 mol, adjust the pH value of the reaction mixture with ammonia water 8-10 to make the reaction mixture moderately alkaline, and then react with magnetic stirring at 10°C for 10 min.

[0042] (3) Sediment the product of step (2) with a centrifuge at a speed of 10,000 rpm, collect the solid product after standing, and repeat the operation 3 to 5 times. The collected product is then filtered and washed repeatedly with water or an organic solvent to remove various unreacted raw materials, impurities and by-products.

[0043] (4) Put the product in step (3) into an ordinary oven at 60°C for 3 h°C to remo...

Embodiment 3

[0046] (1) Preparation of graphene dispersion: Graphene was made into 1000 mL of 1 mg / mL suspension with ethanol / water mixed solvent, the volume ratio of ethanol / water was 1:8, and ultrasonically oscillated (300 W) for 1 h , forming a graphene dispersion.

[0047] (2) Add 14.3 g (0.13 mol) tetramethyl orthosilicate to the graphene ethanol / water dispersion obtained in step (1) to make a reaction mixture, the water in the reaction mixture is 49.38 mol, adjust the pH with sodium hydroxide The value is 10~12, making the mixture medium-strongly alkaline, and then reacting with magnetic stirring at 20°C for 2 h.

[0048] (3) Collect the product by vacuum distillation at a pressure of -0.1MPa and a temperature of 50~60°C.

[0049] (4) Put the product of step (3) in an ordinary oven at 80°C for 3 h to remove residual solvent and moisture, then place it in a vacuum drying oven, heat it up to 100°C under reduced pressure, and obtain graphene / SiO after further processing for 5 h 2 Comp...

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Abstract

The invention relates to the field of material chemistry and provides a graphene / SiO2 composite material for solving various problems existing in the existing preparation method of a graphene material. The composite material is composed of two components graphene and SiO2. The composite material disclosed by the invention is good in dispersity; and meanwhile, specific surface area utilization rate of the graphene is improved. Meanwhile, the invention further discloses a preparation method and an application of the graphene / SiO2 composite material. A preparation process in the invention is simple and applied to reinforcement filler of organic silicon polymer.

Description

technical field [0001] The invention relates to the field of material chemistry, in particular to a graphene / SiO 2 Composite materials and their preparation methods and applications. Background technique [0002] Graphene is the thinnest and hardest known material, with good light transmission, thermal conductivity, electrical conductivity and high specific surface area, and has huge potential in the fields of machinery, electronics, energy, materials, chemicals, medicine Application prospect. Graphene-based composite materials have become the most likely type of material for large-scale application of graphene due to the advantages of easy availability of raw materials and simple process. The graphene composite materials that have been successfully prepared so far include graphene / organic polymer composite materials, graphene / inorganic non-metallic composite materials, graphene / metal composite materials, etc., which have many excellent properties and can be widely used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/36C08K3/04C08K7/00C08L83/04
CPCY02P20/54
Inventor 王华兰邬继荣蒋剑雄巩凯杨成董一帆李志芳瞿志荣来国桥
Owner HANGZHOU NORMAL UNIVERSITY
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