Preparation method of modified graphene powder capable of being redispersible in oil

A graphene powder and dispersion technology, applied in chemical instruments and methods, dyeing polymer organic compound treatment, inorganic chemistry, etc., can solve the problems of poor dispersion and stability of graphene, complex process, high energy consumption, etc., and achieve repeatable High performance, mature and stable process, high-efficiency dispersion effect

Active Publication Date: 2019-04-05
ZHONGBEI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at solving the existing problems of poor dispersibility and stability of graphene in non-polar organic solvents, complex process, high energy consumption and high cost, and provides a method for preparing modified graphene powder that can be oily dispersed

Method used

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  • Preparation method of modified graphene powder capable of being redispersible in oil
  • Preparation method of modified graphene powder capable of being redispersible in oil
  • Preparation method of modified graphene powder capable of being redispersible in oil

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Experimental program
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Effect test

Embodiment 1

[0028] The first step, the preparation of PVP-GO water dispersion solution:

[0029] Take the graphene oxide aqueous solution in a 250ml beaker, adjust the pH value to 8, then blend and ultrasonically disperse PVP (K=12~30) for 10 minutes and let it stand for a while (the mass ratio of GO:PVP is 2:3).

[0030] The second step, the preparation of polymer microspheres @ (PVP-rGO) powder:

[0031] Transfer the PVP-GO solution to a 250ml three-neck flask, weigh styrene (St) or methyl methacrylate (MMA), initiator (mass ratio K 2 S 2 o 8 :NaHSO 3 =1:1), feed into the three-neck flask at one time; pass N 2 Or protected by argon and placed in a 70°C water bath for 5 hours; then heated up to 90°C for condensing and reflux reduction with hydrazine hydrate for 2 hours, the solution gradually turned gray black, and the reduction product was filtered through filter paper (or high-speed centrifugation 8000~12000r / min ) to remove unloaded polymer microspheres, and then dry them in a va...

Embodiment 2

[0034] The adjustment of pH value 8 in the first step in Example 1 was changed to use 5% NaOH solution to wash the styrene monomer. All the other processes are as described in Example 1.

Embodiment 3

[0036] The mass ratio K described in the second step 2 S 2 o 8 :NaHSO 3 =1:1 is changed to 1:1~3, and all the other processes are as described in Example 1.

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Abstract

The invention discloses a preparation method of modified graphene powder capable of being redispersible in oil, and belongs to the technical field of graphene. The method can solve the problems of poor dispersibility and stability, complex process, large energy consumption and high cost of the existing graphene in non-polar organic solvents. The method includes, firstly, taking a GO aqueous solution as a raw material, adjusting the GO aqueous solution to be alkaline, and adding PVP to prepare a GO aqueous stable dispersion; secondly, adding polymer monomers (such as styrene, methyl methacrylate and the like) and an initiator at a certain temperature, polymerizing loaded polymer microspheres in situ on the PVP-modified GO surface, and after further thermal reduction, removing water by a spraying (cold and hot drying) method to prepare the modified graphene powder. The modified graphene powder can be dispersed in the non-polar organic solvents under the action of ultrasound. The preparation process is simple, the prepared modified powder oily dispersion has high concentration, excellent dispersibility and stability, and accelerates the engineering application pace of graphene in thefields of corrosion prevention and the like.

Description

technical field [0001] The invention belongs to the technical field of graphene, and specifically relates to a preparation method of a modified graphene powder that can be oily dispersed. The invention adopts a chemical method to regulate the surface structure of graphene to reduce the interaction force between graphene powders , while increasing the wettability and compatibility between graphene and organic solvents, improving the dispersion and stability of graphene in organic solvents. Background technique [0002] The application prospects and advantages of graphene anti-corrosion coatings are mainly in the application of marine heavy-duty anti-corrosion coatings. Whether it can be widely used depends on whether it can be produced in low-cost and stable batches, and secondly, whether it can replace imported heavy-duty anti-corrosion coatings in the marine environment. get applied. In order to realize the multiple functions of graphene in heavy-duty anti-corrosion coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09C3/10C01B32/194
CPCC09C1/00C09C3/10C01B32/194
Inventor 孙友谊陈贺齐春红刘亚青赵贵哲
Owner ZHONGBEI UNIV
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