Method for modifying graphene oxide

A technology of graphene and graphene dispersion liquid, which is applied in the field of building materials, can solve the problems of unverified water reducers, etc., and achieve the effect of uniform dispersion

Active Publication Date: 2015-09-02
SOUTHEAST UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The patent No. is CN103193426 "a preparation method of graphene oxide modified polymer cement waterproof coating" and the patent No. is CN104058676A "a kind of high toughness concrete and its preparation method", although GO and water reducer are stirred and then mixed with Cement mixing, but did not verify whether the water reducer modified GO so that it can be stably dispersed in the early age cement slurry

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  • Method for modifying graphene oxide
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Embodiment 1

[0028] A method for graphene oxide modification, comprising the steps of:

[0029] Step 1, the preparation of graphene oxide:

[0030] Add 1 g of graphite powder into a three-necked flask, add 23ml of 98% wt concentrated sulfuric acid, stir in an ice-water bath at 0°C for 15mins; add 1g of NaNO to the mixed solution 3 (purity ≥ 99.0%), slowly add 3g of potassium permanganate (purity ≥ 99.5%) after reacting for 20 mins, continue stirring for 40 mins; then raise the temperature to 35°C for 2 hrs, slowly add 70 ml of deionized water, and finally add 3 ml 30% hydrogen peroxide, after the solution is cooled and reacted completely, the product is centrifuged and washed to obtain graphene oxide;

[0031] Step 2, modification of graphene oxide:

[0032] Dissolve the graphene oxide sol with an ultrasonic cleaner for 1 h to obtain a light brown graphene oxide dispersion with a concentration of 2 mg / ml; take 30 ml of the solution and place it in a water bath at 80°C, and slowly drop it...

Embodiment 2

[0035] A method for graphene oxide modification, comprising the steps of:

[0036] Step 1 is the same as embodiment 1;

[0037] Step 2, modification of graphene oxide:

[0038] Dissolve the graphene oxide sol with an ultrasonic cleaner for 1 h to obtain a light brown graphene oxide dispersion with a concentration of 1 mg / ml; take 50 ml of the solution and place it in a water bath at 70°C, and slowly drop it under stirring. Add 2 g of polycarboxylate superplasticizer with a mass fraction of 20%, react for 30 mins, and then ultrasonicate for 1 h to obtain modified graphene oxide.

[0039] The modified graphene oxide obtained in Example 2 was dropped into a saturated calcium hydroxide solution, and slightly oscillated, but no coagulation phenomenon occurred, indicating that the modification was successful.

[0040] figure 1 Infrared spectrograms before and after modification of modified graphene oxide in Example 1 and infrared spectrograms of polycarboxylate superplasticizer (...

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Abstract

The invention discloses a method for modifying graphene oxide. According to the method, the surface of graphene oxide is modified, so that graphene oxide can be uniformly dispersed in cement paste. The method mainly comprises the following steps: putting a 0.2-5mg / ml graphene oxide dispersed liquid into a water bath pot of 60-80 DEG C, dropwise adding a polycarboxylate-type high-efficiency water reducing agent of which the mass is 6-8 times that of graphene oxide while the graphene oxide dispersed liquid is stirred, and after the reaction is completed, performing ultrasonic treatment for 0.5-1 hour, thereby obtaining modified graphene oxide. As the polycarboxylate-type high-efficiency water reducing agent is adopted to modify graphene oxide, PC is grafted on the surface of graphene oxide through covalence action, and the adsorption degree of a graphene oxide nanosheet layer to Ca<2+> is reduced, the problem that a graphene oxide adhesive can be coagulated in the presence of positive charge Ca<2+> can be solved, and furthermore the graphene oxide can be uniformly and stably dispersed in early-age cement paste.

Description

technical field [0001] The invention relates to a modification method of graphene oxide, which is mainly used in the preparation of high-strength, high-toughness and durability cement-based materials, and belongs to the field of building materials. Background technique [0002] At present, the development direction of concrete at home and abroad is low-carbon, green, and durable. Improving the strength and toughness of concrete materials is the key to realizing the durability of concrete, so as to achieve sustainable development of the construction industry. [0003] Graphene is the material with the strongest strength, the best toughness, and the largest specific surface area discovered by humans recently. Graphene oxide (GO) refers to the oxidation of graphite by concentrated sulfuric acid, potassium permanganate, etc., and the hydroxyl (-OH), carboxyl (-COOH), epoxy group (-O-), etc. are inserted into graphite sheets. In addition to improving the hydrophilicity of graphen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/00C04B24/24
Inventor 郭新立赵丽李琦张弘毅郭丽萍舒鑫刘加平
Owner SOUTHEAST UNIV
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