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Preparation method of graphene bonding modified silica fume

A graphene and modified silicon technology, applied in the field of cement concrete admixtures, can solve the problems of unstable concrete performance, complicated preparation process of modified graphene, low degree of dispersion, etc., achieve excellent dispersion retention, improve electrical properties, Apply a wide range of effects

Active Publication Date: 2015-07-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this modified graphene is complicated, and the degree of dispersion is not high, which makes the performance of concrete unstable.

Method used

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  • Preparation method of graphene bonding modified silica fume
  • Preparation method of graphene bonding modified silica fume
  • Preparation method of graphene bonding modified silica fume

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0030] (1) Take 10ml of silane coupling agent KH550, 36ml of ethanol, and 4ml of water in a test tube to prepare a solution of silane coupling agent KH550 (20% of silane coupling agent KH550, 72% of ethanol, and 8% of water). Take 15ml of the solution and place it in a test tube, which is designated as test tube 1;

[0031] (2) Get 10mg carboxylated graphene and dicyclohexylcarbodiimide DCC respectively, add in the test tube 1 successively, and adjust its pH to be 6~8, ultrasonic dispersion 1h, obtain brown homogeneous mixed solution in the test tube 1, Then stir the homogeneous mixture, and heat it to 70° C., and keep the homogeneous mixture at this temperature for 24 hours to obtain a black uniform coupling-modified graphene mixture;

[0032] (3) Place the above-mentioned coupling-modified graphene mixed solution in a separator for separation for 1 hour. After separating the coupling-modified graphene sheet, rinse it repeatedly with pure alcohol until it is clean, then put i...

Embodiment 3

[0037] (1) Take 9ml of silane coupling agent KH550, 36ml of ethanol, and 5ml of water in a test tube to prepare a solution of silane coupling agent KH550 (18% of silane coupling agent KH550, 72% of ethanol, and 10% of water). Take 15ml of the solution and place it in a test tube, which is designated as test tube 3;

[0038] (2) Take 12mg of carboxylated graphene and 3mg of boride catalyst boric acid respectively, add them to test tube 3 in turn, and adjust its pH to 6-8, ultrasonically disperse for 1.5h, and obtain a brown uniform mixed solution in test tube 3, then stir The homogeneous mixed solution is heated to 75° C., and the homogeneous mixed solution is kept at this temperature for 28 hours to obtain a black uniform coupling-modified graphene mixed solution;

[0039] (3) Place the above-mentioned coupling-modified graphene mixed solution in a separator for separation for 1 hour. After separating the coupling-modified graphene sheet, rinse it repeatedly with pure alcohol ...

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Abstract

The invention relates to a preparation method of graphene bonding modified silica fume. The method comprises steps as follows: 1) carboxylated graphene and a silane coupling agent KH550 solution have a reaction under the action of a catalyst, so that coupling modified graphene is obtained; 2) then the coupling modified graphene reacts with the silane coupling agent KH550 solution, and KH550 sol containing the coupling modified graphene is obtained; 3) the KH550 sol reacts with surface hydroxylation modified silica fume, and the graphene bonding modified silica fume can be prepared. The method has the benefits as follows: (1) the strength of cement based composite materials can be significantly enhanced, so that the silica fume has the higher dispersity as well as excellent electrical properties; (2) concrete can have the higher flowing property; (3) the strength (especially the bending strength) of cement concrete can be enhanced, and the toughness of the cement concrete is improved; (4) the application range of the concrete is wider.

Description

technical field [0001] The invention relates to a preparation method of graphene-bonded modified silica fume, which belongs to the field of cement concrete admixtures. Background technique [0002] With the development of modern science and technology and production, especially the concept of "high-performance concrete", the use of concrete pays more attention to the durability, workability and adaptability of concrete in harsh environments. Due to its submicron spherical size, silica fume can fill capillary pores in high-performance concrete and improve the compactness of concrete; at the same time, silica fume has a ball effect in cement paste, which improves the interaction between water, aggregate and cement particles. liquidity etc. In 2012, the thirteenth member congress of China Building Materials Federation Concrete Admixture Branch disclosed the characteristics of silica fume and its special effects in cement-based materials. Silica fume can reduce viscosity, incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/00
Inventor 黄健王新马保国王允栋稂合清李相国蹇守卫谭洪波
Owner WUHAN UNIV OF TECH
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