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Modified graphene oxide fewer-sheet aqueous-phase uniform dispersion solution for cement-based composite material, and preparation method and application thereof

A composite material and uniform dispersion technology, which is applied in the field of modified graphene oxide few-lamellar aqueous phase uniform dispersion and its preparation, and can solve problems such as limiting the application of graphene oxide.

Active Publication Date: 2018-12-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But none of these can solve and realize the uniform dispersion of graphene oxide nanosheets in the materials used, thus limiting the application of graphene oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 100 parts of graphene oxide nanosheet dispersion with a mass fraction of 0.2% into the reactor and heat to 50°C, add 5 parts of intercalation monomer N-vinylpyrrolidone under stirring, and stir for 1 hour to form an intercalation composite Then add 10 parts of comonomer acrylic acid, 0.5 parts of initiator hydrogen peroxide and 1 part of alkaline substance ethanolamine, and continue to react at 50°C for 2 hours under stirring. Graft copolymerization reaction of layer monomer and comonomer, cooling to 25°C and ultrasonic dispersion for 1 hour, to obtain a homogeneous dispersion of modified graphene oxide with few lamellar layers in water. The average thickness of graphene oxide nanosheets is 0.4 nm, and the average plane size is 122.6 nm. It is mixed with mixing water and then mixed into cement-based composite materials. When the mass fraction of graphene oxide added is the mass fraction of cement When compared with the blank control sample, the compressive strength ...

Embodiment 2

[0033] Add 200 parts of graphene oxide nanosheet dispersion with a mass fraction of 0.2% into the reactor and heat to 60°C, add 8 parts of intercalation monomer 3-methyl-1-vinylimidazole under stirring, and stir for 2 hours , to form an intercalation complex, then add 15 parts of comonomer acrylic acid, 0.2 parts of initiator cerium ammonium nitrate and 2 parts of basic substance diethanolamine, and continue to react at 60 °C for 3 hours under stirring, the intercalation monomer and comonomer The copolymerization reaction of the intercalation monomer and the comonomer is realized, and the temperature is lowered to 25 ° C and ultrasonically dispersed for 2 hours to obtain a uniform dispersion of the modified graphene oxide few-lamellar aqueous phase. The average thickness of graphene oxide nanosheets is 0.8 nm, and the average plane size is 185.7 nm. It is mixed with mixing water and then mixed to prepare cement-based composite materials. When the mass fraction of graphene oxide...

Embodiment 3

[0035] Add 150 parts of graphene oxide nanosheet dispersion with a mass fraction of 0.2% into the reactor and heat to 60°C, add 6 parts of intercalation monomer 3-methyl-1-vinylpyrazole under stirring, and stir for 1.5 Hours, to form an intercalation complex, then add 12 parts of comonomer hydroxyethylacrylic acid, 0.3 parts of initiator ammonium persulfate and 1.5 parts of basic substance triethanolamine, and continue to react at 55 ° C for 2 hours under stirring, and the intercalation single The copolymerization reaction between the intercalation monomer and the comonomer is realized, and the graft copolymerization reaction between the intercalation monomer and the comonomer is realized, and the temperature is lowered to 25°C and ultrasonically dispersed for 1.5 hours to obtain a homogeneous dispersion of the modified graphene oxide few-lamellar aqueous phase . The average thickness of graphene oxide nanosheets is 0.6 nm, and the average plane size is 162.5 nm. It is mixed w...

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Abstract

The invention discloses a modified graphene oxide fewer-sheet aqueous-phase uniform dispersion solution for a cement-based composite material, and a preparation method and an application thereof. Themodified graphene oxide less-sheet aqueous-phase uniform dispersion solution consists of the following materials in parts by mass: 100-200 parts of a graphene oxide sheet dispersion solution with themass percentage of 0.2%, 5-8 parts of an intercalated polymerization monomer, 10-15 parts of a comonomer, 0.2-0.5 part of an initiator and 1-2 parts of an alkaline substance. The invention also discloses the preparation method of the modified graphene oxide fewer-sheet aqueous-phase uniform dispersion solution. The preparation method has the innovation that a fewer-sheet (1-3 monolayer aggregates)graphene oxide nano-sheet uniform dispersion solution is prepared by intercalation, template effect and graft polymerization, and is mixed with blending water and is mixed into the cement-based composite material; the product is used for preparing the large-scale compact, regular and micro-structure cement-based composite material for large-volume engineering; the compressive strength and flexural strength of the cement-based composite material are increased by 56%-125% and 72%-137% respectively. Meanwhile, the structure of the cement-based composite material is compact and has strong osmosis-resistant and crack-resistant abilities.

Description

technical field [0001] The invention belongs to the field of graphene oxide functional materials and building materials, and in particular relates to a modified graphene oxide few-lamellar water-phase uniform dispersion liquid for cement-based composite materials and a preparation method thereof. technical background [0002] Graphene oxide, as a derivative of graphene, not only has the main structure and performance characteristics of graphene, such as large specific surface area, ultra-high strength and thermal conductivity, but also has its own unique structure and properties, such as in graphene oxide. The nanosheets contain a large number of functional groups such as carboxyl, hydroxyl, and epoxy groups, making graphene oxide hydrophilic and easy to form nanosheet-like dispersions in the aqueous phase. At the same time, due to the intermolecular force between the graphene oxide nanosheets, the graphene oxide nanosheets exist in the state of aggregates and aggregates of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F226/10C08F226/06C08F220/04C08F2/44C04B14/02C04B20/02
CPCC04B14/024C04B20/023C08F2/44C08F220/04C08F220/06C08F226/10C08F226/06
Inventor 吕生华孙立雷颖胡浩岩张佳
Owner SHAANXI UNIV OF SCI & TECH
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