Oxidized graphene surface molecular imprinting compound material used for tracking polycarboxylate-type water reducer and preparation method thereof

A graphene surface, polycarboxylic acid-based technology, applied in the field of graphene oxide surface molecularly imprinted composite materials and its preparation, can solve the problems of hindering the application of graphene oxide, low dispersibility of graphene oxide, etc. Durability, improved dispersibility, improved compressive strength and flexural strength

Inactive Publication Date: 2016-07-06
贵州科筑创品建筑技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of low dispersion of graphene oxide in cement-based composite materials in this method hinders the application of graphene oxide in cement-based materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Preparation of graphene oxide lamellar dispersion

[0025] Add 2 parts of graphite powder and 50 parts of concentrated sulfuric acid into the three-necked flask in sequence. Control the temperature of the system at 3°C, slowly add 2 parts of sodium nitrate and 8 parts of potassium permanganate within 1 hour, and continue the reaction for 2 hours. Raise the temperature to 35°C and react at medium temperature for 6 hours, slowly add 100 parts of deionized water dropwise for 30 minutes. Then raise the temperature to 85°C, after 40 minutes of high-temperature reaction, slowly add 150 parts of deionized water dropwise for 30 minutes, when the temperature of the system drops to 50°C, add 1.8 parts of hydrogen peroxide with a mass fraction of 30% to make the solution turn yellow, and use Wash with ionized water until the solution is neutral, and ultrasonically disperse the mixed solution for 40 minutes to obtain a graphene oxide sheet dispersion.

[0026] Step 2: Pre...

Embodiment 2

[0029] Step 1: Preparation of graphene oxide lamellar dispersion

[0030] Add 4 parts of graphite powder and 100 parts of concentrated sulfuric acid into the three-necked flask successively. Control the temperature of the system at 4°C, slowly add 4 parts of sodium nitrate and 16 parts of potassium permanganate within 1 hour, and continue the reaction for 3 hours. Raise the temperature to 35°C and react at medium temperature for 7 hours, slowly add 180 parts of deionized water dropwise for 50 minutes. Then raise the temperature to 85°C, after high temperature reaction for 40 minutes, slowly add 180 parts of deionized water dropwise for 50 minutes, when the system temperature drops to 60°C, add 4 parts of hydrogen peroxide with a mass fraction of 30% to make the solution turn yellow, use Wash with ionized water until the solution is neutral, and ultrasonically disperse the mixed solution for 80 minutes to obtain a graphene oxide sheet dispersion.

[0031] Step 2: Preparation ...

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Abstract

The invention discloses an oxidized graphene surface molecular imprinting compound material used for tracking a polycarboxylate-type water reducer. The compound material is prepared from, by mass, 100-120 parts of oxidized graphene lamella dispersing liquid, 10-30 parts of the polycarboxylate-type water reducer, 0.5-0.8 part of acrylamide, 2-4 parts of tetraethylortho silicate and 1.2-1.5 parts of dimethyl 2,2'-azobis(2-methylpropionate). The invention further discloses a preparation method of the oxidized graphene surface molecular imprinting compound material used for tracking the polycarboxylate-type water reducer. The problem that oxidized graphene is low in dispersity in a cement-based compound material is solved, the template function of the shape and surface active sites of a GO nano lamella on cement hydration reaction and products of the cement hydration reaction is enhanced, growth of flower-shaped GO hydrated crystals on pores and soft portions of the cement-based material is promoted, and the tendency that GO mutually penetrates in the cement-based material and is connected in different directions into a net-shaped structure is improved.

Description

technical field [0001] The invention belongs to the technical field of imprinted materials, and in particular relates to a graphene oxide surface molecular imprinted composite material for tracking polycarboxylate water reducers and a preparation method thereof. technical background [0002] Cement-based composite materials are currently the most widely used building materials. The biggest problem at present is that they are prone to cracks and leakage during use, resulting in short service life. The main reason is the high brittleness of cement-based composite materials and the It is caused by cracks and holes caused by the uncontrollable structure of hydration products. It is a current research hotspot to find a way to improve the mechanical properties of cement-based composites by changing the structure of cement hydration products. [0003] Graphene oxide is a derivative of graphene with multiple active groups on the surface, which has ultra-high toughness and large spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F120/56
CPCC04B40/0039C08F120/56C04B2103/302C04B24/2652C04B22/02
Inventor 吕生华贾春茂贺亚亚
Owner 贵州科筑创品建筑技术有限公司
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