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Silane modified graphene oxide modified polycarboxylic acid reducer and preparation method thereof

A technology of graphene chemistry and silane modification, which is applied in the field of polycarboxylate water reducer and its preparation, can solve the failure of the interaction between graphene oxide and polycarboxylate water reducer, and affect the uniform dispersion and effective effect of graphene oxide , hinder the uniform dispersion of graphene oxide, etc., to achieve super adsorption-dispersibility, improve the effect of enhancement and optimization, and the effect of low total porosity

Inactive Publication Date: 2019-06-28
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current problem is that graphene oxide is prone to agglomeration due to its small size and strong van der Waals force and hydrogen bonds, which hinders the uniform dispersion of graphene oxide in the cement matrix in sheets, resulting in defects in cement-based materials. And the formation of large aggregates reduces its specific surface area, affecting its role in cement-based materials
The graphene oxide-modified polycarboxylate water-reducer prepared by this method is physically modified, which may cause the interaction between graphene oxide and polycarboxylate water-reducer to fail under different solution environment conditions, thus affecting graphene oxide. Uniform dispersion and effective action in cement-based materials

Method used

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  • Silane modified graphene oxide modified polycarboxylic acid reducer and preparation method thereof
  • Silane modified graphene oxide modified polycarboxylic acid reducer and preparation method thereof
  • Silane modified graphene oxide modified polycarboxylic acid reducer and preparation method thereof

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Effect test

Embodiment 1

[0029] A silane-modified graphene oxide chemically modified polycarboxylate water reducer, made of the following components in parts by weight: 100 parts of isobutylene alcohol polyoxyethylene ether, γ-methacryloxypropyl trimethoxy 12 parts of silane, 5 parts of graphene oxide, 2 parts of ammonium persulfate, 1.0 part of hydrogen peroxide, 0.5 part of L-ascorbic acid, and 0.8 part of mercaptopropionic acid.

[0030] The concrete preparation method of above-mentioned water reducing agent is as follows:

[0031] Mix γ-methacryloxypropyl trimethoxysilane with 50% ethanol solution evenly, and stir magnetically for 1 hour in a water bath environment at 30-40°C, until γ-methacryloxypropyl trimethoxysilane The methoxysilane in the base silane is completely hydrolyzed into silanol groups; graphene oxide is added to the mixed solution, and ultrasonically dispersed for 1 hour until the graphene oxide is uniformly dispersed; the mixed solution is magnetically stirred and heated in a wate...

Embodiment 2

[0033] A sulfate-resistant competitive adsorption type silane-modified polycarboxylate water reducer, which is made of the following components in parts by weight: 100 parts of isobutylene alcohol polyoxyethylene ether, γ-methacryloxypropyl trimethoxy 15 parts of silane, 4 parts of graphene oxide, 0.5 part of ammonium persulfate, 1.2 parts of hydrogen peroxide, 1.0 part of L-ascorbic acid, and 0.8 part of mercaptopropionic acid.

[0034] The concrete preparation method of above-mentioned water reducing agent is as follows:

[0035] Mix γ-methacryloxypropyl trimethoxysilane with 50% ethanol solution evenly, and stir magnetically for 1 hour in a water bath environment at 30-40°C, until γ-methacryloxypropyl trimethoxysilane The methoxysilane in the base silane is completely hydrolyzed into silanol groups; graphene oxide is added to the mixed solution, and ultrasonically dispersed for 1 hour until the graphene oxide is uniformly dispersed; the mixed solution is magnetically stirre...

Embodiment 3

[0037] A sulfate-resistant competitive adsorption type silane-modified polycarboxylate water reducer, made of the following components in parts by weight: 100 parts of isobutylene alcohol polyoxyethylene ether, γ-methacryloxypropyl trimethyl 14 parts of oxysilane, 4.5 parts of graphene oxide, 1.0 part of ammonium persulfate, 1.1 parts of hydrogen peroxide, 0.9 parts of L-ascorbic acid, and 1.3 parts of mercaptopropionic acid.

[0038] The concrete preparation method of above-mentioned water reducing agent is as follows:

[0039]Mix γ-methacryloxypropyl trimethoxysilane with 50% ethanol solution evenly, and stir magnetically for 1 hour in a water bath environment at 30-40°C, until γ-methacryloxypropyl trimethoxysilane The methoxysilane in the base silane is completely hydrolyzed into silanol groups; graphene oxide is added to the mixed solution, and ultrasonically dispersed for 1 hour until the graphene oxide is uniformly dispersed; the mixed solution is magnetically stirred an...

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Abstract

The invention relates to a silane modified graphene oxide modified polycarboxylic acid reducer and a preparation method thereof. The reducer is prepared from the following steps: uniformly mixing gamma-methylacryloyl propyl triethoxy silane and a 50% ethanol solution till being fully hydrolyze to silanol groups; adding graphene oxide, and dispersing the graphene oxide ultrasonically to be dispersed uniformly and heating the same with a water bath; after the mixture is cooled to room temperature, carrying out suction filtration thereon through a vacuum pump and washing the ethanol solution; andcarrying out a free radial polymerization reaction of an aqueous solution on the prepared silane modified graphene oxide and isobutenol polyoxyethylene ether to obtain the silane modified graphene oxide modified polycarboxylic acid reducer. Compared with the prior art, the reducer has the advantages of being high in dispersing action to newly stirred cement-based materials, obvious in hardened cement-based material enhancing effect and the like, and is simple in preparation process, easily available in raw material, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer and a preparation method thereof, in particular to a silane-modified graphene oxide chemically modified polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Graphene oxide has the characteristics of large specific surface area, small pore size, and a variety of functional groups on the sheet. When mixed with cement-based materials, it can fill the gaps between cement particles, reduce porosity and fix free water. Moreover, the oxygen-containing functional groups on the graphene oxide sheet provide active sites for the growth of cement hydration crystals, which can regulate the structure of hydration products and aggregates, making their shape and aggregate structure tend to a regular and orderly microstructure, thereby controlling cement hydration. Defect structures such as cracks and holes in the matrix and cracking caused by penetration can effectively i...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F230/08C08F2/44C04B103/30
Inventor 何燕武阳王梦悦潘正华李佳豪
Owner SUZHOU UNIV OF SCI & TECH
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