A kind of viscosity-reducing composite polycarboxylate water reducer and preparation method thereof

A composite polycarboxylate and water reducer technology, applied in the field of concrete admixtures, can solve the problems of performance degradation, large concrete slump, high viscosity, etc.

Active Publication Date: 2019-10-18
南通瑞特建筑材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The excessive decrease of concrete slump over time has always been a problem that plagues normal construction
The amount of polycarboxylate superplasticizer itself is very low, and a large amount of superplasticizer will be consumed in the early stage of concrete mixing, resulting in the lack of actual effective ingredients in the later concrete, resulting in a decline in its application performance, especially the serious loss of slump in the later stage , cannot meet the requirements of normal construction
[0005] In addition, polycarboxylic acid has a structure with polyether as the main chain and polyether as the side chain. The molecular thermal stability of this structure is poor, and the molecular structure is easily destroyed under the condition of high temperature for a long time, so that the performance is greatly reduced.
[0006] Therefore, in view of the above problems, the present invention provides a viscosity-reducing composite polycarboxylate water-reducer, which solves the problems of high viscosity and slow flow rate in concrete, and also has low dosage, high water-reducing rate, strong plasticity, and slump. Small sag loss, low shrinkage, good thermal stability, green and environmentally friendly, etc.

Method used

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  • A kind of viscosity-reducing composite polycarboxylate water reducer and preparation method thereof

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preparation example Construction

[0038] The preparation method of the β-cyclodextrin derivative comprises the following steps:

[0039] (1) Add concentrated sulfuric acid and sodium nitrate to the reactor, cool in an ice-water bath, stir and add carbon nanotubes at 0-5°C, mix well and slowly add potassium permanganate, and control the reaction temperature at 10-15°C , react for 2h, continue to stir and react for 2h at 35°C, add deionized water, control the temperature of the reaction solution at 98°C, continue to stir for 0.5h, then add hydrogen peroxide with a mass concentration of 30%, filter while it is hot, and dilute hydrochloric acid (1mol / L) washing the product to neutrality, and drying under reduced pressure at 60° C. for 24 hours to obtain acidified carbon nanotubes; the weight ratio of the acidified carbon nanotubes to the sodium nitrate and the potassium permanganate is 1 : 0.6:4; the mass volume ratio of the carbon nanotubes to the concentrated sulfuric acid with a mass concentration of 98%, the ...

Embodiment 1

[0069] The viscosity-reducing composite polycarboxylate water-reducer includes polycarboxylate water-reducer A, polycarboxylate water-reducer B, polycarboxylate water-reducer C, β-cyclodextrin derivatives, methyl double other cyclodextrin, deionized water; wherein, the β-cyclodextrin derivative is sodium dodecylsulfonate and carbon nanotube modified β-cyclodextrin; the polycarboxylate water reducer A and The weight ratio of the polycarboxylate water reducer B to the polycarboxylate water reducer C is 1:0.7:1.1; the weight of the β-cyclodextrin derivative and the methyl beta cyclodextrin The ratio is 1:1.3; the weight ratio of the polycarboxylate superplasticizer A to the methyl beta cyclodextrin is 1:0.016;

[0070] The preparation method of the described viscosity-reducing composite polycarboxylate water reducer comprises the following steps:

[0071] (1) Add polycarboxylate superplasticizer A, polycarboxylate superplasticizer B, polycarboxylate superplasticizer C, β-cyclode...

Embodiment 2

[0090]The viscosity-reducing composite polycarboxylate water-reducer includes polycarboxylate water-reducer A, polycarboxylate water-reducer B, polycarboxylate water-reducer C, β-cyclodextrin derivatives, methyl double other cyclodextrin, deionized water; wherein, the β-cyclodextrin derivative is sodium dodecylsulfonate and carbon nanotube modified β-cyclodextrin; the polycarboxylate water reducer A and The weight ratio of the polycarboxylate water reducer B to the polycarboxylate water reducer C is 1:0.5:0.8; the weight of the β-cyclodextrin derivative and the methyl beta cyclodextrin The ratio is 1:1.3; the weight ratio of the polycarboxylate water reducer A to the methyl beta cyclodextrin is 1:0.016; the preparation method of the viscosity-reducing composite polycarboxylate water reducer, the The preparation method of the polycarboxylate water reducer A, the preparation method of the polycarboxylate water reducer B, the preparation method of the polycarboxylate water reduce...

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Abstract

The invention provides a viscosity reduction type composite polycarboxylic acid water reducing agent. The viscosity reduction type composite polycarboxylic acid water reducing agent is prepared from a polycarboxylic acid water reducing agent A, a polycarboxylic acid water reducing agent B, a polycarboxylic acid water reducing agent C, a beta-cyclodextrin derivative, methyl-beta-cyclodextrin and de-ionized water, wherein the polycarboxylic acid water reducing agent A is prepared from the following preparation raw materials: isopentenyl polyoxyethylene ether, acrylic acid, an initiator 1, a chain transferring agent 1 and de-ionized water; the polycarboxylic acid water reducing agent B is prepared from the following preparation raw materials: methylallyl polyethylene glycol ether, acrylic acid, sodium methallyl sulfonate, an initiator 2, a chain transferring agent 2 and de-ionized water; the polycarboxylic acid water reducing agent C is prepared from the following preparation raw materials: diallyl capped polyether, acrylic acid, methylallyl polyethylene glycol ether, an initiator 3, a chain transferring agent 3 and de-ionized water; the diallyl capped polyether is prepared by carrying out allylation capping on the methoxy polyethylene glycol through allyl bromide; the beta-cyclodextrin derivative is beta-cyclodextrin modified by sodium dodecyl sulfonate and carbon nanotubes.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a viscosity-reducing composite polycarboxylate water reducer and a preparation method thereof. Background technique [0002] At present, concrete is still the main and largest building material in the construction industry. In recent years, with the development of my country's construction industry, high-grade concrete is gradually entering the construction market because of its high strength, good integrity and low weight, especially in bridge engineering. However, due to the use of a lower water-binder ratio and a larger amount of cementitious material, high-grade concrete has the problems of high viscosity and slow flow speed in application. [0003] Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, strong plasticity, small slump loss, low shrinkage, green environmental protection and environmental friendliness, and has become an e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B24/16C04B24/26C08F283/06C08F220/06C08F228/02C04B103/30
Inventor 杨海华
Owner 南通瑞特建筑材料有限公司
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