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Early-strength viscosity-reducing polycarboxylate superplasticizer containing three viscosity-reducing functional groups and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of retardation, high viscosity, low early strength and low viscosity, etc., and achieve high water reducing rate, significant early strength and viscosity reduction effect

Active Publication Date: 2019-05-21
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned technical defects that exist, the present invention introduces the active macromonomer D with the function of reducing viscosity and the active macromonomer E with the function of early strength in the molecular structure according to the polymer structure design theory, so that the concrete has a higher Early strength and low viscosity, thus solving the technical problems of slow setting and high viscosity of polycarboxylate water reducer in the application of concrete prefabricated components

Method used

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  • Early-strength viscosity-reducing polycarboxylate superplasticizer containing three viscosity-reducing functional groups and preparation method thereof
  • Early-strength viscosity-reducing polycarboxylate superplasticizer containing three viscosity-reducing functional groups and preparation method thereof
  • Early-strength viscosity-reducing polycarboxylate superplasticizer containing three viscosity-reducing functional groups and preparation method thereof

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Embodiment 1

[0062] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0063] (1) Synthesis of viscosity-reducing active macromonomer D:

[0064] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 30 mol of The oxyalkane was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain a viscosity-reducing and shrinking-reducing active macromonomer D.

[0065] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0066] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and chain transfer agent in water to obtain solution 2, ...

Embodiment 2

[0070] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0071] (1) Synthesis of viscosity-reducing active macromonomer D:

[0072]In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol and 2 g of sodium hydride, stir under nitrogen protection, and add 30 mol dropwise at a constant speed at 90 ° C. , 3 Epoxy ethyl 3-phenylpropionate, after 3 hours of dropwise addition, continue the reaction at 100°C for 8 hours to obtain the active macromonomer D with reduced viscosity and reduced shrinkage.

[0073] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0074] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and...

Embodiment 3

[0078] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0079] (1) Synthesis of viscosity-reducing active macromonomer D:

[0080] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 15 mol of ring Oxyalkane and 15mol ethyl 2,3 epoxy 3-phenylpropionate were added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the active macromonomer D with reduced viscosity and reduced shrinkage.

[0081] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0082] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and ...

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Abstract

The invention provides an early-strength viscosity-reducing polycarboxylate superplasticizer. Compared with the viscosity-reducing polycarboxylate superplasticizer synthesized in the prior art, the early-strength viscosity-reducing polycarboxylate superplasticizer synthesized in the invention has the advantages of excellent viscosity-reducing effect and no influence on the water reducing rate dueto synergistic effects between components and between functional groups; at the same time, due to the introduction of a large number of hydrophobic alkyl groups, phenyl groups and ester groups in a PEG side chain, the HLB value is reduced, the surface activity effect is enhanced, and the polycarboxylate superplasticizer provided by the invention has good shrinkage reducing performance. The polycarboxylate superplasticizer provided by the invention has good effects of promoting cement hydration and improving early strength development of concrete. Early-strength and hydrophobic viscosity-reducing functional groups of the polycarboxylate superplasticizer provided by the invention are located on a side chain, and the early-strength and viscosity-reducing effects of the polycarboxylate superplasticizer can be adjusted by adjusting the content of viscosity-reducing and early-strength functional groups, but a dispersing effect of dispersing groups on cement particles is not affected, so thatthe dispersing and water-reducing effects of the polycarboxylate superplasticizer are not affected.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an early-strength viscosity-reducing polycarboxylate water reducer containing three viscosity-reducing functional groups and a preparation method thereof. Background technique [0002] In recent years, with the increase of my country's infrastructure construction, high-grade concrete is gradually entering the building material market due to its high strength, good integrity and low weight, especially in bridge engineering. However, due to the use of a large amount of gel material and low water-binder ratio, high-grade concrete has the problems of high viscosity and slow flow speed, which in turn causes problems in concrete mixing, transportation, pumping and construction, which largely limits high-strength super Promotion and application of high-strength concrete. [0003] For engineers and technicians, the high-strength ultra-high-strength concrete viscosity problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C08F283/06C08F220/06C08F2/38C08G65/28C04B103/30
Inventor 张小富白淑英
Owner GUANGDONG REDWALL NEW MATERIALS
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