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An early-strength viscosity-reducing polycarboxylate water reducer containing three viscosity-reducing functional groups and its preparation method

A polycarboxylic acid and water reducing agent technology, applied in the field of concrete admixtures, can solve the problems of retardation, high viscosity, low viscosity in early strength, etc., and achieve the effects of improving early strength development, low shrinkage, and promoting cement hydration

Active Publication Date: 2021-07-20
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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  • An early-strength viscosity-reducing polycarboxylate water reducer containing three viscosity-reducing functional groups and its preparation method
  • An early-strength viscosity-reducing polycarboxylate water reducer containing three viscosity-reducing functional groups and its preparation method
  • An early-strength viscosity-reducing polycarboxylate water reducer containing three viscosity-reducing functional groups and its preparation method

Examples

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Effect test

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 drop 30 mol of ring 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, and...

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. , Ethyl 3-epoxy 3-phenylpropionate 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.

[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 c...

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 water-reducer. The early-strength viscosity-reducing polycarboxylate water-reducer synthesized by the present invention has synergistic effects between components and functional groups, which is different from that of the prior art. Compared with the synthetic viscosity-reducing polycarboxylate superplasticizer, the viscosity-reducing effect is superior and the water-reducing rate is not affected. At the same time, due to the introduction of a large number of hydrophobic alkyl, phenyl and ester groups in the PEG side chain, the HLB value, enhanced surface active effect, has good shrinkage reduction performance. The water reducing agent of the present invention has a good effect of promoting cement hydration and improving the early strength development of concrete; the water reducing agent of the present invention has early strength and hydrophobic viscosity-reducing functional groups located on the side chain, and can adjust the content of viscosity-reducing and early-strength functional groups. Adjust the early strength and viscosity reduction effect of the superplasticizer, but it does not affect the dispersion effect of the dispersing group on the cement particles, so it does not affect the dispersion and water reduction effect of the superplasticizer.

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 Patents(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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