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An alkyl-containing early-strength viscosity-reducing polycarboxylate water reducer and its preparation method

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of low early strength, low viscosity, retardation and high viscosity, and achieve the effects of low shrinkage, improved early strength development, and excellent viscosity reduction effect.

Active Publication Date: 2021-11-16
广西红墙新材料有限公司
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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 alkyl-containing early-strength viscosity-reducing polycarboxylate water reducer and its preparation method
  • An alkyl-containing early-strength viscosity-reducing polycarboxylate water reducer and its preparation method
  • An alkyl-containing early-strength viscosity-reducing polycarboxylate water reducer and its preparation method

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Effect test

Embodiment 1

[0061] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0062] (1) Synthesis of viscosity-reducing active macromonomer D:

[0063] 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 1 mol of cyclo The oxyalkane was added dropwise in 2 hours, and the reaction was continued at 90°C for 6 hours to obtain the active macromonomer D of viscosity-reducing and shrinkage-reducing type.

[0064] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0065] 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 obtai...

Embodiment 2

[0069] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0070] (1) Synthesis of viscosity-reducing active macromonomer D:

[0071] 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 10 mol of ring The oxyalkane was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0072] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0073] 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 dissolve the...

Embodiment 3

[0077] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0078] (1) Synthesis of viscosity-reducing active macromonomer D:

[0079] 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 10 hours to obtain the active macromonomer D of viscosity-reducing and shrinkage-reducing type.

[0080] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0081] 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 solu...

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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 synthesized early-strength polycarboxylate superplasticizer, the early-strength and viscosity-reducing effects are superior, but the water-reducing rate is not affected. At the same time, due to the introduction of a large number of hydrophobic alkyl groups in the PEG side chain, the HLB value is reduced. Enhanced surface active effect, with good shrinkage reduction performance. The water reducing agent of the present invention has good effects of promoting cement hydration and improving the early strength development of concrete; the water reducing agent of the present invention has good water reducing rate and slump retention ability. The early strength and hydrophobic viscosity-reducing functional groups of the water-reducing agent of the present invention are located on the side chain, and the early-strength and viscosity-reducing effects of the water-reducing agent can be adjusted by adjusting the content of the viscosity-reducing and early-strength functional groups, but it does not affect the effect of the dispersing group on the cement particles. The dispersing effect of the water reducing agent will not affect the dispersing and water reducing effect of the water reducing agent.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an alkyl-containing early-strength viscosity-reducing polycarboxylate water reducer 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 is a long-standing technical problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
Inventor 张小富白淑英
Owner 广西红墙新材料有限公司