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Alkyl-containing early strength viscosity reduction type polycarboxylic acid water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, used in the field of concrete admixtures, can solve the problems of retardation, high viscosity, low viscosity in early strength, etc., and achieve the effect of reducing viscosity, reducing HLB value, and high water reducing rate

Active Publication Date: 2019-05-14
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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  • Alkyl-containing early strength viscosity reduction type polycarboxylic acid water reducer and preparation method thereof
  • Alkyl-containing early strength viscosity reduction type polycarboxylic acid water reducer and preparation method thereof
  • Alkyl-containing early strength viscosity reduction type polycarboxylic acid water reducer and preparation method thereof

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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 reduction type polycarboxylic acid water reducer. According to the synthesized early strength viscosity reduction type polycarboxylic acid water reducer, cooperative interaction is present between components and between functional groups. Compared with the early strength viscosity reduction type polycarboxylic acid water reducer synthesized in theprior art, early strength and viscosity reduction effects are excellent, water-reducing rate cannot be affected, a lot of hydrophobic alkyl is introduced in a PEG (polyethylene glycol) side chain, aHLB (hydrophile-lipophile balance) value is reduced, surface activity effects are enhanced, and good shrinkage reducing performance is achieved. The water reducer has the advantages that cement hydration is effectively facilitated, and early strength development of concrete is improved. The water reducer has good water-reducing rate and holding capacity of slump degree. Early strength and hydrophobic viscosity reduction functional groups are positioned on the side chain, the contents of viscosity reduction and early strength functional groups are adjusted, so that early strength and viscosityreduction effects of the water reducer can be adjusted, dispersion effects of cement particles cannot be affected by dispersion groups, and dispersion and water reducing effects of the water reducer cannot be affected.

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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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
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