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Early strength and viscosity reduction type polycarboxylate superplasticizer containing double viscosity-reduction functional groups and preparation method of polycarboxylate superplasticizer

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: 2019-05-17
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the above-mentioned technical defects that exist, the present invention introduces the active macromonomer D with viscosity-reducing function and the active macromonomer E with early-strength function in the molecular structure according to the macromolecular structure design theory, so that the concrete has a higher Excellent 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 and viscosity reduction type polycarboxylate superplasticizer containing double viscosity-reduction functional groups and preparation method of polycarboxylate superplasticizer
  • Early strength and viscosity reduction type polycarboxylate superplasticizer containing double viscosity-reduction functional groups and preparation method of polycarboxylate superplasticizer
  • Early strength and viscosity reduction type polycarboxylate superplasticizer containing double viscosity-reduction functional groups and preparation method of polycarboxylate superplasticizer

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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 the viscosity-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 dissolve the reducin...

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, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 30 mol of shrink water at a constant speed at 90 ° C. Glycerin butyrate 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.

[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 chain transfer agent in wa...

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 glycidyl butyrate were added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[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 chain transfer agent in water to obtain sol...

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Abstract

The invention provides an early strength and viscosity reduction type polycarboxylate superplasticizer. Components and functional groups of the synthesized early strength and viscosity reduction typepolycarboxylate superplasticizer have a synergistic effect, compared with the early strength type polycarboxylate superplasticizer synthesized in the prior art, the early strength and viscosity reduction type polycarboxylate superplasticizer have excellent early strength and viscosity reduction effects while the water reducing rate is not affected, meanwhile, a large quantity of hydrophobic alkylgroups, phenyl groups and ester groups are introduced into PEG side chains, so that HLB value is reduced, the surface activity effect is enhanced, and the polycarboxylate superplasticizer has good shrinkage reducing performance. The superplasticizer has good effects of promoting cement hydration and improving early strength development of concrete; the superplasticizer has good water reducing rateand slump retaining capacity. Early strength and hydrophobic viscosity reduction functional groups of the superplasticizer are located on the side chains, so that the early strength and viscosity reduction effects of the superplasticizer can be adjusted by adjusting content of the viscosity reduction and early strength functional groups while the cement particle dispersing effect of dispersing groups is not affected, and the dispersing and water reducing effects of the 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 double 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 proble...

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 GUANGDONG REDWALL NEW MATERIALS
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