A viscosity-reducing polycarboxylate water-reducer containing three viscosity-reducing functional groups, its preparation method and application

Abstract

The invention provides a viscosity-reducing active macromonomer, and the invention also provides a viscosity-reducing polycarboxylate water-reducer. The viscosity-reducing polycarboxylate water-reducer synthesized by the invention has a The functional groups cooperate with each other, and compared with the viscosity-reducing polycarboxylate superplasticizer synthesized in the prior art, 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 groups, ester groups and phenyl groups in the PEG side chain, the HLB value is effectively reduced, the surface activity effect is enhanced, and the shrinkage effect is good. The concrete added with the product of the present invention has a shrinkage Low rate, no cracking. The viscosity-reducing hydrophobic functional group is located on the side chain, and the viscosity-reducing effect of the water reducer can be adjusted through the content of the viscosity-reducing functional group, but it does not affect the content of the dispersing group and the dispersion effect on cement particles, so it does not affect the water reducing effect. agent dispersion and water-reducing effect.

Description

technical field

[0001] The invention relates to the technical field of concrete admixtures, in particular to a viscosity-reducing polycarboxylate water reducer containing three viscosity-reducing functional groups and its preparation method and application. 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 ...

Examples

Embodiment 1

[0052] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0053] (1) Synthesis of viscosity-reducing active macromonomer D:

[0054] 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.

[0055] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0056] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent in water to obtain solution 3, Under normal tempe...

Embodiment 2

[0060] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0061] (1) Synthesis of viscosity-reducing active macromonomer D:

[0062] 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 the viscosity-reducing active macromonomer D.

[0063] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0064] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing a...

Embodiment 3

[0068] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0069] (1) Synthesis of viscosity-reducing active macromonomer D:

[0070] 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 viscosity-reducing active macromonomer D.

[0071] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0072] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent ...

technical field

[0001] The invention relates to the technical field of concrete admixtures, in particular to a viscosity-reducing polycarboxylate water reducer containing three viscosity-reducing functional groups and its preparation method and application. 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 ...

Examples

Embodiment 1

[0052] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0053] (1) Synthesis of viscosity-reducing active macromonomer D:

[0054] 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.

[0055] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0056] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent in water to obtain solution 3, Under normal tempe...

Embodiment 2

[0060] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0061] (1) Synthesis of viscosity-reducing active macromonomer D:

[0062] 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 the viscosity-reducing active macromonomer D.

[0063] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0064] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing a...

Embodiment 3

[0068] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0069] (1) Synthesis of viscosity-reducing active macromonomer D:

[0070] 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 viscosity-reducing active macromonomer D.

[0071] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0072] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent ...

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