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A kind of nanometer hyperbranched monomer, early strength polycarboxylate water reducing agent and preparation method thereof

A technology of hyperbranched monomer and polycarboxylic acid, applied in the field of early-strength polycarboxylate water reducing agent and preparation, nano-hyperbranched monomer, can solve the problems of poor early-strength effect and low water-reducing effect, and achieve early-strength Strong effect enhancement, avoids retardation effect, promotes hydration effect

Active Publication Date: 2022-08-02
上海抚佳精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low water-reducing effect and poor early-strength effect under low temperature conditions in the early-strength polycarboxylate water-reducer in the prior art, thereby providing a nano-hyperbranched single Body, early-strength polycarboxylate water reducer and preparation method

Method used

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  • A kind of nanometer hyperbranched monomer, early strength polycarboxylate water reducing agent and preparation method thereof
  • A kind of nanometer hyperbranched monomer, early strength polycarboxylate water reducing agent and preparation method thereof
  • A kind of nanometer hyperbranched monomer, early strength polycarboxylate water reducing agent and preparation method thereof

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Embodiment 1

[0069] The present embodiment provides a kind of nanometer hyperbranched monomer, and its preparation method is as follows:

[0070] Dissolve 0.1 mol of acrylic acid and 0.12 mol of triaminomethane in 100 mL of toluene, add 20 mL of concentrated sulfuric acid, and condense and reflux for 2 hours; then add 0.23 mol of MDA to the reaction system, and condense and reflux for 1.5 hours; finally, add 6.1 mol to the system mol triaminomethane, condensed and refluxed for 2 hours, placed in a vacuum drying oven, purified at -0.1 MPa and 120 ° C for 1 hour, and taken out to obtain nano-hyperbranched monomers. Through nuclear magnetic identification, the structural formula of the nanometer hyperbranched monomer is as follows:

[0071]

Embodiment 2

[0073] The present embodiment provides a kind of nanometer hyperbranched monomer, and its preparation method is as follows:

[0074] Dissolve 0.1mol acrylic acid and 0.11mol tris(4-aminophenyl)amine in 100mL cyclohexane, add 0.002mol p-toluenesulfonic acid to condense and reflux for 1.5h; then add 0.21mol ethylenediaminetetraacetic acid to the reaction system , condensed and refluxed for 1.5h; finally added 6.2mol of tris(4-aminophenyl)amine to the system, condensed and refluxed for 2h, placed it in a vacuum drying box, purified it at -0.1MPa and 90℃ for 1.5h, and then took out the nanometer Hyperbranched monomers. Through nuclear magnetic identification, the structural formula of the nanometer hyperbranched monomer is as follows:

[0075]

Embodiment 3

[0077] The present embodiment provides a kind of nanometer hyperbranched monomer, and its preparation method is as follows:

[0078] Dissolve 0.1 mol of acrylic acid and 0.12 mol of 1,3,5-triaminobenzene in 100 mL of tetrahydrofuran, add 0.001 mol of phosphotungstic acid to condense and reflux for 1.5 h; then add 0.22 mol of 1,2-propanediamine to the reaction system Tetraacetic acid, condensed and refluxed for 1.5 hours; finally added 6.3 mol of 1,3,5-triaminobenzene to the system, condensed and refluxed for 2 hours, placed it in a vacuum drying box, purified it at -0.08MPa and 100 °C for 2 hours, and then took it out to obtain nanometers. Hyperbranched monomers. Through nuclear magnetic identification, the structural formula of the nanometer hyperbranched monomer is as follows:

[0079]

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Abstract

The invention provides a nanometer hyperbranched monomer, an early-strength polycarboxylate water reducer and a preparation method; the nanometer hyperbranched monomer does not need to add an emulsifier when used to prepare a polycarboxylate water reducer, and uses nanometer The hyperbranched structure and steric hindrance of the hyperbranched monomer can adjust and optimize the main chain structure of the polycarboxylate superplasticizer; and the prepared polycarboxylate superplasticizer has a nanoparticle size of 40-120nm, which can improve the performance of the polycarboxylate superplasticizer. Dispersibility of polycarboxylate superplasticizer in concrete; high structural branching increases the steric hindrance between polycarboxylate superplasticizer molecules and cement particles, and increases the water-reducing effect of polycarboxylate superplasticizer; At the same time, a large number of amide groups introduced into the molecular structure of the polycarboxylate superplasticizer by the nano-hyperbranched monomers can promote C 2 S and C 3 The hydration effect of S improves the early strength of concrete; and the amide group is more stable than the ester group under the high alkaline condition of the concrete, avoiding the retardation effect caused by the hydrolysis of the ester group.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a nanometer hyperbranched monomer, an early-strength polycarboxylate water reducer and a preparation method. Background technique [0002] Concrete admixtures are chemical substances that are added during concrete mixing and can significantly improve the performance of concrete. The characteristics of concrete admixtures are many varieties, small dosage, low investment, quick effect and remarkable technical and economic benefits. With the continuous progress of science and technology, concrete admixture has become the fifth important component in concrete besides cement, sand, stone and water. [0003] Early-strength superplasticizer is an external concrete additive that can reduce water and improve early strength. It can accelerate the hydration process of cement, effectively shorten the setting time, accelerate the turnover of precast concrete product formwork and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02C08G83/00C08F283/00C08F283/06C04B24/26C04B24/16C04B103/30C04B103/12
CPCC08G73/028C08G83/005C08F283/00C08F283/065C04B24/2694C04B24/165C04B2103/302C04B2103/12C08F220/06C08F220/54C08F212/08C08F220/585C08F220/56
Inventor 何新耀李玉博
Owner 上海抚佳精细化工有限公司
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