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Super early strength polycarboxylate water-reducer, and preparation method thereof

A technology of early-strength polycarboxylate and strong polycarboxylate is applied in the field of super-early-strength polycarboxylate water reducer and its preparation, which can solve the problem of unsatisfactory concrete construction performance, poor mud resistance, large concrete slump loss, etc. problem, to achieve the effect of good soil resistance, accelerated strength development, and high water reduction rate

Active Publication Date: 2016-02-17
GUANGDONG REDWALL NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity and diversity of concrete raw materials in my country, especially when the soil content of sand and gravel is large, the slump loss of concrete is large. The polycarboxylate water reducer produced by TPEG, due to the connection between the PEG side chain and the soil Intercalation reaction makes it poor in mud resistance and cannot meet the requirements of concrete construction performance

Method used

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  • Super early strength polycarboxylate water-reducer, and preparation method thereof
  • Super early strength polycarboxylate water-reducer, and preparation method thereof
  • Super early strength polycarboxylate water-reducer, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0068] An embodiment of the preparation method of the active macromonomer of the present invention comprises the following steps:

[0069] 1) In a closed autoclave, inject 1.0mol methanol, 80mol ethylene oxide, 20mol epichlorohydrin and 3g sodium hydride respectively, stir, and react at 80°C for 8 hours to obtain the reaction product methoxyhydroxy PEG intermediate ;

[0070] 2) In a 500ml four-neck glass flask equipped with a stirrer, thermometer, reflux condenser, and dropping device, add 0.9mol of methoxyhydroxyl PEG intermediate synthesized in step 1), 7.2mol of acrylic acid, 3g of p-methyl Benzenesulfonic acid and 0.01g hydroquinone were stirred and reacted at 110°C for 15h to obtain the active intermediate of the reaction product methoxy PEG;

[0071] 3) Add 1.0 mol of trimethylamine and 0.01 g of hydroquinone to the glass flask, heat up to 75° C., and slowly add dropwise the trimethylamine solution containing 0.5 mol of the methoxy active intermediate described in step...

Embodiment 2

[0073] An embodiment of the preparation method of the active macromonomer of the present invention comprises the following steps:

[0074] 1) Into a closed autoclave, respectively inject 1 mol of methanol, 5 mol of ethylene oxide, 1 mol of epichlorohydrin and 2 g of sodium hydride, stir, and react at 80° C. for 2 hours to obtain the reaction product methoxyl hydroxyl intermediate;

[0075] 2) In a 500ml four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 0.8mol of the methoxyl hydroxyl intermediate, 0.85mol of acrylic acid, and 3g of p-toluene synthesized in step 1). Sulfonic acid and 0.01g of hydroquinone, stirred, and reacted at 70°C for 3 hours to obtain the active intermediate of the reaction product methoxy PEG;

[0076] 3) Add 0.1mol triethylamine and 0.01g hydroquinone to the glass flask, heat up to 80°C, slowly add dropwise the triethylamine solution containing 0.5mol of the methoxy PEG active intermediate in s...

Embodiment 3

[0078] An embodiment of the preparation method of the active macromonomer of the present invention comprises the following steps:

[0079] 1) In a closed autoclave, inject 1mol methanol, 200mol ethylene oxide, 150mol epichlorohydrin and 2g sodium respectively, stir, and react at 150°C for 10h to obtain the reaction product methoxyl hydroxyl intermediate;

[0080] 2) In a 500ml four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1.0mol of the methoxyl hydroxyl intermediate synthesized in step 1), 8.0mol of maleic anhydride, and 3g of p-formaldehyde Base benzenesulfonic acid and 0.01g hydroquinone, stir, and react at 170°C for 10h to obtain the active intermediate of the reaction product methoxy PEG;

[0081] 3) Add 1.5mol tripropylamine and 0.01g hydroquinone to the glass flask, heat up to 80°C, slowly add dropwise the tripropylamine solution containing 0.75mol of the methoxy PEG active intermediate in step 2) (wherein,...

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Abstract

The invention discloses a super early strength polycarboxylate water-reducer, and a preparation method thereof. The molecular structure of the super early strength polycarboxylate water-reducer contains cationic charges which are capable of promoting cement hydration reaction, and accelerating strength development of concrete, so that super early strength effect is achieved; and the super early strength polycarboxylate water-reducer possesses excellent cement particle dispersing capacity, high water-reducing rate, and excellent soil resistance because of an unique amphipathic structure and steric-hinerance effects.

Description

technical field [0001] The invention belongs to the field of polycarboxylate water reducer, in particular to a super early strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, the research and production of concrete admixtures have tended to develop in the direction of high performance and no pollution. Concrete water reducer is the most widely used and most used concrete admixture. Water reducing agent mixed into fresh concrete can destroy the flocculation structure of cement particles, play a role in dispersing cement particles and cement hydration particles, thereby releasing free water in the flocculation structure and increasing the fluidity of concrete mixture . PCEs superplasticizers are anionic surfactants, which are mixed into cement paste, adsorbed on the surface of cement particles with cations, and dissociate into organic anion groups with hydrophilic and lipophilic effects. [0003] The molecul...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/06C08F216/14C08F220/56C08F220/58C08F222/06C04B24/26C04B103/30
CPCC04B24/165C04B24/2605C08F290/062C04B2103/302C08F222/02C08F220/585C08F216/145C08F220/06C08F222/06C08F220/56
Inventor 张小富赵利华白淑英
Owner GUANGDONG REDWALL NEW MATERIALS
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