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A kind of super early strength polycarboxylate water reducer and preparation method thereof

A technology of early-strength polycarboxylate and strong polycarboxylate, which is applied in the field of ultra-early-strength polycarboxylate water reducer and its preparation, can solve the problems of unsatisfactory concrete construction performance, poor mud resistance, and large loss of concrete slump. problems, to achieve the effect of improving the steric hindrance effect, good soil resistance, and increasing the water reducing rate

Active Publication Date: 2018-02-09
GUANGDONG REDWALL NEW MATERIALS
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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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  • A kind of super early strength polycarboxylate water reducer and preparation method thereof
  • A kind of super early strength polycarboxylate water reducer and preparation method thereof
  • A kind of super early strength polycarboxylate water reducer and preparation method thereof

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Effect test

Embodiment 1

[0068] An embodiment of the preparation method of the reactive macromonomer of the present invention includes the following steps:

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

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

[0071] 3) Add 1.0 mol of trimethylamine and 0.01 g of hydroquinone to the glass flask, raise the temperature to 75°C, and slowly add dropwise the trimethylamine solution containing 0.5 mol of the methoxy reactive intermediate de...

Embodiment 2

[0073] An embodiment of the preparation method of the reactive macromonomer of the present invention includes the following steps:

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

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

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

Embodiment 3

[0078] An embodiment of the preparation method of the reactive macromonomer of the present invention includes the following steps:

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

[0080] 2) Into a 500ml four-neck glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dripping device, add 1.0mol of the methoxy hydroxy intermediate synthesized in step 1), 8.0mol of maleic anhydride, and 3g of p-methyl Benzenesulfonic acid and 0.01g hydroquinone, stirred, reacted at 170°C for 10 hours to obtain the reaction product methoxy PEG active intermediate;

[0081] 3) Add 1.5 mol of tripropylamine and 0.01 g of hydroquinone to the glass flask, raise the temperature to 80°C, and slowly drop the tripropylamine solution containing 0.75 mol of the methoxy PEG active intermediate de...

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Abstract

The invention discloses a super-early-strength PCE (polycarboxylate ether) superplasticizer and a preparation method thereof. The super-early-strength PCE superplasticizer has cationic charges in the molecular structure, promotes the cement hydration reaction, accelerates the strength development of hardened concrete and has the super-early-strength function; the PCE superplasticizer has unique cement particle dispersion capacity, high superplasticizing rate and good concrete resistance due to the unique amphipathic structure and steric hindrance effect of the superplasticizer.

Description

Technical field [0001] The invention belongs to the field of polycarboxylic acid water reducer, and particularly relates to a super early strength polycarboxylic acid 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 pollution-free. Concrete water-reducing admixtures are the most widely used and most used concrete admixtures. 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 the concrete mixture . PCEs water-reducing agent is an anionic surfactant, which is mixed into cement paste, adsorbs on the surface of cement particles with cations, and dissociates into hydrophilic and lipophilic organic anionic gro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C04B24/26
Inventor 张小富赵利华仲璇白淑英
Owner GUANGDONG REDWALL NEW MATERIALS
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