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Preparation method and application for amphoteric polycarboxylate water reducer containing anions and cations

A technology of amphoteric polycarboxylic acid and water reducer, which is applied in the field of preparation of concrete additives, can solve the problems of reducing the dispersion performance of polycarboxylate high-efficiency water reducer, and achieve unique dispersion ability, high water reducing rate, and slump Good degree of retention

Active Publication Date: 2014-08-20
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of harmful substances like montmorillonite seriously reduces the dispersion performance of commonly used polycarboxylate superplasticizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An embodiment of the anionic polycarboxylate water-reducer of the present invention, the anionic polycarboxylate water-reducer described in this embodiment is prepared by the following method:

[0035] (1) Synthesis of chlorinated allyl polyoxyethylene ether macromonomer: In a 1000ml four-neck flask equipped with a stirrer, thermometer and reflux condenser, add 600ml tetrahydrofuran and allyl polyoxyethylene ether (molecular weight: 2500~5000), 1,6-dichlorohexane, polymerization inhibitor (hydroquinone) and KOH powder, raise the temperature to tetrahydrofuran reflux, react under reflux conditions for 24~30h, cool down to room temperature, filter to remove KOH powder, distilled under reduced pressure to remove tetrahydrofuran to obtain chlorinated allyl polyoxyethylene ether macromonomer;

[0036] (2) Synthesis of cationic quaternary ammonium salt allyl polyoxyethylene ether macromonomer: Add triethylamine and polymerization inhibitor (hydroquinone) into a three-necked f...

Embodiment 2

[0040] An embodiment of the anionic polycarboxylate water-reducer of the present invention, the anionic polycarboxylate water-reducer described in this embodiment is prepared by the following method:

[0041] (1) Synthesis of chlorinated allyl polyoxyethylene ether macromonomer: In a 1000ml four-neck flask equipped with a stirrer, thermometer and reflux condenser, add 600ml tetrahydrofuran and allyl polyoxyethylene ether (molecular weight: 2500~5000), 1,6-dichlorohexane, polymerization inhibitor (hydroquinone) and KOH powder, raise the temperature to tetrahydrofuran reflux, react under reflux conditions for 24~30h, cool down to room temperature, filter to remove KOH powder, distilled under reduced pressure to remove tetrahydrofuran to obtain chlorinated allyl polyoxyethylene ether macromonomer;

[0042] (2) Synthesis of cationic quaternary ammonium salt allyl polyoxyethylene ether macromonomer: Add trimethylamine and polymerization inhibitor (hydroquinone) into a three-necked ...

Embodiment 3

[0046] An embodiment of the anionic polycarboxylate water-reducer of the present invention, the anionic polycarboxylate water-reducer described in this embodiment is prepared by the following method:

[0047] (1) Synthesis of chlorinated allyl polyoxyethylene ether macromonomer: In a 1000ml four-neck flask equipped with a stirrer, thermometer and reflux condenser, add 600ml tetrahydrofuran and allyl polyoxyethylene ether (molecular weight: 2500~5000), 1,6-dichlorohexane, polymerization inhibitor (hydroquinone) and KOH powder, raise the temperature to tetrahydrofuran reflux, react under reflux conditions for 24~30h, cool down to room temperature, filter to remove KOH powder, distilled under reduced pressure to remove tetrahydrofuran to obtain chlorinated allyl polyoxyethylene ether macromonomer;

[0048] (2) Synthesis of cationic quaternary ammonium salt allyl polyoxyethylene ether macromonomer: Add N,N-dimethylethylamine and polymerization inhibitor (hydroquinone) into a three...

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Abstract

The invention discloses a preparation method and application for an amphoteric polycarboxylate water reducer containing anions and cations. The method is designed through a high-molecular structure, and the quaternary-ammonium-salt type carboxylate water reducer terminated with a cation is synthesized by performing modification on allyl polyethenoxy ether. According to the synthesized water reducer, anionic charges and cationic charges are both introduced into the molecular structure of the water reducer, when the water reducer is added into cement slurry, anionic charges at the main chain are adsorbed on the surface of cement particles with positive charges, and the anionic charges at the terminals of side chains are adsorbed on the surface of cement particles with negative charges, so that cement particles are dispersed. Cations are capable of inhibiting expansion of soil, so that adsorption of soil to additives is reduced. Because of the unique amphoteric structure of the water reducer, the water reducer possesses unique dispersing capability, high water reducing rate, good slump maintenance property and excellent performances. Also, the invention provides the amphoteric polycarboxylate water reducer prepared by employing the method, and application of the water reducer to concrete.

Description

technical field [0001] The invention relates to a method for preparing an additive for concrete, in particular to a method for preparing a polycarboxylate water reducer for concrete. Background technique [0002] Polycarboxylate water reducer, as a new type of high-performance water reducer launched after naphthalene, aliphatic and sulfamate-based water reducers, has high water-reducing rate, good dispersion of cement particles, and the dosage It has outstanding advantages such as low concrete shrinkage, strong molecular structure adjustability, and high performance potential. It has been successfully applied to a series of major projects such as high-speed railways, bridges, tunnels, and dams. However, polycarboxylate high-efficiency superplasticizers also encounter many technical difficulties in practical applications, such as adaptability to cement / admixtures, sensitivity to the amount of superplasticizer and water consumption, and aggregate mud content, temperature, etc....

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F222/06C08F228/02C08G65/333C08G65/337C04B24/16C04B103/30
Inventor 张小富白淑英
Owner GUANGDONG REDWALL NEW MATERIALS
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