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Amino acid esterification product modified polycarboxylic superplasticizer and preparation method thereof

A technology of amino acid ester and water reducing agent, applied in the field of high performance concrete water reducing agent, can solve the problems of long transportation time and large demand

Active Publication Date: 2014-02-19
SHANGHAI TAIJIE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-efficiency retarding polycarboxylate superplasticizers are in great demand in engineering applications, and with the expansion of cities and environmental protection requirements, large-scale commercial concrete mixing plants are mostly set up in the suburbs, and the concrete is mixed and transported to the construction site , the transportation time is often longer, which requires that the concrete should be kept in a retarded state for a long time after mixing

Method used

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  • Amino acid esterification product modified polycarboxylic superplasticizer and preparation method thereof
  • Amino acid esterification product modified polycarboxylic superplasticizer and preparation method thereof
  • Amino acid esterification product modified polycarboxylic superplasticizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0080] Add 100g of aspartic acid and 130.8g of allyl alcohol (molar ratio 1:3) into the reaction vessel, feed HCl gas at 20°C, stir mechanically for 1h, heat to reflux for 30min, and distill under reduced pressure to remove the reaction product. Water and excess propenyl alcohol, the resulting product is the esterification product of aspartic acid.

[0081] In the reaction vessel, sequentially add 300g of modified polyether (TPEG) with a molecular weight of 1000, 200g of purified water and 15.5g of aspartic acid esterification product, raise the temperature to 50-70°C under mechanical stirring, and add the initiator sodium persulfate 4.5g, after stirring evenly, start to drop 90g of acrylic acid and 40g of a 10wt% solution of chain transfer agent thioglycolic acid (mass ratio of chain transfer agent to initiator is about 1:1), dropwise for 60-120min, dropwise Continue to react after 120-180min, stop heating.

[0082] Add NaOH solution with a mass fraction of 30% to adjust the...

Embodiment 2

[0084] Add 100g of phenylalanine and 105g of allyl alcohol (molar ratio 1:3) into the reaction vessel, feed HCl gas at 20°C, stir mechanically for 1h, heat and reflux for 30-60min, and distill under reduced pressure to remove the reaction product Water and excess propenyl alcohol, the resulting product is the esterification product of phenylalanine.

[0085] In the reaction vessel, sequentially add 300g of modified polyether (TPEG) with a molecular weight of 1000, 200g of purified water and 16.5g of aspartic acid esterification product, raise the temperature to 50-70°C under the condition of mechanical stirring, and add the initiator sodium persulfate 4.5g, after stirring evenly, start to drop 90g of acrylic acid and 40g of a 10wt% solution of chain transfer agent thioglycolic acid (mass ratio of chain transfer agent to initiator is about 1:1), dropwise for 60-120min, dropwise Continue to react after 120-180min, stop heating.

[0086] Add NaOH solution with a mass fraction of...

Embodiment 3

[0088] Add 100g of aspartic acid and 130.8g of allyl alcohol (molar ratio 1:3) into the reaction vessel, feed HCl gas at 20°C, stir mechanically for 1h, heat to reflux for 30min, and distill under reduced pressure to remove the reaction product. Water and excess propenyl alcohol, the resulting product is the esterification product of aspartic acid.

[0089] Add 300 g of allyl polyethylene glycol with a molecular weight of 2400 and 50 g of sodium methallyl sulfonate into the reaction vessel, add 200 g of water and 16.5 g of aspartic acid esterification product, and heat up to 50-70 °C under mechanical stirring. ℃, add 4.5g of initiator hydrogen peroxide, and start to dropwise add 90g of acrylic acid and 40g of 10wt% solution of chain transfer agent mercaptoacetic acid after stirring evenly (the mass ratio of chain transfer agent to initiator is about 1:1), drop The time is 60-120min, continue to react for 120-180min after the dropwise addition, and stop heating.

[0090] Add N...

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Abstract

The invention provides an amino acid esterification product modified polycarboxylic superplasticizer and a preparation method thereof. The preparation method includes: reacting amino acid with unsaturated alcohol to obtain an esterification product, and reacting the esterification product with an unsaturated carboxylic substance and unsaturated polyether, thus obtaining the amino acid esterification product modified polycarboxylic superplasticizer. After an amino acid esterification product monomer unit is added into the polycarboxylic superplasticizer provided by the invention, the initial fluidity of concrete is not affected, and better coagulation delay and plasticity retaining performance can be achieved.

Description

technical field [0001] The invention relates to a high-performance concrete water reducer, in particular to a slow-release polycarboxylate water reducer. Background technique [0002] Concrete water reducer (also known as superplasticizer, Superplasticizer) refers to an admixture that can reduce the amount of mixing water and increase the strength of concrete under the condition of the workability of concrete and the amount of cement unchanged; , complexation, electrostatic repulsion or three-dimensional repulsion, etc. to hinder or destroy the flocculation structure of cement particles, so as to save the amount of cement while ensuring the workability and strength of concrete. [0003] Traditional water reducing agents can be divided into lignosulfonic acids, polycyclic aromatic salts and water-soluble resin sulfonic acids according to the composition materials. For example, patent CN101665337A discloses a kind of aliphatic high-efficiency modified by lignosulfonate. Water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/24C07C229/36C07C227/18C08F283/06C08F2/38C04B24/12C04B103/30
Inventor 朱伟亮
Owner SHANGHAI TAIJIE CHEM
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