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Modified ether polycarboxylic acid water reducing agent and preparation method thereof

A technology of ether polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of large slump loss, low concrete water reducing rate, difficult control of molecular weight, etc., and achieves improved adaptability and double bond retention. The effect of high rate and high product stability

Active Publication Date: 2012-02-22
GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to synthesize macromonomers first, and then polymerize, and the preparation process is complicated, and the cost is high, which is not conducive to popularization and application in medium and low-strength grade concrete that accounts for more than 80% of the market; 2. Allyl polyoxyethylene ether and Unsaturated monomers such as acrylic acid and maleic anhydride are used in aqueous solution to prepare polycarboxylate water reducers by free radical copolymerization. This method has the disadvantages of wide molecular weight distribution and difficult control of molecular weight. The activity of vinyl ether is low, the water reducing rate of the mixed concrete is low, and the slump loss is large

Method used

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  • Modified ether polycarboxylic acid water reducing agent and preparation method thereof
  • Modified ether polycarboxylic acid water reducing agent and preparation method thereof
  • Modified ether polycarboxylic acid water reducing agent and preparation method thereof

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Embodiment 1

[0036] The modified ether polycarboxylate water reducer described in the present invention has the following monomer composition and proportioning ratio:

[0037] Monomer A: methallyl polyoxyethylene ether (TPEG), molecular weight 2400, accounting for 95% of the total monomer weight;

[0038] Monomer B: acrylic acid (AA), accounting for 4% of the total monomer weight;

[0039] Monomer C: 2-acrylamido-2-methylpropanesulfonic acid (AMPS), accounting for 1% of the total weight of the monomers.

[0040] The preparation method of above-mentioned modified ether polycarboxylate water reducer can be expressed as follows:

[0041] Add 95g of methallyl polyoxyethylene ether monomer into the reactor. When the temperature rises to 30-50°C, add 95g of deionized water to dissolve it; ℃, while adding dropwise a mixed aqueous solution made of 4g of acrylic acid monomer, 1g of 2-acrylamido-2-methylpropanesulfonic acid monomer, and 6g of deionized water, 0.1g of mercaptopropionic acid, and 20...

Embodiment 2

[0043] The modified ether polycarboxylate water reducer described in the present invention has the following monomer composition and proportioning ratio:

[0044] Monomer A: methallyl polyoxyethylene ether (TPEG), molecular weight 2400, accounting for 65% of the total monomer weight;

[0045] Monomer B: acrylic acid (AA), accounting for 30% of the total monomer weight;

[0046] Monomer C: 2-acrylamido-2-methylpropanesulfonic acid (AMPS), accounting for 5% of the total weight of the monomers.

[0047] The preparation method of above-mentioned modified ether polycarboxylate water reducer can be expressed as follows:

[0048] Add 65g of methallyl polyoxyethylene ether monomer into the reactor. When the temperature rises to 30-50°C, add 30g of deionized water to dissolve it; ℃, while adding dropwise a mixed aqueous solution made of 30g acrylic acid monomer, 5g 2-acrylamido-2-methylpropanesulfonic acid monomer and 24g deionized water, 2g mercaptoacetic acid, 40g 10% ammonium pers...

Embodiment 3

[0050] The modified ether polycarboxylate water reducer described in the present invention has the following monomer composition and proportioning ratio:

[0051] Monomer A: methallyl polyoxyethylene ether (TPEG), molecular weight 2400, accounting for 50% of the total monomer weight;

[0052] Monomer B: acrylic acid (AA), accounting for 40% of the total monomer weight;

[0053] Monomer C: 2-acrylamido-2-methylpropanesulfonic acid (AMPS), accounting for 10% of the total weight of the monomers.

[0054] The preparation method of above-mentioned modified ether polycarboxylate water reducer can be expressed as follows:

[0055]Add 50g of methallyl polyoxyethylene ether monomer into the reactor. When the temperature rises to 30-50°C, add 15g of deionized water to dissolve it; ℃, while adding dropwise the mixed aqueous solution made of 40g acrylic acid monomer, 10g 2-acrylamido-2-methylpropanesulfonic acid monomer and 20g deionized water, 4g mercaptoacetic acid, 80g 10% potassium ...

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Abstract

The present invention discloses a modified ether polycarboxylic acid water reducing agent, which is prepared by carrying out free radical induced copolymerization for three monomers, wherein the three monomers comprise 50-95% of methyl allyl polyoxyethylene ether, 4-40% of acrylic and 1-10% of 2-acrylamide-2-methylpro panesulfonic acid (AMPS). With the modified ether polycarboxylic acid water reducing agent of the present invention, the methyl allyl polyoxyethylene ether monomer is introduced, such that the synthesized water reducing agent product has higher water reducing rate and slump loss resistance than the conventional ether polycarboxylic acid water reducing agent; the water reducing rate of the synthesized water reducing agent product is further improved due to the introduced 2-acrylamide-2-methylpro panesulfonic acid (AMPS); the prepared concrete has characteristics of low dosage, high fluidity, low slump time losing, good workability and adequate early strength; with the synthesized water reducing agent, the adaptability of the product to raw materials with different sources is substantially improved.

Description

technical field [0001] The invention relates to a modified ether polycarboxylate water reducer and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] Polycarboxylate high-performance water reducer is the third generation of high-performance water reducer after naphthalene series. It is formed by copolymerization of unsaturated monomers containing carboxyl groups and other monomers. Its structure mainly refers to those after the 1980s. The developed comb-shaped molecular structure is composed of a main chain with carboxylic acid groups and a polyether side chain. It has low dosage, good slump performance, low concrete shrinkage, strong adjustability in molecular structure, and high performance. It is the development direction of high-performance concrete admixtures and a worldwide research hotspot. [0003] At present, this new type of high-performance concrete admixture has been widely used in some large brid...

Claims

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Application Information

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IPC IPC(8): C08F216/20C08F220/06C08F220/58C08F2/38C04B24/26C04B103/30
Inventor 徐海军祝雯钟开红
Owner GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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