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A kind of anti-montmorillonite high-efficiency amphoteric polycarboxylate water reducer and preparation method thereof

An amphoteric polycarboxylic acid and a water reducing agent technology, applied in the field of concrete water reducing agent, can solve problems such as unfavorable industrial production, cost increase, increase production cost, etc., and achieve the advantages of less addition, high water reduction rate and simple synthesis method. Effect

Inactive Publication Date: 2017-10-20
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are currently two methods to solve this problem: 1. Utilize compounding technology, such as patent application CN104446089A discloses a kind of multi-ion complex salt flocculant, supplemented with stabilizer, corrosion inhibitor, reinforcing agent, prepares a kind of can eliminate Acidic corrosion of flocculants and concrete sludging agent that has side effects on the early strength of concrete. The sludging agent assists polycarboxylate superplasticizer to play a role in water reduction and slump protection; patent application CN104558369A discloses a low relative molecular weight amphoteric The preparation method of the clay inhibitor, through the copolymerization of unsaturated carboxylic acid or acid anhydride, unsaturated sulfonic acid or sulfonate and cationic monomer, synthesizes the amphoteric clay inhibitor, which is used in combination with polycarboxylic acid water reducer to reduce the impact of clay on The consumption of water reducing agent; compounding technology is mainly to reduce the effect of clay on polycarboxylate water reducing agent by preferentially adsorbing on clay or reducing the water absorption rate of clay by synthesizing admixture, but it brings about cost increase
2. Synthesize a polycarboxylate superplasticizer that combines mud resistance and water reducing properties. For example, patent application CN104262548A polymerizes quaternary ammonium salt oligomers and other unsaturated monomers to prepare a mud-resistant polycarboxylate Acid-based water reducer, the water reducer has good dispersibility when the content of clay is within 3%, but the quaternary ammonium salt oligomer needs to be vacuumed and distilled, which increases the production cost and is not conducive to industrial production

Method used

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  • A kind of anti-montmorillonite high-efficiency amphoteric polycarboxylate water reducer and preparation method thereof
  • A kind of anti-montmorillonite high-efficiency amphoteric polycarboxylate water reducer and preparation method thereof
  • A kind of anti-montmorillonite high-efficiency amphoteric polycarboxylate water reducer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Dissolve 0.01mol monomer HPEG-2400 in 20mL distilled water to obtain HPEG-2400 solution; dissolve 0.027mol acrylic acid and 0.003mol SPB in 20mL distilled water to obtain a mixed monomer solution; dissolve 0.80g ammonium persulfate in 24mL of distilled water to obtain a catalyst solution;

[0030](2) Heat the HPEG-2400 solution to 80°C, then drop the mixed monomer solution and the catalyst solution into the HPEG-2400 solution at the same time, and the dropping speed of the mixed monomer solution and the catalyst solution are both 0.6mL / min, The reaction time is 5 hours, the pH is adjusted to 7±1 with a saturated sodium hydroxide solution, and the product concentration is controlled to 30%, so as to obtain a high-efficiency amphoteric polycarboxylate water-reducer resistant to montmorillonite. The water reducing rate of the water reducing agent is 37%; the initial fluidity without clay (montmorillonite) is 247.5mm, and the initial fluidity is reduced by 3% when 1% cl...

Embodiment 2

[0032] (1) Dissolve 0.01mol monomer APEG-2400 in 20mL distilled water to obtain APEG-2400 solution; dissolve 0.018mol acrylic acid and 0.012mol SPB in 28mL distilled water to obtain a mixed monomer solution; dissolve 0.86g ammonium persulfate in 24mL of distilled water to obtain a catalyst solution;

[0033] (2) Heat the APEG-2400 solution to 80°C, then drop the mixed monomer solution and catalyst solution into the APEG-2400 solution at the same time, the dropping speed of the mixed monomer solution and catalyst solution is 0.7mL / min, The reaction time is 4 hours, the pH is adjusted to 7±1 with a saturated sodium hydroxide solution, and the product concentration is controlled to 30%, to obtain a high-efficiency amphoteric polycarboxylate water-reducer resistant to montmorillonite. The water reducing rate of the water reducing agent is 28%, the initial fluidity without clay is 200mm, and the initial fluidity is reduced by 5% when 1% clay is added.

Embodiment 3

[0035] (1) Dissolve 0.01mol monomer TPEG-2400 in 20mL distilled water to obtain TPEG-2400 solution; dissolve 0.024mol methacrylic acid and 0.006mol SPB in 25mL distilled water to obtain a mixed monomer solution; dissolve 0.93g ammonium persulfate Dissolve in 28mL distilled water to obtain a catalyst solution;

[0036] (2) Heat the TPEG-2400 solution to 90°C, then drop the mixed monomer solution and the catalyst solution into the TPEG-2400 solution at the same time, the dropping speed of the mixed monomer solution and the catalyst solution are both 0.5mL / min, The reaction time is 6 hours, the pH is adjusted to 7±1 with a saturated sodium hydroxide solution, and the product concentration is controlled to 30%, so as to obtain a high-efficiency amphoteric polycarboxylate water-reducer resistant to montmorillonite. The water reducing rate of the water reducing agent is 34%, the initial fluidity without clay is 230mm, and the initial fluidity is reduced by 4% when 1% clay is added. ...

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Abstract

The invention belongs to the technical field of concrete water reducing agents, and discloses an anti-montmorillonoid high-efficiency amphiprotic polycarboxylate superplasticizer and a preparation method thereof. The anti-montmorillonoid high-efficiency amphiprotic polycarboxylate superplasticizer is prepared from a monomer A, a monomer B and a monomer C under the action of a catalyst, wherein the monomer A is unsaturated carboxylic acid or acid anhydride; the monomer B is enol polyoxyethylene ether; the monomer C is an SPB monomer containing N<+> cation with triplebond; the SPB monomer is prepared from methacrylic acid dimethylamine ethyl ester and 1,3-propane sultone through reaction. The anti-montmorillonoid high-efficiency amphiprotic polycarboxylate superplasticizer disclosed by the invention has the advantages of high efficient water reduction effect and montmorillonoid resistance.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducers, in particular to a high-efficiency amphoteric polycarboxylate water reducer resistant to montmorillonite and a preparation method thereof. Background technique [0002] Since polycarboxylate superplasticizers were used in Japan in the 1980s, polycarboxylate superplasticizers have become the third generation of high-efficiency water-reducing agents after lignosulfonate and naphthalene-based water-reducing agents due to their low dosage and high-efficiency water-reducing effects. agent. However, different mineral components in the cement system show different charges, and the silicate mineral phase C 3 S and C 2 The surface of S and calcium silicate hydrate (C-S-H) is negatively charged, while the aluminate phase C 3 A and C 4 The AF surface is positively charged. Traditional anionic polycarboxylate superplasticizers are mainly adsorbed on the positively charged aluminate phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F222/06C08F220/38C04B103/30
Inventor 杨锦杰钟振声
Owner SOUTH CHINA UNIV OF TECH
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