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Hydrophobically modified viscosity-reducing polycarboxylate superplasticizer and preparation method thereof

A technology of hydrophobic modification and polycarboxylate, which is applied in the field of polycarboxylate water reducer, can solve the problems of reducing polycarboxylate adsorption, dispersion, unfavorable concrete strength growth, unfavorable polymerization reaction conversion rate, etc., to achieve favorable Concrete strength, beneficial to the discharge of air bubbles, and the effect of reducing hydrophilicity

Inactive Publication Date: 2019-03-29
CCCC SHEC WUHAN PORT NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned technical schemes have successfully prepared a viscosity-reducing polycarboxylate superplasticizer by introducing hydrophobically modified polyether macromonomers or hydrophobic small monomers, but the synthesis process of the hydrophobically modified polyether macromonomers used is complicated. Or if the hydrophobicity is too strong and the water solubility is low, an emulsifier such as alkylphenol polyoxyethyl ether is needed to assist in dispersion, which is not conducive to the improvement of the conversion rate of the polymerization reaction. It is not conducive to the increase of concrete strength, and the small hydrophobic monomer used not only has the problems of poor water solubility and low conversion rate, but also has the problem of low viscosity reduction effect of polycarboxylate superplasticizer when the dosage is low. It will greatly reduce the adsorption and dispersion of polycarboxylic acid, etc.

Method used

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  • Hydrophobically modified viscosity-reducing polycarboxylate superplasticizer and preparation method thereof
  • Hydrophobically modified viscosity-reducing polycarboxylate superplasticizer and preparation method thereof
  • Hydrophobically modified viscosity-reducing polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Preparation of hydrophobically modified allyl polyethylene glycol: under nitrogen protection, add 1.0 mol of allyl polyethylene glycol with a molecular weight of 718 into the reaction kettle, stir and heat up to 70°C, add sodium hydroxide As a catalyst, slowly add 1.0mol of 1-bromopropane after reacting for 15min, react at 70°C for 3.0h, add 2.0mol of deionized water, and adjust the pH to 4.8-5.2 with glacial acetic acid, continue to react for 0.5h, and the reaction is complete Dry to obtain white solid hydrophobically modified allyl polyethylene glycol;

[0032] (2) Preparation of hydrophobically modified viscosity-reducing polycarboxylate superplasticizer: methallyl polyoxyethylene polyoxypropylene ether with a molecular weight of 1902, hydrophobically modified allyl polyethylene glycol, and acrylic acid Add acrylic acid and deionized water with a total molar weight of 10% to the reaction kettle, stir and dissolve at 10°C to obtain a solution; Water mixed solutio...

Embodiment 2

[0034] (1) Preparation of hydrophobically modified allyl polyethylene glycol: under the protection of nitrogen, add 1.0 mol of allyl polyethylene glycol with a molecular weight of 806 into the reaction kettle, stir and heat up to 70°C, add sodium hydroxide As a catalyst, slowly add 1.0mol of 1-bromobutane after reacting for 20min, react at 70°C for 3.0h, add 2.3mol of deionized water, and adjust the pH to 4.8-5.2 with glacial acetic acid, continue to react for 0.5h, react After drying, a white solid hydrophobically modified allyl polyethylene glycol is obtained;

[0035] (2) Preparation of hydrophobically modified viscosity-reducing polycarboxylate water reducer: methallyl polyoxyethylene polyoxypropylene ether with a molecular weight of 1958, hydrophobically modified allyl polyethylene glycol, and acrylic acid Add acrylic acid and deionized water with a total molar weight of 10% into the reaction kettle, stir and dissolve at 15°C to obtain a solution; Water mixed solution, the...

Embodiment 3

[0037] (1) Preparation of hydrophobically modified allyl polyethylene glycol: under nitrogen protection, add 1.0 mol of allyl polyethylene glycol with a molecular weight of 806 into the reaction kettle, stir and heat up to 75°C, add sodium hydroxide As a catalyst, slowly add 1.0mol of 1-bromopentane after reacting for 15min, react at 75°C for 3.5h, add 2.3mol of deionized water, and adjust the pH to 4.8~5.2 with glacial acetic acid, continue to react for 0.5h, react Complete drying to obtain white solid hydrophobically modified allyl polyethylene glycol;

[0038] (2) Preparation of hydrophobically modified viscosity-reducing polycarboxylate superplasticizer: methallyl polyoxyethylene polyoxypropylene ether with a molecular weight of 2084, hydrophobically modified allyl polyethylene glycol, and acrylic acid Add acrylic acid and deionized water with a total molar mass of 8% to the reaction kettle, stir and dissolve at 20°C to obtain a solution; Water mixed solution, the droppin...

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Abstract

The invention discloses a hydrophobically modified viscosity-reducing polycarboxylate superplasticizer and a preparation method thereof. The method includes the steps of: adding methyl allyl polyoxyethylene polyoxypropylene ether, hydrophobically modified allyl polyethylene glycol, acrylic acid and deionized water into a reaction kettle, and performing stirring and dissolving to obtain a solutionA; adding hydrogen peroxide into the solution A, also adding a deionized water mixed solution of acrylic acid and ascorbic acid dropwise, and then carrying out heat preservation reaction to obtain a solution B; adding liquid alkali into the solution B, and adjusting the pH value to 6-8, thus obtaining the hydrophobically modified viscosity-reducing polycarboxylate superplasticizer. The hydrophobically modified viscosity-reducing polycarboxylate superplasticizer prepared according to the invention has good dispersibility, slump retention and reinforcement, also has excellent viscosity-reducingperformance, and can greatly improve the comprehensive performance of high-performance or ultrahigh performance concrete.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a hydrophobically modified viscosity-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer, as the third generation superplasticizer product, has the advantages of low dosage, high water reducing rate, good slump retention, strong designability of molecular structure, simple process, green and environmental protection, and easy industrialization. Indispensable key component in concrete. However, the high-performance or ultra-high-performance concrete with high strength and high durability has high viscosity and low fluidity of the mixture due to the high amount of adhesive material and low water-binder ratio, which makes the mixture difficult to discharge, low pumpability, and slow strength growth. , greatly limiting its promotion and application. If the molecular structure d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F4/40C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F4/40C08F283/065C08F220/06
Inventor 高玉军李顺凯明阳沈尔卜韦鹏亮王文荣
Owner CCCC SHEC WUHAN PORT NEW MATERIALS
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