Polycarboxylate superplasticizer for reducing viscosity of high-grade concrete and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of polycarboxylic acid water reducing agent and its preparation, can solve the problems of complicated production, long reaction time, etc. Effect

Active Publication Date: 2017-02-15
BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 104371081A discloses a method for preparing a fast-dispersing viscosity-reducing polycarboxylate cement dispersant. The invention is based on the use of unsaturated macromonomers containing tertiary amino groups as reducing agents that can participate in polymerization to obtain hyperbranched polycarboxylate cement Dispersant, providing a preparation method of fast dispersing viscosity-reducing polycarboxylate cement dispersant, although the invention has greatly improved the viscosity of concrete, it has the disadvantages of complicated production and long reaction time

Method used

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  • Polycarboxylate superplasticizer for reducing viscosity of high-grade concrete and preparation method thereof
  • Polycarboxylate superplasticizer for reducing viscosity of high-grade concrete and preparation method thereof
  • Polycarboxylate superplasticizer for reducing viscosity of high-grade concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Stir 100 parts of methallyl polyoxyethylene ether, 15 parts of acrylic acid, 10 parts of hydroxyethyl acrylate, and 80 parts of deionized water at room temperature to completely dissolve the reactants, add 1.0 parts of ammonium persulfate, and after 15 minutes Add 0.5 parts of tartaric acid aqueous solution dropwise to the container, control the dropping speed, finish dropping within 2 hours, then add 5.5 parts of viscosity reducing agent propylene glycol, keep the temperature for 1 hour, and finally add 30% sodium hydroxide Adjust the pH of the solution to 7.0, and dilute it with water to obtain a liquid polycarboxylate high-performance water reducer with a solid content of 55% (it can also be diluted to any concentration by adding water), and the product JNCR-P1 is obtained.

Embodiment 2

[0025] 100 parts of isopentenyl polyoxyethylene ether, 10 parts of p-vinylbenzenesulfonic acid, 12 parts of hydroxypropyl acrylate, and 80 parts of deionized water were stirred at room temperature to completely dissolve the reactants, and 0.8 parts of azobisiso Butyronitrile, after 15 minutes, add dropwise an aqueous solution containing 0.3 parts of glucose to the container, control the rate of addition, and finish dropping within 2 hours, then add 4.5 parts of viscosity-reducing regulator glycerol, keep the temperature for 1 hour, and finally add 30 % sodium hydroxide solution to adjust pH=7.0, and dilute with water to obtain a 55% solid-containing liquid polycarboxylate high-performance water reducer (can also be diluted to any concentration with water), and the product JNCR-P2 is obtained.

Embodiment 3

[0027] Mix 100 parts of isohexenyl polyoxyethylene ether, 12 parts of p-vinyl benzoic acid, 14 parts of methyl acrylate, and 80 parts of deionized, and stir at room temperature to completely dissolve the reactants, add 1.0 parts of ammonium persulfate, and then add Add 0.5 parts of an aqueous solution of oxalic acid into the container dropwise, control the rate of addition, and finish dropping within 2 hours, then add 2.5 parts of viscosity-reducing agent 2-methyl-2-acrylamidopropanesulfonic acid, and keep the temperature for 1 hour. Finally, add 30% sodium hydroxide solution to adjust the pH=7.0, and dilute with water to obtain a liquid polycarboxylate high-performance water reducer with 55% solid content (it can also be diluted to any concentration by adding water), and the product JNCR-P3 is obtained.

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Abstract

The invention relates to a polycarboxylate superplasticizer for reducing the viscosity of high-grade concrete and a preparation method thereof. The polycarboxylate superplasticizer is prepared by: adding an initiator into the monomer alkenyl terminated polyoxyethylene ether shown as formula (1), unsaturated acid and unsaturated ester, carrying out random copolymerization reaction through an aqueous solution at room temperature, then adding a viscosity reduction regulator to conduct molecular rearrangement, and employing an alkaline regulator to adjust the product to neutral. The invention also includes a preparation method of the polycarboxylate superplasticizer for reducing the viscosity of high-grade concrete. The polycarboxylate superplasticizer provided by the invention has high water-reducing rate, can achieve good viscosity reducing effect when applied in high-grade concrete, and has the advantages of good adaptability, low gas content, good retainability and good pumpability.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer and a preparation method thereof, in particular to a polycarboxylate water reducer for reducing the viscosity of high-grade concrete and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has become a widely used superplasticizer because of its simple production process, high water reducing rate, good slump maintenance, and environmental friendliness. However, when encountering high-grade concrete above C50, the concrete will have problems such as increased viscosity and slow flow speed, which will bring difficulties to construction. Usually, the viscosity is reduced by increasing the dosage. However, due to the low water-to-binder ratio, bleeding is easy to occur, and it is necessary to add a viscosity modifier and an air-entraining agent to improve it. Adaptation is more difficult. [0003] CN 103865007A discloses a method for preparing a viscosity-re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F212/14C08F220/14C04B24/26C04B24/16C04B103/30
CPCC04B24/165C04B24/2647C08F283/065C04B2103/302C08F220/281C08F212/14
Inventor 王虎群
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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