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Low-dosage high-water-reduction type polycarboxylic acid water reducer and preparation method thereof

A technology of polycarboxylate and water reducing agent, which is applied in the field of concrete admixture, can solve the problems of unsuitable development, high esterification reaction temperature, adverse environmental impact, etc., and achieve high slump retention, cement adaptability, and reaction cycle Short, low-equipment-required effect

Inactive Publication Date: 2012-07-11
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: the esterification temperature is higher, the reaction time is longer, and the energy consumption is large. In the esterification, a volatile organic solvent is used, such as toluene is used as a water-carrying agent to improve the esterification rate; medium
The use of these organic solvents will have adverse effects on the environment and do not meet the requirements of sustainable development

Method used

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  • Low-dosage high-water-reduction type polycarboxylic acid water reducer and preparation method thereof
  • Low-dosage high-water-reduction type polycarboxylic acid water reducer and preparation method thereof
  • Low-dosage high-water-reduction type polycarboxylic acid water reducer and preparation method thereof

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Effect test

Embodiment 1

[0029] Embodiment 1: Monomer A is methyl alkenyl polyoxyethylene polyoxypropylene ether, molecular weight is 2400; Monomer B is maleic anhydride; Monomer C is sodium methacrylate; Initiator D is sodium persulfate .

[0030] Add 24.46kg of monomer A, 4.1kg of monomer B, 0.42kg of monomer C and 70kg of distilled water into the reactor, heat up to 40°C while stirring, and add 1.01kg of sodium persulfate into the reactor after the monomers are dissolved , stir until dissolved. Then the monomer was reacted at 80°C for 4h, 90°C for 0.5h, and finally cooled to room temperature, and adjusted to pH 7 with 30% sodium hydroxide solution to obtain a polycarboxylic acid-based water reducer PC with a solid content of 30%. 1.

Embodiment 2

[0031] Example 2: Monomer A is methyl alkenyl polyoxyethylene polyoxypropylene ether with a molecular weight of 2800; Monomer B is itaconic acid; Monomer C is sodium propylene sulfonate; Initiator D is ammonium persulfate.

[0032]Add 21.87kg of monomer A, 5.76kg of monomer B, 0.80kg of monomer C and 30kg of distilled water into the reactor, heat up to 40°C while stirring, and add 1.56kg of ammonium persulfate into the reactor after the monomers are dissolved , stir until dissolved. Then the monomer was reacted at 75°C for 3.0h, and finally cooled to room temperature, and the pH was adjusted to 7 with 30% sodium hydroxide solution to obtain a polycarboxylate water reducer PC-2 with a solid content of 50%.

Embodiment 3

[0033] Example 3: Monomer A is methyl alkenyl polyoxyethylene ether with a molecular weight of 2400; Monomer B is fumaric acid; Monomer C is sodium methacrylate; initiator D is sodium persulfate.

[0034] Add 25.16kg of monomer A, 2.77kg of monomer B, 0.51kg of monomer C and 45kg of distilled water into the reactor, heat up to 40°C while stirring, and add 1.56kg of sodium persulfate into the reactor after the monomers are dissolved , stir until dissolved. Then the monomer was reacted at 75°C for 3.0 hours, and finally cooled to room temperature, and the pH was adjusted to 7 with 30% sodium hydroxide solution to obtain a polycarboxylate water reducer PC-3 with a solid content of 40%.

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Abstract

The invention discloses a low-dosage high-water-reduction type polycarboxylic acid water reducer and a 'one step one kettle' preparation method thereof, and belongs to the technical field of cement concrete water reducers. The polycarboxylic acid water reducer adopts the 'one step one kettle' method; a block type polyoxyalkylene ether monomer A, an unsaturated acid or unsaturated acid derivative monomer B, an alkenyl sulfonic acid monomer C and an azo or peroxy peroxy D are once thrown into a reaction kettle; free radicals are polymerized in an aqueous solution; and finally, the aqueous solution is neutralized by using an alkaline solution, so as to obtain the polycarboxylic acid water reducer. The polycarboxylic acid water reducer prepared by adopting the method disclosed by the invention has excellent performance such as easily-obtained material, simple formula, low dosage, high water reduction, high slump loss resistance, strong cement adaptability, and the like. The preparation method has the advantages of simple process, short reaction period, wild reaction condition and low requirement for equipment, is simple and convenient to operate and is easy to control; and the polymerization is conducted in the aqueous solution, so that three wastes cannot be discharged and the preparation method belongs to clean production.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a low-volume, high-water-reducing polycarboxylate water-reducer and a "one-step-one-pot" preparation method thereof. Background technique [0002] High-performance concrete is widely used around the world due to its high strength, high durability, high workability and volume stability. Among them, water reducing agent is one of the five indispensable components of high-performance concrete. Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, large degree of freedom in molecular structure design, and environmental friendliness. focus of development. [0003] At present, there are two methods for producing polycarboxylate-based water reducers—one-step method and two-step method. The one-step method uses allyl alcohol polyoxyethylene ether and acid anhydride as the main raw materials, and is a polyether-type water reducer formed b...

Claims

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Application Information

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IPC IPC(8): C08F283/06C04B24/16C04B103/30
Inventor 刘云海张志宾熊国宣罗明标花榕
Owner EAST CHINA UNIV OF TECH
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