Method for preparing slump-retaining type polycarboxylic acid series high-performance water reducing agent in one step

A polycarboxylate-based, high-performance technology, applied to the one-step preparation of concrete slump-preserving polycarboxylate-based high-performance water-reducers, in the field of slump-preserving polycarboxylate-based high-performance water-reducers The efficiency and slump retention are not very good, the production process is cumbersome, the crosslinking effect is not ideal, etc., to achieve good slump retention ability, improve slump loss, and good slump retention effect

Active Publication Date: 2011-07-13
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only the production process is cumbersome, but also many cross-linking agents have poor water solubility. If the cross-linking effect is not ideal, it will greatly affect the state of the water reducing agent, and turbidity and stratification will occur.
[0008] Patent CN 101830663 A reports a slump-preserving polycarboxylate water reducer and its preparation method, using dimethylaminoethyl methacrylate, allyl Polyethylene glycol (APEG2400) and maleic anhydride were used as raw materials to synthesize polycarboxylic acid-based water reducers. Although dimethylaminoethyl methacrylate was introduced, due to the problems of APEG itself, the water reducing rate and retention The collapse is not very good

Method used

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  • Method for preparing slump-retaining type polycarboxylic acid series high-performance water reducing agent in one step
  • Method for preparing slump-retaining type polycarboxylic acid series high-performance water reducing agent in one step
  • Method for preparing slump-retaining type polycarboxylic acid series high-performance water reducing agent in one step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Add 390 parts of methoxy-terminated allyl polyalkylene glycol ether and 210 parts of deionized water into the reaction kettle, raise the temperature to 55°C and stir to make them all dissolve in water; then add 1.6 parts of hydrogen peroxide and stir 0.5h. Dissolve 0.7 parts of sodium sulfite in 190 parts of deionized water as dropwise addition (1); take 18 parts of acrylic acid and 3.6 parts of 2-acrylamide-2-methylpropanesulfonic acid and dissolve them in 170 parts of deionized water as dropwise addition ( 2); within 3h~4h, drop evenly into the reactor at the same time, and ensure that the dropwise addition (1) is completed 0.5h later than the dropwise addition (2). After the addition, keep stirring at 55°C for 1.5h, cool down to room temperature and add 18 parts of 30% liquid caustic soda, continue stirring for 0.5h to obtain the product (TB-1).

Embodiment 2

[0052] Add 340 parts of butoxy-terminated allyl polyalkylene glycol ether and 210 parts of deionized water into the reaction kettle, raise the temperature to 65°C and stir to make them all dissolve in water; then add 1.4 parts of hydrogen peroxide and stir 0.5h. Dissolve 0.9 parts of sodium ascorbate in 200 parts of deionized water as dropwise addition (1); take 30 parts of methacrylic acid and 6.2 parts of sodium methacrylate sulfonate and dissolve them in 185 parts of deionized water as dropwise addition (2); Within 3h~4h, drop evenly into the reactor at the same time, and ensure that the dropwise addition (1) is 0.5h later than the dropwise addition (2). After the addition, keep stirring at 65°C for 2 hours, add 26 parts of ethanolamine, and continue stirring for 0.5 hours to obtain the product (TB-2).

Embodiment 3

[0054] Add 380 parts of ethoxy-capped allyl polyalkylene glycol ether and 220 parts of deionized water into the reaction kettle, raise the temperature to 75°C and stir to make them all dissolve in water; then add 2.5 parts of tert-butyl Hydrogen peroxide was stirred for 0.5h. Take 1.0 parts of ascorbic acid dissolved in 180 parts of deionized water as dropwise (1); take 10 parts of acrylic acid, 8 parts of hydroxyethyl methacrylate and 3.5 parts of sodium allyl sulfonate dissolved in 145 parts of deionized water as drop

[0055] Add (2); within 3h~4h, drop evenly into the reactor at the same time, and ensure that the dropwise addition of (1) is 0.5h later than the dropwise addition of (2). After the addition, keep stirring at 75°C for 2 hours, add 35 parts of 30% liquid caustic soda, and continue stirring for 0.5 hours to obtain the product (TB-3).

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Abstract

The invention relates to a method for preparing a slump-retaining type polycarboxylic acid series high-performance water reducing agent in one step. The method comprises the following steps of: dissolving unsaturated polyoxyethylene ether into water, heating to 50 to 80 DEG C, adding oxidant solution and stirring uniformly; adding reducing agent solution and comonomer solution dropwise respectively to perform polymerization; preserving the heat and curing for 1 to 3 hours; and cooling to room temperature, adding an alkaline compound and adjusting the pH value to be 6.5 to 7 to obtain the slump-retaining type polycarboxylic acid series high-performance water reducing agent. In the method, unsaturated bond-containing allyl for hydrogen on terminated hydroxyl of the original unsaturated polyoxyethylene ether is substituted, so that the terminal group of alkoxy polyethylene glycol is changed from the original active hydroxyl into the conventional inert alkyl, byproducts of copolymerized products are greatly reduced, molecular weight distribution is narrowed, and the synthetized water reducing agent has a high water-reducing ratio and a high slump-retaining property.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to a slump-preserving polycarboxylate high-performance water reducer, in particular to a concrete slump-preserving polycarboxylate high-performance water reducer that does not use organic solvents. A one-step preparation method of an aqueous solution. Background technique [0002] With the rise of my country's nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure, especially the planning and implementation of the national railway passenger dedicated line network project, the market demand for polycarboxylic acid-based high-performance admixtures continues to grow. Compared with traditional high-efficiency water-reducing agents, polycarboxylate-based high-performance water-reducing agents have the advantages of strong slump retention, high water-reducing rate, and flexible molecular structure. However, in the face o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C04B24/16C04B103/30
Inventor 陈国新祝烨然黄国泓杜志芹沈燕平杨立志徐唯唯
Owner NANJING RUIDI HIGH TECH
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