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Preparation method and application of phosphate-group-containing low-molecular-weight water reducing agent for concrete

A concrete water-reducing agent and low-molecular-weight technology, applied in the field of concrete admixtures, can solve the problem of low density of adsorption groups, achieve excellent retardation, increase density and ensure safety.

Active Publication Date: 2018-07-06
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the synthesis of phosphate-based polyether derivatives, mostly monophosphate and a small amount of phosphate diester are formed, and the density of adsorption groups is not high.

Method used

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  • Preparation method and application of phosphate-group-containing low-molecular-weight water reducing agent for concrete
  • Preparation method and application of phosphate-group-containing low-molecular-weight water reducing agent for concrete
  • Preparation method and application of phosphate-group-containing low-molecular-weight water reducing agent for concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The synthesis process of polyether polyol with a molecular weight of 400 (pentaerythritol as the initiator) is as follows: Weigh 136.2 parts of pentaerythritol and 50-100 parts of ethylene glycol dimethyl ether, add them into the reactor and stir evenly, then add 2.7 parts of NaH, continue Under the condition of stirring, 263.8 parts of ethylene oxide was introduced, and the temperature was raised to 80-120°C to carry out the reaction, and the reaction was stopped after the pressure of the system no longer decreased. Then distill under reduced pressure at 80-90°C to remove ethylene glycol dimethyl ether to obtain polyether polyol. The molecular weight measured by GPC is 405, and the molecular weight distribution is 1.03.

[0056] The molar ratio of polyether polyol with a molecular weight of 400 (pentaerythritol as the initiator) and sodium is 1:1.1, the molecular weight of MPEG-Cl is 600, and the molar ratio of MPEG-Cl to polyether polyol is 1.1:1 , the molar ratio of...

Embodiment 2

[0058] The synthetic process of the polyether polyol (pentaerythritol as the initiator) with a molecular weight of 400 is the same as above.

[0059] The molar ratio of polyether polyol with a molecular weight of 400 (pentaerythritol as the initiator) and sodium is 1:1.05, the molecular weight of MPEG-Cl is 1000, and the molar ratio of MPEG-Cl to polyether polyol is 1.2:1 , the molar ratio of phosphorylation reagent to polyether polyol is 3.2:1. Weigh 200 parts of polyether polyol into a three-necked flask, slowly add 12 parts of metal sodium under nitrogen protection and stirring, raise the temperature to 130°C, and react for 3 hours. After the above reaction was completed, the temperature of the reaction system was lowered to 80° C., 600 parts of MPEG-Cl was added, and the reaction was continued for 6 hours. After the above reaction is completed, reduce the temperature of the reaction system to 50-70°C and maintain the temperature range, add 184.4 parts of phosphorylation r...

Embodiment 3

[0061] The synthesis process of polyether polyol with a molecular weight of 450 (xylitol as the initiator) is as follows: Weigh 152.2 parts of xylitol and 50-100 parts of ethylene glycol dimethyl ether, add them into the reactor and stir evenly, and then add 2.7 parts NaH, 297.8 parts of ethylene oxide was introduced under the condition of continuing to stir, and the temperature was raised to 80-120°C to carry out the reaction, and the reaction was stopped after the pressure of the system no longer decreased. Then distill under reduced pressure at 80-90°C to remove ethylene glycol dimethyl ether to obtain polyether polyol. The molecular weight measured by GPC is 458, and the molecular weight distribution is 1.04.

[0062]The molar ratio of polyether polyol with a molecular weight of 450 (xylitol is the initiator) and sodium is 1:1.15, the molecular weight of MPEG-Cl is 1000, and the molar ratio of MPEG-Cl to polyether polyol is 1.2 :1, the molar ratio of phosphorylation reage...

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Abstract

The invention provides a preparation method and application of a phosphate-group-containing low-molecular-weight water reducing agent for concrete. The preparation method can improve the density of phosphate adsorption groups in the water reducing agent, and the prepared water reducing agent has excellent slump loss resistance, water reducing performance, retarding performance and clay tolerance.The preparation method comprises the following steps: (1) reacting a part of hydroxyl groups in polyether polyol of a specific structure with an alkali metal or alkali metal compound to produce an alkali metal salt of polyether polyol; (2) subjecting the alkali metal salt of polyether polyol and chlorinated polyether of a specific structure to an etherification reaction so as to synthesize a polyether intermediate containing hydroxyl groups; and (3) phosphorylating the hydroxyl groups of the polyether intermediate.

Description

technical field [0001] The invention relates to a preparation method and application of a phosphoric acid group-containing low-molecular concrete water reducer, which belongs to the technical field of concrete admixtures. Background technique [0002] With the needs of high-rise and super high-rise buildings, large-scale hydropower projects and other large-volume concrete projects, concrete technology is constantly developing in the direction of high workability, high strength, high durability or special performance. As an indispensable admixture in concrete, water reducing agent is the simplest, most effective and economical technical means to reduce the amount of cement in concrete, improve the utilization rate of industrial waste residue, improve concrete strength, work performance and durability, and is the most simple, effective and economical technical means for modern concrete preparation. The necessary materials and core technologies provide the premise and guarantee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C04B24/28C04B103/30C04B103/40
CPCC04B24/246C04B2103/302C04B2103/408C08G81/00
Inventor 亓帅韩正冉千平王涛杨勇范士敏马建峰刘加平
Owner JIANGSU SOBUTE NEW MATERIALS
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