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Synthetic method for maleic polycarboxylic water reducer

A technology of water reducing agent and polycarboxylic acid, applied in the field of synthesis of water reducing agent, can solve problems such as poor slump retention performance

Inactive Publication Date: 2011-10-05
赵争艳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The overall performance of the water reducer is better, but the slump retention performance is poor

Method used

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  • Synthetic method for maleic polycarboxylic water reducer
  • Synthetic method for maleic polycarboxylic water reducer
  • Synthetic method for maleic polycarboxylic water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Weigh 50g polyethylene glycol (PEG) into a single-necked flask, add toluene (20% of the PEG mass), distill under reduced pressure with a water pump, and control the temperature of the water bath at 65°C until there are no bubbles in the flask. At a certain water bath temperature, add maleic anhydride (MA) and PEG (1000) or methoxy polyethylene glycol (MPEG (1000)) treated by toluene vacuum distillation at a molar ratio of 1:1 The esterification reaction in a single-neck flask was 5h. The synthetic macromonomer PEG-MA or MPEG-MA is formulated into an aqueous solution of ρ=50%. Acrylic acid (AA), styrene (ST) / sodium p-styrene benzene sulfonate (SSS), MPEG-MAA ρ=50% aqueous solution A according to the molar ratio of 8:0.02:1, prepare ρ=50% An aqueous solution of initiator. Put the prepared PEG-MA / MPEG-AA into a three-necked flask, and then add 10% solution A and 20% initiator solution. The temperature of the water bath was controlled at 80°C, and the reaction ...

Embodiment 2

[0021] Example 2: Weigh 50g polyethylene glycol (PEG) into a single-necked flask, add toluene (20% of the PEG mass), distill under reduced pressure with a water pump, and control the temperature of the water bath at 65°C until there are no bubbles in the flask. At a certain water bath temperature, add maleic anhydride (MA) and PEG (1000) or methoxy polyethylene glycol (MPEG (1000)) treated by toluene vacuum distillation at 1:1.1 into the single-necked flask. The reaction is 5h. The synthetic macromonomer PEG-MA or MPEG-MA is formulated into an aqueous solution of ρ=50%. Prepare acrylic acid (AA), styrene (ST) / sodium p-styrene benzene sulfonate (SSS) at a molar ratio of 5:0.02:1, MPEG-MAA ρ=50% aqueous solution A, prepare ρ=50% An aqueous solution of initiator. Put the prepared PEG-MA / MPEG-AA into a three-necked flask, and then add 10% solution A and 20% initiator solution. The temperature of the water bath was controlled at 80°C, and the reaction was carried out for 1 hour. ...

Embodiment 3

[0022] Example 3: Weigh 50g polyethylene glycol (PEG) into a single-necked flask, add toluene (20% of the PEG mass), distill under reduced pressure with a water pump, and control the temperature of the water bath at 65°C until there are no bubbles in the flask. At a certain water bath temperature, add maleic anhydride (MA) and PEG (1000) or methoxy polyethylene glycol (MPEG (1000)) treated by toluene vacuum distillation at 1:1.2 into the single-necked flask. The reaction is 5h. The synthetic macromonomer PEG-MA or MPEG-MA is formulated into an aqueous solution of ρ=50%. Prepare acrylic acid (AA), styrene (ST) / sodium p-styrene benzene sulfonate (SSS), MPEG-MAA ρ=50% aqueous solution A according to 3:0.02:1, prepare ρ=50% initiator Aqueous solution. Put the prepared PEG-MA / MPEG-AA into a three-necked flask, and then add 10% solution A and 20% initiator solution. The temperature of the water bath was controlled at 80°C, and the reaction was carried out for 1 hour. Mix the rema...

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Abstract

The invention discloses a synthetic method for maleic polycarboxylic water reducer. The method is characterized in that: maleic anhydride (MA) and polyethylene glycol (PEG) / methoxy polyethylene glycol (MPEG) are used as the raw materials to synthesize polyethylene glycol maleate monoester (PEG-MA) / methoxy polyethylene glycol maleate monoester (MPEG-MA); and PEG-MA / MPEG-MA, AA / AANa and methoxy polyethylene glycol metacrylic acid ester (MPEG-MAA) are used as the raw materials to synthesize a maleic polycarboxylic water reducer containing carboxyl and a polyoxyethylene (PEO) side chain structure. According to the invention, the molecular structure of the polycarboxylic water reducer introduces carboxyl and PEO with a long side chain, which enables electrostatic repulsion among cement particles to be increased, dispersibility, i.e. retentivity of dispersion of cement to be improved, and steric hindrance among cement particles is realized, thereby realizing low slump loss. Simultaneously, the preparation method provided in the invention has the advantages of a simple process, mild reaction and wide sources of cheap raw materials.

Description

Technical field [0001] The invention relates to the synthesis of a water reducing agent, in particular to the synthesis of a maleic acid polycarboxylic acid type water reducing agent. Background technique [0002] Water reducing agent refers to an admixture that can reduce the mixing water consumption and increase the strength of concrete under the conditions of constant workability and cement consumption; or save cement consumption under the conditions of constant workability and strength. [0003] Polycarboxylic acid water reducer is widely used in the construction industry because of its low content, high water reduction rate and low concrete slump loss. In the case of low content of polycarboxylic acid water reducing agent, the water reduction rate of cement is high, the fluidity of cement is large, the strength of concrete is high, and the service life is long. At present, acrylic acid and polyethylene glycol methyl ether are firstly esterified and then copolymerized at home ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08G65/48C04B24/26
Inventor 赵争艳
Owner 赵争艳
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