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Preparation method of environmental protection type water reducer for improving cement concrete performance

A cement concrete, environment-friendly technology, applied in the field of preparation of environment-friendly water reducing agent, can solve problems such as unfavorable development, environmental pollution, and large loss over time

Inactive Publication Date: 2008-04-23
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of water reducing agent has good working performance on fresh concrete, but due to the large loss of concrete slump over time, and the use of formaldehyde as a monomer in the preparation process, it will inevitably pollute the environment and is not conducive to further development. develop

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 60 g of polyethylene glycol with a molecular weight of 400, 50 g of water, and 0.5 g of concentrated sulfuric acid into a four-neck flask, stir and raise the temperature, and drop 23.2 g of 50% maleic acid solution at 70 ° C, drop it in 40 minutes, and control the temperature Stir and reflux at 87°C for 1 hour; then add 11.52g of sodium methacrylate and 52g of water; weigh 0.324g of ammonium persulfate to make a 20% solution, add 21.6g of acrylic acid, and drop the mixture into In the above solution, control the dropping rate for 1.5 hours, continue the reaction for 2.5 hours, cool to room temperature after the reaction, adjust the pH to 7 with concentrated ammonia water, and obtain the water reducer for cement concrete of the present invention.

Embodiment 2

[0025] Add 120g of polyethylene glycol with a molecular weight of 800, 80g of water, and 0.91g of concentrated sulfuric acid into a four-neck flask, stir and raise the temperature, add 10g of acrylic acid dropwise at 70°C, drop it in 30 minutes, and control the temperature at 87°C and stir and reflux for 1 hour Then add 11.52g of sodium methylpropene sulfonate, add 82g of water; then weigh 0.3375g of ammonium persulfate to make a 20% solution, then add 45g of 50% maleic acid, and drop the mixture of the two into the above solution, Control the dropping speed for 1.5 hours, continue to react for 3 hours, cool to room temperature after the reaction, and adjust the pH to 7 with concentrated ammonia water to obtain the water reducer for cement concrete of the present invention.

Embodiment 3

[0027] Add 150g of polyethylene glycol with a molecular weight of 2000, 100g of water, and 1.1g of concentrated sulfuric acid into a four-neck flask, stir and raise the temperature, drop in 7g of methacrylic acid at 70°C, drop it in 30 minutes, and control the temperature at 87°C to stir and reflux 1 hour; then add 5.76g of sodium methacrylate, and add 70g of water; then weigh 0.189g of ammonium persulfate to make a 20% solution, then add 12.6g of acrylic acid, drop the mixture of the two into the above solution, and control After the dripping speed is 1 hour, the reaction is continued for 2.5 hours. After the reaction is completed, it is cooled to room temperature, and the pH is adjusted to 7 with concentrated ammonia water to obtain the water reducer for cement concrete of the present invention.

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Abstract

The present invention relates to a preparation method of environment-protecting type water-reducing agent capable of improving cement concrete performance, belonging to the field of high-molecular polymer and cement concrete functional adjuvant preparation process technology. Said method is characterized by using polyethylene glycol (molecular weight 400-4000), acrylic acid or maleic acid and sodium methyl propyl sulfonate, etc. as main raw material, adopting continuous two-step synthesis method and utilizing the processes of polymerization and esterification reaction so as to obtain the invented polymer high-effective cement concrete water-reducing agent.

Description

technical field [0001] The present invention relates to a preparation method of an environment-friendly water reducer for improving the performance of cement concrete, more specifically, the present invention relates to a method of preparing high molecular polymers with different side chain lengths, the polymer is used for cement concrete high-efficiency water reducer. The invention belongs to the technical field of preparation technology of high molecular polymer and cement concrete functional additive. Background technique [0002] The development of water reducers directly affects and determines the development of concrete. From ordinary water reducers to high-efficiency water reducers, concrete has experienced the development from plastic concrete to fluid concrete. Concrete water reducing agent can not only affect the working performance of concrete, but also improve the structure of concrete microscopically, so that it can meet the construction requirements, mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B24/04
Inventor 张月星陆文雄曹栋樑王律党俐
Owner SHANGHAI UNIV
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