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Polycarboxylic acids series concrete high efficiency water reducing agent and synthesizing process

A high-efficiency water-reducing agent and polycarboxylic acid-based technology, which is applied in the field of polymer carboxylic acid grafting-type high-efficiency water-reducing agent and its synthesis, can solve the problems of environment, human body hazards, high equipment requirements, harsh reaction conditions, etc. , to achieve the effect of freeze-thaw resistance and concrete durability improvement, long-term storage without precipitation, and good apparent quality

Inactive Publication Date: 2008-08-20
SHANGHAI SHENLI BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production process is very complicated, the reaction conditions are harsh and difficult to control, and the reaction requires high equipment, which is not conducive to industrial production
In addition, although the Chinese invention patent CN1636922 also discloses a high-efficiency polycarboxylate concrete superplasticizer and its preparation method, toluene is used as a solvent in the first step of the preparation process, and water and toluene are extracted after the reaction is completed. Polyethylene glycol monoacrylate is prepared, the reaction process is more complicated, and the use of organic solvents is harmful to the environment and human body

Method used

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  • Polycarboxylic acids series concrete high efficiency water reducing agent and synthesizing process
  • Polycarboxylic acids series concrete high efficiency water reducing agent and synthesizing process
  • Polycarboxylic acids series concrete high efficiency water reducing agent and synthesizing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Into a 1000mL four-neck flask equipped with a thermometer, a stirrer, and a reflux condenser, add 90g of methacrylic acid, 400g of polyethylene glycol monomethyl ether, 2.7g of concentrated sulfuric acid, 1.5g of p-toluenesulfonic acid and an appropriate amount of polymerization inhibitor agent, feed nitrogen at 120-140° C., keep warm for 3-6 hours, and cool for later use to prepare macromonomer polyethylene glycol monomethyl methacrylate (MPEGMA). In another 1000mL four-neck flask, first add 380g of deionized water, then add 180-240g of MPEGMA, heat at 80-90°C, add 20g of comonomer methacrylic acid, 4.0-10g of initiator ammonium persulfate and chain Transfer agent mercaptoethanol 1 ~ 3g, drop it within 4 ~ 5 hours, continue to heat and mature for 1 ~ 3 hours after the drop, to complete the reaction, remove the system, neutralize with alkali after cooling, and obtain a light brown transparent viscous liquid. The solid content is around 25%.

[0026] When the measured m...

Embodiment 2

[0028] Add 90g of methacrylic acid, 400g of polyethylene glycol monomethyl ether, 5.4g of concentrated sulfuric acid, and an appropriate amount of polymerization inhibitor into a 1000mL four-necked flask equipped with a thermometer, a stirrer, and a reflux condenser. ~140°C, keep warm for 3~6 hours, cool for later use, and prepare macromonomer polyethylene glycol monomethyl methacrylate (MPEGMA). In another 1000mL four-neck flask, first add 380g of deionized water, then add 180-240g of MPEGMA, heat at 80-90°C, add dropwise 20g of comonomer methacrylic acid, 15g of sodium propylene sulfonate, and initiator persulfate Ammonium 4.0 ~ 10g and chain transfer agent mercaptoethanol 1 ~ 2g, drop in 4 ~ 5 hours, continue to heat and mature for 1 ~ 3 hours after the drop, to complete the reaction, remove the system, neutralize with alkali after cooling, and get shallow Brown transparent viscous liquid with a solid content of about 25%.

[0029] It is measured that when the mixing amoun...

Embodiment 3

[0031] Into a 1000mL four-neck flask equipped with a thermometer, a stirrer, and a reflux condenser, add 90g of methacrylic acid, 400g of polyethylene glycol monomethyl ether, 5.2g of p-toluenesulfonic acid, and an appropriate amount of polymerization inhibitor. Nitrogen at 120-140° C., heat preservation for 3-6 hours, and cool for later use to prepare macromonomer polyethylene glycol monomethyl methacrylate (MPEGMA). In another 1000mL four-necked flask, first add 380g of deionized water, then add 180-240g of MPEGMA, heat at 80-90°C, add dropwise comonomer acrylic acid 25g, acrylamide 7g, initiator ammonium persulfate 5.0-10g And chain transfer agent mercaptoethanol 1~2g, drop it within 4~5 hours, continue to heat and mature for 1~3 hours after dropping, to make the reaction complete, remove the system, neutralize it with alkali after cooling, and get light brown transparent viscosity Liquid, the solid content is about 25%.

[0032]It is measured that when the mixing amount i...

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Abstract

The invention relates to a water reducing agent with high efficiency used in polycarboxylate concrete and a synthetic method thereof, which is characterized in that: plyethylene glycol methylacrylic acid single armor esterification (MPEGMA) macromonomer synthesized by (methyl) acrylic and polyethylene glycol monomethyl ether added with catalyst and other (methyl) acrylic or (methyl) allyl sodium monomer are grafted and copolymerizated to synthesize into binary or polybasic copolymer comprising carboxyl, sulfonic group and polyoxyethylene chain side under the effect of initiator and chain transfer agent. The products synthetically prepared by the invention has the advantages of high water reducing ratio, low chlorine and low alkali; the cement mixture is high in fluidity and good in mixability, and can restrain slump loss effectively, when 0.7 to 1.2 percent by weight of cement material is added. The water reducing agent with high efficiency used in polycarboxylate concrete is simple in technology, easy in control of reaction condition and reasonable in cost, does not pollute environment, and can be used as the important component of high performance concrete, marine concrete, nuclear power station concrete and anticorrosion concrete and is widely used in the field of industry, civil building, water conservancy, road traffic and nuclear power engineering.

Description

technical field [0001] The invention relates to a high-efficiency polycarboxylate concrete superplasticizer and a synthesis method thereof, in particular to a high-molecular carboxylic acid grafted high-efficiency water reducer suitable for concrete admixtures and a synthesis method thereof. Background technique [0002] Concrete is a widely used material in civil engineering, construction, water conservancy and high-speed railway projects. At present, the newly built commercial concrete centralized mixing plants in major cities in my country can provide stable and high-quality concrete, which can undoubtedly speed up the progress of construction and improve the engineering quality. quality. With the development of commercial concrete, the technological progress of concrete admixture has been promoted. Concrete admixture has become an indispensable and useful component in concrete. It plays a central role in concrete production technology and is the key to determining the qua...

Claims

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Application Information

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IPC IPC(8): C04B24/28C08F220/26C08F220/06C08F220/38C08G65/48C08G64/30C04B103/30
CPCC04B2103/302C04B24/2647C04B2111/0075C04B2111/26C04B2111/1062C04B24/165C04B24/2605C04B24/2694
Inventor 马明元吴菊珍曹炳根屠洁梅金川
Owner SHANGHAI SHENLI BUILDING MATERIAL
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