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Preparation method of modified high-performance polycarboxylic acid water reducing agent

A polycarboxylic acid, high-performance technology, which is applied in the field of preparation of new fine chemical materials, can solve problems such as the small number of reports and the impact on the strength of concrete in the later stage, and achieve simple operation, convenient production and quality control, and low equipment requirements Effect

Inactive Publication Date: 2012-12-12
WUHAN AOWEIBANG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through compounding, the early strength of concrete can be improved to a certain extent, but it has a great influence on the later strength of concrete
At present, there are not many domestic reports on the synthesis of early-strength superplasticizers

Method used

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  • Preparation method of modified high-performance polycarboxylic acid water reducing agent
  • Preparation method of modified high-performance polycarboxylic acid water reducing agent
  • Preparation method of modified high-performance polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of a modified polycarboxylate high-performance water reducer, the steps of which are as follows:

[0028] A. Put 280g of polyethylene glycol monomethyl ether with a molecular weight of 1200, 0.2g each of hydroquinone and phenothiazine, 103g of methacrylic acid, and 2.56g of concentrated sulfuric acid into a reaction vessel, stir evenly, and keep The temperature was 123°C and the reaction was carried out for 5 hours to obtain a mixture of polyethylene glycol monomethyl ether methacrylate and methacrylic acid. After cooling down to 50°C, 360g of water was added to form a solution, and then 5.6g of 30wt% sodium hydroxide solution was added to obtain a mixed solution with a pH of 2-3.

[0029] B. Add 500g of bottom water to the reaction vessel, raise the temperature to 93°C to prepare for reaction, add 370g of the mixed solution of step A and 84g of 4.8wt% ammonium persulfate solution dropwise, control the rate of addition, and finish dropping in 210-23...

Embodiment 2

[0032] A preparation method of a modified polycarboxylate high-performance water reducer, the steps of which are as follows:

[0033] A. Put 280g of polyethylene glycol monomethyl ether with a molecular weight of 1200, 0.15g of hydroquinone and phenothiazine, 80.3g of methacrylic acid, and 2.41g of concentrated sulfuric acid into the reaction vessel, and stir evenly. Keep the temperature at 125°C and react for 6 hours to obtain a mixture of polyethylene glycol monomethyl ether methacrylate and methacrylic acid. After cooling down to 60°C, 360g of water was added to form a solution, and then 5.6g of 30wt% sodium hydroxide solution was added to obtain a mixed solution with a pH of 2-3.

[0034] B. Add 480g of bottom water to the reaction vessel, raise the temperature to 94°C to prepare for reaction, and simultaneously add 370g of the mixed solution of step A and 84g of 4.8wt% ammonium persulfate solution dropwise, control the rate of addition, and finish dropping in 220-240 minu...

Embodiment 3

[0037] A preparation method of a modified polycarboxylate high-performance water reducer, the steps of which are as follows:

[0038] A. Put 280g of polyethylene glycol monomethyl ether with a molecular weight of 1200, 0.2g each of hydroquinone and phenothiazine, 103g of methacrylic acid, and 2.56g of concentrated sulfuric acid into a reaction vessel, stir evenly, and keep The temperature was 125°C, and the reaction was carried out for 5 hours to obtain a mixture of polyethylene glycol monomethyl ether methacrylate and methacrylic acid. After cooling down to 40°C, 360g of water was added to form a solution, and then 5.6g of 30wt% sodium hydroxide solution was added to obtain a mixed solution with a pH of 2-3.

[0039] B. Add 500g of bottom water to the reaction vessel, raise the temperature to 95°C to prepare for reaction, add 370g of the mixed solution of step A and 84g of 4.8wt% ammonium persulfate solution dropwise at the same time, control the rate of addition, and finish ...

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Abstract

The invention discloses a preparation method of a modified high-performance polycarboxylic acid water reducing agent, which comprises the following steps of: A. esterification reaction: reacting polyethylene glycol monomethyl ether with methyl acrylic acid at a certain temperature to obtain a mixture of the polyethylene glycol monomethyl ether and the methyl acrylic acid, with concentrated sulfuric acid as a catalyst and hroquinone and thiophenylamine as polymerization inhibitors; reducing temperature; adding water; and adjusting the pH value of the mixed solution with sodium hydroxide solution; B. copolymerization: adding a certain amount of bottom water as a solvent and taking ammonium persulfate solution as an initiator, copolymerizing the mixed solution obtained in the step A with sodium gluconate and sodium nitrite at a certain temperature; and C. cooling, neutralizing with the sodium hydroxide solution and adjusting the pH value to obtain the water reducing agent. The method disclosed by the invention is simple and feasible, is simple and convenient for operation and can be applied to subway tunnel plants, precast beam plants and the like; and according to the method, the water-reducing rate of the water reducing agent is improved, the congealed time of the concrete is shortened and the early strength of the concrete is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of new fine chemical materials, in particular to a preparation method of a modified polycarboxylic acid high-performance water reducer. The water reducing agent prepared by this method is suitable for concrete that requires high early strength. Background technique [0002] At present, two types of water reducers are mainly used in China, one is naphthalene-based water reducer; the other is polycarboxylic acid-based water reducer. [0003] Naphthalene-based superplasticizers have the characteristics of mature production technology, no air-entrainment, no retardation, and good cement adaptability, but the slump loss is large, and it is difficult to meet the construction requirements of actual projects. Generally, it needs to be used in combination. Most of the products are prepared by using formaldehyde and concentrated sulfuric acid, and the environmental pollution in the preparation process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08G65/48C04B24/26C04B103/30
Inventor 雷斌
Owner WUHAN AOWEIBANG TECH DEV