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High-performance polycarboxylate water reducing agent and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete, can solve the problems of concrete comprehensive performance impact, poor slump retention and adaptability, difficulty in guaranteeing engineering quality, etc. low effect

Active Publication Date: 2015-01-07
CCCC SHEC WUHAN PORT NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned research has solved the problem that the slump retention and adaptability of ether-based polycarboxylic acids are relatively poor compared with ethers, it has weakened the advantages of ethers themselves with low dosage and high water-reducing rate to a certain extent, making The increase of its dosage will affect the comprehensive performance of concrete, and it is difficult to guarantee the quality of the project

Method used

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  • High-performance polycarboxylate water reducing agent and preparation method thereof
  • High-performance polycarboxylate water reducing agent and preparation method thereof
  • High-performance polycarboxylate water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 25.0mol of water and 0.202mol of macromonomer isopentenyl polyoxyethylene ether into a 2000mL four-neck flask equipped with electric stirring device, constant temperature heating device and peristaltic pump. The molecular weight of isopentenyl polyoxyethylene ether used is 1000-3000, stir and heat up to 60°C, dissolve evenly. Add a mixed solution consisting of 0.685mol acrylic acid, 0.066mol acryloyloxyethyl phosphate, 0.012mol thioglycolic acid, 3.333mol water and a mixed solution composed of 0.035mol ammonium persulfate and 6.667mol water respectively within 3 hours. , the temperature is controlled between 60-65°C; after the dropwise addition is completed, continue to react for 2 hours, then cool down to 35-40°C, add a mass fraction of 32% sodium hydroxide solution and a small amount of dilution water to obtain a pH value of 6- 8. The high-performance polycarboxylate superplasticizer PC-P1 with a phosphate ester structure with a solid content of about 40% has a mo...

Embodiment 2

[0031] Add 27.28mol of water and 0.15mol of macromonomer methallyl polyoxyethylene ether into a 2000mL four-neck flask equipped with an electric stirring device, a constant temperature heating device, and a peristaltic pump. The molecular weight of the ether is 1000-3000. Stir and heat up to 40°C. After dissolving evenly, add 0.045mol of hydrogen peroxide directly, and add 0.7mol of methacrylic acid, 0.07mol of methacryloyloxyethyl phosphate, and The mixed solution composed of 3.333mol water and the mixed solution composed of 0.03mol mercaptopropionic acid, 0.005mol ascorbic acid, and 6.667mol water are controlled at a temperature between 40-45°C; after the dropwise addition, continue to react for 2 hours, and then cool down to 35-40°C, add ammonia water with a mass fraction of 32% and a small amount of dilution water to obtain a high-performance polycarboxylate water reducer PC-P2 with a phosphate structure and a solid content of about 40% at a pH of 6-8. Its molecular weight...

Embodiment 3

[0033]Add 27.28mol of water and 0.25mol of macromonomer allyl polyoxyethylene ether into a 2000mL four-neck flask equipped with electric stirring device, constant temperature heating device and peristaltic pump. The molecular weight of allyl polyoxyethylene ether used is 1000 -3000, stir and heat up to 60°C, add 0.5mol maleic anhydride, stir to dissolve evenly, then directly add a solution of 0.01mol ammonium persulfate dissolved in 3.333mol water, and dropwise add 0.015mol acrylic acid, 0.08mol A mixed solution composed of acryloxypropyl phosphate, 0.01mol mercaptoacetic acid, and 6.667mol water, the temperature is controlled between 75-80°C; after the dropwise addition, continue to react for 2 hours, then cool down to 35-40°C, add The mass fraction is 32% ethylenediamine and a small amount of dilution water to obtain a high-performance polycarboxylate water reducer PC-P3 with a phosphate structure and a molecular weight of 60,000 with a pH value of 6-8 and a solid content of ...

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Abstract

The invention discloses a high-performance polycarboxylate water reducing agent. The polycarboxylate water reducing agent has a structural general formula shown as a structural formula (I). The invention further provides a preparation method of the high-performance polycarboxylate water reducing agent. Apart from a polyether macromonomer and an unsaturated carboxylic acid monomer, an unsaturated phosphate monomer is added to obtain a product, namely, the high-performance polycarboxylate water reducing agent having a phosphate structure. The polycarboxylate water reducing agent disclosed by the invention is safe and simple in preparation process, environmentally friendly, low in energy consumption, low in cost, and suitable for industrial large-scale production. In the structural formula (I), R1 is -H, -COO- or -CH2COO-; R2 is -H or -CH3; R3 is -H or -CH3; R4 is -H or -CH3; R5 is -H or -CH3; R6 is -CH2- or -CH2CH2-; X, Y, Z and n are integers; X=1-100; Y=1-100; Z=1-100; and n=22-53.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a high-performance polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Due to the characteristics of high workability, high strength, high durability and volume stability, high-performance concrete is widely used in the construction of major bridges, highways, tunnels and large buildings. Among them, water reducing agent is an indispensable component of high-performance concrete one of the components. Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, good slump retention, large degree of freedom in molecular structure design, and environmental friendliness. Research hotspots and development priorities in the pharmaceutical field. [0003] At present, there are two major types of polycarboxylate superplasticizer products at home and abroad, ethers and esters. The production process of esters is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B24/32C08F283/06C08F230/02C08F220/06C08F222/02
Inventor 张鸿李顺凯屠柳青高玉军王文荣石韧
Owner CCCC SHEC WUHAN PORT NEW MATERIALS
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