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A kind of high-performance polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducer, applied in the field of concrete, can solve the problems of comprehensive performance impact of concrete, difficulty in guaranteeing engineering quality, poor slump retention and adaptability, etc., to achieve improved slump retention ability, low cost, and slump retention ability Enhanced effect

Active Publication Date: 2016-09-14
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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  • A kind of high-performance polycarboxylate water reducer and preparation method thereof
  • A kind of high-performance polycarboxylate water reducer and preparation method thereof
  • A kind of high-performance polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In a 2000mL four-necked flask equipped with an electric stirring device, a constant temperature heating device, and a peristaltic pump, add 25.0mol of water, 0.202mol of the macromonomer isopentenyl polyoxyethylene ether, and the molecular weight of the used isopentenyl polyoxyethylene ether For 1000-3000, stir and heat up to 60°C to dissolve uniformly. The mixed solution consisting of 0.685 mol acrylic acid, 0.066 mol acryloxyethyl phosphate, 0.012 mol thioglycolic acid, and 3.333 mol water and the mixed solution consisting of 0.035 mol ammonium persulfate and 6.667 mol water were added dropwise within 3 hours at a uniform rate. , The temperature is controlled between 60-65℃; after the addition is complete, continue to react for 2 hours, then cool to 35-40℃, add a mass fraction of 32% sodium hydroxide solution and a small amount of diluted water to obtain a pH of 6 8. PC-P1, a high-performance polycarboxylate water-reducing agent with a phosphate structure with a solid ...

Embodiment 2

[0031] In a 2000mL four-necked flask equipped with an electric stirring device, a constant temperature heating device, and a peristaltic pump, add 27.28mol of water, 0.15mol of the macromonomer methallyl polyoxyethylene ether, and the methallyl polyoxyethylene used The molecular weight of the ether is 1000-3000. Stir and raise the temperature to 40°C. After dissolving evenly, add 0.045mol hydrogen peroxide directly, and add 0.7mol methacrylic acid, 0.07mol methacryloxyethyl phosphate, 3. A mixed solution composed of 3.333 mol of water and a mixed solution composed of 0.03 mol of mercaptopropionic acid, 0.005 mol of ascorbic acid, and 6.667 mol of water. The temperature is controlled between 40-45 ℃; after the dropwise addition is completed, continue the reaction for 2 hours, and then cool to 35-40℃, add 32% ammonia water and a small amount of dilution water to obtain a high-performance polycarboxylate water-reducer PC-P2 with a phosphate structure with a pH of 6-8 and a solid co...

Embodiment 3

[0033] Add 27.28mol of water and 0.25mol of macromonomer allyl polyoxyethylene ether into a 2000mL four-necked 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℃, add 0.5mol maleic anhydride, stir to dissolve evenly, add 0.01mol ammonium persulfate dissolved in 3.333mol water directly, and add 0.015mol acrylic acid and 0.08mol at a constant rate within 3.0 hours A mixed solution composed of acryloxypropyl phosphate, 0.01 mol thioglycolic acid, and 6.667 mol water. The temperature is controlled between 75-80°C; after the addition is complete, continue the reaction for 2 hours, then cool to 35-40°C and add The mass fraction of ethylenediamine is 32% and a small amount of dilution water is used to obtain a high-performance polycarboxylate water-reducing agent PC-P3 with a phosphate structure with a pH of 6-8 and a solid content of abou...

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Abstract

The invention discloses a high-performance polycarboxylate water reducer, the polycarboxylate water reducer has a general structural formula (I), and the invention also provides a preparation method of a high performance polycarboxylate water reducer, In addition to polyether macromonomers and unsaturated carboxylic acid monomers, unsaturated phosphate ester monomers are added to obtain a high-performance polycarboxylate water reducer with a phosphate ester structure. The polycarboxylate water reducer disclosed by the invention has a safe and simple preparation process, is environmentally friendly, has low energy consumption and low cost, and is suitable for industrial scale production. Among them, R 1 is ‑H, ‑COO‑ or ‑CH 2 COO‑;R 2 is ‑H or ‑CH 3 ; 3 is ‑H or ‑CH 3 ; 4 is ‑H or ‑CH 3 ; 5 is ‑H or ‑CH 3 ; 6 for-CH 2 ‑or‑CH 2 CH 2 -; X, Y, Z and n are all integers, X=1-100, Y=1-100, Z=1-100, n=22-53.

Description

Technical field [0001] The invention relates to the technical field of concrete, in particular to a high-performance polycarboxylic acid water reducer and a preparation method thereof. Background technique [0002] High performance concrete is widely used in the construction of major bridges, highways, tunnels and large buildings due to its high workability, high strength, high durability and volume stability. Among them, water reducer is indispensable for high performance concrete. One of the components. Polycarboxylic acid water reducing agent has the advantages of low dosage, high water reduction rate, good slump retention, greater freedom in molecular structure design, and environmental friendliness. It is known as the third-generation concrete superplasticizer and has become a concrete additive The focus of research and development in the field of chemical agents. [0003] At present, there are two major categories of polycarboxylic acid water-reducing agent products at home...

Claims

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Application Information

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Patent Type & Authority Patents(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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