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Polyester-base carboxylic acid water reducer and its preparation method

A technology of polyester-based carboxylic acid and water reducing agent, which is applied in the field of concrete admixture and its preparation, and can solve the problems of difficult control of the reaction process, high price, and high reaction temperature

Inactive Publication Date: 2012-10-17
马清浩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction process of the method provided by this patent is difficult to control, and the water reducing rate and slump retention value are still not very ideal.
[0007] In addition, CN101955333A and CN102268121A also disclose a kind of polycarboxylate water reducer, but the former uses expensive sulfonate, and the latter uses acrylamidomethacrylic acid, and the reaction temperature is relatively low. High, the reaction process is difficult to control and requires vacuum or nitrogen protection

Method used

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  • Polyester-base carboxylic acid water reducer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 1800Kg of macromonomer methallyl alcohol polyoxyethylene ether (molecular weight is 1800-2500) into 2100Kg of water as still bottom material. The ammonium persulfate of 1.5Kg is dissolved in 680Kg water as material I. Dissolve 9Kg of mercaptopropionic acid and 270Kg of acrylic acid in 450Kg of water as material II.

[0029] Add material I and material II to the bottom material of the kettle, wherein the material I is added in 3 and a half hours, and the material II is added in 3 hours. The temperature during the feeding process is controlled at 60°C. hour, lower the temperature to below 50°C, and add 120Kg of 30% aqueous sodium hydroxide solution. That is, the desired water reducer was obtained with a yield of 94%. The slump retention value and water reducing rate value of the obtained product are shown in Table 1.

Embodiment 2

[0031] Other steps are the same as in Example 1, except that 270 Kg of acrylic acid in Example 1 is replaced with 250 Kg of acrylic acid. The yield was 92%. The slump retention value and water reducing rate value of the obtained product are shown in Table 1.

Embodiment 3

[0033] Other steps are the same as in Example 1, except that 10Kg of isopropanol is used to replace 10Kg of mercaptopropionic acid in Example 1. The yield was 90%. The slump retention value and water reducing rate value of the obtained product are shown in Table 1.

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Abstract

The invention provides a polyester-base carboxylic acid water reducer and its preparation method. Raw materials for preparing the water reducer comprise: allyl alcohol polyethenoxy ether or methyl allyl alcohol polyethenoxy ether, acrylic acid, a chain transferring agent, a catalyst, antalkali and water. The water reducer has advantages of environmental protection, small slump loss and high water-reducing rate. In addition, a preparation technology of the water reducer is simple and requires low cost.

Description

technical field [0001] The invention relates to an admixture for concrete and a preparation method thereof, in particular to a polyester-based carboxylic acid water reducer and a preparation method thereof. Background technique [0002] Water reducers are also called dispersants or plasticizers, and they get their name because they can reduce the water consumption of freshly mixed concrete when used. In the field of modern concrete technology, water reducing agent is one of the admixtures to improve the rheological properties of concrete, and has been regarded as the fifth component of concrete besides cement, sand, stone and water. [0003] The common water reducing agents mainly include lignin cyclic salt series, naphthalene series, melamine series, sulfamate series and polycarboxylic acid series. From the 1930s to the 1960s was the application and development period of common water reducers. The water reducers used in the early days were mainly organic compounds such as ...

Claims

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Application Information

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IPC IPC(8): C04B24/28C08F290/06C08F220/06C08F2/38C04B103/30
Inventor 马清浩
Owner 马清浩