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Polycarboxylic acid cement dispersant and its prepn process

A technology of cement dispersant and polycarboxylate, which is applied in the field of polycarboxylate cement dispersant and its preparation, can solve the problems of insufficient water-reducing performance of water-reducing agents, and achieve excellent slump retention, low energy consumption, high water-reducing The effect of water rate

Inactive Publication Date: 2006-10-18
SHANGHAI SUNRISE CHEMISTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-reducing performance of the water-reducing agent prepared by this method is insufficient, and a good dispersion ability can only be obtained at a relatively high solid content.

Method used

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  • Polycarboxylic acid cement dispersant and its prepn process
  • Polycarboxylic acid cement dispersant and its prepn process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 120g of AE-1, 120g of deionized water, and 3.0g of 27.5% hydrogen peroxide into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 50°C. Simultaneously drop and mix the monomer aqueous solution of 14.7g maleic anhydride, 7.1g hydroxypropyl methacrylate, 50.0g deionized water and 20g 10% sodium formaldehyde sulfoxylate solution, and the dropping time is controlled at about 90 minutes , the reaction temperature is controlled at 48-52°C. After the dropwise addition, keep the temperature at 48-52° C. for about 30 minutes to make the polymerization complete. After the heat preservation is over, add 36 g of 30% NaOH to neutralize the pH to about 6.5 to obtain the polycarboxylate cement dispersant PC-1 of the present invention.

Embodiment 2

[0030] Add 120g of AE-2, 120g of deionized water, and 2.0g of 27.5% hydrogen peroxide into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 50°C. Add dropwise the monomer aqueous solution that has mixed 9.8g maleic anhydride, 50.0g deionized water and 4.4g methyl acrylate and 15g 10% sodium formaldehyde sulfoxylate aqueous solution, the time of dropping is controlled at about 90 minutes, and reaction temperature Control at 48-52°C. After the dropwise addition, keep the temperature at 48-52°C for about 30 minutes to complete the polymerization reaction. After the heat preservation is over, add 27.0g of 30% NaOH to neutralize the pH to about 6.5 to obtain the polycarboxylate cement dispersant PC-2 of the present invention. .

Embodiment 3

[0032] Add 120g of AE-3, 120g of deionized water, and 3.0g of 27.5% hydrogen peroxide into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 50°C. Simultaneously drop and mix the monomer aqueous solution of 14.7g maleic anhydride, 7.1g acrylamide, 50.0g deionized water and 4.4g methyl acrylate and 20g 10% sodium formaldehyde sulfoxylate solution, the time of dropping is controlled at 90 Minutes or so, the reaction temperature is controlled at 48-52°C. After the dropwise addition, keep the temperature at 48-52° C. for about 30 minutes to make the polymerization complete. After the heat preservation is over, add 36 g of 30% NaOH to neutralize the pH to about 6.5 to obtain the polycarboxylate cement dispersant PC-3 of the present invention.

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Abstract

The present invention discloses polycarboxylicacid cement dispersant and its preparation process. The cement dispersant is prepared with unsaturated polyoxyethylene ether monomer, unsaturated binary carboxylic acid monomer and other monomer capable of copolymerizing with the said monomers, and through copolymerization in redox system. The cement dispersant of the present invention has high water reducing rate, low slump loss and other advantages, and the preparation process has low power consumption, high efficiency, high repeatability and other advantages and is suitable for producing polycarboxylicacid cement dispersant.

Description

technical field [0001] The invention relates to a water reducing agent and a preparation method thereof, in particular to a polycarboxylate cement dispersant and a preparation method thereof. Background technique [0002] The development of cement dispersant (also known as water reducer) has a long history. In 1935, E.W. Scripcher of the United States first developed a plasticizer with lignosulfonate as the main component, which was widely used in C20-C40 concrete, promoting the development of concrete to medium strength; in 1962, Japan successfully developed naphthalene sulfonate Acid-formaldehyde condensate high-efficiency water-reducer, this type of water-reducer has the advantages of low production cost and good water-reducing effect, so it is widely used in C30-C60 concrete, promoting the development of concrete to high strength. However, the slump loss of the concrete prepared by using the water reducing agent is fast, which cannot meet the construction requirements s...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/04
Inventor 郑柏存傅乐峰冯中军
Owner SHANGHAI SUNRISE CHEMISTRY CO LTD
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