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
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[0027] Example 1
[0028] 120g AE-1, 120g deionized water, 3.0g 27.5% hydrogen peroxide were added into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dripping device, and stirred and heated to 50°C. At the same time, drip and mix 14.7g of maleic anhydride, 7.1g of hydroxypropyl methacrylate, 50.0g of deionized water and 20g of 10% sodium formaldehyde sulfoxylate solution. The dripping time is controlled at about 90 minutes. , The reaction temperature is controlled at 48~52℃. After the dripping is completed, keep the temperature at 48-52°C for about 30 minutes to complete the polymerization reaction. After the temperature is finished, 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.
Example Embodiment
[0029] Example 2
[0030] 120g AE-2, 120g deionized water, 2.0g 27.5% hydrogen peroxide were added into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dripping device, and stirred and heated to 50°C. At the same time, add dropwise a monomer aqueous solution mixed with 9.8g maleic anhydride, 50.0g deionized water, 4.4g methyl acrylate and 15g 10% sodium formaldehyde sulfoxylate aqueous solution, the dropping time is controlled at about 90 minutes, the reaction temperature Control at 48~52℃. After the dripping is completed, keep the temperature at 48-52°C for about 30 minutes to complete the polymerization reaction. After the heat preservation is completed, 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 .
Example Embodiment
[0031] Example 3
[0032] 120g AE-3, 120g deionized water, 3.0g 27.5% hydrogen peroxide were added into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dripping device, and stirred and heated to 50°C. At the same time, drip and mix 14.7g maleic anhydride, 7.1g acrylamide, 50.0g deionized water monomer aqueous solution, 4.4g methyl acrylate and 20g 10% sodium formaldehyde sulfoxylate solution, the dripping time is controlled at 90 In about minutes, the reaction temperature is controlled at 48-52°C. After the dripping is completed, keep the temperature at 48-52°C for about 30 minutes to complete the polymerization reaction. After the temperature is finished, 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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