Superplasticizer and preparation method thereof
A technology of superplasticizer and initiator, applied in the field of superplasticizer and its preparation, can solve the problems of high production cost, high cost of raw materials, shortage of resources, etc., achieve low cost of raw materials, reduce loss over time, and improve cement production. The effect of water reduction rate of mortar
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Embodiment 1
[0024] Add 4.0g of dehydrated castor oil, 10.0g of allyl polyoxyethylene ether, and 0.028g of mercaptoacetic acid into a four-neck flask, add 14.0g of deionized water, and start Add the initiator dropwise, and add 4.2g dropwise in about 3 hours. The initiator is mixed with 2.1g hydrogen peroxide and 2.1g ascorbic acid. After the dropwise addition, keep stirring at 20°C for 1 hour, then stop heating and stirring, In the four-necked flask, dripping mass concentration is 10% sodium hydroxide aqueous solution, stops dripping when mixed solution pH value is 7.0, makes castor oil base superplasticizer, and its infrared spectrogram is as follows figure 1 Shown, product yield is 83.6%.
Embodiment 2
[0026] Add 25.0g of dehydrated castor oil, 10.0g of allyl polyoxyethylene ether, and 0.35g of mercaptoacetic acid into a four-necked flask, add 52.5g of deionized water, and start Add the initiator dropwise, and add 28.0g dropwise in about 5 hours. The initiator is mixed with 21.0g hydrogen peroxide and 7.0g ascorbic acid. After the dropwise addition, keep stirring at 40°C for 2 hours, then stop heating and stirring, In the four-necked flask, the sodium hydroxide aqueous solution with a mass concentration of 20% was added dropwise, and the dropwise addition was stopped when the pH value of the mixed solution was 7.0 to obtain a castor oil-based superplasticizer with a product yield of 88.3%.
Embodiment 3
[0028] Add 10.0g of dehydrated castor oil, 10.0g of methallyl polyoxyethylene ether, and 0.1g of mercaptoacetic acid into a four-neck flask, add 25.0g of deionized water, at a temperature of 60°C and a stirring rate of 120 rpm , start dropping the initiator, and drop 15.6g in about 5 hours. The initiator is mixed with 10.4g hydrogen peroxide and 5.2g ascorbic acid. After the drop is completed, keep stirring at 60°C for 1 hour, then stop heating and stirring , in the four-neck flask, dripping mass concentration is 10% sodium hydroxide aqueous solution, stops dripping when pH value of mixed solution is 7.0, makes castor oil base superplasticizer, and product yield is 87.8%.
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