Preparation method of environmental protection type water reducer for improving cement concrete performance
A cement concrete, environment-friendly technology, applied in the field of preparation of environment-friendly water reducing agent, can solve the problems of large loss over time, unfavorable development, environmental pollution and the like
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Embodiment 1
[0023] Add 60 g of polyethylene glycol with a molecular weight of 400, 50 g of water, and 0.5 g of concentrated sulfuric acid into a four-neck flask, stir and raise the temperature, and drop 23.2 g of 50% maleic acid solution at 70 ° C, drop it in 40 minutes, and control the temperature Stir and reflux at 87°C for 1 hour; then add 11.52g of sodium methacrylate and 52g of water; weigh 0.324g of ammonium persulfate to make a 20% solution, add 21.6g of acrylic acid, and drop the mixture into In the above solution, control the dropping rate for 1.5 hours, continue the reaction for 2.5 hours, cool to room temperature after the reaction, adjust the pH to 7 with concentrated ammonia water, and obtain the water reducer for cement concrete of the present invention.
Embodiment 2
[0025] Add 120g of polyethylene glycol with a molecular weight of 800, 80g of water, and 0.91g of concentrated sulfuric acid into a four-neck flask, stir and raise the temperature, add 10g of acrylic acid dropwise at 70°C, drop it in 30 minutes, and control the temperature at 87°C and stir and reflux for 1 hour Then add 11.52g of sodium methylpropene sulfonate, add 82g of water; then weigh 0.3375g of ammonium persulfate to make a 20% solution, then add 45g of 50% maleic acid, and drop the mixture of the two into the above solution, Control the dropping speed for 1.5 hours, continue to react for 3 hours, cool to room temperature after the reaction, and adjust the pH to 7 with concentrated ammonia water to obtain the water reducer for cement concrete of the present invention.
Embodiment 3
[0027] Add 150g of polyethylene glycol with a molecular weight of 2000, 100g of water, and 1.1g of concentrated sulfuric acid into a four-neck flask, stir and raise the temperature, drop in 7g of methacrylic acid at 70°C, drop it in 30 minutes, and control the temperature at 87°C to stir and reflux 1 hour; then add 5.76g of sodium methacrylate, and add 70g of water; then weigh 0.189g of ammonium persulfate to make a 20% solution, then add 12.6g of acrylic acid, drop the mixture of the two into the above solution, and control After the dripping speed is 1 hour, the reaction is continued for 2.5 hours. After the reaction is completed, it is cooled to room temperature, and the pH is adjusted to 7 with concentrated ammonia water to obtain the water reducer for cement concrete of the present invention.
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