Preparation method for linear polycarboxylate type water reducing agent special for semi-hydrated gypsum
A technology of linear polycarboxylic acid and hemihydrate gypsum, which is applied in the field of building materials science, can solve the problems of inaccurate representation of molecular structure, poor adaptability, and large loss of fluidity of freshly mixed gypsum slurry over time, achieving excellent Water reduction and retarding effect, obvious dispersion effect and controllable setting time
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[0050] Example 1
[0051] To a 100 mL four-necked round bottom flask equipped with a thermometer, stirrer and bulb condenser was added 3.5 g of the chain transfer agent sodium methacrylate sulfonate and 10 g of deionized water. The temperature was raised to 60°C with stirring. After the sodium methacrylate was dissolved, the solution consisting of 9g acrylic acid, 3g vinyl acetate and 10g water and the solution consisting of 0.3g ammonium persulfate and 5g water were dripped within 1h with a peristaltic pump. Add to a four-neck bottle. After the dropwise addition, the reaction was stirred for 4h. After the reaction was completed, the temperature was lowered to below 40° C., and 30% sodium hydroxide was added to neutralize to pH 7 to obtain a pale yellow liquid. That is, the special linear polycarboxylate superplasticizer PC-1 for hemihydrate gypsum of the present invention.
Example Embodiment
[0052] Example 2
[0053] To a 100 mL four-necked round-bottomed flask equipped with a thermometer, stirrer and bulb condenser was added 4 g of the chain transfer agent sodium bisulfite and 10 g of deionized water. The temperature was raised to 70 °C with stirring. After the sodium bisulfite was dissolved, the solution consisting of 8 g of acrylic acid, 2 g of sodium p-styrene sulfonate and 10 g of water, and the solution of 0.8 g of potassium persulfate and 10 g of water were respectively mixed with a peristaltic pump for 0.5 h. Add dropwise to a four-necked bottle. After the dropwise addition, the reaction was stirred for 4h. After the reaction was completed, the temperature was lowered to below 40° C., and 30% sodium hydroxide was added to neutralize to pH 6 to obtain a brownish-yellow liquid. That is, the special linear polycarboxylate superplasticizer PC-2 for hemihydrate gypsum of the present invention.
Example Embodiment
[0054] Example 3
[0055] To a 100 mL four-necked round bottom flask equipped with a thermometer, stirrer and bulb condenser was added 2.1 g of the chain transfer agent sodium bisulfite and 10 g of deionized water. The temperature was raised to 70°C with stirring. After the sodium bisulfite was dissolved, a solution consisting of 10g acrylic acid, 4g sodium p-styrene phosphate, 1g hydroxyethyl acrylate and 10g water, 0.5g ammonium persulfate and 5g water were respectively formed by a peristaltic pump. The solution was added dropwise to the four-necked bottle within 0.5h. After the dropwise addition, the reaction was stirred for 3h. After the reaction was completed, the temperature was lowered to below 40° C., and 30% sodium hydroxide was added to neutralize to pH 6 to obtain a light brown liquid. That is, the special linear polycarboxylate superplasticizer PC-3 for hemihydrate gypsum of the present invention.
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