Slump retaining polyocarboxy acid superplasticiser
A technology of superplasticizer and type polycarboxylate, which is applied in the field of concrete admixture, can solve the problem of low water-reducing rate of polycarboxylate superplasticizer and achieve high slump
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[0037] Example 1
[0038] Add 45.0g of A-1, 7.5g of itaconic acid, and 100.0g of deionized water into a 500ml four-necked flask equipped with a stirrer, thermometer, and dripping device, stir and raise the temperature to 80℃, while adding 22.5g10% dropwise An aqueous solution of ammonium persulfate and a monomer aqueous solution composed of 90.0g of B-1, 7.5g of methacrylic acid, 0.80g of 2-mercaptopropionic acid and 45.0g of water, the dropping time is controlled at 120 minutes and 90 minutes, respectively. The temperature is controlled at 78~82℃. After the dropwise addition, the temperature is kept at 78-82°C for about 60 minutes to complete the polymerization reaction. After the heat preservation, the temperature is lowered to below 50° C. and 27.0 g of 30% NaOH is added to obtain the polycarboxylic acid superplasticizer PC-1 of the present invention, with a solid content of 45.4% and a weight average molecular weight of 22500.
Example Embodiment
[0039] Example 2
[0040] Add 82.5g of A-3, 9.0g of itaconic acid, and 120.0g of deionized water into a 500ml four-necked flask equipped with a stirrer, thermometer, and dripping device, stir and raise the temperature to 90℃; at the same time add 22.5g10% dropwise An aqueous solution of sodium persulfate and a monomer aqueous solution composed of 48.0g of B-4, 10.5g of acrylic acid, 0.60g of 3-mercaptopropionic acid and 65.0g of water. The dripping time is controlled at 120 minutes and 90 minutes, respectively, and the reaction temperature is controlled. At 88~92℃. After the dripping is completed, the temperature is kept at 88-92°C for about 60 minutes to complete the polymerization reaction. After the heat preservation, the temperature is lowered to below 50° C. and 37.9 g of 30% NaOH is added to obtain the polycarboxylic acid superplasticizer PC-2 of the present invention, which has a solid content of 40.0% and a weight average molecular weight of 25,000.
Example Embodiment
[0041] Example 3
[0042]Add 67.5g of A-4, 3.0g itaconic acid, 120.0g of deionized water into a 500ml four-necked flask equipped with a stirrer, thermometer and dripping device, stir and heat to 70℃; meanwhile add 22.5g10% dropwise Potassium persulfate aqueous solution and monomer aqueous solution composed of 67.5g of B-2, 12.0g of methacrylic acid, 1.20g of thioglycolic acid and 70.0g of water. The dropping time is controlled at 120 minutes and 90 minutes, respectively, and the reaction temperature is controlled at 68 ~72℃. After the dropwise addition, the temperature is kept at 68-72°C for about 60 minutes to complete the polymerization reaction. After the heat preservation, the temperature is lowered to 50° C. and 24.8 g of 30% NaOH is added to obtain the polycarboxylic acid superplasticizer PC-3 of the present invention, with a solid content of 40.4% and a weight average molecular weight of 16,500.
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