Super-plasticizer for ultrahigh-performance concrete and preparation method of super-plasticizer
A superplasticizer and ultra-high-performance technology, applied in the field of concrete superplasticizers, can solve the problems of poor dispersion ability of water reducer, low water reducing rate, insufficient viscosity reduction effect, etc.
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Embodiment 1
[0129] (1) Add acetonitrile (206.58 parts) in the reactor, then add 14.35 parts of phosphorous acid, 0.99 parts of hypophosphorous acid (50% aqueous solution, containing 0.99 parts of water), 0.88 parts of sodium hypophosphite, 4.9 parts of anhydrous phosphoric acid and 6 parts of sodium dihydrogen phosphate, adjust the reactor to 70°C, stir evenly, and add 7.112 parts of B1 and D1 (17.14 parts of aqueous solution, 35wt%) into the reactor continuously and uniformly, and the feeding time is 6 hours. After reacting for 6 hours, adjust the temperature of the reactor to 0°C, continuously and uniformly add 11.414 parts of E1 to the reactor within 2 hours, continue to stir for 22 hours to stop the reaction, and remove the solvent and small volatile organic molecules in vacuo to obtain an intermediate mixture.
[0130] (2) Add water (22.06 parts), polyether G1 (125 parts) and the intermediate mixture prepared in step (1) to the flask, adjust the temperature of the reactor to 80°C, sti...
Embodiment 2
[0132] (1) Add water (11.08 parts) to the reactor, then add 26.4 parts of hypophosphorous acid and 1.96 parts of anhydrous phosphoric acid to it, adjust the reactor to 100°C, stir evenly, and add continuously and evenly into the reactor 16.93 parts of B2 and 28.84 parts of D2, the feeding time is 1 hour, continue to react for 5 hours after feeding, adjust the temperature of the reactor to 60°C, add 25.626 parts of E2 to the reactor at one time, continue to stir for 8 hours to stop the reaction, remove the solvent in vacuo and volatile organic small molecules to obtain an intermediate mixture.
[0133] (2) Add water (105.05 parts), polyether G2 (240 parts) and the intermediate mixture prepared in step (1) to the flask, adjust the temperature of the reactor to 50°C, stir and mix well, and evenly add acrylic acid dropwise to it (7.2 parts), the mixed aqueous solution (105.05 parts of water) of initiator azobisisobutylamidine hydrochloride (11.59 parts), feed intake all continues ...
Embodiment 3
[0135] (1) Add water (2382.684 parts) in the reactor, then add 52.8 parts of sodium hypophosphite, phosphorus pentoxide (21.6 parts) (7.8 parts of water in this reaction composition C are contained in the solvent, not Listed separately) and 14.2 parts of disodium hydrogen phosphate, adjust the reactor to 120°C, stir evenly, and add 9.356 parts of B3 and 44.4 parts of D3 into the reactor continuously and evenly, and the feeding time is 0.5h. After reacting for 5.5 hours, adjust the temperature of the reactor to 80°C, continuously and uniformly add 113.72 parts of E3 into the reactor within 4 hours, continue stirring for 4 hours to stop the reaction, and remove the solvent and small volatile organic molecules in vacuo to obtain an intermediate mixture.
[0136] (2) Add water (207.675 parts), polyether G3 (400 parts) and the intermediate mixture prepared in step (1) to the flask, adjust the temperature of the reactor to 60°C, stir and mix evenly, and drop Add mercaptopropionic ac...
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