Polyfunctional superplasticizer for ultra-high performance concrete and preparation method of polyfunctional superplasticizer
A technology of multi-functional group and superplasticizer, applied in the field of concrete superplasticizer, can solve the problems of insufficient viscosity reduction effect, low water reducing rate, poor dispersing ability of water reducing agent, etc.
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Embodiment 1
[0116] (1) Add dimethyl sulfoxide (82.48 parts) to the reactor, sequentially add B1 (7.112 parts), C1 (22.52 parts) and concentrated sulfuric acid (20 parts, 98%), and adjust the reactor to 70°C , after stirring evenly for 1 hour, the reactor was adjusted to 120°C, and phosphorous acid (20.5 parts), polyphosphoric acid (85%P 2 o 5 Equivalent, 51.95 parts), continue to stir the reaction for 12h, stop the reaction, and remove the solvent in vacuo to obtain the intermediate mixture.
[0117] (2) Add water (60 parts), polyether G1 (400 parts) and the intermediate mixture prepared in step (1) to the flask, adjust the temperature of the reactor to 70°C, stir and mix evenly, and add azo 0.462 parts of diisobutyronitrile powder, and then evenly added dropwise an aqueous solution (67.98 parts of water) of methacrylic acid (4.3 parts) and sodium acrylate (4.7 parts) to it, and added dropwise for 4 hours. Add 0.462 parts of azobisisobutyronitrile powder to it at one time, a total of 8 ...
Embodiment 2
[0119] (1) Add water (11.03 parts) to the reactor, add B2 (16.93 parts), C2 (30.03 parts) and concentrated sulfuric acid (5 parts, 98%) to it in turn, adjust the reactor to 100 ° C, stir well After reacting for 6h, the reactor was adjusted to 60°C, and phosphorous acid (16.4 parts), P 2 o 5 (47.33 parts) and 32.67 parts of anhydrous phosphoric acid, continue to stir the reaction for 10h, stop the reaction, and remove the solvent in vacuo to obtain an intermediate mixture.
[0120] (2) Add water (122.72 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 evenly, and dropwise evenly drop the initiator Aqueous solution of azobisisobutylamidine hydrochloride (10.27 parts dissolved in 122.72 parts of water), added dropwise for 6 hours, continued to react for 12 hours after dropping, adjusted the temperature to room temperature, and stopped the reaction to obtain superplasticize...
Embodiment 3
[0122] (1) Add N,N-dimethylformamide (84.02 parts) to the reactor, add B3 (9.356 parts), C3 (57.05 parts) and trifluoroacetic acid (11.402 parts) to it successively, adjust the reactor to 100°C, stirred evenly and reacted for 6 hours, adjusted the reactor to 80°C, added phosphorous acid (8.2 parts), potassium hypophosphite (10.4 parts), phosphorus pentoxide (12.62 parts) and water (1.6 parts) to it , continue to stir the reaction for 12h, stop the reaction, and remove the solvent in vacuo to obtain an intermediate mixture.
[0123] (2) Add water (185.66 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 a mixture of acrylic acid (57.6 parts) and mercaptopropionic acid (1.06 parts), an aqueous solution of the initiator (2.28 parts of ammonium persulfate dissolved in 92.83 parts of water, 4.16 parts of sodium bisulfite dissolved in 92.83 parts of water),...
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