Early-strength water reducing agent containing phosphate monomer and preparation method of early-strength water reducing agent
An early-strength, water-reducing agent technology, which is applied in the field of construction admixtures, can solve the problems of the late strength of concrete, the impact of concrete fluidity, the impact of long-term mechanical properties of concrete, durability, and poor early-strength effects, and shorten the setting time. , early strength and other effects of high age strength and high water reduction rate
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[0030] Example 1:
[0031] Preparation of unsaturated phosphate functional monomer: 50 parts by weight of 2-methallyl alcohol and 105 parts by weight of phosphorus pentoxide were added to the reaction device, the temperature was heated to 85-90 ° C, and 0.8 parts by weight of phosphorus tungsten was added. acid, and kept for 4±1h to obtain unsaturated phosphate functional monomer;
[0032] Preparation of early strength water reducing agent containing phosphate monomer:
[0033] (1) 200 parts by weight of HPEG4000 molecular weight macromonomer, 5 parts by weight of acrylamide, 1.5 parts by weight of ammonium persulfate, 270 parts by weight of deionized water are dropped into the reactor device, and stirred to obtain compound;
[0034] (2) 25 parts by weight of unsaturated phosphate functional monomer, 3 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, and 15 parts by weight of deionized water are put into the dropping device, and mixed uniformly to obtain the firs...
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[0038] Example 2:
[0039] Preparation of unsaturated phosphate functional monomer: 50 parts by weight of 2-methallyl alcohol and 105 parts by weight of phosphorus pentoxide were added to the reaction device, the temperature was heated to 85-90° C., and 1.3 parts by weight of phosphotungsten was added. acid, and kept for 4±1h to obtain unsaturated phosphate functional monomer;
[0040] Preparation of early strength water reducing agent containing phosphate monomer:
[0041] (1) 200 parts by weight of TPEG6000 molecular weight macromonomer, 8 parts by weight of acrylamide, 2.0 parts by weight of ammonium persulfate, 280 parts by weight of deionized water are dropped into the reactor device, and stirred to obtain compound;
[0042] (2) 25 parts by weight of unsaturated phosphate functional monomer, 5.5 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, and 20 parts by weight of deionized water were put into the dropping device, and mixed uniformly to obtain the first...
Example Embodiment
[0046] Example 3:
[0047] Preparation of unsaturated phosphate functional monomer: 50 parts by weight of butenol and 75 parts by weight of phosphoric acid are added to the reaction device, the temperature is heated to 85-90 ° C, 1.0 parts by weight of phosphotungstic acid is added, and the temperature is kept for 4±1h, That is, the unsaturated phosphate functional monomer is obtained;
[0048] Preparation of early strength water reducing agent containing phosphate monomer:
[0049] (1) 200 parts by weight of HPEG4000 molecular weight macromonomer, 6.5 parts by weight of acrylamide, 2.0 parts by weight of ammonium persulfate, 280 parts by weight of deionized water are dropped into the reactor device, and stirred to obtain mixture;
[0050] (2) put 30 parts by weight of unsaturated phosphate functional monomer, 3 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, and 20 parts by weight of deionized water into the dropping device, and mix them uniformly to obtain the...
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