Preparation method of polycarboxylate water reducer containing complexing anti-mud structure
A technology of polycarboxylic acid and water reducing agent, which is applied in the field of building materials, can solve the problems that the slump retention ability cannot reach the best effect, the yield of unsaturated phosphoric acid monoester is low, and the structural by-products of the copolymerization reaction are affected, etc. The method is simple and efficient, the molecular structure is ideal, and the effect of delaying hydration
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Embodiment 1
[0035] Preparation of unsaturated phosphate monomer: 6 parts by weight of phosphorus pentoxide and 7.7 parts by weight of hydroxyethyl acrylate were reacted at 90°C for 1.5 hours, and then 1.2 parts by weight of phosphotungstic acid were added to continue the reaction for 2 hours. 20 parts by weight of deionized water continue to react at 120°C for 1 hour to obtain unsaturated phosphate monomer;
[0036] A preparation method of polycarboxylic acid water-reducing agent containing complex anti-mud structure, including the following steps:
[0037] (1) 31.6 parts by weight of isopentenol polyoxyethylene ether, 1.8 parts by weight of acrylic acid, 1.5 parts by weight of 4-bromobutene, 0.25 parts by weight of mercaptopropionic acid, and 0.2 parts by weight of azobisisobutyl Glyamidine hydrochloride is mixed uniformly and reacted at 70°C for 2 hours;
[0038] (2) Add 4.1 parts by weight of unsaturated phosphate monomer to the reaction system and react at 90°C for 5 hours to obtain a polyc...
Embodiment 2
[0040] Preparation of unsaturated phosphate monomer: 7.1 parts by weight of phosphorus oxychloride and 8.4 parts by weight of hydroxyethyl methacrylate were reacted at 90°C for 1.5 hours, and then 0.8 parts by weight of molybdosilicic acid were added to continue the reaction 2 Add 20 parts by weight of deionized water and continue the reaction at 120°C for 1 hour to obtain unsaturated phosphate monomer;
[0041] A preparation method of polycarboxylic acid water-reducing agent containing complex anti-mud structure, including the following steps:
[0042] (1) 31 parts by weight of methallyl polyoxyethylene ether, 2.3 parts by weight of methacrylic acid, 1.5 parts by weight of 3-bromobutene, 0.3 parts by weight of thioglycolic acid, 0.3 parts by weight of azobis Mix isobuimidazoline hydrochloride uniformly and react at 70°C for 2.5 hours;
[0043] (2) Add 4.9 parts by weight of unsaturated phosphate monomer to the reaction system and react at 90°C for 4 hours to obtain a polycarboxylic...
Embodiment 3
[0045] Preparation of unsaturated phosphate monomer: 5.6 parts by weight of phosphorus trichloride and 9.2 parts by weight of hydroxypropyl acrylate were reacted at 90°C for 1.5 hours, and then 0.7 parts by weight of phosphotungstic acid and 0.2 parts by weight of molybdosilicic acid were added Continue the reaction for 1 hour, add 10 parts by weight of deionized water and continue the reaction at 95°C for 2 hours to obtain an unsaturated phosphate monomer;
[0046] A preparation method of polycarboxylic acid water-reducing agent containing complex anti-mud structure, including the following steps:
[0047] (1) 34 parts by weight of allyl polyoxyethylene ether, 3.5 parts by weight of fumaric acid, 2 parts by weight of 5-bromo-1-pentene, 0.4 parts by weight of thioglycolic acid, 0.4 parts by weight of azo Dicyanovaleric acid is mixed uniformly and reacted at 70°C for 2.5 hours;
[0048] (2) Add 3.8 parts by weight of unsaturated phosphate monomer to the reaction system, and react at ...
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