Preparation method of water-retention anti-mud type polycarboxylate superplasticizer
A polycarboxylic acid, anti-mud type technology, applied in the field of building admixtures, can solve the problem of no anti-mud effect, etc., and achieve the effect of excellent mud resistance, high water reduction rate, and increased steric hindrance effect.
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Embodiment 1
[0024] (1) Esterification reaction: 180.00g glucose, 758.00g 2-amino-4-methyl-5-phospho-3-pentenoic acid ethyl ester, 1000.00g methoxypolyethylene glycol with a molecular weight of 1000, 15.00g Add phenothiazine and 18.00g of p-toluenesulfonic acid into the reaction kettle and mix them. Under the protection of nitrogen, react at a constant temperature of 110°C for 4.0h. During this period, remove water by vacuuming or nitrogen with water. After the reaction, the temperature drops to At room temperature, a mixture of esterified product and unreacted ethyl 2-amino-4-methyl-5-phospho-3-pentenoate is obtained;
[0025] (2) Monomer blending: 200.00g of the mixture prepared in step (1), 1.20g of ethyl 3-(2-fluorophenyl)prop-2-enoate, 12.00g of acrylic acid, 8.00g of hydroxyethyl acrylate The esters were mixed, and 100.00 g of water was added to dissolve it to obtain a comonomer mixture solution;
[0026] (3) Copolymerization reaction: the above-mentioned comonomer mixture solution,...
Embodiment 2
[0029] (1) Esterification reaction: 180.00g glucose, 731.00g 2-amino-4-methyl-5-phospho-3-pentenoic acid, 960.00g molecular weight is 800 methoxy polyethylene glycol polypropylene glycol copolymer, Add 12.00g of phenothiazine and 15.00g of ethanesulfonic acid into the reaction kettle and mix them. Under the protection of nitrogen, react at a constant temperature of 120°C for 5.0h. During this period, remove water by vacuuming or nitrogen with water. After the reaction Cool down to room temperature to obtain a mixture of esterification product and unreacted 2-amino-4-methyl-5-phospho-3-pentenoic acid;
[0030] (2) Monomer blending: Mix 200.00g of the mixture prepared in step (1), 2.00g of methyl 4-fluorocinnamate, 16.00g of maleic anhydride and 6.00g of hydroxyethyl methacrylate, and add 100.00g water to dissolve it, resulting in a comonomer mixture solution;
[0031] (3) Copolymerization reaction: the above-mentioned comonomer mixture solution, azobisisobutylamidine hydrochlo...
Embodiment 3
[0034](1) Esterification reaction: 180.00g of glucose, 752.00g of 2-amino-4-methyl-5-phosphonopent-3-enoic acid, 1440g of ethoxypolyethylene glycol with a molecular weight of 1200, 22.00g of p-phenylene Add diphenol and 20.00g of benzenesulfonic acid into the reaction kettle and mix them. Under the protection of nitrogen, react at a constant temperature of 100°C for 4.0h. During this period, use vacuum or nitrogen with water to remove water. After the reaction, cool down to room temperature. Promptly obtain the mixture of esterification product and unreacted 2-amino-4-methyl-5-phosphonopent-3-enoic acid;
[0035] (2) Monomer blending: 200.00g of the mixture prepared in step (1), 2.10g of 3-(2,4-difluorophenyl)ethyl acrylate, 18.00g of itaconic acid and 10.00g of hydroxypropyl acrylate The esters were mixed, and 100.00 g of water was added to dissolve it to obtain a comonomer mixture solution;
[0036] (3) Copolymerization reaction: the above-mentioned comonomer mixture soluti...
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