Preparation method of environment-friendly self-preservative polycarboxylate superplasticizer
A technology of rot-type polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve problems such as poor anti-corrosion effect, and achieve the effect of prolonging the shelf life and improving the anti-corrosion effect.
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[0044] Preparation of monomer C of functional guanidinium salt:
[0045] Use the code name of table 1 in the embodiment:
[0046] The monomer code number in the synthesis embodiment of table 1
[0047] code name
monomer name
code name
monomer name
D-1
D-3
Guanidine sulfamate
D-2
Aminoguanidine carbonate
D-4
[0048] 1. Add 19.6g of maleic anhydride and 50g of absolute ethanol to a 500mL glass round-bottomed flask equipped with a thermometer, agitator, dropping funnel and nitrogen gas conduit, stir and heat up to dissolve, and purge the round-bottomed flask with nitrogen to remove the system Oxygen in. Under the protection of nitrogen, the temperature was raised to 60°C, and then 28.65g of monomer D-1 and 50g of absolute ethanol were mixed and stirred to form a uniform solution, which was added dropwise to a round bottom flask at a constant speed for 3 hours. A...
Embodiment 1
[0060] Add 268g of distilled water and 220.5g of polyether macromonomer B-1 into a 1L glass round-bottom flask equipped with a thermometer, stirrer, dropping funnel, and nitrogen conduit, stir and heat up to dissolve, and purge the round-bottom flask with nitrogen to remove oxygen in the system. Under the protection of nitrogen, the temperature was raised to 90°C, and then 28.8g of monomer A-1, 2.89g of monomer C-1, 1.08g of 3-mercaptopropionic acid and 148g of water were mixed and stirred to form a homogeneous monomer aqueous solution, which was uniformly Added dropwise to a round bottom flask for 3h. At the same time, an initiator solution prepared from 172 g of distilled water and 5.03 g of potassium persulfate was added dropwise at a constant speed for 3.5 hours. After the addition of the entire solution, continue to keep the constant temperature for 3 hours, then lower the temperature to about 40°C, add sodium hydroxide to neutralize to about pH=7.0, and obtain an enviro...
Embodiment 2
[0062] Add 268g of distilled water and 220.5g of polyether macromonomer B-2 into a 1L glass round-bottom flask equipped with a thermometer, stirrer, dropping funnel, and nitrogen gas conduit, stir and heat up to dissolve, and purge the round-bottom flask with nitrogen to remove oxygen in the system. Under the protection of nitrogen, the temperature was raised to 80°C, and then 17.22g of monomer A-2, 26.01g of monomer A-4, 2.96g of monomer C-2, 1.65g of mercaptoacetic acid and 100g of water were mixed and stirred to form a uniform monomer The aqueous solution was added dropwise to the round bottom flask at a constant speed for 2.5 hours. At the same time, an aqueous initiator solution prepared by 130 g of distilled water and 1.33 g of azobisisobutylamidine hydrochloride was added dropwise at a constant speed for 3 hours. After the addition of the entire solution, continue to keep the constant temperature for 3 hours, then lower the temperature to about 40°C, add triethanolamin...
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