Preparation method of polyester type pure solid polycarboxylic acid high-performance water reducing agent
A pure solid, polycarboxylic acid technology, applied in the field of polycarboxylate high-performance water reducers, can solve the problems of inability to fully realize solid polyester type water reducers, enrich the preparation methods of synthetic polycarboxylates, etc., and achieve good market competition force and application prospects, avoiding the reduction of separation and concentration efficiency, and reducing the effect of transportation costs
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[0022] Example 1
[0023] First, 100 g of methoxy polyethylene glycol (molecular weight 2500) was added to the reactor, and the temperature was raised to 50 °C. When the methoxy polyethylene glycol was in a liquid state, 0.07 g of hydroquinone, 0.07 g of hydroquinone, 14.41g acrylic acid, 1.5g p-toluenesulfonic acid, and stirring time for 20 minutes at each feeding interval, add 17.16g cyclohexane when the temperature rises to 80°C, continue to heat up to 105°C to carry out esterification reaction, while reacting The water obtained from the reaction was separated, and after 6 hours of reaction, the cyclohexane was removed by vacuuming to obtain the esterification reaction product; the esterification reaction product was added to the reactor, the temperature was raised to 50 ° C, and 2.76g of mercapto groups were sequentially added to the reactor. Acetic acid, 4.32g of acrylic acid, 0.48g of dibenzoyl peroxide, and the stirring time of each feeding interval is 20 minutes, conti...
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[0024] Example 2
[0025] After the cement dispersant with a mass fraction of 35% obtained in Example 1 was stored at 6°C for 30 days, its implementation effect was measured.
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[0026] Example 3
[0027] First, 50g polyethylene glycol (molecular weight 500) was added to the reactor, and the temperature was raised to 70°C. When the polyethylene glycol was in a liquid state, 0.65g phenothiazine, 12.91g methacrylic acid, 5g phenothiazine, 5g Phosphoric acid, and the stirring time is 5 minutes at each feeding interval. When the temperature is raised to 100 ° C, 18.87 g of toluene are added, and the temperature is continued to be raised to 110 ° C to carry out the esterification reaction. The toluene was removed by vacuuming to obtain the esterification reaction product; the esterification reaction product was added to the reactor, the temperature was raised to 70 ° C, and 0.53 g of mercaptopropionic acid, 4.8 g of acrylic acid, 32.67 g of maleic anhydride, 1.64g of azobisisobutyronitrile, and the stirring time was 5 minutes at each feeding interval, the temperature was continued to be raised to 75°C for bulk polymerization, the reaction was carried out fo...
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