Synthesis method of polycarboxylic acid high-performance water reducing agent of star-like structure
A technology of star structure and synthesis method, applied in the field of polycarboxylate high-performance water reducer, to achieve the effect of improving work efficiency, good application prospects and market competitiveness, and improving stability
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Embodiment 1
[0030] First, 9.11g of sorbitol was added to the reactor, the temperature was raised to 40°C, 1.8g of phenothiazine, 36.03g of acrylic acid, and 4.51g of phosphoric acid were added to the reactor in turn, and the stirring time between each addition was 20 minutes, and the temperature was raised to Add 13.54g cyclohexane at 80°C, continue to heat up to 100°C for esterification reaction, separate the water obtained during the reaction, and remove the water-carrying agent by vacuuming after 10 hours of reaction to obtain the first step of esterification Reaction product: Take 50g of methoxypolyethylene glycol (molecular weight = 2500) into the reactor, raise the temperature to 50°C, add 0.36g of phenothiazine, 7.21g of acrylic acid, and 5g of phosphoric acid into the reactor in sequence, and add each time Stir at intervals of 20 minutes, add 17.16g of toluene when the temperature rises to 80°C, continue to heat up to 105°C for esterification reaction, and separate the water obtain...
Embodiment 2
[0032] After the polycarboxylate superplasticizer with a concentration of 20% obtained in Example 1 was stored at 6°C for 20 days, its implementation effect was measured.
Embodiment 3
[0034] First, add 18.22g of mannitol into the reactor, raise the temperature to 80°C, add 0.06g of p-tert-butylcatechol, 57.65g of acrylic acid, and 1.52g of sulfamic acid to the reactor in turn, and stir for 5 minutes between each addition. When the temperature rises to 100°C, 11.38g of toluene is added, and the temperature continues to rise to 150°C for esterification reaction. During the reaction, the water obtained in the reaction is separated out. After 2 hours of reaction, the water-carrying agent is removed by vacuuming to obtain the first Step 1 esterification reaction product; take 100g of polyethylene glycol (molecular weight = 1000) into the reactor, raise the temperature to 70°C, add 0.22g of p-tert-butylcatechol, 21.6g of acrylic acid, and 2g of sulfamic acid to the reactor in turn , and the stirring time between each feeding is 5 minutes. When the temperature rises to 100°C, 12.16g cyclohexane is added, and the temperature is continued to rise to 150°C to carry ou...
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